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Change to enter/leave policy while grabbing.

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Sending enter and leave events to other windows than the grabbing
window is not logical. The policy should be that only the grabbing
window receives enter and leave events.

Changed the documentation accordingly and provided the necessary
changes to Windows implementation.

Also removed explicit leave event generation for widgets when
popup is opened as that is now redundant.

tst_QWidget::underMouse() test was changed to behave according to
new logic.

Task-number: QTBUG-27871
Change-Id: I127fb8685b4a4206d1a319f42cba491ec02bc8ca
Reviewed-by: Oliver Wolff <oliver.wolff@digia.com>
Reviewed-by: Samuel Rødal <samuel.rodal@digia.com>
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@digia.com>
This commit is contained in:
Miikka Heikkinen 2012-11-09 15:57:07 +02:00 committed by The Qt Project
parent a6135c55b9
commit b8be2e67ea
5 changed files with 82 additions and 118 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

18
src/gui/kernel/qplatformwindow.cpp
View File

@ -466,12 +466,18 @@ bool QPlatformWindow::frameStrutEventsEnabled() const
\li Mouse grab: Qt expects windows to automatically grab the mouse if the user presses
a button until the button is released.
Automatic grab should be released if some window is explicitly grabbed.
\li Enter/Leave events: Enter and leave events should be sent independently of
explicit mouse grabs (\c{setMouseGrabEnabled()}). That is, if the mouse leaves
a window that has explicit mouse grab, a leave event should be sent and other
windows should get enter/leave events as well as the mouse traverses them.
For automatic mouse grab, however, a leave event should be sent when the
button is released.
\li Enter/Leave events: If there is a window explicitly grabbing mouse events
(\c{setMouseGrabEnabled()}), enter and leave events should only be sent to the
grabbing window when mouse cursor passes over the grabbing window boundary.
Other windows will not receive enter or leave events while the grab is active.
While an automatic mouse grab caused by a mouse button press is active, no window
will receive enter or leave events. When the last mouse button is released, the
autograbbing window will receive leave event if mouse cursor is no longer within
the window boundary.
When any grab starts, the window under cursor will receive a leave event unless
it is the grabbing window.
When any grab ends, the window under cursor will receive an enter event unless it
was the grabbing window.
\li Window positioning: When calling \c{QWindow::setFramePos()}, the flag
\c{QWindowPrivate::positionPolicy} is set to \c{QWindowPrivate::WindowFrameInclusive}.
This means the position includes the window frame, whose size is at this point

