Replace the deprecated QWheelEvent::delta() -> QWheelEvent::angleDelta()

Replaced the usages of deprecated QWheelEvent::delta() with
QWheelEvent::angleDelta().y(), assuming that it's acceptable to use only the
vertical component of angle delta.

Task-number: QTBUG-76491
Change-Id: I4aa0a5a0e9ba7f33321bdb879b66ffb589b53e42
Reviewed-by: Eike Ziller <eike.ziller@qt.io>

src/libs/qmleditorwidgets/contextpanewidgetimage.cpp

@@ -941,7 +941,7 @@ void PreviewDialog::setPixmap(const QPixmap &p, int zoom)
 
 void PreviewDialog::wheelEvent(QWheelEvent* event)
 {
-    int delta = event->delta();
+    const auto delta = event->angleDelta().y();
     event->accept();
     if (delta >  0) {
         if (m_zoom == 1)

src/libs/utils/treeviewcombobox.cpp

@@ -83,9 +83,9 @@ QModelIndex TreeViewComboBox::lastIndex(const QModelIndex &index)
 void TreeViewComboBox::wheelEvent(QWheelEvent *e)
 {
     QModelIndex index = m_view->currentIndex();
-    if (e->delta() > 0)
+    if (e->angleDelta().y() > 0)
         index = indexAbove(index);
-    else if (e->delta() < 0)
+    else if (e->angleDelta().y() < 0)
         index = indexBelow(index);
 
     e->accept();

src/plugins/help/helpviewer.cpp

@@ -176,7 +176,7 @@ void HelpViewer::wheelEvent(QWheelEvent *event)
 {
     if (m_scrollWheelZoomingEnabled && event->modifiers() == Qt::ControlModifier) {
         event->accept();
-        event->delta() > 0 ? scaleUp() : scaleDown();
+        event->angleDelta().y() > 0 ? scaleUp() : scaleDown();
     } else {
         QWidget::wheelEvent(event);
     }

src/plugins/imageviewer/imageview.cpp

@@ -286,7 +286,7 @@ void ImageView::doScale(qreal factor)
 
 void ImageView::wheelEvent(QWheelEvent *event)
 {
-    qreal factor = qPow(Constants::DEFAULT_SCALE_FACTOR, event->delta() / 240.0);
+    qreal factor = qPow(Constants::DEFAULT_SCALE_FACTOR, event->angleDelta().y() / 240.0);
     doScale(factor);
     event->accept();
 }

src/plugins/qmldesigner/components/formeditor/formeditorwidget.cpp

@@ -209,7 +209,7 @@ void FormEditorWidget::resetNodeInstanceView()
 void FormEditorWidget::wheelEvent(QWheelEvent *event)
 {
     if (event->modifiers().testFlag(Qt::ControlModifier)) {
-        if (event->delta() > 0)
+        if (event->angleDelta().y() > 0)
             zoomAction()->zoomOut();
         else
             zoomAction()->zoomIn();

src/plugins/scxmleditor/common/graphicsview.cpp

@@ -138,7 +138,7 @@ void GraphicsView::zoomOut()
 void GraphicsView::wheelEvent(QWheelEvent *event)
 {
     if (Qt::ControlModifier & event->modifiers()) {
-        if (event->delta() > 0)
+        if (event->angleDelta().y() > 0)
             zoomIn();
         else
             zoomOut();

src/plugins/scxmleditor/common/magnifier.cpp

@@ -89,7 +89,7 @@ void Magnifier::wheelEvent(QWheelEvent *e)
 {
     QWidget::wheelEvent(e);
 
-    if (e->delta() > 0)
+    if (e->angleDelta().y() > 0)
         m_ui.m_graphicsView->scale(1.1, 1.1);
     else
         m_ui.m_graphicsView->scale(1.0 / 1.1, 1.0 / 1.1);

src/plugins/scxmleditor/common/navigatorgraphicsview.cpp

@@ -75,7 +75,7 @@ void NavigatorGraphicsView::paintEvent(QPaintEvent *e)
 void NavigatorGraphicsView::wheelEvent(QWheelEvent *event)
 {
     if (Qt::ControlModifier & event->modifiers()) {
-        if (event->delta() > 0)
+        if (event->angleDelta().y() > 0)
             emit zoomIn();
         else
             emit zoomOut();

src/plugins/texteditor/codeassist/functionhintproposalwidget.cpp

@@ -310,7 +310,7 @@ bool FunctionHintProposalWidget::eventFilter(QObject *obj, QEvent *e)
             if (d->m_popupFrame && !d->m_popupFrame->isAncestorOf(widget)) {
                 abort();
             } else if (e->type() == QEvent::Wheel) {
-                if (static_cast<QWheelEvent*>(e)->delta() > 0)
+                if (static_cast<QWheelEvent*>(e)->angleDelta().y() > 0)
                     previousPage();
                 else
                     nextPage();