src/panels/information/informationpanelcontent.cpp

   1 /***************************************************************************
   2  *   Copyright (C) 2009 by Peter Penz <peter.penz19@gmail.com>             *
   3  *                                                                         *
   4  *   This program is free software; you can redistribute it and/or modify  *
   5  *   it under the terms of the GNU General Public License as published by  *
   6  *   the Free Software Foundation; either version 2 of the License, or     *
   7  *   (at your option) any later version.                                   *
   8  *                                                                         *
   9  *   This program 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         *
  12  *   GNU General Public License for more details.                          *
  13  *                                                                         *
  14  *   You should have received a copy of the GNU General Public License     *
  15  *   along with this program; if not, write to the                         *
  16  *   Free Software Foundation, Inc.,                                       *
  17  *   51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA            *
  18  ***************************************************************************/
  19
  20 #include "informationpanelcontent.h"
  21
  22 #include <KFileItem>
  23 #include <KIO/JobUiDelegate>
  24 #include <KIO/PreviewJob>
  25 #include <KJobWidgets>
  26 #include <KIconEffect>
  27 #include <KIconLoader>
  28 #include <QIcon>
  29 #include <KLocalizedString>
  30 #include <QMenu>
  31 #include <KSeparator>
  32 #include <KStringHandler>
  33 #include <QTextDocument>
  34
  35 #ifndef HAVE_BALOO
  36 #include <KFileMetaDataWidget>
  37 #else
  38 #include <Baloo/FileMetaDataWidget>
  39 #endif
  40
  41 #include <panels/places/placesitem.h>
  42 #include <panels/places/placesitemmodel.h>
  43
  44 #include <Phonon/BackendCapabilities>
  45 #include <Phonon/MediaObject>
  46 #include <Phonon/SeekSlider>
  47
  48 #include <QEvent>
  49 #include <QLabel>
  50 #include <QPixmap>
  51 #include <QResizeEvent>
  52 #include <QScrollArea>
  53 #include <QTextLayout>
  54 #include <QTextLine>
  55 #include <QTimer>
  56 #include <QVBoxLayout>
  57 #include <QFontDatabase>
  58 #include <QStyle>
  59
  60 #include "dolphin_informationpanelsettings.h"
  61 #include "filemetadataconfigurationdialog.h"
  62 #include "phononwidget.h"
  63 #include "pixmapviewer.h"
  64
  65 InformationPanelContent::InformationPanelContent(QWidget* parent) :
  66     QWidget(parent),
  67     m_item(),
  68     m_previewJob(0),
  69     m_outdatedPreviewTimer(0),
  70     m_preview(0),
  71     m_phononWidget(0),
  72     m_nameLabel(0),
  73     m_metaDataWidget(0),
  74     m_metaDataArea(0),
  75     m_placesItemModel(0)
  76 {
  77     parent->installEventFilter(this);
  78
  79     // Initialize timer for disabling an outdated preview with a small
  80     // delay. This prevents flickering if the new preview can be generated
  81     // within a very small timeframe.
  82     m_outdatedPreviewTimer = new QTimer(this);
  83     m_outdatedPreviewTimer->setInterval(300);
  84     m_outdatedPreviewTimer->setSingleShot(true);
  85     connect(m_outdatedPreviewTimer, &QTimer::timeout,
  86             this, &InformationPanelContent::markOutdatedPreview);
  87
  88     QVBoxLayout* layout = new QVBoxLayout(this);
  89
  90     // preview
  91     const int minPreviewWidth = KIconLoader::SizeEnormous + KIconLoader::SizeMedium;
  92
  93     m_preview = new PixmapViewer(parent);
  94     m_preview->setMinimumWidth(minPreviewWidth);
  95     m_preview->setMinimumHeight(KIconLoader::SizeEnormous);
  96
  97     m_phononWidget = new PhononWidget(parent);
  98     m_phononWidget->hide();
  99     m_phononWidget->setMinimumWidth(minPreviewWidth);
 100     connect(m_phononWidget, &PhononWidget::hasVideoChanged,
 101             this, &InformationPanelContent::slotHasVideoChanged);
 102
 103     // name
 104     m_nameLabel = new QLabel(parent);
 105     QFont font = m_nameLabel->font();
 106     font.setBold(true);
 107     m_nameLabel->setFont(font);
 108     m_nameLabel->setTextFormat(Qt::PlainText);
 109     m_nameLabel->setAlignment(Qt::AlignHCenter);
 110     m_nameLabel->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Fixed);
 111
 112     const bool previewsShown = InformationPanelSettings::previewsShown();
 113     m_preview->setVisible(previewsShown);
 114
 115 #ifndef HAVE_BALOO
 116     m_metaDataWidget = new KFileMetaDataWidget(parent);
 117     connect(m_metaDataWidget, &KFileMetaDataWidget::urlActivated,
 118             this, &InformationPanelContent::urlActivated);
 119 #else
 120     m_metaDataWidget = new Baloo::FileMetaDataWidget(parent);
 121     connect(m_metaDataWidget, &Baloo::FileMetaDataWidget::urlActivated,
 122             this, &InformationPanelContent::urlActivated);
 123 #endif
 124     m_metaDataWidget->setFont(QFontDatabase::systemFont(QFontDatabase::SmallestReadableFont));
 125     m_metaDataWidget->setSizePolicy(QSizePolicy::Preferred, QSizePolicy::Minimum);
 126
 127     // Encapsulate the MetaDataWidget inside a container that has a dummy widget
 128     // at the bottom. This prevents that the meta data widget gets vertically stretched
 129     // in the case where the height of m_metaDataArea > m_metaDataWidget.
