Touch-initiated drag-out to download file but fails.

content/browser/web_contents/web_contents_drag_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_contents_drag_win.h"
 
 #include <windows.h>
 
 #include <string>
 
 #include "base/bind.h"
 #include "base/file_util.h"
 #include "base/files/file_path.h"
 #include "base/message_loop.h"
 #include "base/pickle.h"
 #include "base/threading/platform_thread.h"
 #include "base/threading/thread.h"
 #include "base/utf_string_conversions.h"
 #include "content/browser/download/drag_download_file.h"
 #include "content/browser/download/drag_download_util.h"
+#include "content/browser/renderer_host/render_widget_host_view_win.h"
 #include "content/browser/web_contents/web_drag_dest_win.h"
 #include "content/browser/web_contents/web_drag_source_win.h"
 #include "content/browser/web_contents/web_drag_utils_win.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/content_browser_client.h"
 #include "content/public/browser/web_contents.h"
 #include "content/public/browser/web_contents_view.h"
 #include "content/public/browser/web_drag_dest_delegate.h"
 #include "net/base/net_util.h"
 #include "third_party/skia/include/core/SkBitmap.h"
@@ skipping 13 matching lines @@
 using WebKit::WebDragOperationMove;
 
 namespace content {
 namespace {
 
 bool run_do_drag_drop = true;
 
 HHOOK msg_hook = NULL;
 DWORD drag_out_thread_id = 0;
 bool mouse_up_received = false;
+const int kMaxAbsoluteCoordinate = 65535;
 
 LRESULT CALLBACK MsgFilterProc(int code, WPARAM wparam, LPARAM lparam) {
   if (code == base::MessagePumpForUI::kMessageFilterCode &&
       !mouse_up_received) {
     MSG* msg = reinterpret_cast<MSG*>(lparam);
     // We do not care about WM_SYSKEYDOWN and WM_SYSKEYUP because when ALT key
     // is pressed down on drag-and-drop, it means to create a link.
     if (msg->message == WM_MOUSEMOVE || msg->message == WM_LBUTTONUP ||
-        msg->message == WM_KEYDOWN || msg->message == WM_KEYUP) {
+        msg->message == WM_KEYDOWN || msg->message == WM_KEYUP ||
+        msg->message == WM_RBUTTONUP) {
       // Forward the message from the UI thread to the drag-and-drop thread.
       PostThreadMessage(drag_out_thread_id,
                         msg->message,
                         msg->wParam,
                         msg->lParam);
 
-      // If the left button is up, we do not need to forward the message any
-      // more.
+      // If the left/right button is up, we do not need to forward the message
+      // any more.
       if (msg->message == WM_LBUTTONUP || !(GetKeyState(VK_LBUTTON) & 0x8000))
         mouse_up_received = true;
 
+      if (msg->message == WM_RBUTTONUP || !(GetKeyState(VK_RBUTTON) & 0x8000))
+        mouse_up_received = true;
+
       return TRUE;
     }
   }
   return CallNextHookEx(msg_hook, code, wparam, lparam);
 }
 
 void EnableBackgroundDraggingSupport(DWORD thread_id) {
   // Install a hook procedure to monitor the messages so that we can forward
   // the appropriate ones to the background thread.
   drag_out_thread_id = thread_id;
@@ skipping 75 matching lines @@
                                        WebDragOperationsMask ops,
                                        const gfx::ImageSkia& image,
                                        const gfx::Vector2d& image_offset) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 
   drag_source_ = new WebDragSource(source_window_, web_contents_);
 
   const GURL& page_url = web_contents_->GetURL();
   const std::string& page_encoding = web_contents_->GetEncoding();
 
+  RenderWidgetHostViewWin* rwhv =
+      static_cast<RenderWidgetHostViewWin*>
+          (web_contents_->GetRenderWidgetHostView());
   // If it is not drag-out, do the drag-and-drop in the current UI thread.
   if (drop_data.download_metadata.empty()) {
+    // If RWHV has a valid long press gesture, since DoDragDrop will run into
+    // itself loop and start a dragging session if and only if a mouse button
+    // is down and then moves, so we need to programmatically send out
+    // mouse down event and adjust the cursor position for DoDragDrop.
+    if (rwhv->in_long_press_gesture())
+      SendMouseEventForTouchDnD();
+
     if (DoDragging(drop_data, ops, page_url, page_encoding,
                    image, image_offset))
       EndDragging();
     return;
   }
 
