Refactor pointer event hierarchy

Some goals that have hopefully been achieved are:
- make QPointerEvent and QEventPoint resemble their Qt Quick
  counterparts to such an extent that we can remove those wrappers
  and go back to delivering the original events in Qt Quick
- make QEventPoint much smaller than QTouchEvent::TouchPoint, with no pimpl
- remove most public setters
- reduce the usage of complex constructors that take many arguments
- don't repeat ourselves: move accessors and storage upwards
  rather than having redundant ones in subclasses
- standardize the set of accessors in QPointerEvent
- maintain source compatibility as much as possible: do not require
  modifying event-handling code in any QWidget subclass

To avoid public setters we now introduce a few QMutable* subclasses.
This is a bit like the Builder pattern except that it doesn't involve
constructing a separate disposable object: the main event type can be
cast to the mutable type at any time to enable modifications, iff the
code is linked with gui-private. Therefore event classes can have
less-"complete" constructors, because internal Qt code can use setters
the same way it could use the ones in QTouchEvent before; and the event
classes don't need many friends. Even some read-accessors can be kept
private unless we are sure we want to expose them.

Task-number: QTBUG-46266
Fixes: QTBUG-72173
Change-Id: I740e4e40165b7bc41223d38b200bbc2b403e07b6
Reviewed-by: Volker Hilsheimer <volker.hilsheimer@qt.io>

1 files changed, 2 insertions, 0 deletions

diff --git a/src/corelib/global/qnamespace.h b/src/corelib/global/qnamespace.h
index 3e2020ebd5..65a8e8b3c8 100644
--- a/src/corelib/global/qnamespace.h
+++ b/src/corelib/global/qnamespace.h
@@ -1618,6 +1618,7 @@ namespace Qt {
     };
 
     enum TouchPointState {
+        TouchPointUnknownState = 0x00,
         TouchPointPressed    = 0x01,
         TouchPointMoved      = 0x02,
         TouchPointStationary = 0x04,
@@ -1707,6 +1708,7 @@ namespace Qt {
     };
 
     enum MouseEventFlag {
+        NoMouseEventFlag = 0x00,
         MouseEventCreatedDoubleClick = 0x01,
         MouseEventFlagMask = 0xFF
     };