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## com.trolltech.qt.gui
Class QBoxLayout

    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.QLayout
                          com.trolltech.qt.gui.QBoxLayout

All Implemented Interfaces:
  QLayoutItemInterface, QtJambiInterface

Direct Known Subclasses:
  QHBoxLayout, QVBoxLayout

    public class QBoxLayout

extends QLayout

The QBoxLayout class lines up child widgets horizontally or vertically. QBoxLayout takes the space it gets (from its parent layout or from the `parentWidget()`), divides it up into a row of boxes, and makes each managed widget fill one box.

If the QBoxLayout's orientation is `Qt::Horizontal` the boxes are placed in a row, with suitable sizes. Each widget (or other box) will get at least its minimum size and at most its maximum size. Any excess space is shared according to the stretch factors (more about that below).
If the QBoxLayout's orientation is `Qt::Vertical` , the boxes are placed in a column, again with suitable sizes.

The easiest way to create a QBoxLayout is to use one of the convenience classes, e.g. `QHBoxLayout` (for `Qt::Horizontal` boxes) or `QVBoxLayout` (for `Qt::Vertical` boxes). You can also use the QBoxLayout constructor directly, specifying its direction as `LeftToRight` , `RightToLeft` , `TopToBottom` , or `BottomToTop` .

If the QBoxLayout is not the top-level layout (i.e. it is not managing all of the widget's area and children), you must add it to its parent layout before you can do anything with it. The normal way to add a layout is by calling parentLayout->`addLayout()`.

Once you have done this, you can add boxes to the QBoxLayout using one of four functions:

- `addWidget()` to add a widget to the QBoxLayout and set the widget's stretch factor. (The stretch factor is along the row of boxes.)
- `addSpacing()` to create an empty box; this is one of the functions you use to create nice and spacious dialogs. See below for ways to set margins.
- `addStretch()` to create an empty, stretchable box.
- `addLayout()` to add a box containing another `QLayout` to the row and set that layout's stretch factor.

Use `insertWidget()`, `insertSpacing()`, `insertStretch()` or `insertLayout()` to insert a box at a specified position in the layout.

QBoxLayout also includes two margin widths:

- `setContentsMargins()` sets the width of the outer border on each side of the widget. This is the width of the reserved space along each of the QBoxLayout's four sides.
- `setSpacing()` sets the width between neighboring boxes. (You can use `addSpacing()` to get more space at a particular spot.)

The margin default is provided by the style. The default margin most Qt styles specify is 9 for child widgets and 11 for windows. The spacing defaults to the same as the margin width for a top-level layout, or to the same as the parent layout.

To remove a widget from a layout, call `removeWidget()`. Calling `QWidget::hide()` on a widget also effectively removes the widget from the layout until `QWidget::show()` is called.

You will almost always want to use `QVBoxLayout` and `QHBoxLayout` rather than QBoxLayout because of their convenient constructors.

See also:
  `QGridLayout`, `QStackedLayout`, and Layout Classes.

Nested Class Summary
`static class` | `QBoxLayout.Direction` This type is used to determine the direction of a box layout.

Nested classes/interfaces inherited from class com.trolltech.qt.gui.QLayout
`QLayout.SizeConstraint`

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
`QBoxLayout(QBoxLayout.Direction arg__1)` Constructs a new QBoxLayout with direction `dir` and parent widget `parent`.
`QBoxLayout(QBoxLayout.Direction arg__1, QWidget parent)` Constructs a new QBoxLayout with direction `dir` and parent widget `parent`.

