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// Copyright 2018 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_ACCESSIBILITY_HIGHLIGHT_CONTROLLER_H_
#define ASH_ACCESSIBILITY_UI_ACCESSIBILITY_HIGHLIGHT_CONTROLLER_H_
#include "ash/accessibility/ui/native_focus_watcher.h"
#include "ash/ash_export.h"
#include "ui/aura/client/cursor_client_observer.h"
#include "ui/base/ime/input_method_observer.h"
#include "ui/events/event_handler.h"
#include "ui/gfx/geometry/point.h"
#include "ui/gfx/geometry/rect.h"
namespace ui {
class KeyEvent;
class InputMethod;
class MouseEvent;
class TextInputClient;
} // namespace ui
namespace ash {
// Controls visual highlights that Chrome OS can draw around the focused object,
// the cursor, and the text caret for accessibility.
class ASH_EXPORT AccessibilityHighlightController
: public ui::EventHandler,
public ui::InputMethodObserver,
public NativeFocusObserver,
public aura::client::CursorClientObserver {
public:
AccessibilityHighlightController();
AccessibilityHighlightController(const AccessibilityHighlightController&) =
delete;
AccessibilityHighlightController& operator=(
const AccessibilityHighlightController&) = delete;
~AccessibilityHighlightController() override;
void HighlightFocus(bool focus);
void HighlightCursor(bool cursor);
void HighlightCaret(bool caret);
void SetFocusHighlightRect(const gfx::Rect& bounds_in_screen);
// Updates the visual highlight position for the text input caret. Removes
// the highlight if the caret is not visible.
void SetCaretBounds(const gfx::Rect& caret_bounds_in_screen);
// ui::EventHandler:
void OnMouseEvent(ui::MouseEvent* event) override;
void OnKeyEvent(ui::KeyEvent* event) override;
// ui::InputMethodObserver:
void OnFocus() override {}
void OnBlur() override {}
void OnInputMethodDestroyed(const ui::InputMethod* input_method) override {}
void OnTextInputStateChanged(const ui::TextInputClient* client) override;
void OnCaretBoundsChanged(const ui::TextInputClient* client) override;
// aura::client::CursorClientObserver:
void OnCursorVisibilityChanged(bool is_visible) override;
// NativeFocusObserver:
void OnNativeFocusChanged(const gfx::Rect& bounds_in_screen) override;
void OnNativeFocusCleared() override;
private:
bool IsCursorVisible();
bool IsCaretVisible(const gfx::Rect& caret_bounds_in_screen);
void UpdateFocusAndCaretHighlights();
void UpdateCursorHighlight();
void SetWidget(views::Widget* widget);
bool focus_ = false;
gfx::Rect focus_rect_;
bool cursor_ = false;
gfx::Point cursor_point_;
bool caret_ = false;
bool caret_visible_ = false;
gfx::Point caret_point_;
std::unique_ptr<NativeFocusWatcher> native_focus_watcher_;
};
} // namespace ash
#endif // ASH_ACCESSIBILITY_UI_ACCESSIBILITY_HIGHLIGHT_CONTROLLER_H_
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