src/panels/information/informationpanel.cpp

   1 /***************************************************************************
   2  *   Copyright (C) 2006 by Peter Penz <peter.penz@gmx.at>                  *
   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 "informationpanel.h"
  21
  22 #include <config-nepomuk.h>
  23
  24 #include <kdialog.h>
  25 #include <kdirnotify.h>
  26 #include <kfileitem.h>
  27 #include <kfilemetainfo.h>
  28 #include <kfileplacesmodel.h>
  29 #include <kglobalsettings.h>
  30 #include <kio/previewjob.h>
  31 #include <kiconeffect.h>
  32 #include <kiconloader.h>
  33 #include <klocale.h>
  34 #include <kmenu.h>
  35 #include <kseparator.h>
  36
  37 #ifdef HAVE_NEPOMUK
  38 #include <Nepomuk/Resource>
  39 #include <Nepomuk/Types/Property>
  40 #include <Nepomuk/Variant>
  41 #endif
  42
  43 #include <Phonon/BackendCapabilities>
  44 #include <Phonon/MediaObject>
  45 #include <Phonon/SeekSlider>
  46
  47 #include <QEvent>
  48 #include <QInputDialog>
  49 #include <QLabel>
  50 #include <QPainter>
  51 #include <QPixmap>
  52 #include <QResizeEvent>
  53 #include <QScrollArea>
  54 #include <QTextLayout>
  55 #include <QTextLine>
  56 #include <QTimer>
  57 #include <QScrollBar>
  58 #include <QVBoxLayout>
  59
  60 #include "dolphin_informationpanelsettings.h"
  61 #include "settings/dolphinsettings.h"
  62 #include "metadatawidget.h"
  63 #include "metatextlabel.h"
  64 #include "phononwidget.h"
  65 #include "pixmapviewer.h"
  66
  67 /**
  68  * Helper function for sorting items with qSort() in
  69  * InformationPanel::contextMenu().
  70  */
  71 bool lessThan(const QAction* action1, const QAction* action2)
  72 {
  73     return action1->text() < action2->text();
  74 }
  75
  76
  77 InformationPanel::InformationPanel(QWidget* parent) :
  78     Panel(parent),
  79     m_initialized(false),
  80     m_pendingPreview(false),
  81     m_infoTimer(0),
  82     m_outdatedPreviewTimer(0),
  83     m_shownUrl(),
  84     m_urlCandidate(),
  85     m_fileItem(),
  86     m_selection(),
  87     m_nameLabel(0),
  88     m_preview(0),
  89     m_previewSeparator(0),
  90     m_phononWidget(0),
  91     m_metaDataWidget(0),
  92     m_metaDataSeparator(0),
  93     m_metaTextArea(0),
  94     m_metaTextLabel(0)
  95 {
  96 }
  97
  98 InformationPanel::~InformationPanel()
  99 {
 100     InformationPanelSettings::self()->writeConfig();
 101 }
 102
 103 QSize InformationPanel::sizeHint() const
 104 {
 105     QSize size = Panel::sizeHint();
 106     size.setWidth(minimumSizeHint().width());
 107     return size;
 108 }
 109
 110 void InformationPanel::setUrl(const KUrl& url)
 111 {
 112     Panel::setUrl(url);
 113     if (url.isValid() && !isEqualToShownUrl(url)) {
 114         if (isVisible()) {
 115             cancelRequest();
 116             m_shownUrl = url;
 117             showItemInfo();
 118         } else {
 119             m_shownUrl = url;
 120         }
 121     }
 122 }
 123
 124 void InformationPanel::setSelection(const KFileItemList& selection)
 125 {
 126     if (!isVisible()) {
 127         return;
 128     }
 129
 130     if ((selection.count() == 0) && (m_selection.count() == 0)) {
 131         // The selection has not really changed, only the current index.
 132         // QItemSelectionModel emits a signal in this case and it is less
 133         // expensive doing the check this way instead of patching
 134         // DolphinView::emitSelectionChanged().
