[wayland] Create event dispatcher in QPA plugin

We no longer need to have the event dispatcher created before starting
the QApplication, thus we can leave it to the QPA plugin to creat it.

Also we don't need to implement our own dispatcher any more but can
use one from Qt5PlatformSupport as we link it anyways. The special
need for dispatching the WaylandServer is no longer needed as we can
explicitly dispatch it from the QPA plugin if needed.

CMakeLists.txt

@@ -555,8 +555,6 @@ install(TARGETS kwin             ${INSTALL_TARGETS_DEFAULT_ARGS} LIBRARY NAMELIN
 install(TARGETS kdeinit_kwin_x11 ${INSTALL_TARGETS_DEFAULT_ARGS} )
 install(TARGETS kwin_x11         ${INSTALL_TARGETS_DEFAULT_ARGS} )
 
-include_directories(${Qt5Core_PRIVATE_INCLUDE_DIRS})
-include_directories(${Qt5Gui_PRIVATE_INCLUDE_DIRS})
 add_executable(kwin_wayland main_wayland.cpp)
 target_link_libraries(kwin_wayland kwin)
 

main_wayland.cpp

@@ -34,11 +34,11 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #include <KPluginMetaData>
 // Qt
 #include <qplatformdefs.h>
+#include <QAbstractEventDispatcher>
 #include <QCommandLineParser>
 #include <QtConcurrentRun>
 #include <QFile>
 #include <QFutureWatcher>
-#include <qpa/qwindowsysteminterface.h>
 #include <QProcess>
 #include <QSocketNotifier>
 #include <QThread>
@@ -316,25 +316,6 @@ static void readDisplay(int pipe)
     close(pipe);
 }
 
-EventDispatcher::EventDispatcher(QObject *parent)
-    : QEventDispatcherUNIX(parent)
-{
-}
-
-EventDispatcher::~EventDispatcher() = default;
-
-bool EventDispatcher::processEvents(QEventLoop::ProcessEventsFlags flags)
-{
-    waylandServer()->dispatch();
-    const bool didSendEvents = QEventDispatcherUNIX::processEvents(flags);
-    return QWindowSystemInterface::sendWindowSystemEvents(flags) || didSendEvents;
-}
-
-bool EventDispatcher::hasPendingEvents()
-{
-    return QEventDispatcherUNIX::hasPendingEvents() || QWindowSystemInterface::windowSystemEventsQueued();
-}
-
 static const QString s_waylandPlugin = QStringLiteral("KWinWaylandWaylandBackend");
 static const QString s_x11Plugin = QStringLiteral("KWinWaylandX11Backend");
 static const QString s_fbdevPlugin = QStringLiteral("KWinWaylandFbdevBackend");
@@ -368,10 +349,6 @@ static QString automaticBackendSelection()
 
 int main(int argc, char * argv[])
 {
-    // set our own event dispatcher to be able to dispatch events before the event loop is started
-    QAbstractEventDispatcher *eventDispatcher = new KWin::EventDispatcher();
-    QCoreApplication::setEventDispatcher(eventDispatcher);
-
     KWin::Application::setupMalloc();
     KWin::Application::setupLocalizedString();
 

main_wayland.h

@@ -20,7 +20,6 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #ifndef KWIN_MAIN_WAYLAND_H
 #define KWIN_MAIN_WAYLAND_H
 #include "main.h"
-#include <QtCore/private/qeventdispatcher_unix_p.h>
 #include <QProcessEnvironment>
 
 class QProcess;
@@ -70,17 +69,6 @@ private:
     QProcessEnvironment m_environment;
 };
 
-class EventDispatcher : public QEventDispatcherUNIX
-{
-    Q_OBJECT
-public:
-    explicit EventDispatcher(QObject *parent = nullptr);
-    virtual ~EventDispatcher();
-
-    bool processEvents(QEventLoop::ProcessEventsFlags flags) override;
-    bool hasPendingEvents() override;
-};
-
 }
 
 #endif

plugins/qpa/integration.cpp

@@ -43,6 +43,7 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #include <QtCore/private/qeventdispatcher_unix_p.h>
 #include <QtPlatformSupport/private/qgenericunixfontdatabase_p.h>
 #include <QtPlatformSupport/private/qgenericunixthemes_p.h>
+#include <QtPlatformSupport/private/qunixeventdispatcher_qpa_p.h>
 
 namespace KWin
 {
@@ -90,8 +91,7 @@ void Integration::initialize()
 
 QAbstractEventDispatcher *Integration::createEventDispatcher() const
 {
-    // TODO: add our own event dispatcher
-    return new QEventDispatcherUNIX;
+    return new QUnixEventDispatcherQPA;
 }
 
 QPlatformBackingStore *Integration::createPlatformBackingStore(QWindow *window) const