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tdeio/tdefile

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  • tdefile
tdefilemetapreview.cpp
1 /*
2  * This file is part of the KDE project.
3  * Copyright (C) 2003 Carsten Pfeiffer <pfeiffer@kde.org>
4  *
5  * You can Freely distribute this program under the GNU Library General Public
6  * License. See the file "COPYING" for the exact licensing terms.
7  */
8 
9 #include "tdefilemetapreview.h"
10 
11 #include <tqlayout.h>
12 
13 #include <tdeio/previewjob.h>
14 #include <klibloader.h>
15 #include <kimagefilepreview.h>
16 #include <kmimetype.h>
17 
18 bool KFileMetaPreview::s_tryAudioPreview = true;
19 
20 KFileMetaPreview::KFileMetaPreview( TQWidget *parent, const char *name )
21  : KPreviewWidgetBase( parent, name ),
22  haveAudioPreview( false )
23 {
24  TQHBoxLayout *layout = new TQHBoxLayout( this, 0, 0 );
25  m_stack = new TQWidgetStack( this );
26  layout->addWidget( m_stack );
27 
28  // ###
29 // m_previewProviders.setAutoDelete( true );
30  initPreviewProviders();
31 }
32 
33 KFileMetaPreview::~KFileMetaPreview()
34 {
35 }
36 
37 void KFileMetaPreview::initPreviewProviders()
38 {
39  m_previewProviders.clear();
40  // hardcoded so far
41 
42  // image previews
43  KImageFilePreview *imagePreview = new KImageFilePreview( m_stack );
44  (void) m_stack->addWidget( imagePreview );
45  m_stack->raiseWidget( imagePreview );
46  resize( imagePreview->sizeHint() );
47 
48  TQStringList mimeTypes = imagePreview->supportedMimeTypes();
49  TQStringList::ConstIterator it = mimeTypes.begin();
50  for ( ; it != mimeTypes.end(); ++it )
51  {
52 // tqDebug(".... %s", (*it).latin1());
53  m_previewProviders.insert( *it, imagePreview );
54  }
55 }
56 
57 KPreviewWidgetBase * KFileMetaPreview::previewProviderFor( const TQString& mimeType )
58 {
59 // tqDebug("### looking for: %s", mimeType.latin1());
60  // often the first highlighted item, where we can be sure, there is no plugin
61  // (this "folders reflect icons" is a konq-specific thing, right?)
62  if ( mimeType == "inode/directory" )
63  return 0L;
64 
65  KPreviewWidgetBase *provider = m_previewProviders.find( mimeType );
66  if ( provider )
67  return provider;
68 
69 //tqDebug("#### didn't find anything for: %s", mimeType.latin1());
70 
71  if ( s_tryAudioPreview &&
72  !mimeType.startsWith("text/") && !mimeType.startsWith("image/") )
73  {
74  if ( !haveAudioPreview )
75  {
76  KPreviewWidgetBase *audioPreview = createAudioPreview( m_stack );
77  if ( audioPreview )
78  {
79  haveAudioPreview = true;
80  (void) m_stack->addWidget( audioPreview );
81  TQStringList mimeTypes = audioPreview->supportedMimeTypes();
82  TQStringList::ConstIterator it = mimeTypes.begin();
83  for ( ; it != mimeTypes.end(); ++it )
84  m_previewProviders.insert( *it, audioPreview );
85  }
86  }
87  }
88 
89  // with the new mimetypes from the audio-preview, try again
90  provider = m_previewProviders.find( mimeType );
91  if ( provider )
92  return provider;
93 
94  // ### mimetype may be image/* for example, try that
95  int index = mimeType.find( '/' );
96  if ( index > 0 )
97  {
98  provider = m_previewProviders.find( mimeType.left( index + 1 ) + "*" );
99  if ( provider )
100  return provider;
101  }
102 
103  KMimeType::Ptr mimeInfo = KMimeType::mimeType( mimeType );
104  if ( mimeInfo )
105  {
106  // check mime type inheritance
107  TQString parentMimeType = mimeInfo->parentMimeType();
108  while ( !parentMimeType.isEmpty() )
109  {
110  provider = m_previewProviders.find( parentMimeType );
111  if ( provider )
112  return provider;
113 
114  KMimeType::Ptr parentMimeInfo = KMimeType::mimeType( parentMimeType );
115  if ( !parentMimeInfo ) break;
116 
117  parentMimeType = parentMimeInfo->parentMimeType();
118  }
119 
120  // check X-TDE-Text property
121  TQVariant textProperty = mimeInfo->property( "X-TDE-text" );
122  if ( textProperty.isValid() && textProperty.type() == TQVariant::Bool )
123  {
124  if ( textProperty.toBool() )
125  {
126  provider = m_previewProviders.find( "text/plain" );
127  if ( provider )
128  return provider;
129 
130  provider = m_previewProviders.find( "text/*" );
131  if ( provider )
132  return provider;
133  }
134  }
135  }
136 
137  return 0L;
138 }
139 
140 void KFileMetaPreview::showPreview(const KURL &url)
141 {
142  KMimeType::Ptr mt = KMimeType::findByURL( url );
143  KPreviewWidgetBase *provider = previewProviderFor( mt->name() );
144  if ( provider )
145  {
146  if ( provider != m_stack->visibleWidget() ) // stop the previous preview
147  clearPreview();
148 
149  m_stack->setEnabled( true );
150  m_stack->raiseWidget( provider );
151  provider->showPreview( url );
152  }
153  else
154  {
155  clearPreview();
156  m_stack->setEnabled( false );
157  }
158 }
159 
160 void KFileMetaPreview::clearPreview()
161 {
162  if ( m_stack->visibleWidget() )
163  static_cast<KPreviewWidgetBase*>( m_stack->visibleWidget() )->clearPreview();
164 }
165 
166 void KFileMetaPreview::addPreviewProvider( const TQString& mimeType,
167  KPreviewWidgetBase *provider )
168 {
169  m_previewProviders.insert( mimeType, provider );
170 }
171 
172 void KFileMetaPreview::clearPreviewProviders()
173 {
174  TQDictIterator<KPreviewWidgetBase> it( m_previewProviders );
175  for ( ; it.current(); ++it )
176  m_stack->removeWidget( it.current() );
177 
178  m_previewProviders.clear();
179 }
180 
181 // static
182 KPreviewWidgetBase * KFileMetaPreview::createAudioPreview( TQWidget *parent )
183 {
184  KLibFactory *factory = KLibLoader::self()->factory( "tdefileaudiopreview" );
185  if ( !factory )
186  {
187  s_tryAudioPreview = false;
188  return 0L;
189  }
190 
191  return dynamic_cast<KPreviewWidgetBase*>( factory->create( TQT_TQOBJECT(parent), "tdefileaudiopreview" ));
192 }
193 
194 void KFileMetaPreview::virtual_hook( int, void* ) {}
195 
196 #include "tdefilemetapreview.moc"
KPreviewWidgetBase::showPreview
virtual void showPreview(const KURL &url)=0
This slot is called every time the user selects another file in the file dialog.
KImageFilePreview
Image preview widget for the file dialog.
Definition: kimagefilepreview.h:31
KPreviewWidgetBase
Abstract baseclass for all preview widgets which shall be used via KFileDialog::setPreviewWidget(cons...
Definition: kpreviewwidgetbase.h:44

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