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// Copyright 2024 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef ASH_ACCESSIBILITY_UI_NATIVE_FOCUS_WATCHER_H_
#define ASH_ACCESSIBILITY_UI_NATIVE_FOCUS_WATCHER_H_
#include "base/observer_list.h"
#include "base/observer_list_types.h"
#include "ui/views/focus/focus_manager.h"
#include "ui/views/focus/widget_focus_manager.h"
#include "ui/views/widget/widget.h"
#include "ui/views/widget/widget_observer.h"
namespace ash {
// Observes changes to the bounds of the natively focused element.
class NativeFocusObserver : public base::CheckedObserver {
public:
virtual void OnNativeFocusChanged(const gfx::Rect& bounds_in_screen) = 0;
virtual void OnNativeFocusCleared() = 0;
protected:
~NativeFocusObserver() override = default;
};
// Watches for native focus changes across all windows and widgets. Calls
// registered `NativeFocusObserver`s on focus changes.
class NativeFocusWatcher : public views::WidgetFocusChangeListener,
public views::FocusChangeListener,
public views::WidgetObserver {
public:
NativeFocusWatcher();
NativeFocusWatcher(const NativeFocusWatcher&) = delete;
NativeFocusWatcher& operator=(const NativeFocusWatcher&) = delete;
~NativeFocusWatcher() override;
// Starts or stops watching for native focus changes.
void SetEnabled(bool enabled);
void AddObserver(NativeFocusObserver* observer);
void RemoveObserver(NativeFocusObserver* observer);
private:
// Sets the focused |widget|.
void SetWidget(views::Widget* widget);
// Updates the focus rect and calls the observers.
void UpdateFocusedView();
// views::WidgetObserver:
void OnWidgetDestroying(views::Widget* widget) override;
void OnWidgetBoundsChanged(views::Widget* widget,
const gfx::Rect& new_bounds) override;
// views::WidgetFocusChangeListener:
void OnNativeFocusChanged(gfx::NativeView focused_now) override;
// views::FocusChangeListener:
void OnDidChangeFocus(views::View* focused_before,
views::View* focused_now) override;
bool enabled_ = false;
base::ObserverList<NativeFocusObserver> observers_;
raw_ptr<views::Widget> widget_ = nullptr;
};
} // namespace ash
#endif // ASH_ACCESSIBILITY_UI_NATIVE_FOCUS_WATCHER_H_
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