cursor_window_controller.cc revision f8ee788a64d60abd8f2d742a5fdedde054ecd910 
1// Copyright 2014 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/display/cursor_window_controller.h"
6
7#include "ash/display/display_controller.h"
8#include "ash/display/mirror_window_controller.h"
9#include "ash/root_window_controller.h"
10#include "ash/shell.h"
11#include "ash/shell_window_ids.h"
12#include "ui/aura/env.h"
13#include "ui/aura/window_delegate.h"
14#include "ui/aura/window_event_dispatcher.h"
15#include "ui/base/cursor/cursors_aura.h"
16#include "ui/base/hit_test.h"
17#include "ui/base/resource/resource_bundle.h"
18#include "ui/compositor/dip_util.h"
19#include "ui/gfx/canvas.h"
20#include "ui/gfx/display.h"
21#include "ui/gfx/image/image_skia.h"
22#include "ui/gfx/image/image_skia_operations.h"
23
24namespace ash {
25
26class CursorWindowDelegate : public aura::WindowDelegate {
27 public:
28  CursorWindowDelegate() : is_cursor_compositing_enabled_(false) {}
29  virtual ~CursorWindowDelegate() {}
30
31  // aura::WindowDelegate overrides:
32  virtual gfx::Size GetMinimumSize() const OVERRIDE { return size_; }
33  virtual gfx::Size GetMaximumSize() const OVERRIDE { return size_; }
34  virtual void OnBoundsChanged(const gfx::Rect& old_bounds,
35                               const gfx::Rect& new_bounds) OVERRIDE {}
36  virtual gfx::NativeCursor GetCursor(const gfx::Point& point) OVERRIDE {
37    return gfx::kNullCursor;
38  }
39  virtual int GetNonClientComponent(
40      const gfx::Point& point) const OVERRIDE {
41    return HTNOWHERE;
42  }
43  virtual bool ShouldDescendIntoChildForEventHandling(
44      aura::Window* child,
45      const gfx::Point& location) OVERRIDE {
46    return false;
47  }
48  virtual bool CanFocus() OVERRIDE { return false; }
49  virtual void OnCaptureLost() OVERRIDE {}
50  virtual void OnPaint(gfx::Canvas* canvas) OVERRIDE {
51    canvas->DrawImageInt(cursor_image_, 0, 0);
52  }
53  virtual void OnDeviceScaleFactorChanged(
54      float device_scale_factor) OVERRIDE {}
55  virtual void OnWindowDestroying(aura::Window* window) OVERRIDE {}
56  virtual void OnWindowDestroyed(aura::Window* window) OVERRIDE {}
57  virtual void OnWindowTargetVisibilityChanged(bool visible) OVERRIDE {}
58  virtual bool HasHitTestMask() const OVERRIDE { return false; }
59  virtual void GetHitTestMask(gfx::Path* mask) const OVERRIDE {}
60
61  // Sets cursor compositing mode on/off.
62  void SetCursorCompositingEnabled(bool enabled) {
63    is_cursor_compositing_enabled_ = enabled;
64  }
65
66  // Sets the cursor image for the |display|'s scale factor.
67  void SetCursorImage(const gfx::ImageSkia& image,
68                      const gfx::Display& display) {
69    float scale_factor = display.device_scale_factor();
70    const gfx::ImageSkiaRep& image_rep = image.GetRepresentation(scale_factor);
71    if (!is_cursor_compositing_enabled_) {
72      // Note that mirror window's scale factor is always 1.0f, therefore we
73      // need to take 2x's image and paint as if it's 1x image.
74      size_ = image_rep.pixel_size();
75      cursor_image_ = gfx::ImageSkia::CreateFrom1xBitmap(image_rep.sk_bitmap());
76    } else {
77      size_ = image.size();
78      cursor_image_ = gfx::ImageSkia(
79          gfx::ImageSkiaRep(image_rep.sk_bitmap(), scale_factor));
80    }
81  }
82
83  const gfx::Size size() const { return size_; }
84
85 private:
86  bool is_cursor_compositing_enabled_;
87  gfx::ImageSkia cursor_image_;
88  gfx::Size size_;
89
90  DISALLOW_COPY_AND_ASSIGN(CursorWindowDelegate);
91};
92
93CursorWindowController::CursorWindowController()
94    : is_cursor_compositing_enabled_(false),
95      container_(NULL),
96      cursor_type_(ui::kCursorNone),
97      cursor_set_(ui::CURSOR_SET_NORMAL),
98      cursor_rotation_(gfx::Display::ROTATE_0),
99      delegate_(new CursorWindowDelegate()) {
100}
101
102CursorWindowController::~CursorWindowController() {
103  SetContainer(NULL);
104}
105
106void CursorWindowController::SetCursorCompositingEnabled(bool enabled) {
107  if (is_cursor_compositing_enabled_ != enabled) {
108    is_cursor_compositing_enabled_ = enabled;
109    delegate_->SetCursorCompositingEnabled(enabled);
110    UpdateCursorImage();
111    UpdateContainer();
112  }
113}
114
115void CursorWindowController::UpdateContainer() {
116  if (is_cursor_compositing_enabled_) {
117    gfx::Screen* screen = Shell::GetScreen();
118    gfx::Display display = screen->GetDisplayNearestPoint(
119        screen->GetCursorScreenPoint());
120    DCHECK(display.is_valid());
121    if (display.is_valid())
122      SetDisplay(display);
123  } else {
124    aura::Window* mirror_window = Shell::GetInstance()->
125        display_controller()->
126        mirror_window_controller()->
127        GetWindow();
128    if (mirror_window)
