From 3af7b279177f7fb092f0e0fb9ffc8e8d846ed774 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Morten=20Johan=20S=C3=B8rvig?= Date: Wed, 30 Jan 2019 13:55:15 +0100 Subject: Fix QWindow::mapToGlobal()/mapFromGlobal() for multi-screen windows Make these functions handle the case where a window spans multiple screens, and high-DPI scaling is enabled, and the local position (in the window) is not on the window primary screen (as returned by QWindow::screen()). This is done by detecting the case, and then calculating the correct position using the native coordinate system. [ChangeLog][QtGui] QWindow::mapToGlobal()/mapFromGlobal() now handle windows spanning screens correctly. Done-with: Friedemann Kleint Task-number: QTBUG-73231 Change-Id: I3c31b741344d9e85e4f5d9e60bae75acce2db741 Reviewed-by: Friedemann Kleint --- src/gui/kernel/qhighdpiscaling.cpp | 42 ++++++++++++++++++++++++++++++++++++++ src/gui/kernel/qhighdpiscaling_p.h | 4 +++- src/gui/kernel/qwindow.cpp | 12 +++++++++-- src/gui/kernel/qwindow_p.h | 2 +- 4 files changed, 56 insertions(+), 4 deletions(-) (limited to 'src') diff --git a/src/gui/kernel/qhighdpiscaling.cpp b/src/gui/kernel/qhighdpiscaling.cpp index 22e46e0851..4b85973e92 100644 --- a/src/gui/kernel/qhighdpiscaling.cpp +++ b/src/gui/kernel/qhighdpiscaling.cpp @@ -41,7 +41,9 @@ #include "qguiapplication.h" #include "qscreen.h" #include "qplatformintegration.h" +#include "qplatformwindow.h" #include "private/qscreen_p.h" +#include #include @@ -376,6 +378,46 @@ QPoint QHighDpiScaling::mapPositionFromNative(const QPoint &pos, const QPlatform return (pos - topLeft) / scaleFactor + topLeft; } +QPoint QHighDpiScaling::mapPositionToGlobal(const QPoint &pos, const QPoint &windowGlobalPosition, const QWindow *window) +{ + QPoint globalPosCandidate = pos + windowGlobalPosition; + if (QGuiApplicationPrivate::screen_list.size() <= 1) + return globalPosCandidate; + + // The global position may be outside device independent screen geometry + // in cases where a window spans screens. Detect this case and map via + // native coordinates to the correct screen. + auto currentScreen = window->screen(); + if (currentScreen && !currentScreen->geometry().contains(globalPosCandidate)) { + auto nativeGlobalPos = QHighDpi::toNativePixels(globalPosCandidate, currentScreen); + if (auto actualPlatformScreen = currentScreen->handle()->screenForPosition(nativeGlobalPos)) + return QHighDpi::fromNativePixels(nativeGlobalPos, actualPlatformScreen->screen()); + } + + return globalPosCandidate; +} + +QPoint QHighDpiScaling::mapPositionFromGlobal(const QPoint &pos, const QPoint &windowGlobalPosition, const QWindow *window) +{ + QPoint windowPosCandidate = pos - windowGlobalPosition; + if (QGuiApplicationPrivate::screen_list.size() <= 1) + return windowPosCandidate; + + // Device independent global (screen) space may discontiguous when high-dpi scaling + // is active. This means that the normal subtracting of the window global position from the + // position-to-be-mapped may not work in cases where a window spans multiple screens. + // Map both positions to native global space (using the correct screens), subtract there, + // and then map the difference back using the scale factor for the window. + QScreen *posScreen = QGuiApplication::screenAt(pos); + if (posScreen && posScreen != window->screen()) { + QPoint