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## com.trolltech.qt.gui
Class QGraphicsLineItem

    java.lang.Object
      com.trolltech.qt.internal.QSignalEmitterInternal
          com.trolltech.qt.QSignalEmitter
              com.trolltech.qt.QtJambiObject
                  com.trolltech.qt.gui.QGraphicsLineItem

All Implemented Interfaces:
  QGraphicsItemInterface, QtJambiInterface

    public class QGraphicsLineItem

extends QtJambiObject
implements QGraphicsItemInterface

The `QGraphicsLineItem` class provides a line item that you can add to a `QGraphicsScene`. To set the item's line, pass a `QLineF` to `QGraphicsLineItem`'s constructor, or call the `setLine()` function. The `line()` function returns the current line. By default the line is black with a width of 0, but you can change this by calling `setPen()`.

`QGraphicsLineItem` uses the line and the pen width to provide a reasonable implementation of `boundingRect()`, `shape()`, and `contains()`. The `paint()` function draws the line using the item's associated pen.

See also:
  `QGraphicsPathItem`, `QGraphicsRectItem`, `QGraphicsEllipseItem`, `QGraphicsTextItem`, `QGraphicsPolygonItem`, `QGraphicsPixmapItem`, and The Graphics View Framework.

Nested Class Summary
`static class` | `QGraphicsLineItem.enum_1`

Nested classes/interfaces inherited from class com.trolltech.qt.QSignalEmitter
`QSignalEmitter.AbstractSignal, QSignalEmitter.Signal0, QSignalEmitter.Signal1, QSignalEmitter.Signal2, QSignalEmitter.Signal3, QSignalEmitter.Signal4, QSignalEmitter.Signal5, QSignalEmitter.Signal6, QSignalEmitter.Signal7, QSignalEmitter.Signal8, QSignalEmitter.Signal9`

Nested classes/interfaces inherited from class com.trolltech.qt.internal.QSignalEmitterInternal
`com.trolltech.qt.internal.QSignalEmitterInternal.AbstractSignalInternal`

Field Summary

Fields inherited from class com.trolltech.qt.internal.QSignalEmitterInternal
`currentSender`

Constructor Summary
`QGraphicsLineItem()` Constructs a `QGraphicsLineItem`.
`QGraphicsLineItem(double x1, double y1, double x2, double y2)` This is equal to QGraphicsLineItem(new QLineF(`x1`, `y1`, 2802 `x2`, `y2`)).
`QGraphicsLineItem(double x1, double y1, double x2, double y2, QGraphicsItemInterface parent)` This is equal to QGraphicsLineItem(new QLineF(`x1`, `y1`, `x2`, `y2`), `parent`).
`QGraphicsLineItem(double x1, double y1, double x2, double y2, QGraphicsItemInterface parent, QGraphicsScene scene)` This is equal to QGraphicsLineItem(new QLineF(`x1`, `y1`, `x2`, `y2`), `parent`, `scene`).
`QGraphicsLineItem(QGraphicsItemInterface parent)` Constructs a `QGraphicsLineItem`.
`QGraphicsLineItem(QGraphicsItemInterface parent, QGraphicsScene scene)` Constructs a `QGraphicsLineItem`.
`QGraphicsLineItem(QLineF line)` Creates a new QGraphicsLineItem from `line` with no parent (null).
`QGraphicsLineItem(QLineF line, QGraphicsItemInterface parent)` Creates a new QGraphicsLineItem from `line` with the specified `parent`
`QGraphicsLineItem(QLineF line, QGraphicsItemInterface parent, QGraphicsScene scene)` Creates a new QGraphicsLineItem from `line` with the specified `parent`, and then adds it to `scene`.

