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