screen_ash.cc revision 0529e5d033099cbfc42635f6f6183833b09dff6e 
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/screen_ash.h"
6
7#include "ash/display/display_controller.h"
8#include "ash/display/display_manager.h"
9#include "ash/root_window_controller.h"
10#include "ash/root_window_settings.h"
11#include "ash/shelf/shelf_layout_manager.h"
12#include "ash/shelf/shelf_widget.h"
13#include "ash/shell.h"
14#include "ash/wm/coordinate_conversion.h"
15#include "base/logging.h"
16#include "ui/aura/client/screen_position_client.h"
17#include "ui/aura/env.h"
18#include "ui/aura/window_event_dispatcher.h"
19#include "ui/gfx/display.h"
20#include "ui/gfx/screen.h"
21
22namespace ash {
23
24namespace {
25
26DisplayManager* GetDisplayManager() {
27  return Shell::GetInstance()->display_manager();
28}
29
30gfx::Display FindDisplayNearestPoint(const std::vector<gfx::Display>& displays,
31                                     const gfx::Point& point) {
32  int min_distance = INT_MAX;
33  const gfx::Display* nearest_display = NULL;
34  for (std::vector<gfx::Display>::const_iterator iter = displays.begin();
35       iter != displays.end(); ++iter) {
36    const gfx::Display& display = *iter;
37    int distance = display.bounds().ManhattanDistanceToPoint(point);
38    if (distance < min_distance) {
39      min_distance = distance;
40      nearest_display = &display;
41    }
42  }
43  // There should always be at least one display that is less than INT_MAX away.
44  DCHECK(nearest_display);
45  return *nearest_display;
46}
47
48const gfx::Display* FindDisplayMatching(
49    const std::vector<gfx::Display>& displays,
50    const gfx::Rect& match_rect) {
51  int max_area = 0;
52  const gfx::Display* matching = NULL;
53  for (std::vector<gfx::Display>::const_iterator iter = displays.begin();
54       iter != displays.end(); ++iter) {
55    const gfx::Display& display = *iter;
56    gfx::Rect intersect = gfx::IntersectRects(display.bounds(), match_rect);
57    int area = intersect.width() * intersect.height();
58    if (area > max_area) {
59      max_area = area;
60      matching = &display;
61    }
62  }
63  return matching;
64}
65
66class ScreenForShutdown : public gfx::Screen {
67 public:
68  explicit ScreenForShutdown(ScreenAsh* screen_ash)
69      : display_list_(screen_ash->GetAllDisplays()),
70        primary_display_(screen_ash->GetPrimaryDisplay()) {
71  }
72
73  // gfx::Screen overrides:
74  virtual bool IsDIPEnabled() OVERRIDE {
75    return true;
76  }
77  virtual gfx::Point GetCursorScreenPoint() OVERRIDE {
78    return gfx::Point();
79  }
80  virtual gfx::NativeWindow GetWindowUnderCursor() OVERRIDE {
81    return NULL;
82  }
83  virtual gfx::NativeWindow GetWindowAtScreenPoint(
84      const gfx::Point& point) OVERRIDE {
85    return NULL;
86  }
87  virtual int GetNumDisplays() const OVERRIDE {
88    return display_list_.size();
89  }
90  virtual std::vector<gfx::Display> GetAllDisplays() const OVERRIDE {
91    return display_list_;
92  }
93  virtual gfx::Display GetDisplayNearestWindow(gfx::NativeView view)
94      const OVERRIDE {
95    return primary_display_;
96  }
97  virtual gfx::Display GetDisplayNearestPoint(
98      const gfx::Point& point) const OVERRIDE {
99    return FindDisplayNearestPoint(display_list_, point);
100  }
101  virtual gfx::Display GetDisplayMatching(const gfx::Rect& match_rect)
102      const OVERRIDE {
103    const gfx::Display* matching =
104        FindDisplayMatching(display_list_, match_rect);
105    // Fallback to the primary display if there is no matching display.
106    return matching ? *matching : GetPrimaryDisplay();
107  }
108  virtual gfx::Display GetPrimaryDisplay() const OVERRIDE {
109    return primary_display_;
110  }
111  virtual void AddObserver(gfx::DisplayObserver* observer) OVERRIDE {
112    NOTREACHED() << "Observer should not be added during shutdown";
113  }
114  virtual void RemoveObserver(gfx::DisplayObserver* observer) OVERRIDE {
115  }
116
117 private:
118  const std::vector<gfx::Display> display_list_;
119  const gfx::Display primary_display_;
120
121  DISALLOW_COPY_AND_ASSIGN(ScreenForShutdown);
122};
123
124}  // namespace
125
126ScreenAsh::ScreenAsh() {
127}
128
129ScreenAsh::~ScreenAsh() {
130}
131
132// static
133gfx::Display ScreenAsh::FindDisplayContainingPoint(const gfx::Point& point) {
134  return GetDisplayManager()->FindDisplayContainingPoint(point);
135}
136
137// static
138gfx::Rect ScreenAsh::GetMaximizedWindowBoundsInParent(aura::Window* window) {
139  if (GetRootWindowController(window->GetRootWindow())->shelf())
140    return GetDisplayWorkAreaBoundsInParent(window);
141  else
142    return GetDisplayBoundsInParent(window);
143}
144
145// static
146gfx::Rect ScreenAsh::GetDisplayBoundsInParent(aura::Window* window) {
147  return ConvertRectFromScreen(
148      window->parent(),
149      Shell::GetScreen()->GetDisplayNearestWindow(window).bounds());
150}
151
152// static
153gfx::Rect ScreenAsh::GetDisplayWorkAreaBoundsInParent(aura::Window* window) {
154  return ConvertRectFromScreen(
155      window->parent(),
156      Shell::GetScreen()->GetDisplayNearestWindow(window).work_area());
157}
158
159// static
160gfx::Rect ScreenAsh::ConvertRectToScreen(aura::Window* window,
161                                         const gfx::Rect& rect) {
162  gfx::Point point = rect.origin();
163  aura::client::GetScreenPositionClient(window->GetRootWindow())->
164      ConvertPointToScreen(window, &point);
165  return gfx::Rect(point, rect.size());
166}
167
168// static
169gfx::Rect ScreenAsh::ConvertRectFromScreen(aura::Window* window,
170                                           const gfx::Rect& rect) {
171  gfx::Point point = rect.origin();
172  aura::client::GetScreenPositionClient(window->GetRootWindow())->
173      ConvertPointFromScreen(window, &point);
174  return gfx::Rect(point, rect.size());
