eglfs: Generate enter and leave events

In addition the logic in QGuiApplication that picks the target window for input
events with a null window has to be enhanced to be compatible with how real windowing
systems work: mouse events following a press are delivered to the same window until the
release, even if the cursor has left the original target window.

Task-number: QTBUG-44814
Change-Id: I3fea84ac77a5ccebeae5def64f92d8d2e03d13ff
Reviewed-by: Jørgen Lind <jorgen.lind@theqtcompany.com>

1 files changed, 14 insertions, 0 deletions

diff --git a/src/gui/kernel/qguiapplication.cpp b/src/gui/kernel/qguiapplication.cpp
index 60b289bacb..3d21b4affc 100644
--- a/src/gui/kernel/qguiapplication.cpp
+++ b/src/gui/kernel/qguiapplication.cpp
@@ -147,12 +147,15 @@ QString *QGuiApplicationPrivate::displayName = 0;
 QPalette *QGuiApplicationPrivate::app_pal = 0;        // default application palette
 
 Qt::MouseButtons QGuiApplicationPrivate::buttons = Qt::NoButton;
+
 ulong QGuiApplicationPrivate::mousePressTime = 0;
 Qt::MouseButton QGuiApplicationPrivate::mousePressButton = Qt::NoButton;
 int QGuiApplicationPrivate::mousePressX = 0;
 int QGuiApplicationPrivate::mousePressY = 0;
 int QGuiApplicationPrivate::mouse_double_click_distance = -1;
 
+QWindow *QGuiApplicationPrivate::currentMousePressWindow = 0;
+
 static Qt::LayoutDirection layout_direction = Qt::LeftToRight;
 static bool force_reverse = false;
 
@@ -1703,6 +1706,17 @@ void QGuiApplicationPrivate::processMouseEvent(QWindowSystemInterfacePrivate::Mo
     if (e->nullWindow()) {
         window = QGuiApplication::topLevelAt(globalPoint.toPoint());
         if (window) {
+            // Moves and the release following a press must go to the same
+            // window, even if the cursor has moved on over another window.
+            if (e->buttons != Qt::NoButton) {
+                if (!currentMousePressWindow)
+                    currentMousePressWindow = window;
+                else
+                    window = currentMousePressWindow;
+            } else if (currentMousePressWindow) {
+                window = currentMousePressWindow;
+                currentMousePressWindow = 0;
+            }
             QPointF delta = globalPoint - globalPoint.toPoint();
             localPoint = window->mapFromGlobal(globalPoint.toPoint()) + delta;
         }