cursor_window_controller.cc revision a02191e04bc25c4935f804f2c080ae28663d096d 
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    SetContainer(Shell::GetInstance()->
121                 display_controller()->
122                 mirror_window_controller()->
123                 GetWindow());
124  }
125}
126
127void CursorWindowController::SetDisplay(const gfx::Display& display) {
128  if (!is_cursor_compositing_enabled_)
129    return;
130
131  display_ = display;
132  aura::Window* root_window = Shell::GetInstance()->display_controller()->
133      GetRootWindowForDisplayId(display.id());
134  if (!root_window)
135    return;
136
137  SetContainer(GetRootWindowController(root_window)->GetContainer(
138      kShellWindowId_MouseCursorContainer));
139  SetBoundsInScreen(display.bounds());
140}
141
142void CursorWindowController::UpdateLocation() {
143  if (!cursor_window_)
144    return;
145
146  gfx::Point point = aura::Env::GetInstance()->last_mouse_location();
147  if (!is_cursor_compositing_enabled_) {
148    Shell::GetPrimaryRootWindow()->GetHost()->ConvertPointToHost(&point);
149  } else {
150    point.Offset(-bounds_in_screen_.x(), -bounds_in_screen_.y());
151  }
152  point.Offset(-hot_point_.x(), -hot_point_.y());
153  gfx::Rect bounds = cursor_window_->bounds();
154  bounds.set_origin(point);
155  cursor_window_->SetBounds(bounds);
156}
157
158void CursorWindowController::SetCursor(gfx::NativeCursor cursor) {
159  if (cursor_type_ == cursor.native_type() &&
160      cursor_rotation_ == display_.rotation())
161    return;
162  cursor_type_ = cursor.native_type();
163  cursor_rotation_ = display_.rotation();
164  UpdateCursorImage();
165}
166
167void CursorWindowController::SetCursorSet(ui::CursorSetType cursor_set) {
168  cursor_set_ = cursor_set;
169  UpdateCursorImage();
170}
171
172void CursorWindowController::SetVisibility(bool visible) {
173  if (!cursor_window_)
174    return;
175  if (visible)
176    cursor_window_->Show();
177  else
178    cursor_window_->Hide();
179}
180
181void CursorWindowController::SetContainer(aura::Window* container) {
182  if (container_ == container)
183    return;
184
185  container_ = container;
186  if (!container) {
187    cursor_window_.reset();
188    return;
189  }
190
191  if (!cursor_window_) {
192    cursor_window_.reset(new aura::Window(delegate_.get()));
193    cursor_window_->SetTransparent(true);
194    cursor_window_->Init(aura::WINDOW_LAYER_TEXTURED);
195    cursor_window_->set_ignore_events(true);
196    cursor_window_->set_owned_by_parent(false);
197  }
198
199  container->AddChild(cursor_window_.get());
200  cursor_window_->Show();
201  SetBoundsInScreen(container->bounds());
202}
203
204void CursorWindowController::SetBoundsInScreen(const gfx::Rect& bounds) {
205  bounds_in_screen_ = bounds;
206  UpdateLocation();
207}
208
209void CursorWindowController::UpdateCursorImage() {
210  int resource_id;
211  // TODO(hshi): support custom cursor set.
212  if (!ui::GetCursorDataFor(cursor_set_,
213                            cursor_type_,
214                            display_.device_scale_factor(),
215                            &resource_id,
216                            &hot_point_)) {
217    return;
218  }
219  const gfx::ImageSkia* image =
220      ResourceBundle::GetSharedInstance().GetImageSkiaNamed(resource_id);
221  gfx::ImageSkia rotated = *image;
222  if (!is_cursor_compositing_enabled_) {
223    switch (cursor_rotation_) {
224      case gfx::Display::ROTATE_0:
225        break;
226      case gfx::Display::ROTATE_90:
227        rotated = gfx::ImageSkiaOperations::CreateRotatedImage(
228            *image, SkBitmapOperations::ROTATION_90_CW);
229        hot_point_.SetPoint(
230            rotated.width() - hot_point_.y(),
231            hot_point_.x());
232        break;
233      case gfx::Display::ROTATE_180:
234        rotated = gfx::ImageSkiaOperations::CreateRotatedImage(
235            *image, SkBitmapOperations::ROTATION_180_CW);
236        hot_point_.SetPoint(
237            rotated.height() - hot_point_.x(),
238            rotated.width() - hot_point_.y());
239        break;
240      case gfx::Display::ROTATE_270:
241        rotated = gfx::ImageSkiaOperations::CreateRotatedImage(
242            *image, SkBitmapOperations::ROTATION_270_CW);
243        hot_point_.SetPoint(
244            hot_point_.y(),
245            rotated.height() - hot_point_.x());
246        break;
247    }
248  } else {
249    hot_point_ = ui::ConvertPointToDIP(Shell::GetPrimaryRootWindow()->layer(),
250                                       hot_point_);
251  }
252  delegate_->SetCursorImage(rotated, display_);
253  if (cursor_window_) {
254    cursor_window_->SetBounds(gfx::Rect(delegate_->size()));
255    cursor_window_->SchedulePaintInRect(
256        gfx::Rect(cursor_window_->bounds().size()));
257    UpdateLocation();
258  }
259}
260
261}  // namespace ash
262