Method Summary
`boolean` | `acceptDrops()` Returns true if this item can accept drag and drop events; otherwise, returns false.
`Qt.MouseButtons` | `acceptedMouseButtons()` Returns the mouse buttons that this item accepts mouse events for.
`boolean` | `acceptHoverEvents()` Returns true if an item accepts hover events (`QGraphicsSceneHoverEvent`); otherwise, returns false.
`boolean` | `acceptsHoverEvents()` Call `acceptHoverEvents()` instead.
`void` | `advance(int phase)` This virtual function is called twice for all items by the `QGraphicsScene::advance()` slot.
`QRectF` | `boundingRect()` This pure virtual function defines the outer bounds of the item as a rectangle; all painting must be restricted to inside an item's bounding rect.
`QRegion` | `boundingRegion(QTransform itemToDeviceTransform)` Returns the bounding region for this item.
`double` | `boundingRegionGranularity()` Returns the item's bounding region granularity; a value between and including 0 and 1.
`QGraphicsItem.CacheMode` | `cacheMode()` Returns the cache mode for this item.
`java.util.List` | `childItems()` Returns a list of this item's children.
`QRectF` | `childrenBoundingRect()` Returns the bounding rect of this item's descendants (i.
`void` | `clearFocus()` Takes keyboard input focus from the item.
`boolean` | `collidesWithItem(QGraphicsItemInterface other, Qt.ItemSelectionMode mode)` Returns true if this item collides with `other`; otherwise returns false.
`boolean` | `collidesWithPath(QPainterPath path, Qt.ItemSelectionMode mode)` Returns true if this item collides with `path`.
`java.util.List` | `collidingItems(Qt.ItemSelectionMode mode)` Returns a list of all items that collide with this item.
`QGraphicsItemInterface` | `commonAncestorItem(QGraphicsItemInterface other)` Returns the closest common ancestor item of this item and `other`, or 0 if either `other` is 0, or there is no common ancestor.
`boolean` | `contains(QPointF point)` Returns true if this item contains `point`, which is in local coordinates; otherwise, false is returned.
`void` | `contextMenuEvent(QGraphicsSceneContextMenuEvent event)` This event handler can be reimplemented in a subclass to process context menu events.
`QCursor` | `cursor()` Returns the current cursor shape for the item.
`java.lang.Object` | `data(int key)` Returns this item's custom data for the key `key` as a `QVariant`.
`QTransform` | `deviceTransform(QTransform viewportTransform)` Returns this item's device transformation matrix, using `viewportTransform` to map from scene to device coordinates.
`void` | `dragEnterEvent(QGraphicsSceneDragDropEvent event)` This event handler, for event `event`, can be reimplemented to receive drag enter events for this item.
`void` | `dragLeaveEvent(QGraphicsSceneDragDropEvent event)` This event handler, for event `event`, can be reimplemented to receive drag leave events for this item.
`void` | `dragMoveEvent(QGraphicsSceneDragDropEvent event)` This event handler, for event `event`, can be reimplemented to receive drag move events for this item.
`void` | `dropEvent(QGraphicsSceneDragDropEvent event)` This event handler, for event `event`, can be reimplemented to receive drop events for this item.
`void` | `ensureVisible(double x, double y, double w, double h, int xmargin, int ymargin)` This convenience function is equivalent to calling ensureVisible(`QRectF`(`x`, `y`, `w`, `h`), `xmargin`, `ymargin`):
`void` | `ensureVisible(QRectF rect, int xmargin, int ymargin)` If this item is part of a scene that is viewed by a `QGraphicsView`, this convenience function will attempt to scroll the view to ensure that `rect` is visible inside the view's viewport.
`QGraphicsItem.GraphicsItemFlags` | `flags()` Returns this item's flags.
`void` | `focusInEvent(QFocusEvent event)` This event handler, for event `event`, can be reimplemented to receive focus in events for this item.
`void` | `focusOutEvent(QFocusEvent event)` This event handler, for event `event`, can be reimplemented to receive focus out events for this item.
`void` | `grabKeyboard()` Grabs the keyboard input.
`void` | `grabMouse()` Grabs the mouse input.
`QGraphicsItemGroup` | `group()` Returns a pointer to this item's item group, or 0 if this item is not member of a group.
`boolean` | `handlesChildEvents()` Returns true if this item handles child events (i.
`boolean` | `hasCursor()` Returns true if this item has a cursor set; otherwise, false is returned.
`boolean` | `hasFocus()` Returns true if this item has keyboard input focus; otherwise, returns false.
`void` | `hide()` Hides the item.
`void` | `hoverEnterEvent(QGraphicsSceneHoverEvent event)` This event handler, for event `event`, can be reimplemented to receive hover enter events for this item.
`void` | `hoverLeaveEvent(QGraphicsSceneHoverEvent event)` This event handler, for event `event`, can be reimplemented to receive hover leave events for this item.
`void` | `hoverMoveEvent(QGraphicsSceneHoverEvent event)` This event handler, for event `event`, can be reimplemented to receive hover move events for this item.
`void` | `inputMethodEvent(QInputMethodEvent event)` This event handler, for event `event`, can be reimplemented to receive input method events for this item.
`java.lang.Object` | `inputMethodQuery(Qt.InputMethodQuery query)` This method is only relevant for input items.
`void` | `installSceneEventFilter(QGraphicsItemInterface filterItem)` Installs an event filter for this item on `filterItem`, causing all events for this item to first pass through `filterItem`'s `sceneEventFilter()` function.
`boolean` | `isAncestorOf(QGraphicsItemInterface child)` Returns true if this item is an ancestor of `child` (i.
`boolean` | `isEnabled()` Returns true if the item is enabled; otherwise, false is returned.
`boolean` | `isObscured()` Returns true if this item's bounding rect is completely obscured by the opaque shape of any of colliding items above it (i.
`boolean` | `isObscured(double x, double y, double w, double h)` This convenience function is equivalent to calling isObscured(`QRectF`(`x`, `y`, `w`, `h`)).
`boolean` | `isObscured(QRectF rect)` Returns true if `rect` is completely obscured by the opaque shape of any of colliding items above it (i.
`boolean` | `isObscuredBy(QGraphicsItemInterface item)` Returns true if this item's bounding rect is completely obscured by the opaque shape of `item`.
`boolean` | `isSelected()` Returns true if this item is selected; otherwise, false is returned.
`boolean` | `isUnderMouse()` Returns true if this item is currently under the mouse cursor in one of the views; otherwise, false is returned.
`boolean` | `isVisible()` Returns true if the item is visible; otherwise, false is returned.
`boolean` | `isVisibleTo(QGraphicsItemInterface parent)` Returns true if the item is visible to `parent`; otherwise, false is returned.
`boolean` | `isWidget()` Returns true if this item is a widget (i.
`boolean` | `isWindow()` Returns true if the item is a `QGraphicsWidget` window, otherwise returns false.
`java.lang.Object` | `itemChange(QGraphicsItem.GraphicsItemChange change, java.lang.Object value)` This virtual function is called by `QGraphicsItem` to notify custom items that some part of the item's state changes.
`void` | `keyPressEvent(QKeyEvent event)` This event handler, for event `event`, can be reimplemented to receive key press events for this item.
`void` | `keyReleaseEvent(QKeyEvent event)` This event handler, for event `event`, can be reimplemented to receive key release events for this item.
`QLineF` | `line()` Returns the item's line, or a null line if no line has been set.
`QPointF` | `mapFromItem(QGraphicsItemInterface item, double x, double y)` This convenience function is equivalent to calling mapFromItem(`item`, `QPointF`(`x`, `y`)).
`QPolygonF` | `mapFromItem(QGraphicsItemInterface item, double x, double y, double w, double h)` This convenience function is equivalent to calling mapFromItem(item, `QRectF`(`x`, `y`, `w`, `h`)).
`QPainterPath` | `mapFromItem(QGraphicsItemInterface item, QPainterPath path)` Maps the path `path`, which is in `item`'s coordinate system, to this item's coordinate system, and returns the mapped path.
`QPointF` | `mapFromItem(QGraphicsItemInterface item, QPointF point)` Maps the point `point`, which is in `item`'s coordinate system, to this item's coordinate system, and returns the mapped coordinate.
`QPolygonF` | `mapFromItem(QGraphicsItemInterface item, QPolygonF polygon)` Maps the polygon `polygon`, which is in `item`'s coordinate system, to this item's coordinate system, and returns the mapped polygon.
`QPolygonF` | `mapFromItem(QGraphicsItemInterface item, QRectF rect)` Maps the rectangle `rect`, which is in `item`'s coordinate system, to this item's coordinate system, and returns the mapped rectangle as a polygon.
`QPointF` | `mapFromParent(double x, double y)` This convenience function is equivalent to calling mapFromParent(`QPointF`(`x`, `y`)).
`QPolygonF` | `mapFromParent(double x, double y, double w, double h)` This convenience function is equivalent to calling mapFromItem(`QRectF`(`x`, `y`, `w`, `h`)).
`QPainterPath` | `mapFromParent(QPainterPath path)` Maps the path `path`, which is in this item's parent's coordinate system, to this item's coordinate system, and returns the mapped path.
`QPointF` | `mapFromParent(QPointF point)` Maps the point `point`, which is in this item's parent's coordinate system, to this item's coordinate system, and returns the mapped coordinate.
`QPolygonF` | `mapFromParent(QPolygonF polygon)` Maps the polygon `polygon`, which is in this item's parent's coordinate system, to this item's coordinate system, and returns the mapped polygon.
`QPolygonF` | `mapFromParent(QRectF rect)` Maps the rectangle `rect`, which is in this item's parent's coordinate system, to this item's coordinate system, and returns the mapped rectangle as a polygon.
`QPointF` | `mapFromScene(double x, double y)` This convenience function is equivalent to calling mapFromScene(`QPointF`(`x`, `y`)).
`QPolygonF` | `mapFromScene(double x, double y, double w, double h)` This convenience function is equivalent to calling mapFromScene(`QRectF`(`x`, `y`, `w`, `h`)).
`QPainterPath` | `mapFromScene(QPainterPath path)` Maps the path `path`, which is in this item's scene's coordinate system, to this item's coordinate system, and returns the mapped path.
`QPointF` | `mapFromScene(QPointF point)` Maps the point `point`, which is in this item's scene's coordinate system, to this item's coordinate system, and returns the mapped coordinate.
`QPolygonF` | `mapFromScene(QPolygonF polygon)` Maps the polygon `polygon`, which is in this item's scene's coordinate system, to this item's coordinate system, and returns the mapped polygon.
`QPolygonF` | `mapFromScene(QRectF rect)` Maps the rectangle `rect`, which is in this item's scene's coordinate system, to this item's coordinate system, and returns the mapped rectangle as a polygon.
`QPointF` | `mapToItem(QGraphicsItemInterface item, double x, double y)` This convenience function is equivalent to calling mapToItem(`item`, `QPointF`(`x`, `y`)).
`QPolygonF` | `mapToItem(QGraphicsItemInterface item, double x, double y, double w, double h)` This convenience function is equivalent to calling mapToItem(item, `QRectF`(`x`, `y`, `w`, `h`)).
`QPainterPath` | `mapToItem(QGraphicsItemInterface item, QPainterPath path)` Maps the path `path`, which is in this item's coordinate system, to `item`'s coordinate system, and returns the mapped path.
`QPointF` | `mapToItem(QGraphicsItemInterface item, QPointF point)` Maps the point `point`, which is in this item's coordinate system, to `item`'s coordinate system, and returns the mapped coordinate.
`QPolygonF` | `mapToItem(QGraphicsItemInterface item, QPolygonF polygon)` Maps the polygon `polygon`, which is in this item's coordinate system, to `item`'s coordinate system, and returns the mapped polygon.
`QPolygonF` | `mapToItem(QGraphicsItemInterface item, QRectF rect)` Maps the rectangle `rect`, which is in this item's coordinate system, to `item`'s coordinate system, and returns the mapped rectangle as a polygon.
`QPointF` | `mapToParent(double x, double y)` This convenience function is equivalent to calling mapToParent(`QPointF`(`x`, `y`)).
`QPolygonF` | `mapToParent(double x, double y, double w, double h)` This convenience function is equivalent to calling mapToParent(`QRectF`(`x`, `y`, `w`, `h`)).
`QPainterPath` | `mapToParent(QPainterPath path)` Maps the path `path`, which is in this item's coordinate system, to its parent's coordinate system, and returns the mapped path.
`QPointF` | `mapToParent(QPointF point)` Maps the point `point`, which is in this item's coordinate system, to its parent's coordinate system, and returns the mapped coordinate.
`QPolygonF` | `mapToParent(QPolygonF polygon)` Maps the polygon `polygon`, which is in this item's coordinate system, to its parent's coordinate system, and returns the mapped polygon.
`QPolygonF` | `mapToParent(QRectF rect)` Maps the rectangle `rect`, which is in this item's coordinate system, to its parent's coordinate system, and returns the mapped rectangle as a polygon.
`QPointF` | `mapToScene(double x, double y)` This convenience function is equivalent to calling mapToScene(`QPointF`(`x`, `y`)).
`QPolygonF` | `mapToScene(double x, double y, double w, double h)` This convenience function is equivalent to calling mapToScene(`QRectF`(`x`, `y`, `w`, `h`)).
`QPainterPath` | `mapToScene(QPainterPath path)` Maps the path `path`, which is in this item's coordinate system, to the scene's coordinate system, and returns the mapped path.
`QPointF` | `mapToScene(QPointF point)` Maps the point `point`, which is in this item's coordinate system, to the scene's coordinate system, and returns the mapped coordinate.
`QPolygonF` | `mapToScene(QPolygonF polygon)` Maps the polygon `polygon`, which is in this item's coordinate system, to the scene's coordinate system, and returns the mapped polygon.
`QPolygonF` | `mapToScene(QRectF rect)` Maps the rectangle `rect`, which is in this item's coordinate system, to the scene's coordinate system, and returns the mapped rectangle as a polygon.
`void` | `mouseDoubleClickEvent(QGraphicsSceneMouseEvent event)` This event handler, for event `event`, can be reimplemented to receive mouse doubleclick events for this item.
`void` | `mouseMoveEvent(QGraphicsSceneMouseEvent event)` This event handler, for event `event`, can be reimplemented to receive mouse move events for this item.
`void` | `mousePressEvent(QGraphicsSceneMouseEvent event)` This event handler, for event `event`, can be reimplemented to receive mouse press events for this item.
`void` | `mouseReleaseEvent(QGraphicsSceneMouseEvent event)` This event handler, for event `event`, can be reimplemented to receive mouse release events for this item.
`void` | `moveBy(double dx, double dy)` Moves the item by `dx` points horizontally, and `dy` point vertically.
`QPainterPath` | `opaqueArea()` This virtual function returns a shape representing the area where this item is opaque.
`void` | `paint(QPainter painter, QStyleOptionGraphicsItem option, QWidget widget)` This function, which is usually called by `QGraphicsView`, paints the contents of an item in local coordinates.
`QGraphicsItemInterface` | `parentItem()` Returns a pointer to this item's parent item.
`QGraphicsWidget` | `parentWidget()` Returns a pointer to the item's parent widget.
`QPen` | `pen()` Returns the item's pen, or a black solid 0-width pen if no pen has been set.
`QPointF` | `pos()` Returns the position of the item in parent coordinates.
`void` | `prepareGeometryChange()` Prepares the item for a geometry change.
`void` | `removeSceneEventFilter(QGraphicsItemInterface filterItem)` Removes an event filter on this item from `filterItem`.
`void` | `resetTransform()` Resets this item's transformation matrix to the identity matrix.
`void` | `rotate(double angle)` Rotates the current item transformation `angle` degrees clockwise around its origin.
`void` | `scale(double sx, double sy)` Scales the current item transformation by (`sx`, `sy`) around its origin.
`QGraphicsScene` | `scene()` Returns the current scene for the item, or 0 if the item is not stored in a scene.
`QRectF` | `sceneBoundingRect()` Returns the bounding rect of this item in scene coordinates, by combining `sceneTransform()` with `boundingRect()`.
`boolean` | `sceneEvent(QEvent event)` This virtual function receives events to this item.
`boolean` | `sceneEventFilter(QGraphicsItemInterface watched, QEvent event)` Filters events for the item `watched`.
`QPointF` | `scenePos()` Returns the item's position in scene coordinates.
`QTransform` | `sceneTransform()` Returns this item's scene transformation matrix.
`void` | `scroll(double dx, double dy, QRectF rect)` Scrolls the contents of `rect` by `dx`, `dy`.
`void` | `setAcceptDrops(boolean on)` If `on` is true, this item will accept drag and drop events; otherwise, it is transparent for drag and drop events.
`void` | `setAcceptedMouseButtons(Qt.MouseButtons buttons)` Sets the mouse `buttons` that this item accepts mouse events for.
`void` | `setAcceptHoverEvents(boolean enabled)` If `enabled` is true, this item will accept hover events; otherwise, it will ignore them.
`void` | `setAcceptsHoverEvents(boolean enabled)` Use setAcceptHoverEvents(`enabled`) instead.
`void` | `setBoundingRegionGranularity(double granularity)` Sets the bounding region granularity to `granularity`; a value between and including 0 and 1.
`void` | `setCacheMode(QGraphicsItem.CacheMode mode, QSize cacheSize)` Sets the item's cache mode to `mode`.
`void` | `setCursor(QCursor cursor)` Sets the current cursor shape for the item to `cursor`.
`void` | `setData(int key, java.lang.Object value)` Sets this item's custom data for the key `key` to `value`.
`void` | `setEnabled(boolean enabled)` If `enabled` is true, the item is enabled; otherwise, it is disabled.
`void` | `setFlag(QGraphicsItem.GraphicsItemFlag flag, boolean enabled)` If `enabled` is true, the item flag `flag` is enabled; otherwise, it is disabled.
`void` | `setFlags(QGraphicsItem.GraphicsItemFlags flags)` Sets the item flags to `flags`.
`void` | `setFocus(Qt.FocusReason focusReason)` Gives keyboard input focus to this item.
`void` | `setGroup(QGraphicsItemGroup group)` Adds this item to the item group `group`.
`void` | `setHandlesChildEvents(boolean enabled)` If `enabled` is true, this item is set to handle all events for all its children (i.
`void` | `setLine(double x1, double y1, double x2, double y2)` Sets the item's line to be the line between (`x1`, `y1`) and (`x2`, `y2`).
`void` | `setLine(QLineF line)` Sets the item's line to be the given `line`.
`void` | `setParentItem(QGraphicsItemInterface parent)` Sets this item's parent item to `parent`.
`void` | `setPen(QPen pen)` Sets the item's pen to `pen`.
`void` | `setPos(double x, double y)` This convenience function is equivalent to calling setPos(`QPointF`(`x`, `y`)).
`void` | `setPos(QPointF pos)` Sets the position of the item to `pos`, which is in parent coordinates.
`void` | `setSelected(boolean selected)` If `selected` is true and this item is selectable, this item is selected; otherwise, it is unselected.
`void` | `setToolTip(java.lang.String toolTip)` Sets the item's tool tip to `toolTip`.
`void` | `setTransform(QTransform matrix, boolean combine)` Sets the item's current transformation matrix to `matrix`.
`void` | `setVisible(boolean visible)` If `visible` is true, the item is made visible.
`void` | `setZValue(double z)` Sets the Z-value, or the elevation, of the item, to `z`.
`QPainterPath` | `shape()` Returns the shape of this item as a `QPainterPath` in local coordinates.
`void` | `shear(double sh, double sv)` Shears the current item transformation by (`sh`, `sv`).
`void` | `show()` Shows the item.
`java.lang.String` | `toolTip()` Returns the item's tool tip, or an empty QString if no tool tip has been set.
`QGraphicsItemInterface` | `topLevelItem()` Returns this item's top-level item.
`QGraphicsWidget` | `topLevelWidget()` Returns a pointer to the item's top level widget (i.e., the item's ancestor whose parent is 0, or whose parent is not a widget), or 0 if this item does not have a top level widget.
`QTransform` | `transform()` Returns this item's transformation matrix.
`void` | `translate(double dx, double dy)` Translates the current item transformation by (`dx`, `dy`).
`int` | `type()` Returns the type of an item as an int.
`void` | `ungrabKeyboard()` Releases the keyboard grab.
`void` | `ungrabMouse()` Releases the mouse grab.
`void` | `unsetCursor()` Clears the cursor from this item.
`void` | `update(double x, double y, double width, double height)` This convenience function is equivalent to calling update(`QRectF`(`x`, `y`, `width`, `height`)).
`void` | `update(QRectF rect)` Schedules a redraw of the area covered by `rect` in this item.
`void` | `wheelEvent(QGraphicsSceneWheelEvent event)` This event handler, for event `event`, can be reimplemented to receive wheel events for this item.
`QGraphicsWidget` | `window()` Returns the item's window, or 0 if this item does not have a window.
`double` | `x()` This convenience function is equivalent to calling `pos()`.`x()`.
`double` | `y()` This convenience function is equivalent to calling `pos()`.`y()`.
`double` | `zValue()` Returns the Z-value, or the elevation, of the item.

Methods inherited from class com.trolltech.qt.QtJambiObject
`dispose, disposed, equals, finalize, reassignNativeResources, tr, tr, tr`

Methods inherited from class com.trolltech.qt.QSignalEmitter
`blockSignals, disconnect, disconnect, signalsBlocked, signalSender, thread`

Methods inherited from class com.trolltech.qt.internal.QSignalEmitterInternal
`__qt_signalInitialization`

Methods inherited from class java.lang.Object
`clone, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Methods inherited from interface com.trolltech.qt.QtJambiInterface
`disableGarbageCollection, nativeId, nativePointer, reenableGarbageCollection, setJavaOwnership`

Constructor Detail

### QGraphicsLineItem

    public QGraphicsLineItem(QGraphicsItemInterface parent)

  Constructs a `QGraphicsLineItem`. `parent` is passed to `QGraphicsItem`'s constructor. The item is added to `scene`.

See also:
  `QGraphicsScene::addItem()`.

### QGraphicsLineItem

    public QGraphicsLineItem()

  Constructs a `QGraphicsLineItem`. `parent` is passed to `QGraphicsItem`'s constructor. The item is added to `scene`.

See also:
  `QGraphicsScene::addItem()`.

### QGraphicsLineItem

    public QGraphicsLineItem(QGraphicsItemInterface parent,
                             QGraphicsScene scene)

  Constructs a `QGraphicsLineItem`. `parent` is passed to `QGraphicsItem`'s constructor. The item is added to `scene`.

See also:
  `QGraphicsScene::addItem()`.

### QGraphicsLineItem

    public QGraphicsLineItem(QLineF line,
                             QGraphicsItemInterface parent)

  Creates a new QGraphicsLineItem from `line` with the specified `parent`

### QGraphicsLineItem

    public QGraphicsLineItem(QLineF line)

  Creates a new QGraphicsLineItem from `line` with no parent (null).

### QGraphicsLineItem

    public QGraphicsLineItem(QLineF line,
                             QGraphicsItemInterface parent,
                             QGraphicsScene scene)

  Creates a new QGraphicsLineItem from `line` with the specified `parent`, and then adds it to `scene`.

### QGraphicsLineItem

    public QGraphicsLineItem(double x1,
                             double y1,
                             double x2,
                             double y2,
                             QGraphicsItemInterface parent)

  This is equal to QGraphicsLineItem(new QLineF(`x1`, `y1`, `x2`, `y2`), `parent`).

### QGraphicsLineItem

    public QGraphicsLineItem(double x1,
                             double y1,
                             double x2,
                             double y2)

  This is equal to QGraphicsLineItem(new QLineF(`x1`, `y1`, 2802 `x2`, `y2`)).

### QGraphicsLineItem

    public QGraphicsLineItem(double x1,
                             double y1,
                             double x2,
                             double y2,
                             QGraphicsItemInterface parent,
                             QGraphicsScene scene)

  This is equal to QGraphicsLineItem(new QLineF(`x1`, `y1`, `x2`, `y2`), `parent`, `scene`).

