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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6.8.2
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None
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macOS
Description
If the mouse pointer is moved over a QWindow towards the edge, and then the window is resized by that edge, neither QEvent::Leave nor QEvent::MouseMove are delivered during the resize. This only happens if the mouse motion doesn't overshoot the window edge.
In effect, the window redraws as-if the mouse pointer was at the spot where it has left the window, causing invalid "hover" appearance.
Here is an example which demonstrates the issue in QML.
import QtQuick
Window {
id: win
width: 300
height: 300
visible: true
Row {
Repeater {
model: 4
Rectangle {
width: win.width/4
height: win.height
color: Qt.lighter(Qt.rgba(0.5,index/3,0,1),ma.containsMouse ?2.0:1.0)
MouseArea {
anchors.fill: parent
id: ma
hoverEnabled: true
}
}
}
}}
The underlying issue can be demonstrated at the QWindow level using the following example. When the window is resized by following the procedure outlined above, neither "Leave" nor "Mouse" debug output is produced.
#include <QGuiApplication> #include <QWindow> #include <QMouseEvent> #include <QDebug> class MyWindow:public QWindow { public: bool event(QEvent *ev) override { if(ev->type() == QEvent::Enter) { qDebug() << "Enter"; } if(ev->type() == QEvent::Leave) { qDebug() << "Leave"; } if(ev->type() == QEvent::MouseMove) { auto mev = static_cast<QMouseEvent*>(ev); qDebug() << "Mouse" << mev->position(); } return QWindow::event(ev); } }; int main(int ac, char ** av) { QGuiApplication app(ac, av); MyWindow w; w.show(); app.exec(); return 0; }