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## com.trolltech.qt.gui
Class QTreeWidget

    java.lang.Object
      com.trolltech.qt.internal.QSignalEmitterInternal
          com.trolltech.qt.QSignalEmitter
              com.trolltech.qt.QtJambiObject
                  com.trolltech.qt.core.QObject
                      com.trolltech.qt.gui.QWidget
                          com.trolltech.qt.gui.QFrame
                              com.trolltech.qt.gui.QAbstractScrollArea
                                  com.trolltech.qt.gui.QAbstractItemView
                                      com.trolltech.qt.gui.QTreeView
                                          com.trolltech.qt.gui.QTreeWidget

All Implemented Interfaces:
  QPaintDeviceInterface, QtJambiInterface

    public class QTreeWidget

extends QTreeView

The QTreeWidget class provides a tree view that uses a predefined tree model. The QTreeWidget class is a convenience class that provides a standard tree widget with a classic item-based interface similar to that used by the `QListView` class in Qt 3. This class is based on Qt's Model/View architecture and uses a default model to hold items, each of which is a `QTreeWidgetItem`.

Developers who do not need the flexibility of the Model/View framework can use this class to create simple hierarchical lists very easily. A more flexible approach involves combining a `QTreeView` with a standard item model. This allows the storage of data to be separated from its representation.

In its simplest form, a tree widget can be constructed in the following way:

            QTreeWidget treeWidget = new QTreeWidget();
            treeWidget.setColumnCount(1);
            List<QTreeWidgetItem> items = new ArrayList<QTreeWidgetItem>();
            for (int i = 0; i < 10; ++i) {
                List<String> lst = new ArrayList<String>();
                lst.add("item: " + i);
                items.add(new QTreeWidgetItem((QTreeWidgetItem) null, lst));
            }
            treeWidget.insertTopLevelItems(0, items);

Before items can be added to the tree widget, the number of columns must be set with `setColumnCount()`. This allows each item to have one or more labels or other decorations. The number of columns in use can be found with the `columnCount()` function.

The tree can have a header that contains a section for each column in the widget. It is easiest to set up the labels for each section by supplying a list of strings with `setHeaderLabels()`, but a custom header can be constructed with a `QTreeWidgetItem` and inserted into the tree with the `setHeaderItem()` function.

The items in the tree can be sorted by column according to a predefined sort order. If sorting is enabled, the user can sort the items by clicking on a column header. Sorting can be enabled or disabled by calling `setSortingEnabled()`. The `isSortingEnabled()` function indicates whether sorting is enabled.

A Windows XP style tree widget. | A Macintosh style tree widget. | A Plastique style tree widget.

See also:
  `QTreeWidgetItem`, `QTreeWidgetItemIterator`, `QTreeView`, Model/View Programming, and Settings Editor Example.

Nested Class Summary

Nested classes/interfaces inherited from class com.trolltech.qt.gui.QAbstractItemView
`QAbstractItemView.CursorAction, QAbstractItemView.DragDropMode, QAbstractItemView.DropIndicatorPosition, QAbstractItemView.EditTrigger, QAbstractItemView.EditTriggers, QAbstractItemView.ScrollHint, QAbstractItemView.ScrollMode, QAbstractItemView.SelectionBehavior, QAbstractItemView.SelectionMode, QAbstractItemView.State`

Nested classes/interfaces inherited from class com.trolltech.qt.gui.QFrame
`QFrame.Shadow, QFrame.Shape, QFrame.StyleMask`

Nested classes/interfaces inherited from class com.trolltech.qt.gui.QWidget
`QWidget.RenderFlag, QWidget.RenderFlags`

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
`QSignalEmitter.Signal2` | `currentItemChanged` This signal takes 2 generic argument(s).
`QSignalEmitter.Signal2` | `itemActivated` This signal takes 2 generic argument(s).
`QSignalEmitter.Signal2` | `itemChanged` This signal takes 2 generic argument(s).
`QSignalEmitter.Signal2` | `itemClicked` This signal takes 2 generic argument(s).
`QSignalEmitter.Signal1` | `itemCollapsed` This signal takes 1 generic argument(s).
`QSignalEmitter.Signal2` | `itemDoubleClicked` This signal takes 2 generic argument(s).
`QSignalEmitter.Signal2` | `itemEntered` This signal takes 2 generic argument(s).
`QSignalEmitter.Signal1` | `itemExpanded` This signal takes 1 generic argument(s).
`QSignalEmitter.Signal2` | `itemPressed` This signal takes 2 generic argument(s).
`QSignalEmitter.Signal0` | `itemSelectionChanged` This signal is emitted when the selection changes in the tree widget.

