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