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/window_cycle_controller.h"
   9 #include "ui/aura/client/activation_client.h"
  10 #include "ui/aura/window.h"
  11 #include "ui/views/accessible_pane_view.h"
  12 #include "ui/views/focus/focus_search.h"
  13 #include "ui/views/widget/widget.h"
  14
  15 namespace ash {
  16
  17 namespace {
  18
  19 bool HasFocusableWindow() {
  20   return !WindowCycleController::BuildWindowList(NULL).empty();
  21 }
  22
  23 }  // namespace
  24
  25 namespace internal {
  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   const bool has_window = HasFocusableWindow();
  39   int index = 0;
  40   int count = static_cast<int>(widgets_.size());
  41   int browser_index = has_window ? count : -1;
  42
  43   for (; index < count; ++index) {
  44     if (widgets_[index]->IsActive())
  45       break;
  46   }
  47
  48   int start_index = index;
  49
  50   if (has_window)
  51     ++count;
  52
  53   for (;;) {
  54     if (direction == FORWARD)
  55       index = (index + 1) % count;
  56     else
  57       index = ((index - 1) + count) % count;
  58
  59     // Ensure that we don't loop more than once.
  60     if (index == start_index)
  61       break;
  62
  63     if (index == browser_index) {
  64       // Activate the first window.
  65       WindowCycleController::Direction window_direction =
  66           direction == FORWARD ? WindowCycleController::FORWARD :
  67                                  WindowCycleController::BACKWARD;
  68       ash::Shell::GetInstance()->window_cycle_controller()->HandleCycleWindow(
  69           window_direction, false);
  70       break;
  71     } else {
  72       if (FocusWidget(widgets_[index]))
  73         break;
  74     }
  75   }
  76 }
  77
  78 bool FocusCycler::FocusWidget(views::Widget* widget) {
  79   views::AccessiblePaneView* view =
  80       static_cast<views::AccessiblePaneView*>(widget->GetContentsView());
  81   if (view->SetPaneFocusAndFocusDefault()) {
  82     widget_activating_ = widget;
  83     widget->Activate();
  84     widget_activating_ = NULL;
  85     if (widget->IsActive())
  86       return true;
  87   }
  88   return false;
  89 }
  90
  91 }  // namespace internal
  92
  93 }  // namespace ash