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 <kfileplacesmodel.h>
  27 #include <klocale.h>
  28 #include <kstandarddirs.h>
  29 #include <kio/previewjob.h>
  30 #include <kfileitem.h>
  31 #include <kglobalsettings.h>
  32 #include <kfilemetainfo.h>
  33 #include <kiconeffect.h>
  34 #include <kseparator.h>
  35 #include <kiconloader.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 "settings/dolphinsettings.h"
  61 #include "metadatawidget.h"
  62 #include "metatextlabel.h"
  63 #include "phononwidget.h"
  64 #include "pixmapviewer.h"
  65
  66 InformationPanel::InformationPanel(QWidget* parent) :
  67     Panel(parent),
  68     m_initialized(false),
  69     m_pendingPreview(false),
  70     m_infoTimer(0),
  71     m_outdatedPreviewTimer(0),
  72     m_shownUrl(),
  73     m_urlCandidate(),
  74     m_fileItem(),
  75     m_selection(),
  76     m_nameLabel(0),
  77     m_preview(0),
  78     m_phononWidget(0),
  79     m_metaDataWidget(0),
  80     m_metaTextArea(0),
  81     m_metaTextLabel(0)
  82 {
  83 }
  84
  85 InformationPanel::~InformationPanel()
  86 {
  87 }
  88
  89 QSize InformationPanel::sizeHint() const
  90 {
  91     QSize size = Panel::sizeHint();
  92     size.setWidth(minimumSizeHint().width());
  93     return size;
  94 }
  95
  96 void InformationPanel::setUrl(const KUrl& url)
  97 {
  98     Panel::setUrl(url);
  99     if (url.isValid() && !isEqualToShownUrl(url)) {
 100         if (isVisible()) {
 101             cancelRequest();
 102             m_shownUrl = url;
 103             showItemInfo();
 104         } else {
 105             m_shownUrl = url;
 106         }
 107     }
 108 }
 109
 110 void InformationPanel::setSelection(const KFileItemList& selection)
 111 {
 112     if (!isVisible()) {
 113         return;
 114     }
 115
 116     if ((selection.count() == 0) && (m_selection.count() == 0)) {
 117         // The selection has not really changed, only the current index.
 118         // QItemSelectionModel emits a signal in this case and it is less
 119         // expensive doing the check this way instead of patching
 120         // DolphinView::emitSelectionChanged().
 121         return;
 122     }
 123
 124     m_selection = selection;
 125
 126     const int count = selection.count();
 127     if (count == 0) {
 128         if (!isEqualToShownUrl(url())) {
 129             m_shownUrl = url();
 130             showItemInfo();
 131         }
 132     } else {
 133         if ((count == 1) && !selection.first().url().isEmpty()) {
 134             m_urlCandidate = selection.first().url();
 135         }
 136         m_infoTimer->start();
 137     }
 138 }
 139
 140 void InformationPanel::requestDelayedItemInfo(const KFileItem& item)
 141 {
 142     if (!isVisible()) {
 143         return;
 144     }
 145
 146     cancelRequest();
 147
 148     m_fileItem = KFileItem();
 149     if (item.isNull()) {
 150         // The cursor is above the viewport. If files are selected,
 151         // show information regarding the selection.
 152         if (m_selection.size() > 0) {
 153             m_pendingPreview = false;
 154             m_infoTimer->start();
 155         }
 156     } else {
 157         const KUrl url = item.url();
 158         if (url.isValid() && !isEqualToShownUrl(url)) {
 159             m_urlCandidate = item.url();
 160             m_fileItem = item;
 161             m_infoTimer->start();
 162         }
 163     }
 164 }
 165
 166 void InformationPanel::showEvent(QShowEvent* event)
 167 {
 168     Panel::showEvent(event);
 169     if (!event->spontaneous()) {
 170         if (!m_initialized) {
 171             // do a delayed initialization so that no performance
 172             // penalty is given when Dolphin is started with a closed
 173             // Information Panel
 174             init();
 175         }
 176         showItemInfo();
 177     }
 178 }
 179
 180 void InformationPanel::resizeEvent(QResizeEvent* event)
 181 {
 182     if (isVisible()) {
 183         // If the text inside the name label or the info label cannot
 184         // get wrapped, then the maximum width of the label is increased
 185         // so that the width of the information panel gets increased.
