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- // Copyright 2014 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/pre_target_accelerator_handler.h"
- #include "ash/accelerators/accelerator_controller_impl.h"
- #include "ash/shell.h"
- #include "ash/wm/window_state.h"
- #include "base/containers/contains.h"
- #include "base/feature_list.h"
- #include "media/base/media_switches.h"
- #include "ui/aura/window.h"
- #include "ui/base/accelerators/accelerator.h"
- #include "ui/events/event.h"
- #include "ui/wm/core/window_util.h"
- namespace ash {
- namespace {
- // Returns true if |key_code| is a key usually handled directly by the shell.
- bool IsSystemKey(ui::KeyboardCode key_code) {
- switch (key_code) {
- case ui::VKEY_ASSISTANT:
- case ui::VKEY_ZOOM: // 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:
- case ui::VKEY_POWER:
- case ui::VKEY_SLEEP:
- case ui::VKEY_PRIVACY_SCREEN_TOGGLE:
- case ui::VKEY_SETTINGS:
- return true;
- case ui::VKEY_MEDIA_NEXT_TRACK:
- case ui::VKEY_MEDIA_PAUSE:
- case ui::VKEY_MEDIA_PLAY:
- case ui::VKEY_MEDIA_PLAY_PAUSE:
- case ui::VKEY_MEDIA_PREV_TRACK:
- case ui::VKEY_MEDIA_STOP:
- case ui::VKEY_OEM_103: // KEYCODE_MEDIA_REWIND
- case ui::VKEY_OEM_104: // KEYCODE_MEDIA_FAST_FORWARD
- return base::FeatureList::IsEnabled(media::kHardwareMediaKeyHandling);
- default:
- return false;
- }
- }
- } // namespace
- PreTargetAcceleratorHandler::PreTargetAcceleratorHandler() = default;
- PreTargetAcceleratorHandler::~PreTargetAcceleratorHandler() = default;
- bool PreTargetAcceleratorHandler::ProcessAccelerator(
- const ui::KeyEvent& key_event,
- const ui::Accelerator& accelerator) {
- aura::Window* target = static_cast<aura::Window*>(key_event.target());
- // Callers should never supply null.
- DCHECK(target);
- // Special hardware keys like brightness and volume are handled in
- // special way. 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(key_event.key_code()) &&
- !CanConsumeSystemKeys(target, key_event)) {
- // System keys are always consumed regardless of whether they trigger an
- // accelerator to prevent windows from seeing unexpected key up events.
- Shell::Get()->accelerator_controller()->Process(accelerator);
- return true;
- }
- if (!ShouldProcessAcceleratorNow(target, key_event, accelerator))
- return false;
- return Shell::Get()->accelerator_controller()->Process(accelerator);
- }
- bool PreTargetAcceleratorHandler::CanConsumeSystemKeys(
- aura::Window* target,
- const ui::KeyEvent& event) {
- // Uses the top level window so if the target is a web contents window the
- // containing parent window will be checked for the property.
- aura::Window* top_level = ::wm::GetToplevelWindow(target);
- return top_level && WindowState::Get(top_level)->CanConsumeSystemKeys();
- }
- bool PreTargetAcceleratorHandler::ShouldProcessAcceleratorNow(
- aura::Window* target,
- const ui::KeyEvent& event,
- const ui::Accelerator& accelerator) {
- // Callers should never supply null.
- DCHECK(target);
- // On ChromeOS, If the accelerator is Search+<key(s)> then it must never be
- // intercepted by apps or windows.
- if (accelerator.IsCmdDown())
- return true;
- if (base::Contains(Shell::GetAllRootWindows(), target))
- return true;
- AcceleratorControllerImpl* accelerator_controller =
- Shell::Get()->accelerator_controller();
- // Reserved accelerators (such as Power button) always have a priority.
- if (accelerator_controller->IsReserved(accelerator))
- return true;
- // A full screen window has a right to handle all key events including the
- // reserved ones.
- aura::Window* top_level = ::wm::GetToplevelWindow(target);
- if (top_level && WindowState::Get(top_level)->IsFullscreen()) {
- // On ChromeOS, fullscreen windows are either browser or apps, which
- // send key events to a web content first, then will process keys
- // if the web content didn't consume them.
- return false;
- }
- // Handle preferred accelerators (such as ALT-TAB) before sending
- // to the target.
- return accelerator_controller->IsPreferred(accelerator);
- }
- } // namespace ash
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