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