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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/shell.h"
#include "ash/shell_delegate.h"
#include "ash/shell_window_ids.h"
#include "ash/wm/window_cycle_list.h"
#include "ash/wm/window_util.h"
#include "ui/aura/event.h"
#include "ui/aura/event_filter.h"
#include "ui/aura/root_window.h"
namespace ash {
namespace {
// Filter to watch for the termination of a keyboard gesture to cycle through
// multiple windows.
class WindowCycleEventFilter : public aura::EventFilter {
public:
WindowCycleEventFilter();
virtual ~WindowCycleEventFilter();
// Overridden from aura::EventFilter:
virtual bool PreHandleKeyEvent(aura::Window* target,
aura::KeyEvent* event) OVERRIDE;
virtual bool PreHandleMouseEvent(aura::Window* target,
aura::MouseEvent* event) OVERRIDE;
virtual ui::TouchStatus PreHandleTouchEvent(aura::Window* target,
aura::TouchEvent* event) OVERRIDE;
virtual ui::GestureStatus PreHandleGestureEvent(
aura::Window* target,
aura::GestureEvent* event) OVERRIDE;
private:
DISALLOW_COPY_AND_ASSIGN(WindowCycleEventFilter);
};
// Watch for all keyboard events by filtering the root window.
WindowCycleEventFilter::WindowCycleEventFilter() {
}
WindowCycleEventFilter::~WindowCycleEventFilter() {
}
bool WindowCycleEventFilter::PreHandleKeyEvent(
aura::Window* target,
aura::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.
}
return false; // Always let the event propagate.
}
bool WindowCycleEventFilter::PreHandleMouseEvent(
aura::Window* target,
aura::MouseEvent* event) {
return false; // Not handled.
}
ui::TouchStatus WindowCycleEventFilter::PreHandleTouchEvent(
aura::Window* target,
aura::TouchEvent* event) {
return ui::TOUCH_STATUS_UNKNOWN; // Not handled.
}
ui::GestureStatus WindowCycleEventFilter::PreHandleGestureEvent(
aura::Window* target,
aura::GestureEvent* event) {
return ui::GESTURE_STATUS_UNKNOWN; // Not handled.
}
} // 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()->IsScreenLocked() &&
!Shell::GetInstance()->IsModalWindowOpen();
}
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::AltKeyReleased() {
StopCycling();
}
// static
std::vector<aura::Window*> WindowCycleController::BuildWindowList() {
// TODO(oshima): Figure out how this should work with multiple root
// windows. Just use active root window for now.
aura::Window* default_container = Shell::GetContainer(
Shell::GetActiveRootWindow(),
internal::kShellWindowId_DefaultContainer);
WindowCycleList::WindowList windows = default_container->children();
// Removes unfocusable windows.
WindowCycleList::WindowList::iterator last =
std::remove_if(
windows.begin(),
windows.end(),
std::not1(std::ptr_fun(ash::wm::CanActivateWindow)));
windows.erase(last, windows.end());
// Window cycling expects the topmost window at the front of the list.
std::reverse(windows.begin(), windows.end());
return windows;
}
//////////////////////////////////////////////////////////////////////////////
// WindowCycleController, private:
void WindowCycleController::StartCycling() {
windows_.reset(new WindowCycleList(BuildWindowList()));
}
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_filter_.get()) {
Shell::GetInstance()->RemoveEnvEventFilter(event_filter_.get());
event_filter_.reset();
}
}
void WindowCycleController::InstallEventFilter() {
event_filter_.reset(new WindowCycleEventFilter());
Shell::GetInstance()->AddEnvEventFilter(event_filter_.get());
}
} // namespace ash
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