 186         // To prevent this, the maximum width is adjusted to
 187         // the current width of the panel.
 188         const int maxWidth = event->size().width() - KDialog::spacingHint() * 4;
 189         m_nameLabel->setMaximumWidth(maxWidth);
 190
 191         // try to increase the preview as large as possible
 192         m_preview->setSizeHint(QSize(maxWidth, maxWidth));
 193         m_urlCandidate = m_shownUrl; // reset the URL candidate if a resizing is done
 194         m_infoTimer->start();
 195     }
 196     Panel::resizeEvent(event);
 197 }
 198
 199 bool InformationPanel::eventFilter(QObject* obj, QEvent* event)
 200 {
 201     // Check whether the size of the meta text area has changed and adjust
 202     // the fixed width in a way that no horizontal scrollbar needs to be shown.
 203     if ((obj == m_metaTextArea->viewport()) && (event->type() == QEvent::Resize)) {
 204         QResizeEvent* resizeEvent = static_cast<QResizeEvent*>(event);
 205         m_metaTextLabel->setFixedWidth(resizeEvent->size().width());
 206     }
 207     return Panel::eventFilter(obj, event);
 208 }
 209
 210 void InformationPanel::showItemInfo()
 211 {
 212     if (!isVisible()) {
 213         return;
 214     }
 215
 216     cancelRequest();
 217
 218     if (showMultipleSelectionInfo()) {
 219         KIconLoader iconLoader;
 220         QPixmap icon = iconLoader.loadIcon("dialog-information",
 221                                            KIconLoader::NoGroup,
 222                                            KIconLoader::SizeEnormous);
 223         m_preview->setPixmap(icon);
 224         setNameLabelText(i18ncp("@info", "%1 item selected", "%1 items selected",  m_selection.count()));
 225         m_shownUrl = KUrl();
 226     } else {
 227         const KFileItem item = fileItem();
 228         const KUrl itemUrl = item.url();
 229         if (!applyPlace(itemUrl)) {
 230             // try to get a preview pixmap from the item...
 231             m_pendingPreview = true;
 232
 233             // Mark the currently shown preview as outdated. This is done
 234             // with a small delay to prevent a flickering when the next preview
 235             // can be shown within a short timeframe.
 236             m_outdatedPreviewTimer->start();
 237
 238             KIO::PreviewJob* job = KIO::filePreview(KFileItemList() << item,
 239                                                     m_preview->width(),
 240                                                     m_preview->height(),
 241                                                     0,
 242                                                     0,
 243                                                     false,
 244                                                     true);
 245
 246             connect(job, SIGNAL(gotPreview(const KFileItem&, const QPixmap&)),
 247                     this, SLOT(showPreview(const KFileItem&, const QPixmap&)));
 248             connect(job, SIGNAL(failed(const KFileItem&)),
 249                     this, SLOT(showIcon(const KFileItem&)));
 250
 251             setNameLabelText(itemUrl.fileName());
 252         }
 253     }
 254
 255     showMetaInfo();
 256 }
 257
 258 void InformationPanel::slotInfoTimeout()
 259 {
 260     m_shownUrl = m_urlCandidate;
 261     showItemInfo();
 262 }
 263
 264 void InformationPanel::markOutdatedPreview()
 265 {
 266     KIconEffect iconEffect;
 267     QPixmap disabledPixmap = iconEffect.apply(m_preview->pixmap(),
 268                                               KIconLoader::Desktop,
 269                                               KIconLoader::DisabledState);
 270     m_preview->setPixmap(disabledPixmap);
 271 }
 272
 273 void InformationPanel::showIcon(const KFileItem& item)
 274 {
 275     m_outdatedPreviewTimer->stop();
 276     m_pendingPreview = false;
 277     if (!applyPlace(item.url())) {
 278         m_preview->setPixmap(item.pixmap(KIconLoader::SizeEnormous));
 279     }
 280 }
 281
 282 void InformationPanel::showPreview(const KFileItem& item,
 283                                   const QPixmap& pixmap)
 284 {
 285     m_outdatedPreviewTimer->stop();
 286
 287     Q_UNUSED(item);
 288     if (m_pendingPreview) {
 289         m_preview->setPixmap(pixmap);
 290         m_pendingPreview = false;
 291     }
 292 }
 293
 294 void InformationPanel::slotFileRenamed(const QString& source, const QString& dest)
 295 {
 296     if (m_shownUrl == KUrl(source)) {
 297         // the currently shown file has been renamed, hence update the item information
 298         // for the renamed file
 299         KFileItem item(KFileItem::Unknown, KFileItem::Unknown, KUrl(dest));
 300         requestDelayedItemInfo(item);
 301     }
 302 }
 303
 304 void InformationPanel::slotFilesAdded(const QString& directory)
 305 {
 306     if (m_shownUrl == KUrl(directory)) {
 307         // If the 'trash' icon changes because the trash has been emptied or got filled,
 308         // the signal filesAdded("trash:/") will be emitted.
