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  97      * Marks the currently shown preview as outdated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