src/panels/information/informationpanelcontent.cpp

   1 /***************************************************************************
   2  *   Copyright (C) 2009 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 "informationpanelcontent.h"
  21
  22 #include <config-nepomuk.h>
  23
  24 #include <kdialog.h>
  25 #include <kfileitem.h>
  26 #include <kfileplacesmodel.h>
  27 #include <kio/previewjob.h>
  28 #include <kiconeffect.h>
  29 #include <kiconloader.h>
  30 #include <klocale.h>
  31 #include <kmenu.h>
  32 #include <kseparator.h>
  33
  34 #include <Phonon/BackendCapabilities>
  35 #include <Phonon/MediaObject>
  36 #include <Phonon/SeekSlider>
  37
  38 #include <QEvent>
  39 #include <QLabel>
  40 #include <QPixmap>
  41 #include <QResizeEvent>
  42 #include <QScrollArea>
  43 #include <QTextLayout>
  44 #include <QTextLine>
  45 #include <QTimer>
  46 #include <QVBoxLayout>
  47
  48 #include "dolphin_informationpanelsettings.h"
  49 #include "settings/dolphinsettings.h"
  50 #include "metadatawidget.h"
  51 #include "phononwidget.h"
  52 #include "pixmapviewer.h"
  53
  54 /**
  55  * Helper function for sorting items with qSort() in
  56  * InformationPanelContent::contextMenu().
  57  */
  58 bool lessThan(const QAction* action1, const QAction* action2)
  59 {
  60     return action1->text() < action2->text();
  61 }
  62
  63
  64 InformationPanelContent::InformationPanelContent(QWidget* parent) :
  65     Panel(parent),
  66     m_item(),
  67     m_pendingPreview(false),
  68     m_outdatedPreviewTimer(0),
  69     m_nameLabel(0),
  70     m_preview(0),
  71     m_previewSeparator(0),
  72     m_phononWidget(0),
  73     m_metaDataWidget(0),
  74     m_metaDataArea(0)
  75 {
  76     parent->installEventFilter(this);
  77
  78     // Initialize timer for disabling an outdated preview with a small
  79     // delay. This prevents flickering if the new preview can be generated
  80     // within a very small timeframe.
  81     m_outdatedPreviewTimer = new QTimer(this);
  82     m_outdatedPreviewTimer->setInterval(300);
  83     m_outdatedPreviewTimer->setSingleShot(true);
  84     connect(m_outdatedPreviewTimer, SIGNAL(timeout()),
  85             this, SLOT(markOutdatedPreview()));
  86
  87     QVBoxLayout* layout = new QVBoxLayout;
  88     layout->setSpacing(KDialog::spacingHint());
  89
  90     // name
  91     m_nameLabel = new QLabel(parent);
  92     QFont font = m_nameLabel->font();
  93     font.setBold(true);
  94     m_nameLabel->setFont(font);
  95     m_nameLabel->setAlignment(Qt::AlignHCenter);
  96     m_nameLabel->setSizePolicy(QSizePolicy::Preferred, QSizePolicy::Fixed);
  97     m_nameLabel->setMaximumWidth(KIconLoader::SizeEnormous);
  98
  99     // preview
 100     const int minPreviewWidth = KIconLoader::SizeEnormous + KIconLoader::SizeMedium;
 101
 102     m_preview = new PixmapViewer(parent);
 103     m_preview->setMinimumWidth(minPreviewWidth);
 104     m_preview->setMinimumHeight(KIconLoader::SizeEnormous);
 105
 106     m_phononWidget = new PhononWidget(parent);
 107     m_phononWidget->setMinimumWidth(minPreviewWidth);
 108     connect(m_phononWidget, SIGNAL(playingStarted()),
 109             this, SLOT(slotPlayingStarted()));
 110     connect(m_phononWidget, SIGNAL(playingStopped()),
 111             this, SLOT(slotPlayingStopped()));
 112
 113     m_previewSeparator = new KSeparator(parent);
 114
 115     const bool showPreview = InformationPanelSettings::showPreview();
 116     m_preview->setVisible(showPreview);
 117     m_previewSeparator->setVisible(showPreview);
 118
 119     m_metaDataWidget = new MetaDataWidget(parent);
 120     m_metaDataWidget->setSizePolicy(QSizePolicy::Preferred, QSizePolicy::Minimum);
 121
 122     // Encapsulate the MetaDataWidget inside a container that has a dummy widget
 123     // at the bottom. This prevents that the meta data widget gets vertically stretched
 124     // in the case where the height of m_metaDataArea > m_metaDataWidget.