 130     QWidget* metaDataWidgetContainer = new QWidget(parent);
 131     QVBoxLayout* containerLayout = new QVBoxLayout(metaDataWidgetContainer);
 132     containerLayout->setContentsMargins(0, 0, 0, 0);
 133     containerLayout->setSpacing(0);
 134     containerLayout->addWidget(m_metaDataWidget);
 135     containerLayout->addStretch();
 136
 137     m_metaDataArea = new QScrollArea(parent);
 138     m_metaDataArea->setWidget(metaDataWidgetContainer);
 139     m_metaDataArea->setWidgetResizable(true);
 140     m_metaDataArea->setFrameShape(QFrame::NoFrame);
 141
 142     QWidget* viewport = m_metaDataArea->viewport();
 143     viewport->installEventFilter(this);
 144
 145     layout->addWidget(m_preview);
 146     layout->addWidget(m_phononWidget);
 147     layout->addWidget(m_nameLabel);
 148     layout->addWidget(new KSeparator());
 149     layout->addWidget(m_metaDataArea);
 150
 151     m_placesItemModel = new PlacesItemModel(this);
 152 }
 153
 154 InformationPanelContent::~InformationPanelContent()
 155 {
 156     InformationPanelSettings::self()->save();
 157 }
 158
 159 void InformationPanelContent::showItem(const KFileItem& item)
 160 {
 161     // If there is a preview job, kill it to prevent that we have jobs for
 162     // multiple items running, and thus a race condition (bug 250787).
 163     if (m_previewJob) {
 164         m_previewJob->kill();
 165     }
 166
 167     const QUrl itemUrl = item.url();
 168     const bool isSearchUrl = itemUrl.scheme().contains(QStringLiteral("search")) && item.localPath().isEmpty();
 169     if (!applyPlace(itemUrl)) {
 170         setNameLabelText(item.text());
 171         if (isSearchUrl) {
 172             // in the case of a search-URL the URL is not readable for humans
 173             // (at least not useful to show in the Information Panel)
 174             KIconLoader iconLoader;
 175             QPixmap icon = iconLoader.loadIcon(QStringLiteral("nepomuk"),
 176                                                KIconLoader::NoGroup,
 177                                                KIconLoader::SizeEnormous);
 178             m_preview->setPixmap(icon);
 179         } else {
 180             // try to get a preview pixmap from the item...
 181
 182             // Mark the currently shown preview as outdated. This is done
 183             // with a small delay to prevent a flickering when the next preview
 184             // can be shown within a short timeframe. This timer is not started
 185             // for directories, as directory previews might fail and return the
 186             // same icon.
