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