Implemented enter / leave events for QWidget.

src/gui/guikernel/qguiapplication.cpp

@@ -664,22 +664,18 @@ void QGuiApplicationPrivate::processKeyEvent(QWindowSystemInterfacePrivate::KeyE
     }
 }
 
-void QGuiApplicationPrivate::processEnterEvent(QWindowSystemInterfacePrivate::EnterEvent *)
+void QGuiApplicationPrivate::processEnterEvent(QWindowSystemInterfacePrivate::EnterEvent *e)
 {
 //    QGuiApplicationPrivate::dispatchEnterLeave(e->enter.data(),0);
 //    qt_last_mouse_receiver = e->enter.data();
+    QEvent event(QEvent::Enter);
+    QApplication::sendSpontaneousEvent(e->enter.data(), &event);
 }
 
-void QGuiApplicationPrivate::processLeaveEvent(QWindowSystemInterfacePrivate::LeaveEvent *)
+void QGuiApplicationPrivate::processLeaveEvent(QWindowSystemInterfacePrivate::LeaveEvent *e)
 {
-//    QGuiApplicationPrivate::dispatchEnterLeave(0,qt_last_mouse_receiver);
-
-#if 0
-    if (e->leave.data() && !e->leave.data()->isAncestorOf(qt_last_mouse_receiver)) //(???) this should not happen
-        QGuiApplicationPrivate::dispatchEnterLeave(0, e->leave.data());
-#endif
-    qt_last_mouse_receiver = 0;
-
+    QEvent event(QEvent::Leave);
+    QApplication::sendSpontaneousEvent(e->leave.data(), &event);
 }
 
 void QGuiApplicationPrivate::processActivatedEvent(QWindowSystemInterfacePrivate::ActivatedWindowEvent *)

src/gui/kernel/qwidgetwindow_qpa.cpp

@@ -42,6 +42,7 @@
 #include "qwidgetwindow_qpa_p.h"
 
 #include "private/qwidget_p.h"
+#include "private/qapplication_p.h"
 
 QT_BEGIN_NAMESPACE
 
@@ -57,6 +58,11 @@ bool QWidgetWindow::event(QEvent *event)
         handleCloseEvent(static_cast<QCloseEvent *>(event));
         return true;
 
+    case QEvent::Enter:
+    case QEvent::Leave:
+        handleEnterLeaveEvent(event);
+        return true;
+
     case QEvent::KeyPress:
     case QEvent::KeyRelease:
         handleKeyEvent(static_cast<QKeyEvent *>(event));
@@ -88,6 +94,20 @@ bool QWidgetWindow::event(QEvent *event)
     return m_widget->event(event) || QWindow::event(event);
 }
 
+QPointer<QWidget> qt_last_mouse_receiver = 0;
+
+void QWidgetWindow::handleEnterLeaveEvent(QEvent *event)
+{
+    if (event->type() == QEvent::Leave) {
+        QApplicationPrivate::dispatchEnterLeave(0, m_widget);
+        qt_last_mouse_receiver = 0;
+    } else {
+        QApplicationPrivate::dispatchEnterLeave(m_widget, 0);
+        qt_last_mouse_receiver = m_widget;
+        printf("Enter event: %p\n", m_widget);
+    }
+}
+
 void QWidgetWindow::handleMouseEvent(QMouseEvent *event)
 {
     // which child should have it?
@@ -106,6 +126,11 @@ void QWidgetWindow::handleMouseEvent(QMouseEvent *event)
 
     QPoint mapped = widget->mapFrom(m_widget, event->pos());
 
+    if (widget != qt_last_mouse_receiver) {
+        QApplicationPrivate::dispatchEnterLeave(widget, qt_last_mouse_receiver);
+        qt_last_mouse_receiver = widget;
+    }
+
     QMouseEvent translated(event->type(), mapped, event->globalPos(), event->button(), event->buttons(), event->modifiers());
     QGuiApplication::sendSpontaneousEvent(widget, &translated);
 

src/gui/kernel/qwidgetwindow_qpa_p.h

@@ -64,6 +64,7 @@ protected:
     bool event(QEvent *);
 
     void handleCloseEvent(QCloseEvent *);
+    void handleEnterLeaveEvent(QEvent *);
     void handleKeyEvent(QKeyEvent *);
     void handleMouseEvent(QMouseEvent *);
     void handleMoveEvent(QMoveEvent *);