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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/accelerators/accelerator_filter.h"
#include "ash/accelerators/accelerator_controller.h"
#include "ash/shell.h"
#include "ash/wm/window_state.h"
#include "ui/aura/root_window.h"
#include "ui/base/accelerators/accelerator.h"
#include "ui/base/accelerators/accelerator_manager.h"
#include "ui/events/event.h"
#include "ui/views/corewm/window_util.h"
namespace ash {
namespace {
const int kModifierFlagMask = (ui::EF_SHIFT_DOWN |
ui::EF_CONTROL_DOWN |
ui::EF_ALT_DOWN);
// Returns true if |key_code| is a key usually handled directly by the shell.
bool IsSystemKey(ui::KeyboardCode key_code) {
#if defined(OS_CHROMEOS)
switch (key_code) {
case ui::VKEY_MEDIA_LAUNCH_APP2: // Fullscreen button.
case ui::VKEY_MEDIA_LAUNCH_APP1: // Overview button.
case ui::VKEY_BRIGHTNESS_DOWN:
case ui::VKEY_BRIGHTNESS_UP:
case ui::VKEY_KBD_BRIGHTNESS_DOWN:
case ui::VKEY_KBD_BRIGHTNESS_UP:
case ui::VKEY_VOLUME_MUTE:
case ui::VKEY_VOLUME_DOWN:
case ui::VKEY_VOLUME_UP:
return true;
default:
return false;
}
#endif // defined(OS_CHROMEOS)
return false;
}
// Returns true if the window should be allowed a chance to handle system keys.
// Uses the top level window so if the target is a web contents window the
// containing parent window will be checked for the property.
bool CanConsumeSystemKeys(aura::Window* target) {
if (!target) // Can be NULL in tests.
return false;
aura::Window* top_level = views::corewm::GetToplevelWindow(target);
return top_level && wm::GetWindowState(top_level)->can_consume_system_keys();
}
// Returns true if the |accelerator| should be processed now, inside Ash's env
// event filter.
bool ShouldProcessAcceleratorsNow(const ui::Accelerator& accelerator,
aura::Window* target) {
if (!target)
return true;
aura::Window::Windows root_windows = Shell::GetAllRootWindows();
if (std::find(root_windows.begin(), root_windows.end(), target) !=
root_windows.end())
return true;
// A full screen window should be able to handle all key events including the
// reserved ones.
if (wm::GetWindowState(target)->IsFullscreen()) {
// TODO(yusukes): On Chrome OS, only browser and flash windows can be full
// screen. Launching an app in "open full-screen" mode is not supported yet.
// That makes the IsWindowFullscreen() check above almost meaningless
// because a browser and flash window do handle Ash accelerators anyway
// before they're passed to a page or flash content.
return false;
}
if (Shell::GetInstance()->GetAppListTargetVisibility())
return true;
// Unless |target| is in the full screen state, handle reserved accelerators
// such as Alt+Tab now.
return Shell::GetInstance()->accelerator_controller()->IsReservedAccelerator(
accelerator);
}
} // namespace
namespace internal {
////////////////////////////////////////////////////////////////////////////////
// AcceleratorFilter, public:
AcceleratorFilter::AcceleratorFilter() {
}
AcceleratorFilter::~AcceleratorFilter() {
}
////////////////////////////////////////////////////////////////////////////////
// AcceleratorFilter, EventFilter implementation:
void AcceleratorFilter::OnKeyEvent(ui::KeyEvent* event) {
const ui::EventType type = event->type();
if (type != ui::ET_KEY_PRESSED && type != ui::ET_KEY_RELEASED)
return;
if (event->is_char())
return;
ui::Accelerator accelerator(event->key_code(),
event->flags() & kModifierFlagMask);
accelerator.set_type(type);
// Fill out context object so AcceleratorController will know what
// was the previous accelerator or if the current accelerator is repeated.
AcceleratorController* accelerator_controller =
Shell::GetInstance()->accelerator_controller();
accelerator_controller->context()->UpdateContext(accelerator);
aura::Window* target = static_cast<aura::Window*>(event->target());
// Handle special hardware keys like brightness and volume. However, some
// windows can override this behavior (e.g. Chrome v1 apps by default and
// Chrome v2 apps with permission) by setting a window property.
if (IsSystemKey(event->key_code()) && !CanConsumeSystemKeys(target)) {
accelerator_controller->Process(accelerator);
// These keys are always consumed regardless of whether they trigger an
// accelerator to prevent windows from seeing unexpected key up events.
event->StopPropagation();
return;
}
if (!ShouldProcessAcceleratorsNow(accelerator, target))
return;
if (accelerator_controller->Process(accelerator))
event->StopPropagation();
}
} // namespace internal
} // namespace ash
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