Fields inherited from class com.trolltech.qt.gui.QTreeView
`collapsed, expanded`

Fields inherited from class com.trolltech.qt.gui.QAbstractItemView
`activated, clicked, doubleClicked, entered, pressed, viewportEntered`

Fields inherited from class com.trolltech.qt.gui.QWidget
`customContextMenuRequested`

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

Constructor Summary
`QTreeWidget()` Constructs a tree widget with the given `parent`.
`QTreeWidget(QWidget parent)` Constructs a tree widget with the given `parent`.

Method Summary
`void` | `addTopLevelItem(QTreeWidgetItem item)` Appends the `item` as a top-level item in the widget.
`void` | `addTopLevelItems(java.util.List items)` Appends the list of `items` as a top-level items in the widget.
`void` | `clear()` Clears the tree widget by removing all of its items and selections.
`void` | `closePersistentEditor(QTreeWidgetItem item)` Closes the persistent editor for the `item` in the given `column`.
`void` | `closePersistentEditor(QTreeWidgetItem item, int column)` Closes the persistent editor for the `item` in the given `column`.
`void` | `collapseItem(QTreeWidgetItem item)` Closes the `item`.
`int` | `columnCount()` This property holds the number of columns displayed in the tree widget.
`int` | `currentColumn()` Returns the current column in the tree widget.
`QTreeWidgetItem` | `currentItem()` Returns the current item in the tree widget.
`protected boolean` | `dropMimeData(QTreeWidgetItem parent, int index, QMimeData data, Qt.DropAction action)` Handles the `data` supplied by a drag and drop operation that ended with the given `action` in the `index` in the given `parent` item.
`void` | `editItem(QTreeWidgetItem item)` Starts editing the `item` in the given `column` if it is editable.
`void` | `editItem(QTreeWidgetItem item, int column)` Starts editing the `item` in the given `column` if it is editable.
`void` | `expandItem(QTreeWidgetItem item)` Expands the `item`.
`java.util.List` | `findItems(java.lang.String text, Qt.MatchFlags flags)` Returns a list of items that match the given `text`, using the given `flags`, in the given `column`.
`java.util.List` | `findItems(java.lang.String text, Qt.MatchFlags flags, int column)` Returns a list of items that match the given `text`, using the given `flags`, in the given `column`.
`QTreeWidgetItem` | `headerItem()` Returns the item used for the tree widget's header.
`protected com.trolltech.qt.core.QModelIndex` | `indexFromItem(QTreeWidgetItem item)` Returns the QModelIndex assocated with the given `item` in the given `column`.
`protected com.trolltech.qt.core.QModelIndex` | `indexFromItem(QTreeWidgetItem item, int column)` Returns the QModelIndex assocated with the given `item` in the given `column`.
`void` | `insertTopLevelItem(int index, QTreeWidgetItem item)` Inserts the `item` at `index` in the top level in the view.
`void` | `insertTopLevelItems(int index, java.util.List items)` Inserts the list of `items` at `index` in the top level in the view.
`QTreeWidgetItem` | `invisibleRootItem()` Returns the tree widget's invisible root item.
`boolean` | `isFirstItemColumnSpanned(QTreeWidgetItem item)` Returns true if the given `item` is set to show only one section over all columns; otherwise returns false.
`QTreeWidgetItem` | `itemAbove(QTreeWidgetItem item)` Returns the item above the given `item`.
`QTreeWidgetItem` | `itemAt(int x, int y)` Returns a pointer to the item at the coordinates (`x`, `y`).
`QTreeWidgetItem` | `itemAt(QPoint p)` Returns a pointer to the item at the coordinates `p`.
`QTreeWidgetItem` | `itemBelow(QTreeWidgetItem item)` Returns the item visually below the given `item`.
`protected QTreeWidgetItem` | `itemFromIndex(com.trolltech.qt.core.QModelIndex index)` Returns a pointer to the `QTreeWidgetItem` assocated with the given `index`.
`QWidget` | `itemWidget(QTreeWidgetItem item, int column)` Returns the widget displayed in the cell specified by `item` and the given `column`.
`protected QMimeData` | `mimeData(java.util.List items)` Returns an object that contains a serialized description of the specified `items`.
`protected java.util.List` | `mimeTypes()` Returns a list of MIME types that can be used to describe a list of treewidget items.
`void` | `openPersistentEditor(QTreeWidgetItem item)` Opens a persistent editor for the `item` in the given `column`.
`void` | `openPersistentEditor(QTreeWidgetItem item, int column)` Opens a persistent editor for the `item` in the given `column`.
`void` | `removeItemWidget(QTreeWidgetItem item, int column)` Removes the widget set in the given `item` in the given `column`.
`void` | `scrollToItem(QTreeWidgetItem item)` Ensures that the `item` is visible, scrolling the view if necessary using the specified `hint`.
`void` | `scrollToItem(QTreeWidgetItem item, QAbstractItemView.ScrollHint hint)` Ensures that the `item` is visible, scrolling the view if necessary using the specified `hint`.
`java.util.List` | `selectedItems()` Returns a list of all selected non-hidden items.
`void` | `setColumnCount(int columns)` This property holds the number of columns displayed in the tree widget.
`void` | `setCurrentItem(QTreeWidgetItem item)` Sets the current `item` in the tree widget.
`void` | `setCurrentItem(QTreeWidgetItem item, int column)` Sets the current `item` in the tree widget and the current column to `column`.
`void` | `setCurrentItem(QTreeWidgetItem item, int column, QItemSelectionModel.SelectionFlag[] command)`
`void` | `setCurrentItem(QTreeWidgetItem item, int column, QItemSelectionModel.SelectionFlags command)` Sets the current `item` in the tree widget and the current column to `column`, using the given `command`.
`void` | `setFirstItemColumnSpanned(QTreeWidgetItem item, boolean span)` Sets the given `item` to only show one section for all columns if `span` is true; otherwise the item will show one section per column.
`void` | `setHeaderItem(QTreeWidgetItem item)` Sets the header `item` for the tree widget.
`void` | `setHeaderLabel(java.lang.String label)` Same as setHeaderLabels(QStringList(`label`)).
`void` | `setHeaderLabels(java.util.List labels)` Adds a column in the header for each item in the `labels` list, and sets the label for each column.
`void` | `setItemWidget(QTreeWidgetItem item, int column, QWidget widget)` Sets the given `widget` to be displayed in the cell specified by the given `item` and `column`.
`int` | `sortColumn()` Returns the column used to sort the contents of the widget.
`void` | `sortItems(int column, Qt.SortOrder order)` Sorts the items in the widget in the specified `order` by the values in the given `column`.
`protected Qt.DropActions` | `supportedDropActions()` Returns the drop actions supported by this view.
`QTreeWidgetItem` | `takeTopLevelItem(int index)` Removes the top-level item at the given `index` in the tree and returns it, otherwise returns 0;
`QTreeWidgetItem` | `topLevelItem(int index)` Returns the top level item at the given `index`, or 0 if the item does not exist.
`int` | `topLevelItemCount()` This property holds the number of top-level items.
`QRect` | `visualItemRect(QTreeWidgetItem item)` Returns the rectangle on the viewport occupied by the item at `item`.

