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  79     // Initialize timer for disabling an outdated preview with a small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