 309         KFileItem item(KFileItem::Unknown, KFileItem::Unknown, KUrl(directory));
 310         requestDelayedItemInfo(item);
 311     }
 312 }
 313
 314 void InformationPanel::slotFilesChanged(const QStringList& files)
 315 {
 316     foreach (const QString& fileName, files) {
 317         if (m_shownUrl == KUrl(fileName)) {
 318             showItemInfo();
 319             break;
 320         }
 321     }
 322 }
 323
 324 void InformationPanel::slotFilesRemoved(const QStringList& files)
 325 {
 326     foreach (const QString& fileName, files) {
 327         if (m_shownUrl == KUrl(fileName)) {
 328             // the currently shown item has been removed, show
 329             // the parent directory as fallback
 330             m_shownUrl = url();
 331             showItemInfo();
 332             break;
 333         }
 334     }
 335 }
 336
 337 void InformationPanel::slotEnteredDirectory(const QString& directory)
 338 {
 339     if (m_shownUrl == KUrl(directory)) {
 340         KFileItem item(KFileItem::Unknown, KFileItem::Unknown, KUrl(directory));
 341         requestDelayedItemInfo(item);
 342     }
 343 }
 344
 345 void InformationPanel::slotLeftDirectory(const QString& directory)
 346 {
 347     if (m_shownUrl == KUrl(directory)) {
 348         // The signal 'leftDirectory' is also emitted when a media
 349         // has been unmounted. In this case no directory change will be
 350         // done in Dolphin, but the Information Panel must be updated to
 351         // indicate an invalid directory.
 352         m_shownUrl = url();
 353         showItemInfo();
 354     }
 355 }
 356
 357 bool InformationPanel::applyPlace(const KUrl& url)
 358 {
 359     KFilePlacesModel* placesModel = DolphinSettings::instance().placesModel();
 360     int count = placesModel->rowCount();
 361
 362     for (int i = 0; i < count; ++i) {
 363         QModelIndex index = placesModel->index(i, 0);
 364
 365         if (url.equals(placesModel->url(index), KUrl::CompareWithoutTrailingSlash)) {
 366             setNameLabelText(placesModel->text(index));
 367             m_preview->setPixmap(placesModel->icon(index).pixmap(128, 128));
 368             return true;
 369         }
 370     }
 371
 372     return false;
 373 }
 374
 375 void InformationPanel::cancelRequest()
 376 {
 377     m_infoTimer->stop();
 378 }
 379
 380 void InformationPanel::showMetaInfo()
 381 {
 382     m_metaTextLabel->clear();
 383
 384     if (showMultipleSelectionInfo()) {
 385         if (m_metaDataWidget != 0) {
 386             KUrl::List urls;
 387             foreach (const KFileItem& item, m_selection) {
 388                 urls.append(item.targetUrl());
 389             }
 390             m_metaDataWidget->setFiles(urls);
 391         }
 392
 393         quint64 totalSize = 0;
 394         foreach (const KFileItem& item, m_selection) {
 395             // Only count the size of files, not dirs to match what
 396             // DolphinViewContainer::selectionStatusBarText() does.
