QDockWidget Class

A QDockWidget consists of a title bar and the content area. The title bar displays the dock widgets window title, a float button and a close button. Depending on the state of the QDockWidget, the float and close buttons may be either disabled or not shown at all.

The visual appearance of the title bar and buttons is dependent on the style in use.

A QDockWidget acts as a wrapper for its child widget, set with setWidget(). Custom size hints, minimum and maximum sizes and size policies should be implemented in the child widget. QDockWidget will respect them, adjusting its own constraints to include the frame and title. Size constraints should not be set on the QDockWidget itself, because they change depending on whether it is docked; a docked QDockWidget has no frame and a smaller title bar.

See also QMainWindow, Dock Widgets Example

flags QDockWidget::DockWidgetFeatures

The DockWidgetFeatures type is a typedef for QFlags<DockWidgetFeature>. It stores an OR combination of DockWidgetFeature values.

areas where the dock widget may be placed

The default is Qt::AllDockWidgetAreas.

Access functions:

• allowedAreas() const

• void setAllowedAreas( areas)

Notifier signal:

• void allowedAreasChanged( allowedAreas)

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This property holds whether the dock widget is movable, closable, and floatable

By default, this property is set to a combination of DockWidgetClosable, DockWidgetMovable and DockWidgetFloatable.

Access functions:

• features() const

• void setFeatures( features)

Notifier signal:

• void featuresChanged( features)

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This property holds whether the dock widget is floating

A floating dock widget is presented to the user as an independent window "on top" of its parent QMainWindow, instead of being docked in the QMainWindow.

By default, this property is true.

When this property changes, the topLevelChanged() signal is emitted.

Access functions:

• bool isFloating() const

• void setFloating(bool floating)

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This property holds the dock widget title (caption)

By default, this property contains an empty string.

Access functions:

• windowTitle() const

• void setWindowTitle(const QString &)

Notifier signal:

• void windowTitleChanged(const &title)

Constructs a QDockWidget with parent parent and window flags flags. The dock widget will be placed in the left dock widget area.

The window title is set to title. This title is used when the QDockWidget is docked and undocked. It is also used in the context menu provided by QMainWindow.

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Constructs a QDockWidget with parent parent and window flags flags. The dock widget will be placed in the left dock widget area.

Destroys the dock widget.

This signal is emitted when the allowedAreas property changes. The allowedAreas parameter gives the new value of the property.

Reimplements: QWidget::changeEvent(QEvent *event).

Reimplements: QWidget::closeEvent(QCloseEvent *event).

This signal is emitted when the dock widget is moved to another dock area, or is moved to a different location in its current dock area. This happens when the dock widget is moved programmatically or is dragged to a new location by the user.

Reimplements: QWidget::event(QEvent *event).

This signal is emitted when the features property changes. The features parameter gives the new value of the property.

Initialize option with the values from this QDockWidget. This method is useful for subclasses when they need a QStyleOptionDockWidget, but don't want to fill in all the information themselves.

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Returns true if this dock widget can be placed in the given area; otherwise returns false.

Reimplements: QWidget::paintEvent(QPaintEvent *event).

Sets an arbitrary widget as the dock widget's title bar. If widget is nullptr, any custom title bar widget previously set on the dock widget is removed, but not deleted, and the default title bar will be used instead.

If a title bar widget is set, QDockWidget will not use native window decorations when it is floated.

Here are some tips for implementing custom title bars:

• Mouse events that are not explicitly handled by the title bar widget must be ignored by calling QMouseEvent::ignore(). These events then propagate to the QDockWidget parent, which handles them in the usual manner, moving when the title bar is dragged, docking and undocking when it is double-clicked, etc.

• When DockWidgetVerticalTitleBar is set on QDockWidget, the title bar widget is repositioned accordingly. In resizeEvent(), the title bar should check what orientation it should assume:

   

  Sélectionnez

  QDockWidget *dockWidget = qobject_cast<QDockWidget*>(parentWidget());
  if (dockWidget->features() & QDockWidget::DockWidgetVerticalTitleBar) {
      // I need to be vertical
  } else {
      // I need to be horizontal
  }

• The title bar widget must have a valid QWidget::sizeHint() and QWidget::minimumSizeHint(). These functions should take into account the current orientation of the title bar.

• It is not possible to remove a title bar from a dock widget. However, a similar effect can be achieved by setting a default constructed QWidget as the title bar widget.

Using qobject_cast() as shown above, the title bar widget has full access to its parent QDockWidget. Hence it can perform such operations as docking and hiding in response to user actions.

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Sets the widget for the dock widget to widget.

If the dock widget is visible when widget is added, you must show() it explicitly.

Note that you must add the layout of the widget before you call this function; if not, the widget will not be visible.

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Returns the custom title bar widget set on the QDockWidget, or nullptr if no custom title bar has been set.

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Returns a checkable action that can be added to menus and toolbars so that the user can show or close this dock widget.

The action's text is set to the dock widget's window title.

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This signal is emitted when the floating property changes. The topLevel parameter is true if the dock widget is now floating; otherwise it is false.

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This signal is emitted when the dock widget becomes visible (or invisible). This happens when the widget is hidden or shown, as well as when it is docked in a tabbed dock area and its tab becomes selected or unselected.

Returns the widget for the dock widget. This function returns zero if the widget has not been set.

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