apps/dolphin/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 #include <QEvent>
  38 #include <QInputDialog>
  39 #include <QLabel>
  40 #include <QPainter>
  41 #include <QPixmap>
  42 #include <QResizeEvent>
  43 #include <QTextLayout>
  44 #include <QTextLine>
  45 #include <QTimer>
  46 #include <QVBoxLayout>
  47
  48 #include "settings/dolphinsettings.h"
  49 #include "metadatawidget.h"
  50 #include "metatextlabel.h"
  51 #include "pixmapviewer.h"
  52
  53 InformationPanel::InformationPanel(QWidget* parent) :
  54     Panel(parent),
  55     m_initialized(false),
  56     m_pendingPreview(false),
  57     m_infoTimer(0),
  58     m_outdatedPreviewTimer(0),
  59     m_shownUrl(),
  60     m_urlCandidate(),
  61     m_fileItem(),
  62     m_selection(),
  63     m_nameLabel(0),
  64     m_preview(0),
  65     m_metaDataWidget(0),
  66     m_metaTextLabel(0)
  67 {
  68 }
  69
  70 InformationPanel::~InformationPanel()
  71 {
  72 }
  73
  74 QSize InformationPanel::sizeHint() const
  75 {
  76     QSize size = Panel::sizeHint();
  77     size.setWidth(minimumSizeHint().width());
  78     return size;
  79 }
  80
  81 void InformationPanel::setUrl(const KUrl& url)
  82 {
  83     Panel::setUrl(url);
  84     if (url.isValid() && !isEqualToShownUrl(url)) {
  85         if (isVisible()) {
  86             cancelRequest();
  87             m_shownUrl = url;
  88             showItemInfo();
  89         } else {
  90             m_shownUrl = url;
  91         }
  92     }
  93 }
  94
  95 void InformationPanel::setSelection(const KFileItemList& selection)
  96 {
  97     if (!isVisible()) {
  98         return;
  99     }
 100
 101     if ((selection.count() == 0) && (m_selection.count() == 0)) {
 102         // The selection has not really changed, only the current index.
 103         // QItemSelectionModel emits a signal in this case and it is less
 104         // expensive doing the check this way instead of patching
 105         // DolphinView::emitSelectionChanged().
 106         return;
 107     }
 108
 109     m_selection = selection;
 110
 111     const int count = selection.count();
 112     if (count == 0) {
 113         if (!isEqualToShownUrl(url())) {
 114             m_shownUrl = url();
 115             showItemInfo();
 116         }
 117     } else {
 118         if ((count == 1) && !selection.first().url().isEmpty()) {
 119             m_urlCandidate = selection.first().url();
 120         }
 121         m_infoTimer->start();
 122     }
 123 }
 124
 125 void InformationPanel::requestDelayedItemInfo(const KFileItem& item)
 126 {
 127     if (!isVisible()) {
 128         return;
 129     }
 130
 131     cancelRequest();
 132
 133     m_fileItem = KFileItem();
 134     if (item.isNull()) {
 135         // The cursor is above the viewport. If files are selected,
 136         // show information regarding the selection.
 137         if (m_selection.size() > 0) {
 138             m_pendingPreview = false;
 139             m_infoTimer->start();
 140         }
 141     } else {
 142         const KUrl url = item.url();
 143         if (url.isValid() && !isEqualToShownUrl(url)) {
 144             m_urlCandidate = item.url();
 145             m_fileItem = item;
 146             m_infoTimer->start();
 147         }
 148     }
 149 }
 150
 151 void InformationPanel::showEvent(QShowEvent* event)
 152 {
 153     Panel::showEvent(event);
 154     if (!event->spontaneous()) {
 155         if (!m_initialized) {
 156             // do a delayed initialization so that no performance
 157             // penalty is given when Dolphin is started with a closed
 158             // Information Panel
 159             init();
 160         }
 161         showItemInfo();
 162     }
 163 }
 164
 165 void InformationPanel::resizeEvent(QResizeEvent* event)
 166 {
 167     if (isVisible()) {
 168         // If the text inside the name label or the info label cannot
 169         // get wrapped, then the maximum width of the label is increased
 170         // so that the width of the information panel gets increased.
 171         // To prevent this, the maximum width is adjusted to
 172         // the current width of the panel.
