src/tagcloud/resourcetaggingwidget.cpp

   1 /*
   2    This file is part of the Nepomuk KDE project.
   3    Copyright (C) 2007 Sebastian Trueg <trueg@kde.org>
   4
   5    This library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Library General Public
   7    License version 2 as published by the Free Software Foundation.
   8
   9    This library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Library General Public License for more details.
  13
  14    You should have received a copy of the GNU Library General Public License
  15    along with this library; see the file COPYING.LIB.  If not, write to
  16    the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  17    Boston, MA 02110-1301, USA.
  18  */
  19
  20 #include "resourcetaggingwidget.h"
  21 #include "tagcloud.h"
  22 #include "taggingpopup.h"
  23
  24 #include <QtGui/QVBoxLayout>
  25 #include <QtGui/QContextMenuEvent>
  26 #include <QtGui/QCursor>
  27 #include <QtGui/QLabel>
  28 #include <QtCore/QSet>
  29
  30 #include <KLocale>
  31
  32 namespace Nepomuk {
  33     inline uint qHash( const Tag& res )
  34     {
  35         return qHash( res.resourceUri().toString() );
  36     }
  37 }
  38
  39
  40 class Nepomuk::ResourceTaggingWidget::Private
  41 {
  42 public:
  43     QList<Nepomuk::Resource> resources;
  44
  45     TagCloud* resourceTagCloud;
  46     TaggingPopup* popup;
  47
  48     QList<Tag> resourceTags;
  49
  50     void showTaggingPopup( const QPoint& );
  51     void _k_slotShowTaggingPopup();
  52     static QList<Tag> intersectTags( const QList<Resource>& );
  53 };
  54
  55
  56 void Nepomuk::ResourceTaggingWidget::Private::showTaggingPopup( const QPoint& pos )
  57 {
  58     popup->showAllTags();
  59     resourceTags = intersectTags( resources );
  60     Q_FOREACH( Tag tag, resourceTags ) {
  61         popup->setTagSelected( tag, true );
  62     }
  63
  64     popup->exec( pos );
  65
  66     foreach( Resource res, resources ) {
  67         res.setTags( resourceTags );
  68     }
  69
  70     resourceTagCloud->showTags( resourceTags );
  71 }
  72
  73
  74 void Nepomuk::ResourceTaggingWidget::Private::_k_slotShowTaggingPopup()
  75 {
  76     showTaggingPopup( QCursor::pos() );
  77 }
  78
  79
  80 QList<Nepomuk::Tag> Nepomuk::ResourceTaggingWidget::Private::intersectTags( const QList<Resource>& res )
  81 {
  82     if ( res.count() == 1 ) {
  83         return res.first().tags();
  84     }
  85     else if ( !res.isEmpty() ) {
  86         // determine the tags used for all resources
  87         QSet<Tag> tags = QSet<Tag>::fromList( res.first().tags() );
  88         QList<Resource>::const_iterator it = res.begin();
  89         for ( ++it; it != res.end(); ++it ) {
  90             tags.intersect( QSet<Tag>::fromList( (*it).tags() ) );
  91         }
  92         return tags.values();
  93     }
  94     else {
  95         return QList<Tag>();
  96     }
  97 }
  98
  99
 100 Nepomuk::ResourceTaggingWidget::ResourceTaggingWidget( QWidget* parent )
 101     : QWidget( parent ),
 102       d( new Private() )
 103 {
 104     QVBoxLayout* layout = new QVBoxLayout( this );
 105     layout->setMargin( 0 );
 106     d->resourceTagCloud = new TagCloud( this );
 107     layout->addWidget( d->resourceTagCloud );
 108     QLabel* changeTagsLabel = new QLabel( "<p align=center><a style=\"font-size:small;\" href=\"dummy\">" + i18n( "Change tags..." ) + "</a>", this );
 109     connect( changeTagsLabel, SIGNAL( linkActivated( const QString ) ),
 110              this, SLOT( _k_slotShowTaggingPopup() ) );
 111     layout->addWidget( changeTagsLabel );
 112
 113     // the popup tag cloud
 114     d->popup = new TaggingPopup;
 115     d->popup->setSelectionEnabled( true );
 116     d->popup->setNewTagButtonEnabled( true );
 117
 118     connect( d->popup, SIGNAL( tagToggled( const Nepomuk::Tag&, bool ) ),
 119              this, SLOT( slotTagToggled( const Nepomuk::Tag&, bool ) ) );
 120     connect( d->popup, SIGNAL( tagAdded( const Nepomuk::Tag& ) ),
 121              this, SLOT( slotTagAdded( const Nepomuk::Tag& ) ) );
 122
 123     connect( d->resourceTagCloud, SIGNAL( tagClicked( const Nepomuk::Tag& ) ),
 124              this, SIGNAL( tagClicked( const Nepomuk::Tag& ) ) );
 125 }
 126
 127
 128 Nepomuk::ResourceTaggingWidget::~ResourceTaggingWidget()
 129 {
 130     delete d->popup;
 131     delete d;
 132 }
 133
 134
 135 void Nepomuk::ResourceTaggingWidget::setResource( const Nepomuk::Resource& res )
 136 {
 137     setResources( QList<Resource>() << res );
 138 }
 139
 140
 141 void Nepomuk::ResourceTaggingWidget::setResources( const QList<Nepomuk::Resource>& resList )
 142 {
 143     d->resources = resList;
 144     d->resourceTagCloud->showTags( d->intersectTags( resList ) );
 145 }
 146
 147
 148 void Nepomuk::ResourceTaggingWidget::slotTagToggled( const Nepomuk::Tag& tag, bool enabled )
 149 {
 150     if ( enabled ) {
 151         d->resourceTags.append( tag );
 152     }
 153     else {
 154         d->resourceTags.removeAll( tag );
 155     }
 156     d->popup->hide();
 157 }
 158
 159
 160 void Nepomuk::ResourceTaggingWidget::slotTagAdded( const Nepomuk::Tag& tag )
 161 {
 162     // assign it right away
 163     d->resourceTags.append( tag );
 164 //    d->resource.addTag( tag );
 165 }
 166
 167
 168 void Nepomuk::ResourceTaggingWidget::contextMenuEvent( QContextMenuEvent* e )
 169 {
 170     d->showTaggingPopup( e->globalPos() );
 171 }
 172
 173 #include "resourcetaggingwidget.moc"