libyui  3.0.10
/usr/src/RPM/BUILD/libyui-3.0.10/src/YGraphPlugin.h
00001 /*
00002   Copyright (C) 2000-2012 Novell, Inc
00003   This library is free software; you can redistribute it and/or modify
00004   it under the terms of the GNU Lesser General Public License as
00005   published by the Free Software Foundation; either version 2.1 of the
00006   License, or (at your option) version 3.0 of the License. This library
00007   is distributed in the hope that it will be useful, but WITHOUT ANY
00008   WARRANTY; without even the implied warranty of MERCHANTABILITY or 
00009   FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
00010   License for more details. You should have received a copy of the GNU
00011   Lesser General Public License along with this library; if not, write
00012   to the Free Software Foundation, Inc., 51 Franklin Street, Fifth
00013   Floor, Boston, MA 02110-1301 USA
00014 */
00015 
00016 
00017 /*-/
00018 
00019   File:         YGraphPlugin.h
00020 
00021   Author:       Arvin Schnell <aschnell@suse.de>
00022 
00023 /-*/
00024 
00025 #ifndef YGraphPlugin_h
00026 #define YGraphPlugin_h
00027 
00028 #include "YUIPlugin.h"
00029 
00030 class YWidget;
00031 class YGraph;
00032 
00033 
00034 /**
00035  * Abstract base class for simplified access to UI plugins for graph widget.
00036  **/
00037 class YGraphPlugin : public YUIPlugin
00038 {
00039 protected:
00040     /**
00041      * Constructor: Load the specified plugin library
00042      * from the standard UI plugin directory (/usr/lib/yui/).
00043      **/
00044     YGraphPlugin( const char * pluginLibBaseName )
00045         : YUIPlugin( pluginLibBaseName ) {}
00046 
00047     /**
00048      * Destructor. Calls dlclose() which will unload the plugin library if it
00049      * is no longer used, i.e. if the reference count dlopen() uses reaches 0.
00050      **/
00051     virtual ~YGraphPlugin() {}
00052 
00053 public:
00054     /**
00055      * Create a graph widget.
00056      * Derived classes need to implement this.
00057      *
00058      * This might return 0 if the plugin lib could not be loaded or if the
00059      * appropriate symbol could not be located in the plugin lib.
00060      **/
00061     virtual YGraph * createGraph( YWidget * parent, const std::string & filename,
00062                                   const std::string & layoutAlgorithm ) = 0;
00063 };
00064 
00065 
00066 #endif // YGraphPlugin_h
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