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This is a better solution for fbb485d4f6985643b27da3cc6c5b5f960c32e74d.
The existing solution was working fine, but it was exposing logic that is
internal to QWindowSystemInterface and platform plugin interaction. Some
platform plugins do event filtering at native event level - those that
support QAbstractEventDispatcher::filterNativeEvent(). Other plugins rely
on QWindowSystemInterface to do the filtering. Dispatchers should not care
about this.
The new logic rely on the fact that QWindowSystemInterfacePrivate::handleWindowSystemEvent
calls QAbstractEventDispatcher::wakeUp(). The same way postEventSourcePrepare()
rely on QCoreApplication::postEvent() to call QAbstractEventDispatcher::wakeUp().
Event sources run in the order they are attached, postEventSourcePrepare runs
before userEventSourcePrepare(). We rely on that order to pass wakeUpCalled
value.
Change-Id: I0327f4f2398fd863fb2421b8033bb1df8d65f5af
Reviewed-by: Allan Sandfeld Jensen <allan.jensen@qt.io>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
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This reverts commit 341bfcd1eaa9116c143e3b7d3219ef04c7b8a0cb.
As it turns out there might be use cases where we want to have proper
windowing system event integration with glib dispatcher via g_source_attach().
For example with gtk_dialog_run, where GTK blocks in a recursive main loop.
We want to continue dispatcing our windowing system events during this nested
event loop. Not having a proper glib integration can result in rendering issues,
e.g. when resizing parent window via mouse while GTK-based dialog is shown. Can
be seen on examples/widgets/richtext/textedit/ -> Format (from menu) -> "Color..."
The issue from 341bfcd1eaa actually should be fixed inside XCB platform plugin,
by improving integration with event dispatcher. That is handled in follow-up patches.
Change-Id: Icabc6d841a554aefbdd460765a3165d22e65f651
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Reviewed-by: Allan Sandfeld Jensen <allan.jensen@qt.io>
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... when QCoreApplication::processEvents() returns. This is the expected
behavior according to the documentation. Checked also the QUnixEventDispatcherQPA
dispatcher, which did work according to the documentation.
The sequence of events that causes the bad behavior:
1) XCB plugin sends a signals whenever there are new XCB events available
for processing. This signal is connected to QXcbConnection::processXcbEvents,
which will cause XCB events to be added to the QWindowSystemInterface (QWSI) event
queue.
2) When QCoreApplication::processEvents() is called, glib event dispatcher does
one iteration on all attached event sources. First it checks which sources are
ready, and after that starts dispatching events from each source that reported
to be ready.
3) In the case when there are no events in QWSI event queue, the source that handles
QWSI event dispatcing returns 'false'; If at the same iteration the source that
sends posted events (via QCoreApplication::sendPostedEvents()) has returned 'true'
and one of the posted events is to call QXcbConnection::processXcbEvents (due to
signal from step 1) then we get an assert in the following code:
QCoreApplication::processEvents();
Q_ASSERT(QWindowSystemInterface::windowSystemEventsQueued() == 0);
This happens because QXcbConnection::processXcbEvents has posted new events, but
they were not dispatched in this iteration. They would be dispatched in the next
iteration. Events being dispatched on subsequent iteration doesn't really matter
for Qt application, but is inconsistent from API point of view. If we were
populating QWSI queue from non-Gui thread, then it would be possible that
windowSystemEventsQueued() != 0, but that is not the case on XCB (don't know
about other platforms).
The issue could be fixed by always returning true from "check source" and then
simply dispatch 0 events at "dispatch" step if there isn't any in the queue. But
a better solution is to remove the event source all together. It is completely
unnecessary to have this indirection, when we can handle QWSI event dispatch
directly from Qt (like we do, for example, in QUnixEventDispatcherQPA and
QWinRTEventDispatcher). Not having Glib event source for QWSI events would have
also avoided issues that were fixed by fbb485d4f6985643b27da3cc6c5b5f960c32e74d.
Note, after this re-factoring QWindowSystemInterface::nonUserInputEventsQueued is
now unused, but I left it in as the API by itself is all right.
Task-number: QTBUG-62297
Change-Id: Ia245b835676bd87e63bf02b67036b42a3b1593cc
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
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.. when running event loop with QEventLoop::ExcludeUserInputEvents.
In a properly functioning code, g_main_context_iteration is expected
to block until any event source becomes ready to dispatch an event
(or interrupt occurs). Qt provides several custom event sources to
the Glib event loop. The bug (busy loop) was caused by faulty event
source implementation when QEventLoop::ExcludeUserInputEvents is set.
As long as the window system's event queue was not empty, we signaled
to the event dispatcher that there is an event ready to be dispatched.
