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1 // Copyright 2017 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/wm/splitview/split_view_controller.h" | |
6 | |
7 #include "ash/ash_switches.h" | |
8 #include "ash/public/cpp/shell_window_ids.h" | |
9 #include "ash/screen_util.h" | |
10 #include "ash/shell.h" | |
11 #include "ash/wm/maximize_mode/maximize_mode_controller.h" | |
12 #include "ash/wm/mru_window_tracker.h" | |
13 #include "ash/wm/window_state.h" | |
14 #include "ash/wm/window_util.h" | |
15 #include "ash/wm/wm_event.h" | |
16 #include "base/command_line.h" | |
17 #include "ui/aura/window.h" | |
18 #include "ui/wm/core/coordinate_conversion.h" | |
19 #include "ui/wm/public/activation_client.h" | |
20 | |
21 namespace ash { | |
22 | |
23 namespace { | |
24 | |
25 // Returns true if |window| can be activated and snapped. | |
26 bool CanSnap(aura::Window* window) { | |
27 return wm::CanActivateWindow(window) ? wm::GetWindowState(window)->CanSnap() | |
28 : false; | |
29 } | |
30 | |
31 } // namespace | |
32 | |
33 SplitViewController::SplitViewController() { | |
34 Shell::Get()->AddShellObserver(this); | |
35 Shell::Get()->activation_client()->AddObserver(this); | |
36 } | |
37 | |
38 SplitViewController::~SplitViewController() { | |
39 Shell::Get()->RemoveShellObserver(this); | |
40 Shell::Get()->activation_client()->RemoveObserver(this); | |
41 EndSplitView(); | |
42 } | |
43 | |
44 // static | |
45 bool SplitViewController::ShouldAllowSplitView() { | |
46 if (!base::CommandLine::ForCurrentProcess()->HasSwitch( | |
47 switches::kAshEnableTabletSplitView)) { | |
48 return false; | |
49 } | |
50 if (!Shell::Get() | |
51 ->maximize_mode_controller() | |
52 ->IsMaximizeModeWindowManagerEnabled()) { | |
53 return false; | |
54 } | |
55 return true; | |
56 } | |
57 | |
58 bool SplitViewController::IsSplitViewModeActive() const { | |
59 return state_ != NO_SNAP; | |
60 } | |
61 | |
62 void SplitViewController::SetLeftWindow(aura::Window* left_window) { | |
63 DCHECK(left_window); | |
64 | |
65 if (state_ == NO_SNAP) | |
66 Shell::Get()->NotifySplitViewModeStarting(); | |
67 | |
68 if (right_window_ == left_window) { | |
69 StopObserving(right_window_); | |
70 right_window_ = nullptr; | |
71 } | |
72 if (left_window_ != left_window) { | |
73 StopObserving(left_window_); | |
74 left_window_ = left_window; | |
75 left_window_->AddObserver(this); | |
76 wm::GetWindowState(left_window_)->AddObserver(this); | |
77 } | |
78 | |
79 State previous_state = state_; | |
80 switch (state_) { | |
81 case NO_SNAP: | |
82 default_snap_position_ = LEFT; | |
83 state_ = LEFT_SNAPPED; | |
84 break; | |
85 case LEFT_SNAPPED: | |
86 state_ = LEFT_SNAPPED; | |
87 break; | |
88 case RIGHT_SNAPPED: | |
89 case BOTH_SNAPPED: | |
90 state_ = BOTH_SNAPPED; | |
91 break; | |
92 } | |
93 | |
94 const wm::WMEvent event(wm::WM_EVENT_SNAP_LEFT); | |
95 wm::GetWindowState(left_window_)->OnWMEvent(&event); | |
96 wm::ActivateWindow(left_window_); | |
97 | |
98 NotifySplitViewStateChanged(previous_state, state_); | |
99 } | |
100 | |
101 void SplitViewController::SetRightWindow(aura::Window* right_window) { | |
varkha
2017/06/30 14:29:35
nit: Those methods look quite similar, maybe avoid
xdai1
2017/07/05 20:18:22
I merged these two methods into one.