   // Start a background thread to do the drag-and-drop.
   DCHECK(!drag_drop_thread_.get());
   drag_drop_thread_.reset(new DragDropThread(this));
   base::Thread::Options options;
   options.message_loop_type = base::MessageLoop::TYPE_UI;
   if (drag_drop_thread_->StartWithOptions(options)) {
     drag_drop_thread_->message_loop()->PostTask(
         FROM_HERE,
         base::Bind(&WebContentsDragWin::StartBackgroundDragging, this,
                    drop_data, ops, page_url, page_encoding,
                    image, image_offset));
   }
 
   EnableBackgroundDraggingSupport(drag_drop_thread_->thread_id());
+  if (rwhv->in_long_press_gesture())
+    SendMouseEventForTouchDnD();
 }
 
 void WebContentsDragWin::StartBackgroundDragging(
     const WebDropData& drop_data,
     WebDragOperationsMask ops,
     const GURL& page_url,
     const std::string& page_encoding,
     const gfx::ImageSkia& image,
     const gfx::Vector2d& image_offset) {
   drag_drop_thread_id_ = base::PlatformThread::CurrentId();
@@ skipping 204 matching lines @@
 
   drag_source_->CancelDrag();
 }
 
 void WebContentsDragWin::CloseThread() {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 
   drag_drop_thread_.reset();
 }
 
+void WebContentsDragWin::SendMouseEventForTouchDnD() {
+  RenderWidgetHostViewWin* rwhv =
+      static_cast<RenderWidgetHostViewWin*>
+          (web_contents_->GetRenderWidgetHostView());
+
+  if (!rwhv)
+    return;
+
+  RECT screen_rect;
+  ::GetWindowRect(::GetDesktopWindow(), &screen_rect);
+  int screen_width = screen_rect.right - screen_rect.left;
+  int screen_height = screen_rect.bottom - screen_rect.top;
+  gfx::Point last_touch_position = rwhv->GetLastTouchEventLocation();
+
+  // Map the screen coordinate to the normalized absolute coordinate.
+  int absolute_x =
+      last_touch_position.x() * kMaxAbsoluteCoordinate / screen_width;
+  int absolute_y =
+      last_touch_position.y() * kMaxAbsoluteCoordinate / screen_height;
+
+  // Send MOUSEEVENTF_RIGHTDOWN event followed by MOUSEEVENTF_MOVE event.
+  // The reason why not to merge these 2 mouse events into one is, we don't
+  // want DoDragDrop to get mouse event firstly which lead to drop the drag
+  // source. Once a touch point is removed from screen after long press,
+  // a MOUSEEVENTF_RIGHTUP event will be sent out, so we send the down event
+  // paired with it to complete DoDragDrop session.
+  INPUT ip = { 0 };
+  ip.type = INPUT_MOUSE;
+  ip.mi.dwFlags = MOUSEEVENTF_RIGHTDOWN | MOUSEEVENTF_ABSOLUTE;
+  ip.mi.dx = absolute_x;
+  ip.mi.dy = absolute_y;
+  ::SendInput(1, &ip, sizeof(INPUT));
+
+  // Send MOUSEEVENTF_MOVE input event to set cursor to the right position.
+  ip.mi.dwFlags = MOUSEEVENTF_MOVE | MOUSEEVENTF_ABSOLUTE;
+  ::SendInput(1, &ip, sizeof(INPUT));
+}
+
 void WebContentsDragWin::OnWaitForData() {
   DCHECK(drag_drop_thread_id_ == base::PlatformThread::CurrentId());
 
+  LOG(INFO) << "call WebContentsDragWin::OnWaitForData";
+
   // When the left button is release and we start to wait for the data, end
   // the dragging before DoDragDrop returns. This makes the page leave the drag
   // mode so that it can start to process the normal input events.
   BrowserThread::PostTask(
       BrowserThread::UI,
       FROM_HERE,
       base::Bind(&WebContentsDragWin::EndDragging, this));
 }
 
 void WebContentsDragWin::OnDataObjectDisposed() {
   DCHECK(drag_drop_thread_id_ == base::PlatformThread::CurrentId());
 
   // The drag-and-drop thread is only closed after OLE is done with
   // DataObjectImpl.
   BrowserThread::PostTask(
       BrowserThread::UI,
       FROM_HERE,
       base::Bind(&WebContentsDragWin::CloseThread, this));
 }
 
 // static
 void WebContentsDragWin::DisableDragDropForTesting() {
   run_do_drag_drop = false;
 }
 
 }  // namespace content