ash/accelerators/accelerator_delegate.cc

   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
  14 namespace ash {
  15 namespace {}  // namespace
  16
  17 AcceleratorDelegate::AcceleratorDelegate() {
  18 }
  19 AcceleratorDelegate::~AcceleratorDelegate() {
  20 }
  21
  22 bool 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.
  42 bool 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.
  51 bool 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