 125     QWidget* metaDataWidgetContainer = new QWidget(parent);
 126     QVBoxLayout* containerLayout = new QVBoxLayout(metaDataWidgetContainer);
 127     containerLayout->setContentsMargins(0, 0, 0, 0);
 128     containerLayout->setSpacing(0);
 129     containerLayout->addWidget(m_metaDataWidget);
 130     QWidget* stretchWidget = new QWidget(metaDataWidgetContainer);
 131     stretchWidget->setSizePolicy(QSizePolicy::Preferred, QSizePolicy::MinimumExpanding);
 132     containerLayout->addWidget(stretchWidget);
 133
 134     m_metaDataArea = new QScrollArea(parent);
 135     m_metaDataArea->setWidget(metaDataWidgetContainer);
 136     m_metaDataArea->setWidgetResizable(true);
 137     m_metaDataArea->setFrameShape(QFrame::NoFrame);
 138
 139     QWidget* viewport = m_metaDataArea->viewport();
 140     viewport->installEventFilter(this);
 141
 142     QPalette palette = viewport->palette();
 143     palette.setColor(viewport->backgroundRole(), QColor(Qt::transparent));
 144     viewport->setPalette(palette);
 145
 146     layout->addWidget(m_nameLabel);
 147     layout->addWidget(new KSeparator(this));
 148     layout->addWidget(m_preview);
 149     layout->addWidget(m_phononWidget);
 150     layout->addWidget(m_previewSeparator);
 151     layout->addWidget(m_metaDataArea);
 152     parent->setLayout(layout);
 153 }
 154
 155 InformationPanelContent::~InformationPanelContent()
 156 {
 157     InformationPanelSettings::self()->writeConfig();
 158 }
 159
 160 void InformationPanelContent::showItem(const KFileItem& item)
 161 {
 162     m_pendingPreview = false;
 163
 164     const KUrl itemUrl = item.url();
 165     if (!applyPlace(itemUrl)) {
 166         // try to get a preview pixmap from the item...
 167         m_pendingPreview = true;
 168
 169         // Mark the currently shown preview as outdated. This is done
 170         // with a small delay to prevent a flickering when the next preview
 171         // can be shown within a short timeframe. This timer is not started
 172         // for directories, as directory previews might fail and return the
 173         // same icon.