Methods inherited from class com.trolltech.qt.gui.QTreeView
`allColumnsShowFocus, autoExpandDelay, collapse, collapseAll, columnAt, columnCountChanged, columnMoved, columnResized, columnViewportPosition, columnWidth, drawBranches, drawRow, drawTree, expand, expandAll, expandsOnDoubleClick, expandToDepth, header, hideColumn, indentation, indexAbove, indexBelow, indexRowSizeHint, isAnimated, isColumnHidden, isExpanded, isFirstColumnSpanned, isHeaderHidden, isRowHidden, isSortingEnabled, itemsExpandable, resizeColumnToContents, rootIsDecorated, rowHeight, rowsRemoved, setAllColumnsShowFocus, setAnimated, setAutoExpandDelay, setColumnHidden, setColumnWidth, setExpanded, setExpandsOnDoubleClick, setFirstColumnSpanned, setHeader, setHeaderHidden, setIndentation, setItemsExpandable, setRootIsDecorated, setRowHidden, setSortingEnabled, setUniformRowHeights, setWordWrap, showColumn, sortByColumn, uniformRowHeights, wordWrap`

Methods inherited from class com.trolltech.qt.gui.QAbstractItemView
`alternatingRowColors, autoScrollMargin, clearSelection, closeEditor, closePersistentEditor, commitData, currentChanged, currentIndex, dataChanged, dirtyRegionOffset, dragDropMode, dragDropOverwriteMode, dragEnabled, dropIndicatorPosition, edit, edit, editorDestroyed, editTriggers, executeDelayedItemsLayout, hasAutoScroll, horizontalOffset, horizontalScrollMode, iconSize, indexAt, indexWidget, isIndexHidden, itemDelegate, itemDelegate, itemDelegateForColumn, itemDelegateForRow, keyboardSearch, model, moveCursor, openPersistentEditor, reset, rootIndex, rowsAboutToBeRemoved, rowsInserted, scheduleDelayedItemsLayout, scrollDirtyRegion, scrollTo, scrollTo, scrollToBottom, scrollToTop, selectAll, selectedIndexes, selectionBehavior, selectionChanged, selectionCommand, selectionCommand, selectionMode, selectionModel, setAlternatingRowColors, setAutoScroll, setAutoScrollMargin, setCurrentIndex, setDirtyRegion, setDragDropMode, setDragDropOverwriteMode, setDragEnabled, setDropIndicatorShown, setEditTriggers, setEditTriggers, setHorizontalScrollMode, setIconSize, setIndexWidget, setItemDelegate, setItemDelegateForColumn, setItemDelegateForRow, setModel, setRootIndex, setSelection, setSelectionBehavior, setSelectionMode, setSelectionModel, setState, setTabKeyNavigation, setTextElideMode, setVerticalScrollMode, showDropIndicator, sizeHintForColumn, sizeHintForIndex, sizeHintForRow, startDrag, startDrag, state, tabKeyNavigation, textElideMode, update, updateGeometries, verticalOffset, verticalScrollMode, viewOptions, visualRect, visualRegionForSelection`