 187             if (!item.isDir()) {
 188                 m_outdatedPreviewTimer->start();
 189             }
 190
 191             m_previewJob = new KIO::PreviewJob(KFileItemList() << item, QSize(m_preview->width(), m_preview->height()));
 192             m_previewJob->setScaleType(KIO::PreviewJob::Unscaled);
 193             m_previewJob->setIgnoreMaximumSize(item.isLocalFile());
 194             if (m_previewJob->ui()) {
 195                 KJobWidgets::setWindow(m_previewJob, this);
 196             }
 197
 198             connect(m_previewJob.data(), &KIO::PreviewJob::gotPreview,
 199                     this, &InformationPanelContent::showPreview);
 200             connect(m_previewJob.data(), &KIO::PreviewJob::failed,
 201                     this, &InformationPanelContent::showIcon);
 202         }
 203     }
 204
 205     if (m_metaDataWidget) {
 206         m_metaDataWidget->show();
 207         m_metaDataWidget->setItems(KFileItemList() << item);
 208     }
 209
 210     if (InformationPanelSettings::previewsShown()) {
 211         const QString mimeType = item.mimetype();
 212         const bool usePhonon = mimeType.startsWith(QLatin1String("audio/")) || mimeType.startsWith(QLatin1String("video/"));
 213         if (usePhonon) {
 214             m_phononWidget->show();
 215             m_phononWidget->setUrl(item.targetUrl());
 216             if (m_preview->isVisible()) {
 217                 m_phononWidget->setVideoSize(m_preview->size());
 218             }
 219         } else {
 220             m_phononWidget->hide();
 221             m_preview->setVisible(true);
 222         }
 223     } else {
 224         m_phononWidget->hide();
 225     }
 226
 227     m_item = item;
 228 }
 229
 230 void InformationPanelContent::showItems(const KFileItemList& items)
 231 {
 232     // If there is a preview job, kill it to prevent that we have jobs for
 233     // multiple items running, and thus a race condition (bug 250787).
 234     if (m_previewJob) {
 235         m_previewJob->kill();
 236     }
 237
 238     KIconLoader iconLoader;
 239     QPixmap icon = iconLoader.loadIcon(QStringLiteral("dialog-information"),
 240                                        KIconLoader::NoGroup,
 241                                        KIconLoader::SizeEnormous);
 242     m_preview->setPixmap(icon);
 243     setNameLabelText(i18ncp("@label", "%1 item selected", "%1 items selected", items.count()));
 244
 245     if (m_metaDataWidget) {
 246         m_metaDataWidget->setItems(items);
 247     }
 248
 249     m_phononWidget->hide();
 250
 251     m_item = KFileItem();
 252 }
 253
 254 bool InformationPanelContent::eventFilter(QObject* obj, QEvent* event)
 255 {
 256     switch (event->type()) {
 257     case QEvent::Resize: {
 258         QResizeEvent* resizeEvent = static_cast<QResizeEvent*>(event);
 259         if (obj == m_metaDataArea->viewport()) {
 260             // The size of the meta text area has changed. Adjust the fixed
 261             // width in a way that no horizontal scrollbar needs to be shown.
 262             m_metaDataWidget->setFixedWidth(resizeEvent->size().width());
 263         } else if (obj == parent()) {
 264             adjustWidgetSizes(resizeEvent->size().width());
 265         }
 266         break;
 267     }
 268
 269     case QEvent::Polish:
 270         adjustWidgetSizes(parentWidget()->width());
 271         break;
 272
 273     case QEvent::FontChange:
 274         m_metaDataWidget->setFont(QFontDatabase::systemFont(QFontDatabase::SmallestReadableFont));
 275         break;
 276
 277     default:
 278         break;
 279     }
 280
 281     return QWidget::eventFilter(obj, event);
 282 }
 283
 284 void InformationPanelContent::configureSettings(const QList<QAction*>& customContextMenuActions)
 285 {
 286     QMenu popup(this);
 287
 288     QAction* previewAction = popup.addAction(i18nc("@action:inmenu", "Preview"));
 289     previewAction->setIcon(QIcon::fromTheme(QStringLiteral("view-preview")));
 290     previewAction->setCheckable(true);
 291     previewAction->setChecked(InformationPanelSettings::previewsShown());
 292
 293     QAction* configureAction = popup.addAction(i18nc("@action:inmenu", "Configure..."));
 294     configureAction->setIcon(QIcon::fromTheme(QStringLiteral("configure")));
 295
 296     popup.addSeparator();
 297     foreach (QAction* action, customContextMenuActions) {
 298         popup.addAction(action);
 299     }
 300
 301     // Open the popup and adjust the settings for the
 302     // selected action.