Method Detail

### acceptDrops

    public final boolean acceptDrops()

  Returns true if this item can accept drag and drop events; otherwise, returns false. By default, items do not accept drag and drop events; items are transparent to drag and drop.

See also:
  `setAcceptDrops()`.

  Specified by:
    `acceptDrops` in interface `QGraphicsItemInterface`

### acceptHoverEvents

    public final boolean acceptHoverEvents()

  Returns true if an item accepts hover events (`QGraphicsSceneHoverEvent`); otherwise, returns false. By default, items do not accept hover events.

See also:
  `setAcceptHoverEvents()`, and `setAcceptedMouseButtons()`.

  Specified by:
    `acceptHoverEvents` in interface `QGraphicsItemInterface`

### acceptedMouseButtons

    public final Qt.MouseButtons acceptedMouseButtons()

  Returns the mouse buttons that this item accepts mouse events for. By default, all mouse buttons are accepted.

  If an item accepts a mouse button, it will become the mouse grabber item when a mouse press event is delivered for that mouse button. However, if the item does not accept the button, `QGraphicsScene` will forward the mouse events to the first item beneath it that does.

See also:
  `setAcceptedMouseButtons()`, and `mousePressEvent()`.

  Specified by:
    `acceptedMouseButtons` in interface `QGraphicsItemInterface`

### acceptsHoverEvents

    public final boolean acceptsHoverEvents()

  Call `acceptHoverEvents()` instead.

See also:
  setAcceptsHoverEvents().

  Specified by:
    `acceptsHoverEvents` in interface `QGraphicsItemInterface`

### boundingRegion

    public final QRegion boundingRegion(QTransform itemToDeviceTransform)

  Returns the bounding region for this item. The coordinate space of the returned region depends on `itemToDeviceTransform`. If you pass an identity `QTransform` as a parameter, this function will return a local coordinate region.

  The bounding region describes a coarse outline of the item's visual contents. Although it's expensive to calculate, it's also more precise than `boundingRect()`, and it can help to avoid unnecessary repainting when an item is updated. This is particularily efficient for thin items (e.g., lines or simple polygons). You can tune the granularity for the bounding region by calling `setBoundingRegionGranularity()`. The default granularity is 0; in which the item's bounding region is the same as its bounding rect.

  `itemToDeviceTransform` is the transformation from item coordinates to device coordinates. If you want this function to return a `QRegion` in scene coordinates, you can pass `sceneTransform()` as an argument.

See also:
  `boundingRegionGranularity()`.

  Specified by:
    `boundingRegion` in interface `QGraphicsItemInterface`

### boundingRegionGranularity

    public final double boundingRegionGranularity()

  Returns the item's bounding region granularity; a value between and including 0 and 1. The default value is 0 (i.e., the lowest granularity, where the bounding region corresponds to the item's bounding rectangle).

See also:
  `setBoundingRegionGranularity()`.

  Specified by:
    `boundingRegionGranularity` in interface `QGraphicsItemInterface`

### cacheMode

    public final QGraphicsItem.CacheMode cacheMode()

  Returns the cache mode for this item. The default mode is `NoCache` (i.e., cache is disabled and all painting is immediate).

See also:
  `setCacheMode()`.

  Specified by:
    `cacheMode` in interface `QGraphicsItemInterface`

### childItems

    public final java.util.List childItems()

  Returns a list of this item's children. The items are returned in no particular order.

See also:
  `setParentItem()`.

  Specified by:
    `childItems` in interface `QGraphicsItemInterface`

### childrenBoundingRect

    public final QRectF childrenBoundingRect()

  Returns the bounding rect of this item's descendants (i. ., its children, their children, etc.) in local coordinates. The rectangle will contain all descendants after they have been mapped to local coordinates. If the item has no children, this function returns an empty `QRectF`.

  This does not include this item's own bounding rect; it only returns its descendants' accumulated bounding rect. If you need to include this item's bounding rect, you can add `boundingRect()` to `childrenBoundingRect()` using QRectF::operator|().

  This function is linear in complexity; it determines the size of the returned bounding rect by iterating through all descendants.

See also:
  `boundingRect()`, and `sceneBoundingRect()`.

  Specified by:
    `childrenBoundingRect` in interface `QGraphicsItemInterface`

### clearFocus

    public final void clearFocus()

  Takes keyboard input focus from the item.

  If it has focus, a focus out event is sent to this item to tell it that it is about to lose the focus.

  Only items that set the `ItemIsFocusable` flag, or widgets that set an appropriate focus policy, can accept keyboard focus.

See also:
  `setFocus()`, and `QGraphicsWidget::focusPolicy`.

  Specified by:
    `clearFocus` in interface `QGraphicsItemInterface`

### collidingItems

    public final java.util.List collidingItems(Qt.ItemSelectionMode mode)

  Returns a list of all items that collide with this item.

  The way collisions are detected is determined by `mode`. The default value for `mode` is `Qt::IntersectsItemShape` ; All items whose shape intersects or is contained by this item's shape are returned.

See also:
  `QGraphicsScene::collidingItems()`, and `collidesWithItem()`.

  Specified by:
    `collidingItems` in interface `QGraphicsItemInterface`

### commonAncestorItem

    public final QGraphicsItemInterface commonAncestorItem(QGraphicsItemInterface other)

  Returns the closest common ancestor item of this item and `other`, or 0 if either `other` is 0, or there is no common ancestor.

See also:
  `isAncestorOf()`.

  Specified by:
    `commonAncestorItem` in interface `QGraphicsItemInterface`

### cursor

    public final QCursor cursor()

  Returns the current cursor shape for the item. The mouse cursor will assume this shape when it's over this item. See the `list of predefined cursor objects` for a range of useful shapes.

  An editor item might want to use an I-beam cursor:

             item.setCursor(new QCursor(Qt.CursorShape.IBeamCursor));

  If no cursor has been set, the parent's cursor is used.

See also:
  `setCursor()`, `hasCursor()`, `unsetCursor()`, `QWidget::cursor`, and `QApplication::overrideCursor()`.

  Specified by:
    `cursor` in interface `QGraphicsItemInterface`

### data

    public final java.lang.Object data(int key)

  Returns this item's custom data for the key `key` as a `QVariant`.

  Custom item data is useful for storing arbitrary properties in any item. Example:

              int ObjectName = 0;

              QGraphicsItemInterface item = scene.itemAt(100, 50);
              if (item.data(ObjectName).toString().length() == 0) {
                  if (item instanceof ButtonItem)
                      item.setData(ObjectName, "Button");
              }

  Qt does not use this feature for storing data; it is provided solely for the convenience of the user.

See also:
  `setData()`.

  Specified by:
    `data` in interface `QGraphicsItemInterface`

### deviceTransform

    public final QTransform deviceTransform(QTransform viewportTransform)

  Returns this item's device transformation matrix, using `viewportTransform` to map from scene to device coordinates. This matrix can be used to map coordinates and geometrical shapes from this item's local coordinate system to the viewport's (or any device's) coordinate system. To map coordinates from the viewport, you must first invert the returned matrix.

  Example:

              QGraphicsRectItem rect = new QGraphicsRectItem();
              rect.setPos(100, 100);

              rect.deviceTransform(view.viewportTransform()).map(new QPointF(0, 0));
              // returns the item's (0, 0) point in view's viewport coordinates

              rect.deviceTransform(view.viewportTransform()).inverted().map(new QPointF(100, 100));
              // returns view's viewport's (100, 100) coordinate in item coordinates

  This function is the same as combining this item's scene transform with the view's viewport transform, but it also understands the `ItemIgnoresTransformations` flag. The device transform can be used to do accurate coordinate mapping (and collision detection) for untransformable items.

See also:
  `transform()`, `setTransform()`, `scenePos()`, and The Graphics View Coordinate System.

  Specified by:
    `deviceTransform` in interface `QGraphicsItemInterface`

### ensureVisible

    public final void ensureVisible(QRectF rect,
                                    int xmargin,
                                    int ymargin)

  If this item is part of a scene that is viewed by a `QGraphicsView`, this convenience function will attempt to scroll the view to ensure that `rect` is visible inside the view's viewport. If `rect` is a null rect (the default), `QGraphicsItem` will default to the item's bounding rect. `xmargin` and `ymargin` are the number of pixels the view should use for margins.

  If the specified rect cannot be reached, the contents are scrolled to the nearest valid position.

  If this item is not viewed by a `QGraphicsView`, this function does nothing.

See also:
  `QGraphicsView::ensureVisible()`.

  Specified by:
    `ensureVisible` in interface `QGraphicsItemInterface`

### ensureVisible

    public final void ensureVisible(double x,
                                    double y,
                                    double w,
                                    double h,
                                    int xmargin,
                                    int ymargin)

  This convenience function is equivalent to calling ensureVisible(`QRectF`(`x`, `y`, `w`, `h`), `xmargin`, `ymargin`):

  Specified by:
    `ensureVisible` in interface `QGraphicsItemInterface`

### flags

    public final QGraphicsItem.GraphicsItemFlags flags()

  Returns this item's flags. The flags describe what configurable features of the item are enabled and not. For example, if the flags include `ItemIsFocusable` , the item can accept input focus.

  By default, no flags are enabled.

See also:
  `setFlags()`, and `setFlag()`.

  Specified by:
    `flags` in interface `QGraphicsItemInterface`

### grabKeyboard

    public final void grabKeyboard()

  Grabs the keyboard input.

  The item will receive all keyboard input to the scene until one of the following events occur:

  - The item becomes invisible
  - The item is removed from the scene
  - The item is deleted
  - The item calls `ungrabKeyboard()`
  - Another item calls `grabKeyboard()`; the item will regain the keyboard grab when the other item calls `ungrabKeyboard()`.
  When an item gains the keyboard grab, it receives a `QEvent::GrabKeyboard` event. When it loses the keyboard grab, it receives a `QEvent::UngrabKeyboard` event. These events can be used to detect when your item gains or loses the keyboard grab through other means than gaining input focus.

  It is almost never necessary to explicitly grab the keyboard in Qt, as Qt grabs and releases it sensibly. In particular, Qt grabs the keyboard when your item gains input focus, and releases it when your item loses input focus, or when the item is hidden.

  Note that only visible items can grab keyboard input. Calling `grabKeyboard()` on an invisible item has no effect.

  Keyboard events are not affected.

See also:
  `ungrabKeyboard()`, `grabMouse()`, and `setFocus()`.

  Specified by:
    `grabKeyboard` in interface `QGraphicsItemInterface`

### grabMouse

    public final void grabMouse()

  Grabs the mouse input.

  This item will receive all mouse events for the scene until any of the following events occurs:

  - The item becomes invisible
  - The item is removed from the scene
  - The item is deleted
  - The item call `ungrabMouse()`
  - Another item calls `grabMouse()`; the item will regain the mouse grab when the other item calls `ungrabMouse()`.
  When an item gains the mouse grab, it receives a `QEvent::GrabMouse` event. When it loses the mouse grab, it receives a `QEvent::UngrabMouse` event. These events can be used to detect when your item gains or loses the mouse grab through other means than receiving mouse button events.

  It is almost never necessary to explicitly grab the mouse in Qt, as Qt grabs and releases it sensibly. In particular, Qt grabs the mouse when you press a mouse button, and keeps the mouse grabbed until you release the last mouse button. Also, `Qt::Popup` widgets implicitly call `grabMouse()` when shown, and `ungrabMouse()` when hidden.

  Note that only visible items can grab mouse input. Calling `grabMouse()` on an invisible item has no effect.

  Keyboard events are not affected.

See also:
  `QGraphicsScene::mouseGrabberItem()`, `ungrabMouse()`, and `grabKeyboard()`.

  Specified by:
    `grabMouse` in interface `QGraphicsItemInterface`

### group

    public final QGraphicsItemGroup group()

  Returns a pointer to this item's item group, or 0 if this item is not member of a group.

See also:
  `setGroup()`, `QGraphicsItemGroup`, and `QGraphicsScene::createItemGroup()`.

  Specified by:
    `group` in interface `QGraphicsItemInterface`

### handlesChildEvents

    public final boolean handlesChildEvents()

  Returns true if this item handles child events (i. ., all events intended for any of its children are instead sent to this item); otherwise, false is returned.

  This property is useful for item groups; it allows one item to handle events on behalf of its children, as opposed to its children handling their events individually.

  The default is to return false; children handle their own events. The exception for this is if the item is a `QGraphicsItemGroup`, then it defaults to return true.

See also:
  `setHandlesChildEvents()`.

  Specified by:
    `handlesChildEvents` in interface `QGraphicsItemInterface`

### hasCursor

    public final boolean hasCursor()

  Returns true if this item has a cursor set; otherwise, false is returned.

  By default, items don't have any cursor set. `cursor()` will return a standard pointing arrow cursor.

See also:
  `unsetCursor()`.

  Specified by:
    `hasCursor` in interface `QGraphicsItemInterface`

### hasFocus

    public final boolean hasFocus()

  Returns true if this item has keyboard input focus; otherwise, returns false.

See also:
  `QGraphicsScene::focusItem()`, `setFocus()`, and `QGraphicsScene::setFocusItem()`.

  Specified by:
    `hasFocus` in interface `QGraphicsItemInterface`

### hide

    public final void hide()

  Hides the item. (Items are visible by default.)

  This convenience function is equivalent to calling `setVisible(false)`.

See also:
  `show()`, and `setVisible()`.

  Specified by:
    `hide` in interface `QGraphicsItemInterface`

### installSceneEventFilter

    public final void installSceneEventFilter(QGraphicsItemInterface filterItem)

  Installs an event filter for this item on `filterItem`, causing all events for this item to first pass through `filterItem`'s `sceneEventFilter()` function.

