File indexing completed on 2024-05-05 16:08:26

 /*****************************************************************************
  * Copyright (C) 2008-2010 by Sebastian Trueg <trueg@kde.org>                *
  * Copyright (C) 2009-2010 by Peter Penz <peter.penz@gmx.at>                 *
  *                                                                           *
  * This library is free software; you can redistribute it and/or             *
  * modify it under the terms of the GNU Library 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         *
  * Library General Public License for more details.                          *
  *                                                                           *
  * You should have received a copy of the GNU Library General Public License *
  * along with this library; see the file COPYING.LIB.  If not, write to      *
  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,      *
  * Boston, MA 02110-1301, USA.                                               *
  *****************************************************************************/
 
 #include "kfilemetadatawidget.h"
 
 #include <kconfig.h>
 #include <kconfiggroup.h>
 #include <klocalizedstring.h>
 
 #include <QGridLayout>
 #include <QLabel>
 #include <QSet>
 #include <QString>
 #include <QTimer>
 
 #include <config-kdelibs4support.h>
 #if ! KIO_NO_NEPOMUK
 #define DISABLE_NEPOMUK_LEGACY
 
 #include <property.h>
 #include <tag.h>
 
 #include <QSpacerItem>
 
 #include "kfilemetadataprovider_p.h"
 #endif
 
 class Q_DECL_HIDDEN KFileMetaDataWidget::Private
 {
 public:
     struct Row {
         QLabel *label;
         QWidget *value;
     };
 
     Private(KFileMetaDataWidget *parent);
     ~Private();
 
     /**
      * Initializes the configuration file "kmetainformationrc"
      * with proper default settings for the first start in
      * an uninitialized environment.
      */
     void initMetaInfoSettings();
 
     /**
      * Parses the configuration file "kmetainformationrc" and
      * updates the visibility of all rows that got their data
      * from KFileItem.
      */
     void updateFileItemRowsVisibility();
 
     void deleteRows();
 
     void slotLoadingFinished();
     void slotLinkActivated(const QString &link);
     void slotDataChangeStarted();
     void slotDataChangeFinished();
 
 #if ! KIO_NO_NEPOMUK
     QList<QUrl> sortedKeys(const QHash<QUrl, Nepomuk::Variant> &data) const;
 
     /**
      * @return True, if at least one of the file items \a m_fileItems has
      *         a valid Nepomuk URI.
      */
     bool hasNepomukUris() const;
 #endif
 
     QList<Row> m_rows;
 #if ! KIO_NO_NEPOMUK
     KFileMetaDataProvider *m_provider;
 #endif
     QGridLayout *m_gridLayout;
 
 private:
     KFileMetaDataWidget *const q;
 };
 
 KFileMetaDataWidget::Private::Private(KFileMetaDataWidget *parent) :
     m_rows(),
 #if ! KIO_NO_NEPOMUK
     m_provider(0),
 #endif
     m_gridLayout(nullptr),
     q(parent)
 {
     initMetaInfoSettings();
 
 #if ! KIO_NO_NEPOMUK
     // TODO: If KFileMetaDataProvider might get a public class in future KDE releases,
     // the following code should be moved into KFileMetaDataWidget::setModel():
     m_provider = new KFileMetaDataProvider(q);
     connect(m_provider, SIGNAL(loadingFinished()), q, SLOT(slotLoadingFinished()));
     connect(m_provider, SIGNAL(urlActivated(QUrl)), q, SIGNAL(urlActivated(QUrl)));
 #endif
 }
 
 KFileMetaDataWidget::Private::~Private()
 {
 }
 
 void KFileMetaDataWidget::Private::initMetaInfoSettings()
 {
     const int currentVersion = 3; // increase version, if the blacklist of disabled
     // properties should be updated
 
     KConfig config("kmetainformationrc", KConfig::NoGlobals);
     if (config.group("Misc").readEntry("version", 0) < currentVersion) {
         // The resource file is read the first time. Assure
         // that some meta information is disabled per default.
 
         // clear old info
         config.deleteGroup("Show");
         KConfigGroup settings = config.group("Show");
 
