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/*
* Copyright 2006 The Android Open Source Project
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef SkEventSink_DEFINED
#define SkEventSink_DEFINED
#include "SkRefCnt.h"
#include "SkEvent.h"
/** \class SkEventSink
SkEventSink is the base class for all objects that receive SkEvents.
*/
class SkEventSink : public SkRefCnt {
public:
SkEventSink();
virtual ~SkEventSink();
/**
* Returns this eventsink's unique ID. Use this to post SkEvents to
* this eventsink.
*/
SkEventSinkID getSinkID() const { return fID; }
/**
* Call this to pass an event to this object for processing. Returns true if the
* event was handled.
*/
bool doEvent(const SkEvent&);
/** Returns true if the sink (or one of its subclasses) understands the event as a query.
If so, the sink may modify the event to communicate its "answer".
*/
bool doQuery(SkEvent* query);
/**
* Returns the matching eventsink, or null if not found
*/
static SkEventSink* FindSink(SkEventSinkID);
protected:
/** Override this to handle events in your subclass. Be sure to call the inherited version
for events that you don't handle.
*/
virtual bool onEvent(const SkEvent&);
virtual bool onQuery(SkEvent*);
private:
SkEventSinkID fID;
// for our private link-list
SkEventSink* fNextSink;
typedef SkRefCnt INHERITED;
};
#endif
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