QSGOpacityNode 類

The QSGOpacityNode class is used to change opacity of nodes. 更多...

頭：	#include <QSGOpacityNode>
qmake:	QT += quick
繼承：	QSGNode

所有成員列錶，包括繼承成員

公共函數

	QSGOpacityNode ()
virtual	~QSGOpacityNode () override
qreal	opacity () const
void	setOpacity (qreal opacity )

20 公共函數繼承自 QSGNode

詳細描述

The QSGOpacityNode class is used to change opacity of nodes.

Opacity applies to its subtree and can be nested. Multiple opacity nodes will be accumulated by multiplying their opacity. The accumulation happens as part of the rendering.

When nested opacity gets below a certain threshold, the subtree might be marked as blocked, causing isSubtreeBlocked () to return true. This is done for performance reasons.

注意： 所有帶有 QSG 前綴的類隻應用於場景圖形渲染綫程。見場景圖形和渲染瞭解更多信息。

成員函數文檔編製

QSGOpacityNode:: QSGOpacityNode ()

Constructs an opacity node with a default opacity of 1.

Opacity accumulates downwards in the scene graph so a node with two QSGOpacityNode instances above it, both with opacity of 0.5, will have effective opacity of 0.25.

節點的默認不透明度為 1。

`[override virtual]` QSGOpacityNode:: ~QSGOpacityNode ()

刪除不透明度節點。

qreal QSGOpacityNode:: opacity () const

返迴此不透明度節點的不透明度。

另請參閱 setOpacity ().

void QSGOpacityNode:: setOpacity ( qreal opacity )

Sets the opacity of this node to opacity .

Before rendering the graph, the renderer will do an update pass over the subtree to propagate the opacity to its children.

The value will be bounded to the range 0 to 1.

另請參閱 opacity ().

內容