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highdpi: fix map to/from global for "off-primary-screen" windows

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By "off-primary-screen" here I mean windows which are visible on
more than one screen, e.g. a secondary screen in addition
to the primary screen.

In this case the call to QHighDpi::toNativeGlobalPosition(pos, this)
problematic, since it uses the scale factor for the primary
screen, while pos might be on the secondary screen.

One way to fix this is to look up the correct scale factor
based on pos. Another way is to realize we don't have to
use scaling to get the native window position, and get
it from platformWindow geometry. This patch implements this
fix.

Fixes: QTBUG-106695
Change-Id: I03ffc261e199f65e54b06b964d067b6a9e0dd021
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
Reviewed-by: Tor Arne Vestbø <tor.arne.vestbo@qt.io>
This commit is contained in:
Morten Sørvig 2023-11-09 12:21:38 +01:00
parent 773f9ab018
commit 67fa2585ac
1 changed files with 2 additions and 2 deletions
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4
src/gui/kernel/qwindow.cpp
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@ -2850,7 +2850,7 @@ QPointF QWindow::mapToGlobal(const QPointF &pos) const
// Map the position (and the window's global position) to native coordinates, perform
// the addition, and then map back to device independent coordinates.
QPointF nativeLocalPos = QHighDpi::toNativeLocalPosition(pos, this);
QPointF nativeWindowGlobalPos = QHighDpi::toNativeGlobalPosition(QPointF(d->globalPosition()), this);
QPointF nativeWindowGlobalPos = d->platformWindow->mapToGlobal(QPoint(0,0)).toPointF();
QPointF nativeGlobalPos = nativeLocalPos + nativeWindowGlobalPos;
QPointF deviceIndependentGlobalPos = QHighDpi::fromNativeGlobalPosition(nativeGlobalPos, this);
return deviceIndependentGlobalPos;
@ -2888,7 +2888,7 @@ QPointF QWindow::mapFromGlobal(const QPointF &pos) const
// Calculate local position in the native coordinate system. (See comment for the
// corresponding mapToGlobal() code above).
QPointF nativeGlobalPos = QHighDpi::toNativeGlobalPosition(pos, this);
QPointF nativeWindowGlobalPos = QHighDpi::toNativeGlobalPosition(QPointF(d->globalPosition()), this);
QPointF nativeWindowGlobalPos = d->platformWindow->mapToGlobal(QPoint(0,0)).toPointF();
QPointF nativeLocalPos = nativeGlobalPos - nativeWindowGlobalPos;
QPointF deviceIndependentLocalPos = QHighDpi::fromNativeLocalPosition(nativeLocalPos, this);
return deviceIndependentLocalPos;