175}
176
177// static
178const gfx::Display& ScreenAsh::GetSecondaryDisplay() {
179  DisplayManager* display_manager = GetDisplayManager();
180  CHECK_EQ(2U, display_manager->GetNumDisplays());
181  return display_manager->GetDisplayAt(0).id() ==
182      Shell::GetScreen()->GetPrimaryDisplay().id() ?
183      display_manager->GetDisplayAt(1) : display_manager->GetDisplayAt(0);
184}
185
186// static
187const gfx::Display& ScreenAsh::GetDisplayForId(int64 display_id) {
188  return GetDisplayManager()->GetDisplayForId(display_id);
189}
190
191void ScreenAsh::NotifyBoundsChanged(const gfx::Display& display) {
192  FOR_EACH_OBSERVER(gfx::DisplayObserver, observers_,
193                    OnDisplayBoundsChanged(display));
194}
195
196void ScreenAsh::NotifyDisplayAdded(const gfx::Display& display) {
197  FOR_EACH_OBSERVER(gfx::DisplayObserver, observers_, OnDisplayAdded(display));
198}
199
200void ScreenAsh::NotifyDisplayRemoved(const gfx::Display& display) {
201  FOR_EACH_OBSERVER(
202      gfx::DisplayObserver, observers_, OnDisplayRemoved(display));
203}
204
205bool ScreenAsh::IsDIPEnabled() {
206  return true;
207}
208
209gfx::Point ScreenAsh::GetCursorScreenPoint() {
210  return aura::Env::GetInstance()->last_mouse_location();
211}
212
213gfx::NativeWindow ScreenAsh::GetWindowUnderCursor() {
214  return GetWindowAtScreenPoint(Shell::GetScreen()->GetCursorScreenPoint());
215}
216
217gfx::NativeWindow ScreenAsh::GetWindowAtScreenPoint(const gfx::Point& point) {
218  return wm::GetRootWindowAt(point)->GetTopWindowContainingPoint(point);
219}
220
221int ScreenAsh::GetNumDisplays() const {
222  return GetDisplayManager()->GetNumDisplays();
223}
224
225std::vector<gfx::Display> ScreenAsh::GetAllDisplays() const {
226  return GetDisplayManager()->displays();
227}
228
229gfx::Display ScreenAsh::GetDisplayNearestWindow(gfx::NativeView window) const {
230  if (!window)
231    return GetPrimaryDisplay();
232  const aura::Window* root_window = window->GetRootWindow();
233  if (!root_window)
234    return GetPrimaryDisplay();
235  const RootWindowSettings* rws = GetRootWindowSettings(root_window);
236  if (rws->shutdown)
237    return GetPrimaryDisplay();
238
239  int64 id = rws->display_id;
240  // if id is |kInvaildDisplayID|, it's being deleted.
241  DCHECK(id != gfx::Display::kInvalidDisplayID);
242
243  DisplayManager* display_manager = GetDisplayManager();
244  // RootWindow needs Display to determine its device scale factor
245  // for non desktop display.
246  if (display_manager->non_desktop_display().id() == id)
247    return display_manager->non_desktop_display();
248  return display_manager->GetDisplayForId(id);
249}
250
251gfx::Display ScreenAsh::GetDisplayNearestPoint(const gfx::Point& point) const {
252  const gfx::Display& display =
253      GetDisplayManager()->FindDisplayContainingPoint(point);
254  if (display.is_valid())
255    return display;
256  // Fallback to the display that has the shortest Manhattan distance from
257  // the |point|. This is correct in the only areas that matter, namely in the
258  // corners between the physical screens.
259  return FindDisplayNearestPoint(GetDisplayManager()->displays(), point);
260}
261
262gfx::Display ScreenAsh::GetDisplayMatching(const gfx::Rect& match_rect) const {
263  if (match_rect.IsEmpty())
264    return GetDisplayNearestPoint(match_rect.origin());
265  const gfx::Display* matching =
266      FindDisplayMatching(GetDisplayManager()->displays(), match_rect);
267  // Fallback to the primary display if there is no matching display.
268  return matching ? *matching : GetPrimaryDisplay();
269}
270
271gfx::Display ScreenAsh::GetPrimaryDisplay() const {
272  return GetDisplayManager()->GetDisplayForId(
273      DisplayController::GetPrimaryDisplayId());
274}
275
276void ScreenAsh::AddObserver(gfx::DisplayObserver* observer) {
277  observers_.AddObserver(observer);
278}
279
280void ScreenAsh::RemoveObserver(gfx::DisplayObserver* observer) {
281  observers_.RemoveObserver(observer);
282}
283
284gfx::Screen* ScreenAsh::CloneForShutdown() {
285  return new ScreenForShutdown(this);
286}
287
288}  // namespace ash
289