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      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 
     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       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 
    104 bool 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