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Issue 2736573002: chromeos: Move files in //ash/common to //ash, part 2 (Closed)
Patch Set: Created 3 years, 9 months ago
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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/common/wm/window_cycle_controller.h"
6
7 #include "ash/common/metrics/task_switch_source.h"
8 #include "ash/common/session/session_state_delegate.h"
9 #include "ash/common/wm/mru_window_tracker.h"
10 #include "ash/common/wm/window_cycle_event_filter.h"
11 #include "ash/common/wm/window_cycle_list.h"
12 #include "ash/common/wm/window_state.h"
13 #include "ash/common/wm_shell.h"
14 #include "ash/common/wm_window.h"
15 #include "ash/public/cpp/shell_window_ids.h"
16 #include "base/metrics/histogram_macros.h"
17
18 namespace ash {
19
20 namespace {
21
22 // Returns the most recently active window from the |window_list| or nullptr
23 // if the list is empty.
24 WmWindow* GetActiveWindow(const MruWindowTracker::WindowList& window_list) {
25 return window_list.empty() ? nullptr : window_list[0];
26 }
27
28 } // namespace
29
30 //////////////////////////////////////////////////////////////////////////////
31 // WindowCycleController, public:
32
33 WindowCycleController::WindowCycleController() {}
34
35 WindowCycleController::~WindowCycleController() {}
36
37 // static
38 bool WindowCycleController::CanCycle() {
39 // Prevent window cycling if the screen is locked or a modal dialog is open.
40 WmShell* wm_shell = WmShell::Get();
41 return !wm_shell->GetSessionStateDelegate()->IsScreenLocked() &&
42 !wm_shell->IsSystemModalWindowOpen() && !wm_shell->IsPinned();
43 }
44
45 void WindowCycleController::HandleCycleWindow(Direction direction) {
46 if (!CanCycle())
47 return;
48
49 if (!IsCycling())
50 StartCycling();
51
52 Step(direction);
53 }
54
55 void WindowCycleController::StartCycling() {
56 MruWindowTracker::WindowList window_list =
57 WmShell::Get()->mru_window_tracker()->BuildMruWindowList();
58 // Exclude windows:
59 // - non user positionable windows, such as extension popups.
60 // - windows being dragged
61 // - the AppList window, which will hide as soon as cycling starts
62 // anyway. It doesn't make sense to count it as a "switchable" window, yet
63 // a lot of code relies on the MRU list returning the app window. If we
64 // don't manually remove it, the window cycling UI won't crash or misbehave,
65 // but there will be a flicker as the target window changes. Also exclude
66 // unselectable windows such as extension popups.
67 auto window_is_ineligible = [](WmWindow* window) {
68 wm::WindowState* state = window->GetWindowState();
69 return !state->IsUserPositionable() || state->is_dragged() ||
70 window->GetRootWindow()
71 ->GetChildByShellWindowId(kShellWindowId_AppListContainer)
72 ->Contains(window);
73 };
74 window_list.erase(std::remove_if(window_list.begin(), window_list.end(),
75 window_is_ineligible),
76 window_list.end());
77
78 active_window_before_window_cycle_ = GetActiveWindow(window_list);
79
80 window_cycle_list_.reset(new WindowCycleList(window_list));
81 event_filter_ = WmShell::Get()->CreateWindowCycleEventFilter();
82 cycle_start_time_ = base::Time::Now();
83 WmShell::Get()->RecordUserMetricsAction(UMA_WINDOW_CYCLE);
84 UMA_HISTOGRAM_COUNTS_100("Ash.WindowCycleController.Items",
85 window_list.size());
86 }
87
88 void WindowCycleController::CompleteCycling() {
89 window_cycle_list_->set_user_did_accept(true);
90 StopCycling();
91 }
92
93 void WindowCycleController::CancelCycling() {
94 StopCycling();
95 }
96
97 //////////////////////////////////////////////////////////////////////////////
98 // WindowCycleController, private:
99
100 void WindowCycleController::Step(Direction direction) {
101 DCHECK(window_cycle_list_.get());
102 window_cycle_list_->Step(direction);
103 }
104
105 void WindowCycleController::StopCycling() {
106 UMA_HISTOGRAM_COUNTS_100("Ash.WindowCycleController.SelectionDepth",
107 window_cycle_list_->current_index() + 1);
108 window_cycle_list_.reset();
109
110 WmWindow* active_window_after_window_cycle = GetActiveWindow(
111 WmShell::Get()->mru_window_tracker()->BuildMruWindowList());
112
113 // Remove our key event filter.
114 event_filter_.reset();
115 UMA_HISTOGRAM_MEDIUM_TIMES("Ash.WindowCycleController.CycleTime",
116 base::Time::Now() - cycle_start_time_);
117
118 if (active_window_after_window_cycle != nullptr &&
119 active_window_before_window_cycle_ != active_window_after_window_cycle) {
120 WmShell::Get()->RecordTaskSwitchMetric(
121 TaskSwitchSource::WINDOW_CYCLE_CONTROLLER);
122 }
123 active_window_before_window_cycle_ = nullptr;
124 }
125
126 } // namespace ash
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