Methods inherited from class com.trolltech.qt.gui.QAbstractScrollArea
`addScrollBarWidget, addScrollBarWidget, cornerWidget, horizontalScrollBar, horizontalScrollBarPolicy, maximumViewportSize, scrollBarWidgets, scrollBarWidgets, scrollContentsBy, setCornerWidget, setHorizontalScrollBar, setHorizontalScrollBarPolicy, setupViewport, setVerticalScrollBar, setVerticalScrollBarPolicy, setViewport, setViewportMargins, verticalScrollBar, verticalScrollBarPolicy, viewport, viewportEvent`

Methods inherited from class com.trolltech.qt.gui.QFrame
`frameRect, frameShadow, frameShape, frameStyle, frameWidth, lineWidth, midLineWidth, setFrameRect, setFrameShadow, setFrameShape, setFrameStyle, setLineWidth, setMidLineWidth`

Methods inherited from class com.trolltech.qt.gui.QWidget
`acceptDrops, accessibleDescription, accessibleName, actionEvent, actions, activateWindow, addAction, addActions, adjustSize, autoFillBackground, backgroundRole, baseSize, changeEvent, childAt, childAt, childrenRect, childrenRegion, clearFocus, clearMask, close, closeEvent, contentsRect, contextMenuEvent, contextMenuPolicy, cursor, depth, destroy, destroy, destroy, dragEnterEvent, dragLeaveEvent, dragMoveEvent, dropEvent, effectiveWinId, ensurePolished, enterEvent, focusInEvent, focusNextChild, focusNextPrevChild, focusOutEvent, focusPolicy, focusPreviousChild, focusProxy, focusWidget, font, fontInfo, fontMetrics, foregroundRole, frameGeometry, frameSize, geometry, getContentsMargins, grabKeyboard, grabMouse, grabMouse, grabShortcut, grabShortcut, hasFocus, hasMouseTracking, height, heightForWidth, heightMM, hide, hideEvent, inputContext, inputMethodEvent, inputMethodQuery, insertAction, insertActions, isActiveWindow, isAncestorOf, isEnabled, isEnabledTo, isFullScreen, isHidden, isMaximized, isMinimized, isModal, isVisible, isVisibleTo, isWindow, isWindowModified, keyboardGrabber, keyPressEvent, keyReleaseEvent, languageChange, layout, layoutDirection, leaveEvent, locale, logicalDpiX, logicalDpiY, lower, mapFrom, mapFromGlobal, mapFromParent, mapTo, mapToGlobal, mapToParent, mask, maximumHeight, maximumSize, maximumWidth, metric, minimumHeight, minimumSize, minimumSizeHint, minimumWidth, mouseDoubleClickEvent, mouseGrabber, mouseMoveEvent, mousePressEvent, mouseReleaseEvent, move, move, moveEvent, nativeParentWidget, nextInFocusChain, normalGeometry, numColors, overrideWindowFlags, overrideWindowFlags, overrideWindowState, paintEngine, paintEvent, paintingActive, palette, parentWidget, physicalDpiX, physicalDpiY, pos, raise, rect, releaseKeyboard, releaseMouse, releaseShortcut, removeAction, render, render, render, render, render, render, render, render, render, repaint, repaint, repaint, repaint, resetInputContext, resize, resize, resizeEvent, restoreGeometry, saveGeometry, scroll, scroll, setAcceptDrops, setAccessibleDescription, setAccessibleName, setAttribute, setAttribute, setAutoFillBackground, setBackgroundRole, setBaseSize, setBaseSize, setContentsMargins, setContentsMargins, setContextMenuPolicy, setCursor, setDisabled, setEnabled, setFixedHeight, setFixedSize, setFixedSize, setFixedWidth, setFocus, setFocus, setFocusPolicy, setFocusProxy, setFont, setForegroundRole, setGeometry, setGeometry, setHidden, setInputContext, setLayout, setLayoutDirection, setLocale, setMask, setMask, setMaximumHeight, setMaximumSize, setMaximumSize, setMaximumWidth, setMinimumHeight, setMinimumSize, setMinimumSize, setMinimumWidth, setMouseTracking, setPalette, setParent, setParent, setParent, setShortcutAutoRepeat, setShortcutAutoRepeat, setShortcutEnabled, setShortcutEnabled, setSizeIncrement, setSizeIncrement, setSizePolicy, setSizePolicy, setStatusTip, setStyle, setStyleSheet, setTabOrder, setToolTip, setUpdatesEnabled, setVisible, setWhatsThis, setWindowFilePath, setWindowFlags, setWindowFlags, setWindowIcon, setWindowIconText, setWindowModality, setWindowModified, setWindowOpacity, setWindowRole, setWindowState, setWindowState, setWindowTitle, show, showEvent, showFullScreen, showMaximized, showMinimized, showNormal, size, sizeHint, sizeIncrement, sizePolicy, stackUnder, statusTip, style, styleSheet, tabletEvent, testAttribute, toolTip, underMouse, unsetCursor, unsetLayoutDirection, unsetLocale, update, update, update, update, updateGeometry, updateMicroFocus, updatesEnabled, visibleRegion, whatsThis, wheelEvent, width, widthMM, window, windowFilePath, windowFlags, windowIcon, windowIconText, windowModality, windowOpacity, windowRole, windowState, windowTitle, windowType, winId, x, y`

