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Windows QPA: Fix override cursor being cleared when crossing window borders

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Override cursors can be modified externally when for example crossing
window borders. Add helper function to enforce the cursor again to
QWindowsWindow::applyCursor() which is called for enter events.

Task-number: QTBUG-69637
Change-Id: Ibea4da9f2aac81377002b626daae64b1102f6c2b
Reviewed-by: Andre de la Rocha <andre.rocha@qt.io>
Reviewed-by: Oliver Wolff <oliver.wolff@qt.io>
This commit is contained in:
Friedemann Kleint 2018-07-30 09:09:03 +02:00
parent e386cd03d1
commit 46fc3d3729
3 changed files with 20 additions and 5 deletions
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16
src/plugins/platforms/windows/qwindowscursor.cpp
View File

@ -549,6 +549,7 @@ CursorHandlePtr QWindowsCursor::standardWindowCursor(Qt::CursorShape shape)
}
HCURSOR QWindowsCursor::m_overriddenCursor = nullptr;
HCURSOR QWindowsCursor::m_overrideCursor = nullptr;
/*!
\brief Return cached pixmap cursor or create new one.
@ -621,11 +622,20 @@ void QWindowsCursor::changeCursor(QCursor *cursorIn, QWindow *window)
}
}
// QTBUG-69637: Override cursors can get reset externally when moving across
// window borders. Enforce the cursor again (to be called from enter event).
void QWindowsCursor::enforceOverrideCursor()
{
if (hasOverrideCursor() && m_overrideCursor != GetCursor())
SetCursor(m_overrideCursor);
}
void QWindowsCursor::setOverrideCursor(const QCursor &cursor)
{
const CursorHandlePtr wcursor = cursorHandle(cursor);
if (wcursor->handle()) {
const HCURSOR previousCursor = SetCursor(wcursor->handle());
if (const auto overrideCursor = wcursor->handle()) {
m_overrideCursor = overrideCursor;
const HCURSOR previousCursor = SetCursor(overrideCursor);
if (m_overriddenCursor == nullptr)
m_overriddenCursor = previousCursor;
} else {
@ -638,7 +648,7 @@ void QWindowsCursor::clearOverrideCursor()
{
if (m_overriddenCursor) {
SetCursor(m_overriddenCursor);
m_overriddenCursor = nullptr;
m_overriddenCursor = m_overrideCursor = nullptr;
}
}

4
src/plugins/platforms/windows/qwindowscursor.h
View File

@ -107,7 +107,8 @@ public:
void changeCursor(QCursor * widgetCursor, QWindow * widget) override;
void setOverrideCursor(const QCursor &cursor) override;
void clearOverrideCursor() override;
bool hasOverrideCursor() const { return m_overriddenCursor != nullptr; }
static void enforceOverrideCursor();
static bool hasOverrideCursor() { return m_overriddenCursor != nullptr; }
QPoint pos() const override;
void setPos(const QPoint &pos) override;
@ -143,6 +144,7 @@ private:
mutable QPixmap m_ignoreDragCursor;
static HCURSOR m_overriddenCursor;
static HCURSOR m_overrideCursor;
};
QT_END_NAMESPACE

5
src/plugins/platforms/windows/qwindowswindow.cpp
View File

@ -2419,8 +2419,11 @@ static inline bool applyNewCursor(const QWindow *w)
void QWindowsWindow::applyCursor()
{
if (static_cast<const QWindowsCursor *>(screen()->cursor())->hasOverrideCursor())
if (QWindowsCursor::hasOverrideCursor()) {
if (isTopLevel())
QWindowsCursor::enforceOverrideCursor();
return;
}
#ifndef QT_NO_CURSOR
if (m_cursor->isNull()) { // Recurse up to parent with non-null cursor. Set default for toplevel.
if (const QWindow *p = window()->parent()) {