Method Summary
`void` | `addLayout(QLayout layout)` Adds `layout` to the end of the box, with serial stretch factor `stretch`.
`void` | `addLayout(QLayout layout, int stretch)` Adds `layout` to the end of the box, with serial stretch factor `stretch`.
`void` | `addSpacerItem(QSpacerItem spacerItem)` Adds `spacerItem` to the end of this box layout.
`void` | `addSpacing(int size)` Adds a non-stretchable space (a `QSpacerItem`) with size `size` to the end of this box layout.
`void` | `addStretch()` Adds a stretchable space (a `QSpacerItem`) with zero minimum size and stretch factor `stretch` to the end of this box layout.
`void` | `addStretch(int stretch)` Adds a stretchable space (a `QSpacerItem`) with zero minimum size and stretch factor `stretch` to the end of this box layout.
`void` | `addStrut(int arg__1)` Limits the perpendicular dimension of the box (e.
`void` | `addWidget(QWidget arg__1, int stretch, Qt.Alignment alignment)` Adds `widget` to the end of this box layout, with a stretch factor of `stretch` and alignment `alignment`.
`void` | `addWidget(QWidget arg__1, int stretch, Qt.AlignmentFlag[] alignment)`
`QBoxLayout.Direction` | `direction()` Returns the direction of the box.
`protected void` | `insertItem(int index, QLayoutItemInterface arg__2)` Inserts `item` into this box layout at position `index`.
`void` | `insertLayout(int index, QLayout layout)` Inserts `layout` at position `index`, with stretch factor `stretch`.
`void` | `insertLayout(int index, QLayout layout, int stretch)` Inserts `layout` at position `index`, with stretch factor `stretch`.
`void` | `insertSpacerItem(int index, QSpacerItem spacerItem)` Inserts `spacerItem` at position `index`, with zero minimum size and stretch factor.
`void` | `insertSpacing(int index, int size)` Inserts a non-stretchable space (a `QSpacerItem`) at position `index`, with size `size`.
`void` | `insertStretch(int index)` Inserts a stretchable space (a `QSpacerItem`) at position `index`, with zero minimum size and stretch factor `stretch`.
`void` | `insertStretch(int index, int stretch)` Inserts a stretchable space (a `QSpacerItem`) at position `index`, with zero minimum size and stretch factor `stretch`.
`void` | `insertWidget(int index, QWidget widget)` Inserts `widget` at position `index`, with stretch factor `stretch` and alignment `alignment`.
`void` | `insertWidget(int index, QWidget widget, int stretch)` Inserts `widget` at position `index`, with stretch factor `stretch` and alignment `alignment`.
`void` | `insertWidget(int index, QWidget widget, int stretch, Qt.Alignment alignment)` Inserts `widget` at position `index`, with stretch factor `stretch` and alignment `alignment`.
`void` | `insertWidget(int index, QWidget widget, int stretch, Qt.AlignmentFlag[] alignment)`
`void` | `setDirection(QBoxLayout.Direction arg__1)` Sets the direction of this layout to `direction`.
`void` | `setSpacing(int spacing)` Reimplements QLayout.:setSpacing().
`boolean` | `setStretchFactor(QLayout l, int stretch)` Sets the stretch factor for the layout `layout` to `stretch` and returns true if `layout` is found in this layout (not including child layouts); otherwise returns false.
`boolean` | `setStretchFactor(QWidget w, int stretch)` Sets the stretch factor for `widget` to `stretch` and returns true if `widget` is found in this layout (not including child layouts); otherwise returns false.
`int` | `spacing()` Reimplements QLayout.:spacing().

Methods inherited from class com.trolltech.qt.gui.QLayout
`activate, addChildLayout, addChildWidget, addItem, addWidget, alignment, alignmentRect, closestAcceptableSize, contentsRect, controlTypes, count, expandingDirections, geometry, getContentsMargins, hasHeightForWidth, heightForWidth, indexOf, invalidate, isEmpty, isEnabled, itemAt, layout, maximumSize, menuBar, minimumHeightForWidth, minimumSize, parentWidget, removeItem, removeWidget, setAlignment, setAlignment, setAlignment, setAlignment, setAlignment, setContentsMargins, setContentsMargins, setEnabled, setGeometry, setMargin, setMenuBar, setSizeConstraint, setWidgetSpacing, sizeConstraint, sizeHint, spacerItem, takeAt, update, widget, widgetSpacing`

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`

Constructor Detail

### QBoxLayout

    public QBoxLayout(QBoxLayout.Direction arg__1)

  Constructs a new QBoxLayout with direction `dir` and parent widget `parent`.

See also:
  `direction()`.

### QBoxLayout

    public QBoxLayout(QBoxLayout.Direction arg__1,
                      QWidget parent)

  Constructs a new QBoxLayout with direction `dir` and parent widget `parent`.

See also:
  `direction()`.

Method Detail

### addLayout

    public final void addLayout(QLayout layout)

  Adds `layout` to the end of the box, with serial stretch factor `stretch`.

See also:
  `insertLayout()`, `addItem()`, and `addWidget()`.

