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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "ash/focus_cycler.h"
#include "ash/shell.h"
#include "ash/wm/mru_window_tracker.h"
#include "ash/wm/window_state.h"
#include "ash/wm/window_util.h"
#include "ui/aura/window.h"
#include "ui/views/accessible_pane_view.h"
#include "ui/views/focus/focus_search.h"
#include "ui/views/widget/widget.h"
#include "ui/wm/public/activation_client.h"
namespace ash {
namespace {
bool HasFocusableWindow() {
return !ash::Shell::GetInstance()->
mru_window_tracker()->BuildMruWindowList().empty();
}
} // namespace
FocusCycler::FocusCycler() : widget_activating_(NULL) {
}
FocusCycler::~FocusCycler() {
}
void FocusCycler::AddWidget(views::Widget* widget) {
widgets_.push_back(widget);
}
void FocusCycler::RemoveWidget(views::Widget* widget) {
auto iter = std::find(widgets_.begin(), widgets_.end(), widget);
if (iter != widgets_.end())
widgets_.erase(iter);
}
void FocusCycler::RotateFocus(Direction direction) {
aura::Window* window = ash::wm::GetActiveWindow();
if (window) {
views::Widget* widget = views::Widget::GetWidgetForNativeWindow(window);
// First try to rotate focus within the active widget. If that succeeds,
// we're done.
if (widget && widget->GetFocusManager()->RotatePaneFocus(
direction == BACKWARD ?
views::FocusManager::kBackward : views::FocusManager::kForward,
views::FocusManager::kNoWrap)) {
return;
}
}
const bool has_window = HasFocusableWindow();
int index = 0;
int count = static_cast<int>(widgets_.size());
int browser_index = has_window ? count : -1;
for (; index < count; ++index) {
if (widgets_[index]->IsActive())
break;
}
int start_index = index;
if (has_window)
++count;
for (;;) {
if (direction == FORWARD)
index = (index + 1) % count;
else
index = ((index - 1) + count) % count;
// Ensure that we don't loop more than once.
if (index == start_index)
break;
if (index == browser_index) {
// Activate the most recently active browser window.
MruWindowTracker::WindowList mru_windows(
Shell::GetInstance()->mru_window_tracker()->BuildMruWindowList());
if (mru_windows.empty())
break;
aura::Window* window = mru_windows.front();
wm::GetWindowState(window)->Activate();
views::Widget* widget = views::Widget::GetWidgetForNativeWindow(window);
if (!widget)
break;
views::FocusManager* focus_manager = widget->GetFocusManager();
focus_manager->ClearFocus();
focus_manager->RotatePaneFocus(
direction == BACKWARD ?
views::FocusManager::kBackward : views::FocusManager::kForward,
views::FocusManager::kWrap);
break;
} else {
if (FocusWidget(widgets_[index]))
break;
}
}
}
bool FocusCycler::FocusWidget(views::Widget* widget) {
// Note: It is not necessary to set the focus directly to the pane since that
// will be taken care of by the widget activation.
widget_activating_ = widget;
widget->Activate();
widget_activating_ = NULL;
return widget->IsActive();
}
} // namespace ash
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