Allows menu host windows to be enumerated in DragTargetWindowFinder

ui/views/widget/desktop_aura/x11_whole_screen_move_loop.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/x11_whole_screen_move_loop.h"
 
 #include <X11/Xlib.h>
 // Get rid of a macro from Xlib.h that conflicts with Aura's RootWindow class.
 #undef RootWindow
 
@@ skipping 13 matching lines @@
 #include "ui/views/controls/image_view.h"
 #include "ui/views/widget/widget.h"
 
 namespace views {
 
 namespace {
 
 // The minimum alpha before we declare a pixel transparent when searching in
 // our source image.
 const uint32 kMinAlpha = 32;
+const unsigned char kDragWidgetOpacity = 0xc0;
 
 class ScopedCapturer {
  public:
   explicit ScopedCapturer(aura::WindowTreeHost* host)
       : host_(host) {
     host_->SetCapture();
   }
 
   ~ScopedCapturer() {
     host_->ReleaseCapture();
@@ skipping 25 matching lines @@
 
   // Note: the escape key is handled in the tab drag controller, which has
   // keyboard focus even though we took pointer grab.
   switch (xev->type) {
     case MotionNotify: {
       if (drag_widget_.get()) {
         gfx::Screen* screen = gfx::Screen::GetNativeScreen();
         gfx::Point location = gfx::ToFlooredPoint(
             screen->GetCursorScreenPoint() - drag_offset_);
         drag_widget_->SetBounds(gfx::Rect(location, drag_image_.size()));
+        drag_widget_->StackAtTop();
       }
       delegate_->OnMouseMovement(&xev->xmotion);
       break;
     }
     case ButtonRelease: {
       if (xev->xbutton.button == Button1) {
         // Assume that drags are being done with the left mouse button. Only
         // break the drag if the left mouse button was released.
         delegate_->OnMouseReleased();
       }
@@ skipping 171 matching lines @@
   params.opacity = Widget::InitParams::OPAQUE_WINDOW;
   params.ownership = Widget::InitParams::WIDGET_OWNS_NATIVE_WIDGET;
   params.accept_events = false;
 
   gfx::Point location = gfx::ToFlooredPoint(
       gfx::Screen::GetNativeScreen()->GetCursorScreenPoint() - drag_offset_);
   params.bounds = gfx::Rect(location, drag_image_.size());
   widget->set_focus_on_creation(false);
   widget->set_frame_type(Widget::FRAME_TYPE_FORCE_NATIVE);
   widget->Init(params);
+  widget->SetOpacity(kDragWidgetOpacity);
   widget->GetNativeWindow()->SetName("DragWindow");
 
   ImageView* image = new ImageView();
   image->SetImage(drag_image_);
   image->SetBounds(0, 0, drag_image_.width(), drag_image_.height());
   widget->SetContentsView(image);
   widget->Show();
   widget->GetNativeWindow()->layer()->SetFillsBoundsOpaquely(false);
 
   drag_widget_.reset(widget);
@@ skipping 19 matching lines @@
     for (int x = 0; x < in_bitmap->width(); ++x) {
       if (SkColorGetA(in_row[x]) > kMinAlpha)
         return true;
     }
   }
 
   return false;
 }
 
 }  // namespace views