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f5050913b7
in the original KDE implementation it was used along with Nepomuk, but Nepomuk support was dropped yet some semantic URIs are still used across the KDE applications (e.g. dolphin, gwenview) for info other than size, date of modification, etc. thus keeping a local static mini-hash for the kfileitem properties is not very good as knfotranslator has its own hash mechanisms thus the translator items got merged into the translator and is now fully utilized hopefully dropping the memory usage a little bit of the metadata provider.
316 lines
10 KiB
C++
316 lines
10 KiB
C++
/*****************************************************************************
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* Copyright (C) 2010 by Peter Penz <peter.penz@gmx.at> *
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* *
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* This library is free software; you can redistribute it and/or *
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* modify it under the terms of the GNU Library General Public *
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* License as published by the Free Software Foundation; either *
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* version 2 of the License, or (at your option) any later version. *
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* *
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* This library is distributed in the hope that it will be useful, *
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* but WITHOUT ANY WARRANTY; without even the implied warranty of *
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU *
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* Library General Public License for more details. *
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* *
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* You should have received a copy of the GNU Library General Public License *
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* along with this library; see the file COPYING.LIB. If not, write to *
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* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, *
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* Boston, MA 02110-1301, USA. *
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*****************************************************************************/
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#include "kfilemetadataprovider_p.h"
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#include <kfileitem.h>
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#include <kfilemetadatareader_p.h>
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#include <knfotranslator_p.h>
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#include <klocale.h>
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#include <kstandarddirs.h>
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#include <kurl.h>
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#include <QLabel>
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#include <QDir>
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namespace {
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static QString plainText(const QString& richText)
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{
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QString plainText;
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plainText.reserve(richText.length());
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bool skip = false;
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for (int i = 0; i < richText.length(); ++i) {
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const QChar c = richText.at(i);
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if (c == QLatin1Char('<')) {
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skip = true;
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} else if (c == QLatin1Char('>')) {
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skip = false;
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} else if (!skip) {
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plainText.append(c);
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}
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}
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return plainText;
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}
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}
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// The default size hint of QLabel tries to return a square size.
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// This does not work well in combination with layouts that use
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// heightForWidth(): In this case it is possible that the content
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// of a label might get clipped. By specifying a size hint
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// with a maximum width that is necessary to contain the whole text,
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// using heightForWidth() assures having a non-clipped text.
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class ValueWidget : public QLabel
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{
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public:
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explicit ValueWidget(QWidget* parent = 0);
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virtual QSize sizeHint() const;
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};
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ValueWidget::ValueWidget(QWidget* parent) :
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QLabel(parent)
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{
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}
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QSize ValueWidget::sizeHint() const
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{
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QFontMetrics metrics(font());
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// TODO: QLabel internally provides already a method sizeForWidth(),
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// that would be sufficient. However this method is not accessible, so
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// as workaround the tags from a richtext are removed manually here to
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// have a proper size hint.
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return metrics.size(Qt::TextSingleLine, plainText(text()));
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}
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class KFileMetaDataProvider::Private
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{
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public:
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Private(KFileMetaDataProvider* parent);
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~Private();
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void slotLoadingFinished();
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void slotMetaDataUpdateDone();
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void slotLinkActivated(const QString& link);
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/**
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* Disables the metadata widget and starts the job that
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* changes the meta data asynchronously. After the job
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* has been finished, the metadata widget gets enabled again.
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*/
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void startChangeDataJob(KJob* job);
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QList<QString> resourceList() const;
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QWidget* createValueWidget(const QString& value, QWidget* parent);
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/*
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* @return The number of subdirectories for the directory \a path.
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*/
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static int subDirectoriesCount(const QString &path);
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QList<KFileItem> m_fileItems;
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QHash<KUrl, QVariant> m_data;
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QList<KFileMetaDataReader*> m_metaDataReaders;
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KFileMetaDataReader* m_latestMetaDataReader;
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private:
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KFileMetaDataProvider* const q;
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};
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KFileMetaDataProvider::Private::Private(KFileMetaDataProvider* parent) :
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m_fileItems(),
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m_data(),
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m_metaDataReaders(),
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m_latestMetaDataReader(0),
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q(parent)
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{
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}
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KFileMetaDataProvider::Private::~Private()
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{
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qDeleteAll(m_metaDataReaders);
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}
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void KFileMetaDataProvider::Private::slotLoadingFinished()
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{
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KFileMetaDataReader* finishedMetaDataReader = qobject_cast<KFileMetaDataReader*>(q->sender());
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// The process that has emitted the finished() signal
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// will get deleted and removed from m_metaDataReaders.
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for (int i = 0; i < m_metaDataReaders.count(); ++i) {
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KFileMetaDataReader* metaDataReader = m_metaDataReaders[i];
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if (metaDataReader == finishedMetaDataReader) {
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m_metaDataReaders.removeAt(i);
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if (metaDataReader != m_latestMetaDataReader) {
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// Ignore data of older processs, as the data got
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// obsolete by m_latestMetaDataReader.
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metaDataReader->deleteLater();
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return;
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}
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}
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}
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m_data = m_latestMetaDataReader->metaData();
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m_latestMetaDataReader->deleteLater();
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if (m_fileItems.count() == 1) {
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// TODO: Handle case if remote URLs are used properly. isDir() does
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// not work, the modification date needs also to be adjusted...