Methods inherited from class com.trolltech.qt.core.QObject
`childEvent, children, connectSlotsByName, customEvent, disposeLater, dumpObjectInfo, dumpObjectTree, dynamicPropertyNames, event, eventFilter, findChild, findChild, findChild, findChildren, findChildren, findChildren, findChildren, indexOfProperty, installEventFilter, isWidgetType, killTimer, moveToThread, objectName, parent, properties, property, removeEventFilter, setObjectName, setParent, setProperty, startTimer, timerEvent, toString, userProperty`

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, wait, wait, wait`

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

Field Detail

### currentItemChanged

    public final QSignalEmitter.Signal2 currentItemChanged

  This signal takes 2 generic argument(s). We list their type and the name they go by in the description of this signal. <com.trolltech.qt.gui.QTreeWidgetItem(named: current), com.trolltech.qt.gui.QTreeWidgetItem(named: previous)>:

  This signal is emitted when the current item changes. The current item is specified by `current`, and this replaces the `previous` current item.

See also:
  `setCurrentItem()`.

### itemActivated

    public final QSignalEmitter.Signal2 itemActivated

  This signal takes 2 generic argument(s). We list their type and the name they go by in the description of this signal. <com.trolltech.qt.gui.QTreeWidgetItem(named: item), java.lang.Integer(named: column)>:

  This signal is emitted when the user activates an item by single- or double-clicking (depending on the platform, i. . on the `QStyle::SH_ItemView_ActivateItemOnSingleClick` style hint) or pressing a special key (e.g., Enter).

  The specified `item` is the item that was clicked, or 0 if no item was clicked. The `column` is the item's column that was clicked, or -1 if no item was clicked.

### itemChanged

    public final QSignalEmitter.Signal2 itemChanged

  This signal takes 2 generic argument(s). We list their type and the name they go by in the description of this signal. <com.trolltech.qt.gui.QTreeWidgetItem(named: item), java.lang.Integer(named: column)>:

  This signal is emitted when the contents of the `column` in the specified `item` changes.

### itemClicked

    public final QSignalEmitter.Signal2 itemClicked

  This signal takes 2 generic argument(s). We list their type and the name they go by in the description of this signal. <com.trolltech.qt.gui.QTreeWidgetItem(named: item), java.lang.Integer(named: column)>:

  This signal is emitted when the user clicks inside the widget.

  The specified `item` is the item that was clicked. The `column` is the item's column that was clicked. If no item was clicked, no signal will be emitted.

### itemCollapsed

    public final QSignalEmitter.Signal1 itemCollapsed

  This signal takes 1 generic argument(s). We list their type and the name they go by in the description of this signal. <com.trolltech.qt.gui.QTreeWidgetItem(named: item)>:

  This signal is emitted when the specified `item` is collapsed so that none of its children are displayed.

  Note: This signal will not be emitted if an item changes its state when `collapseAll()` is invoked.

See also:
  isItemExpanded(), `itemExpanded()` , and `collapseItem()`.

### itemDoubleClicked

    public final QSignalEmitter.Signal2 itemDoubleClicked

  This signal takes 2 generic argument(s). We list their type and the name they go by in the description of this signal. <com.trolltech.qt.gui.QTreeWidgetItem(named: item), java.lang.Integer(named: column)>:

  This signal is emitted when the user double clicks inside the widget.

