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_state.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       MruWindowTracker::WindowList mru_windows(
  81           Shell::GetInstance()->mru_window_tracker()->BuildMruWindowList());
  82       if (mru_windows.empty())
  83         break;
  84       aura::Window* window = mru_windows.front();
  85       wm::GetWindowState(window)->Activate();
  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