 135         return;
 136     }
 137
 138     m_selection = selection;
 139
 140     const int count = selection.count();
 141     if (count == 0) {
 142         if (!isEqualToShownUrl(url())) {
 143             m_shownUrl = url();
 144             showItemInfo();
 145         }
 146     } else {
 147         if ((count == 1) && !selection.first().url().isEmpty()) {
 148             m_urlCandidate = selection.first().url();
 149         }
 150         m_infoTimer->start();
 151     }
 152 }
 153
 154 void InformationPanel::requestDelayedItemInfo(const KFileItem& item)
 155 {
 156     if (!isVisible()) {
 157         return;
 158     }
 159
 160     cancelRequest();
 161
 162     m_fileItem = KFileItem();
 163     if (item.isNull()) {
 164         // The cursor is above the viewport. If files are selected,
 165         // show information regarding the selection.
 166         if (m_selection.size() > 0) {
 167             m_pendingPreview = false;
 168             m_infoTimer->start();
 169         }
 170     } else {
 171         const KUrl url = item.url();
 172         if (url.isValid() && !isEqualToShownUrl(url)) {
 173             m_urlCandidate = item.url();
 174             m_fileItem = item;
 175             m_infoTimer->start();
 176         }
 177     }
 178 }
 179
 180 void InformationPanel::showEvent(QShowEvent* event)
 181 {
 182     Panel::showEvent(event);
 183     if (!event->spontaneous()) {
 184         if (!m_initialized) {
 185             // do a delayed initialization so that no performance
 186             // penalty is given when Dolphin is started with a closed
 187             // Information Panel
 188             init();
 189         }
 190         showItemInfo();
 191     }
 192 }
 193
 194 void InformationPanel::resizeEvent(QResizeEvent* event)
 195 {
 196     if (isVisible()) {
 197         // If the text inside the name label or the info label cannot
 198         // get wrapped, then the maximum width of the label is increased
 199         // so that the width of the information panel gets increased.
 200         // To prevent this, the maximum width is adjusted to
 201         // the current width of the panel.
 202         const int maxWidth = event->size().width() - KDialog::spacingHint() * 4;
 203         m_nameLabel->setMaximumWidth(maxWidth);
 204
 205         // The metadata widget also contains a text widget which may return
 206         // a large preferred width.
 207         if (m_metaDataWidget != 0) {
 208             m_metaDataWidget->setMaximumWidth(maxWidth);
 209         }
 210
 211         // try to increase the preview as large as possible
 212         m_preview->setSizeHint(QSize(maxWidth, maxWidth));
 213         m_urlCandidate = m_shownUrl; // reset the URL candidate if a resizing is done
 214         m_infoTimer->start();
 215
 216         if (m_phononWidget->isVisible() && (m_phononWidget->mode() == PhononWidget::Video)) {
 217             // assure that the size of the video player is the same as the preview size
 218             m_phononWidget->setVideoSize(QSize(maxWidth, maxWidth));
 219         }
 220     }
 221     Panel::resizeEvent(event);
 222 }
 223
 224 bool InformationPanel::eventFilter(QObject* obj, QEvent* event)
 225 {
 226     // Check whether the size of the meta text area has changed and adjust
 227     // the fixed width in a way that no horizontal scrollbar needs to be shown.
