touchui: First pass at XInput2 message pump.

views/focus/accelerator_handler_touch.cc

Index: views/focus/accelerator_handler_touch.cc
diff --git a/views/focus/accelerator_handler_touch.cc b/views/focus/accelerator_handler_touch.cc
index 9473600afccf8571988005866e694ae796665549..a07b977de3b9011aec23f09d2cc032868cd97476 100644
--- a/views/focus/accelerator_handler_touch.cc
+++ b/views/focus/accelerator_handler_touch.cc
@@ -5,7 +5,11 @@
 #include "views/focus/accelerator_handler.h"
 
 #include <gtk/gtk.h>
+#if defined(HAVE_XINPUT2)
+#include <X11/extensions/XInput2.h>
+#else
 #include <X11/Xlib.h>
+#endif
 
 #include "views/accelerator.h"
 #include "views/event.h"
@@ -34,11 +38,81 @@ RootView* FindRootViewForGdkWindow(GdkWindow* gdk_window) {
   return widget_gtk->GetRootView();
 }
 
+#if defined(HAVE_XINPUT2)
+bool X2EventIsTouchEvent(XEvent* xev) {
+  // TODO(sad): Determine if the captured event is a touch-event.
+  return false;
+}
+#endif  // HAVE_XINPUT2
+
 }  // namespace
 
+#if defined(HAVE_XINPUT2)
+bool DispatchX2Event(RootView* root, XEvent* xev) {
+  if (X2EventIsTouchEvent(xev)) {
+    // TODO(sad): Create a TouchEvent, and send it off to |root|. If the event
+    // is processed by |root|, then return. Otherwise let it fall through so it
+    // can be used (if desired) as a mouse event.
+
+    // TouchEvent touch(xev);
+    // if (root->OnTouchEvent(touch))
+    //  return true;
+  }
+
+  XGenericEventCookie* cookie = &xev->xcookie;
+
+  switch (cookie->evtype) {
+    case XI_KeyPress:
+    case XI_KeyRelease: {
+      // TODO(sad): We don't capture XInput2 events from keyboard yet.
+      break;
+    }
+    case XI_ButtonPress:
+    case XI_ButtonRelease: {
+      MouseEvent mouseev(xev);
+      if (cookie->evtype == XI_ButtonPress) {
+        return root->OnMousePressed(mouseev);
+      } else {
+        root->OnMouseReleased(mouseev, false);
+        return true;
+      }
+    }
+
+    case XI_Motion: {
+      MouseEvent mouseev(xev);
+      if (mouseev.GetType() == Event::ET_MOUSE_DRAGGED) {
+        return root->OnMouseDragged(mouseev);
+      } else {
+        root->OnMouseMoved(mouseev);
+        return true;
+      }
+      break;
+    }
+  }
+
+  return false;
+}
+
+#endif  // HAVE_XINPUT2
+
 bool DispatchXEvent(XEvent* xev) {
   GdkDisplay* gdisp = gdk_display_get_default();
-  GdkWindow* gwind = gdk_window_lookup_for_display(gdisp, xev->xany.window);
+  XID xwindow = xev->xany.window;
+
+#if defined(HAVE_XINPUT2)
+  if (xev->type == GenericEvent) {
+    if (XGetEventData(xev->xgeneric.display, &xev->xcookie)) {
+      XGenericEventCookie* cookie = &xev->xcookie;
+      XIDeviceEvent* xiev = static_cast<XIDeviceEvent*>(cookie->data);
+      xwindow = xiev->event;
+    } else {
+      DLOG(WARNING) << "Error fetching XGenericEventCookie for event.";
+      return false;
+    }
+  }
+#endif
+
+  GdkWindow* gwind = gdk_window_lookup_for_display(gdisp, xwindow);
 
   if (RootView* root = FindRootViewForGdkWindow(gwind)) {
     switch (xev->type) {
@@ -77,6 +151,14 @@ bool DispatchXEvent(XEvent* xev) {
           return true;
         }
       }
+
+#if defined(HAVE_XINPUT2)
+      case GenericEvent: {
+        bool ret = DispatchX2Event(root, xev);
+        XFreeEventData(xev->xgeneric.display, &xev->xcookie);
+        return ret;
+      }
+#endif
     }
   }