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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "ash/wm/window_cycle_controller.h"
#include <algorithm>
#include "ash/session_state_delegate.h"
#include "ash/shell.h"
#include "ash/shell_window_ids.h"
#include "ash/wm/mru_window_tracker.h"
#include "ash/wm/window_cycle_list.h"
#include "ash/wm/window_util.h"
#include "ash/wm/workspace_controller.h"
#include "ui/aura/root_window.h"
#include "ui/events/event.h"
#include "ui/events/event_handler.h"
namespace ash {
namespace {
// Filter to watch for the termination of a keyboard gesture to cycle through
// multiple windows.
class WindowCycleEventFilter : public ui::EventHandler {
public:
WindowCycleEventFilter();
virtual ~WindowCycleEventFilter();
// Overridden from ui::EventHandler:
virtual void OnKeyEvent(ui::KeyEvent* event) OVERRIDE;
private:
DISALLOW_COPY_AND_ASSIGN(WindowCycleEventFilter);
};
// Watch for all keyboard events by filtering the root window.
WindowCycleEventFilter::WindowCycleEventFilter() {
}
WindowCycleEventFilter::~WindowCycleEventFilter() {
}
void WindowCycleEventFilter::OnKeyEvent(ui::KeyEvent* event) {
// Views uses VKEY_MENU for both left and right Alt keys.
if (event->key_code() == ui::VKEY_MENU &&
event->type() == ui::ET_KEY_RELEASED) {
Shell::GetInstance()->window_cycle_controller()->AltKeyReleased();
// Warning: |this| will be deleted from here on.
}
}
} // namespace
//////////////////////////////////////////////////////////////////////////////
// WindowCycleController, public:
WindowCycleController::WindowCycleController() {
}
WindowCycleController::~WindowCycleController() {
StopCycling();
}
// static
bool WindowCycleController::CanCycle() {
// Don't allow window cycling if the screen is locked or a modal dialog is
// open.
return !Shell::GetInstance()->session_state_delegate()->IsScreenLocked() &&
!Shell::GetInstance()->IsSystemModalWindowOpen();
}
void WindowCycleController::HandleCycleWindow(Direction direction,
bool is_alt_down) {
if (!CanCycle())
return;
if (is_alt_down) {
if (!IsCycling()) {
// This is the start of an alt-tab cycle through multiple windows, so
// listen for the alt key being released to stop cycling.
StartCycling();
Step(direction);
InstallEventFilter();
} else {
// We're in the middle of an alt-tab cycle, just step forward.
Step(direction);
}
} else {
// This is a simple, single-step window cycle.
StartCycling();
Step(direction);
StopCycling();
}
}
void WindowCycleController::HandleLinearCycleWindow() {
if (!CanCycle() || IsCycling())
return;
// Use the reversed list of windows to prevent a 2-cycle of the most recent
// windows occurring.
WindowCycleList cycle_list(MruWindowTracker::BuildWindowList(true));
cycle_list.Step(WindowCycleList::FORWARD);
}
void WindowCycleController::AltKeyReleased() {
StopCycling();
}
//////////////////////////////////////////////////////////////////////////////
// WindowCycleController, private:
void WindowCycleController::StartCycling() {
windows_.reset(new WindowCycleList(ash::Shell::GetInstance()->
mru_window_tracker()->BuildMruWindowList()));
}
void WindowCycleController::Step(Direction direction) {
DCHECK(windows_.get());
windows_->Step(direction == FORWARD ? WindowCycleList::FORWARD :
WindowCycleList::BACKWARD);
}
void WindowCycleController::StopCycling() {
windows_.reset();
// Remove our key event filter.
if (event_handler_) {
Shell::GetInstance()->RemovePreTargetHandler(event_handler_.get());
event_handler_.reset();
}
}
void WindowCycleController::InstallEventFilter() {
event_handler_.reset(new WindowCycleEventFilter());
Shell::GetInstance()->AddPreTargetHandler(event_handler_.get());
}
} // namespace ash
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