 173         const int maxWidth = event->size().width() - KDialog::spacingHint() * 4;
 174         m_nameLabel->setMaximumWidth(maxWidth);
 175
 176         // try to increase the preview as large as possible
 177         m_preview->setSizeHint(QSize(maxWidth, maxWidth));
 178         m_urlCandidate = m_shownUrl; // reset the URL candidate if a resizing is done
 179         m_infoTimer->start();
 180     }
 181
 182     Panel::resizeEvent(event);
 183 }
 184
 185 void InformationPanel::showItemInfo()
 186 {
 187     if (!isVisible()) {
 188         return;
 189     }
 190
 191     cancelRequest();
 192
 193     if (showMultipleSelectionInfo()) {
 194         KIconLoader iconLoader;
 195         QPixmap icon = iconLoader.loadIcon("dialog-information",
 196                                            KIconLoader::NoGroup,
 197                                            KIconLoader::SizeEnormous);
 198         m_preview->setPixmap(icon);
 199         setNameLabelText(i18ncp("@info", "%1 item selected", "%1 items selected",  m_selection.count()));
 200         m_shownUrl = KUrl();
 201     } else {
 202         const KFileItem item = fileItem();
 203         const KUrl itemUrl = item.url();
 204         if (!applyPlace(itemUrl)) {
 205             // try to get a preview pixmap from the item...
 206             m_pendingPreview = true;
 207
 208             // Mark the currently shown preview as outdated. This is done
 209             // with a small delay to prevent a flickering when the next preview
 210             // can be shown within a short timeframe.
 211             m_outdatedPreviewTimer->start();
 212
 213             KIO::PreviewJob* job = KIO::filePreview(KFileItemList() << item,
 214                                                     m_preview->width(),
 215                                                     m_preview->height(),
 216                                                     0,
 217                                                     0,
 218                                                     false,
 219                                                     true);
 220
 221             connect(job, SIGNAL(gotPreview(const KFileItem&, const QPixmap&)),
 222                     this, SLOT(showPreview(const KFileItem&, const QPixmap&)));
 223             connect(job, SIGNAL(failed(const KFileItem&)),
 224                     this, SLOT(showIcon(const KFileItem&)));
 225
 226             setNameLabelText(itemUrl.fileName());
 227         }
 228     }
 229
 230     showMetaInfo();
 231 }
 232
 233 void InformationPanel::slotInfoTimeout()
 234 {
 235     m_shownUrl = m_urlCandidate;
 236     showItemInfo();
 237 }
 238
 239 void InformationPanel::markOutdatedPreview()
 240 {
 241     KIconEffect iconEffect;
 242     QPixmap disabledPixmap = iconEffect.apply(m_preview->pixmap(),
 243                                               KIconLoader::Desktop,
 244                                               KIconLoader::DisabledState);
 245     m_preview->setPixmap(disabledPixmap);
 246 }
 247
 248 void InformationPanel::showIcon(const KFileItem& item)
 249 {
 250     m_outdatedPreviewTimer->stop();
 251     m_pendingPreview = false;
 252     if (!applyPlace(item.url())) {
 253         m_preview->setPixmap(item.pixmap(KIconLoader::SizeEnormous));
 254     }
 255 }
 256
 257 void InformationPanel::showPreview(const KFileItem& item,
 258                                   const QPixmap& pixmap)
 259 {
 260     m_outdatedPreviewTimer->stop();
 261
 262     Q_UNUSED(item);
 263     if (m_pendingPreview) {
 264         m_preview->setPixmap(pixmap);
 265         m_pendingPreview = false;
 266     }
 267 }
 268
 269 void InformationPanel::slotFileRenamed(const QString& source, const QString& dest)
 270 {
 271     if (m_shownUrl == KUrl(source)) {
 272         // the currently shown file has been renamed, hence update the item information
 273         // for the renamed file
 274         KFileItem item(KFileItem::Unknown, KFileItem::Unknown, KUrl(dest));
 275         requestDelayedItemInfo(item);
 276     }
 277 }
 278
 279 void InformationPanel::slotFilesAdded(const QString& directory)
 280 {
 281     if (m_shownUrl == KUrl(directory)) {
 282         // If the 'trash' icon changes because the trash has been emptied or got filled,
 283         // the signal filesAdded("trash:/") will be emitted.
