1// Copyright 2014 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/accelerators/accelerator_delegate.h"
6
7#include "ash/accelerators/accelerator_controller.h"
8#include "ash/shell.h"
9#include "ash/wm/window_state.h"
10#include "ui/base/accelerators/accelerator.h"
11#include "ui/events/event.h"
12#include "ui/wm/core/window_util.h"
13
14namespace ash {
15namespace {}  // namespace
16
17AcceleratorDelegate::AcceleratorDelegate() {
18}
19AcceleratorDelegate::~AcceleratorDelegate() {
20}
21
22bool AcceleratorDelegate::ProcessAccelerator(const ui::KeyEvent& key_event,
23                                             const ui::Accelerator& accelerator,
24                                             KeyType key_type) {
25  // Special hardware keys like brightness and volume are handled in
26  // special way. However, some windows can override this behavior
27  // (e.g. Chrome v1 apps by default and Chrome v2 apps with
28  // permission) by setting a window property.
29  if (key_type == KEY_TYPE_SYSTEM && !CanConsumeSystemKeys(key_event)) {
30    // System keys are always consumed regardless of whether they trigger an
31    // accelerator to prevent windows from seeing unexpected key up events.
32    Shell::GetInstance()->accelerator_controller()->Process(accelerator);
33    return true;
34  }
35  if (!ShouldProcessAcceleratorNow(key_event, accelerator))
36    return false;
37  return Shell::GetInstance()->accelerator_controller()->Process(accelerator);
38}
39
40// Uses the top level window so if the target is a web contents window the
41// containing parent window will be checked for the property.
42bool AcceleratorDelegate::CanConsumeSystemKeys(const ui::KeyEvent& event) {
43  aura::Window* target = static_cast<aura::Window*>(event.target());
44  DCHECK(target);
45  aura::Window* top_level = ::wm::GetToplevelWindow(target);
46  return top_level && wm::GetWindowState(top_level)->can_consume_system_keys();
47}
48
49// Returns true if the |accelerator| should be processed now, inside Ash's env
50// event filter.
51bool AcceleratorDelegate::ShouldProcessAcceleratorNow(
52    const ui::KeyEvent& event,
53    const ui::Accelerator& accelerator) {
54  aura::Window* target = static_cast<aura::Window*>(event.target());
55  DCHECK(target);
56
57  aura::Window::Windows root_windows = Shell::GetAllRootWindows();
58  if (std::find(root_windows.begin(), root_windows.end(), target) !=
59      root_windows.end())
60    return true;
61
62  aura::Window* top_level = ::wm::GetToplevelWindow(target);
63  Shell* shell = Shell::GetInstance();
64
65  // Reserved accelerators (such as Power button) always have a prority.
66  if (shell->accelerator_controller()->IsReserved(accelerator))
67    return true;
68
69  // A full screen window has a right to handle all key events including the
70  // reserved ones.
71  if (top_level && wm::GetWindowState(top_level)->IsFullscreen()) {
72    // On ChromeOS, fullscreen windows are either browser or apps, which
73    // send key events to a web content first, then will process keys
74    // if the web content didn't consume them.
75    return false;
76  }
77
78  // Handle preferred accelerators (such as ALT-TAB) before sending
79  // to the target.
80  if (shell->accelerator_controller()->IsPreferred(accelerator))
81    return true;
82
83  return shell->GetAppListTargetVisibility();
84}
85
86}  // namespace ash
87