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| 1 // Copyright (c) 2012 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/window_cycle_controller.h" | |
| 6 | |
| 7 #include <algorithm> | |
| 8 | |
| 9 #include "ash/session_state_delegate.h" | |
| 10 #include "ash/shell.h" | |
| 11 #include "ash/shell_window_ids.h" | |
| 12 #include "ash/wm/mru_window_tracker.h" | |
| 13 #include "ash/wm/window_cycle_list.h" | |
| 14 #include "ash/wm/window_util.h" | |
| 15 #include "ash/wm/workspace_controller.h" | |
| 16 #include "ui/aura/window_event_dispatcher.h" | |
| 17 #include "ui/events/event.h" | |
| 18 #include "ui/events/event_handler.h" | |
| 19 | |
| 20 namespace ash { | |
| 21 | |
| 22 namespace { | |
| 23 | |
| 24 // Filter to watch for the termination of a keyboard gesture to cycle through | |
| 25 // multiple windows. | |
| 26 class WindowCycleEventFilter : public ui::EventHandler { | |
| 27 public: | |
| 28 WindowCycleEventFilter(); | |
| 29 virtual ~WindowCycleEventFilter(); | |
| 30 | |
| 31 // Overridden from ui::EventHandler: | |
| 32 virtual void OnKeyEvent(ui::KeyEvent* event) OVERRIDE; | |
| 33 private: | |
| 34 DISALLOW_COPY_AND_ASSIGN(WindowCycleEventFilter); | |
| 35 }; | |
| 36 | |
| 37 // Watch for all keyboard events by filtering the root window. | |
| 38 WindowCycleEventFilter::WindowCycleEventFilter() { | |
| 39 } | |
| 40 | |
| 41 WindowCycleEventFilter::~WindowCycleEventFilter() { | |
| 42 } | |
| 43 | |
| 44 void WindowCycleEventFilter::OnKeyEvent(ui::KeyEvent* event) { | |
| 45 // Views uses VKEY_MENU for both left and right Alt keys. | |
| 46 if (event->key_code() == ui::VKEY_MENU && | |
| 47 event->type() == ui::ET_KEY_RELEASED) { | |
| 48 Shell::GetInstance()->window_cycle_controller()->AltKeyReleased(); | |
| 49 // Warning: |this| will be deleted from here on. | |
| 50 } | |
| 51 } | |
| 52 | |
| 53 } // namespace | |
| 54 | |
| 55 ////////////////////////////////////////////////////////////////////////////// | |
| 56 // WindowCycleController, public: | |
| 57 | |
| 58 WindowCycleController::WindowCycleController() { | |
| 59 } | |
| 60 | |
| 61 WindowCycleController::~WindowCycleController() { | |
| 62 StopCycling(); | |
| 63 } | |
| 64 | |
| 65 // static | |
| 66 bool WindowCycleController::CanCycle() { | |
| 67 // Don't allow window cycling if the screen is locked or a modal dialog is | |
| 68 // open. | |
| 69 return !Shell::GetInstance()->session_state_delegate()->IsScreenLocked() && | |
| 70 !Shell::GetInstance()->IsSystemModalWindowOpen(); | |
| 71 } | |
| 72 | |
| 73 void WindowCycleController::HandleCycleWindow(Direction direction, | |
| 74 bool is_alt_down) { | |
| 75 if (!CanCycle()) | |
| 76 return; | |
| 77 | |
| 78 if (is_alt_down) { | |
| 79 if (!IsCycling()) { | |
| 80 // This is the start of an alt-tab cycle through multiple windows, so | |
| 81 // listen for the alt key being released to stop cycling. | |
| 82 StartCycling(); | |
| 83 Step(direction); | |
| 84 InstallEventFilter(); | |
| 85 } else { | |
| 86 // We're in the middle of an alt-tab cycle, just step forward. | |
| 87 Step(direction); | |
| 88 } | |
| 89 } else { | |
| 90 // This is a simple, single-step window cycle. | |
| 91 StartCycling(); | |
| 92 Step(direction); | |
| 93 StopCycling(); | |
| 94 } | |
| 95 } | |
| 96 | |
| 97 void WindowCycleController::HandleLinearCycleWindow() { | |
| 98 if (!CanCycle() || IsCycling()) | |
| 99 return; | |
| 100 | |
| 101 // Use the reversed list of windows to prevent a 2-cycle of the most recent | |
| 102 // windows occurring. | |
| 103 WindowCycleList cycle_list(MruWindowTracker::BuildWindowList(true)); | |
| 104 cycle_list.Step(WindowCycleList::FORWARD); | |
| 105 } | |
| 106 | |
| 107 void WindowCycleController::AltKeyReleased() { | |
| 108 StopCycling(); | |
| 109 } | |
| 110 | |
| 111 ////////////////////////////////////////////////////////////////////////////// | |
| 112 // WindowCycleController, private: | |
| 113 | |
| 114 void WindowCycleController::StartCycling() { | |
| 115 windows_.reset(new WindowCycleList(ash::Shell::GetInstance()-> | |
| 116 mru_window_tracker()->BuildMruWindowList())); | |
| 117 } | |
| 118 | |
| 119 void WindowCycleController::Step(Direction direction) { | |
| 120 DCHECK(windows_.get()); | |
| 121 windows_->Step(direction == FORWARD ? WindowCycleList::FORWARD : | |
| 122 WindowCycleList::BACKWARD); | |
| 123 } | |
| 124 | |
| 125 void WindowCycleController::StopCycling() { | |
| 126 windows_.reset(); | |
| 127 // Remove our key event filter. | |
| 128 if (event_handler_) { | |
| 129 Shell::GetInstance()->RemovePreTargetHandler(event_handler_.get()); | |
| 130 event_handler_.reset(); | |
| 131 } | |
| 132 } | |
| 133 | |
| 134 void WindowCycleController::InstallEventFilter() { | |
| 135 event_handler_.reset(new WindowCycleEventFilter()); | |
| 136 Shell::GetInstance()->AddPreTargetHandler(event_handler_.get()); | |
| 137 } | |
| 138 | |
| 139 } // namespace ash | |
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Chromium Code Reviews
Issue 181563004:
Remove --ash-disable-overview-mode (Closed)
Base URL: svn://svn.chromium.org/chrome/trunk/src