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kdecoration_plugins_p.cpp
1 /*****************************************************************
2 This file is part of the KDE project.
3 
4 Copyright (C) 1999, 2000 Daniel M. Duley <mosfet@kde.org>
5 Copyright (C) 2003 Lubos Lunak <l.lunak@kde.org>
6 
7 Permission is hereby granted, free of charge, to any person obtaining a
8 copy of this software and associated documentation files (the "Software"),
9 to deal in the Software without restriction, including without limitation
10 the rights to use, copy, modify, merge, publish, distribute, sublicense,
11 and/or sell copies of the Software, and to permit persons to whom the
12 Software is furnished to do so, subject to the following conditions:
13 
14 The above copyright notice and this permission notice shall be included in
15 all copies or substantial portions of the Software.
16 
17 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
18 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
19 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
20 THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
21 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
22 FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
23 DEALINGS IN THE SOFTWARE.
24 ******************************************************************/
25 
26 #include "kdecoration_plugins_p.h"
27 
28 #include <tdeconfig.h>
29 #include <kdebug.h>
30 #include <tdelocale.h>
31 #include <klibloader.h>
32 #include <assert.h>
33 
34 #include <tqdir.h>
35 #include <tqfile.h>
36 
37 #include "kdecorationfactory.h"
38 
39 KDecorationPlugins::KDecorationPlugins( TDEConfig* cfg )
40  : create_ptr( NULL ),
41  library( NULL ),
42  fact( NULL ),
43  old_library( NULL ),
44  old_fact( NULL ),
45  pluginStr( "twin_undefined " ),
46  config( cfg )
47  {
48  }
49 
50 KDecorationPlugins::~KDecorationPlugins()
51  {
52  if(library)
53  {
54  assert( fact != NULL );
55  delete fact;
56  library->unload();
57  }
58  if(old_library)
59  {
60  assert( old_fact != NULL );
61  delete old_fact;
62  old_library->unload();
63  }
64  }
65 
66 bool KDecorationPlugins::reset( unsigned long changed )
67  {
68  TQString oldPlugin = pluginStr;
69  config->reparseConfiguration();
70  bool ret = false;
71  if(( !loadPlugin( "" ) && library ) // "" = read the one in cfg file
72  || oldPlugin == pluginStr )
73  { // no new plugin loaded, reset the old one
74  assert( fact != NULL );
75  ret = fact->reset( changed );
76  }
77  return ret || oldPlugin != pluginStr;
78  }
79 
80 KDecorationFactory* KDecorationPlugins::factory()
81  {
82  return fact;
83  }
84 
85 // convenience
86 KDecoration* KDecorationPlugins::createDecoration( KDecorationBridge* bridge )
87  {
88  if( fact != NULL )
89  return fact->createDecoration( bridge );
90  return NULL;
91  }
92 
93 // returns true if plugin was loaded successfully
94 bool KDecorationPlugins::loadPlugin( TQString nameStr )
95  {
96  if( nameStr.isEmpty())
97  {
98  TDEConfigGroupSaver saver( config, "Style" );
99  nameStr = config->readEntry("PluginLib", defaultPlugin );
100  }
101 
102  KLibrary *oldLibrary = library;
103  KDecorationFactory* oldFactory = fact;
104 
105  TQString path = KLibLoader::findLibrary(TQFile::encodeName(nameStr));
106 
107  // If the plugin was not found, try to find the default
108  if (path.isEmpty())
109  {
110  nameStr = defaultPlugin;
111  path = KLibLoader::findLibrary(TQFile::encodeName(nameStr));
112  }
113 
114  // If no library was found, exit twin with an error message
115  if (path.isEmpty())
116  {
117  error( i18n("No window decoration plugin library was found." ));
118  return false;
119  }
120 
121  // Check if this library is not already loaded.
122  if(pluginStr == nameStr)
123  return true;
124 
125  // Try loading the requested plugin
126  library = KLibLoader::self()->library(TQFile::encodeName(path));
127 
128  // If that fails, fall back to the default plugin
129  if (!library)
130  {
131  kdDebug() << " could not load library, try default plugin again" << endl;
132  nameStr = defaultPlugin;
133  if ( pluginStr == nameStr )
134  return true;
135  path = KLibLoader::findLibrary(TQFile::encodeName(nameStr));
136  if (!path.isEmpty())
137  library = KLibLoader::self()->library(TQFile::encodeName(path));
138  }
139 
140  if (!library)
141  {
142  error( i18n("The default decoration plugin is corrupt "
143  "and could not be loaded." ));
144  return false;
145  }
146 
147  create_ptr = NULL;
148  if( library->hasSymbol("create_factory"))
149  {
150  void* create_func = library->symbol("create_factory");
151  if(create_func)
152  create_ptr = (KDecorationFactory* (*)())create_func;
153  }
154  if(!create_ptr)
155  {
156  error( i18n( "The library %1 is not a TWin plugin." ).arg( path ));
157  library->unload();
158  return false;
159  }
160  fact = create_ptr();
161  fact->checkRequirements( this ); // let it check what is supported
162 
163  pluginStr = nameStr;
164 
165  // For clients in tdeartwork
166  TQString catalogue = nameStr;
167  catalogue.replace( "twin3_", "twin_" );
168  TDEGlobal::locale()->insertCatalogue( catalogue );
169  // For KCommonDecoration based clients
170  TDEGlobal::locale()->insertCatalogue( "twin_lib" );
171  // For clients in tdebase
172  TDEGlobal::locale()->insertCatalogue( "twin_clients" );
173  // For clients in tdeartwork
174  TDEGlobal::locale()->insertCatalogue( "twin_art_clients" );
175 
176  old_library = oldLibrary; // save for delayed destroying
177  old_fact = oldFactory;
178 
179  return true;
180 }
181 
182 void KDecorationPlugins::destroyPreviousPlugin()
183 {
184  // Destroy the old plugin
185  if(old_library)
186  {
187  delete old_fact;
188  old_fact = NULL;
189  old_library->unload();
190  old_library = NULL;
191  }
192 }
193 
194 void KDecorationPlugins::error( const TQString& )
195  {
196  }
KDecoration
This is the base class for a decoration object.
Definition: kdecoration.h:313

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