Introduce a touch protocol extension.

Using this opt-in protocol extension all data from QTouchEvent will
properly be delivered to the clients.

By default compositors will still use the standard and limited
protocol for touch events to remain compatible with non-Qt
clients. However by calling enableTouchExtension() in the compositor,
touch events will be sent through the new protocol and thus Qt clients
will receive proper QTouchEvents. Non-Qt clients will get no touch
data in this mode.

The contents of the rawScreenPositions() list are not yet delivered as
the size implications remain to be checked.

Change-Id: I981b9c4d44ea808a95b770bf948320abd47fc036
Sanity-Review: Qt Sanity Bot <qt_sanity_bot@ovi.com>
Reviewed-by: Jørgen Lind <jorgen.lind@nokia.com>

2 files changed, 8 insertions, 0 deletions

diff --git a/examples/qwindow-compositor/main.cpp b/examples/qwindow-compositor/main.cpp
index 3a640140a..fdacaf56c 100644
--- a/examples/qwindow-compositor/main.cpp
+++ b/examples/qwindow-compositor/main.cpp
@@ -47,6 +47,10 @@
 
 int main(int argc, char *argv[])
 {
+    // Enable the following to have touch events generated from mouse events.
+    // Very handy for testing touch event delivery without a real touch device.
+    // QGuiApplication::setAttribute(Qt::AA_SynthesizeTouchForUnhandledMouseEvents, true);
+
     QGuiApplication app(argc, argv);
     QScreen *screen = QGuiApplication::primaryScreen();
     QRect screenGeometry = screen->availableGeometry();
diff --git a/examples/qwindow-compositor/qwindowcompositor.cpp b/examples/qwindow-compositor/qwindowcompositor.cpp
index 310ff19ab..1aa4f102e 100644
--- a/examples/qwindow-compositor/qwindowcompositor.cpp
+++ b/examples/qwindow-compositor/qwindowcompositor.cpp
@@ -14,6 +14,10 @@ QWindowCompositor::QWindowCompositor(QOpenGLWindow *window)
     , m_draggingWindow(0)
     , m_dragKeyIsPressed(false)
 {
+    // Enable the following to have all QTouchEvent-specific data delivered
+    // using a custom protocol extension.
+    // enableTouchExtension();
+
     enableSubSurfaceExtension();
     m_window->makeCurrent();