 228     if ((obj == m_metaTextArea->viewport()) && (event->type() == QEvent::Resize)) {
 229         QResizeEvent* resizeEvent = static_cast<QResizeEvent*>(event);
 230         m_metaTextLabel->setFixedWidth(resizeEvent->size().width());
 231     }
 232     return Panel::eventFilter(obj, event);
 233 }
 234
 235 void InformationPanel::contextMenuEvent(QContextMenuEvent* event)
 236 {
 237     Panel::contextMenuEvent(event);
 238
 239 #ifdef HAVE_NEPOMUK
 240     if (showMultipleSelectionInfo()) {
 241         return;
 242     }
 243
 244     KMenu popup(this);
 245
 246     QAction* previewAction = popup.addAction(i18nc("@action:inmenu", "Preview"));
 247     previewAction->setIcon(KIcon("view-preview"));
 248     previewAction->setCheckable(true);
 249     previewAction->setChecked(InformationPanelSettings::showPreview());
 250
 251     const bool metaDataAvailable = MetaDataWidget::metaDataAvailable();
 252
 253     QAction* ratingAction = popup.addAction(i18nc("@action:inmenu", "Rating"));
 254     ratingAction->setIcon(KIcon("rating"));
 255     ratingAction->setCheckable(true);
 256     ratingAction->setChecked(InformationPanelSettings::showRating());
 257     ratingAction->setEnabled(metaDataAvailable);
 258
 259     QAction* commentAction = popup.addAction(i18nc("@action:inmenu", "Comment"));
 260     commentAction->setIcon(KIcon("text-plain"));
 261     commentAction->setCheckable(true);
 262     commentAction->setChecked(InformationPanelSettings::showComment());
 263     commentAction->setEnabled(metaDataAvailable);
 264
 265     QAction* tagsAction = popup.addAction(i18nc("@action:inmenu", "Tags"));
 266     tagsAction->setCheckable(true);
 267     tagsAction->setChecked(InformationPanelSettings::showTags());
 268     tagsAction->setEnabled(metaDataAvailable);
 269
 270     KConfig config("kmetainformationrc", KConfig::NoGlobals);
 271     KConfigGroup settings = config.group("Show");
 272     initMetaInfoSettings(settings);
 273
 274     QList<QAction*> actions;
 275
 276     // Get all meta information labels that are available for
 277     // the currently shown file item and add them to the popup.
 278     Nepomuk::Resource res(fileItem().url());
 279     QHash<QUrl, Nepomuk::Variant> properties = res.properties();
 280     QHash<QUrl, Nepomuk::Variant>::const_iterator it = properties.constBegin();
 281     while (it != properties.constEnd()) {
 282         Nepomuk::Types::Property prop(it.key());
 283         const QString key = prop.label();
 284
 285         // Meta information provided by Nepomuk that is already
 286         // available from KFileItem should not be configurable.
 287         bool skip = (key == "fileExtension") ||
 288                     (key == "name") ||
 289                     (key == "sourceModified") ||
 290                     (key == "size") ||
 291                     (key == "mime type");
 292         if (!skip) {
 293             // Check whether there is already a meta information
 294             // having the same label. In this case don't show it
 295             // twice in the menu.
 296             foreach (const QAction* action, actions) {
 297                 if (action->data().toString() == key) {
 298                     skip = true;
 299                     break;
 300                 }
 301             }
 302         }
 303
 304         if (!skip) {
 305             const QString label = key; // TODO
 306             QAction* action = new QAction(label, &popup);
 307             action->setCheckable(true);
 308             action->setChecked(settings.readEntry(key, true));
 309             action->setData(key);
 310             actions.append(action);
 311         }
 312
 313         ++it;
 314     }
 315
 316     if (actions.count() > 0) {
 317         popup.addSeparator();
 318
 319         // add all items alphabetically sorted to the popup
 320         qSort(actions.begin(), actions.end(), lessThan);
 321         foreach (QAction* action, actions) {
 322             popup.addAction(action);
 323         }
 324     }
 325
 326     // Open the popup and adjust the settings for the
 327     // selected action.