 397             if (!item.isDir() && !item.isLink()) {
 398                 totalSize += item.size();
 399             }
 400         }
 401         m_metaTextLabel->add(i18nc("@label", "Total size:"), KIO::convertSize(totalSize));
 402     } else {
 403         const KFileItem item = fileItem();
 404         if (item.isDir()) {
 405             m_metaTextLabel->add(i18nc("@label", "Type:"), i18nc("@label", "Folder"));
 406             m_metaTextLabel->add(i18nc("@label", "Modified:"), item.timeString());
 407         } else {
 408             m_metaTextLabel->add(i18nc("@label", "Type:"), item.mimeComment());
 409
 410             m_metaTextLabel->add(i18nc("@label", "Size:"), KIO::convertSize(item.size()));
 411             m_metaTextLabel->add(i18nc("@label", "Modified:"), item.timeString());
 412
 413 #ifdef HAVE_NEPOMUK
 414             Nepomuk::Resource res(item.url());
 415
 416             QHash<QUrl, Nepomuk::Variant> properties = res.properties();
 417             QHash<QUrl, Nepomuk::Variant>::const_iterator it = properties.constBegin();
 418             while (it != properties.constEnd()) {
 419                 Nepomuk::Types::Property prop(it.key());
 420                 // TODO: use Nepomuk::formatValue(res, prop) if available
 421                 // instead of it.value().toString()
 422                 m_metaTextLabel->add(prop.label(), it.value().toString());
 423                 ++it;
 424             }
 425 #endif
 426         }
 427
 428         if (m_metaDataWidget != 0) {
 429             m_metaDataWidget->setFile(item.targetUrl());
 430         }
 431
 432         if (Phonon::BackendCapabilities::isMimeTypeAvailable(item.mimetype())) {
 433             if (m_phononWidget == 0) {
 434                 m_phononWidget = new PhononWidget(this);
 435
 436                 QVBoxLayout* vBoxLayout = qobject_cast<QVBoxLayout*>(layout());
 437                 Q_ASSERT(vBoxLayout != 0);
 438                 vBoxLayout->insertWidget(3, m_phononWidget);
 439             }
 440             m_phononWidget->setUrl(item.url());
 441         } else {
 442             delete m_phononWidget;
 443             m_phononWidget = 0;
 444         }
 445     }
 446 }
 447
 448 KFileItem InformationPanel::fileItem() const
 449 {
 450     if (!m_fileItem.isNull()) {
 451         return m_fileItem;
 452     }
 453
 454     if (!m_selection.isEmpty()) {
 455         Q_ASSERT(m_selection.count() == 1);
 456         return m_selection.first();
 457     }
 458
 459     // no item is hovered and no selection has been done: provide
 460     // an item for the directory represented by m_shownUrl
 461     KFileItem item(KFileItem::Unknown, KFileItem::Unknown, m_shownUrl);
 462     item.refresh();
 463     return item;
 464 }
 465
 466 bool InformationPanel::showMultipleSelectionInfo() const
 467 {
 468     return m_fileItem.isNull() && (m_selection.count() > 1);
 469 }
 470
 471 bool InformationPanel::isEqualToShownUrl(const KUrl& url) const
 472 {
 473     return m_shownUrl.equals(url, KUrl::CompareWithoutTrailingSlash);
 474 }
 475
 476 void InformationPanel::setNameLabelText(const QString& text)
 477 {
 478     QTextOption textOption;
 479     textOption.setWrapMode(QTextOption::WrapAtWordBoundaryOrAnywhere);
 480
 481     QTextLayout textLayout(text);
 482     textLayout.setFont(m_nameLabel->font());
 483     textLayout.setTextOption(textOption);
 484
 485     QString wrappedText;
 486     wrappedText.reserve(text.length());
 487
 488     // wrap the text to fit into the width of m_nameLabel
 489     textLayout.beginLayout();
 490     QTextLine line = textLayout.createLine();
 491     while (line.isValid()) {
 492         line.setLineWidth(m_nameLabel->width());
 493         wrappedText += text.mid(line.textStart(), line.textLength());
 494
 495         line = textLayout.createLine();
 496         if (line.isValid()) {
 497             wrappedText += QChar::LineSeparator;
 498         }
 499     }
 500     textLayout.endLayout();
 501
 502     m_nameLabel->setText(wrappedText);
 503 }
 504
 505 void InformationPanel::init()
 506 {
 507     const int spacing = KDialog::spacingHint();
 508
 509     m_infoTimer = new QTimer(this);
 510     m_infoTimer->setInterval(300);
 511     m_infoTimer->setSingleShot(true);
 512     connect(m_infoTimer, SIGNAL(timeout()),
 513             this, SLOT(slotInfoTimeout()));
 514
 515     // Initialize timer for disabling an outdated preview with a small
 516     // delay. This prevents flickering if the new preview can be generated
 517     // within a very small timeframe.