 303     QAction* action = popup.exec(QCursor::pos());
 304     if (!action) {
 305         return;
 306     }
 307
 308     const bool isChecked = action->isChecked();
 309     if (action == previewAction) {
 310         m_preview->setVisible(isChecked);
 311         InformationPanelSettings::setPreviewsShown(isChecked);
 312     } else if (action == configureAction) {
 313         FileMetaDataConfigurationDialog* dialog = new FileMetaDataConfigurationDialog(this);
 314         dialog->setDescription(i18nc("@label::textbox",
 315                                      "Select which data should be shown in the information panel:"));
 316         dialog->setItems(m_metaDataWidget->items());
 317         dialog->setAttribute(Qt::WA_DeleteOnClose);
 318         dialog->show();
 319         connect(dialog, &FileMetaDataConfigurationDialog::destroyed, this, &InformationPanelContent::refreshMetaData);
 320     }
 321 }
 322
 323 void InformationPanelContent::showIcon(const KFileItem& item)
 324 {
 325     m_outdatedPreviewTimer->stop();
 326     if (!applyPlace(item.targetUrl())) {
 327         const QPixmap icon = KIconLoader::global()->loadIcon(item.iconName(), KIconLoader::Desktop,
 328                                                              KIconLoader::SizeEnormous, KIconLoader::DefaultState,
 329                                                              item.overlays());
 330         m_preview->setPixmap(icon);
 331     }
 332 }
 333
 334 void InformationPanelContent::showPreview(const KFileItem& item,
 335                                           const QPixmap& pixmap)
 336 {
 337     m_outdatedPreviewTimer->stop();
 338     Q_UNUSED(item);
 339
 340     QPixmap p = pixmap;
 341     KIconLoader::global()->drawOverlays(item.overlays(), p, KIconLoader::Desktop);
 342     m_preview->setPixmap(p);
 343 }
 344
 345 void InformationPanelContent::markOutdatedPreview()
 346 {
 347     KIconEffect *iconEffect = KIconLoader::global()->iconEffect();
 348     QPixmap disabledPixmap = iconEffect->apply(m_preview->pixmap(),
 349                                                KIconLoader::Desktop,
 350                                                KIconLoader::DisabledState);
 351     m_preview->setPixmap(disabledPixmap);
 352 }
 353
 354 void InformationPanelContent::slotHasVideoChanged(bool hasVideo)
 355 {
 356     m_preview->setVisible(!hasVideo);
 357 }
 358
 359 void InformationPanelContent::refreshMetaData()
 360 {
 361     if (!m_item.isNull()) {
 362         showItem(m_item);
 363     }
 364 }
 365
 366 bool InformationPanelContent::applyPlace(const QUrl& url)
 367 {
 368     const int count = m_placesItemModel->count();
 369     for (int i = 0; i < count; ++i) {
 370         const PlacesItem* item = m_placesItemModel->placesItem(i);
 371         if (item->url().matches(url, QUrl::StripTrailingSlash)) {
 372             setNameLabelText(item->text());
 373             m_preview->setPixmap(QIcon::fromTheme(item->icon()).pixmap(128, 128));
 374             return true;
 375         }
 376     }
 377
 378     return false;
 379 }
 380
 381 void InformationPanelContent::setNameLabelText(const QString& text)
 382 {
 383     QTextOption textOption;
 384     textOption.setWrapMode(QTextOption::WrapAtWordBoundaryOrAnywhere);
 385
 386     const QString processedText = Qt::mightBeRichText(text) ? text : KStringHandler::preProcessWrap(text);
 387
 388     QTextLayout textLayout(processedText);
 389     textLayout.setFont(m_nameLabel->font());
 390     textLayout.setTextOption(textOption);
 391
 392     QString wrappedText;
 393     wrappedText.reserve(processedText.length());
 394
 395     // wrap the text to fit into the width of m_nameLabel
 396     textLayout.beginLayout();
 397     QTextLine line = textLayout.createLine();
 398     while (line.isValid()) {
 399         line.setLineWidth(m_nameLabel->width());
 400         wrappedText += processedText.midRef(line.textStart(), line.textLength());
 401
 402         line = textLayout.createLine();
 403         if (line.isValid()) {
 404             wrappedText += QChar::LineSeparator;
 405         }
 406     }
 407     textLayout.endLayout();
 408
 409     m_nameLabel->setText(wrappedText);
 410 }
 411
 412 void InformationPanelContent::adjustWidgetSizes(int width)
 413 {
 414     // If the text inside the name label or the info label cannot
 415     // get wrapped, then the maximum width of the label is increased
 416     // so that the width of the information panel gets increased.
 417     // To prevent this, the maximum width is adjusted to
 418     // the current width of the panel.
 419     const int maxWidth = width - style()->layoutSpacing(QSizePolicy::DefaultType, QSizePolicy::DefaultType, Qt::Horizontal) * 4;
 420     m_nameLabel->setMaximumWidth(maxWidth);
 421
 422     // The metadata widget also contains a text widget which may return
 423     // a large preferred width.
 424     if (m_metaDataWidget) {
 425         m_metaDataWidget->setMaximumWidth(maxWidth);
 426     }
 427
 428     // try to increase the preview as large as possible
 429     m_preview->setSizeHint(QSize(maxWidth, maxWidth));
 430
 431     if (m_phononWidget->isVisible()) {
 432         // assure that the size of the video player is the same as the preview size
 433         m_phononWidget->setVideoSize(QSize(maxWidth, maxWidth));
 434     }
 435 }
 436