Details
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Bug
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Resolution: Done
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Not Evaluated
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5.7
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None
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Arch Linux 64-bit with touchscreen
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157ee01a8d0be9a4dbac03883c9eaf3609fc1172
Description
When I press on the touchscreen, since I'm using a modern XI2, I don't expect to get synthesized mouse press from the X server - and I don't get it, directly. Nevertheless, the mouse cursor moves, and there seems to be a synthesized left mouse button state in the move event. QGuiApplicationPrivate::processMouseEvent() doesn't check whether the mouse event is a press, a release or a move; if the button state is different than the state it knew about, it creates a QPA mouseButtonEvent and calls processMouseEvent. The result is that Qt Quick sees a touch event and then a real, actual, non-synthesized mouse button press! That's problematic. If there was only XI_Motion but not XI_ButtonPress, maybe we shouldn't report a press. Or at least it should have MouseEventSynthesizedBySystem or MouseEventSynthesizedByQt so that QtQuick can ignore it.
1 QWindowSystemInterface::handleMouseEvent qwindowsysteminterface.cpp 181 0x7ffff6791c70 2 QXcbWindow::handleMouseEvent qxcbwindow.cpp 2510 0x7ffff7ea8db8 3 QXcbWindow::handleMotionNotifyEvent qxcbwindow.cpp 2389 0x7ffff7ea823f 4 QXcbWindow::handleXIMouseEvent qxcbwindow.cpp 2463 0x7ffff7ea896e 5 QXcbConnection::xi2HandleEvent qxcbconnection_xi2.cpp 559 0x7ffff7ebdf9b 6 QXcbConnection::handleXcbEvent qxcbconnection.cpp 1229 0x7ffff7e7ee9d 7 QXcbConnection::processXcbEvents qxcbconnection.cpp 1743 0x7ffff7e809be 8 QXcbConnection::qt_static_metacall moc_qxcbconnection.cpp 188 0x7ffff7eca8a2 9 QMetaCallEvent::placeMetaCall qobject.cpp 502 0x7ffff6334e8b 10 QObject::event qobject.cpp 1263 0x7ffff6335f0a 11 QXcbConnection::event qxcbconnection.cpp 2341 0x7ffff7e81dab 12 QCoreApplicationPrivate::notify_helper qcoreapplication.cpp 1122 0x7ffff62fbe0a 13 doNotify qcoreapplication.cpp 1063 0x7ffff62fba8d 14 QCoreApplication::notify qcoreapplication.cpp 1049 0x7ffff62fba00 15 QGuiApplication::notify qguiapplication.cpp 1663 0x7ffff67b01c2 16 QCoreApplication::notifyInternal2 qcoreapplication.cpp 988 0x7ffff62fb990 17 QCoreApplication::sendEvent qcoreapplication.h 231 0x7ffff62ff9fc 18 QCoreApplicationPrivate::sendPostedEvents qcoreapplication.cpp 1636 0x7ffff62fcdaf 19 QCoreApplication::sendPostedEvents qcoreapplication.cpp 1490 0x7ffff62fc72c 20 postEventSourceDispatch qeventdispatcher_glib.cpp 276 0x7ffff6378054 21 g_main_context_dispatch 0x7ffff3d45e67 22 ?? 0x7ffff3d460d0 23 g_main_context_iteration 0x7ffff3d4617c 24 QEventDispatcherGlib::processEvents qeventdispatcher_glib.cpp 423 0x7ffff637880b 25 QPAEventDispatcherGlib::processEvents qeventdispatcher_glib.cpp 121 0x7ffff7ecbb2e 26 QEventLoop::processEvents qeventloop.cpp 134 0x7ffff62f8372 27 QEventLoop::exec qeventloop.cpp 212 0x7ffff62f866e 28 QCoreApplication::exec qcoreapplication.cpp 1261 0x7ffff62fc0da 29 main main.cpp 598 0x4071fd
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1 QQuickWindowPrivate::deliverPressEvent qquickwindow.cpp 2282 0x7fffe95a4a49 2 QQuickWindowPrivate::deliverMouseEvent qquickwindow.cpp 1647 0x7fffe95a1058 3 QQuickWindowPrivate::deliverPointerEvent qquickwindow.cpp 2126 0x7fffe95a3b4d 4 QQuickWindowPrivate::handleMouseEvent qquickwindow.cpp 2019 0x7fffe95a351c 5 QQuickWindow::mousePressEvent qquickwindow.cpp 1985 0x7fffe95a319b 6 QWindow::event qwindow.cpp 2041 0x7ffff67c2d43 7 QQuickWindow::event qquickwindow.cpp 1566 0x7fffe95a0a90 8 QCoreApplicationPrivate::notify_helper qcoreapplication.cpp 1122 0x7ffff62fbe0a 9 doNotify qcoreapplication.cpp 1063 0x7ffff62fba8d 10 QCoreApplication::notify qcoreapplication.cpp 1049 0x7ffff62fba00 11 QGuiApplication::notify qguiapplication.cpp 1663 0x7ffff67b01c2 12 QCoreApplication::notifyInternal2 qcoreapplication.cpp 988 0x7ffff62fb990 13 QCoreApplication::sendSpontaneousEvent qcoreapplication.h 234 0x7ffff67b85e6 14 QGuiApplicationPrivate::processMouseEvent qguiapplication.cpp 1925 0x7ffff67b0fa0 15 QGuiApplicationPrivate::processMouseEvent qguiapplication.cpp 1828 0x7ffff67b0831 16 QGuiApplicationPrivate::processWindowSystemEvent qguiapplication.cpp 1708 0x7ffff67b0342 17 QWindowSystemInterface::sendWindowSystemEvents qwindowsysteminterface.cpp 698 0x7ffff6793b2c 18 userEventSourceDispatch qeventdispatcher_glib.cpp 76 0x7ffff7ecb91a 19 g_main_context_dispatch 0x7ffff3d45e67 20 ?? 0x7ffff3d460d0 ... <More>
Attachments
Issue Links
- is duplicated by
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- Closed
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| For Gerrit Dashboard: QTBUG-56156 | ||||||
|---|---|---|---|---|---|---|
| # | Subject | Branch | Project | Status | CR | V |
| 171919,3 | xcb: when using XI2 for mouse, change state only on press and release | 5.8 | qt/qtbase | Status: MERGED | +2 | 0 |
| 180710,5 | xcb: Ignore XI2 LMB mouse events from touch screens | 5.8 | qt/qtbase | Status: MERGED | +2 | 0 |