This results in the dispatcher calling the relevant dispatch function
(which does handle the ExcludeUserInputEvents flag correctly). As we
do not dispatch user events, the window system's event queue never
becomes empty and we enter a busy loop (CPU running at 100%) where we
signal that we have events to dispatch, but we actually do not dispatch
them and g_main_context_iteration never gets to block.
This busy loop can cause blocking GTK functions such as gtk_dialog_run()
never return.
Task-number: QTBUG-59760
Task-number: QTBUG-57101
Change-Id: I545b7951108eeaba019614ae8f5a1168c8b26c27
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Reviewed-by: Lars Knoll <lars.knoll@qt.io>
Reviewed-by: Gunnar Sletta <gunnar@crimson.no>
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From Qt 5.7 -> LGPL v2.1 isn't an option anymore, see
http://blog.qt.io/blog/2016/01/13/new-agreement-with-the-kde-free-qt-foundation/
Updated license headers to use new LGPL header instead of LGPL21 one
(in those files which will be under LGPL v3)
Change-Id: I046ec3e47b1876cd7b4b0353a576b352e3a946d9
Reviewed-by: Lars Knoll <lars.knoll@theqtcompany.com>
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Qt copyrights are now in The Qt Company, so we could update the source
code headers accordingly. In the same go we should also fix the links to
point to qt.io.
Outdated header.LGPL removed (use header.LGPL21 instead)
Old header.LGPL3 renamed to header.LGPL3-COMM to match actual licensing
combination. New header.LGPL-COMM taken in the use file which were
using old header.LGPL3 (src/plugins/platforms/android/extract.cpp)
Added new header.LGPL3 containing Commercial + LGPLv3 + GPLv2 license
combination
Change-Id: I6f49b819a8a20cc4f88b794a8f6726d975e8ffbe
Reviewed-by: Matti Paaso <matti.paaso@theqtcompany.com>
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- Renamed LICENSE.LGPL to LICENSE.LGPLv21
- Added LICENSE.LGPLv3
- Removed LICENSE.GPL
Change-Id: Iec3406e3eb3f133be549092015cefe33d259a3f2
Reviewed-by: Iikka Eklund <iikka.eklund@digia.com>
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Change-Id: Ic804938fc352291d011800d21e549c10acac66fb
Reviewed-by: Lars Knoll <lars.knoll@digia.com>
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Change-Id: I6bc47f12e60bfbda60e3f242d3b680d5684903ea
Reviewed-by: Oliver Wolff <oliver.wolff@digia.com>
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Change-Id: I0abaf73d4b6b96dbcf499ea86749ced76348c281
Reviewed-by: Oliver Wolff <oliver.wolff@digia.com>
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@digia.com>
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Instead of assuming that all events should be handled when
a user event occurs, userEventSourceDispatch has to use the
flags used in QPAEventDispatcherGlib::processEvents.
Task-number: QTBUG-27595
Change-Id: Ib13607f89f7d3207ec83ab26f7d59b3c59a28c4e
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@digia.com>
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Change copyrights and license headers from Nokia to Digia
Change-Id: If1cc974286d29fd01ec6c19dd4719a67f4c3f00e
Reviewed-by: Lars Knoll <lars.knoll@digia.com>
Reviewed-by: Sergio Ahumada <sergio.ahumada@digia.com>
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No need to pass the dispatcher. Get rid of Windows logic to maintain
a stack of dispatcher associated with flags.
Change-Id: Ic2daad4b6762a46fac3274937effc188af436c9a
Reviewed-by: David Faure <faure@kde.org>
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As in the past, to avoid rewriting various autotests that contain
line-number information, an extra blank line has been inserted at the
end of the license text to ensure that this commit does not change the
total number of lines in the license header.
Change-Id: I311e001373776812699d6efc045b5f742890c689
Reviewed-by: Rohan McGovern <rohan.mcgovern@nokia.com>
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Replace Nokia contact email address with Qt Project website.
Change-Id: I431bbbf76d7c27d8b502f87947675c116994c415
Reviewed-by: Rohan McGovern <rohan.mcgovern@nokia.com>
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Change-Id: I02f2c620296fcd91d4967d58767ea33fc4e1e7dc
Reviewed-by: Rohan McGovern <rohan.mcgovern@nokia.com>
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This removes the last use of QWindowSystemInterfacePrivate
from outside QtGui, so we can make that class non-exported
again.
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Add QWindowSystemInterface::sendWindowSystemEvents,
which contains the canonical "empty and send queued
window system events" implementation.
Make the Cocoa, QPA, and GLIB dispatchers use the
new implementation. Cocoa now no longer inherits
from QPA.
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Platform plugin creation is now moved forward in
order to have a platform plugin instance at event
dispatcher creation time.
Plugins are now responsible for implementing
PlatformIntegration::createEventDispatcher and returning
an QAbstractEventDispatcher subclass.
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