src/panels/information/informationpanel.h

   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 #ifndef INFORMATIONPANEL_H
  21 #define INFORMATIONPANEL_H
  22
  23 #include <panels/panel.h>
  24 #include <panels/information/informationpaneldialog.h>
  25
  26 #include <QPushButton>
  27 #include <QPixmap>
  28 #include <QEvent>
  29 #include <QLabel>
  30 #include <QList>
  31 #include <QPointer>
  32
  33 #include <kurl.h>
  34 #include <kmimetype.h>
  35 #include <kdesktopfileactions.h>
  36 #include <kvbox.h>
  37
  38 class InformationPanelDialog;
  39 class PhononWidget;
  40 class PixmapViewer;
  41 class MetaDataWidget;
  42 class MetaTextLabel;
  43 class QPixmap;
  44 class QString;
  45 class KFileItem;
  46 class QLabel;
  47 class QScrollArea;
  48
  49 /**
  50  * @brief Panel for showing meta information of one ore more selected items.
  51  */
  52 class InformationPanel : public Panel
  53 {
  54     Q_OBJECT
  55
  56 public:
  57     explicit InformationPanel(QWidget* parent = 0);
  58     virtual ~InformationPanel();
  59
  60     /** @see QWidget::sizeHint() */
  61     virtual QSize sizeHint() const;
  62
  63 public slots:
  64     /** @see Panel::setUrl() */
  65     virtual void setUrl(const KUrl& url);
  66
  67     /**
  68      * This is invoked to inform the panel that the user has selected a new
  69      * set of items.
  70      */
  71     void setSelection(const KFileItemList& selection);
  72
  73     /**
  74      * Does a delayed request of information for the item \a item.
  75      * If within this delay InformationPanel::setUrl() or InformationPanel::setSelection()
  76      * are invoked, then the request will be skipped. Requesting a delayed item information
  77      * makes sense when hovering items.
  78      */
  79     void requestDelayedItemInfo(const KFileItem& item);
  80
  81 protected:
  82     /** @see QWidget::showEvent() */
  83     virtual void showEvent(QShowEvent* event);
  84
  85     /** @see QWidget::resizeEvent() */
  86     virtual void resizeEvent(QResizeEvent* event);
  87
  88     /** @see QObject::eventFilter() */
  89     virtual bool eventFilter(QObject* obj, QEvent* event);
  90
  91     /** @see QWidget::contextMenuEvent() */
  92     virtual void contextMenuEvent(QContextMenuEvent* event);
  93
  94 private slots:
  95     /**
  96      * Shows the information for the item of the URL which has been provided by
  97      * InformationPanel::requestItemInfo() and provides default actions.
  98      */
  99     void showItemInfo();
 100
 101     /**
 102      * Triggered if the request for item information has timed out.
 103      * @see InformationPanel::requestDelayedItemInfo()
 104      */
 105     void slotInfoTimeout();
 106
 107     /**
 108      * Marks the currently shown preview as outdated
 109      * by greying the content.
 110      */
 111     void markOutdatedPreview();
 112
 113     /**
 114      * Is invoked if no preview is available for the item. In this
 115      * case the icon will be shown.
 116      */
 117     void showIcon(const KFileItem& item);
 118
 119     /**
 120      * Is invoked if a preview is available for the item. The preview
 121      * \a pixmap is shown inside the info page.
 122      */
 123     void showPreview(const KFileItem& item, const QPixmap& pixmap);
 124
 125     void slotFileRenamed(const QString& source, const QString& dest);
 126     void slotFilesAdded(const QString& directory);
 127     void slotFilesChanged(const QStringList& files);
 128     void slotFilesRemoved(const QStringList& files);
 129     void slotEnteredDirectory(const QString& directory);
 130     void slotLeftDirectory(const QString& directory);
 131
 132 private:
 133     /**
 134      * Checks whether the an URL is repesented by a place. If yes,
 135      * then the place icon and name are shown instead of a preview.
 136      * @return True, if the URL represents exactly a place.
 137      * @param url The url to check.
 138      */
 139     bool applyPlace(const KUrl& url);
 140
 141     /** Assures that any pending item information request is cancelled. */
 142     void cancelRequest();
 143
 144     /**
 145      * Shows the meta information for the current shown item inside
 146      * a label.
 147      */
 148     void showMetaInfo();
 149
 150     /**
 151      * Returns the item for file where the preview and meta information
 152      * should be received, if InformationPanel::showMultipleSelectionInfo()
 153      * returns false.
 154      */
 155     KFileItem fileItem() const;
 156
 157     /**
 158      * Returns true, if the meta information should be shown for
 159      * the multiple selected items that are stored in
 160      * m_selection. If true is returned, it is assured that
 161      * m_selection.count() > 1. If false is returned, the meta
 162      * information should be shown for the file
 163      * InformationPanel::fileUrl();
 164      */
 165     bool showMultipleSelectionInfo() const;
 166
 167     /**
 168      * Returns true, if \a url is equal to the shown URL m_shownUrl.
 169      */
 170     bool isEqualToShownUrl(const KUrl& url) const;
 171
 172     /**
 173      * Sets the text for the label \a m_nameLabel and assures that the
 174      * text is split in a way that it can be wrapped within the
 175      * label width (QLabel::setWordWrap() does not work if the
 176      * text represents one extremely long word).
 177      */
 178     void setNameLabelText(const QString& text);
 179
 180     /**
 181      * Resets the information panel to show the current
 182      * URL (InformationPanel::url()).
 183      */
 184     void reset();
 185
 186     void init();
 187
 188 private:
 189     bool m_initialized;
 190     bool m_pendingPreview;
 191     QTimer* m_infoTimer;
 192     QTimer* m_outdatedPreviewTimer;
 193     KUrl m_shownUrl;      // URL that is shown as info
 194     KUrl m_urlCandidate;  // URL candidate that will replace m_shownURL after a delay
 195     KFileItem m_fileItem; // file item for m_shownUrl if available (otherwise null)
 196     KFileItemList m_selection;
 197
 198     QLabel* m_nameLabel;
 199     PixmapViewer* m_preview;
 200     PhononWidget* m_phononWidget;
 201     MetaDataWidget* m_metaDataWidget;
 202
 203     QScrollArea* m_metaTextArea;
 204     MetaTextLabel* m_metaTextLabel;
 205
 206     QPointer<InformationPanelDialog> m_dialog;
 207 };
 208
 209 #endif // INFORMATIONPANEL_H