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// Copyright 2022 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_ACCESSIBILITY_EVENT_HANDLER_MANAGER_H_
#define ASH_ACCESSIBILITY_ACCESSIBILITY_EVENT_HANDLER_MANAGER_H_
#include <vector>
#include "base/memory/raw_ptr.h"
#include "ui/events/event_handler.h"
namespace ash {
// Manages ordering of the Accessibility event handlers so that the handlers
// with the highest priority get events before the others. For example,
// the cursor must always get events before magnifier so that it can be drawn,
// and magnifier must always get events before Select to Speak so that mouse
// moves cause the viewport to move.
class AccessibilityEventHandlerManager {
public:
// Ordered by priority. Earlier enums will get events before later ones.
// Create a new level for each type of accessibility EventHandler.
enum class HandlerType {
kMouseKeys = 0,
kCursor,
kFullscreenMagnifier,
kDockedMagnifier,
kChromeVox,
kAutoclick,
kSelectToSpeak,
kMaxValue = kSelectToSpeak,
};
AccessibilityEventHandlerManager();
AccessibilityEventHandlerManager(const AccessibilityEventHandlerManager&) =
delete;
AccessibilityEventHandlerManager& operator=(
const AccessibilityEventHandlerManager&) = delete;
~AccessibilityEventHandlerManager();
void AddAccessibilityEventHandler(
ui::EventHandler* handler,
AccessibilityEventHandlerManager::HandlerType type);
void RemoveAccessibilityEventHandler(ui::EventHandler* handler);
private:
void UpdateEventHandlers();
// List of the current event handlers, indexed by
// AccessibilityEventHandlerType.
std::vector<raw_ptr<ui::EventHandler, VectorExperimental>> event_handlers_;
};
} // namespace ash
#endif // ASH_ACCESSIBILITY_ACCESSIBILITY_EVENT_HANDLER_MANAGER_H_
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