nativePos = QHighDpi::toNativePixels(pos, posScreen); + QPoint windowNativePos = window->handle()->geometry().topLeft(); + return QHighDpi::fromNativeLocalPosition(nativePos - windowNativePos, window); + } + + return windowPosCandidate; +} + qreal QHighDpiScaling::screenSubfactor(const QPlatformScreen *screen) { qreal factor = qreal(1.0); diff --git a/src/gui/kernel/qhighdpiscaling_p.h b/src/gui/kernel/qhighdpiscaling_p.h index 83fc9452c5..28cf7de75b 100644 --- a/src/gui/kernel/qhighdpiscaling_p.h +++ b/src/gui/kernel/qhighdpiscaling_p.h @@ -83,8 +83,10 @@ public: static qreal factor(const QPlatformScreen *platformScreen); static QPoint origin(const QScreen *screen); static QPoint origin(const QPlatformScreen *platformScreen); - static QPoint mapPositionFromNative(const QPoint &pos, const QPlatformScreen *platformScreen); static QPoint mapPositionToNative(const QPoint &pos, const QPlatformScreen *platformScreen); + static QPoint mapPositionFromNative(const QPoint &pos, const QPlatformScreen *platformScreen); + static QPoint mapPositionToGlobal(const QPoint &pos, const QPoint &windowGlobalPosition, const QWindow *window); + static QPoint mapPositionFromGlobal(const QPoint &pos, const QPoint &windowGlobalPosition, const QWindow *window); static QDpi logicalDpi(); private: diff --git a/src/gui/kernel/qwindow.cpp b/src/gui/kernel/qwindow.cpp index 453aa1ed83..bcd8351619 100644 --- a/src/gui/kernel/qwindow.cpp +++ b/src/gui/kernel/qwindow.cpp @@ -1670,9 +1670,9 @@ void QWindow::setGeometry(const QRect &rect) chicken and egg problem here: we cannot convert to native coordinates before we know which screen we are on. */ -QScreen *QWindowPrivate::screenForGeometry(const QRect &newGeometry) +QScreen *QWindowPrivate::screenForGeometry(const QRect &newGeometry) const { - Q_Q(QWindow); + Q_Q(const QWindow); QScreen *currentScreen = q->screen(); QScreen *fallback = currentScreen; QPoint center = newGeometry.center(); @@ -2542,6 +2542,10 @@ QPoint QWindow::mapToGlobal(const QPoint &pos) const && (d->platformWindow->isForeignWindow() || d->platformWindow->isEmbedded())) { return QHighDpi::fromNativeLocalPosition(d->platformWindow->mapToGlobal(QHighDpi::toNativeLocalPosition(pos, this)), this); } + + if (QHighDpiScaling::isActive()) + return QHighDpiScaling::mapPositionToGlobal(pos, d->globalPosition(), this); + return pos + d->globalPosition(); } @@ -2562,6 +2566,10 @@ QPoint QWindow::mapFromGlobal(const QPoint &pos) const && (d->platformWindow->isForeignWindow() || d->platformWindow->isEmbedded())) { return QHighDpi::fromNativeLocalPosition(d->platformWindow->mapFromGlobal(QHighDpi::toNativeLocalPosition(pos, this)), this); } + + if (QHighDpiScaling::isActive()) + return QHighDpiScaling::mapPositionFromGlobal(pos, d->globalPosition(), this); + return pos - d->globalPosition(); } diff --git a/src/gui/kernel/qwindow_p.h b/src/gui/kernel/qwindow_p.h index 5103d97c6d..745890f63f 100644 --- a/src/gui/kernel/qwindow_p.h +++ b/src/gui/kernel/qwindow_p.h @@ -148,7 +148,7 @@ public: void connectToScreen(QScreen *topLevelScreen); void disconnectFromScreen(); void emitScreenChangedRecursion(QScreen *newScreen); - QScreen *screenForGeometry(const QRect &rect); + QScreen *screenForGeometry(const QRect &rect) const; virtual void clearFocusObject(); virtual QRectF closestAcceptableGeometry(const QRectF &rect) const; -- cgit v1.2.3