  To filter another item's events, install this item as an event filter for the other item. Example:

              QGraphicsScene scene = new QGraphicsScene();
              QGraphicsEllipseItem ellipse = scene.addEllipse(new QRectF(-10, -10, 20, 20));
              QGraphicsLineItem line = scene.addLine(new QLineF(-10, -10, 20, 20));

              line.installSceneEventFilter(ellipse);
              // line's events are filtered by ellipse's sceneEventFilter() function.

              ellipse.installSceneEventFilter(line);
              // ellipse's events are filtered by line's sceneEventFilter() function.

  An item can only filter events for other items in the same scene. Also, an item cannot filter its own events; instead, you can reimplement `sceneEvent()` directly.

  Items must belong to a scene for scene event filters to be installed and used.

See also:
  `removeSceneEventFilter()`, `sceneEventFilter()`, and `sceneEvent()`.

  Specified by:
    `installSceneEventFilter` in interface `QGraphicsItemInterface`

### isAncestorOf

    public final boolean isAncestorOf(QGraphicsItemInterface child)

  Returns true if this item is an ancestor of `child` (i. ., if this item is `child`'s parent, or one of `child`'s parent's ancestors).

See also:
  `parentItem()`.

  Specified by:
    `isAncestorOf` in interface `QGraphicsItemInterface`

### isEnabled

    public final boolean isEnabled()

  Returns true if the item is enabled; otherwise, false is returned.

See also:
  `setEnabled()`.

  Specified by:
    `isEnabled` in interface `QGraphicsItemInterface`

### isObscured

    public final boolean isObscured()

  Returns true if this item's bounding rect is completely obscured by the opaque shape of any of colliding items above it (i. ., with a higher Z value than this item).

  Its implementation is based on calling `isObscuredBy()`, which you can reimplement to provide a custom obscurity algorithm.

See also:
  `opaqueArea()`.

  Specified by:
    `isObscured` in interface `QGraphicsItemInterface`

### isObscured

    public final boolean isObscured(QRectF rect)

  Returns true if `rect` is completely obscured by the opaque shape of any of colliding items above it (i. ., with a higher Z value than this item).

  Unlike the default `isObscured()` function, this function does not call `isObscuredBy()`.

See also:
  `opaqueArea()`.

  Specified by:
    `isObscured` in interface `QGraphicsItemInterface`

### isObscured

    public final boolean isObscured(double x,
                                    double y,
                                    double w,
                                    double h)

  This convenience function is equivalent to calling isObscured(`QRectF`(`x`, `y`, `w`, `h`)).

  Specified by:
    `isObscured` in interface `QGraphicsItemInterface`

### isSelected

    public final boolean isSelected()

  Returns true if this item is selected; otherwise, false is returned.

  Items that are in a group inherit the group's selected state.

  Items are not selected by default.

See also:
  `setSelected()`, and `QGraphicsScene::setSelectionArea()`.

  Specified by:
    `isSelected` in interface `QGraphicsItemInterface`

### isUnderMouse

    public final boolean isUnderMouse()

  Returns true if this item is currently under the mouse cursor in one of the views; otherwise, false is returned.

See also:
  `QGraphicsScene::views()`, and `QCursor::pos()`.

  Specified by:
    `isUnderMouse` in interface `QGraphicsItemInterface`

### isVisible

    public final boolean isVisible()

  Returns true if the item is visible; otherwise, false is returned.

  Note that the item's general visibility is unrelated to whether or not it is actually being visualized by a `QGraphicsView`.

See also:
  `setVisible()`.

  Specified by:
    `isVisible` in interface `QGraphicsItemInterface`

### isVisibleTo

    public final boolean isVisibleTo(QGraphicsItemInterface parent)

  Returns true if the item is visible to `parent`; otherwise, false is returned. `parent` can be 0, in which case this function will return whether the item is visible to the scene or not.

  An item may not be visible to its ancestors even if `isVisible()` is true. If any ancestor is hidden, the item itself will be implicitly hidden, in which case this function will return false.

See also:
  `isVisible()`, and `setVisible()`.

  Specified by:
    `isVisibleTo` in interface `QGraphicsItemInterface`

### isWidget

    public final boolean isWidget()

  Returns true if this item is a widget (i. ., `QGraphicsWidget`); otherwise, returns false.

  Specified by:
    `isWidget` in interface `QGraphicsItemInterface`

### isWindow

    public final boolean isWindow()

  Returns true if the item is a `QGraphicsWidget` window, otherwise returns false.

See also:
  `QGraphicsWidget::windowFlags()`.

  Specified by:
    `isWindow` in interface `QGraphicsItemInterface`

### line

    public final QLineF line()

  Returns the item's line, or a null line if no line has been set.

See also:
  `setLine()`.

### mapFromItem

    public final QPainterPath mapFromItem(QGraphicsItemInterface item,
                                          QPainterPath path)

  Maps the path `path`, which is in `item`'s coordinate system, to this item's coordinate system, and returns the mapped path.

  If `item` is 0, this function returns the same as `mapFromScene()`.

See also:
  `mapFromParent()`, `mapFromScene()`, `mapToItem()`, and The Graphics View Coordinate System.

  Specified by:
    `mapFromItem` in interface `QGraphicsItemInterface`

### mapFromItem

    public final QPointF mapFromItem(QGraphicsItemInterface item,
                                     QPointF point)

  Maps the point `point`, which is in `item`'s coordinate system, to this item's coordinate system, and returns the mapped coordinate.

  If `item` is 0, this function returns the same as `mapFromScene()`.

See also:
  `mapFromParent()`, `mapFromScene()`, `transform()`, `mapToItem()`, and The Graphics View Coordinate System.

  Specified by:
    `mapFromItem` in interface `QGraphicsItemInterface`

### mapFromItem

    public final QPolygonF mapFromItem(QGraphicsItemInterface item,
                                       QPolygonF polygon)

  Maps the polygon `polygon`, which is in `item`'s coordinate system, to this item's coordinate system, and returns the mapped polygon.

  If `item` is 0, this function returns the same as `mapFromScene()`.

See also:
  `mapToItem()`, `mapFromParent()`, `transform()`, and The Graphics View Coordinate System.

  Specified by:
    `mapFromItem` in interface `QGraphicsItemInterface`

### mapFromItem

    public final QPolygonF mapFromItem(QGraphicsItemInterface item,
                                       QRectF rect)

  Maps the rectangle `rect`, which is in `item`'s coordinate system, to this item's coordinate system, and returns the mapped rectangle as a polygon.

  If `item` is 0, this function returns the same as `mapFromScene()`

See also:
  `mapToItem()`, `mapFromParent()`, `transform()`, and The Graphics View Coordinate System.

  Specified by:
    `mapFromItem` in interface `QGraphicsItemInterface`

### mapFromItem

    public final QPointF mapFromItem(QGraphicsItemInterface item,
                                     double x,
                                     double y)

  This convenience function is equivalent to calling mapFromItem(`item`, `QPointF`(`x`, `y`)).

  Specified by:
    `mapFromItem` in interface `QGraphicsItemInterface`

### mapFromItem

    public final QPolygonF mapFromItem(QGraphicsItemInterface item,
                                       double x,
                                       double y,
                                       double w,
                                       double h)

  This convenience function is equivalent to calling mapFromItem(item, `QRectF`(`x`, `y`, `w`, `h`)).

  Specified by:
    `mapFromItem` in interface `QGraphicsItemInterface`

### mapFromParent

    public final QPainterPath mapFromParent(QPainterPath path)

  Maps the path `path`, which is in this item's parent's coordinate system, to this item's coordinate system, and returns the mapped path.

See also:
  `mapFromScene()`, `mapFromItem()`, `mapToParent()`, and The Graphics View Coordinate System.

  Specified by:
    `mapFromParent` in interface `QGraphicsItemInterface`

### mapFromParent

    public final QPointF mapFromParent(QPointF point)

  Maps the point `point`, which is in this item's parent's coordinate system, to this item's coordinate system, and returns the mapped coordinate.

See also:
  `mapFromItem()`, `mapFromScene()`, `transform()`, `mapToParent()`, and The Graphics View Coordinate System.

  Specified by:
    `mapFromParent` in interface `QGraphicsItemInterface`

### mapFromParent

    public final QPolygonF mapFromParent(QPolygonF polygon)

  Maps the polygon `polygon`, which is in this item's parent's coordinate system, to this item's coordinate system, and returns the mapped polygon.

See also:
  `mapToParent()`, `mapToItem()`, `transform()`, and The Graphics View Coordinate System.

  Specified by:
    `mapFromParent` in interface `QGraphicsItemInterface`

### mapFromParent

    public final QPolygonF mapFromParent(QRectF rect)

  Maps the rectangle `rect`, which is in this item's parent's coordinate system, to this item's coordinate system, and returns the mapped rectangle as a polygon.

See also:
  `mapToParent()`, `mapFromItem()`, `transform()`, and The Graphics View Coordinate System.

  Specified by:
    `mapFromParent` in interface `QGraphicsItemInterface`

### mapFromParent

    public final QPointF mapFromParent(double x,
                                       double y)

  This convenience function is equivalent to calling mapFromParent(`QPointF`(`x`, `y`)).

  Specified by:
    `mapFromParent` in interface `QGraphicsItemInterface`

### mapFromParent

    public final QPolygonF mapFromParent(double x,
                                         double y,
                                         double w,
                                         double h)

  This convenience function is equivalent to calling mapFromItem(`QRectF`(`x`, `y`, `w`, `h`)).

  Specified by:
    `mapFromParent` in interface `QGraphicsItemInterface`

### mapFromScene

    public final QPainterPath mapFromScene(QPainterPath path)

  Maps the path `path`, which is in this item's scene's coordinate system, to this item's coordinate system, and returns the mapped path.

See also:
  `mapFromParent()`, `mapFromItem()`, `mapToScene()`, and The Graphics View Coordinate System.

  Specified by:
    `mapFromScene` in interface `QGraphicsItemInterface`

### mapFromScene

    public final QPointF mapFromScene(QPointF point)

  Maps the point `point`, which is in this item's scene's coordinate system, to this item's coordinate system, and returns the mapped coordinate.

See also:
  `mapFromItem()`, `mapFromParent()`, `transform()`, `mapToScene()`, and The Graphics View Coordinate System.

  Specified by:
    `mapFromScene` in interface `QGraphicsItemInterface`

### mapFromScene

    public final QPolygonF mapFromScene(QPolygonF polygon)

  Maps the polygon `polygon`, which is in this item's scene's coordinate system, to this item's coordinate system, and returns the mapped polygon.

See also:
  `mapToScene()`, `mapFromParent()`, `transform()`, and The Graphics View Coordinate System.

  Specified by:
    `mapFromScene` in interface `QGraphicsItemInterface`

### mapFromScene

    public final QPolygonF mapFromScene(QRectF rect)

  Maps the rectangle `rect`, which is in this item's scene's coordinate system, to this item's coordinate system, and returns the mapped rectangle as a polygon.

See also:
  `mapToScene()`, `mapFromItem()`, `transform()`, and The Graphics View Coordinate System.

  Specified by:
    `mapFromScene` in interface `QGraphicsItemInterface`

### mapFromScene

    public final QPointF mapFromScene(double x,
                                      double y)

  This convenience function is equivalent to calling mapFromScene(`QPointF`(`x`, `y`)).

  Specified by:
    `mapFromScene` in interface `QGraphicsItemInterface`

### mapFromScene

    public final QPolygonF mapFromScene(double x,
                                        double y,
                                        double w,
                                        double h)

  This convenience function is equivalent to calling mapFromScene(`QRectF`(`x`, `y`, `w`, `h`)).

  Specified by:
    `mapFromScene` in interface `QGraphicsItemInterface`

### mapToItem

    public final QPainterPath mapToItem(QGraphicsItemInterface item,
                                        QPainterPath path)

  Maps the path `path`, which is in this item's coordinate system, to `item`'s coordinate system, and returns the mapped path.

  If `item` is 0, this function returns the same as `mapToScene()`.

See also:
  `mapToParent()`, `mapToScene()`, `mapFromItem()`, and The Graphics View Coordinate System.

  Specified by:
    `mapToItem` in interface `QGraphicsItemInterface`

### mapToItem

    public final QPointF mapToItem(QGraphicsItemInterface item,
                                   QPointF point)

  Maps the point `point`, which is in this item's coordinate system, to `item`'s coordinate system, and returns the mapped coordinate.

  If `item` is 0, this function returns the same as `mapToScene()`.

See also:
  `mapToParent()`, `mapToScene()`, `transform()`, `mapFromItem()`, and The Graphics View Coordinate System.

  Specified by:
    `mapToItem` in interface `QGraphicsItemInterface`

### mapToItem

    public final QPolygonF mapToItem(QGraphicsItemInterface item,
                                     QPolygonF polygon)

  Maps the polygon `polygon`, which is in this item's coordinate system, to `item`'s coordinate system, and returns the mapped polygon.

  If `item` is 0, this function returns the same as `mapToScene()`.

See also:
  `mapToParent()`, `mapToScene()`, `mapFromItem()`, and The Graphics View Coordinate System.

  Specified by:
    `mapToItem` in interface `QGraphicsItemInterface`

### mapToItem

    public final QPolygonF mapToItem(QGraphicsItemInterface item,
                                     QRectF rect)

  Maps the rectangle `rect`, which is in this item's coordinate system, to `item`'s coordinate system, and returns the mapped rectangle as a polygon.

  If `item` is 0, this function returns the same as `mapToScene()`.

See also:
  `mapToParent()`, `mapToScene()`, `mapFromItem()`, and The Graphics View Coordinate System.

  Specified by:
    `mapToItem` in interface `QGraphicsItemInterface`

### mapToItem

    public final QPointF mapToItem(QGraphicsItemInterface item,
                                   double x,
                                   double y)

  This convenience function is equivalent to calling mapToItem(`item`, `QPointF`(`x`, `y`)).

  Specified by:
    `mapToItem` in interface `QGraphicsItemInterface`

### mapToItem

    public final QPolygonF mapToItem(QGraphicsItemInterface item,
                                     double x,
                                     double y,
                                     double w,
                                     double h)

  This convenience function is equivalent to calling mapToItem(item, `QRectF`(`x`, `y`, `w`, `h`)).