         static const char *const disabledProperties[] = {
             "http://www.semanticdesktop.org/ontologies/2007/01/19/nie#comment",
             "http://www.semanticdesktop.org/ontologies/2007/01/19/nie#contentSize",
             "http://www.semanticdesktop.org/ontologies/2007/01/19/nie#depends",
             "http://www.semanticdesktop.org/ontologies/2007/01/19/nie#isPartOf",
             "http://www.semanticdesktop.org/ontologies/2007/01/19/nie#lastModified",
             "http://www.semanticdesktop.org/ontologies/2007/01/19/nie#mimeType",
             "http://www.semanticdesktop.org/ontologies/2007/01/19/nie#plainTextContent",
             "http://www.semanticdesktop.org/ontologies/2007/01/19/nie#url",
             "http://www.semanticdesktop.org/ontologies/2007/03/22/nfo#averageBitrate",
             "http://www.semanticdesktop.org/ontologies/2007/03/22/nfo#channels",
             "http://www.semanticdesktop.org/ontologies/2007/03/22/nfo#fileName",
             "http://www.semanticdesktop.org/ontologies/2007/05/10/nexif#apertureValue",
             "http://www.semanticdesktop.org/ontologies/2007/05/10/nexif#exposureBiasValue",
             "http://www.semanticdesktop.org/ontologies/2007/05/10/nexif#exposureTime",
             "http://www.semanticdesktop.org/ontologies/2007/05/10/nexif#flash",
             "http://www.semanticdesktop.org/ontologies/2007/05/10/nexif#focalLength",
             "http://www.semanticdesktop.org/ontologies/2007/05/10/nexif#focalLengthIn35mmFilm",
             "http://www.semanticdesktop.org/ontologies/2007/05/10/nexif#isoSpeedRatings",
             "http://www.semanticdesktop.org/ontologies/2007/05/10/nexif#make",
             "http://www.semanticdesktop.org/ontologies/2007/05/10/nexif#meteringMode",
             "http://www.semanticdesktop.org/ontologies/2007/05/10/nexif#model",
             "http://www.semanticdesktop.org/ontologies/2007/05/10/nexif#orientation",
             "http://www.semanticdesktop.org/ontologies/2007/05/10/nexif#whiteBalance",
             "http://www.semanticdesktop.org/ontologies/2007/08/15/nao#description",
             "http://www.semanticdesktop.org/ontologies/2007/08/15/nao#hasTag",
             "http://www.semanticdesktop.org/ontologies/2007/08/15/nao#lastModified",
             "http://www.semanticdesktop.org/ontologies/2007/08/15/nao#numericRating",
             "http://www.w3.org/1999/02/22-rdf-syntax-ns#type",
             "kfileitem#owner",
             "kfileitem#permissions",
             nullptr // mandatory last entry
         };
 
         for (int i = 0; disabledProperties[i] != nullptr; ++i) {
             settings.writeEntry(disabledProperties[i], false);
         }
 
         // mark the group as initialized
         config.group("Misc").writeEntry("version", currentVersion);
     }
 }
 
 void KFileMetaDataWidget::Private::deleteRows()
 {
     foreach (const Row &row, m_rows) {
         delete row.label;
         delete row.value;
     }
     m_rows.clear();
 }
 
 void KFileMetaDataWidget::Private::slotLoadingFinished()
 {
 #if ! KIO_NO_NEPOMUK
     deleteRows();
 
     if (!hasNepomukUris()) {
         q->updateGeometry();
         emit q->metaDataRequestFinished(m_provider->items());
         return;
     }
 
     if (m_gridLayout == 0) {
         m_gridLayout = new QGridLayout(q);
         m_gridLayout->setContentsMargins(0, 0, 0, 0);
         m_gridLayout->setSpacing(q->fontMetrics().height() / 4);
     }
 
     QHash<QUrl, Nepomuk::Variant> data = m_provider->data();
 
     // Remove all items, that are marked as hidden in kmetainformationrc
     KConfig config("kmetainformationrc", KConfig::NoGlobals);
     KConfigGroup settings = config.group("Show");
     QHash<QUrl, Nepomuk::Variant>::iterator it = data.begin();
     while (it != data.end()) {
         const QString uriString = it.key().url();
         if (!settings.readEntry(uriString, true) ||
                 !Nepomuk::Types::Property(it.key()).userVisible()) {
             it = data.erase(it);
         } else {
             ++it;
         }
     }
 
     // Iterate through all remaining items embed the label
     // and the value as new row in the widget
     int rowIndex = 0;
     const QList<QUrl> keys = sortedKeys(data);
     foreach (const QUrl &key, keys) {
         const Nepomuk::Variant value = data[key];
         QString itemLabel = m_provider->label(key);
         itemLabel.append(QLatin1Char(':'));
 
         // Create label
         QLabel *label = new QLabel(itemLabel, q);
         label->setSizePolicy(QSizePolicy::MinimumExpanding, QSizePolicy::Preferred);
         label->setForegroundRole(q->foregroundRole());
         label->setFont(q->font());
         label->setWordWrap(true);
         label->setAlignment(Qt::AlignTop | Qt::AlignRight);
 
         // Create value-widget
         QWidget *valueWidget = m_provider->createValueWidget(key, value, q);
 
         // Add the label and value-widget to grid layout
         m_gridLayout->addWidget(label, rowIndex, 0, Qt::AlignRight);
         const int spacerWidth = QFontMetrics(q->font()).size(Qt::TextSingleLine, " ").width();
         m_gridLayout->addItem(new QSpacerItem(spacerWidth, 1), rowIndex, 1);
         m_gridLayout->addWidget(valueWidget, rowIndex, 2, Qt::AlignLeft);
 
         // Remember the label and value-widget as row
         Row row;
         row.label = label;
         row.value = valueWidget;
         m_rows.append(row);
 