 328     QAction* action = popup.exec(QCursor::pos());
 329     if (action == 0) {
 330         return;
 331     }
 332
 333     const bool isChecked = action->isChecked();
 334     if (action == previewAction) {
 335         m_preview->setVisible(isChecked);
 336         m_previewSeparator->setVisible(isChecked);
 337         InformationPanelSettings::setShowPreview(isChecked);
 338         updatePhononWidget();
 339     } else if (action == ratingAction) {
 340         m_metaDataWidget->setRatingVisible(isChecked);
 341         InformationPanelSettings::setShowRating(isChecked);
 342     } else if (action == commentAction) {
 343         m_metaDataWidget->setCommentVisible(isChecked);
 344         InformationPanelSettings::setShowComment(isChecked);
 345     } else if (action == tagsAction) {
 346         m_metaDataWidget->setTagsVisible(isChecked);
 347         InformationPanelSettings::setShowTags(isChecked);
 348     } else {
 349         settings.writeEntry(action->data().toString(), action->isChecked());
 350         settings.sync();
 351         showMetaInfo();
 352     }
 353
 354     if (m_metaDataWidget != 0) {
 355         const bool visible = m_metaDataWidget->isRatingVisible() ||
 356                              m_metaDataWidget->isCommentVisible() ||
 357                              m_metaDataWidget->areTagsVisible();
 358         m_metaDataSeparator->setVisible(visible);
 359     }
 360 #endif
 361 }
 362
 363 void InformationPanel::showItemInfo()
 364 {
 365     if (!isVisible()) {
 366         return;
 367     }
 368
 369     cancelRequest();
 370
 371     if (showMultipleSelectionInfo()) {
 372         KIconLoader iconLoader;
 373         QPixmap icon = iconLoader.loadIcon("dialog-information",
 374                                            KIconLoader::NoGroup,
 375                                            KIconLoader::SizeEnormous);
 376         m_preview->setPixmap(icon);
 377         setNameLabelText(i18ncp("@info", "%1 item selected", "%1 items selected",  m_selection.count()));
 378         m_shownUrl = KUrl();
 379     } else {
 380         const KFileItem item = fileItem();
 381         const KUrl itemUrl = item.url();
 382         if (!applyPlace(itemUrl)) {
 383             // try to get a preview pixmap from the item...
 384             m_pendingPreview = true;
 385
 386             // Mark the currently shown preview as outdated. This is done
 387             // with a small delay to prevent a flickering when the next preview
 388             // can be shown within a short timeframe.
 389             m_outdatedPreviewTimer->start();
 390
 391             KIO::PreviewJob* job = KIO::filePreview(KFileItemList() << item,
 392                                                     m_preview->width(),
 393                                                     m_preview->height(),
 394                                                     0,
 395                                                     0,
 396                                                     false,
 397                                                     true);
 398
 399             connect(job, SIGNAL(gotPreview(const KFileItem&, const QPixmap&)),
 400                     this, SLOT(showPreview(const KFileItem&, const QPixmap&)));
 401             connect(job, SIGNAL(failed(const KFileItem&)),
 402                     this, SLOT(showIcon(const KFileItem&)));
 403
 404             setNameLabelText(itemUrl.fileName());
 405         }
 406     }
 407
 408     showMetaInfo();
 409 }
 410
 411 void InformationPanel::slotInfoTimeout()
 412 {
 413     m_shownUrl = m_urlCandidate;
 414     showItemInfo();
 415 }
 416
 417 void InformationPanel::markOutdatedPreview()
 418 {
 419     KIconEffect iconEffect;
 420     QPixmap disabledPixmap = iconEffect.apply(m_preview->pixmap(),
 421                                               KIconLoader::Desktop,
 422                                               KIconLoader::DisabledState);
 423     m_preview->setPixmap(disabledPixmap);
 424 }
 425
 426 void InformationPanel::showIcon(const KFileItem& item)
 427 {
 428     m_outdatedPreviewTimer->stop();
 429     m_pendingPreview = false;
 430     if (!applyPlace(item.url())) {
 431         m_preview->setPixmap(item.pixmap(KIconLoader::SizeEnormous));
 432     }
 433 }
 434
 435 void InformationPanel::showPreview(const KFileItem& item,
 436                                   const QPixmap& pixmap)
 437 {
 438     m_outdatedPreviewTimer->stop();
 439
 440     Q_UNUSED(item);
 441     if (m_pendingPreview) {
 442         m_preview->setPixmap(pixmap);
 443         m_pendingPreview = false;
 444     }
 445 }
 446
 447 void InformationPanel::slotFileRenamed(const QString& source, const QString& dest)
 448 {
 449     const KUrl sourceUrl = KUrl(source);
 450
 451     // Verify whether the renamed item is selected. If this is the case, the
 452     // selection must be updated with the renamed item.