 284         KFileItem item(KFileItem::Unknown, KFileItem::Unknown, KUrl(directory));
 285         requestDelayedItemInfo(item);
 286     }
 287 }
 288
 289 void InformationPanel::slotFilesChanged(const QStringList& files)
 290 {
 291     foreach (const QString& fileName, files) {
 292         if (m_shownUrl == KUrl(fileName)) {
 293             showItemInfo();
 294             break;
 295         }
 296     }
 297 }
 298
 299 void InformationPanel::slotFilesRemoved(const QStringList& files)
 300 {
 301     foreach (const QString& fileName, files) {
 302         if (m_shownUrl == KUrl(fileName)) {
 303             // the currently shown item has been removed, show
 304             // the parent directory as fallback
 305             m_shownUrl = url();
 306             showItemInfo();
 307             break;
 308         }
 309     }
 310 }
 311
 312 void InformationPanel::slotEnteredDirectory(const QString& directory)
 313 {
 314     if (m_shownUrl == KUrl(directory)) {
 315         KFileItem item(KFileItem::Unknown, KFileItem::Unknown, KUrl(directory));
 316         requestDelayedItemInfo(item);
 317     }
 318 }
 319
 320 void InformationPanel::slotLeftDirectory(const QString& directory)
 321 {
 322     if (m_shownUrl == KUrl(directory)) {
 323         // The signal 'leftDirectory' is also emitted when a media
 324         // has been unmounted. In this case no directory change will be
 325         // done in Dolphin, but the Information Panel must be updated to
 326         // indicate an invalid directory.
 327         m_shownUrl = url();
 328         showItemInfo();
 329     }
 330 }
 331
 332 bool InformationPanel::applyPlace(const KUrl& url)
 333 {
 334     KFilePlacesModel* placesModel = DolphinSettings::instance().placesModel();
 335     int count = placesModel->rowCount();
 336
 337     for (int i = 0; i < count; ++i) {
 338         QModelIndex index = placesModel->index(i, 0);
 339
 340         if (url.equals(placesModel->url(index), KUrl::CompareWithoutTrailingSlash)) {
 341             setNameLabelText(placesModel->text(index));
 342             m_preview->setPixmap(placesModel->icon(index).pixmap(128, 128));
 343             return true;
 344         }
 345     }
 346
 347     return false;
 348 }
 349
 350 void InformationPanel::cancelRequest()
 351 {
 352     m_infoTimer->stop();
 353 }
 354
 355 void InformationPanel::showMetaInfo()
 356 {
 357     m_metaTextLabel->clear();
 358
 359     if (showMultipleSelectionInfo()) {
 360         if (m_metaDataWidget != 0) {
 361             KUrl::List urls;
 362             foreach (const KFileItem& item, m_selection) {
 363                 urls.append(item.targetUrl());
 364             }
 365             m_metaDataWidget->setFiles(urls);
 366         }
 367
 368         quint64 totalSize = 0;
 369         foreach (const KFileItem& item, m_selection) {
 370             // Only count the size of files, not dirs to match what
 371             // DolphinViewContainer::selectionStatusBarText() does.
 372             if (!item.isDir() && !item.isLink()) {
 373                 totalSize += item.size();
 374             }
 375         }
 376         m_metaTextLabel->add(i18nc("@label", "Total size:"), KIO::convertSize(totalSize));
 377     } else {
 378         const KFileItem item = fileItem();
 379         if (item.isDir()) {
 380             m_metaTextLabel->add(i18nc("@label", "Type:"), i18nc("@label", "Folder"));
 381             m_metaTextLabel->add(i18nc("@label", "Modified:"), item.timeString());
 382         } else {
 383             m_metaTextLabel->add(i18nc("@label", "Type:"), item.mimeComment());
 384
 385             m_metaTextLabel->add(i18nc("@label", "Size:"), KIO::convertSize(item.size()));
 386             m_metaTextLabel->add(i18nc("@label", "Modified:"), item.timeString());
 387
 388             if (item.isLocalFile()) {
 389                 // TODO: See convertMetaInfo below, find a way to display only interesting information
 390                 // in a readable way
 391                 const KFileMetaInfo::WhatFlags flags = KFileMetaInfo::Fastest |
 392                                                        KFileMetaInfo::TechnicalInfo |
 393                                                        KFileMetaInfo::ContentInfo;
 394                 const QString path = item.url().path();
 395                 const KFileMetaInfo fileMetaInfo(path, QString(), flags);
 396                 if (fileMetaInfo.isValid()) {
 397                     const QHash<QString, KFileMetaInfoItem>& items = fileMetaInfo.items();
 398                     QHash<QString, KFileMetaInfoItem>::const_iterator it = items.constBegin();
 399                     const QHash<QString, KFileMetaInfoItem>::const_iterator end = items.constEnd();
 400                     QString labelText;
 401                     while (it != end) {