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const KFileItem& item = m_fileItems.first();
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if (item.isDir()) {
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const int count = subDirectoriesCount(item.url().pathOrUrl());
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if (count == -1) {
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m_data.insert(KUrl("kfileitem#size"), QString("Unknown"));
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} else {
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const QString itemCountString = i18ncp("@item:intable", "%1 item", "%1 items", count);
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m_data.insert(KUrl("kfileitem#size"), itemCountString);
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}
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} else {
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m_data.insert(KUrl("kfileitem#size"), KIO::convertSize(item.size()));
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}
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m_data.insert(KUrl("kfileitem#type"), item.mimeComment());
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m_data.insert(KUrl("kfileitem#modified"), KGlobal::locale()->formatDateTime(item.time(KFileItem::ModificationTime), KLocale::FancyLongDate));
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m_data.insert(KUrl("kfileitem#owner"), item.user());
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m_data.insert(KUrl("kfileitem#permissions"), item.permissionsString());
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} else if (m_fileItems.count() > 1) {
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// Calculate the size of all items
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quint64 totalSize = 0;
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foreach (const KFileItem& item, m_fileItems) {
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if (!item.isDir() && !item.isLink()) {
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totalSize += item.size();
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}
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}
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m_data.insert(KUrl("kfileitem#totalSize"), KIO::convertSize(totalSize));
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}
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emit q->loadingFinished();
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}
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void KFileMetaDataProvider::Private::slotLinkActivated(const QString& link)
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{
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emit q->urlActivated(KUrl(link));
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}
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void KFileMetaDataProvider::Private::startChangeDataJob(KJob* job)
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{
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connect(job, SIGNAL(result(KJob*)),
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q, SIGNAL(dataChangeFinished()));
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emit q->dataChangeStarted();
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job->start();
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}
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QList<QString> KFileMetaDataProvider::Private::resourceList() const
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{
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QList<QString> list;
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foreach (const KFileItem& item, m_fileItems) {
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const KUrl url = item.url();
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if(url.isValid())
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list.append(url.prettyUrl());
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}
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return list;
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}
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QWidget* KFileMetaDataProvider::Private::createValueWidget(const QString& value, QWidget* parent)
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{
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ValueWidget* valueWidget = new ValueWidget(parent);
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valueWidget->setWordWrap(true);
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valueWidget->setAlignment(Qt::AlignTop | Qt::AlignLeft);
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valueWidget->setText(plainText(value));
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connect(valueWidget, SIGNAL(linkActivated(QString)), q, SLOT(slotLinkActivated(QString)));
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return valueWidget;
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}
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KFileMetaDataProvider::KFileMetaDataProvider(QObject* parent) :
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QObject(parent),
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d(new Private(this))
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{
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}
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KFileMetaDataProvider::~KFileMetaDataProvider()
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{
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delete d;
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}
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void KFileMetaDataProvider::setItems(const KFileItemList& items)
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{
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d->m_fileItems = items;
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if (items.isEmpty()) {
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return;
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}
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Q_PRIVATE_SLOT(d,void slotDataChangeStarted())
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Q_PRIVATE_SLOT(d,void slotDataChangeFinished())
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QList<KUrl> urls;
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foreach (const KFileItem& item, items) {
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const KUrl url = item.url();
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if (url.isValid()) {
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urls.append(url);
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}
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}
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d->m_latestMetaDataReader = new KFileMetaDataReader(urls);
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d->m_latestMetaDataReader->setReadContextData(false);
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connect(d->m_latestMetaDataReader, SIGNAL(finished()), this, SLOT(slotLoadingFinished()));
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d->m_metaDataReaders.append(d->m_latestMetaDataReader);
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d->m_latestMetaDataReader->start();
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}
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QString KFileMetaDataProvider::label(const KUrl& metaDataUri) const
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{
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return KNfoTranslator::instance().translation(metaDataUri.url());
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}
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QString KFileMetaDataProvider::group(const KUrl& metaDataUri) const
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{
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QString group; // return value
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const QString uri = metaDataUri.url();
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if (uri == QLatin1String("kfileitem#type")) {
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group = QLatin1String("0FileItemA");
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} else if (uri == QLatin1String("kfileitem#size")) {
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group = QLatin1String("0FileItemB");
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} else if (uri == QLatin1String("http://www.semanticdesktop.org/ontologies/2007/03/22/nfo#width")) {
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group = QLatin1String("0SizeA");
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} else if (uri == QLatin1String("http://www.semanticdesktop.org/ontologies/2007/03/22/nfo#height")) {
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group = QLatin1String("0SizeB");
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}
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return group;
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}
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KFileItemList KFileMetaDataProvider::items() const
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{
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return d->m_fileItems;
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}
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QHash<KUrl, QVariant> KFileMetaDataProvider::data() const
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{
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return d->m_data;
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}
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QWidget* KFileMetaDataProvider::createValueWidget(const KUrl& metaDataUri,
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const QVariant& value,
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QWidget* parent) const
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{
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Q_ASSERT(parent != 0);
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QWidget* widget = 0;
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if (widget == 0) {
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widget = d->createValueWidget(value.toString(), parent);
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}
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widget->setForegroundRole(parent->foregroundRole());
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widget->setFont(parent->font());
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return widget;
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}
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int KFileMetaDataProvider::Private::subDirectoriesCount(const QString& path)
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{
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QDir dir(path);
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return dir.entryList(QDir::AllEntries|QDir::NoDotAndDotDot|QDir::System).count();
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}
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#include "moc_kfilemetadataprovider_p.cpp"
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