 453     bool isSelected = false;
 454     for (int i = m_selection.size() - 1; i >= 0; --i) {
 455         if (m_selection[i].url() == sourceUrl) {
 456             m_selection.removeAt(i);
 457             isSelected = true;
 458             break;
 459         }
 460     }
 461
 462     if ((m_shownUrl == sourceUrl) || isSelected) {
 463         m_shownUrl = KUrl(dest);
 464         m_fileItem = KFileItem(KFileItem::Unknown, KFileItem::Unknown, m_shownUrl);
 465         if (isSelected) {
 466             m_selection.append(m_fileItem);
 467         }
 468         showItemInfo();
 469     }
 470 }
 471
 472 void InformationPanel::slotFilesAdded(const QString& directory)
 473 {
 474     if (m_shownUrl == KUrl(directory)) {
 475         // If the 'trash' icon changes because the trash has been emptied or got filled,
 476         // the signal filesAdded("trash:/") will be emitted.
 477         KFileItem item(KFileItem::Unknown, KFileItem::Unknown, KUrl(directory));
 478         requestDelayedItemInfo(item);
 479     }
 480 }
 481
 482 void InformationPanel::slotFilesChanged(const QStringList& files)
 483 {
 484     foreach (const QString& fileName, files) {
 485         if (m_shownUrl == KUrl(fileName)) {
 486             showItemInfo();
 487             break;
 488         }
 489     }
 490 }
 491
 492 void InformationPanel::slotFilesRemoved(const QStringList& files)
 493 {
 494     foreach (const QString& fileName, files) {
 495         if (m_shownUrl == KUrl(fileName)) {
 496             // the currently shown item has been removed, show
 497             // the parent directory as fallback
 498             reset();
 499             break;
 500         }
 501     }
 502 }
 503
 504 void InformationPanel::slotEnteredDirectory(const QString& directory)
 505 {
 506     if (m_shownUrl == KUrl(directory)) {
 507         KFileItem item(KFileItem::Unknown, KFileItem::Unknown, KUrl(directory));
 508         requestDelayedItemInfo(item);
 509     }
 510 }
 511
 512 void InformationPanel::slotLeftDirectory(const QString& directory)
 513 {
 514     if (m_shownUrl == KUrl(directory)) {
 515         // The signal 'leftDirectory' is also emitted when a media
 516         // has been unmounted. In this case no directory change will be
 517         // done in Dolphin, but the Information Panel must be updated to
 518         // indicate an invalid directory.
 519         reset();
 520     }
 521 }
 522
 523 void InformationPanel::slotPlayingStarted()
 524 {
 525     m_preview->setVisible(m_phononWidget->mode() != PhononWidget::Video);
 526 }
 527
 528 void InformationPanel::slotPlayingStopped()
 529 {
 530     m_preview->setVisible(true);
 531 }
 532
 533 bool InformationPanel::applyPlace(const KUrl& url)
 534 {
 535     KFilePlacesModel* placesModel = DolphinSettings::instance().placesModel();
 536     int count = placesModel->rowCount();
 537
 538     for (int i = 0; i < count; ++i) {
 539         QModelIndex index = placesModel->index(i, 0);
 540
 541         if (url.equals(placesModel->url(index), KUrl::CompareWithoutTrailingSlash)) {
 542             setNameLabelText(placesModel->text(index));
 543             m_preview->setPixmap(placesModel->icon(index).pixmap(128, 128));
 544             return true;
 545         }
 546     }
 547
 548     return false;
 549 }
 550
 551 void InformationPanel::cancelRequest()
 552 {
 553     m_infoTimer->stop();
 554 }
 555
 556 void InformationPanel::showMetaInfo()
 557 {
 558     m_metaTextLabel->clear();
 559
 560     if (showMultipleSelectionInfo()) {
 561         if (m_metaDataWidget != 0) {
 562             KUrl::List urls;
 563             foreach (const KFileItem& item, m_selection) {
 564                 urls.append(item.targetUrl());
 565             }
 566             m_metaDataWidget->setFiles(urls);
 567         }
 568
 569         quint64 totalSize = 0;
 570         foreach (const KFileItem& item, m_selection) {
 571             // Only count the size of files, not dirs to match what
 572             // DolphinViewContainer::selectionStatusBarText() does.
