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