 518     m_outdatedPreviewTimer = new QTimer(this);
 519     m_outdatedPreviewTimer->setInterval(300);
 520     m_outdatedPreviewTimer->setSingleShot(true);
 521     connect(m_outdatedPreviewTimer, SIGNAL(timeout()),
 522             this, SLOT(markOutdatedPreview()));
 523
 524     QVBoxLayout* layout = new QVBoxLayout;
 525     layout->setSpacing(spacing);
 526
 527     // name
 528     m_nameLabel = new QLabel(this);
 529     QFont font = m_nameLabel->font();
 530     font.setBold(true);
 531     m_nameLabel->setFont(font);
 532     m_nameLabel->setAlignment(Qt::AlignHCenter);
 533     m_nameLabel->setSizePolicy(QSizePolicy::Preferred, QSizePolicy::Fixed);
 534
 535     // preview
 536     m_preview = new PixmapViewer(this);
 537     m_preview->setMinimumWidth(KIconLoader::SizeEnormous + KIconLoader::SizeMedium);
 538     m_preview->setMinimumHeight(KIconLoader::SizeEnormous);
 539
 540     if (MetaDataWidget::metaDataAvailable()) {
 541         // rating, comment and tags
 542         m_metaDataWidget = new MetaDataWidget(this);
 543         m_metaDataWidget->setSizePolicy(QSizePolicy::Preferred, QSizePolicy::Fixed);
 544     }
 545
 546     // general meta text information
 547     m_metaTextLabel = new MetaTextLabel(this);
 548     m_metaTextLabel->setSizePolicy(QSizePolicy::Preferred, QSizePolicy::Fixed);
 549
 550     m_metaTextArea = new QScrollArea(this);
 551     m_metaTextArea->setWidget(m_metaTextLabel);
 552     m_metaTextArea->setWidgetResizable(true);
 553     m_metaTextArea->setFrameShape(QFrame::NoFrame);
 554
 555     QWidget* viewport = m_metaTextArea->viewport();
 556     viewport->installEventFilter(this);
 557
 558     QPalette palette = viewport->palette();
 559     palette.setColor(viewport->backgroundRole(), QColor(Qt::transparent));
 560     viewport->setPalette(palette);
 561
 562     layout->addWidget(m_nameLabel);
 563     layout->addWidget(new KSeparator(this));
 564     layout->addWidget(m_preview);
 565     layout->addWidget(new KSeparator(this));
 566     if (m_metaDataWidget != 0) {
 567         layout->addWidget(m_metaDataWidget);
 568         layout->addWidget(new KSeparator(this));
 569     }
 570     layout->addWidget(m_metaTextArea);
 571     setLayout(layout);
 572
 573     org::kde::KDirNotify* dirNotify = new org::kde::KDirNotify(QString(), QString(),
 574                                                                QDBusConnection::sessionBus(), this);
 575     connect(dirNotify, SIGNAL(FileRenamed(QString, QString)), SLOT(slotFileRenamed(QString, QString)));
 576     connect(dirNotify, SIGNAL(FilesAdded(QString)), SLOT(slotFilesAdded(QString)));
 577     connect(dirNotify, SIGNAL(FilesChanged(QStringList)), SLOT(slotFilesChanged(QStringList)));
 578     connect(dirNotify, SIGNAL(FilesRemoved(QStringList)), SLOT(slotFilesRemoved(QStringList)));
 579     connect(dirNotify, SIGNAL(enteredDirectory(QString)), SLOT(slotEnteredDirectory(QString)));
 580     connect(dirNotify, SIGNAL(leftDirectory(QString)), SLOT(slotLeftDirectory(QString)));
 581
 582     m_initialized = true;
 583 }
 584
 585 #include "informationpanel.moc"