| |
102 DCHECK(right_window); | |
103 | |
104 if (state_ == NO_SNAP) | |
105 Shell::Get()->NotifySplitViewModeStarting(); | |
106 | |
107 if (left_window_ == right_window) { | |
108 StopObserving(left_window_); | |
109 left_window_ = nullptr; | |
110 } | |
111 if (right_window_ != right_window) { | |
112 StopObserving(right_window_); | |
113 right_window_ = right_window; | |
114 right_window_->AddObserver(this); | |
115 wm::GetWindowState(right_window_)->AddObserver(this); | |
116 } | |
117 | |
118 State previous_state = state_; | |
119 switch (state_) { | |
120 case NO_SNAP: | |
121 default_snap_position_ = RIGHT; | |
122 state_ = RIGHT_SNAPPED; | |
123 break; | |
124 case RIGHT_SNAPPED: | |
125 state_ = RIGHT_SNAPPED; | |
126 break; | |
127 case LEFT_SNAPPED: | |
128 case BOTH_SNAPPED: | |
129 state_ = BOTH_SNAPPED; | |
130 break; | |
131 } | |
132 | |
133 const wm::WMEvent event(wm::WM_EVENT_SNAP_RIGHT); | |
134 wm::GetWindowState(right_window_)->OnWMEvent(&event); | |
135 wm::ActivateWindow(right_window_); | |
136 | |
137 NotifySplitViewStateChanged(previous_state, state_); | |
138 } | |
139 | |
140 aura::Window* SplitViewController::GetDefaultSnappedWindow() { | |
141 if (default_snap_position_ == LEFT) | |
142 return left_window_; | |
143 if (default_snap_position_ == RIGHT) | |
144 return right_window_; | |
145 return nullptr; | |
146 } | |
147 | |
148 gfx::Rect SplitViewController::GetSnappedWindowBoundsInParent( | |
149 aura::Window* window, | |
150 State snap_state) { | |
151 if (snap_state == LEFT_SNAPPED) | |
152 return GetLeftWindowBoundsInParent(window); | |
153 else if (snap_state == RIGHT_SNAPPED) | |
154 return GetRightWindowBoundsInParent(window); | |
155 | |
156 NOTREACHED(); | |
157 return gfx::Rect(); | |
158 } | |
159 | |
160 gfx::Rect SplitViewController::GetSnappedWindowBoundsInScreen( | |
161 aura::Window* window, | |
162 State snap_state) { | |
163 if (snap_state == LEFT_SNAPPED) | |
164 return GetLeftWindowBoundsInScreen(window); | |
165 else if (snap_state == RIGHT_SNAPPED) | |
166 return GetRightWindowBoundsInScreen(window); | |
167 | |
168 NOTREACHED(); | |
169 return gfx::Rect(); | |
170 } | |
171 | |
172 gfx::Rect SplitViewController::GetDisplayWorkAreaBoundsInParent( | |
173 aura::Window* window) { | |
174 aura::Window* root_window = window->GetRootWindow(); | |
175 return ScreenUtil::GetDisplayWorkAreaBoundsInParent( | |
176 root_window->GetChildById(kShellWindowId_DefaultContainer)); | |
177 } | |
178 | |
179 gfx::Rect SplitViewController::GetDisplayWorkAreaBoundsInScreen( | |
180 aura::Window* window) { | |
181 gfx::Rect bounds = GetDisplayWorkAreaBoundsInParent(window); | |
182 ::wm::ConvertRectToScreen(window->GetRootWindow(), &bounds); | |
183 return bounds; | |
184 } | |
185 | |
186 void SplitViewController::AddObserver(Observer* observer) { | |
187 observers_.AddObserver(observer); | |
188 } | |
189 | |
190 void SplitViewController::RemoveObserver(Observer* observer) { | |
191 observers_.RemoveObserver(observer); | |
192 } | |
193 | |
194 void SplitViewController::OnWindowDestroying(aura::Window* window) { | |
195 // If one of the snapped window gets closed, end the split view mode. The | |
196 // behavior might change in the future. | |
197 DCHECK(window == left_window_ || window == right_window_); | |
198 EndSplitView(); | |
199 } | |
200 | |
201 void SplitViewController::OnPostWindowStateTypeChange( | |
202 ash::wm::WindowState* window_state, | |
203 ash::wm::WindowStateType old_type) { | |
204 if (window_state->IsFullscreen() || window_state->IsMinimized() || | |
205 window_state->IsMaximized()) { | |
206 // TODO(xdai): Decide what to do if one of the snapped windows gets | |
207 // minimized /maximized / full-screened. For now we end the split view mode | |
208 // for simplicity. | |
209 EndSplitView(); | |
210 } | |
211 } | |
212 | |
213 void SplitViewController::OnWindowActivated(ActivationReason reason, | |
214 aura::Window* gained_active, | |
215 aura::Window* lost_active) { | |
216 if (!IsSplitViewModeActive()) | |
217 return; | |
218 | |
219 // If |gained_active| was activated as a side effect of a window disposition | |
220 // change, do nothing. For example, when a snapped window is closed, another | |
221 // window will be activated before OnWindowDestroying() is called. We should | |
222 // not try to snap another window in this case. | |
223 if (reason == ActivationReason::WINDOW_DISPOSITION_CHANGED) | |
224 return; | |
225 | |
226 // Only snap window that can be snapped but hasn't been snapped. | |
227 if (!gained_active || gained_active == left_window_ || | |
228 gained_active == right_window_ || !CanSnap(gained_active)) { | |
