Add initial support for handling touch events in desktop chrome AURA.

ui/views/win/hwnd_message_handler.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/win/hwnd_message_handler.h"
 
 #include <dwmapi.h>
 #include <shellapi.h>
 
 #include "base/bind.h"
@@ skipping 277 matching lines @@
 
 #endif
 
 // A custom MSAA object id used to determine if a screen reader is actively
 // listening for MSAA events.
 const int kCustomObjectID = 1;
 
 // The thickness of an auto-hide taskbar in pixels.
 const int kAutoHideTaskbarThicknessPx = 2;
 
+// The touch id to be used for touch events coming in from Windows Aura
+// Desktop.
+const int kDesktopChromeAuraTouchId = 9;

[sky, 2013/01/07 15:53:45]

Do we need to make sure this doesn't conflict with anything?

[ananta, 2013/01/08 00:50:22]

We shouldn't be conflicting with anything. We have a limit of 12 touch event
sources with only one among them being active in a session. Exception being ASH
and desktop Chrome. Ash uses 10 as the touch id and desktop chrome with this
change will use 9.

+
 }  // namespace
 
 // A scoping class that prevents a window from being able to redraw in response
 // to invalidations that may occur within it for the lifetime of the object.
 //
 // Why would we want such a thing? Well, it turns out Windows has some
 // "unorthodox" behavior when it comes to painting its non-client areas.
 // Occasionally, Windows will paint portions of the default non-client area
 // right over the top of the custom frame. This is not simply fixed by handling
 // WM_NCPAINT/WM_PAINT, with some investigation it turns out that this
@@ skipping 1659 matching lines @@
 }
 
 LRESULT HWNDMessageHandler::OnTouchEvent(UINT message,
                                          WPARAM w_param,
                                          LPARAM l_param) {
   int num_points = LOWORD(w_param);
   scoped_array<TOUCHINPUT> input(new TOUCHINPUT[num_points]);
   if (GetTouchInputInfo(reinterpret_cast<HTOUCHINPUT>(l_param),
                         num_points, input.get(), sizeof(TOUCHINPUT))) {
     for (int i = 0; i < num_points; ++i) {
-      if (input[i].dwFlags & TOUCHEVENTF_DOWN)
+      ui::EventType touch_event_type = ui::ET_UNKNOWN;
+
+      if (input[i].dwFlags & TOUCHEVENTF_DOWN) {
         touch_ids_.insert(input[i].dwID);
-      if (input[i].dwFlags & TOUCHEVENTF_UP)
+        touch_event_type = ui::ET_TOUCH_PRESSED;
+      } else if (input[i].dwFlags & TOUCHEVENTF_UP) {
         touch_ids_.erase(input[i].dwID);
+        touch_event_type = ui::ET_TOUCH_RELEASED;
+      } else if (input[i].dwFlags & TOUCHEVENTF_MOVE) {
+        touch_event_type = ui::ET_TOUCH_MOVED;
+      }
+
+      if (touch_event_type != ui::ET_UNKNOWN) {
+        ui::TouchEvent event(
+            touch_event_type,
+            gfx::Point(TOUCH_COORD_TO_PIXEL(input[i].x),
+                       TOUCH_COORD_TO_PIXEL(input[i].y)),
+            kDesktopChromeAuraTouchId,
+            base::TimeDelta::FromMilliseconds(input[i].dwTime));
+        delegate_->HandleTouchEvent(event);
+      }
     }
   }
   CloseTouchInputHandle(reinterpret_cast<HTOUCHINPUT>(l_param));
   SetMsgHandled(FALSE);
   return 0;
 }
 
 void HWNDMessageHandler::OnWindowPosChanging(WINDOWPOS* window_pos) {
   if (ignore_window_pos_changes_) {
     // If somebody's trying to toggle our visibility, change the nonclient area,
@@ skipping 79 matching lines @@
     DwmExtendFrameIntoClientArea(hwnd(), &m);
   }
   if (window_pos->flags & SWP_SHOWWINDOW)
     delegate_->HandleVisibilityChanged(true);
   else if (window_pos->flags & SWP_HIDEWINDOW)
     delegate_->HandleVisibilityChanged(false);
   SetMsgHandled(FALSE);
 }
 
 }  // namespace views