Source/WebCore/loader/ImageLoaderClient.h

/*
 * Copyright (C) 2012 Google Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 *     * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above
 * copyright notice, this list of conditions and the following disclaimer
 * in the documentation and/or other materials provided with the
 * distribution.
 *     * Neither the name of Google Inc. nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 */

#ifndef ImageLoaderClient_h
#define ImageLoaderClient_h

namespace WebCore {

class Element;

class ImageLoaderClient {
public:
    virtual ~ImageLoaderClient() { }

    virtual Element* sourceElement() = 0;
    virtual Element* imageElement() = 0;
    Element* eventTarget() { return sourceElement(); }

    virtual void refSourceElement() = 0;
    virtual void derefSourceElement() = 0;
};

template<typename T>
class ImageLoaderClientBase : public ImageLoaderClient {
public:
    Element* sourceElement() { return static_cast<T*>(this); }
    Element* imageElement() { return static_cast<T*>(this); }

    void refSourceElement() { static_cast<T*>(this)->ref(); }
    void derefSourceElement() { static_cast<T*>(this)->deref(); }
};

}

#endif