### addLayout

    public final void addLayout(QLayout layout,
                                int stretch)

  Adds `layout` to the end of the box, with serial stretch factor `stretch`.

See also:
  `insertLayout()`, `addItem()`, and `addWidget()`.

### addSpacerItem

    public final void addSpacerItem(QSpacerItem spacerItem)

  Adds `spacerItem` to the end of this box layout.

See also:
  `addSpacing()`, and `addStretch()`.

### addSpacing

    public final void addSpacing(int size)

  Adds a non-stretchable space (a `QSpacerItem`) with size `size` to the end of this box layout. QBoxLayout provides default margin and spacing. This function adds additional space.

See also:
  `insertSpacing()`, `addItem()`, and `QSpacerItem`.

### addStretch

    public final void addStretch()

  Adds a stretchable space (a `QSpacerItem`) with zero minimum size and stretch factor `stretch` to the end of this box layout.

See also:
  `insertStretch()`, `addItem()`, and `QSpacerItem`.

### addStretch

    public final void addStretch(int stretch)

  Adds a stretchable space (a `QSpacerItem`) with zero minimum size and stretch factor `stretch` to the end of this box layout.

See also:
  `insertStretch()`, `addItem()`, and `QSpacerItem`.

### addStrut

    public final void addStrut(int arg__1)

  Limits the perpendicular dimension of the box (e. . height if the box is `LeftToRight` ) to a minimum of `size`. Other constraints may increase the limit.

See also:
  `addItem()`.

### addWidget

    public final void addWidget(QWidget arg__1,
                                int stretch,
                                Qt.AlignmentFlag[] alignment)

### addWidget

    public final void addWidget(QWidget arg__1,
                                int stretch,
                                Qt.Alignment alignment)

  Adds `widget` to the end of this box layout, with a stretch factor of `stretch` and alignment `alignment`.

  The stretch factor applies only in the `direction` of the QBoxLayout, and is relative to the other boxes and widgets in this QBoxLayout. Widgets and boxes with higher stretch factors grow more.

  If the stretch factor is 0 and nothing else in the QBoxLayout has a stretch factor greater than zero, the space is distributed according to the `QWidget`:sizePolicy() of each widget that's involved.

  The alignment is specified by `alignment`. The default alignment is 0, which means that the widget fills the entire cell.

See also:
  `insertWidget()`, `addItem()`, `addLayout()`, `addStretch()`, `addSpacing()`, and `addStrut()`.

### direction

    public final QBoxLayout.Direction direction()

  Returns the direction of the box. `addWidget()` and `addSpacing()` work in this direction; the stretch stretches in this direction.

See also:
  `setDirection()`, `QBoxLayout::Direction` , `addWidget()`, and `addSpacing()`.

### insertItem

    protected final void insertItem(int index,
                                    QLayoutItemInterface arg__2)

  Inserts `item` into this box layout at position `index`. If `index` is negative, the item is added at the end.

See also:
  `addItem()`, `insertWidget()`, `insertLayout()`, `insertStretch()`, and `insertSpacing()`.

### insertLayout

    public final void insertLayout(int index,
                                   QLayout layout)

  Inserts `layout` at position `index`, with stretch factor `stretch`. If `index` is negative, the layout is added at the end.

  `layout` becomes a child of the box layout.

See also:
  `addLayout()`, and `insertItem()`.

### insertLayout

    public final void insertLayout(int index,
                                   QLayout layout,
                                   int stretch)

  Inserts `layout` at position `index`, with stretch factor `stretch`. If `index` is negative, the layout is added at the end.

  `layout` becomes a child of the box layout.

See also:
  `addLayout()`, and `insertItem()`.

### insertSpacerItem

    public final void insertSpacerItem(int index,
                                       QSpacerItem spacerItem)

  Inserts `spacerItem` at position `index`, with zero minimum size and stretch factor. If `index` is negative the space is added at the end.

See also:
  `addSpacerItem()`, `insertStretch()`, and `insertSpacing()`.

### insertSpacing

    public final void insertSpacing(int index,
                                    int size)

  Inserts a non-stretchable space (a `QSpacerItem`) at position `index`, with size `size`. If `index` is negative the space is added at the end.

  The box layout has default margin and spacing. This function adds additional space.

See also:
  `addSpacing()`, `insertItem()`, and `QSpacerItem`.