 402                         const KFileMetaInfoItem& metaInfoItem = it.value();
 403                         const QVariant& value = metaInfoItem.value();
 404                         if (value.isValid() && convertMetaInfo(metaInfoItem.name(), labelText)) {
 405                             m_metaTextLabel->add(labelText, value.toString());
 406                         }
 407                         ++it;
 408                     }
 409                 }
 410             }
 411         }
 412
 413         if (m_metaDataWidget != 0) {
 414             m_metaDataWidget->setFile(item.targetUrl());
 415         }
 416     }
 417 }
 418
 419 bool InformationPanel::convertMetaInfo(const QString& key, QString& text) const
 420 {
 421     struct MetaKey {
 422         const char* key;
 423         QString text;
 424     };
 425
 426     // sorted list of keys, where its data should be shown
 427     static const MetaKey keys[] = {
 428         { "http://freedesktop.org/standards/xesam/1.0/core#album",       i18nc("@label", "Album:") },
 429         { "http://freedesktop.org/standards/xesam/1.0/core#artist",      i18nc("@label", "Artist:") },
 430         { "http://freedesktop.org/standards/xesam/1.0/core#genre",       i18nc("@label", "Genre:") },
 431         { "http://freedesktop.org/standards/xesam/1.0/core#height",      i18nc("@label", "Height:") },
 432         { "http://freedesktop.org/standards/xesam/1.0/core#lineCount",   i18nc("@label", "Lines:") },
 433         { "http://freedesktop.org/standards/xesam/1.0/core#title",       i18nc("@label", "Title:") },
 434         { "http://freedesktop.org/standards/xesam/1.0/core#type",        i18nc("@label", "Type:") },
 435         { "http://freedesktop.org/standards/xesam/1.0/core#trackNumber", i18nc("@label", "Track:") },
 436         { "http://freedesktop.org/standards/xesam/1.0/core#width",       i18nc("@label", "Width:") }
 437     };
 438
 439     // do a binary search for the key...
 440     int top = 0;
 441     int bottom = sizeof(keys) / sizeof(MetaKey) - 1;
 442     while (top <= bottom) {
 443         const int middle = (top + bottom) / 2;
 444         const int result = key.compare(keys[middle].key);
 445         if (result < 0) {
 446             bottom = middle - 1;
 447         } else if (result > 0) {
 448             top = middle + 1;
 449         } else {
 450             text = keys[middle].text;
 451             return true;
 452         }
 453     }
 454
 455     return false;
 456 }
 457
 458 KFileItem InformationPanel::fileItem() const
 459 {
 460     if (!m_fileItem.isNull()) {
 461         return m_fileItem;
 462     }
 463
 464     if (!m_selection.isEmpty()) {
 465         Q_ASSERT(m_selection.count() == 1);
 466         return m_selection.first();
 467     }
 468
 469     // no item is hovered and no selection has been done: provide
 470     // an item for the directory represented by m_shownUrl
 471     KFileItem item(KFileItem::Unknown, KFileItem::Unknown, m_shownUrl);
 472     item.refresh();
 473     return item;
 474 }
 475
 476 bool InformationPanel::showMultipleSelectionInfo() const
 477 {
 478     return m_fileItem.isNull() && (m_selection.count() > 1);
 479 }
 480
 481 bool InformationPanel::isEqualToShownUrl(const KUrl& url) const
 482 {
 483     return m_shownUrl.equals(url, KUrl::CompareWithoutTrailingSlash);
 484 }
 485
 486 void InformationPanel::setNameLabelText(const QString& text)
 487 {
 488     QTextOption textOption;
 489     textOption.setWrapMode(QTextOption::WrapAtWordBoundaryOrAnywhere);
 490
 491     QTextLayout textLayout(text);
 492     textLayout.setFont(m_nameLabel->font());
 493     textLayout.setTextOption(textOption);
 494
 495     QString wrappedText;
 496     wrappedText.reserve(text.length());
 497
 498     // wrap the text to fit into the width of m_nameLabel
 499     textLayout.beginLayout();
 500     QTextLine line = textLayout.createLine();
 501     while (line.isValid()) {
 502         line.setLineWidth(m_nameLabel->width());
 503         wrappedText += text.mid(line.textStart(), line.textLength());
 504
 505         line = textLayout.createLine();
 506         if (line.isValid()) {
 507             wrappedText += QChar::LineSeparator;
 508         }
 509     }
 510     textLayout.endLayout();
 511
 512     m_nameLabel->setText(wrappedText);
 513 }
 514
 515 void InformationPanel::init()
 516 {
 517     const int spacing = KDialog::spacingHint();
 518
 519     m_infoTimer = new QTimer(this);
 520     m_infoTimer->setInterval(300);
 521     m_infoTimer->setSingleShot(true);
 522     connect(m_infoTimer, SIGNAL(timeout()),
 523             this, SLOT(slotInfoTimeout()));
 524
 525     // Initialize timer for disabling an outdated preview with a small
 526     // delay. This prevents flickering if the new preview can be generated
 527     // within a very small timeframe.
