Move event-response code into dedicated event handlers

Address ### Qt 6 comments.

Change-Id: I4c90265293ddf539f860630901ab6d9487e2a1b5
Reviewed-by: Shawn Rutledge <shawn.rutledge@qt.io>

src/widgets/itemviews/qtreeview.cpp

@@ -1237,6 +1237,22 @@ void QTreeView::scrollTo(const QModelIndex &index, ScrollHint hint)
     }
 }
 
+/*!
+  \reimp
+*/
+void QTreeView::changeEvent(QEvent *event)
+{
+    Q_D(QTreeView);
+    if (event->type() == QEvent::StyleChange) {
+        if (!d->customIndent) {
+            // QAbstractItemView calls this method in case of a style change,
+            // so update the indentation here if it wasn't set manually.
+            d->updateIndentationFromStyle();
+        }
+    }
+    QAbstractItemView::changeEvent(event);
+}
+
 /*!
   \reimp
 */
@@ -2097,12 +2113,6 @@ QModelIndex QTreeView::indexBelow(const QModelIndex &index) const
 void QTreeView::doItemsLayout()
 {
     Q_D(QTreeView);
-    if (!d->customIndent) {
-        // ### Qt 6: move to event()
-        // QAbstractItemView calls this method in case of a style change,
-        // so update the indentation here if it wasn't set manually.
-        d->updateIndentationFromStyle();
-    }
     if (d->hasRemovedItems) {
         //clean the QSet that may contains old (and this invalid) indexes
         d->hasRemovedItems = false;

src/widgets/itemviews/qtreeview.h

@@ -185,6 +185,7 @@ protected:
     QRegion visualRegionForSelection(const QItemSelection &selection) const override;
     QModelIndexList selectedIndexes() const override;
 
+    void changeEvent(QEvent *event) override;
     void timerEvent(QTimerEvent *event) override;
     void paintEvent(QPaintEvent *event) override;
 

src/widgets/widgets/qlineedit.cpp

@@ -1436,23 +1436,29 @@ void QLineEdit::paste()
 
 #endif // !QT_NO_CLIPBOARD
 
+/*!
+    \reimp
+*/
+void QLineEdit::timerEvent(QTimerEvent *e)
+{
+    Q_D(QLineEdit);
+    int timerId = ((QTimerEvent*)e)->timerId();
+    if (false) {
+#if QT_CONFIG(draganddrop)
+    } else if (timerId == d->dndTimer.timerId()) {
+        d->drag();
+#endif
+    }
+    else if (timerId == d->tripleClickTimer.timerId())
+        d->tripleClickTimer.stop();
+}
+
 /*! \reimp
 */
 bool QLineEdit::event(QEvent * e)
 {
     Q_D(QLineEdit);
-    if (e->type() == QEvent::Timer) {
-        // ### Qt6: move to timerEvent, is here for binary compatibility
-        int timerId = ((QTimerEvent*)e)->timerId();
-        if (false) {
-#if QT_CONFIG(draganddrop)
-        } else if (timerId == d->dndTimer.timerId()) {
-            d->drag();
-#endif
-        }
-        else if (timerId == d->tripleClickTimer.timerId())
-            d->tripleClickTimer.stop();
-    } else if (e->type() == QEvent::ContextMenu) {
+    if (e->type() == QEvent::ContextMenu) {
 #ifndef QT_NO_IM
         if (d->control->composeMode())
             return true;
@@ -1465,8 +1471,6 @@ bool QLineEdit::event(QEvent * e)
         QKeyEvent *ke = static_cast<QKeyEvent*>(e);
         d->control->processShortcutOverrideEvent(ke);
 #endif
-    } else if (e->type() == QEvent::KeyRelease) {
-        d->control->updateCursorBlinking();
     } else if (e->type() == QEvent::Show) {
         //In order to get the cursor blinking if QComboBox::setEditable is called when the combobox has focus
         if (hasFocus()) {
@@ -1774,6 +1778,15 @@ void QLineEdit::keyPressEvent(QKeyEvent *event)
     }
 }
 
+/*!
+    \reimp
+*/
+void QLineEdit::keyReleaseEvent(QKeyEvent *)
+{
+    Q_D(QLineEdit);
+    d->control->updateCursorBlinking();
+}
+
 /*!
   \since 4.4
 

src/widgets/widgets/qlineedit.h

@@ -214,6 +214,7 @@ protected:
     void mouseReleaseEvent(QMouseEvent *) override;
     void mouseDoubleClickEvent(QMouseEvent *) override;
     void keyPressEvent(QKeyEvent *) override;
+    void keyReleaseEvent(QKeyEvent *) override;
     void focusInEvent(QFocusEvent *) override;
     void focusOutEvent(QFocusEvent *) override;
     void paintEvent(QPaintEvent *) override;
@@ -233,6 +234,7 @@ protected:
 public:
     QVariant inputMethodQuery(Qt::InputMethodQuery) const override;
     Q_INVOKABLE QVariant inputMethodQuery(Qt::InputMethodQuery property, QVariant argument) const;
+    void timerEvent(QTimerEvent *) override;
     bool event(QEvent *) override;
 protected:
     QRect cursorRect() const;