touchui: Create touch-events.

Create and process touch-events. The touch-events are created from
pointer-events. The way to decide whether a 'pointer event' originated from a
touch-device is not yet well-defined. So for now, use the --touch-devices
command line parameter to specify which pointer devices should be treated as
touch-device. For example, you can run:

  ./out/Debug/chrome --touch-devices=7,8

to treat the events coming in from devices with id 7 and 8 as touch events.
(these are the slave ids you get from 'xinput list')

BUG=None
TEST=None

Review URL: http://codereview.chromium.org/4738001

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@67133 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 49 insertions, 0 deletions

diff --git a/views/event_x.cc b/views/event_x.cc
index 60b0d2f..774aa7f 100644
--- a/views/event_x.cc
+++ b/views/event_x.cc
@@ -71,6 +71,46 @@ int GetButtonMaskForX2Event(XIDeviceEvent* xievent) {
 
   return buttonflags;
 }
+
+Event::EventType GetTouchEventType(XEvent* xev) {
+  XGenericEventCookie* cookie = &xev->xcookie;
+  switch (cookie->evtype) {
+    case XI_ButtonPress:
+      return Event::ET_TOUCH_PRESSED;
+    case XI_ButtonRelease:
+      return Event::ET_TOUCH_RELEASED;
+    case XI_Motion:
+      return Event::ET_TOUCH_MOVED;
+
+    // Note: We will not generate a _STATIONARY event here. It will be created,
+    // when necessary, by a RWHVV.
+
+    // TODO(sad): When do we trigger a _CANCELLED event? Maybe that will also be
+    // done by a RWHVV, e.g. when it gets destroyed in the middle of a
+    // touch-sequence?
+  }
+
+  return Event::ET_UNKNOWN;
+}
+
+gfx::Point GetTouchEventLocation(XEvent* xev) {
+  XIDeviceEvent* xiev = static_cast<XIDeviceEvent*>(xev->xcookie.data);
+  return gfx::Point(xiev->event_x, xiev->event_y);
+}
+
+int GetTouchEventFlags(XEvent* xev) {
+  XIDeviceEvent* xiev = static_cast<XIDeviceEvent*>(xev->xcookie.data);
+  return GetButtonMaskForX2Event(xiev) |
+         GetEventFlagsFromXState(xiev->mods.effective);
+}
+
+int GetTouchIDFromXEvent(XEvent* xev) {
+  // TODO(sad): How we determine the touch-id from the event is as yet
+  // undecided.
+  XIDeviceEvent* xiev = static_cast<XIDeviceEvent*>(xev->xcookie.data);
+  return xiev->sourceid;
+}
+
 #endif  // HAVE_XINPUT2
 
 Event::EventType GetMouseEventType(XEvent* xev) {
@@ -182,4 +222,13 @@ MouseWheelEvent::MouseWheelEvent(XEvent* xev)
                                                       // used for GTK+.
 }
 
+#if defined(HAVE_XINPUT2)
+TouchEvent::TouchEvent(XEvent* xev)
+    : LocatedEvent(GetTouchEventType(xev),
+                   GetTouchEventLocation(xev),
+                   GetTouchEventFlags(xev)),
+      touch_id_(GetTouchIDFromXEvent(xev)) {
+}
+#endif
+
 }  // namespace views