内容

• 公共类型
• 特性
• 公共函数
• 信号
• 保护函数
• 重实现保护函数
• 详细描述
• 外观

QDockWidget 类

The QDockWidget class provides a widget that can be docked inside a QMainWindow 或浮动在桌面上作为顶层窗口。 更多...

头：	#include <QDockWidget>
qmake:	QT += widgets
继承：	QWidget

• 所有成员列表，包括继承成员

公共类型

enum	DockWidgetFeature { DockWidgetClosable, DockWidgetMovable, DockWidgetFloatable, DockWidgetVerticalTitleBar, AllDockWidgetFeatures, NoDockWidgetFeatures }
flags	DockWidgetFeatures

特性

• allowedAreas : Qt::DockWidgetAreas
• features : DockWidgetFeatures
• floating : bool
• windowTitle : QString

• 59 特性继承自 QWidget
• 1 特性继承自 QObject

公共函数

	QDockWidget (const QString & title , QWidget * parent = Q_NULLPTR, Qt::WindowFlags flags = Qt::WindowFlags())
	QDockWidget (QWidget * parent = Q_NULLPTR, Qt::WindowFlags flags = Qt::WindowFlags())
	~QDockWidget ()
Qt::DockWidgetAreas	allowedAreas () const
DockWidgetFeatures	features () const
bool	isAreaAllowed (Qt::DockWidgetArea area ) const
bool	isFloating () const
void	setAllowedAreas (Qt::DockWidgetAreas areas )
void	setFeatures (DockWidgetFeatures features )
void	setFloating (bool floating )
void	setTitleBarWidget (QWidget * widget )
void	setWidget (QWidget * widget )
QWidget *	titleBarWidget () const
QAction *	toggleViewAction () const
QWidget *	widget () const

• 214 公共函数继承自 QWidget
• 32 公共函数继承自 QObject
• 14 公共函数继承自 QPaintDevice

信号

void	allowedAreasChanged (Qt::DockWidgetAreas allowedAreas )
void	dockLocationChanged (Qt::DockWidgetArea area )
void	featuresChanged (QDockWidget::DockWidgetFeatures features )
void	topLevelChanged (bool topLevel )
void	visibilityChanged (bool visible )

• 3 信号继承自 QWidget
• 2 信号继承自 QObject

保护函数

void	initStyleOption (QStyleOptionDockWidget * option ) const

重实现保护函数

virtual void	changeEvent (QEvent * event )
virtual void	closeEvent (QCloseEvent * event )
virtual bool	event (QEvent * event )
virtual void	paintEvent (QPaintEvent * event )

• 35 保护函数继承自 QWidget
• 9 保护函数继承自 QObject
• 1 保护函数继承自 QPaintDevice

额外继承成员

• 19 公共槽继承自 QWidget
• 1 公共槽继承自 QObject
• 5 静态公共成员继承自 QWidget
• 11 静态公共成员继承自 QObject
• 1 保护槽继承自 QWidget

详细描述

The QDockWidget class provides a widget that can be docked inside a QMainWindow 或浮动在桌面上作为顶层窗口。

QDockWidget provides the concept of dock widgets, also know as tool palettes or utility windows. Dock windows are secondary windows placed in the dock widget area around the central widget 在 QMainWindow .

Dock windows can be moved inside their current area, moved into new areas and floated (e.g., undocked) by the end-user. The QDockWidget API allows the programmer to restrict the dock widgets ability to move, float and close, as well as the areas in which they can be placed.

外观

A QDockWidget consists of a title bar and the content area. The title bar displays the dock widgets 窗口标题 ， float button and a close button. Depending on the state of the QDockWidget ， 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.

另请参阅 QMainWindow and 停放 Widget 范例 .

成员类型文档编制

enum QDockWidget:: DockWidgetFeature
flags QDockWidget:: DockWidgetFeatures

常量	值	描述
QDockWidget::DockWidgetClosable	0x01	The dock widget can be closed. On some systems the dock widget always has a close button when it's floating (for example on MacOS 10.5).
QDockWidget::DockWidgetMovable	0x02	The dock widget can be moved between docks by the user.
QDockWidget::DockWidgetFloatable	0x04	The dock widget can be detached from the main window, and floated as an independent window.
QDockWidget::DockWidgetVerticalTitleBar	0x08	The dock widget displays a vertical title bar on its left side. This can be used to increase the amount of vertical space in a QMainWindow .
QDockWidget::AllDockWidgetFeatures	DockWidgetClosable | DockWidgetMovable | DockWidgetFloatable	(Deprecated) The dock widget can be closed, moved, and floated. Since new features might be added in future releases, the look and behavior of dock widgets might change if you use this flag. Please specify individual flags instead.
QDockWidget::NoDockWidgetFeatures	0x00	The dock widget cannot be closed, moved, or floated.