129      display_ = Shell::GetScreen()->GetPrimaryDisplay();
130    SetContainer(mirror_window);
131  }
132}
133
134void CursorWindowController::SetDisplay(const gfx::Display& display) {
135  if (!is_cursor_compositing_enabled_)
136    return;
137
138  display_ = display;
139  aura::Window* root_window = Shell::GetInstance()->display_controller()->
140      GetRootWindowForDisplayId(display.id());
141  if (!root_window)
142    return;
143
144  SetContainer(GetRootWindowController(root_window)->GetContainer(
145      kShellWindowId_MouseCursorContainer));
146  SetBoundsInScreen(display.bounds());
147}
148
149void CursorWindowController::UpdateLocation() {
150  if (!cursor_window_)
151    return;
152  gfx::Point point = aura::Env::GetInstance()->last_mouse_location();
153  if (!is_cursor_compositing_enabled_) {
154    Shell::GetPrimaryRootWindow()->GetHost()->ConvertPointToHost(&point);
155  } else {
156    point.Offset(-bounds_in_screen_.x(), -bounds_in_screen_.y());
157  }
158  point.Offset(-hot_point_.x(), -hot_point_.y());
159  gfx::Rect bounds = cursor_window_->bounds();
160  bounds.set_origin(point);
161  cursor_window_->SetBounds(bounds);
162}
163
164void CursorWindowController::SetCursor(gfx::NativeCursor cursor) {
165  if (cursor_type_ == cursor.native_type() &&
166      cursor_rotation_ == display_.rotation())
167    return;
168  cursor_type_ = cursor.native_type();
169  cursor_rotation_ = display_.rotation();
170  UpdateCursorImage();
171}
172
173void CursorWindowController::SetCursorSet(ui::CursorSetType cursor_set) {
174  cursor_set_ = cursor_set;
175  UpdateCursorImage();
176}
177
178void CursorWindowController::SetVisibility(bool visible) {
179  if (!cursor_window_)
180    return;
181  if (visible)
182    cursor_window_->Show();
183  else
184    cursor_window_->Hide();
185}
186
187void CursorWindowController::SetContainer(aura::Window* container) {
188  if (container_ == container)
189    return;
190  container_ = container;
191  if (!container) {
192    cursor_window_.reset();
193    return;
194  }
195
196  // Reusing the window does not work when the display is disconnected.
197  // Just creates a new one instead. crbug.com/384218.
198  cursor_window_.reset(new aura::Window(delegate_.get()));
199  cursor_window_->SetTransparent(true);
200  cursor_window_->Init(aura::WINDOW_LAYER_TEXTURED);
201  cursor_window_->set_ignore_events(true);
202  cursor_window_->set_owned_by_parent(false);
203  UpdateCursorImage();
204
205  container->AddChild(cursor_window_.get());
206  cursor_window_->Show();
207  SetBoundsInScreen(container->bounds());
208}
209
210void CursorWindowController::SetBoundsInScreen(const gfx::Rect& bounds) {
211  bounds_in_screen_ = bounds;
212  UpdateLocation();
213}
214
215void CursorWindowController::UpdateCursorImage() {
216  int resource_id;
217  // TODO(hshi): support custom cursor set.
218  if (!ui::GetCursorDataFor(cursor_set_,
219                            cursor_type_,
220                            display_.device_scale_factor(),
221                            &resource_id,
222                            &hot_point_)) {
223    return;
224  }
225  const gfx::ImageSkia* image =
226      ResourceBundle::GetSharedInstance().GetImageSkiaNamed(resource_id);
227  gfx::ImageSkia rotated = *image;
228  if (!is_cursor_compositing_enabled_) {
229    switch (cursor_rotation_) {
230      case gfx::Display::ROTATE_0:
231        break;
232      case gfx::Display::ROTATE_90:
233        rotated = gfx::ImageSkiaOperations::CreateRotatedImage(
234            *image, SkBitmapOperations::ROTATION_90_CW);
235        hot_point_.SetPoint(
236            rotated.width() - hot_point_.y(),
237            hot_point_.x());
238        break;
239      case gfx::Display::ROTATE_180:
240        rotated = gfx::ImageSkiaOperations::CreateRotatedImage(
241            *image, SkBitmapOperations::ROTATION_180_CW);
242        hot_point_.SetPoint(
243            rotated.height() - hot_point_.x(),
244            rotated.width() - hot_point_.y());
245        break;
246      case gfx::Display::ROTATE_270:
247        rotated = gfx::ImageSkiaOperations::CreateRotatedImage(
248            *image, SkBitmapOperations::ROTATION_270_CW);
249        hot_point_.SetPoint(
250            hot_point_.y(),
251            rotated.height() - hot_point_.x());
252        break;
253    }
254  } else {
255    hot_point_ = ui::ConvertPointToDIP(Shell::GetPrimaryRootWindow()->layer(),
256                                       hot_point_);
257  }
258  delegate_->SetCursorImage(rotated, display_);
259  if (cursor_window_) {
260    cursor_window_->SetBounds(gfx::Rect(delegate_->size()));
261    cursor_window_->SchedulePaintInRect(
262        gfx::Rect(cursor_window_->bounds().size()));
263    UpdateLocation();
264  }
265}
266
267}  // namespace ash
268