  The specified `item` is the item that was clicked, or 0 if no item was clicked. The `column` is the item's column that was clicked. If no item was double clicked, no signal will be emitted.

### itemEntered

    public final QSignalEmitter.Signal2 itemEntered

  This signal takes 2 generic argument(s). We list their type and the name they go by in the description of this signal. <com.trolltech.qt.gui.QTreeWidgetItem(named: item), java.lang.Integer(named: column)>:

  This signal is emitted when the mouse cursor enters an `item` over the specified `column`. QTreeWidget mouse tracking needs to be enabled for this feature to work.

### itemExpanded

    public final QSignalEmitter.Signal1 itemExpanded

  This signal takes 1 generic argument(s). We list their type and the name they go by in the description of this signal. <com.trolltech.qt.gui.QTreeWidgetItem(named: item)>:

  This signal is emitted when the specified `item` is expanded so that all of its children are displayed.

  Note: This signal will not be emitted if an item changes its state when `expandAll()` is invoked.

See also:
  setItemExpanded(), isItemExpanded(), `itemCollapsed()` , and `expandItem()`.

### itemPressed

    public final QSignalEmitter.Signal2 itemPressed

  This signal takes 2 generic argument(s). We list their type and the name they go by in the description of this signal. <com.trolltech.qt.gui.QTreeWidgetItem(named: item), java.lang.Integer(named: column)>:

  This signal is emitted when the user presses a mouse button inside the widget.

  The specified `item` is the item that was clicked, or 0 if no item was clicked. The `column` is the item's column that was clicked, or -1 if no item was clicked.

### itemSelectionChanged

    public final QSignalEmitter.Signal0 itemSelectionChanged

  This signal is emitted when the selection changes in the tree widget. The current selection can be found with `selectedItems()`.

Constructor Detail

### QTreeWidget

    public QTreeWidget()

  Constructs a tree widget with the given `parent`.

### QTreeWidget

    public QTreeWidget(QWidget parent)

  Constructs a tree widget with the given `parent`.

Method Detail

### addTopLevelItem

    public final void addTopLevelItem(QTreeWidgetItem item)

  Appends the `item` as a top-level item in the widget.

See also:
  `insertTopLevelItem()`.

### addTopLevelItems

    public final void addTopLevelItems(java.util.List items)

  Appends the list of `items` as a top-level items in the widget.

See also:
  `insertTopLevelItems()`.

### clear

    public final void clear()

  Clears the tree widget by removing all of its items and selections.

  Note: Since each item is removed from the tree widget before being deleted, the return value of `QTreeWidgetItem::treeWidget()` will be invalid when called from an item's destructor.

See also:
  `takeTopLevelItem()`, `topLevelItemCount()`, and `columnCount()`.

### closePersistentEditor

    public final void closePersistentEditor(QTreeWidgetItem item)

  Closes the persistent editor for the `item` in the given `column`.

  This function has no effect if no persistent editor is open for this combination of item and column.

See also:
  `openPersistentEditor()`.

### closePersistentEditor

    public final void closePersistentEditor(QTreeWidgetItem item,
                                            int column)

  Closes the persistent editor for the `item` in the given `column`.

  This function has no effect if no persistent editor is open for this combination of item and column.

See also:
  `openPersistentEditor()`.

### collapseItem

    public final void collapseItem(QTreeWidgetItem item)

  Closes the `item`. This causes the tree containing the item's children to be collapsed.

See also:
  `expandItem()`, `currentItem()`, `itemAt()`, and `topLevelItem()`.

### columnCount

    public final int columnCount()

  This property holds the number of columns displayed in the tree widget. By default, this property has a value of 1.

### currentColumn

    public final int currentColumn()

  Returns the current column in the tree widget.

See also:
  `setCurrentItem()`, and `columnCount()`.

### currentItem

    public final QTreeWidgetItem currentItem()

  Returns the current item in the tree widget.

See also:
  `setCurrentItem()`, and `currentItemChanged()` .

### editItem

    public final void editItem(QTreeWidgetItem item)

  Starts editing the `item` in the given `column` if it is editable.

### editItem

    public final void editItem(QTreeWidgetItem item,
                               int column)

  Starts editing the `item` in the given `column` if it is editable.

### expandItem

    public final void expandItem(QTreeWidgetItem item)

  Expands the `item`. This causes the tree containing the item's children to be expanded.

See also:
  `collapseItem()`, `currentItem()`, `itemAt()`, `topLevelItem()`, and `itemExpanded()` .

### findItems

    public final java.util.List findItems(java.lang.String text,
                                          Qt.MatchFlags flags)

  Returns a list of items that match the given `text`, using the given `flags`, in the given `column`.