 573             if (!item.isDir() && !item.isLink()) {
 574                 totalSize += item.size();
 575             }
 576         }
 577         m_metaTextLabel->add(i18nc("@label", "Total size:"), KIO::convertSize(totalSize));
 578     } else {
 579         const KFileItem item = fileItem();
 580         if (item.isDir()) {
 581             m_metaTextLabel->add(i18nc("@label", "Type:"), i18nc("@label", "Folder"));
 582             m_metaTextLabel->add(i18nc("@label", "Modified:"), item.timeString());
 583         } else {
 584             m_metaTextLabel->add(i18nc("@label", "Type:"), item.mimeComment());
 585
 586             m_metaTextLabel->add(i18nc("@label", "Size:"), KIO::convertSize(item.size()));
 587             m_metaTextLabel->add(i18nc("@label", "Modified:"), item.timeString());
 588
 589 #ifdef HAVE_NEPOMUK
 590             KConfig config("kmetainformationrc", KConfig::NoGlobals);
 591             KConfigGroup settings = config.group("Show");
 592             initMetaInfoSettings(settings);
 593
 594             Nepomuk::Resource res(item.url());
 595
 596             QHash<QUrl, Nepomuk::Variant> properties = res.properties();
 597             QHash<QUrl, Nepomuk::Variant>::const_iterator it = properties.constBegin();
 598             while (it != properties.constEnd()) {
 599                 Nepomuk::Types::Property prop(it.key());
 600                 const QString label = prop.label();
 601                 if (settings.readEntry(label, true)) {
 602                     // TODO: use Nepomuk::formatValue(res, prop) if available
 603                     // instead of it.value().toString()
 604                     m_metaTextLabel->add(label, it.value().toString());
 605                 }
 606                 ++it;
 607             }
 608 #endif
 609         }
 610
 611         if (m_metaDataWidget != 0) {
 612             m_metaDataWidget->setFile(item.targetUrl());
 613         }
 614     }
 615
 616     updatePhononWidget();
 617 }
 618
 619 KFileItem InformationPanel::fileItem() const
 620 {
 621     if (!m_fileItem.isNull()) {
 622         return m_fileItem;
 623     }
 624
 625     if (!m_selection.isEmpty()) {
 626         Q_ASSERT(m_selection.count() == 1);
 627         return m_selection.first();
 628     }
 629
 630     // no item is hovered and no selection has been done: provide
 631     // an item for the directory represented by m_shownUrl
 632     KFileItem item(KFileItem::Unknown, KFileItem::Unknown, m_shownUrl);
 633     item.refresh();
 634     return item;
 635 }
 636
 637 bool InformationPanel::showMultipleSelectionInfo() const
 638 {
 639     return m_fileItem.isNull() && (m_selection.count() > 1);
 640 }
 641
 642 bool InformationPanel::isEqualToShownUrl(const KUrl& url) const
 643 {
 644     return m_shownUrl.equals(url, KUrl::CompareWithoutTrailingSlash);
 645 }
 646
 647 void InformationPanel::setNameLabelText(const QString& text)
 648 {
 649     QTextOption textOption;
 650     textOption.setWrapMode(QTextOption::WrapAtWordBoundaryOrAnywhere);
 651
 652     QTextLayout textLayout(text);
 653     textLayout.setFont(m_nameLabel->font());
 654     textLayout.setTextOption(textOption);
 655
 656     QString wrappedText;
 657     wrappedText.reserve(text.length());
 658
 659     // wrap the text to fit into the width of m_nameLabel
 660     textLayout.beginLayout();
 661     QTextLine line = textLayout.createLine();
 662     while (line.isValid()) {
 663         line.setLineWidth(m_nameLabel->width());
 664         wrappedText += text.mid(line.textStart(), line.textLength());
 665
 666         line = textLayout.createLine();
 667         if (line.isValid()) {
 668             wrappedText += QChar::LineSeparator;
 669         }
 670     }
 671     textLayout.endLayout();
 672
 673     m_nameLabel->setText(wrappedText);
 674 }
 675
 676 void InformationPanel::reset()
 677 {
 678     m_selection.clear();
 679     m_shownUrl = url();
 680     m_fileItem = KFileItem();
 681     showItemInfo();
 682 }
 683
 684 void InformationPanel::initMetaInfoSettings(KConfigGroup& group)
 685 {
 686     if (!group.readEntry("initialized", false)) {
 687         // The resource file is read the first time. Assure
 688         // that some meta information is disabled per default.