 174         if (!item.isDir()) {
 175             m_outdatedPreviewTimer->start();
 176         }
 177
 178         KIO::PreviewJob* job = KIO::filePreview(KFileItemList() << item,
 179                                                 m_preview->width(),
 180                                                 m_preview->height(),
 181                                                 0,
 182                                                 0,
 183                                                 false,
 184                                                 true);
 185
 186         connect(job, SIGNAL(gotPreview(const KFileItem&, const QPixmap&)),
 187                 this, SLOT(showPreview(const KFileItem&, const QPixmap&)));
 188         connect(job, SIGNAL(failed(const KFileItem&)),
 189                 this, SLOT(showIcon(const KFileItem&)));
 190
 191         setNameLabelText(itemUrl.fileName());
 192     }
 193
 194     if (m_metaDataWidget != 0) {
 195         m_metaDataWidget->setItem(item);
 196     }
 197
 198     if (InformationPanelSettings::showPreview()) {
 199         const QString mimeType = item.mimetype();
 200         const bool usePhonon = Phonon::BackendCapabilities::isMimeTypeAvailable(mimeType) &&
 201                                (mimeType != "image/png");  // TODO: workaround, as Phonon
 202                                                            // thinks it supports PNG images
 203         if (usePhonon) {
 204             m_phononWidget->show();
 205             PhononWidget::Mode mode = mimeType.startsWith(QLatin1String("video"))
 206                                       ? PhononWidget::Video
 207                                       : PhononWidget::Audio;
 208             m_phononWidget->setMode(mode);
 209             m_phononWidget->setUrl(item.url());
 210             if ((mode == PhononWidget::Video) && m_preview->isVisible()) {
 211                 m_phononWidget->setVideoSize(m_preview->size());
 212             }
 213         } else {
 214             m_phononWidget->hide();
 215             m_preview->setVisible(true);
 216         }
 217     } else {
 218         m_phononWidget->hide();
 219     }
 220
 221     m_item = item;
 222 }
 223
 224 void InformationPanelContent::showItems(const KFileItemList& items)
 225 {
 226     m_pendingPreview = false;
 227
 228     KIconLoader iconLoader;
 229     QPixmap icon = iconLoader.loadIcon("dialog-information",
 230                                        KIconLoader::NoGroup,
 231                                        KIconLoader::SizeEnormous);
 232     m_preview->setPixmap(icon);
 233     setNameLabelText(i18ncp("@info", "%1 item selected", "%1 items selected", items.count()));
 234
 235     if (m_metaDataWidget != 0) {
 236         m_metaDataWidget->setItems(items);
 237     }
 238
 239     m_phononWidget->hide();
 240
 241     m_item = KFileItem();
 242 }
 243
 244 bool InformationPanelContent::eventFilter(QObject* obj, QEvent* event)
 245 {
 246     if (event->type() == QEvent::Resize) {
 247         QResizeEvent* resizeEvent = static_cast<QResizeEvent*>(event);
 248         if (obj == m_metaDataArea->viewport()) {
 249             // The size of the meta text area has changed. Adjust the fixed
 250             // width in a way that no horizontal scrollbar needs to be shown.
 251             m_metaDataWidget->setFixedWidth(resizeEvent->size().width());
 252         } else if (obj == parent()) {
 253             // If the text inside the name label or the info label cannot
 254             // get wrapped, then the maximum width of the label is increased
 255             // so that the width of the information panel gets increased.
 256             // To prevent this, the maximum width is adjusted to
 257             // the current width of the panel.
 258             const int maxWidth = resizeEvent->size().width() - KDialog::spacingHint() * 4;
 259             m_nameLabel->setMaximumWidth(maxWidth);
 260
 261             // The metadata widget also contains a text widget which may return
 262             // a large preferred width.
 263             if (m_metaDataWidget != 0) {
 264                 m_metaDataWidget->setMaximumWidth(maxWidth);
 265             }
 266
 267             // try to increase the preview as large as possible
 268             m_preview->setSizeHint(QSize(maxWidth, maxWidth));
 269
 270             if (m_phononWidget->isVisible() && (m_phononWidget->mode() == PhononWidget::Video)) {
 271                 // assure that the size of the video player is the same as the preview size
 272                 m_phononWidget->setVideoSize(QSize(maxWidth, maxWidth));
 273             }
 274         }
 275     }
 276     return Panel::eventFilter(obj, event);
 277 }
 278
 279 void InformationPanelContent::configureSettings()
 280 {
 281     if (m_item.isNull() ||
 282         !m_item.nepomukUri().isValid()) {
 283         return;
 284     }
 285
 286     KMenu popup(this);
 287
 288     QAction* previewAction = popup.addAction(i18nc("@action:inmenu", "Preview"));
 289     previewAction->setIcon(KIcon("view-preview"));
 290     previewAction->setCheckable(true);
 291     previewAction->setChecked(InformationPanelSettings::showPreview());
 292
 293     QAction* configureAction = popup.addAction(i18nc("@action:inmenu", "Configure..."));
 294     configureAction->setIcon(KIcon("configure"));
 295
 296     // Open the popup and adjust the settings for the
 297     // selected action.