### findItems

    public final java.util.List findItems(java.lang.String text,
                                          Qt.MatchFlags flags,
                                          int column)

  Returns a list of items that match the given `text`, using the given `flags`, in the given `column`.

### headerItem

    public final QTreeWidgetItem headerItem()

  Returns the item used for the tree widget's header.

See also:
  `setHeaderItem()`.

### indexFromItem

    protected final com.trolltech.qt.core.QModelIndex indexFromItem(QTreeWidgetItem item)

  Returns the QModelIndex assocated with the given `item` in the given `column`.

See also:
  `itemFromIndex()`, and `topLevelItem()`.

### indexFromItem

    protected final com.trolltech.qt.core.QModelIndex indexFromItem(QTreeWidgetItem item,
                                                                    int column)

  Returns the QModelIndex assocated with the given `item` in the given `column`.

See also:
  `itemFromIndex()`, and `topLevelItem()`.

### insertTopLevelItem

    public final void insertTopLevelItem(int index,
                                         QTreeWidgetItem item)

  Inserts the `item` at `index` in the top level in the view.

  If the item has already been inserted somewhere else it wont be inserted.

See also:
  `addTopLevelItem()`, and `columnCount()`.

### insertTopLevelItems

    public final void insertTopLevelItems(int index,
                                          java.util.List items)

  Inserts the list of `items` at `index` in the top level in the view.

  Items that have already been inserted somewhere else wont be inserted.

See also:
  `addTopLevelItems()`.

### invisibleRootItem

    public final QTreeWidgetItem invisibleRootItem()

  Returns the tree widget's invisible root item.

  The invisible root item provides access to the tree widget's top-level items through the `QTreeWidgetItem` API, making it possible to write functions that can treat top-level items and their children in a uniform way; for example, recursive functions.

### isFirstItemColumnSpanned

    public final boolean isFirstItemColumnSpanned(QTreeWidgetItem item)

  Returns true if the given `item` is set to show only one section over all columns; otherwise returns false.

See also:
  `setFirstItemColumnSpanned()`.

### itemAbove

    public final QTreeWidgetItem itemAbove(QTreeWidgetItem item)

  Returns the item above the given `item`.

### itemAt

    public final QTreeWidgetItem itemAt(QPoint p)

  Returns a pointer to the item at the coordinates `p`.

See also:
  `visualItemRect()`.

### itemAt

    public final QTreeWidgetItem itemAt(int x,
                                        int y)

  Returns a pointer to the item at the coordinates (`x`, `y`).

### itemBelow

    public final QTreeWidgetItem itemBelow(QTreeWidgetItem item)

  Returns the item visually below the given `item`.

### itemFromIndex

    protected final QTreeWidgetItem itemFromIndex(com.trolltech.qt.core.QModelIndex index)

  Returns a pointer to the `QTreeWidgetItem` assocated with the given `index`.

See also:
  `indexFromItem()`.

### itemWidget

    public final QWidget itemWidget(QTreeWidgetItem item,
                                    int column)

  Returns the widget displayed in the cell specified by `item` and the given `column`.

  Note: The tree takes ownership of the widget.

See also:
  `setItemWidget()`.

### openPersistentEditor

    public final void openPersistentEditor(QTreeWidgetItem item)

  Opens a persistent editor for the `item` in the given `column`.

See also:
  `closePersistentEditor()`.

### openPersistentEditor

    public final void openPersistentEditor(QTreeWidgetItem item,
                                           int column)

  Opens a persistent editor for the `item` in the given `column`.

See also:
  `closePersistentEditor()`.

### removeItemWidget

    public final void removeItemWidget(QTreeWidgetItem item,
                                       int column)

  Removes the widget set in the given `item` in the given `column`.

### scrollToItem

    public final void scrollToItem(QTreeWidgetItem item)

  Ensures that the `item` is visible, scrolling the view if necessary using the specified `hint`.

See also:
  `currentItem()`, `itemAt()`, and `topLevelItem()`.

### scrollToItem

    public final void scrollToItem(QTreeWidgetItem item,
                                   QAbstractItemView.ScrollHint hint)

  Ensures that the `item` is visible, scrolling the view if necessary using the specified `hint`.

See also:
  `currentItem()`, `itemAt()`, and `topLevelItem()`.

### selectedItems

    public final java.util.List selectedItems()

  Returns a list of all selected non-hidden items.

See also:
  `itemSelectionChanged()` .

### setColumnCount

    public final void setColumnCount(int columns)

  This property holds the number of columns displayed in the tree widget. By default, this property has a value of 1.

