QDockWidget Class Reference
^{[QtGui module]}

Appearance

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 wether it is docked; a docked QDockWidget has no frame and a smaller title bar.

See also QMainWindow and Dock Widgets Example.

Member Type Documentation

enum QDockWidget::DockWidgetFeature
flags QDockWidget::DockWidgetFeatures

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

Property Documentation

allowedAreas : Qt::DockWidgetAreas

This property holds areas where the dock widget may be placed.

The default is Qt::AllDockWidgetAreas.

Access functions:

• Qt::DockWidgetAreas allowedAreas () const
• void setAllowedAreas ( Qt::DockWidgetAreas areas )

See also Qt::DockWidgetArea.

features : DockWidgetFeatures

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

Access functions:

• DockWidgetFeatures features () const
• void setFeatures ( DockWidgetFeatures features )

See also DockWidgetFeature.

floating : bool

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.

Access functions:

• bool isFloating () const
• void setFloating ( bool floating )

See also isWindow().

Member Function Documentation

QDockWidget::QDockWidget ( const QString & title, QWidget * parent = 0, Qt::WindowFlags flags = 0 )

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.

See also setWindowTitle().

QDockWidget::QDockWidget ( QWidget * parent = 0, Qt::WindowFlags flags = 0 )

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

QDockWidget::~QDockWidget ()

Destroys the dock widget.

void QDockWidget::allowedAreasChanged ( Qt::DockWidgetAreas allowedAreas )   [signal]

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

void QDockWidget::dockLocationChanged ( Qt::DockWidgetArea area )   [signal]

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.

This function was introduced in Qt 4.3.

void QDockWidget::featuresChanged ( QDockWidget::DockWidgetFeatures features )   [signal]

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

void QDockWidget::initStyleOption ( QStyleOptionDockWidget * option ) const   [protected]

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.

See also QStyleOption::initFrom().

bool QDockWidget::isAreaAllowed ( Qt::DockWidgetArea area ) const

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

void QDockWidget::setTitleBarWidget ( QWidget * widget )

Sets an arbitrary widget as the dock widget's title bar. If widget is 0, the title bar widget is removed, but not deleted.

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:

   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.

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.

This function was introduced in Qt 4.3.

See also titleBarWidget() and DockWidgetVerticalTitleBar.

void QDockWidget::setWidget ( QWidget * widget )

Sets the widget for the dock widget to widget.

See also widget().

QWidget * QDockWidget::titleBarWidget () const

Returns the custom title bar widget set on the QDockWidget, or 0 if no custom title bar has been set.

This function was introduced in Qt 4.3.

See also setTitleBarWidget().

QAction * QDockWidget::toggleViewAction () const

Returns a checkable action that can be used to show or close this dock widget.

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

See also QAction::text and QWidget::windowTitle.

void QDockWidget::topLevelChanged ( bool topLevel )   [signal]

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.

See also isWindow().

void QDockWidget::visibilityChanged ( bool visible )   [signal]

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.

This function was introduced in Qt 4.3.

QWidget * QDockWidget::widget () const

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

See also setWidget().