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

content/browser/web_contents/web_contents_drag_win.cc

Index: content/browser/web_contents/web_contents_drag_win.cc
diff --git a/content/browser/web_contents/web_contents_drag_win.cc b/content/browser/web_contents/web_contents_drag_win.cc
index 9153808d985b3d45cf5d630bc5d0f7d18e38d87d..5ff55d138b37c08a38ae6891d2886f51c104d15c 100644
--- a/content/browser/web_contents/web_contents_drag_win.cc
+++ b/content/browser/web_contents/web_contents_drag_win.cc
@@ -18,6 +18,7 @@
 #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"
@@ -51,6 +52,7 @@ 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 &&
@@ -59,18 +61,22 @@ LRESULT CALLBACK MsgFilterProc(int code, WPARAM wparam, LPARAM 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;
     }
   }
@@ -166,8 +172,18 @@ void WebContentsDragWin::StartDragging(const WebDropData& drop_data,
   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();
@@ -188,6 +204,8 @@ void WebContentsDragWin::StartDragging(const WebDropData& drop_data,
   }
 
   EnableBackgroundDraggingSupport(drag_drop_thread_->thread_id());
+  if (rwhv->in_long_press_gesture())
+    SendMouseEventForTouchDnD();
 }
 
 void WebContentsDragWin::StartBackgroundDragging(
@@ -412,9 +430,49 @@ void WebContentsDragWin::CloseThread() {
   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.