ash/focus_cycler.cc

   1 // Copyright (c) 2012 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/focus_cycler.h"
   6
   7 #include "ash/shell.h"
   8 #include "ash/wm/mru_window_tracker.h"
   9 #include "ash/wm/window_cycle_controller.h"
  10 #include "ash/wm/window_util.h"
  11 #include "ui/aura/client/activation_client.h"
  12 #include "ui/aura/window.h"
  13 #include "ui/views/accessible_pane_view.h"
  14 #include "ui/views/focus/focus_search.h"
  15 #include "ui/views/widget/widget.h"
  16
  17 namespace ash {
  18
  19 namespace {
  20
  21 bool HasFocusableWindow() {
  22   return !MruWindowTracker::BuildWindowList(false).empty();
  23 }
  24
  25 }  // namespace
  26
  27 namespace internal {
  28
  29 FocusCycler::FocusCycler() : widget_activating_(NULL) {
  30 }
  31
  32 FocusCycler::~FocusCycler() {
  33 }
  34
  35 void FocusCycler::AddWidget(views::Widget* widget) {
  36   widgets_.push_back(widget);
  37 }
  38
  39 void FocusCycler::RotateFocus(Direction direction) {
  40   aura::Window* window = ash::wm::GetActiveWindow();
  41   if (window) {
  42     views::Widget* widget = views::Widget::GetWidgetForNativeWindow(window);
  43     // First try to rotate focus within the active widget. If that succeeds,
  44     // we're done.
  45     if (widget && widget->GetFocusManager()->RotatePaneFocus(
  46             direction == BACKWARD ?
  47                 views::FocusManager::kBackward : views::FocusManager::kForward,
  48             views::FocusManager::kNoWrap)) {
  49       return;
  50     }
  51   }
  52
  53   const bool has_window = HasFocusableWindow();
  54   int index = 0;
  55   int count = static_cast<int>(widgets_.size());
  56   int browser_index = has_window ? count : -1;
  57
  58   for (; index < count; ++index) {
  59     if (widgets_[index]->IsActive())
  60       break;
  61   }
  62
  63   int start_index = index;
  64
  65   if (has_window)
  66     ++count;
  67
  68   for (;;) {
  69     if (direction == FORWARD)
  70       index = (index + 1) % count;
  71     else
  72       index = ((index - 1) + count) % count;
  73
  74     // Ensure that we don't loop more than once.
  75     if (index == start_index)
  76       break;
  77
  78     if (index == browser_index) {
  79       // Activate the most recently active browser window.
  80       ash::Shell::GetInstance()->window_cycle_controller()->HandleCycleWindow(
  81           WindowCycleController::FORWARD, false);
  82
  83       // Rotate pane focus within that window.
  84       aura::Window* window = ash::wm::GetActiveWindow();
  85       if (!window)
  86         break;
  87       views::Widget* widget = views::Widget::GetWidgetForNativeWindow(window);
  88       if (!widget)
  89         break;
  90       views::FocusManager* focus_manager = widget->GetFocusManager();
  91       focus_manager->ClearFocus();
  92       focus_manager->RotatePaneFocus(
  93           direction == BACKWARD ?
  94               views::FocusManager::kBackward : views::FocusManager::kForward,
  95           views::FocusManager::kWrap);
  96       break;
  97     } else {
  98       if (FocusWidget(widgets_[index]))
  99         break;
 100     }
 101   }
 102 }
 103
 104 bool FocusCycler::FocusWidget(views::Widget* widget) {
 105   // Note: It is not necessary to set the focus directly to the pane since that
 106   // will be taken care of by the widget activation.
 107   widget_activating_ = widget;
 108   widget->Activate();
 109   widget_activating_ = NULL;
 110   return widget->IsActive();
 111 }
 112
 113 }  // namespace internal
 114
 115 }  // namespace ash