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
17namespace ash {
18
19namespace {
20
21bool HasFocusableWindow() {
22  return !MruWindowTracker::BuildWindowList(false).empty();
23}
24
25}  // namespace
26
27namespace internal {
28
29FocusCycler::FocusCycler() : widget_activating_(NULL) {
30}
31
32FocusCycler::~FocusCycler() {
33}
34
35void FocusCycler::AddWidget(views::Widget* widget) {
36  widgets_.push_back(widget);
37}
38
39void 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
104bool 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
116