  Specified by:
    `mapToItem` in interface `QGraphicsItemInterface`

### mapToParent

    public final QPainterPath mapToParent(QPainterPath path)

  Maps the path `path`, which is in this item's coordinate system, to its parent's coordinate system, and returns the mapped path. If the item has no parent, `path` will be mapped to the scene's coordinate system.

See also:
  `mapToScene()`, `mapToItem()`, `mapFromParent()`, and The Graphics View Coordinate System.

  Specified by:
    `mapToParent` in interface `QGraphicsItemInterface`

### mapToParent

    public final QPointF mapToParent(QPointF point)

  Maps the point `point`, which is in this item's coordinate system, to its parent's coordinate system, and returns the mapped coordinate. If the item has no parent, `point` will be mapped to the scene's coordinate system.

See also:
  `mapToItem()`, `mapToScene()`, `transform()`, `mapFromParent()`, and The Graphics View Coordinate System.

  Specified by:
    `mapToParent` in interface `QGraphicsItemInterface`

### mapToParent

    public final QPolygonF mapToParent(QPolygonF polygon)

  Maps the polygon `polygon`, which is in this item's coordinate system, to its parent's coordinate system, and returns the mapped polygon. If the item has no parent, `polygon` will be mapped to the scene's coordinate system.

See also:
  `mapToScene()`, `mapToItem()`, `mapFromParent()`, and The Graphics View Coordinate System.

  Specified by:
    `mapToParent` in interface `QGraphicsItemInterface`

### mapToParent

    public final QPolygonF mapToParent(QRectF rect)

  Maps the rectangle `rect`, which is in this item's coordinate system, to its parent's coordinate system, and returns the mapped rectangle as a polygon. If the item has no parent, `rect` will be mapped to the scene's coordinate system.

See also:
  `mapToScene()`, `mapToItem()`, `mapFromParent()`, and The Graphics View Coordinate System.

  Specified by:
    `mapToParent` in interface `QGraphicsItemInterface`

### mapToParent

    public final QPointF mapToParent(double x,
                                     double y)

  This convenience function is equivalent to calling mapToParent(`QPointF`(`x`, `y`)).

  Specified by:
    `mapToParent` in interface `QGraphicsItemInterface`

### mapToParent

    public final QPolygonF mapToParent(double x,
                                       double y,
                                       double w,
                                       double h)

  This convenience function is equivalent to calling mapToParent(`QRectF`(`x`, `y`, `w`, `h`)).

  Specified by:
    `mapToParent` in interface `QGraphicsItemInterface`

### mapToScene

    public final QPainterPath mapToScene(QPainterPath path)

  Maps the path `path`, which is in this item's coordinate system, to the scene's coordinate system, and returns the mapped path.

See also:
  `mapToParent()`, `mapToItem()`, `mapFromScene()`, and The Graphics View Coordinate System.

  Specified by:
    `mapToScene` in interface `QGraphicsItemInterface`

### mapToScene

    public final QPointF mapToScene(QPointF point)

  Maps the point `point`, which is in this item's coordinate system, to the scene's coordinate system, and returns the mapped coordinate.

See also:
  `mapToItem()`, `mapToParent()`, `transform()`, `mapFromScene()`, and The Graphics View Coordinate System.

  Specified by:
    `mapToScene` in interface `QGraphicsItemInterface`

### mapToScene

    public final QPolygonF mapToScene(QPolygonF polygon)

  Maps the polygon `polygon`, which is in this item's coordinate system, to the scene's coordinate system, and returns the mapped polygon.

See also:
  `mapToParent()`, `mapToItem()`, `mapFromScene()`, and The Graphics View Coordinate System.

  Specified by:
    `mapToScene` in interface `QGraphicsItemInterface`

### mapToScene

    public final QPolygonF mapToScene(QRectF rect)

  Maps the rectangle `rect`, which is in this item's coordinate system, to the scene's coordinate system, and returns the mapped rectangle as a polygon.

See also:
  `mapToParent()`, `mapToItem()`, `mapFromScene()`, and The Graphics View Coordinate System.

  Specified by:
    `mapToScene` in interface `QGraphicsItemInterface`

### mapToScene

    public final QPointF mapToScene(double x,
                                    double y)

  This convenience function is equivalent to calling mapToScene(`QPointF`(`x`, `y`)).

  Specified by:
    `mapToScene` in interface `QGraphicsItemInterface`

### mapToScene

    public final QPolygonF mapToScene(double x,
                                      double y,
                                      double w,
                                      double h)

  This convenience function is equivalent to calling mapToScene(`QRectF`(`x`, `y`, `w`, `h`)).

  Specified by:
    `mapToScene` in interface `QGraphicsItemInterface`

### moveBy

    public final void moveBy(double dx,
                             double dy)

  Moves the item by `dx` points horizontally, and `dy` point vertically. This function is equivalent to calling setPos(`pos()` + `QPointF`(`dx`, `dy`)).

  Specified by:
    `moveBy` in interface `QGraphicsItemInterface`

### parentItem

    public final QGraphicsItemInterface parentItem()

  Returns a pointer to this item's parent item. If this item does not have a parent, 0 is returned.

See also:
  `setParentItem()`, and children().

  Specified by:
    `parentItem` in interface `QGraphicsItemInterface`

### parentWidget

    public final QGraphicsWidget parentWidget()

  Returns a pointer to the item's parent widget. The item's parent widget is the closest parent item that is a widget.

See also:
  `parentItem()`, and `childItems()`.

  Specified by:
    `parentWidget` in interface `QGraphicsItemInterface`

### pen

    public final QPen pen()

  Returns the item's pen, or a black solid 0-width pen if no pen has been set.

See also:
  `setPen()`.

### pos

    public final QPointF pos()

  Returns the position of the item in parent coordinates. If the item has no parent, its position is given in scene coordinates.

  The position of the item describes its origin (local coordinate (0, 0)) in parent coordinates; this function returns the same as mapToParent(0, 0).

  For convenience, you can also call `scenePos()` to determine the item's position in scene coordinates, regardless of its parent.

See also:
  `x()`, `y()`, `setPos()`, matrix(), and The Graphics View Coordinate System.

  Specified by:
    `pos` in interface `QGraphicsItemInterface`

### prepareGeometryChange

    public final void prepareGeometryChange()

  Prepares the item for a geometry change. Call this function before changing the bounding rect of an item to keep `QGraphicsScene`'s index up to date.

  `prepareGeometryChange()` will call `update()` if this is necessary.

  Example:

              public class CircleItem extends QGraphicsItem {

                  // ...
                  public void setRadius(double newRadius)
                  {
                      if (radius != newRadius) {
                          prepareGeometryChange();
                          radius = newRadius;
                      }
                  }
              }

See also:
  `boundingRect()`.

  Specified by:
    `prepareGeometryChange` in interface `QGraphicsItemInterface`

### removeSceneEventFilter

    public final void removeSceneEventFilter(QGraphicsItemInterface filterItem)

  Removes an event filter on this item from `filterItem`.

See also:
  `installSceneEventFilter()`.

  Specified by:
    `removeSceneEventFilter` in interface `QGraphicsItemInterface`

### resetTransform

    public final void resetTransform()

  Resets this item's transformation matrix to the identity matrix. This is equivalent to calling `setTransform(QTransform())`.

See also:
  `setTransform()`, and `transform()`.

  Specified by:
    `resetTransform` in interface `QGraphicsItemInterface`

### rotate

    public final void rotate(double angle)

  Rotates the current item transformation `angle` degrees clockwise around its origin. To translate around an arbitrary point (x, y), you need to combine translation and rotation with `setTransform()`.

  Example:

              // Rotate an item 45 degrees around (0, 0).
              item.rotate(45);

              // Rotate an item 45 degrees around (x, y).
              item.setTransform(new QTransform().translate(x, y).rotate(45).translate(-x, -y));

See also:
  `setTransform()`, `transform()`, `scale()`, `shear()`, and `translate()`.

  Specified by:
    `rotate` in interface `QGraphicsItemInterface`

### scale

    public final void scale(double sx,
                            double sy)

  Scales the current item transformation by (`sx`, `sy`) around its origin. To scale from an arbitrary point (x, y), you need to combine translation and scaling with `setTransform()`.

  Example:

              // Scale an item by 3x2 from its origin
              item.scale(3, 2);

              // Scale an item by 3x2 from (x, y)
              item.setTransform(new QTransform().translate(x, y).scale(3, 2).translate(-x, -y));

See also:
  `setTransform()`, `transform()`, `rotate()`, `shear()`, and `translate()`.

  Specified by:
    `scale` in interface `QGraphicsItemInterface`

### scene

    public final QGraphicsScene scene()

  Returns the current scene for the item, or 0 if the item is not stored in a scene.

  To add or move an item to a scene, call `QGraphicsScene::addItem()`.

  Specified by:
    `scene` in interface `QGraphicsItemInterface`

### sceneBoundingRect

    public final QRectF sceneBoundingRect()

  Returns the bounding rect of this item in scene coordinates, by combining `sceneTransform()` with `boundingRect()`.

See also:
  `boundingRect()`, and The Graphics View Coordinate System.

  Specified by:
    `sceneBoundingRect` in interface `QGraphicsItemInterface`

### scenePos

    public final QPointF scenePos()

  Returns the item's position in scene coordinates. This is equivalent to calling `mapToScene(0, 0)`.

See also:
  `pos()`, `sceneTransform()`, and The Graphics View Coordinate System.

  Specified by:
    `scenePos` in interface `QGraphicsItemInterface`

### sceneTransform

    public final QTransform sceneTransform()

  Returns this item's scene transformation matrix. This matrix can be used to map coordinates and geometrical shapes from this item's local coordinate system to the scene's coordinate system. To map coordinates from the scene, you must first invert the returned matrix.

  Example:

              QGraphicsRectItem rect = new QGraphicsRectItem();
              rect.setPos(100, 100);

              rect.sceneTransform().map(new QPointF(0, 0));
              // returns QPointF(100, 100);

              rect.sceneTransform().inverted().map(new QPointF(100, 100));
              // returns QPointF(0, 0);

  Unlike `transform()`, which returns only an item's local transformation, this function includes the item's (and any parents') position.

See also:
  `transform()`, `setTransform()`, `scenePos()`, and The Graphics View Coordinate System.

  Specified by:
    `sceneTransform` in interface `QGraphicsItemInterface`

### scroll

    public final void scroll(double dx,
                             double dy,
                             QRectF rect)

  Scrolls the contents of `rect` by `dx`, `dy`. If `rect` is a null rect (the default), the item's bounding rect is scrolled.

  Scrolling provides a fast alternative to simply redrawing when the contents of the item (or parts of the item) are shifted vertically or horizontally. Depending on the current transformation and the capabilities of the paint device (i.e., the viewport), this operation may consist of simply moving pixels from one location to another using memmove(). In most cases this is faster than rerendering the entire area.

  After scrolling, the item will issue an update for the newly exposed areas. If scrolling is not supported (e.g., you are rendering to an OpenGL viewport, which does not benefit from scroll optimizations), this function is equivalent to calling update(`rect`).

See also:
  `boundingRect()`.

  Specified by:
    `scroll` in interface `QGraphicsItemInterface`

### setAcceptDrops

    public final void setAcceptDrops(boolean on)

  If `on` is true, this item will accept drag and drop events; otherwise, it is transparent for drag and drop events. By default, items do not accept drag and drop events.

See also:
  `acceptDrops()`.

  Specified by:
    `setAcceptDrops` in interface `QGraphicsItemInterface`

### setAcceptHoverEvents

    public final void setAcceptHoverEvents(boolean enabled)

  If `enabled` is true, this item will accept hover events; otherwise, it will ignore them. By default, items do not accept hover events.

  Hover events are delivered when there is no current mouse grabber item. They are sent when the mouse cursor enters an item, when it moves around inside the item, and when the cursor leaves an item. Hover events are commonly used to highlight an item when it's entered, and for tracking the mouse cursor as it hovers over the item (equivalent to `QWidget::mouseTracking`).

  Parent items receive hover enter events before their children, and leave events after their children. The parent does not receive a hover leave event if the cursor enters a child, though; the parent stays "hovered" until the cursor leaves its area, including its children's areas.

  If a parent item handles child events (`setHandlesChildEvents()`), it will receive hover move, drag move, and drop events as the cursor passes through its children, but it does not receive hover enter and hover leave, nor drag enter and drag leave events on behalf of its children.

  A `QGraphicsWidget` with window decorations will accept hover events regardless of the value of `acceptHoverEvents()`.

See also:
  `acceptHoverEvents()`, `hoverEnterEvent()`, `hoverMoveEvent()`, and `hoverLeaveEvent()`.

  Specified by:
    `setAcceptHoverEvents` in interface `QGraphicsItemInterface`

### setAcceptedMouseButtons

    public final void setAcceptedMouseButtons(Qt.MouseButtons buttons)

  Sets the mouse `buttons` that this item accepts mouse events for.

  By default, all mouse buttons are accepted. If an item accepts a mouse button, it will become the mouse grabber item when a mouse press event is delivered for that button. However, if the item does not accept the mouse button, `QGraphicsScene` will forward the mouse events to the first item beneath it that does.

  To disable mouse events for an item (i.e., make it transparent for mouse events), call setAcceptedMouseButtons(0).

See also:
  `acceptedMouseButtons()`, and `mousePressEvent()`.

  Specified by:
    `setAcceptedMouseButtons` in interface `QGraphicsItemInterface`

### setAcceptsHoverEvents

    public final void setAcceptsHoverEvents(boolean enabled)

  Use setAcceptHoverEvents(`enabled`) instead.

See also:
  acceptsHoverEvents().