 689         group.writeEntry("fileExtension", false);
 690         group.writeEntry("url", false);
 691         group.writeEntry("sourceModified", false);
 692         group.writeEntry("parentUrl", false);
 693         group.writeEntry("size", false);
 694         group.writeEntry("mime type", false);
 695         group.writeEntry("depth", false);
 696         group.writeEntry("name", false);
 697
 698         // mark the group as initialized
 699         group.writeEntry("initialized", true);
 700     }
 701 }
 702
 703 void InformationPanel::updatePhononWidget()
 704 {
 705     const bool multipleSelections = showMultipleSelectionInfo();
 706     const bool showPreview = InformationPanelSettings::showPreview();
 707
 708     if (multipleSelections || !showPreview) {
 709         m_phononWidget->hide();
 710     } else if (!multipleSelections && showPreview) {
 711         const KFileItem item = fileItem();
 712         const QString mimeType = item.mimetype();
 713         const bool usePhonon = Phonon::BackendCapabilities::isMimeTypeAvailable(mimeType) &&
 714                                (mimeType != "image/png");  // TODO: workaround, as Phonon
 715                                                            // thinks it supports PNG images
 716         if (usePhonon) {
 717             m_phononWidget->show();
 718             PhononWidget::Mode mode = mimeType.startsWith(QLatin1String("video"))
 719                                       ? PhononWidget::Video
 720                                       : PhononWidget::Audio;
 721             m_phononWidget->setMode(mode);
 722             m_phononWidget->setUrl(item.url());
 723             if ((mode == PhononWidget::Video) && m_preview->isVisible()) {
 724                 m_phononWidget->setVideoSize(m_preview->size());
 725             }
 726         } else {
 727             m_phononWidget->hide();
 728             m_preview->setVisible(true);
 729         }
 730     }
 731 }
 732
 733 void InformationPanel::init()
 734 {
 735     m_infoTimer = new QTimer(this);
 736     m_infoTimer->setInterval(300);
 737     m_infoTimer->setSingleShot(true);
 738     connect(m_infoTimer, SIGNAL(timeout()),
 739             this, SLOT(slotInfoTimeout()));
 740
 741     // Initialize timer for disabling an outdated preview with a small
 742     // delay. This prevents flickering if the new preview can be generated
 743     // within a very small timeframe.
