内容

• 公共函数
• 公共槽
• 重实现保护函数
• 详细描述

QPaintDeviceWindow 类

方便子类化的 QWindow 也是 QPaintDevice . 更多...

头：	#include <QPaintDeviceWindow>
CMake:	find_package(Qt6 COMPONENTS Gui REQUIRED) target_link_libraries(mytarget PRIVATE Qt6::Gui)
qmake:	QT += gui
Since:	Qt 5.4
继承：	QWindow and QPaintDevice
继承者：	QOpenGLWindow and QRasterWindow

• 所有成员列表，包括继承成员

公共函数

void	update (const QRect & rect )
void	update (const QRegion & region )

公共槽

void

update ()

重实现保护函数

virtual void

paintEvent (QPaintEvent * event ) override

详细描述

QPaintDeviceWindow 像常规 QWindow , with the added functionality of being a paint device too. Whenever the content needs to be updated, the virtual paintEvent () function is called. Subclasses, that reimplement this function, can then simply open a QPainter on the window.

注意： 此类不能直接被用于应用程序。它宁愿充当子类的基，像 QOpenGLWindow .

另请参阅 QOpenGLWindow .

成员函数文档编制

[slot] void QPaintDeviceWindow:: update ()

Marks the entire window as dirty and schedules a repaint.

注意： Subsequent calls to this function before the next paint event will get ignored.

注意： For non-exposed windows the update is deferred until the window becomes exposed again.

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

重实现： QWindow::paintEvent (QPaintEvent *ev).

处理描绘事件传入的 event 参数。

The default implementation does nothing. Reimplement this function to perform painting. If necessary, the dirty area is retrievable from the event .

void QPaintDeviceWindow:: update (const QRect & rect )

Marks the rect of the window as dirty and schedules a repaint.

注意： Subsequent calls to this function before the next paint event will get ignored, but rect is added to the region to update.

注意： For non-exposed windows the update is deferred until the window becomes exposed again.

void QPaintDeviceWindow:: update (const QRegion & region )

Marks the region of the window as dirty and schedules a repaint.

注意： Subsequent calls to this function before the next paint event will get ignored, but region is added to the region to update.

注意： For non-exposed windows the update is deferred until the window becomes exposed again.