59
src/plugins/platforms/windows/qwindowsmousehandler.cpp
View File

@ -130,7 +130,8 @@ QWindowsMouseHandler::QWindowsMouseHandler() :
m_windowUnderMouse(0),
m_trackedWindow(0),
m_touchDevice(0),
m_leftButtonDown(false)
m_leftButtonDown(false),
m_previousCaptureWindow(0)
{
}
@ -212,6 +213,7 @@ bool QWindowsMouseHandler::translateMouseEvent(QWindow *window, HWND hwnd,
if (QWindowsContext::verboseEvents)
qDebug() << "Automatic mouse capture for missing buttondown event" << window;
}
m_previousCaptureWindow = window;
return true;
} else if (m_leftButtonDown && !actualLeftDown) {
m_leftButtonDown = false;
@ -253,12 +255,13 @@ bool QWindowsMouseHandler::translateMouseEvent(QWindow *window, HWND hwnd,
}
}
const bool hasCapture = platformWindow->hasMouseCapture();
const bool currentNotCapturing = hasCapture && currentWindowUnderMouse != window;
#ifndef Q_OS_WINCE
// Enter new window: track to generate leave event.
// If there is an active capture, we must track the actual capture window instead of window
// under cursor or leaves will trigger constantly, so always track the window we got
// native mouse event for.
if (window != m_trackedWindow) {
// If there is an active capture, only track if the current window is capturing,
// so we don't get extra leave when cursor leaves the application.
if (window != m_trackedWindow && !currentNotCapturing) {
TRACKMOUSEEVENT tme;
tme.cbSize = sizeof(TRACKMOUSEEVENT);
tme.dwFlags = TME_LEAVE;
@ -270,26 +273,37 @@ bool QWindowsMouseHandler::translateMouseEvent(QWindow *window, HWND hwnd,
}
#endif // !Q_OS_WINCE
// Qt expects enter/leave events for windows even when some window is capturing mouse input,
// except for automatic capture when mouse button is pressed - in that case enter/leave
// should be sent only after the last button is released.
// We need to track m_windowUnderMouse separately from m_trackedWindow, as
// Windows mouse tracking will not trigger WM_MOUSELEAVE for leaving window when
// mouse capture is set.
if (!platformWindow->hasMouseCapture()
|| !platformWindow->testFlag(QWindowsWindow::AutoMouseCapture)) {
if (m_windowUnderMouse != currentWindowUnderMouse) {
if (m_windowUnderMouse) {
// No enter or leave events are sent as long as there is an autocapturing window.
if (!hasCapture || !platformWindow->testFlag(QWindowsWindow::AutoMouseCapture)) {
// Leave is needed if:
// 1) There is no capture and we move from a window to another window.
// Note: Leaving the application entirely is handled in WM_MOUSELEAVE case.
// 2) There is capture and we move out of the capturing window.
// 3) There is a new capture and we were over another window.
if ((m_windowUnderMouse && m_windowUnderMouse != currentWindowUnderMouse
&& (!hasCapture || window == m_windowUnderMouse))
|| (hasCapture && m_previousCaptureWindow != window && m_windowUnderMouse
&& m_windowUnderMouse != window)) {
if (QWindowsContext::verboseEvents)
qDebug() << "Synthetic leave for " << m_windowUnderMouse;
QWindowSystemInterface::handleLeaveEvent(m_windowUnderMouse);
// Clear tracking if we are no longer over application,
// since we have already sent the leave.
if (!currentWindowUnderMouse)
if (currentNotCapturing) {
// Clear tracking if capturing and current window is not the capturing window
// to avoid leave when mouse actually leaves the application.
m_trackedWindow = 0;
// We are not officially in any window, but we need to set some cursor to clear
// whatever cursor the left window had, so apply the cursor of the capture window.
QWindowsWindow::baseWindowOf(window)->applyCursor();
}
if (currentWindowUnderMouse) {
}
// Enter is needed if:
// 1) There is no capture and we move to a new window.
// 2) There is capture and we move into the capturing window.
// 3) The capture just ended and we are over non-capturing window.
if ((currentWindowUnderMouse && m_windowUnderMouse != currentWindowUnderMouse
&& (!hasCapture || currentWindowUnderMouse == window))
|| (m_previousCaptureWindow && window != m_previousCaptureWindow && currentWindowUnderMouse
&& currentWindowUnderMouse != m_previousCaptureWindow)) {
if (QWindowsContext::verboseEvents)
qDebug() << "Entering " << currentWindowUnderMouse;
QWindowsWindow::baseWindowOf(currentWindowUnderMouse)->applyCursor();
@ -297,12 +311,15 @@ bool QWindowsMouseHandler::translateMouseEvent(QWindow *window, HWND hwnd,
currentWindowUnderMouse->mapFromGlobal(globalPosition),
globalPosition);
}
}
// We need to track m_windowUnderMouse separately from m_trackedWindow, as
// Windows mouse tracking will not trigger WM_MOUSELEAVE for leaving window when
// mouse capture is set.
m_windowUnderMouse = currentWindowUnderMouse;
}
QWindowSystemInterface::handleMouseEvent(window, winEventPosition, globalPosition, buttons,
QWindowsKeyMapper::queryKeyboardModifiers());
m_previousCaptureWindow = hasCapture ? window : 0;
return true;
}

1
src/plugins/platforms/windows/qwindowsmousehandler.h
View File

@ -82,6 +82,7 @@ private:
QHash<DWORD, int> m_touchInputIDToTouchPointID;
QTouchDevice *m_touchDevice;
bool m_leftButtonDown;
QWindow *m_previousCaptureWindow;
};
Qt::MouseButtons QWindowsMouseHandler::keyStateToMouseButtons(int wParam)

7
src/widgets/kernel/qapplication_qpa.cpp
View File

@ -250,13 +250,6 @@ void QApplicationPrivate::openPopup(QWidget *popup)
QApplication::sendEvent(fw, &e);
}
}
// Dispatch leave for last mouse receiver to update undermouse states
if (qt_last_mouse_receiver && !QWidget::mouseGrabber()) {
QApplicationPrivate::dispatchEnterLeave(0, qt_last_mouse_receiver.data(),
QGuiApplicationPrivate::lastCursorPosition);
qt_last_mouse_receiver = 0;
}
}
void QApplicationPrivate::initializeMultitouch_sys()

