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von raredesign | Dez 3, 2019 | Allgemein | 0 Kommentare
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| Current Path : /proc/self/root/usr/include/CLAM/ |
| Current File : //proc/self/root/usr/include/CLAM/InControl.hxx |
/*
* Copyright (c) 2001-2004 MUSIC TECHNOLOGY GROUP (MTG)
* UNIVERSITAT POMPEU FABRA
*
*
* 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 2 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#ifndef _InControl_
#define _InControl_
#include <string>
#include <list>
#include <typeinfo>
#include <sstream>
#include "TypeInfo.hxx"
#include "InControlBase.hxx"
#include "OutControlBase.hxx"
namespace CLAM {
class Processing;
class OutControlBase;
template<class ControlDataType>
class OutControl;
/**
* An InControl receives values of the template type in an asyncronous pace.
* A processing method can be set as callback to respond to incoming events.
* You can also consult GetLastValue to get the last received value.
*/
template<class ControlDataType>
class InControl : public InControlBase
{
class Callback;
private:
Callback * _callback;
protected:
ControlDataType mLastValue;
public:
/// Constructor to use when no callback is used
InControl(const std::string &name = "unnamed in control", Processing * proc = 0)
: InControlBase(name,proc)
, _callback(new NullCallback)
{
}
/// Constructor to use a callback by const reference
template <typename ProcessingType, typename ParameterType>
InControl(const std::string &name, ProcessingType * proc, void (ProcessingType::*callback)(const ParameterType&))
: InControlBase(name,proc)
, _callback(new MethodCallback<ProcessingType,ParameterType>(proc, callback))
{
}
/// Constructor to use a callback by const reference plus a port id to distinguish different caller controls in a single serving callback
template <typename ProcessingType, typename ParameterType>
InControl(unsigned id, const std::string &name, ProcessingType * proc, void (ProcessingType::*callback)(unsigned, const ParameterType&))
: InControlBase(name,proc)
, _callback(new MethodCallbackWithId<ProcessingType,ParameterType>(proc, callback, id))
{
}
/// Constructor to use a callback by copy
template <typename ProcessingType, typename ParameterType>
InControl(const std::string &name, ProcessingType * proc, void (ProcessingType::*callback)(ParameterType))
: InControlBase(name,proc)
, _callback(new MethodCallbackByCopy<ProcessingType,ParameterType>(proc, callback))
{
}
/// Constructor to use a callback by copy plus a port id to distinguish different caller controls in a single serving callback
template <typename ProcessingType, typename ParameterType>
InControl(unsigned id, const std::string &name, ProcessingType * proc, void (ProcessingType::*callback)(unsigned, ParameterType))
: InControlBase(name,proc)
, _callback(new MethodCallbackByCopyWithId<ProcessingType,ParameterType>(proc, callback, id))
{
}
virtual ~InControl()
{
delete _callback;
}
/// The control receives a value when this method gets called.
/// Associated callback if any, gets triggered on result.
/// Connected OutControl may trigger it but it also may be
/// called directly, for example to set the initial value.
virtual void DoControl(const ControlDataType& val)
{
mLastValue = val;
_hasBeenRead=false;
_callback->DoControl(val);
};
/// Returns the last received value
virtual const ControlDataType& GetLastValue() const
{
_hasBeenRead=true;
return mLastValue;
};
/// Convenience method to get the string representation of the last value.
/// This just works if the token is storable as XML leaf, if not a "Not printable"
/// string is given.
const std::string GetLastValueAsString() // TODO: Use plugins as soon we start to use non streamable types
{
return GetLastValueAsString((TokenIsStorableAsLeaf*)0);
}
// For the typed linking check
virtual const std::type_info& GetTypeId() const { return typeid(ControlDataType); };
private:
std::string GetLastValueAsString(StaticFalse* /*isStreamable*/) const
{
return "Not printable";
}
/** @return A string with the extracted XML content */
std::string GetLastValueAsString(StaticTrue* /*isStreamable*/) const
{
std::ostringstream valueStream;
valueStream << GetLastValue();
return valueStream.str();
}
private:
// Callback wrappers
/// Base control callback wrapper. It defines the interface for callback wrappers.
typedef typename TypeInfo<ControlDataType>::StorableAsLeaf TokenIsStorableAsLeaf;
class Callback
{
public:
virtual ~Callback() {}
virtual void DoControl(const ControlDataType & val) =0;
};
/// Null control callback wrapper. Just do nothing.
class NullCallback : public Callback
{
public:
virtual void DoControl(const ControlDataType & val) {}
};
/// Processing method callback wrapper.
/// Calls a processing method that receives the value as const reference.
template <typename ProcessingType, typename ValueParameterType>
class MethodCallback : public Callback
{
protected:
ProcessingType * _processing;
void (ProcessingType::*_method)(const ValueParameterType& );
public:
MethodCallback(ProcessingType * processing, void (ProcessingType::*method)(const ValueParameterType &) )
: _processing(processing)
, _method(method)
{
}
virtual void DoControl(const ControlDataType & value)
{
(_processing->*_method)(value);
}
};
/// Processing method callback wrapper with control id.
/// Calls a processing method that receives the value as const reference.
/// The id enables reusing the same callback for different controls,
/// but still knowing the originating control.
template <typename ProcessingType, typename ValueParameterType>
class MethodCallbackWithId : public Callback
{
ProcessingType * _processing;
void (ProcessingType::*_method)(unsigned, const ValueParameterType &);
unsigned _id;
public:
MethodCallbackWithId(ProcessingType * processing, void (ProcessingType::*method)(unsigned,const ValueParameterType &), unsigned id )
: _processing(processing)
, _method(method)
, _id(id)
{
}
virtual void DoControl(const ControlDataType & value)
{
(_processing->*_method)(_id, value);
}
};
/// Processing method callback wrapper by copy.
/// Calls a processing method that receives the control value by copy.
/// To use with basic (cheap copy) objects (ints, bools, floats...)
template <typename ProcessingType, typename ValueParameterType>
class MethodCallbackByCopy : public Callback
{
protected:
ProcessingType * _processing;
void (ProcessingType::*_method)(ValueParameterType);
public:
MethodCallbackByCopy(ProcessingType * processing, void (ProcessingType::*method)(ValueParameterType) )
: _processing(processing)
, _method(method)
{
}
virtual void DoControl(const ControlDataType & value)
{
(_processing->*_method)(value);
}
};
/// Processing method callback wrapper by copy with control id.
/// Calls a processing method that receives the control value by copy.
/// To use with basic (cheap copy) objects (ints, bools, floats...)
/// The id enables reusing the same callback for different controls,
/// but still knowing the originating control.
template <typename ProcessingType, typename ValueParameterType>
class MethodCallbackByCopyWithId : public Callback
{
ProcessingType * _processing;
void (ProcessingType::*_method)(unsigned, ValueParameterType);
unsigned _id;
public:
MethodCallbackByCopyWithId(ProcessingType * processing, void (ProcessingType::*method)(unsigned,ValueParameterType), unsigned id )
: _processing(processing)
, _method(method)
, _id(id)
{
}
virtual void DoControl(const ControlDataType & value)
{
(_processing->*_method)(_id, value);
}
};
};
/// Alias provided by convenience to ease the transitions to typed controls
typedef InControl<float> FloatInControl;
} // End namespace CLAM
#endif //_InControl_
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