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chore: stop using QWheelEvent::delta()

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This commit is contained in:
Gary Wang 2020-07-12 23:45:49 +08:00
parent fb24e54579
commit c271fde194
1 changed files with 16 additions and 3 deletions
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19
mainwindow.cpp
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@ -349,10 +349,23 @@ void MainWindow::mouseDoubleClickEvent(QMouseEvent *event)
void MainWindow::wheelEvent(QWheelEvent *event)
{
if (event->delta() > 0) {
m_graphicsView->zoomView(1.25);
QPoint numDegrees = event->angleDelta() / 8;
bool needZoom = false, zoomIn = false;
// NOTE: Only checking angleDelta since the QWheelEvent::pixelDelta() doc says
// pixelDelta() value is driver specific and unreliable on X11...
// We are not scrolling the canvas, just zoom in or out, so it probably
// doesn't matter here.
if (!numDegrees.isNull() && numDegrees.y() != 0) {
needZoom = true;
zoomIn = numDegrees.y() > 0;
}
if (needZoom) {
m_graphicsView->zoomView(zoomIn ? 1.25 : 0.8);
event->accept();
} else {
m_graphicsView->zoomView(0.8);
QMainWindow::wheelEvent(event);
}
}