cursor_window_controller.cc revision c5cede9ae108bb15f6b7a8aea21c7e1fefa2834c 
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  display_ = Shell::GetScreen()->GetPrimaryDisplay();
117  if (is_cursor_compositing_enabled_) {
118    SetDisplay(display_);
119  } else {
120    aura::WindowTreeHost* mirror_host = Shell::GetInstance()->
121        display_controller()->mirror_window_controller()->host();
122    SetContainer(mirror_host ? mirror_host->window() : NULL);
123  }
124}
125
126void CursorWindowController::SetDisplay(const gfx::Display& display) {
127  if (!is_cursor_compositing_enabled_)
128    return;
129
130  display_ = display;
131  aura::Window* root_window = Shell::GetInstance()->display_controller()->
132      GetRootWindowForDisplayId(display.id());
133  if (!root_window)
134    return;
135
136  SetContainer(GetRootWindowController(root_window)->GetContainer(
137      kShellWindowId_MouseCursorContainer));
138  SetBoundsInScreen(display.bounds());
139}
140
141void CursorWindowController::UpdateLocation() {
142  if (!cursor_window_)
143    return;
144
145  gfx::Point point = aura::Env::GetInstance()->last_mouse_location();
146  if (!is_cursor_compositing_enabled_) {
147    Shell::GetPrimaryRootWindow()->GetHost()->ConvertPointToHost(&point);
148  } else {
149    point.Offset(-bounds_in_screen_.x(), -bounds_in_screen_.y());
150  }
151  point.Offset(-hot_point_.x(), -hot_point_.y());
152  gfx::Rect bounds = cursor_window_->bounds();
153  bounds.set_origin(point);
154  cursor_window_->SetBounds(bounds);
155}
156
157void CursorWindowController::SetCursor(gfx::NativeCursor cursor) {
158  if (cursor_type_ == cursor.native_type() &&
159      cursor_rotation_ == display_.rotation())
160    return;
161  cursor_type_ = cursor.native_type();
162  cursor_rotation_ = display_.rotation();
163  UpdateCursorImage();
164}
165
166void CursorWindowController::SetCursorSet(ui::CursorSetType cursor_set) {
167  cursor_set_ = cursor_set;
168  UpdateCursorImage();
169}
170
171void CursorWindowController::SetVisibility(bool visible) {
172  if (!cursor_window_)
173    return;
174  if (visible)
175    cursor_window_->Show();
176  else
177    cursor_window_->Hide();
178}
179
180void CursorWindowController::SetContainer(aura::Window* container) {
181  if (container_ == container)
182    return;
183
184  container_ = container;
185  if (!container) {
186    cursor_window_.reset();
187    return;
188  }
189
190  if (!cursor_window_) {
191    cursor_window_.reset(new aura::Window(delegate_.get()));
192    cursor_window_->SetTransparent(true);
193    cursor_window_->Init(aura::WINDOW_LAYER_TEXTURED);
194    cursor_window_->set_ignore_events(true);
195    cursor_window_->set_owned_by_parent(false);
196  }
197
198  container->AddChild(cursor_window_.get());
199  cursor_window_->Show();
200  SetBoundsInScreen(container->bounds());
201}
202
203void CursorWindowController::SetBoundsInScreen(const gfx::Rect& bounds) {
204  bounds_in_screen_ = bounds;
205  UpdateLocation();
206}
207
208void CursorWindowController::UpdateCursorImage() {
209  int resource_id;
210  // TODO(hshi): support custom cursor set.
211  if (!ui::GetCursorDataFor(cursor_set_,
212                            cursor_type_,
213                            display_.device_scale_factor(),
214                            &resource_id,
215                            &hot_point_)) {
216    return;
217  }
218  const gfx::ImageSkia* image =
219      ResourceBundle::GetSharedInstance().GetImageSkiaNamed(resource_id);
220  gfx::ImageSkia rotated = *image;
221  if (!is_cursor_compositing_enabled_) {
222    switch (cursor_rotation_) {
223      case gfx::Display::ROTATE_0:
224        break;
225      case gfx::Display::ROTATE_90:
226        rotated = gfx::ImageSkiaOperations::CreateRotatedImage(
227            *image, SkBitmapOperations::ROTATION_90_CW);
228        hot_point_.SetPoint(
229            rotated.width() - hot_point_.y(),
230            hot_point_.x());
231        break;
232      case gfx::Display::ROTATE_180:
233        rotated = gfx::ImageSkiaOperations::CreateRotatedImage(
234            *image, SkBitmapOperations::ROTATION_180_CW);
235        hot_point_.SetPoint(
236            rotated.height() - hot_point_.x(),
237            rotated.width() - hot_point_.y());
238        break;
239      case gfx::Display::ROTATE_270:
240        rotated = gfx::ImageSkiaOperations::CreateRotatedImage(
241            *image, SkBitmapOperations::ROTATION_270_CW);
242        hot_point_.SetPoint(
243            hot_point_.y(),
244            rotated.height() - hot_point_.x());
245        break;
246    }
247  } else {
248    hot_point_ = ui::ConvertPointToDIP(Shell::GetPrimaryRootWindow()->layer(),
249                                       hot_point_);
250  }
251  delegate_->SetCursorImage(rotated, display_);
252  if (cursor_window_) {
253    cursor_window_->SetBounds(gfx::Rect(delegate_->size()));
254    cursor_window_->SchedulePaintInRect(
255        gfx::Rect(cursor_window_->bounds().size()));
256    UpdateLocation();
257  }
258}
259
260}  // namespace ash
261