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QEventDispatcherWin32: get rid of the hook procedure

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Instead of intercepting the WM_QT_SENDPOSTEDEVENTS message in the hook
procedure, we can handle it at receive points, making
qt_GetMessageHook() unnecessary.

Including general performance improvements, this patch fixes the issue
where some applications (e.g. Ableton Live) do not call a chain of
nested hooks for plugins.

Fixes: QTBUG-90949
Change-Id: If8e96848392c6f10d45af2aac0567707d16af673
Reviewed-by: Oliver Wolff <oliver.wolff@qt.io>
Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>
Reviewed-by: Volker Hilsheimer <volker.hilsheimer@qt.io>
Reviewed-by: Nuno Santos <nunosantos@imaginando.net>
(cherry picked from commit b7e08599cc784777d06d34e49e90c2d408ab629d)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>
This commit is contained in:
Alex Trotsenko 2021-02-23 15:00:48 +02:00 committed by Qt Cherry-pick Bot
parent 1c02584282
commit 26e34fcb52
2 changed files with 9 additions and 30 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

36
src/corelib/kernel/qeventdispatcher_win.cpp
View File

@ -96,7 +96,7 @@ LRESULT QT_WIN_CALLBACK qt_internal_proc(HWND hwnd, UINT message, WPARAM wp, LPA
QEventDispatcherWin32Private::QEventDispatcherWin32Private()
: interrupt(false), internalHwnd(0),
getMessageHook(0), sendPostedEventsTimerId(0), wakeUps(0),
sendPostedEventsTimerId(0), wakeUps(0),
activateNotifiersPosted(false)
{
}
@ -251,30 +251,21 @@ LRESULT QT_WIN_CALLBACK qt_internal_proc(HWND hwnd, UINT message, WPARAM wp, LPA
static const UINT mask = inputQueueMask();
if (HIWORD(GetQueueStatus(mask)) == 0)
q->sendPostedEvents();
else
d->startPostedEventsTimer();
return 0;
} // switch (message)
return DefWindowProc(hwnd, message, wp, lp);
}
LRESULT QT_WIN_CALLBACK qt_GetMessageHook(int code, WPARAM wp, LPARAM lp)
void QEventDispatcherWin32Private::startPostedEventsTimer()
{
QEventDispatcherWin32 *q = qobject_cast<QEventDispatcherWin32 *>(QAbstractEventDispatcher::instance());
Q_ASSERT(q != nullptr);
QEventDispatcherWin32Private *d = q->d_func();
MSG *msg = reinterpret_cast<MSG *>(lp);
// Windows unexpectedly passes PM_NOYIELD flag to the hook procedure,
// if ::PeekMessage(..., PM_REMOVE | PM_NOYIELD) is called from the event loop.
// So, retrieve 'removed' tag as a bit field.
const bool messageRemoved = (wp & PM_REMOVE) != 0;
if (msg->hwnd == d->internalHwnd && msg->message == WM_QT_SENDPOSTEDEVENTS
&& messageRemoved && d->sendPostedEventsTimerId == 0) {
if (sendPostedEventsTimerId == 0) {
// Start a timer to deliver posted events when the message queue is emptied.
d->sendPostedEventsTimerId = SetTimer(d->internalHwnd, SendPostedEventsTimerId,
USER_TIMER_MINIMUM, NULL);
sendPostedEventsTimerId = SetTimer(internalHwnd, SendPostedEventsTimerId,
USER_TIMER_MINIMUM, NULL);
}
return d->getMessageHook ? CallNextHookEx(0, code, wp, lp) : 0;
}
// Provide class name and atom for the message window used by
@ -458,14 +449,6 @@ QEventDispatcherWin32::QEventDispatcherWin32(QEventDispatcherWin32Private &dd, Q
Q_D(QEventDispatcherWin32);
d->internalHwnd = qt_create_internal_window(this);
// setup GetMessage hook needed to drive our posted events
d->getMessageHook = SetWindowsHookEx(WH_GETMESSAGE, (HOOKPROC) qt_GetMessageHook, NULL, GetCurrentThreadId());
if (Q_UNLIKELY(!d->getMessageHook)) {
int errorCode = GetLastError();
qFatal("Qt: INTERNAL ERROR: failed to install GetMessage hook: %d, %ls",
errorCode, qUtf16Printable(qt_error_string(errorCode)));
}
}
QEventDispatcherWin32::~QEventDispatcherWin32()
@ -536,6 +519,7 @@ bool QEventDispatcherWin32::processEvents(QEventLoop::ProcessEventsFlags flags)
}
if (d->internalHwnd == msg.hwnd && msg.message == WM_QT_SENDPOSTEDEVENTS) {
d->startPostedEventsTimer();
// Set result to 'true' because the message was sent by wakeUp().
retVal = true;
continue;
@ -865,10 +849,6 @@ void QEventDispatcherWin32::closingDown()
d->closingDown = true;
if (d->getMessageHook)
UnhookWindowsHookEx(d->getMessageHook);
d->getMessageHook = 0;
if (d->sendPostedEventsTimerId != 0)
KillTimer(d->internalHwnd, d->sendPostedEventsTimerId);
d->sendPostedEventsTimerId = 0;

3
src/corelib/kernel/qeventdispatcher_win_p.h
View File

@ -104,7 +104,6 @@ protected:
private:
friend LRESULT QT_WIN_CALLBACK qt_internal_proc(HWND hwnd, UINT message, WPARAM wp, LPARAM lp);
friend LRESULT QT_WIN_CALLBACK qt_GetMessageHook(int, WPARAM, LPARAM);
};
struct QSockNot {
@ -154,11 +153,11 @@ public:
// internal window handle used for socketnotifiers/timers/etc
HWND internalHwnd;
HHOOK getMessageHook;
// for controlling when to send posted events
UINT_PTR sendPostedEventsTimerId;
QAtomicInt wakeUps;
void startPostedEventsTimer();
// timers
WinTimerDict timerDict;