  Specified by:
    `setAcceptsHoverEvents` in interface `QGraphicsItemInterface`

### setBoundingRegionGranularity

    public final void setBoundingRegionGranularity(double granularity)

  Sets the bounding region granularity to `granularity`; a value between and including 0 and 1. The default value is 0 (i.e., the lowest granularity, where the bounding region corresponds to the item's bounding rectangle).

  The granularity is used by `boundingRegion()` to calculate how fine the bounding region of the item should be. The highest achievable granularity is 1, where `boundingRegion()` will return the finest outline possible for the respective device (e.g., for a `QGraphicsView` viewport, this gives you a pixel-perfect bounding region). The lowest possible granularity is 0. The value of `granularity` describes the ratio between device resolution and the resolution of the bounding region (e.g., a value of 0.25 will provide a region where each chunk corresponds to 4x4 device units / pixels).

See also:
  `boundingRegionGranularity()`.

  Specified by:
    `setBoundingRegionGranularity` in interface `QGraphicsItemInterface`

### setCacheMode

    public final void setCacheMode(QGraphicsItem.CacheMode mode,
                                   QSize cacheSize)

  Sets the item's cache mode to `mode`.

  The optional `logicalCacheSize` argument is used only by `ItemCoordinateCache` mode, and describes the resolution of the cache buffer; if `logicalCacheSize` is (100, 100), `QGraphicsItem` will fit the item into 100x100 pixels in graphics memory, regardless of the logical size of the item itself. By default `QGraphicsItem` uses the size of `boundingRect()`. For all other cache modes than `ItemCoordinateCache` , `logicalCacheSize` is ignored.

  Caching can speed up rendering if your item spends a significant time redrawing itself. In some cases the cache can also slow down rendering, in particular when the item spends less time redrawing than `QGraphicsItem` spends redrawing from the cache. When enabled, the item's `paint()` function will be called only once for each call to `update()`; for any subsequent repaint requests, the Graphics View framework will redraw from the cache. This approach works particularly well with `QGLWidget`, which stores all the cache as OpenGL textures.

  Be aware that `QPixmapCache`'s cache limit may need to be changed to obtain optimal performance.

  You can read more about the different cache modes in the `CacheMode` documentation.

See also:
  `cacheMode()`, `CacheMode` , and `QPixmapCache::setCacheLimit()`.

  Specified by:
    `setCacheMode` in interface `QGraphicsItemInterface`

### setCursor

    public final void setCursor(QCursor cursor)

  Sets the current cursor shape for the item to `cursor`. The mouse cursor will assume this shape when it's over this item. See the `list of predefined cursor objects` for a range of useful shapes.

  An editor item might want to use an I-beam cursor:

             item.setCursor(new QCursor(Qt.CursorShape.IBeamCursor));

  If no cursor has been set, the cursor of the item beneath is used.

See also:
  `cursor()`, `hasCursor()`, `unsetCursor()`, `QWidget::cursor`, and `QApplication::overrideCursor()`.

  Specified by:
    `setCursor` in interface `QGraphicsItemInterface`

### setData

    public final void setData(int key,
                              java.lang.Object value)

  Sets this item's custom data for the key `key` to `value`.

  Custom item data is useful for storing arbitrary properties for any item. Qt does not use this feature for storing data; it is provided solely for the convenience of the user.

See also:
  `data()`.

  Specified by:
    `setData` in interface `QGraphicsItemInterface`

### setEnabled

    public final void setEnabled(boolean enabled)

  If `enabled` is true, the item is enabled; otherwise, it is disabled.

  Disabled items are visible, but they do not receive any events, and cannot take focus nor be selected. Mouse events are discarded; they are not propagated unless the item is also invisible, or if it does not accept mouse events (see `acceptedMouseButtons()`). A disabled item cannot become the mouse grabber, and as a result of this, an item loses the grab if it becomes disabled when grabbing the mouse, just like it loses focus if it had focus when it was disabled.

  Disabled items are traditionally drawn using grayed-out colors (see `QPalette::Disabled` ).

  If you disable a parent item, all its children will also be disabled. If you enable a parent item, all children will be enabled, unless they have been explicitly disabled (i.e., if you call setEnabled(false) on a child, it will not be reenabled if its parent is disabled, and then enabled again).

  Items are enabled by default.

  Note: If you install an event filter, you can still intercept events before they are delivered to items; this mechanism disregards the item's enabled state.

See also:
  `isEnabled()`.

  Specified by:
    `setEnabled` in interface `QGraphicsItemInterface`

### setFlag

    public final void setFlag(QGraphicsItem.GraphicsItemFlag flag,
                              boolean enabled)

  If `enabled` is true, the item flag `flag` is enabled; otherwise, it is disabled.

See also:
  `flags()`, and `setFlags()`.

  Specified by:
    `setFlag` in interface `QGraphicsItemInterface`

### setFlags

    public final void setFlags(QGraphicsItem.GraphicsItemFlags flags)

  Sets the item flags to `flags`. All flags in `flags` are enabled; all flags not in `flags` are disabled.

  If the item had focus and `flags` does not enable `ItemIsFocusable` , the item loses focus as a result of calling this function. Similarly, if the item was selected, and `flags` does not enabled `ItemIsSelectable` , the item is automatically unselected.

  By default, no flags are enabled.

See also:
  `flags()`, and `setFlag()`.

  Specified by:
    `setFlags` in interface `QGraphicsItemInterface`

### setFocus

    public final void setFocus(Qt.FocusReason focusReason)

  Gives keyboard input focus to this item. The `focusReason` argument will be passed into any focus event generated by this function; it is used to give an explanation of what caused the item to get focus.

  Only items that set the `ItemIsFocusable` flag can accept keyboard focus.

  If this item is not visible (i.e., `isVisible()` returns false), not enabled, not associated with a scene, or if it already has input focus, this function will do nothing.

  As a result of calling this function, this item will receive a focus in event with `focusReason`. If another item already has focus, that item will first receive a focus out event indicating that it has lost input focus.

See also:
  `clearFocus()`, and `hasFocus()`.

  Specified by:
    `setFocus` in interface `QGraphicsItemInterface`

### setGroup

    public final void setGroup(QGraphicsItemGroup group)

  Adds this item to the item group `group`. If `group` is 0, this item is removed from any current group and added as a child of the previous group's parent.

See also:
  `group()`, and `QGraphicsScene::createItemGroup()`.

  Specified by:
    `setGroup` in interface `QGraphicsItemInterface`

### setHandlesChildEvents

    public final void setHandlesChildEvents(boolean enabled)

  If `enabled` is true, this item is set to handle all events for all its children (i. ., all events intented for any of its children are instead sent to this item); otherwise, if `enabled` is false, this item will only handle its own events. The default value is false.

  This property is useful for item groups; it allows one item to handle events on behalf of its children, as opposed to its children handling their events individually.

  If a child item accepts hover events, its parent will receive hover move events as the cursor passes through the child, but it does not receive hover enter and hover leave events on behalf of its child.

See also:
  `handlesChildEvents()`.

  Specified by:
    `setHandlesChildEvents` in interface `QGraphicsItemInterface`

### setLine

    public final void setLine(QLineF line)

  Sets the item's line to be the given `line`.

See also:
  `line()`.

### setLine

    public final void setLine(double x1,
                              double y1,
                              double x2,
                              double y2)

  Sets the item's line to be the line between (`x1`, `y1`) and (`x2`, `y2`).

  This is the same as calling `setLine(QLineF(x1, y1, x2, y2))`.

### setParentItem

    public final void setParentItem(QGraphicsItemInterface parent)

  Sets this item's parent item to `parent`. If this item already has a parent, it is first removed from the previous parent. If `parent` is 0, this item will become a top-level item.

See also:
  `parentItem()`, and children().

  Specified by:
    `setParentItem` in interface `QGraphicsItemInterface`

### setPen

    public final void setPen(QPen pen)

  Sets the item's pen to `pen`. If no pen is set, the line will be painted using a black solid 0-width pen.

See also:
  `pen()`.

### setPos

    public final void setPos(QPointF pos)

  Sets the position of the item to `pos`, which is in parent coordinates. For items with no parent, `pos` is in scene coordinates.

  The position of the item describes its origin (local coordinate (0, 0)) in parent coordinates.

See also:
  `pos()`, `scenePos()`, and The Graphics View Coordinate System.

  Specified by:
    `setPos` in interface `QGraphicsItemInterface`

### setPos

    public final void setPos(double x,
                             double y)

  This convenience function is equivalent to calling setPos(`QPointF`(`x`, `y`)).

  Specified by:
    `setPos` in interface `QGraphicsItemInterface`

### setSelected

    public final void setSelected(boolean selected)

  If `selected` is true and this item is selectable, this item is selected; otherwise, it is unselected.

  If the item is in a group, the whole group's selected state is toggled by this function. If the group is selected, all items in the group are also selected, and if the group is not selected, no item in the group is selected.

  Only visible, enabled, selectable items can be selected. If `selected` is true and this item is either invisible or disabled or unselectable, this function does nothing.

  By default, items cannot be selected. To enable selection, set the `ItemIsSelectable` flag.

  This function is provided for convenience, allowing individual toggling of the selected state of an item. However, a more common way of selecting items is to call `QGraphicsScene::setSelectionArea()`, which will call this function for all visible, enabled, and selectable items within a specified area on the scene.

See also:
  `isSelected()`, and `QGraphicsScene::selectedItems()`.

  Specified by:
    `setSelected` in interface `QGraphicsItemInterface`

### setToolTip

    public final void setToolTip(java.lang.String toolTip)

  Sets the item's tool tip to `toolTip`. If `toolTip` is empty, the item's tool tip is cleared.

See also:
  `toolTip()`, and `QToolTip`.

  Specified by:
    `setToolTip` in interface `QGraphicsItemInterface`

### setTransform

    public final void setTransform(QTransform matrix,
                                   boolean combine)

  Sets the item's current transformation matrix to `matrix`.

  If `combine` is true, then `matrix` is combined with the current matrix; otherwise, `matrix`replaces the current matrix. `combine` is false by default.

  To simplify interation with items using a transformed view, `QGraphicsItem` provides mapTo... and mapFrom... functions that can translate between items' and the scene's coordinates. For example, you can call `mapToScene()` to map an item coordiate to a scene coordinate, or `mapFromScene()` to map from scene coordinates to item coordinates.

See also:
  `transform()`, `rotate()`, `scale()`, `shear()`, `translate()`, and The Graphics View Coordinate System.

  Specified by:
    `setTransform` in interface `QGraphicsItemInterface`

### setVisible

    public final void setVisible(boolean visible)

  If `visible` is true, the item is made visible. Otherwise, the item is made invisible. Invisible items are not painted, nor do they receive any events. In particular, mouse events pass right through invisible items, and are delivered to any item that may be behind. Invisible items are also unselectable, they cannot take input focus, and are not detected by `QGraphicsScene`'s item location functions.

  If an item becomes invisible while grabbing the mouse, (i.e., while it is receiving mouse events,) it will automatically lose the mouse grab, and the grab is not regained by making the item visible again; it must receive a new mouse press to regain the mouse grab.

  Similarly, an invisible item cannot have focus, so if the item has focus when it becomes invisible, it will lose focus, and the focus is not regained by simply making the item visible again.

  If you hide a parent item, all its children will also be hidden. If you show a parent item, all children will be shown, unless they have been explicitly hidden (i.e., if you call setVisible(false) on a child, it will not be reshown even if its parent is hidden, and then shown again).

  Items are visible by default; it is unnecessary to call `setVisible()` on a new item.

See also:
  `isVisible()`, `show()`, and `hide()`.

  Specified by:
    `setVisible` in interface `QGraphicsItemInterface`

### setZValue

    public final void setZValue(double z)

  Sets the Z-value, or the elevation, of the item, to `z`. The elevation decides the stacking order of sibling (neighboring) items. An item of high Z-value will be drawn on top of an item with a lower Z-value if they share the same parent item. In addition, children of an item will always be drawn on top of the parent, regardless of the child's Z-value. Sibling items that share the same Z-value will be drawn in an undefined order, although the order will stay the same for as long as the items live.
  Children of different parents are stacked according to the Z-value of each item's ancestor item which is an immediate child of the two items' closest common ancestor. For example, a robot item might define a torso item as the parent of a head item, two arm items, and two upper-leg items. The upper-leg items would each be parents of one lower-leg item, and each lower-leg item would be parents of one foot item. The stacking order of the feet is the same as the stacking order of each foot's ancestor that is an immediate child of the two feet's common ancestor (i.e., the torso item); so the feet are stacked in the same order as the upper-leg items, regardless of each foot's Z-value.

  The Z-value does not affect the item's size in any way.

  The default Z-value is 0.

See also:
  `zValue()`.

  Specified by:
    `setZValue` in interface `QGraphicsItemInterface`

### shear

    public final void shear(double sh,
                            double sv)

  Shears the current item transformation by (`sh`, `sv`).

See also:
  `setTransform()`, `transform()`, `rotate()`, `scale()`, and `translate()`.

  Specified by:
    `shear` in interface `QGraphicsItemInterface`

### show

    public final void show()

  Shows the item. (Items are visible by default.)

  This convenience function is equivalent to calling `setVisible(true)`.

See also:
  `hide()`, and `setVisible()`.

  Specified by:
    `show` in interface `QGraphicsItemInterface`

### toolTip

    public final java.lang.String toolTip()

  Returns the item's tool tip, or an empty QString if no tool tip has been set.

See also:
  `setToolTip()`, and `QToolTip`.

  Specified by:
    `toolTip` in interface `QGraphicsItemInterface`

### topLevelItem

    public final QGraphicsItemInterface topLevelItem()

  Returns this item's top-level item. The top-level item is the item's topmost ancestor item whose parent is 0. If an item has no parent, its own pointer is returned (i.e., a top-level item is its own top-level item).

See also:
  `parentItem()`.

  Specified by:
    `topLevelItem` in interface `QGraphicsItemInterface`

### topLevelWidget

    public final QGraphicsWidget topLevelWidget()

  Returns a pointer to the item's top level widget (i.e., the item's ancestor whose parent is 0, or whose parent is not a widget), or 0 if this item does not have a top level widget. If the item is its own top level widget, this function returns a pointer to the item itself.

