Change QWidget::enterEvent signature to take a QEnterEvent

This is a source incompatible change for widget implementors.
Leaving the old enterEvent as a virtual overload is problematic due to
shadowing. Best to make a clean cut, widget reimplementors will get a compile
time warning if they mark their override as such, or if they try to call the
parent class implementation.

Addresses ### Qt 6 comment.

[ChangeLog][QtWidgets][QWidget] The virtual enterEvent handler now receives
a QEnterEvent, which contains information about mouse position and button
states, rather than a plain QEvent.

Change-Id: I233f594fd79c0c090983b3db8532913d00132fde
Reviewed-by: Shawn Rutledge <shawn.rutledge@qt.io>
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@qt.io>
Reviewed-by: Lars Knoll <lars.knoll@qt.io>

1 files changed, 2 insertions, 1 deletions

diff --git a/src/widgets/kernel/qwidget.h b/src/widgets/kernel/qwidget.h
index 6f4c709c10..b423b0ebad 100644
--- a/src/widgets/kernel/qwidget.h
+++ b/src/widgets/kernel/qwidget.h
@@ -75,6 +75,7 @@ class QMouseEvent;
 class QWheelEvent;
 class QHoverEvent;
 class QKeyEvent;
+class QEnterEvent;
 class QFocusEvent;
 class QPaintEvent;
 class QMoveEvent;
@@ -622,7 +623,7 @@ protected:
     virtual void keyReleaseEvent(QKeyEvent *event);
     virtual void focusInEvent(QFocusEvent *event);
     virtual void focusOutEvent(QFocusEvent *event);
-    virtual void enterEvent(QEvent *event);
+    virtual void enterEvent(QEnterEvent *event);
     virtual void leaveEvent(QEvent *event);
     virtual void paintEvent(QPaintEvent *event);
     virtual void moveEvent(QMoveEvent *event);