Details
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Bug
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Resolution: Unresolved
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P2: Important
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None
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5.6.0, 5.15.0
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None
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Windows 7
Windows 10
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Windows
Description
With the following code, the QWebEngineView window's background is not displayed transparently but in black when the window is set in full-screen display.
QWebEngineView view;
view.page()->setBackgroundColor(Qt::transparent);
view.setHtml("<html><div><p>Hello</p></div>"
"<style type=\"text\/css\">body {font-size: 7em;color: red;}"
"div {width: 100%;height: 100%;border: 25px solid blue;"
"text-align: center;background-color: transparent;pointer-events: none;}"
"</style></html>", QUrl("http://localhost"));
view.setAttribute(Qt::WA_TranslucentBackground);
view.setWindowState(Qt::WindowFullScreen);
view.setWindowFlags(Qt::FramelessWindowHint | Qt::BypassWindowManagerHint);
view.show();
If you comment out the line of "view.setWindowState(Qt::WindowFullScreen);", the transparent background was displayed correctly.
The issue is the same with QQuickWidget ( quickwidget.zip
):
QQuickWidget view;
view.setAttribute(Qt::WA_TranslucentBackground);
view.setClearColor(Qt::transparent);
view.setWindowFlags(Qt::FramelessWindowHint);
view.setWindowState(Qt::WindowFullScreen);
view.setResizeMode(QQuickWidget::SizeRootObjectToView);
view.setSource(QUrl("qrc:/test.qml"));
view.show();
Switching window by alt-tab makes it work. Probably refresh/repaint issue. It is not reproducible on Linux.