         ++rowIndex;
     }
 #endif
 
     q->updateGeometry();
 #if ! KIO_NO_NEPOMUK
     emit q->metaDataRequestFinished(m_provider->items());
 #endif
 }
 
 void KFileMetaDataWidget::Private::slotLinkActivated(const QString &link)
 {
     const QUrl url(link);
     if (url.isValid()) {
         emit q->urlActivated(url);
     }
 }
 
 void KFileMetaDataWidget::Private::slotDataChangeStarted()
 {
     q->setEnabled(false);
 }
 
 void KFileMetaDataWidget::Private::slotDataChangeFinished()
 {
     q->setEnabled(true);
 }
 
 #if ! KIO_NO_NEPOMUK
 QList<QUrl> KFileMetaDataWidget::Private::sortedKeys(const QHash<QUrl, Nepomuk::Variant> &data) const
 {
     // Create a map, where the translated label prefixed with the
     // sort priority acts as key. The data of each entry is the URI
     // of the data. By this the all URIs are sorted by the sort priority
     // and sub sorted by the translated labels.
     QMap<QString, QUrl> map;
     QHash<QUrl, Nepomuk::Variant>::const_iterator hashIt = data.constBegin();
     while (hashIt != data.constEnd()) {
         const QUrl uri = hashIt.key();
 
         QString key = m_provider->group(uri);
         key += m_provider->label(uri);
 
         map.insert(key, uri);
         ++hashIt;
     }
 
     // Apply the URIs from the map to the list that will get returned.
     // The list will then be alphabetically ordered by the translated labels of the URIs.
     QList<QUrl> list;
     QMap<QString, QUrl>::const_iterator mapIt = map.constBegin();
     while (mapIt != map.constEnd()) {
         list.append(mapIt.value());
         ++mapIt;
     }
 
     return list;
 }
 
 bool KFileMetaDataWidget::Private::hasNepomukUris() const
 {
     foreach (const KFileItem &fileItem, m_provider->items()) {
         if (fileItem.nepomukUri().isValid()) {
             return true;
         }
     }
     return false;
 }
 #endif
 
 KFileMetaDataWidget::KFileMetaDataWidget(QWidget *parent) :
     QWidget(parent),
     d(new Private(this))
 {
 }
 
 KFileMetaDataWidget::~KFileMetaDataWidget()
 {
     delete d;
 }
 
 void KFileMetaDataWidget::setItems(const KFileItemList &items)
 {
 #if KIO_NO_NEPOMUK
     Q_UNUSED(items)
 #else
     d->m_provider->setItems(items);
 #endif
 }
 
 KFileItemList KFileMetaDataWidget::items() const
 {
 #if ! KIO_NO_NEPOMUK
     return d->m_provider->items();
 #else
     return KFileItemList();
 #endif
 }
 
 void KFileMetaDataWidget::setReadOnly(bool readOnly)
 {
 #if KIO_NO_NEPOMUK
     Q_UNUSED(readOnly)
 #else
     d->m_provider->setReadOnly(readOnly);
 #endif
 }
 
 bool KFileMetaDataWidget::isReadOnly() const
 {
 #if ! KIO_NO_NEPOMUK
     return d->m_provider->isReadOnly();
 #else
     return true;
 #endif
 }
 
 QSize KFileMetaDataWidget::sizeHint() const
 {
     if (d->m_gridLayout == nullptr) {
         return QWidget::sizeHint();
     }
 
     // Calculate the required width for the labels and values
     int leftWidthMax = 0;
     int rightWidthMax = 0;
     int rightWidthAverage = 0;
     foreach (const Private::Row &row, d->m_rows) {
         const QWidget *valueWidget = row.value;
         const int rightWidth = valueWidget->sizeHint().width();
         rightWidthAverage += rightWidth;
         if (rightWidth > rightWidthMax) {
             rightWidthMax = rightWidth;
         }
 
         const int leftWidth = row.label->sizeHint().width();
         if (leftWidth > leftWidthMax) {
             leftWidthMax = leftWidth;
         }
     }
 
     // Some value widgets might return a very huge width for the size hint.
     // Limit the maximum width to the double width of the overall average
     // to assure a less messed layout.
     if (d->m_rows.count() > 1) {
         rightWidthAverage /= d->m_rows.count();
         if (rightWidthMax > rightWidthAverage * 2) {
             rightWidthMax = rightWidthAverage * 2;
         }
     }
 
     // Based on the available width calculate the required height
     int height = d->m_gridLayout->margin() * 2 + d->m_gridLayout->spacing() * (d->m_rows.count() - 1);
     foreach (const Private::Row &row, d->m_rows) {
         const QWidget *valueWidget = row.value;
         const int rowHeight = qMax(row.label->heightForWidth(leftWidthMax),
                                    valueWidget->heightForWidth(rightWidthMax));
         height += rowHeight;
     }
 
     const int width = d->m_gridLayout->margin() * 2 + leftWidthMax +
                       d->m_gridLayout->spacing() + rightWidthMax;
 
     return QSize(width, height);
 }
 
 bool KFileMetaDataWidget::event(QEvent *event)
 {
     return QWidget::event(event);
 }
 
 #include "moc_kfilemetadatawidget.cpp"