linux aura: Support touch events.

ui/views/widget/desktop_aura/desktop_root_window_host_x11.cc

 // Copyright (c) 2012 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 "ui/views/widget/desktop_aura/desktop_root_window_host_x11.h"
 
 #include <X11/extensions/shape.h>
 #include <X11/extensions/XInput2.h>
 #include <X11/Xatom.h>
 #include <X11/Xregion.h>
@@ skipping 1094 matching lines @@
     delegate_->OnHostMouseEvent(event);
   } else {
     // Another DesktopRootWindowHostX11 has installed itself as
     // capture. Translate the event's location and dispatch to the other.
     event->ConvertLocationToTarget(root_window_->window(),
                                    g_current_capture->root_window_->window());
     g_current_capture->delegate_->OnHostMouseEvent(event);
   }
 }
 
+void DesktopRootWindowHostX11::DispatchTouchEvent(ui::TouchEvent* event) {
+  if (g_current_capture && g_current_capture != this &&
+      event->type() == ui::ET_TOUCH_PRESSED) {
+    event->ConvertLocationToTarget(root_window_->window(),
+                                   g_current_capture->root_window_->window());
+    g_current_capture->delegate_->OnHostTouchEvent(event);
+  } else {
+    delegate_->OnHostTouchEvent(event);
+  }
+}
+
 void DesktopRootWindowHostX11::ResetWindowRegion() {
   if (!IsMaximized()) {
     gfx::Path window_mask;
     views::Widget* widget = native_widget_delegate_->AsWidget();
     if (widget->non_client_view()) {
       // Some frame views define a custom (non-rectangular) window mask. If
       // so, use it to define the window shape. If not, fall through.
       widget->non_client_view()->GetWindowMask(bounds_.size(), &window_mask);
       if (window_mask.countPoints() > 0) {
         Region region = gfx::CreateRegionFromSkPath(window_mask);
@@ skipping 145 matching lines @@
     case GenericEvent: {
       ui::TouchFactory* factory = ui::TouchFactory::GetInstance();
       if (!factory->ShouldProcessXI2Event(xev))
         break;
 
       ui::EventType type = ui::EventTypeFromNative(xev);
       XEvent last_event;
       int num_coalesced = 0;
 
       switch (type) {
-        // case ui::ET_TOUCH_MOVED:
-        //   num_coalesced = CoalescePendingMotionEvents(xev, &last_event);
-        //   if (num_coalesced > 0)
-        //     xev = &last_event;
-        //   // fallthrough
-        // case ui::ET_TOUCH_PRESSED:
-        // case ui::ET_TOUCH_RELEASED: {
-        //   ui::TouchEvent touchev(xev);
-        //   delegate_->OnHostTouchEvent(&touchev);
-        //   break;
-        // }
+        case ui::ET_TOUCH_MOVED:
+          num_coalesced = ui::CoalescePendingMotionEvents(xev, &last_event);
+          if (num_coalesced > 0)
+            xev = &last_event;
+          // fallthrough
+        case ui::ET_TOUCH_PRESSED:
+        case ui::ET_TOUCH_RELEASED: {
+          ui::TouchEvent touchev(xev);
+          DispatchTouchEvent(&touchev);
+          break;
+        }
         case ui::ET_MOUSE_MOVED:
         case ui::ET_MOUSE_DRAGGED:
         case ui::ET_MOUSE_PRESSED:
         case ui::ET_MOUSE_RELEASED:
         case ui::ET_MOUSE_ENTERED:
         case ui::ET_MOUSE_EXITED: {
           if (type == ui::ET_MOUSE_MOVED || type == ui::ET_MOUSE_DRAGGED) {
             // If this is a motion event, we want to coalesce all pending motion
             // events that are at the top of the queue.
             num_coalesced = ui::CoalescePendingMotionEvents(xev, &last_event);
@@ skipping 209 matching lines @@
   if (linux_ui) {
     ui::NativeTheme* native_theme = linux_ui->GetNativeTheme();
     if (native_theme)
       return native_theme;
   }
 
   return ui::NativeTheme::instance();
 }
 
 }  // namespace views