Remove usages of deprecated APIs of QWheelEvent

- Replaced the usages of deprecated QWheelEvent::delta() and
  QWheelEvent::orientation() with QWheelEvent::angleDelta().
  In most of the examples it is acceptable to use only the vertical
  component of angle delta.

- Made the docs APIs to build conditionally, based on the
  deprecation version.

Task-number: QTBUG-76491
Task-number: QTBUG-76540
Change-Id: Id4230d483f724af49e4b6349b44881c3944de2a2
Reviewed-by: Volker Hilsheimer <volker.hilsheimer@qt.io>

1 files changed, 6 insertions, 5 deletions

diff --git a/examples/widgets/widgets/mousebuttons/buttontester.cpp b/examples/widgets/widgets/mousebuttons/buttontester.cpp
index 6653221698..88dbbeda45 100644
--- a/examples/widgets/widgets/mousebuttons/buttontester.cpp
+++ b/examples/widgets/widgets/mousebuttons/buttontester.cpp
@@ -93,15 +93,16 @@ void ButtonTester::mouseDoubleClickEvent(QMouseEvent *e)
 void ButtonTester::wheelEvent (QWheelEvent *e)
 {
     QString result;
-    if (e->delta() > 0) {
-
-        if (e->orientation() == Qt::Vertical) {
+    const bool vertical = qAbs(e->angleDelta().y()) >= qAbs(e->angleDelta().x());
+    const int delta = vertical ? e->angleDelta().y() : e->angleDelta().x();
+    if (delta > 0) {
+        if (vertical) {
             result = "Mouse Wheel Event: UP";
         } else {
             result = "Mouse Wheel Event: LEFT";
         }
-    } else if (e->delta() < 0) {
-        if (e->orientation() == Qt::Vertical) {
+    } else if (delta < 0) {
+        if (vertical) {
             result = "Mouse Wheel Event: DOWN";
         } else {
             result = "Mouse Wheel Event: RIGHT";