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// Copyright 2012 The Chromium Authors
// 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 "base/ranges/algorithm.h"
#include "ui/views/accessible_pane_view.h"
#include "ui/views/focus/focus_search.h"
#include "ui/views/widget/widget.h"
#include "ui/views/widget/widget_delegate.h"
#include "ui/wm/public/activation_client.h"
namespace ash {
namespace {
bool HasFocusableWindow() {
return !Shell::Get()
->mru_window_tracker()
->BuildMruWindowList(kActiveDesk)
.empty();
}
} // namespace
FocusCycler::FocusCycler() : widget_activating_(nullptr) {}
FocusCycler::~FocusCycler() = default;
void FocusCycler::AddWidget(views::Widget* widget) {
widgets_.push_back(widget);
}
void FocusCycler::RemoveWidget(views::Widget* widget) {
auto iter = base::ranges::find(widgets_, widget);
if (iter != widgets_.end())
widgets_.erase(iter);
}
void FocusCycler::RotateFocus(Direction direction, bool move_onto_next_widget) {
if (aura::Window* window = window_util::GetActiveWindow(); window) {
views::Widget* widget = views::Widget::GetWidgetForNativeView(window);
// First try to rotate focus within the active widget. If that succeeds,
// we're done.
if (widget && !move_onto_next_widget &&
widget->GetFocusManager()->RotatePaneFocus(
direction == BACKWARD ? views::FocusManager::Direction::kBackward
: views::FocusManager::Direction::kForward,
views::FocusManager::FocusCycleWrapping::kDisabled)) {
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::Get()->mru_window_tracker()->BuildMruWindowList(kActiveDesk));
if (mru_windows.empty())
break;
auto* window = mru_windows.front();
WindowState::Get(window)->Activate();
views::Widget* widget = views::Widget::GetWidgetForNativeView(window);
if (!widget)
break;
views::FocusManager* focus_manager = widget->GetFocusManager();
focus_manager->ClearFocus();
focus_manager->RotatePaneFocus(
direction == BACKWARD ? views::FocusManager::Direction::kBackward
: views::FocusManager::Direction::kForward,
views::FocusManager::FocusCycleWrapping::kEnabled);
break;
} else {
if (FocusWidget(widgets_[index]))
break;
}
}
}
bool FocusCycler::FocusWidget(views::Widget* widget) {
// If the target is PIP window, temporarily make it activatable.
if (WindowState::Get(widget->GetNativeWindow())->IsPip())
widget->widget_delegate()->SetCanActivate(true);
// 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_ = nullptr;
return widget->IsActive();
}
views::Widget* FocusCycler::FindWidget(
base::RepeatingCallback<bool(views::Widget*)> callback) {
for (auto* widget : widgets_) {
if (callback.Run(widget))
return widget;
}
return nullptr;
}
} // namespace ash
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