  Specified by:
    `topLevelWidget` in interface `QGraphicsItemInterface`

### transform

    public final QTransform transform()

  Returns this item's transformation matrix. If no matrix has been set, the identity matrix is returned.

See also:
  `setTransform()`, and `sceneTransform()`.

  Specified by:
    `transform` in interface `QGraphicsItemInterface`

### translate

    public final void translate(double dx,
                                double dy)

  Translates the current item transformation by (`dx`, `dy`).

  If all you want is to move an item, you should call `moveBy()` or `setPos()` instead; this function changes the item's translation, which is conceptually separate from its position.

See also:
  `setTransform()`, `transform()`, `rotate()`, `scale()`, and `shear()`.

  Specified by:
    `translate` in interface `QGraphicsItemInterface`

### ungrabKeyboard

    public final void ungrabKeyboard()

  Releases the keyboard grab.

See also:
  `grabKeyboard()`, and `ungrabMouse()`.

  Specified by:
    `ungrabKeyboard` in interface `QGraphicsItemInterface`

### ungrabMouse

    public final void ungrabMouse()

  Releases the mouse grab.

See also:
  `grabMouse()`, and `ungrabKeyboard()`.

  Specified by:
    `ungrabMouse` in interface `QGraphicsItemInterface`

### unsetCursor

    public final void unsetCursor()

  Clears the cursor from this item.

See also:
  `hasCursor()`, and `setCursor()`.

  Specified by:
    `unsetCursor` in interface `QGraphicsItemInterface`

### update

    public final void update(QRectF rect)

  Schedules a redraw of the area covered by `rect` in this item. You can call this function whenever your item needs to be redrawn, such as if it changes appearance or size.

  This function does not cause an immediate paint; instead it schedules a paint request that is processed by `QGraphicsView` after control reaches the event loop. The item will only be redrawn if it is visible in any associated view.

  As a side effect of the item being repainted, other items that overlap the area `rect` may also be repainted.

  If the item is invisible (i.e., `isVisible()` returns false), this function does nothing.

See also:
  `paint()`, and `boundingRect()`.

  Specified by:
    `update` in interface `QGraphicsItemInterface`

### update

    public final void update(double x,
                             double y,
                             double width,
                             double height)

  This convenience function is equivalent to calling update(`QRectF`(`x`, `y`, `width`, `height`)).

  Specified by:
    `update` in interface `QGraphicsItemInterface`

### window

    public final QGraphicsWidget window()

  Returns the item's window, or 0 if this item does not have a window. If the item is a window, it will return itself. Otherwise it will return the closest ancestor that is a window.

See also:
  `QGraphicsWidget::isWindow()`.

  Specified by:
    `window` in interface `QGraphicsItemInterface`

### x

    public final double x()

  This convenience function is equivalent to calling `pos()`.`x()`.

See also:
  `y()`.

  Specified by:
    `x` in interface `QGraphicsItemInterface`

### y

    public final double y()

  This convenience function is equivalent to calling `pos()`.`y()`.

See also:
  `x()`.

  Specified by:
    `y` in interface `QGraphicsItemInterface`

### zValue

    public final double zValue()

  Returns the Z-value, or the elevation, of the item. The Z-value decides the stacking order of sibling (neighboring) items.

  The default Z-value is 0.

See also:
  `setZValue()`.

  Specified by:
    `zValue` in interface `QGraphicsItemInterface`

### advance

    public void advance(int phase)

  This virtual function is called twice for all items by the `QGraphicsScene::advance()` slot. In the first phase, all items are called with `phase` == 0, indicating that items on the scene are about to advance, and then all items are called with `phase` == 1. Reimplement this function to update your item if you need simple scene-controlled animation.

  The default implementation does nothing.

  For individual item animation, an alternative to this function is to either use `QGraphicsItemAnimation`, or to multiple-inherit from `QObject` and `QGraphicsItem`, and animate your item using `QObject::startTimer()` and `QObject::timerEvent()`.

See also:
  `QGraphicsItemAnimation`, and `QTimeLine`.

  Specified by:
    `advance` in interface `QGraphicsItemInterface`

### boundingRect

    public QRectF boundingRect()

  This pure virtual function defines the outer bounds of the item as a rectangle; all painting must be restricted to inside an item's bounding rect. `QGraphicsView` uses this to determine whether the item requires redrawing.

  Although the item's shape can be arbitrary, the bounding rect is always rectangular, and it is unaffected by the items' transformation (`scale()`, `rotate()`, etc.).

  If you want to change the item's bounding rectangle, you must first call `prepareGeometryChange()`. This notifies the scene of the imminent change, so that its can update its item geometry index; otherwise, the scene will be unaware of the item's new geometry, and the results are undefined (typically, rendering artifacts are left around in the view).

  Reimplement this function to let `QGraphicsView` determine what parts of the widget, if any, need to be redrawn.

  Note: For shapes that paint an outline / stroke, it is important to include half the pen width in the bounding rect. It is not necessary to compensate for antialiasing, though.

  Example:

          public class CircleItem extends QGraphicsItem
          {
              // ...
              public QRectF boundingRect() {
                  double penWidth = 1;
                  return new QRectF(-radius - penWidth / 2, -radius - penWidth / 2,
                                diameter + penWidth, diameter + penWidth);
              }
            // ...
          }

See also:
  `boundingRegion()`, `shape()`, `contains()`, The Graphics View Coordinate System, and `prepareGeometryChange()`.

  Specified by:
    `boundingRect` in interface `QGraphicsItemInterface`

### collidesWithItem

    public boolean collidesWithItem(QGraphicsItemInterface other,
                                    Qt.ItemSelectionMode mode)

  Returns true if this item collides with `other`; otherwise returns false. The ways items collide is determined by `mode`. The default value for `mode` is `Qt::IntersectsItemShape` ; `other` collides with this item if it either intersects, contains, or is contained by this item's shape.

  The default implementation is based on shape intersection, and it calls `shape()` on both items. Because the complexity of arbitrary shape-shape intersection grows with an order of magnitude when the shapes are complex, this operation can be noticably time consuming. You have the option of reimplementing this function in a subclass of `QGraphicsItem` to provide a custom algorithm. This allows you to make use of natural constraints in the shapes of your own items, in order to improve the performance of the collision detection. For instance, two untransformed perfectly circular items' collision can be determined very efficiently by comparing their positions and radii.

  Keep in mind that when reimplementing this function and calling `shape()` or `boundingRect()` on `other`, the returned coordinates must be mapped to this item's coordinate system before any intersection can take place.

See also:
  `contains()`, and `shape()`.

  Specified by:
    `collidesWithItem` in interface `QGraphicsItemInterface`

### collidesWithPath

    public boolean collidesWithPath(QPainterPath path,
                                    Qt.ItemSelectionMode mode)

  Returns true if this item collides with `path`.

  The collision is determined by `mode`. The default value for `mode` is `Qt::IntersectsItemShape` ; `path` collides with this item if it either intersects, contains, or is contained by this item's shape.

See also:
  `collidesWithItem()`, `contains()`, and `shape()`.

  Specified by:
    `collidesWithPath` in interface `QGraphicsItemInterface`

### contains

    public boolean contains(QPointF point)

  Returns true if this item contains `point`, which is in local coordinates; otherwise, false is returned. It is most often called from `QGraphicsView` to determine what item is under the cursor, and for that reason, the implementation of this function should be as light-weight as possible.

  By default, this function calls `shape()`, but you can reimplement it in a subclass to provide a (perhaps more efficient) implementation.

See also:
  `shape()`, `boundingRect()`, and `collidesWithPath()`.

  Specified by:
    `contains` in interface `QGraphicsItemInterface`

### contextMenuEvent

    public void contextMenuEvent(QGraphicsSceneContextMenuEvent event)

  This event handler can be reimplemented in a subclass to process context menu events. The `event` parameter contains details about the event to be handled.

  If you ignore the event, (i.e., by calling `QEvent::ignore()`,) `event` will propagate to any item beneath this item. If no items accept the event, it will be ignored by the scene, and propagate to the view.

  It's common to open a `QMenu` in response to receiving a context menu event. Example:

              public class CutsomItem extends QGraphicsItem
              {
                  // ...
                  public void contextMenuEvent(QGraphicsSceneContextMenuEvent event) {
                      QMenu menu = new QMenu();
                      QAction emoveAction = menu.addAction("Remove");
                      QAction arkAction = menu.addAction("Mark");
                      QAction electedAction = menu.exec(event.screenPos());
                      // ...
                  }
                  // ...
              }

  The default implementation ignores the event.

See also:
  `sceneEvent()`.

  Specified by:
    `contextMenuEvent` in interface `QGraphicsItemInterface`

### dragEnterEvent

    public void dragEnterEvent(QGraphicsSceneDragDropEvent event)

  This event handler, for event `event`, can be reimplemented to receive drag enter events for this item. Drag enter events are generated as the cursor enters the item's area.

  By accepting the event, (i.e., by calling `QEvent::accept()`,) the item will accept drop events, in addition to receiving drag move and drag leave. Otherwise, the event will be ignored and propagate to the item beneath. If the event is accepted, the item will receive a drag move event before control goes back to the event loop.

  A common implementation of dragEnterEvent accepts or ignores `event` depending on the associated mime data in `event`. Example:

              public class CutsomItem extends QGraphicsItem
              {
                  public CutsomItem()
                  {
                      setAcceptDrops(true);
                      // ...
                  }

                  public void dragEnterEvent(QGraphicsSceneDragDropEvent event)
                  {
                      event.setAccepted(event.mimeData().hasFormat("text/plain"));
                  }
                  // ...
              }

  Items do not receive drag and drop events by default; to enable this feature, call `setAcceptDrops(true)`.

  The default implementation does nothing.

See also:
  `dropEvent()`, `dragMoveEvent()`, and `dragLeaveEvent()`.

  Specified by:
    `dragEnterEvent` in interface `QGraphicsItemInterface`

### dragLeaveEvent

    public void dragLeaveEvent(QGraphicsSceneDragDropEvent event)

  This event handler, for event `event`, can be reimplemented to receive drag leave events for this item. Drag leave events are generated as the cursor leaves the item's area. Most often you will not need to reimplement this function, but it can be useful for resetting state in your item (e.g., highlighting).

  Calling `QEvent::ignore()` or `QEvent::accept()` on `event` has no effect.

  Items do not receive drag and drop events by default; to enable this feature, call `setAcceptDrops(true)`.

  The default implementation does nothing.

See also:
  `dragEnterEvent()`, `dropEvent()`, and `dragMoveEvent()`.

  Specified by:
    `dragLeaveEvent` in interface `QGraphicsItemInterface`

### dragMoveEvent

    public void dragMoveEvent(QGraphicsSceneDragDropEvent event)

  This event handler, for event `event`, can be reimplemented to receive drag move events for this item. Drag move events are generated as the cursor moves around inside the item's area. Most often you will not need to reimplement this function; it is used to indicate that only parts of the item can accept drops.

  Calling `QEvent::ignore()` or `QEvent::accept()` on `event` toggles whether or not the item will accept drops at the position from the event. By default, `event` is accepted, indicating that the item allows drops at the specified position.

  Items do not receive drag and drop events by default; to enable this feature, call `setAcceptDrops(true)`.

  The default implementation does nothing.

See also:
  `dropEvent()`, `dragEnterEvent()`, and `dragLeaveEvent()`.

  Specified by:
    `dragMoveEvent` in interface `QGraphicsItemInterface`

### dropEvent

    public void dropEvent(QGraphicsSceneDragDropEvent event)

  This event handler, for event `event`, can be reimplemented to receive drop events for this item. Items can only receive drop events if the last drag move event was accepted.

  Calling `QEvent::ignore()` or `QEvent::accept()` on `event` has no effect.

  Items do not receive drag and drop events by default; to enable this feature, call `setAcceptDrops(true)`.

  The default implementation does nothing.

See also:
  `dragEnterEvent()`, `dragMoveEvent()`, and `dragLeaveEvent()`.

  Specified by:
    `dropEvent` in interface `QGraphicsItemInterface`

### focusInEvent

    public void focusInEvent(QFocusEvent event)

  This event handler, for event `event`, can be reimplemented to receive focus in events for this item. The default implementation calls `ensureVisible()`.

See also:
  `focusOutEvent()`, and `sceneEvent()`.

  Specified by:
    `focusInEvent` in interface `QGraphicsItemInterface`

### focusOutEvent

    public void focusOutEvent(QFocusEvent event)

  This event handler, for event `event`, can be reimplemented to receive focus out events for this item. The default implementation does nothing.

See also:
  `focusInEvent()`, and `sceneEvent()`.

  Specified by:
    `focusOutEvent` in interface `QGraphicsItemInterface`

### hoverEnterEvent

    public void hoverEnterEvent(QGraphicsSceneHoverEvent event)

  This event handler, for event `event`, can be reimplemented to receive hover enter events for this item. The default implementation calls `update()`; otherwise it does nothing.

  Calling `QEvent::ignore()` or `QEvent::accept()` on `event` has no effect.

See also:
  `hoverMoveEvent()`, `hoverLeaveEvent()`, `sceneEvent()`, and `setAcceptHoverEvents()`.

  Specified by:
    `hoverEnterEvent` in interface `QGraphicsItemInterface`

### hoverLeaveEvent

    public void hoverLeaveEvent(QGraphicsSceneHoverEvent event)

  This event handler, for event `event`, can be reimplemented to receive hover leave events for this item. The default implementation calls `update()`; otherwise it does nothing.

  Calling `QEvent::ignore()` or `QEvent::accept()` on `event` has no effect.

See also:
  `hoverEnterEvent()`, `hoverMoveEvent()`, `sceneEvent()`, and `setAcceptHoverEvents()`.