### insertStretch

    public final void insertStretch(int index)

  Inserts a stretchable space (a `QSpacerItem`) at position `index`, with zero minimum size and stretch factor `stretch`. If `index` is negative the space is added at the end.

See also:
  `addStretch()`, `insertItem()`, and `QSpacerItem`.

### insertStretch

    public final void insertStretch(int index,
                                    int stretch)

  Inserts a stretchable space (a `QSpacerItem`) at position `index`, with zero minimum size and stretch factor `stretch`. If `index` is negative the space is added at the end.

See also:
  `addStretch()`, `insertItem()`, and `QSpacerItem`.

### insertWidget

    public final void insertWidget(int index,
                                   QWidget widget,
                                   int stretch,
                                   Qt.AlignmentFlag[] alignment)

### insertWidget

    public final void insertWidget(int index,
                                   QWidget widget,
                                   int stretch)

  Inserts `widget` at position `index`, with stretch factor `stretch` and alignment `alignment`. If `index` is negative, the widget is added at the end.

  The stretch factor applies only in the `direction` of the QBoxLayout, and is relative to the other boxes and widgets in this QBoxLayout. Widgets and boxes with higher stretch factors grow more.

  If the stretch factor is 0 and nothing else in the QBoxLayout has a stretch factor greater than zero, the space is distributed according to the `QWidget`:sizePolicy() of each widget that's involved.

  The alignment is specified by `alignment`. The default alignment is 0, which means that the widget fills the entire cell.

See also:
  `addWidget()`, and `insertItem()`.

### insertWidget

    public final void insertWidget(int index,
                                   QWidget widget)

  Inserts `widget` at position `index`, with stretch factor `stretch` and alignment `alignment`. If `index` is negative, the widget is added at the end.

  The stretch factor applies only in the `direction` of the QBoxLayout, and is relative to the other boxes and widgets in this QBoxLayout. Widgets and boxes with higher stretch factors grow more.

  If the stretch factor is 0 and nothing else in the QBoxLayout has a stretch factor greater than zero, the space is distributed according to the `QWidget`:sizePolicy() of each widget that's involved.

  The alignment is specified by `alignment`. The default alignment is 0, which means that the widget fills the entire cell.

See also:
  `addWidget()`, and `insertItem()`.

### insertWidget

    public final void insertWidget(int index,
                                   QWidget widget,
                                   int stretch,
                                   Qt.Alignment alignment)

  Inserts `widget` at position `index`, with stretch factor `stretch` and alignment `alignment`. If `index` is negative, the widget is added at the end.

  The stretch factor applies only in the `direction` of the QBoxLayout, and is relative to the other boxes and widgets in this QBoxLayout. Widgets and boxes with higher stretch factors grow more.

  If the stretch factor is 0 and nothing else in the QBoxLayout has a stretch factor greater than zero, the space is distributed according to the `QWidget`:sizePolicy() of each widget that's involved.

  The alignment is specified by `alignment`. The default alignment is 0, which means that the widget fills the entire cell.

See also:
  `addWidget()`, and `insertItem()`.

### setDirection

    public final void setDirection(QBoxLayout.Direction arg__1)

  Sets the direction of this layout to `direction`.

See also:
  `direction()`.

### setSpacing

    public final void setSpacing(int spacing)

  Reimplements QLayout.:setSpacing(). Sets the spacing property to `spacing`.

See also:
  QLayout::setSpacing(), and `spacing()`.

### setStretchFactor

    public final boolean setStretchFactor(QLayout l,
                                          int stretch)

  Sets the stretch factor for the layout `layout` to `stretch` and returns true if `layout` is found in this layout (not including child layouts); otherwise returns false.

### setStretchFactor

    public final boolean setStretchFactor(QWidget w,
                                          int stretch)

  Sets the stretch factor for `widget` to `stretch` and returns true if `widget` is found in this layout (not including child layouts); otherwise returns false.

See also:
  `setAlignment()`.

### spacing

    public final int spacing()

  Reimplements QLayout.:spacing(). If the spacing property is valid, that value is returned. Otherwise, a value for the spacing property is computed and returned. Since layout spacing in a widget is style dependent, if the parent is a widget, it queries the style for the (horizontal or vertical) spacing of the layout. Otherwise, the parent is a layout, and it queries the parent layout for the `spacing()`.

See also:
  QLayout::spacing(), and `setSpacing()`.

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