95
tests/auto/widgets/kernel/qwidget/tst_qwidget.cpp
View File

@ -9665,6 +9665,11 @@ void tst_QWidget::underMouse()
QVERIFY(popupWindow);
QVERIFY(QApplication::activePopupWidget() == &popupWidget);
// Send an artificial leave event for window, as it won't get generated automatically
// due to cursor not actually being over the window.
QWindowSystemInterface::handleLeaveEvent(window);
QApplication::processEvents();
// If there is an active popup, undermouse should not be reported (QTBUG-27478),
// but opening a popup causes leave for widgets under mouse.
QVERIFY(!topLevelWidget.underMouse());
@ -9682,13 +9687,8 @@ void tst_QWidget::underMouse()
topLevelWidget.resetCounts();
childWidget2.resetCounts();
// Note about commented out compares below:
// Widgets are not receiving enter/leave events properly when there is a popup up,
// so all enter and leave counts are not correct yet.
// Fix this test when QTBUG-27800 is fixed (i.e. uncomment commented out compares).
// Moving around while popup active should not change undermouse either,
// but should send enter and leave events for widgets
// Moving around while popup active should not change undermouse or cause
// enter and leave events for widgets.
QTest::mouseMove(popupWindow, popupWindow->mapFromGlobal(window->mapToGlobal(child2PointB)));
QVERIFY(!topLevelWidget.underMouse());
QVERIFY(!childWidget1.underMouse());
@ -9696,14 +9696,12 @@ void tst_QWidget::underMouse()
QVERIFY(!popupWidget.underMouse());
QCOMPARE(popupWidget.enters, 0);
QCOMPARE(popupWidget.leaves, 0);
//QCOMPARE(topLevelWidget.enters, 1); // QTBUG-27800
QCOMPARE(topLevelWidget.enters, 0);
QCOMPARE(topLevelWidget.leaves, 0);
QCOMPARE(childWidget1.enters, 0);
QCOMPARE(childWidget1.leaves, 0);
//QCOMPARE(childWidget2.enters, 1); // QTBUG-27800
QCOMPARE(childWidget2.enters, 0);
QCOMPARE(childWidget2.leaves, 0);
topLevelWidget.resetCounts();
childWidget2.resetCounts();
QTest::mouseMove(popupWindow, popupWindow->mapFromGlobal(window->mapToGlobal(inWindowPoint)));
QVERIFY(!topLevelWidget.underMouse());
@ -9717,8 +9715,7 @@ void tst_QWidget::underMouse()
QCOMPARE(childWidget1.enters, 0);
QCOMPARE(childWidget1.leaves, 0);
QCOMPARE(childWidget2.enters, 0);
//QCOMPARE(childWidget2.leaves, 1); // QTBUG-27800
childWidget2.resetCounts();
QCOMPARE(childWidget2.leaves, 0);
QTest::mouseMove(popupWindow, popupWindow->mapFromGlobal(window->mapToGlobal(child1Point)));
QVERIFY(!topLevelWidget.underMouse());
@ -9729,68 +9726,19 @@ void tst_QWidget::underMouse()
QCOMPARE(popupWidget.leaves, 0);
QCOMPARE(topLevelWidget.enters, 0);
QCOMPARE(topLevelWidget.leaves, 0);
//QCOMPARE(childWidget1.enters, 1); // QTBUG-27800
QCOMPARE(childWidget1.leaves, 0);
QCOMPARE(childWidget2.enters, 0);
QCOMPARE(childWidget2.leaves, 0);
childWidget1.resetCounts();
// Mouse moves off-application, should cause leaves for currently entered widgets
QWindowSystemInterface::handleLeaveEvent(window);
QApplication::processEvents();
QVERIFY(!topLevelWidget.underMouse());
QVERIFY(!childWidget1.underMouse());
QVERIFY(!childWidget2.underMouse());
QVERIFY(!popupWidget.underMouse());
QCOMPARE(popupWidget.enters, 0);
QCOMPARE(popupWidget.leaves, 0);
QCOMPARE(topLevelWidget.enters, 0);
QCOMPARE(topLevelWidget.leaves, 1);
QCOMPARE(childWidget1.enters, 0);
//QCOMPARE(childWidget1.leaves, 1); // QTBUG-27800
QCOMPARE(childWidget2.enters, 0);
QCOMPARE(childWidget2.leaves, 0);
topLevelWidget.resetCounts();
childWidget1.resetCounts();
// Mouse enters back in, should cause enter to topLevelWidget
QWindowSystemInterface::handleEnterEvent(window, inWindowPoint, window->mapToGlobal(inWindowPoint));
