Enable touch-initiated drag-drop work on Windows

content/browser/web_contents/web_drag_source_win.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 "content/browser/web_contents/web_drag_source_win.h"
 
 #include "base/bind.h"
 #include "content/browser/renderer_host/render_view_host_impl.h"
+#include "content/browser/renderer_host/render_widget_host_view_win.h"
 #include "content/browser/web_contents/web_drag_utils_win.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/notification_source.h"
 #include "content/public/browser/notification_types.h"
 #include "content/public/browser/web_contents.h"
 
 using WebKit::WebDragOperationNone;
 
 namespace content {
 namespace {
@@ skipping 38 matching lines @@
 
   if (!render_view_host_)
     return;
 
   gfx::Point client;
   gfx::Point screen;
   GetCursorPositions(source_wnd_, &client, &screen);
   render_view_host_->DragSourceEndedAt(client.x(), client.y(),
                                        screen.x(), screen.y(),
                                        WebDragOperationNone);
+  OnDragSourceEnded();
 }
 
 void WebDragSource::OnDragSourceDrop() {
   // On Windows, we check for drag end in IDropSource::QueryContinueDrag which
   // happens before IDropTarget::Drop is called. HTML5 requires the "dragend"
   // event to happen after the "drop" event. Since  Windows calls these two
   // directly after each other we can just post a task to handle the
   // OnDragSourceDrop after the current task.
   BrowserThread::PostTask(
       BrowserThread::UI, FROM_HERE,
       base::Bind(&WebDragSource::DelayedOnDragSourceDrop, this));
 }
 
 void WebDragSource::DelayedOnDragSourceDrop() {
   if (!render_view_host_)
     return;
-
   gfx::Point client;
   gfx::Point screen;
   GetCursorPositions(source_wnd_, &client, &screen);
   render_view_host_->DragSourceEndedAt(
       client.x(), client.y(), screen.x(), screen.y(),
       WinDragOpToWebDragOp(effect_));
+  OnDragSourceEnded();
+}
+
+void WebDragSource::OnDragSourceEnded() {
+  if (!render_view_host_)
+    return;
+
+  RenderWidgetHostViewWin* rwhv =
+      static_cast<RenderWidgetHostViewWin*>(render_view_host_->GetView());
+  if (rwhv->has_valid_long_press_gesture())
+    rwhv->CancelLongPressGesture();
 }
 
 void WebDragSource::OnDragSourceMove() {
   // Delegate to the UI thread if we do drag-and-drop in the background thread.
   if (!BrowserThread::CurrentlyOn(BrowserThread::UI)) {
     BrowserThread::PostTask(
         BrowserThread::UI, FROM_HERE,
         base::Bind(&WebDragSource::OnDragSourceMove, this));
     return;
   }
 
   if (!render_view_host_)
     return;
-
   gfx::Point client;
   gfx::Point screen;
   GetCursorPositions(source_wnd_, &client, &screen);
   render_view_host_->DragSourceMovedTo(client.x(), client.y(),
                                        screen.x(), screen.y());
 }
 
+bool WebDragSource::ShouldDropDragSource(
+    BOOL escape_pressed, DWORD key_state) {
+  // We also care about right mouse button state since long press gesture is
+  // simulated as right mouse button down/up.
+  return !(key_state & MK_LBUTTON) && !(key_state & MK_RBUTTON);
+}
+
 void WebDragSource::Observe(int type,
                             const NotificationSource& source,
                             const NotificationDetails& details) {
   if (type == NOTIFICATION_WEB_CONTENTS_SWAPPED) {
     // When the WebContents get swapped, our render view host goes away.
     // That's OK, we can continue the drag, we just can't send messages back to
     // our drag source.
     render_view_host_ = NULL;
   } else if (type == NOTIFICATION_WEB_CONTENTS_DISCONNECTED) {
     // This could be possible when we close the tab and the source is still
     // being used in DoDragDrop at the time that the virtual file is being
     // downloaded.
     render_view_host_ = NULL;
   }
 }
 
 }  // namespace content