touchui: First pass at XInput2 message pump.

views/event_x.cc

 // Copyright (c) 2010 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "views/event.h"
 
 #include <gdk/gdkx.h>
+#if defined(HAVE_XINPUT2)
+#include <X11/extensions/XInput2.h>
+#endif
 
 #include "app/keyboard_code_conversion_x.h"
 #include "views/widget/root_view.h"
 #include "views/widget/widget_gtk.h"
 
 namespace views {
 
 namespace {
 
 int GetEventFlagsFromXState(unsigned int state) {
   int flags = 0;
   if (state & ControlMask)
     flags |= Event::EF_CONTROL_DOWN;
   if (state & ShiftMask)
     flags |= Event::EF_SHIFT_DOWN;
   if (state & Mod1Mask)
     flags |= Event::EF_ALT_DOWN;
   if (state & Button1Mask)
     flags |= Event::EF_LEFT_BUTTON_DOWN;
   if (state & Button2Mask)
     flags |= Event::EF_MIDDLE_BUTTON_DOWN;
   if (state & Button3Mask)
     flags |= Event::EF_RIGHT_BUTTON_DOWN;
 
   return flags;
 }
 
-// Get the event flag for the button in XButtonEvent. During a KeyPress event,
-// |state| in XButtonEvent does not include the button that has just been
+// Get the event flag for the button in XButtonEvent. During a ButtonPress
+// event, |state| in XButtonEvent does not include the button that has just been
 // pressed. Instead |state| contains flags for the buttons (if any) that had
 // already been pressed before the current button, and |button| stores the most
 // current pressed button. So, if you press down left mouse button, and while
 // pressing it down, press down the right mouse button, then for the latter
 // event, |state| would have Button1Mask set but not Button3Mask, and |button|
 // would be 3.
 int GetEventFlagsForButton(int button) {
   switch (button) {
     case 1:
       return Event::EF_LEFT_BUTTON_DOWN;
     case 2:
       return Event::EF_MIDDLE_BUTTON_DOWN;
     case 3:
       return Event::EF_RIGHT_BUTTON_DOWN;
   }
 
   DLOG(WARNING) << "Unexpected button (" << button << ") received.";
   return 0;
 }
 
+#if defined(HAVE_XINPUT2)
+int GetButtonMaskForX2Event(XIDeviceEvent* xievent) {
+  int buttonflags = 0;
+
+  for (int i = 0; i < 8 * xievent->buttons.mask_len; i++) {
+    if (XIMaskIsSet(xievent->buttons.mask, i)) {
+      buttonflags |= GetEventFlagsForButton(i);
+    }
+  }
+
+  return buttonflags;
+}
+#endif  // HAVE_XINPUT2
+
 Event::EventType GetMouseEventType(XEvent* xev) {
   switch (xev->type) {
     case ButtonPress:
       return Event::ET_MOUSE_PRESSED;
     case ButtonRelease:
       return Event::ET_MOUSE_RELEASED;
     case MotionNotify:
       if (xev->xmotion.state & (Button1Mask | Button2Mask | Button3Mask)) {
         return Event::ET_MOUSE_DRAGGED;
       }
       return Event::ET_MOUSE_MOVED;
+#if defined(HAVE_XINPUT2)
+    case GenericEvent: {
+      XIDeviceEvent* xievent =
+          static_cast<XIDeviceEvent*>(xev->xcookie.data);
+      switch (xievent->evtype) {
+        case XI_ButtonPress:
+          return Event::ET_MOUSE_PRESSED;
+        case XI_ButtonRelease:
+          return Event::ET_MOUSE_RELEASED;
+        case XI_Motion:
+          return GetButtonMaskForX2Event(xievent) ? Event::ET_MOUSE_DRAGGED :
+              Event::ET_MOUSE_MOVED;
+      }
+    }
+#endif
   }
 
   return Event::ET_UNKNOWN;
 }
 
 gfx::Point GetMouseEventLocation(XEvent* xev) {
   switch (xev->type) {
     case ButtonPress:
     case ButtonRelease:
       return gfx::Point(xev->xbutton.x, xev->xbutton.y);
 
     case MotionNotify:
       return gfx::Point(xev->xmotion.x, xev->xmotion.y);
+
+#if defined(HAVE_XINPUT2)
+    case GenericEvent: {
+      XIDeviceEvent* xievent =
+          static_cast<XIDeviceEvent*>(xev->xcookie.data);
+      return gfx::Point(static_cast<int>(xievent->event_x),
+                        static_cast<int>(xievent->event_y));
+    }
+#endif
   }
 
   return gfx::Point();
 }
 
 int GetMouseEventFlags(XEvent* xev) {
   switch (xev->type) {
     case ButtonPress:
     case ButtonRelease:
       return GetEventFlagsFromXState(xev->xbutton.state) |
              GetEventFlagsForButton(xev->xbutton.button);
 
     case MotionNotify:
       return GetEventFlagsFromXState(xev->xmotion.state);
+
+#if defined(HAVE_XINPUT2)
+    case GenericEvent: {
+      XIDeviceEvent* xievent = static_cast<XIDeviceEvent*>(xev->xcookie.data);
+      switch (xievent->evtype) {
+        case XI_ButtonPress:
+        case XI_ButtonRelease:
+          return GetButtonMaskForX2Event(xievent) |
+                 GetEventFlagsFromXState(xievent->mods.effective) |
+                 GetEventFlagsForButton(xievent->detail);
+
+        case XI_Motion:
+           return GetButtonMaskForX2Event(xievent) |
+                  GetEventFlagsFromXState(xievent->mods.effective);
+      }
+    }
+#endif
   }
 
   return 0;
 }
 
 }  // namespace
 
 KeyEvent::KeyEvent(XEvent* xev)
     : Event(xev->type == KeyPress ?
             Event::ET_KEY_PRESSED : Event::ET_KEY_RELEASED,
             GetEventFlagsFromXState(xev->xkey.state)),
       key_code_(app::KeyboardCodeFromXKeyEvent(xev)),
       repeat_count_(0),
       message_flags_(0) {
 }
 
 MouseEvent::MouseEvent(XEvent* xev)
     : LocatedEvent(GetMouseEventType(xev),
                    GetMouseEventLocation(xev),
                    GetMouseEventFlags(xev)) {
 }
 
 }  // namespace views