1// Copyright (c) 2012 The Chromium Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5#include "ash/drag_drop/drag_drop_tracker.h"
6
7#include "ash/shell.h"
8#include "ash/shell_window_ids.h"
9#include "ash/wm/coordinate_conversion.h"
10#include "ui/aura/root_window.h"
11#include "ui/base/events/event.h"
12#include "ui/gfx/screen.h"
13
14namespace ash {
15namespace internal {
16
17namespace {
18
19// Creates a window for capturing drag events.
20aura::Window* CreateCaptureWindow(aura::RootWindow* context_root,
21                                  aura::WindowDelegate* delegate) {
22  aura::Window* window = new aura::Window(delegate);
23  window->SetType(aura::client::WINDOW_TYPE_NORMAL);
24  window->Init(ui::LAYER_NOT_DRAWN);
25  window->SetDefaultParentByRootWindow(context_root, gfx::Rect());
26  window->Show();
27  DCHECK(window->bounds().size().IsEmpty());
28  return window;
29}
30
31}  // namespace
32
33DragDropTracker::DragDropTracker(aura::RootWindow* context_root,
34                                 aura::WindowDelegate* delegate)
35    : capture_window_(CreateCaptureWindow(context_root, delegate)) {
36}
37
38DragDropTracker::~DragDropTracker()  {
39  capture_window_->ReleaseCapture();
40}
41
42void DragDropTracker::TakeCapture() {
43  capture_window_->SetCapture();
44}
45
46aura::Window* DragDropTracker::GetTarget(const ui::LocatedEvent& event) {
47  DCHECK(capture_window_.get());
48  gfx::Point location_in_screen = event.location();
49  wm::ConvertPointToScreen(capture_window_.get(),
50                           &location_in_screen);
51  aura::RootWindow* root_window_at_point =
52      wm::GetRootWindowAt(location_in_screen);
53  gfx::Point location_in_root = location_in_screen;
54  wm::ConvertPointFromScreen(root_window_at_point, &location_in_root);
55  return root_window_at_point->GetEventHandlerForPoint(location_in_root);
56}
57
58ui::LocatedEvent* DragDropTracker::ConvertEvent(
59    aura::Window* target,
60    const ui::LocatedEvent& event) {
61  DCHECK(capture_window_.get());
62  gfx::Point target_location = event.location();
63  aura::Window::ConvertPointToTarget(capture_window_.get(), target,
64                                     &target_location);
65  gfx::Point location_in_screen = event.location();
66  ash::wm::ConvertPointToScreen(capture_window_.get(), &location_in_screen);
67  gfx::Point target_root_location = event.root_location();
68  aura::Window::ConvertPointToTarget(
69      capture_window_->GetRootWindow(),
70      ash::wm::GetRootWindowAt(location_in_screen),
71      &target_root_location);
72  return new ui::MouseEvent(event.type(),
73                            target_location,
74                            target_root_location,
75                            event.flags());
76}
77
78}  // namespace internal
79}  // namespace ash
80