 298     QAction* action = popup.exec(QCursor::pos());
 299     if (action == 0) {
 300         return;
 301     }
 302
 303     const bool isChecked = action->isChecked();
 304     if (action == previewAction) {
 305         m_preview->setVisible(isChecked);
 306         m_previewSeparator->setVisible(isChecked);
 307         InformationPanelSettings::setShowPreview(isChecked);
 308     } else if (action == configureAction) {
 309         m_metaDataWidget->openConfigurationDialog();
 310     }
 311
 312     showItem(m_item);
 313 }
 314
 315 void InformationPanelContent::showIcon(const KFileItem& item)
 316 {
 317     m_outdatedPreviewTimer->stop();
 318     m_pendingPreview = false;
 319     if (!applyPlace(item.url())) {
 320         m_preview->setPixmap(item.pixmap(KIconLoader::SizeEnormous));
 321     }
 322 }
 323
 324 void InformationPanelContent::showPreview(const KFileItem& item,
 325                                   const QPixmap& pixmap)
 326 {
 327     m_outdatedPreviewTimer->stop();
 328
 329     Q_UNUSED(item);
 330     if (m_pendingPreview) {
 331         m_preview->setPixmap(pixmap);
 332         m_pendingPreview = false;
 333     }
 334 }
 335
 336 void InformationPanelContent::markOutdatedPreview()
 337 {
 338     KIconEffect iconEffect;
 339     QPixmap disabledPixmap = iconEffect.apply(m_preview->pixmap(),
 340                                               KIconLoader::Desktop,
 341                                               KIconLoader::DisabledState);
 342     m_preview->setPixmap(disabledPixmap);
 343 }
 344
 345 void InformationPanelContent::slotPlayingStarted()
 346 {
 347     m_preview->setVisible(m_phononWidget->mode() != PhononWidget::Video);
 348 }
 349
 350 void InformationPanelContent::slotPlayingStopped()
 351 {
 352     m_preview->setVisible(true);
 353 }
 354
 355 bool InformationPanelContent::applyPlace(const KUrl& url)
 356 {
 357     KFilePlacesModel* placesModel = DolphinSettings::instance().placesModel();
 358     int count = placesModel->rowCount();
 359
 360     for (int i = 0; i < count; ++i) {
 361         QModelIndex index = placesModel->index(i, 0);
 362
 363         if (url.equals(placesModel->url(index), KUrl::CompareWithoutTrailingSlash)) {
 364             setNameLabelText(placesModel->text(index));
 365             m_preview->setPixmap(placesModel->icon(index).pixmap(128, 128));
 366             return true;
 367         }
 368     }
 369
 370     return false;
 371 }
 372
 373 void InformationPanelContent::setNameLabelText(const QString& text)
 374 {
 375     QTextOption textOption;
 376     textOption.setWrapMode(QTextOption::WrapAtWordBoundaryOrAnywhere);
 377
 378     QTextLayout textLayout(text);
 379     textLayout.setFont(m_nameLabel->font());
 380     textLayout.setTextOption(textOption);
 381
 382     QString wrappedText;
 383     wrappedText.reserve(text.length());
 384
 385     // wrap the text to fit into the width of m_nameLabel
 386     textLayout.beginLayout();
 387     QTextLine line = textLayout.createLine();
 388     while (line.isValid()) {
 389         line.setLineWidth(m_nameLabel->width());
 390         wrappedText += text.mid(line.textStart(), line.textLength());
 391
 392         line = textLayout.createLine();
 393         if (line.isValid()) {
 394             wrappedText += QChar::LineSeparator;
 395         }
 396     }
 397     textLayout.endLayout();
 398
 399     m_nameLabel->setText(wrappedText);
 400 }
 401
 402 #include "informationpanelcontent.moc"