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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.
#ifndef UI_EVENTS_EVENT_TARGET_H_
#define UI_EVENTS_EVENT_TARGET_H_
#include "base/basictypes.h"
#include "base/compiler_specific.h"
#include "ui/base/ui_export.h"
#include "ui/events/event_handler.h"
namespace ui {
class EventDispatcher;
class UI_EXPORT EventTarget : public EventHandler {
public:
typedef std::vector<EventTarget*> EventTargets;
class TestApi {
public:
explicit TestApi(EventTarget* target) : target_(target) {}
const EventHandlerList& pre_target_handlers() {
return target_->pre_target_list_;
}
private:
TestApi();
EventTarget* target_;
DISALLOW_COPY_AND_ASSIGN(TestApi);
};
class DispatcherApi {
public:
explicit DispatcherApi(EventTarget* target) : target_(target) {}
const EventHandlerList& pre_target_list() const {
return target_->pre_target_list_;
}
private:
DispatcherApi();
EventTarget* target_;
DISALLOW_COPY_AND_ASSIGN(DispatcherApi);
};
EventTarget();
virtual ~EventTarget();
virtual bool CanAcceptEvent(const ui::Event& event) = 0;
virtual EventTarget* GetParentTarget() = 0;
// Adds a handler to receive events before the target. The handler must be
// explicitly removed from the target before the handler is destroyed. The
// EventTarget does not take ownership of the handler.
void AddPreTargetHandler(EventHandler* handler);
// Same as AddPreTargetHandler except that the |handler| is added to the front
// of the list so it is the first one to receive events.
void PrependPreTargetHandler(EventHandler* handler);
void RemovePreTargetHandler(EventHandler* handler);
// Adds a handler to receive events after the target. The handler must be
// explicitly removed from the target before the handler is destroyed. The
// EventTarget does not take ownership of the handler.
void AddPostTargetHandler(EventHandler* handler);
void RemovePostTargetHandler(EventHandler* handler);
protected:
void set_target_handler(EventHandler* handler) {
target_handler_ = handler;
}
// Overridden from EventHandler:
virtual void OnEvent(Event* event) OVERRIDE;
virtual void OnKeyEvent(KeyEvent* event) OVERRIDE;
virtual void OnMouseEvent(MouseEvent* event) OVERRIDE;
virtual void OnScrollEvent(ScrollEvent* event) OVERRIDE;
virtual void OnTouchEvent(TouchEvent* event) OVERRIDE;
virtual void OnGestureEvent(GestureEvent* event) OVERRIDE;
private:
friend class EventDispatcher;
// Returns the list of handlers that should receive the event before the
// target. The handlers from the outermost target are first in the list, and
// the handlers on |this| are the last in the list.
void GetPreTargetHandlers(EventHandlerList* list);
// Returns the list of handlers that should receive the event after the
// target. The handlers from the outermost target are last in the list, and
// the handlers on |this| are the first in the list.
void GetPostTargetHandlers(EventHandlerList* list);
EventHandlerList pre_target_list_;
EventHandlerList post_target_list_;
EventHandler* target_handler_;
DISALLOW_COPY_AND_ASSIGN(EventTarget);
};
} // namespace ui
#endif // UI_EVENTS_EVENT_TARGET_H_
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