### setCurrentItem

    public final void setCurrentItem(QTreeWidgetItem item)

  Sets the current `item` in the tree widget.

  Depending on the current selection mode, the item may also be selected.

See also:
  `currentItem()`, and `currentItemChanged()` .

### setCurrentItem

    public final void setCurrentItem(QTreeWidgetItem item,
                                     int column)

  Sets the current `item` in the tree widget and the current column to `column`.

See also:
  `currentItem()`.

### setCurrentItem

    public final void setCurrentItem(QTreeWidgetItem item,
                                     int column,
                                     QItemSelectionModel.SelectionFlag[] command)

### setCurrentItem

    public final void setCurrentItem(QTreeWidgetItem item,
                                     int column,
                                     QItemSelectionModel.SelectionFlags command)

  Sets the current `item` in the tree widget and the current column to `column`, using the given `command`.

See also:
  `currentItem()`.

### setFirstItemColumnSpanned

    public final void setFirstItemColumnSpanned(QTreeWidgetItem item,
                                                boolean span)

  Sets the given `item` to only show one section for all columns if `span` is true; otherwise the item will show one section per column.

See also:
  `isFirstItemColumnSpanned()`.

### setHeaderItem

    public final void setHeaderItem(QTreeWidgetItem item)

  Sets the header `item` for the tree widget. The label for each column in the header is supplied by the corresponding label in the item.

  The tree widget takes ownership of the item.

See also:
  `headerItem()`, and `setHeaderLabels()`.

### setHeaderLabel

    public final void setHeaderLabel(java.lang.String label)

  Same as setHeaderLabels(QStringList(`label`)).

### setHeaderLabels

    public final void setHeaderLabels(java.util.List labels)

  Adds a column in the header for each item in the `labels` list, and sets the label for each column.

  Note that `setHeaderLabels()` won't remove existing columns.

See also:
  `setHeaderItem()`, and `setHeaderLabel()`.

### setItemWidget

    public final void setItemWidget(QTreeWidgetItem item,
                                    int column,
                                    QWidget widget)

  Sets the given `widget` to be displayed in the cell specified by the given `item` and `column`.

  Note that the given `widget`'s `autoFillBackground` property must be set to true, otherwise the widget's background will be transparent, showing both the model data and the tree widget item.

  This function should only be used to display static content in the place of a tree widget item. If you want to display custom dynamic content or implement a custom editor widget, use `QTreeView` and subclass `QItemDelegate` instead.

  Note: The tree takes ownership of the widget.

See also:
  `itemWidget()`, and Delegate Classes.

### sortColumn

    public final int sortColumn()

  Returns the column used to sort the contents of the widget.

See also:
  `sortItems()`.

### sortItems

    public final void sortItems(int column,
                                Qt.SortOrder order)

  Sorts the items in the widget in the specified `order` by the values in the given `column`.

See also:
  `sortColumn()`.

### takeTopLevelItem

    public final QTreeWidgetItem takeTopLevelItem(int index)

  Removes the top-level item at the given `index` in the tree and returns it, otherwise returns 0;

See also.
  `insertTopLevelItem()`, `topLevelItem()`, and `topLevelItemCount()`.

### topLevelItem

    public final QTreeWidgetItem topLevelItem(int index)

  Returns the top level item at the given `index`, or 0 if the item does not exist.

See also:
  `topLevelItemCount()`, and `insertTopLevelItem()`.

### topLevelItemCount

    public final int topLevelItemCount()

  This property holds the number of top-level items. By default, this property has a value of 0.

See also:
  `columnCount()`, and `currentItem()`.

### visualItemRect

    public final QRect visualItemRect(QTreeWidgetItem item)

  Returns the rectangle on the viewport occupied by the item at `item`.

See also:
  `itemAt()`.

### dropMimeData

    protected boolean dropMimeData(QTreeWidgetItem parent,
                                   int index,
                                   QMimeData data,
                                   Qt.DropAction action)

  Handles the `data` supplied by a drag and drop operation that ended with the given `action` in the `index` in the given `parent` item.

  The default implementation returns true if the drop was successfully handled by decoding the mime data and inserting it into the model; otherwise it returns false.

See also:
  `supportedDropActions()`.

### mimeData

    protected QMimeData mimeData(java.util.List items)

  Returns an object that contains a serialized description of the specified `items`. The format used to describe the items is obtained from the `mimeTypes()` function.

  If the list of items is empty, 0 is returned rather than a serialized empty list.

### mimeTypes

    protected java.util.List mimeTypes()

  Returns a list of MIME types that can be used to describe a list of treewidget items.

See also:
  `mimeData()`.

### supportedDropActions

    protected Qt.DropActions supportedDropActions()

  Returns the drop actions supported by this view.

See also:
  Qt::DropActions.

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