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
17namespace ash {
18
19namespace {
20
21bool HasFocusableWindow() {
22  return !MruWindowTracker::BuildWindowList(false).empty();
23}
24
25}  // namespace
26
27FocusCycler::FocusCycler() : widget_activating_(NULL) {
28}
29
30FocusCycler::~FocusCycler() {
31}
32
33void FocusCycler::AddWidget(views::Widget* widget) {
34  widgets_.push_back(widget);
35}
36
37void 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
101bool 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
111