将背景图片添加到 QQuickItem [英] Adding a background image to a QQuickItem
本文介绍了将背景图片添加到 QQuickItem的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我创建了一个 QPixmap
并使用 QPainter
在其上绘制了较小的 QPixmap
.我想使用图像作为 QQuickItem
的背景.是否有捷径可寻?
I have created a QPixmap
and drawn smaller QPixmap
s on it with QPainter
. I want to use the image as the background of a QQuickItem
. Is there an easy way to do this?
推荐答案
如果你的自定义项派生自 QQuickItem
你可以重新定义 QQuickItem::updatePaintNode()
在也许这个方式:
If your custom item derived from QQuickItem
you can redefine QQuickItem::updatePaintNode()
in maybe this way:
QSGNode *MyItem::updatePaintNode(QSGNode *oldNode, QQuickItem::UpdatePaintNodeData *)
{
QSGSimpleTextureNode *node = static_cast<QSGSimpleTextureNode *>(oldNode);
if (!node) {
node = new QSGSimpleTextureNode();
QSGTexture *texture = window()->createTextureFromImage(m_pixmap.toImage());
node->setTexture(texture);
}
node->setRect(boundingRect());
return node;
}
注意:你的物品是 QSGTexture *texture
的所有者,不要忘记在对象销毁时删除它.
Pay attention: your item is owner of QSGTexture *texture
, don't forget to delete it while object destruction.
这篇关于将背景图片添加到 QQuickItem的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!
查看全文