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// CharacterProxy.h - rebindable DisplayObject reference, for Gnash
//
// Copyright (C) 2005, 2006, 2007, 2008, 2009 Free Software Foundation, Inc.
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
#ifndef GNASH_CHARACTER_PROXY_H
#define GNASH_CHARACTER_PROXY_H
#include <string>
// Forward declarations
namespace gnash {
class DisplayObject;
}
namespace gnash {
/// A proxy for DisplayObject pointers.
//
/// The proxy will store a pointer to a DisplayObject until the
/// DisplayObject is destroyed, in which case it will only store the original
/// target path of it and always use that for rebinding when needed.
///
class CharacterProxy {
mutable DisplayObject* _ptr;
mutable std::string _tgt;
static DisplayObject* findDisplayObjectByTarget(const std::string& target);
/// If we still have a sprite pointer check if it was destroyed
/// in which case we drop the pointer and only keep the target.
void checkDangling() const;
public:
/// Construct a CharacterProxy pointing to the given sprite
CharacterProxy(DisplayObject* sp)
:
_ptr(sp)
{
checkDangling();
}
/// Construct a copy of the given CharacterProxy
//
/// @param sp
/// The CharacterProxy to make a copy of.
/// NOTE: if the given proxy is dangling, this proxy
/// will also be dangling. If you want to
/// create a non-dangling proxy you can
/// use the constructor taking a DisplayObject
/// as in CharacterProxy newProxy(oldProxy.get())
///
CharacterProxy(const CharacterProxy& sp)
{
sp.checkDangling();
_ptr=sp._ptr;
if ( ! _ptr ) _tgt=sp._tgt;
}
/// Make this proxy a copy of the given one
//
/// @param sp
/// The CharacterProxy to make a copy of.
/// NOTE: if the given proxy is dangling, this proxy
/// will also be dangling. If you want to
/// create a non-dangling proxy you can
/// use the constructor taking a DisplayObject
/// as in CharacterProxy newProxy(oldProxy.get())
///
CharacterProxy& operator=(const CharacterProxy& sp)
{
sp.checkDangling();
_ptr=sp._ptr;
if ( ! _ptr ) _tgt=sp._tgt;
return *this;
}
/// Get the pointed sprite, either original or rebound
//
/// @return the currently bound sprite, NULL if none
///
DisplayObject* get(bool skipRebinding=false) const
{
if ( skipRebinding ) return _ptr;
// set _ptr to NULL and _tgt to original target if destroyed
checkDangling();
if ( _ptr ) return _ptr;
else return findDisplayObjectByTarget(_tgt);
}
/// Get the sprite target, either current (if not dangling) or
/// bound one.
std::string getTarget() const;
/// Return true if this sprite is dangling
//
/// Dangling means that it doesn't have a pointer to the original
/// sprite anymore, not that it doesn't point to anything.
/// To know if it points to something or not use get(), which will
/// return NULL if it doesn't point to anyhing.
///
bool isDangling() const
{
checkDangling();
return !_ptr;
}
/// \brief
/// Two sprite_proxies are equal if they point to the
/// same sprite
///
bool operator==(const CharacterProxy& sp) const
{
return get() == sp.get();
}
/// Set the original sprite (if any) as reachable
//
/// NOTE: if this value is dangling, we won't keep anything
/// alive.
///
void setReachable() const;
};
} // end namespace gnash
#endif // GNASH_CHARACTER_PROXY_H
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