 528     m_outdatedPreviewTimer = new QTimer(this);
 529     m_outdatedPreviewTimer->setInterval(300);
 530     m_outdatedPreviewTimer->setSingleShot(true);
 531     connect(m_outdatedPreviewTimer, SIGNAL(timeout()),
 532             this, SLOT(markOutdatedPreview()));
 533
 534     QVBoxLayout* layout = new QVBoxLayout;
 535     layout->setSpacing(spacing);
 536
 537     // name
 538     m_nameLabel = new QLabel(this);
 539     QFont font = m_nameLabel->font();
 540     font.setBold(true);
 541     m_nameLabel->setFont(font);
 542     m_nameLabel->setAlignment(Qt::AlignHCenter);
 543     m_nameLabel->setSizePolicy(QSizePolicy::Preferred, QSizePolicy::Fixed);
 544
 545     // preview
 546     m_preview = new PixmapViewer(this);
 547     m_preview->setMinimumWidth(KIconLoader::SizeEnormous + KIconLoader::SizeMedium);
 548     m_preview->setMinimumHeight(KIconLoader::SizeEnormous);
 549
 550     if (MetaDataWidget::metaDataAvailable()) {
 551         // rating, comment and tags
 552         m_metaDataWidget = new MetaDataWidget(this);
 553         m_metaDataWidget->setSizePolicy(QSizePolicy::Preferred, QSizePolicy::Fixed);
 554     }
 555
 556     // general meta text information
 557     m_metaTextLabel = new MetaTextLabel(this);
 558     m_metaTextLabel->setMinimumWidth(spacing);
 559     m_metaTextLabel->setSizePolicy(QSizePolicy::Preferred, QSizePolicy::Fixed);
 560
 561     layout->addWidget(m_nameLabel);
 562     layout->addWidget(new KSeparator(this));
 563     layout->addWidget(m_preview);
 564     layout->addWidget(new KSeparator(this));
 565     if (m_metaDataWidget != 0) {
 566         layout->addWidget(m_metaDataWidget);
 567         layout->addWidget(new KSeparator(this));
 568     }
 569     layout->addWidget(m_metaTextLabel);
 570
 571     // ensure that widgets in the information side bar are aligned towards the top
 572     layout->addStretch(1);
 573     setLayout(layout);
 574
 575     org::kde::KDirNotify* dirNotify = new org::kde::KDirNotify(QString(), QString(),
 576                                                                QDBusConnection::sessionBus(), this);
 577     connect(dirNotify, SIGNAL(FileRenamed(QString, QString)), SLOT(slotFileRenamed(QString, QString)));
 578     connect(dirNotify, SIGNAL(FilesAdded(QString)), SLOT(slotFilesAdded(QString)));
 579     connect(dirNotify, SIGNAL(FilesChanged(QStringList)), SLOT(slotFilesChanged(QStringList)));
 580     connect(dirNotify, SIGNAL(FilesRemoved(QStringList)), SLOT(slotFilesRemoved(QStringList)));
 581     connect(dirNotify, SIGNAL(enteredDirectory(QString)), SLOT(slotEnteredDirectory(QString)));
 582     connect(dirNotify, SIGNAL(leftDirectory(QString)), SLOT(slotLeftDirectory(QString)));
 583
 584     m_initialized = true;
 585 }
 586
 587 #include "informationpanel.moc"