Support multiple touch targets in QGraphicsView

This required a larger change to the kernel and graphicsview directories to
make this as efficient as possible:

1. QTouchEvent::TouchPoint becomes the base for
QGraphicsSceneTouchEvent::TouchPoint - this means there is one private for
every touch point, and we can store both the screen and scene coordinates
in one place. Converting a QTouchEvent to QGraphicsSceneTouchEvent becomes
nothing more than casting the QTouchEvent::TouchPoints to
QGraphicsSceneTouchEvent::TouchPoints.

2. The logic that we use in QApplication to convert WM_TOUCH* messages to
QTouchEvents is essentially duplicated (with some minor changes) to
QGraphicsScene so that it can support mulitple touch item targets. I
will have to investigate how I can perhaps merge some of the duplicated
code.

QEvent::GraphicsSceneTouchBegin propagation is not implemented yet, and will
come in a later commit

1 files changed, 2 insertions, 2 deletions

diff --git a/src/gui/kernel/qevent_p.h b/src/gui/kernel/qevent_p.h
index 8623c66..dd78c3e 100644
--- a/src/gui/kernel/qevent_p.h
+++ b/src/gui/kernel/qevent_p.h
@@ -98,11 +98,11 @@ public:
           pressure(qreal(-1.))
     { }
 
-    QPointer<QWidget> widget;
     int id;
     Qt::TouchPointState state;
     QPointF pos, startPos, lastPos;
-    QPointF globalPos, startGlobalPos, lastGlobalPos;
+    QPointF scenePos, startScenePos, lastScenePos;
+    QPointF screenPos, startScreenPos, lastScreenPos;
     qreal pressure;
 };