229 return; | |
230 } | |
231 | |
232 // Only window in MRU list can be snapped. | |
233 aura::Window::Windows windows = | |
234 Shell::Get()->mru_window_tracker()->BuildMruWindowList(); | |
235 if (std::find(windows.begin(), windows.end(), gained_active) == windows.end()) | |
236 return; | |
237 | |
238 // Snap the window on the non-default side of the screen if split view mode | |
239 // is active. | |
240 if (default_snap_position_ == LEFT) | |
241 SetRightWindow(gained_active); | |
242 else | |
243 SetLeftWindow(gained_active); | |
244 } | |
245 | |
246 void SplitViewController::OnOverviewModeStarting() { | |
247 // If split view mode is active, reset |state_| to make it be able to select | |
248 // another window from overview window grid. | |
249 if (IsSplitViewModeActive()) { | |
250 State previous_state = state_; | |
251 if (default_snap_position_ == LEFT) { | |
252 StopObserving(right_window_); | |
253 state_ = LEFT_SNAPPED; | |
254 } else { | |
255 StopObserving(left_window_); | |
256 state_ = RIGHT_SNAPPED; | |
257 } | |
258 NotifySplitViewStateChanged(previous_state, state_); | |
259 } | |
260 } | |
261 | |
262 void SplitViewController::OnOverviewModeEnded() { | |
263 // If split view mode is active but only has one snapped window, use the MRU | |
264 // window list to auto select another window to snap. | |
265 if (IsSplitViewModeActive() && state_ != BOTH_SNAPPED) { | |
266 aura::Window::Windows windows = | |
267 Shell::Get()->mru_window_tracker()->BuildMruWindowList(); | |
268 for (auto* window : windows) { | |
269 if (CanSnap(window) && window != GetDefaultSnappedWindow()) { | |
270 if (default_snap_position_ == LEFT) | |
271 SetRightWindow(window); | |
272 else | |
273 SetLeftWindow(window); | |
274 break; | |
275 } | |
276 } | |
277 } | |
278 } | |
279 | |
280 void SplitViewController::EndSplitView() { | |
281 StopObserving(left_window_); | |
282 StopObserving(right_window_); | |
283 left_window_ = nullptr; | |
284 right_window_ = nullptr; | |
285 default_snap_position_ = LEFT; | |
286 divider_position_ = -1; | |
287 | |
288 State previous_state = state_; | |
289 state_ = NO_SNAP; | |
290 NotifySplitViewStateChanged(previous_state, state_); | |
291 | |
292 Shell::Get()->NotifySplitViewModeEnded(); | |
293 } | |
294 | |
295 void SplitViewController::StopObserving(aura::Window* window) { | |
296 if (window) { | |
297 window->RemoveObserver(this); | |
298 if (wm::GetWindowState(window)) | |
299 wm::GetWindowState(window)->RemoveObserver(this); | |
300 } | |
301 } | |
302 | |
303 void SplitViewController::NotifySplitViewStateChanged(State previous_state, | |
304 State state) { | |
305 if (previous_state == state) | |
306 return; | |
307 for (Observer& observer : observers_) | |
308 observer.OnSplitViewStateChanged(previous_state, state); | |
309 } | |
310 | |
311 gfx::Rect SplitViewController::GetLeftWindowBoundsInParent( | |
312 aura::Window* window) { | |
313 gfx::Rect bounds = GetLeftWindowBoundsInScreen(window); | |
314 ::wm::ConvertRectFromScreen(window->GetRootWindow(), &bounds); | |
315 return bounds; | |
316 } | |
317 | |
318 gfx::Rect SplitViewController::GetRightWindowBoundsInParent( | |
319 aura::Window* window) { | |
320 gfx::Rect bounds = GetRightWindowBoundsInScreen(window); | |
321 ::wm::ConvertRectFromScreen(window->GetRootWindow(), &bounds); | |
322 return bounds; | |
323 } | |
324 | |
325 gfx::Rect SplitViewController::GetLeftWindowBoundsInScreen( | |
326 aura::Window* window) { | |
327 const gfx::Rect display_bounds_in_screen = | |
328 GetDisplayWorkAreaBoundsInScreen(window); | |
329 if (divider_position_ < 0) { | |
330 divider_position_ = | |
331 display_bounds_in_screen.x() + display_bounds_in_screen.width() * 0.5f; | |
332 } | |
333 return gfx::Rect(display_bounds_in_screen.x(), display_bounds_in_screen.y(), | |
334 divider_position_ - display_bounds_in_screen.x(), | |
335 display_bounds_in_screen.height()); | |
336 } | |
337 | |
338 gfx::Rect SplitViewController::GetRightWindowBoundsInScreen( | |
339 aura::Window* window) { | |
340 const gfx::Rect display_bounds_in_screen = | |
341 GetDisplayWorkAreaBoundsInScreen(window); | |
342 if (divider_position_ < 0) { | |
343 divider_position_ = | |
344 display_bounds_in_screen.x() + display_bounds_in_screen.width() * 0.5f; | |
345 } | |
346 return gfx::Rect(divider_position_, display_bounds_in_screen.y(), | |
347 display_bounds_in_screen.x() + | |
348 display_bounds_in_screen.width() - divider_position_, | |
349 display_bounds_in_screen.height()); | |
350 } | |
351 | |
352 } // namespace ash | |
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