 744     m_outdatedPreviewTimer = new QTimer(this);
 745     m_outdatedPreviewTimer->setInterval(300);
 746     m_outdatedPreviewTimer->setSingleShot(true);
 747     connect(m_outdatedPreviewTimer, SIGNAL(timeout()),
 748             this, SLOT(markOutdatedPreview()));
 749
 750     QVBoxLayout* layout = new QVBoxLayout;
 751     layout->setSpacing(KDialog::spacingHint());
 752
 753     // name
 754     m_nameLabel = new QLabel(this);
 755     QFont font = m_nameLabel->font();
 756     font.setBold(true);
 757     m_nameLabel->setFont(font);
 758     m_nameLabel->setAlignment(Qt::AlignHCenter);
 759     m_nameLabel->setSizePolicy(QSizePolicy::Preferred, QSizePolicy::Fixed);
 760     m_nameLabel->setMaximumWidth(KIconLoader::SizeEnormous);
 761
 762     // preview
 763     const int minPreviewWidth = KIconLoader::SizeEnormous + KIconLoader::SizeMedium;
 764
 765     m_preview = new PixmapViewer(this);
 766     m_preview->setMinimumWidth(minPreviewWidth);
 767     m_preview->setMinimumHeight(KIconLoader::SizeEnormous);
 768
 769     m_phononWidget = new PhononWidget(this);
 770     m_phononWidget->setMinimumWidth(minPreviewWidth);
 771     connect(m_phononWidget, SIGNAL(playingStarted()),
 772             this, SLOT(slotPlayingStarted()));
 773     connect(m_phononWidget, SIGNAL(playingStopped()),
 774             this, SLOT(slotPlayingStopped()));
 775
 776     m_previewSeparator = new KSeparator(this);
 777
 778     const bool showPreview = InformationPanelSettings::showPreview();
 779     m_preview->setVisible(showPreview);
 780     m_previewSeparator->setVisible(showPreview);
 781
 782     if (MetaDataWidget::metaDataAvailable()) {
 783         // rating, comment and tags
 784         m_metaDataWidget = new MetaDataWidget(this);
 785         m_metaDataWidget->setSizePolicy(QSizePolicy::Preferred, QSizePolicy::Fixed);
 786         m_metaDataWidget->setMaximumWidth(KIconLoader::SizeEnormous);
 787
 788         const bool showRating  = InformationPanelSettings::showRating();
 789         const bool showComment = InformationPanelSettings::showComment();
 790         const bool showTags    = InformationPanelSettings::showTags();
 791
 792         m_metaDataWidget->setRatingVisible(showRating);
 793         m_metaDataWidget->setCommentVisible(showComment);
 794         m_metaDataWidget->setTagsVisible(showTags);
 795
 796         m_metaDataSeparator = new KSeparator(this);
 797         m_metaDataSeparator->setVisible(showRating || showComment || showTags);
 798     }
 799
 800     // general meta text information
 801     m_metaTextLabel = new MetaTextLabel(this);
 802     m_metaTextLabel->setSizePolicy(QSizePolicy::Preferred, QSizePolicy::Fixed);
 803
 804     m_metaTextArea = new QScrollArea(this);
 805     m_metaTextArea->setWidget(m_metaTextLabel);
 806     m_metaTextArea->setWidgetResizable(true);
 807     m_metaTextArea->setFrameShape(QFrame::NoFrame);
 808
 809     QWidget* viewport = m_metaTextArea->viewport();
 810     viewport->installEventFilter(this);
 811
 812     QPalette palette = viewport->palette();
 813     palette.setColor(viewport->backgroundRole(), QColor(Qt::transparent));
 814     viewport->setPalette(palette);
 815
 816     layout->addWidget(m_nameLabel);
 817     layout->addWidget(new KSeparator(this));
 818     layout->addWidget(m_preview);
 819     layout->addWidget(m_phononWidget);
 820     layout->addWidget(m_previewSeparator);
 821     if (m_metaDataWidget != 0) {
 822         layout->addWidget(m_metaDataWidget);
 823         layout->addWidget(m_metaDataSeparator);
 824     }
 825     layout->addWidget(m_metaTextArea);
 826     setLayout(layout);
 827
 828     org::kde::KDirNotify* dirNotify = new org::kde::KDirNotify(QString(), QString(),
 829                                                                QDBusConnection::sessionBus(), this);
 830     connect(dirNotify, SIGNAL(FileRenamed(QString, QString)), SLOT(slotFileRenamed(QString, QString)));
 831     connect(dirNotify, SIGNAL(FilesAdded(QString)), SLOT(slotFilesAdded(QString)));
 832     connect(dirNotify, SIGNAL(FilesChanged(QStringList)), SLOT(slotFilesChanged(QStringList)));
 833     connect(dirNotify, SIGNAL(FilesRemoved(QStringList)), SLOT(slotFilesRemoved(QStringList)));
 834     connect(dirNotify, SIGNAL(enteredDirectory(QString)), SLOT(slotEnteredDirectory(QString)));
 835     connect(dirNotify, SIGNAL(leftDirectory(QString)), SLOT(slotLeftDirectory(QString)));
 836
 837     m_initialized = true;
 838 }
 839
 840 #include "informationpanel.moc"