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#ifndef oxygendatamap_h
#define oxygendatamap_h
/*
* this file was largely taken from the oxygen gtk engine
* Copyright (c) 2010 Hugo Pereira Da Costa <[email protected]>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or(at your option ) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
* MA 02110-1301, USA.
*/
#include <cassert>
#include <map>
#include <gtk/gtk.h>
//! generic class to map data to widgets
/*
Note: I'm not sure about memory management. At some point one might need to allocate the registered
data on the heap rather than on the stack, to be able to safely pass the data pointer around via callbacks.
The current implementation should make that possible without external code change, provided that the map
content is properly deleted (as opposed to erased) in destructor and 'unregister' method.
*/
template <typename T>
class DataMap
{
public:
//! constructor
DataMap( void ):
_lastWidget( 0L ),
_lastData( 0L )
{}
virtual ~DataMap(){}
//! insert new widget
inline T& registerWidget( GtkWidget* widget )
{
T& data( _map.insert( std::make_pair( widget, T() ) ).first->second );
_lastWidget = widget;
_lastData = &data;
return data;
}
//! true if widget is in list
virtual bool contains( GtkWidget* widget )
{
// check against last widget
if( widget == _lastWidget ) return true;
// find in map, returns false if not found
typename Map::iterator iter = _map.find( widget );
if( iter == _map.end() ) return false;
// store as last widget/last data, to speed up lookup.
_lastWidget = widget;
_lastData = &iter->second;
return true;
}
//! return value
virtual T& value( GtkWidget* widget )
{
// check against last widget
if( widget == _lastWidget ) return *_lastData;
// find in map, abort if not found
typename Map::iterator iter( _map.find( widget ) );
assert( iter != _map.end() );
// store as last widget/last data, to speed up lookup.
_lastWidget = widget;
_lastData = &iter->second;
return iter->second;
}
//! erase
virtual void erase( GtkWidget* widget )
{
// clear last widget and data, if match
if( _lastWidget == widget )
{
_lastWidget = 0L;
_lastData = 0L;
}
// erase from map
_map.erase( widget );
}
//! connect all widgets in map
void connectAll( void )
{
for( typename Map::iterator iter = _map.begin(); iter != _map.end(); iter++ )
{ iter->second.connect( iter->first ); }
}
//! connect all widgets in map
void disconnectAll( void )
{
for( typename Map::iterator iter = _map.begin(); iter != _map.end(); iter++ )
{ iter->second.disconnect( iter->first ); }
}
//! erase
virtual void clear( void )
{
_lastWidget = 0L;
_lastData = 0L;
_map.clear();
}
//! retrieve internal map
typedef std::map<GtkWidget*, T> Map;
Map& map( void )
{ return _map; }
//! retrieve internal map
const Map& map( void ) const
{ return _map; }
protected:
//! copy constructor is private
DataMap( const DataMap& )
{ assert( false ); }
//! assignment operator
DataMap& operator = ( const DataMap& )
{
assert( false );
return *this;
}
private:
//! pointer to last inquired widget
GtkWidget* _lastWidget;
//! pointer to last retrieved data
T* _lastData;
//! internal map between widget and data
Map _map;
};
#endif
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