QApplication::processEvents();
QVERIFY(!topLevelWidget.underMouse());
QVERIFY(!childWidget1.underMouse());
QVERIFY(!childWidget2.underMouse());
QVERIFY(!popupWidget.underMouse());
QCOMPARE(popupWidget.enters, 0);
QCOMPARE(popupWidget.leaves, 0);
QCOMPARE(topLevelWidget.enters, 1);
QCOMPARE(topLevelWidget.leaves, 0);
QCOMPARE(childWidget1.enters, 0);
QCOMPARE(childWidget1.leaves, 0);
QCOMPARE(childWidget2.enters, 0);
QCOMPARE(childWidget2.leaves, 0);
topLevelWidget.resetCounts();
// Mouse moves to child widget, should cause enter to child
QTest::mouseMove(popupWindow, popupWindow->mapFromGlobal(window->mapToGlobal(child2PointB)));
QVERIFY(!topLevelWidget.underMouse());
QVERIFY(!childWidget1.underMouse());
QVERIFY(!childWidget2.underMouse());
QVERIFY(!popupWidget.underMouse());
QCOMPARE(popupWidget.enters, 0);
QCOMPARE(popupWidget.leaves, 0);
QCOMPARE(topLevelWidget.enters, 0);
QCOMPARE(topLevelWidget.leaves, 0);
QCOMPARE(childWidget1.enters, 0);
QCOMPARE(childWidget1.leaves, 0);
//QCOMPARE(childWidget2.enters, 1); // QTBUG-27800
QCOMPARE(childWidget2.leaves, 0);
childWidget2.resetCounts();
// Note: Mouse moving off-application while there is an active popup cannot be simulated
// without actually moving the cursor so it is not tested.
// Mouse enters popup, should cause enter to popup and leave to current widgets under mouse
QWindowSystemInterface::handleLeaveEvent(window);
// Mouse enters popup, should cause enter to popup.
// Once again, need to create artificial enter event.
const QPoint popupCenter = popupWindow->geometry().center();
QWindowSystemInterface::handleEnterEvent(popupWindow, popupWindow->mapFromGlobal(popupCenter), popupCenter);
QApplication::processEvents();
QTest::mouseMove(popupWindow, popupCenter);
QVERIFY(!topLevelWidget.underMouse());
QVERIFY(!childWidget1.underMouse());
QVERIFY(!childWidget2.underMouse());
@ -9798,14 +9746,12 @@ void tst_QWidget::underMouse()
QCOMPARE(popupWidget.enters, 1);
QCOMPARE(popupWidget.leaves, 0);
QCOMPARE(topLevelWidget.enters, 0);
QCOMPARE(topLevelWidget.leaves, 1);
QCOMPARE(topLevelWidget.leaves, 0);
QCOMPARE(childWidget1.enters, 0);
QCOMPARE(childWidget1.leaves, 0);
QCOMPARE(childWidget2.enters, 0);
//QCOMPARE(childWidget2.leaves, 1); // QTBUG-27800
QCOMPARE(childWidget2.leaves, 0);
popupWidget.resetCounts();
topLevelWidget.resetCounts();
childWidget2.resetCounts();
// Mouse moves around inside popup, no changes
QTest::mouseMove(popupWindow, QPoint(5, 5));
@ -9822,9 +9768,10 @@ void tst_QWidget::underMouse()
QCOMPARE(childWidget2.enters, 0);
QCOMPARE(childWidget2.leaves, 0);
// Mouse leaves popup and enters topLevelWidget, should cause enter to topLevelWidget and leave for popup
// Mouse leaves popup and enters topLevelWidget, should cause leave for popup
// but no enter to topLevelWidget. Again, artificial leave event needed.
QWindowSystemInterface::handleLeaveEvent(popupWindow);
QWindowSystemInterface::handleEnterEvent(window, inWindowPoint, window->mapToGlobal(inWindowPoint));
QTest::mouseMove(popupWindow, popupWindow->mapFromGlobal(window->mapToGlobal(inWindowPoint)));
QApplication::processEvents();
QVERIFY(!topLevelWidget.underMouse());
QVERIFY(!childWidget1.underMouse());
@ -9832,7 +9779,7 @@ void tst_QWidget::underMouse()
QVERIFY(!popupWidget.underMouse());
QCOMPARE(popupWidget.enters, 0);
QCOMPARE(popupWidget.leaves, 1);
QCOMPARE(topLevelWidget.enters, 1);
QCOMPARE(topLevelWidget.enters, 0);
QCOMPARE(topLevelWidget.leaves, 0);
QCOMPARE(childWidget1.enters, 0);
QCOMPARE(childWidget1.leaves, 0);