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//
// EventTarget.h
//
// Library: XML
// Package: DOM
// Module: DOMEvents
//
// Definition of the DOM EventTarget interface.
//
// Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH.
// and Contributors.
//
// SPDX-License-Identifier: BSL-1.0
//
#ifndef DOM_EventTarget_INCLUDED
#define DOM_EventTarget_INCLUDED
#include "Poco/XML/XML.h"
#include "Poco/DOM/DOMObject.h"
#include "Poco/XML/XMLString.h"
namespace Poco {
namespace XML {
class EventListener;
class Event;
class XML_API EventTarget: public DOMObject
/// The EventTarget interface is implemented by all Nodes in an implementation
/// which supports the DOM Event Model. Therefore, this interface can be obtained
/// by using binding-specific casting methods on an instance of the Node interface.
/// The interface allows registration and removal of EventListeners on an EventTarget
/// and dispatch of events to that EventTarget.
{
public:
virtual void addEventListener(const XMLString& type, EventListener* listener, bool useCapture) = 0;
/// This method allows the registration of event listeners on
/// the event target. If an EventListener is added to an
/// EventTarget while it is processing an event, it will not
/// be triggered by the current actions but may be triggered
/// during a later stage of event flow, such as the bubbling phase.
/// If multiple identical EventListeners are registered on the same
/// EventTarget with the same parameters the duplicate instances are
/// discarded. They do not cause the EventListener to be called twice and since they are
/// discarded they do not need to be removed with the removeEventListener method.
virtual void removeEventListener(const XMLString& type, EventListener* listener, bool useCapture) = 0;
/// This method allows the removal of event listeners from the event
/// target. If an EventListener is removed from an EventTarget while it is
/// processing an event, it will not be triggered by the current actions.
/// EventListeners can never be invoked after being removed.
/// Calling removeEventListener with arguments which do not identify
/// any currently registered EventListener on the EventTarget has no effect.
virtual bool dispatchEvent(Event* evt) = 0;
/// This method allows the dispatch of events into the implementations
/// event model. Events dispatched in this manner will have the same capturing and
/// bubbling behavior as events dispatched directly by the
/// implementation. The target of the event is the EventTarget on
/// which dispatchEvent is called.
protected:
virtual ~EventTarget();
};
} } // namespace Poco::XML
#endif // DOM_EventTarget_INCLUDED
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