DockWidgetFeatures 类型是 typedef 对于 QFlags <DockWidgetFeature>. It stores an OR combination of DockWidgetFeature values.

特性文档编制

allowedAreas : Qt::DockWidgetAreas

areas where the dock widget may be placed

默认为 Qt::AllDockWidgetAreas .

访问函数：

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

通知程序信号：

void	allowedAreasChanged (Qt::DockWidgetAreas allowedAreas )

另请参阅 Qt::DockWidgetArea .

features : DockWidgetFeatures

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 .

访问函数：

DockWidgetFeatures	features () const
void	setFeatures (DockWidgetFeatures features )

通知程序信号：

void	featuresChanged (QDockWidget::DockWidgetFeatures features )

另请参阅 DockWidgetFeature .

floating : bool

此特性保持停放 Widget 是否浮动

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 .

默认情况下，此特性为 true .

当此特性改变时， topLevelChanged() 信号被发射。

访问函数：

bool	isFloating () const
void	setFloating (bool floating )

另请参阅 isWindow () 和 topLevelChanged ().

windowTitle : QString

此特性保持停放 Widget 标题 (题注)

默认情况下，此特性包含空字符串。

访问函数：

QString	windowTitle () const
void	setWindowTitle ( const QString & )

通知程序信号：

void	windowTitleChanged (const QString & title )

成员函数文档编制

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

构造 QDockWidget 采用父级 parent 和窗口标志 flags . The dock widget will be placed in the left dock widget area.

窗口标题被设为 title . This title is used when the QDockWidget is docked and undocked. It is also used in the context menu provided by QMainWindow .

另请参阅 setWindowTitle ().

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

构造 QDockWidget 采用父级 parent 和窗口标志 flags . The dock widget will be placed in the left dock widget area.

QDockWidget:: ~QDockWidget ()

Destroys the dock widget.

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

此信号被发射当 allowedAreas 特性改变。 allowedAreas parameter gives the new value of the property.

注意： 通知程序信号对于特性 allowedAreas .

[virtual protected] void QDockWidget:: changeEvent ( QEvent * event )

重实现自 QWidget::changeEvent ().

[virtual protected] void QDockWidget:: closeEvent ( QCloseEvent * event )

重实现自 QWidget::closeEvent ().

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

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.

该函数在 Qt 4.3 引入。

[virtual protected] bool QDockWidget:: event ( QEvent * event )

重实现自 QObject::event ().

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

此信号被发射当 features 特性改变。 features parameter gives the new value of the property.

注意： 通知程序信号对于特性 features .

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

初始化 option 采用值来自此 QDockWidget 。此方法对子类是有用的，当需要 QStyleOptionDockWidget ，但不希望自己填充所有信息。

另请参阅 QStyleOption::initFrom ().

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

返回 true if this dock widget can be placed in the given area ；否则返回 false .

[virtual protected] void QDockWidget:: paintEvent ( QPaintEvent * event )

重实现自 QWidget::paintEvent ().

void QDockWidget:: setTitleBarWidget ( QWidget * widget )

Sets an arbitrary widget as the dock widget's title bar. If widget is 0, 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.
• 当 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 () 和 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.

使用 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.

该函数在 Qt 4.3 引入。

另请参阅 titleBarWidget () 和 DockWidgetVerticalTitleBar .

void QDockWidget:: setWidget ( QWidget * widget )

Sets the widget for the dock widget to widget .

If the dock widget is visible when widget 有添加，必须 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.

另请参阅 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.

该函数在 Qt 4.3 引入。

另请参阅 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.

另请参阅 QAction::text and QWidget::windowTitle .

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

此信号被发射当 floating 特性改变。 topLevel parameter is true if the dock widget is now floating; otherwise it is false.

另请参阅 isWindow ().

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

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.

该函数在 Qt 4.3 引入。

QWidget *QDockWidget:: widget () const

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

另请参阅 setWidget ().