src/kitemviews/kfileitemlistview.h

   1 /***************************************************************************
   2  *   Copyright (C) 2011 by Peter Penz <peter.penz19@gmail.com>             *
   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 KFILEITEMLISTVIEW_H
  21 #define KFILEITEMLISTVIEW_H
  22
  23 #include <libdolphin_export.h>
  24
  25 #include <kitemviews/kitemlistview.h>
  26
  27 class KFileItemModelRolesUpdater;
  28 class QTimer;
  29
  30 /**
  31  * @brief View that allows to show the content of file-items.
  32  *
  33  * The corresponding model set by the controller must be an instance
  34  * of KFileItemModel. Per default KFileItemListWidget is set as widget creator
  35  * value and KItemListGroupHeader as group-header creator value. Use
  36  * KItemListView::setWidgetCreator() and KItemListView::setGroupHeaderCreator()
  37  * to apply customized generators.
  38  */
  39 class LIBDOLPHINPRIVATE_EXPORT KFileItemListView : public KItemListView
  40 {
  41     Q_OBJECT
  42
  43 public:
  44     enum Layout
  45     {
  46         IconsLayout,
  47         CompactLayout,
  48         DetailsLayout
  49     };
  50
  51     KFileItemListView(QGraphicsWidget* parent = 0);
  52     virtual ~KFileItemListView();
  53
  54     void setPreviewsShown(bool show);
  55     bool previewsShown() const;
  56
  57     void setItemLayout(Layout layout);
  58     Layout itemLayout() const;
  59
  60     /**
  61      * Sets the list of enabled thumbnail plugins that are used for previews.
  62      * Per default all plugins enabled in the KConfigGroup "PreviewSettings"
  63      * are used.
  64      *
  65      * For a list of available plugins, call KServiceTypeTrader::self()->query("ThumbCreator").
  66      *
  67      * @see enabledPlugins
  68      */
  69     void setEnabledPlugins(const QStringList& list);
  70
  71     /**
  72      * Returns the list of enabled thumbnail plugins.
  73      * @see setEnabledPlugins
  74      */
  75     QStringList enabledPlugins() const;
  76
  77     /** @reimp */
  78     virtual QSizeF itemSizeHint(int index) const;
  79
  80     /** @reimp */
  81     qreal preferredColumnWidth(int index, const QByteArray& role) const;
  82
  83     /** @reimp */
  84     virtual QPixmap createDragPixmap(const QSet<int>& indexes) const;
  85
  86 protected:
  87     virtual void initializeItemListWidget(KItemListWidget* item);
  88     virtual bool itemSizeHintUpdateRequired(const QSet<QByteArray>& changedRoles) const;
  89     virtual void onModelChanged(KItemModelBase* current, KItemModelBase* previous);
  90     virtual void onScrollOrientationChanged(Qt::Orientation current, Qt::Orientation previous);
  91     virtual void onItemSizeChanged(const QSizeF& current, const QSizeF& previous);
  92     virtual void onScrollOffsetChanged(qreal current, qreal previous);
  93     virtual void onVisibleRolesChanged(const QList<QByteArray>& current, const QList<QByteArray>& previous);
  94     virtual void onStyleOptionChanged(const KItemListStyleOption& current, const KItemListStyleOption& previous);
  95     virtual void onSupportsItemExpandingChanged(bool supportsExpanding);
  96     virtual void onTransactionBegin();
  97     virtual void onTransactionEnd();
  98     virtual void resizeEvent(QGraphicsSceneResizeEvent* event);
  99
 100 protected slots:
 101     virtual void slotItemsRemoved(const KItemRangeList& itemRanges);
 102     virtual void slotSortRoleChanged(const QByteArray& current, const QByteArray& previous);
 103
 104 private slots:
 105     void triggerVisibleIndexRangeUpdate();
 106     void updateVisibleIndexRange();
 107
 108     void triggerIconSizeUpdate();
 109     void updateIconSize();
 110
 111 private:
 112     void updateLayoutOfVisibleItems();
 113     void updateTimersInterval();
 114     void updateMinimumRolesWidths();
 115
 116     /**
 117      * Applies the roles defined by KItemListView::visibleRoles() to the
 118      * KFileItemModel and KFileItemModelRolesUpdater. As the model does not
 119      * distinct between visible and invisible roles also internal roles
 120      * are applied that are mandatory for having a working KFileItemModel.
 121      */
 122     void applyRolesToModel();
 123
 124     /**
 125      * @return Size that is available for the icons. The size might be larger than specified by
 126      *         KItemListStyleOption::iconSize: With the IconsLayout also the empty left area left
 127      *         and right of an icon will be included.
 128      */
 129     QSize availableIconSize() const;
 130
 131 private:
 132     Layout m_itemLayout;
 133
 134     KFileItemModelRolesUpdater* m_modelRolesUpdater;
 135     QTimer* m_updateVisibleIndexRangeTimer;
 136     QTimer* m_updateIconSizeTimer;
 137
 138     // Cache for calculating visibleRoleSizes() in a fast way
 139     QHash<QByteArray, int> m_minimumRolesWidths;
 140
 141     friend class KFileItemListViewTest; // For unit testing
 142 };
 143
 144 #endif
 145
 146