  Specified by:
    `hoverLeaveEvent` in interface `QGraphicsItemInterface`

### hoverMoveEvent

    public void hoverMoveEvent(QGraphicsSceneHoverEvent event)

  This event handler, for event `event`, can be reimplemented to receive hover move events for this item. The default implementation does nothing.

  Calling `QEvent::ignore()` or `QEvent::accept()` on `event` has no effect.

See also:
  `hoverEnterEvent()`, `hoverLeaveEvent()`, `sceneEvent()`, and `setAcceptHoverEvents()`.

  Specified by:
    `hoverMoveEvent` in interface `QGraphicsItemInterface`

### inputMethodEvent

    public void inputMethodEvent(QInputMethodEvent event)

  This event handler, for event `event`, can be reimplemented to receive input method events for this item. The default implementation ignores the event.

See also:
  `inputMethodQuery()`, and `sceneEvent()`.

  Specified by:
    `inputMethodEvent` in interface `QGraphicsItemInterface`

### inputMethodQuery

    public java.lang.Object inputMethodQuery(Qt.InputMethodQuery query)

  This method is only relevant for input items. It is used by the input method to query a set of properties of the item to be able to support complex input method operations, such as support for surrounding text and reconversions. `query` specifies which property is queried.

See also:
  `inputMethodEvent()`.

  Specified by:
    `inputMethodQuery` in interface `QGraphicsItemInterface`

### isObscuredBy

    public boolean isObscuredBy(QGraphicsItemInterface item)

  Returns true if this item's bounding rect is completely obscured by the opaque shape of `item`.

  The base implementation maps `item`'s `opaqueArea()` to this item's coordinate system, and then checks if this item's `boundingRect()` is fully contained within the mapped shape.

  You can reimplement this function to provide a custom algorithm for determining whether this item is obscured by `item`.

See also:
  `opaqueArea()`, and `isObscured()`.

  Specified by:
    `isObscuredBy` in interface `QGraphicsItemInterface`

### itemChange

    public java.lang.Object itemChange(QGraphicsItem.GraphicsItemChange change,
                                       java.lang.Object value)

  This virtual function is called by `QGraphicsItem` to notify custom items that some part of the item's state changes. By reimplementing this function, your can react to a change, and in some cases, (depending on `change`,) adjustments can be made.

  `change` is the parameter of the item that is changing. `value` is the new value; the type of the value depends on `change`.

  Example:

                  public Object itemChange(GraphicsItemChange change, Object value)
                  {
                      if (change == GraphicsItemChange.ItemPositionChange && scene() != null) {
                          // value is the new position.
                          QPointF newPos = (QPointF)value;
                          QRectF rect = scene().sceneRect();
                          if (!rect.contains(newPos)) {
                              // Keep the item inside the scene rect.
                              newPos.setX(Math.min(rect.right(), Math.max(newPos.x(), rect.left())));
                              newPos.setY(Math.min(rect.bottom(), Math.max(newPos.y(), rect.top())));
                              return newPos;
                          }
                      }

                      return super.itemChange(change, value);
                  }

  The default implementation does nothing, and returns `value`.

  Note: Certain `QGraphicsItem` functions cannot be called in a reimplementation of this function; see the `GraphicsItemChange` documentation for details.

See also:
  `GraphicsItemChange` .

  Specified by:
    `itemChange` in interface `QGraphicsItemInterface`

### keyPressEvent

    public void keyPressEvent(QKeyEvent event)

  This event handler, for event `event`, can be reimplemented to receive key press events for this item. The default implementation ignores the event. If you reimplement this handler, the event will by default be accepted.

  Calling `QEvent::ignore()` or `QEvent::accept()` on `event` has no effect.

  Note that key events are only received for items that set the `ItemIsFocusable` flag, and that have keyboard input focus.

See also:
  `keyReleaseEvent()`, `setFocus()`, `QGraphicsScene::setFocusItem()`, and `sceneEvent()`.

  Specified by:
    `keyPressEvent` in interface `QGraphicsItemInterface`

### keyReleaseEvent

    public void keyReleaseEvent(QKeyEvent event)

  This event handler, for event `event`, can be reimplemented to receive key release events for this item. The default implementation ignores the event. If you reimplement this handler, the event will by default be accepted.

  Calling `QEvent::ignore()` or `QEvent::accept()` on `event` has no effect.

  Note that key events are only received for items that set the `ItemIsFocusable` flag, and that have keyboard input focus.

See also:
  `keyPressEvent()`, `setFocus()`, `QGraphicsScene::setFocusItem()`, and `sceneEvent()`.

  Specified by:
    `keyReleaseEvent` in interface `QGraphicsItemInterface`

### mouseDoubleClickEvent

    public void mouseDoubleClickEvent(QGraphicsSceneMouseEvent event)

  This event handler, for event `event`, can be reimplemented to receive mouse doubleclick events for this item.

  When doubleclicking an item, the item will first receive a mouse press event, followed by a release event (i.e., a click), then a doubleclick event, and finally a release event.

  Calling `QEvent::ignore()` or `QEvent::accept()` on `event` has no effect.

  The default implementation calls `mousePressEvent()`. If you want to keep the base implementation when reimplementing this function, call `QGraphicsItem::mouseDoubleClickEvent()` in your reimplementation.

See also:
  `mousePressEvent()`, `mouseMoveEvent()`, `mouseReleaseEvent()`, and `sceneEvent()`.

  Specified by:
    `mouseDoubleClickEvent` in interface `QGraphicsItemInterface`

### mouseMoveEvent

    public void mouseMoveEvent(QGraphicsSceneMouseEvent event)

  This event handler, for event `event`, can be reimplemented to receive mouse move events for this item. If you do receive this event, you can be certain that this item also received a mouse press event, and that this item is the current mouse grabber.

  Calling `QEvent::ignore()` or `QEvent::accept()` on `event` has no effect.

  The default implementation handles basic item interaction, such as selection and moving. If you want to keep the base implementation when reimplementing this function, call `QGraphicsItem::mouseMoveEvent()` in your reimplementation.

See also:
  `mousePressEvent()`, `mouseReleaseEvent()`, `mouseDoubleClickEvent()`, and `sceneEvent()`.

  Specified by:
    `mouseMoveEvent` in interface `QGraphicsItemInterface`

### mousePressEvent

    public void mousePressEvent(QGraphicsSceneMouseEvent event)

  This event handler, for event `event`, can be reimplemented to receive mouse press events for this item. Mouse press events are only delivered to items that accept the mouse button that is pressed. By default, an item accepts all mouse buttons, but you can change this by calling `setAcceptedMouseButtons()`.

  The mouse press event decides which item should become the mouse grabber (see `QGraphicsScene::mouseGrabberItem()`). If you do not reimplement this function, the press event will propagate to any topmost item beneath this item, and no other mouse events will be delivered to this item.

  If you do reimplement this function, `event` will by default be accepted (see `QEvent::accept()`), and this item is then the mouse grabber. This allows the item to receive future move, release and doubleclick events. If you call `QEvent::ignore()` on `event`, this item will lose the mouse grab, and `event` will propagate to any topmost item beneath. No further mouse events will be delivered to this item unless a new mouse press event is received.

  The default implementation handles basic item interaction, such as selection and moving. If you want to keep the base implementation when reimplementing this function, call `QGraphicsItem::mousePressEvent()` in your reimplementation.

See also:
  `mouseMoveEvent()`, `mouseReleaseEvent()`, `mouseDoubleClickEvent()`, and `sceneEvent()`.

  Specified by:
    `mousePressEvent` in interface `QGraphicsItemInterface`

### mouseReleaseEvent

    public void mouseReleaseEvent(QGraphicsSceneMouseEvent event)

  This event handler, for event `event`, can be reimplemented to receive mouse release events for this item.

  Calling `QEvent::ignore()` or `QEvent::accept()` on `event` has no effect.

  The default implementation handles basic item interaction, such as selection and moving. If you want to keep the base implementation when reimplementing this function, call `QGraphicsItem::mouseReleaseEvent()` in your reimplementation.

See also:
  `mousePressEvent()`, `mouseMoveEvent()`, `mouseDoubleClickEvent()`, and `sceneEvent()`.

  Specified by:
    `mouseReleaseEvent` in interface `QGraphicsItemInterface`

### opaqueArea

    public QPainterPath opaqueArea()

  This virtual function returns a shape representing the area where this item is opaque. An area is opaque if it is filled using an opaque brush or color (i.e., not transparent).

  This function is used by `isObscuredBy()`, which is called by underlying items to determine if they are obscured by this item.

  The default implementation returns an empty `QPainterPath`, indicating that this item is completely transparent and does not obscure any other items.

See also:
  `isObscuredBy()`, `isObscured()`, and `shape()`.

  Specified by:
    `opaqueArea` in interface `QGraphicsItemInterface`

### paint

    public void paint(QPainter painter,
                      QStyleOptionGraphicsItem option,
                      QWidget widget)

  This function, which is usually called by `QGraphicsView`, paints the contents of an item in local coordinates.

  Reimplement this function in a `QGraphicsItem` subclass to provide the item's painting implementation, using `painter`. The `option` parameter provides style options for the item, such as its state, exposed area and its level-of-detail hints. The `widget` argument is optional. If provided, it points to the widget that is being painted on; otherwise, it is 0. For cached painting, `widget` is always 0.

          public class RoundRectItem extends QGraphicsItem
          {
              // ...
              public void paint(QPainter painter,
                      QStyleOptionGraphicsItem option,
                      QWidget widget) {
                  painter.drawRoundRect(-10, -10, 20, 20, 5, 5);
                  }
              // ...
          }

  The painter's pen is 0-width by default, and its pen is initialized to the `QPalette::Text` brush from the paint device's palette. The brush is initialized to `QPalette::Window` .

  Make sure to constrain all painting inside the boundaries of `boundingRect()` to avoid rendering artifacts (as `QGraphicsView` does not clip the painter for you). In particular, when `QPainter` renders the outline of a shape using an assigned `QPen`, half of the outline will be drawn outside, and half inside, the shape you're rendering (e.g., with a pen width of 2 units, you must draw outlines 1 unit inside `boundingRect()`). `QGraphicsItem` does not support use of cosmetic pens with a non-zero width.

  All painting is done in local coordinates.

See also:
  `setCacheMode()`, `QPen::width()`, and Item Coordinates.

  Specified by:
    `paint` in interface `QGraphicsItemInterface`

### sceneEvent

    public boolean sceneEvent(QEvent event)

  This virtual function receives events to this item. Reimplement this function to intercept events before they are dispatched to the specialized event handlers `contextMenuEvent()`, `focusInEvent()`, `focusOutEvent()`, `hoverEnterEvent()`, `hoverMoveEvent()`, `hoverLeaveEvent()`, `keyPressEvent()`, `keyReleaseEvent()`, `mousePressEvent()`, `mouseReleaseEvent()`, `mouseMoveEvent()`, and `mouseDoubleClickEvent()`.

  Returns true if the event was recognized and handled; otherwise, (e.g., if the event type was not recognized,) false is returned.

  `event` is the intercepted event.

  Specified by:
    `sceneEvent` in interface `QGraphicsItemInterface`

### sceneEventFilter

    public boolean sceneEventFilter(QGraphicsItemInterface watched,
                                    QEvent event)

  Filters events for the item `watched`. `event` is the filtered event.

  Reimplementing this function in a subclass makes it possible for the item to be used as an event filter for other items, intercepting all the events send to those items before they are able to respond.

  Reimplementations must return true to prevent further processing of a given event, ensuring that it will not be delivered to the watched item, or return false to indicate that the event should be propagated further by the event system.

See also:
  `installSceneEventFilter()`.

  Specified by:
    `sceneEventFilter` in interface `QGraphicsItemInterface`

### shape

    public QPainterPath shape()

  Returns the shape of this item as a `QPainterPath` in local coordinates. The shape is used for many things, including collision detection, hit tests, and for the `QGraphicsScene::items()` functions.

  The default implementation calls `boundingRect()` to return a simple rectangular shape, but subclasses can reimplement this function to return a more accurate shape for non-rectangular items. For example, a round item may choose to return an elliptic shape for better collision detection. For example:

          public class RoundItem extends QGraphicsItem
          {
              // ...
              public QPainterPath shape() {
                  QPainterPath path = new QPainterPath();
                  path.addEllipse(boundingRect());
                  return path;
              }
              // ...
          }

  The outline of a shape can vary depending on the width and style of the pen used when drawing. If you want to include this outline in the item's shape, you can create a shape from the stroke using `QPainterPathStroker`.

  This function is called by the default implementations of `contains()` and `collidesWithPath()`.

See also:
  `boundingRect()`, `contains()`, `prepareGeometryChange()`, and `QPainterPathStroker`.

  Specified by:
    `shape` in interface `QGraphicsItemInterface`

### type

    public int type()

  Returns the type of an item as an int. All standard graphicsitem classes are associated with a unique value; see QGraphicsItem::Type. This type information is used by qgraphicsitem_cast() to distinguish between types.

  The default implementation (in `QGraphicsItem`) returns UserType.

  To enable use of qgraphicsitem_cast() with a custom item, reimplement this function and declare a Type enum value equal to your custom item's type. Custom items must return a value larger than or equal to UserType (65536).

  For example:Error parsing snippet.

See also:
  UserType.

  Specified by:
    `type` in interface `QGraphicsItemInterface`

### wheelEvent

    public void wheelEvent(QGraphicsSceneWheelEvent event)

  This event handler, for event `event`, can be reimplemented to receive wheel events for this item. If you reimplement this function, `event` will be accepted by default.

  If you ignore the event, (i.e., by calling `QEvent::ignore()`,) it will propagate to any item beneath this item. If no items accept the event, it will be ignored by the scene, and propagate to the view (e.g., the view's vertical scroll bar).

  The default implementation ignores the event.

See also:
  `sceneEvent()`.

  Specified by:
    `wheelEvent` in interface `QGraphicsItemInterface`

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