src/dolphincolumnview.h

   1 /***************************************************************************
   2  *   Copyright (C) 2007 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 DOLPHINCOLUMNVIEW_H
  21 #define DOLPHINCOLUMNVIEW_H
  22
  23 #include <QAbstractItemView>
  24 #include <QList>
  25 #include <QStyleOption>
  26
  27 class ColumnWidget;
  28 class DolphinController;
  29 class DolphinModel;
  30 class KUrl;
  31 class QAbstractProxyModel;
  32 class QTimeLine;
  33
  34 /**
  35  * @brief Represents the view, where each directory is show as separate column.
  36  *
  37  * @see DolphinIconsView
  38  * @see DolphinDetailsView
  39  */
  40 class DolphinColumnView : public QAbstractItemView
  41 {
  42     Q_OBJECT
  43
  44 public:
  45     explicit DolphinColumnView(QWidget* parent, DolphinController* controller);
  46     virtual ~DolphinColumnView();
  47
  48     virtual QModelIndex indexAt(const QPoint& point) const;
  49     virtual void scrollTo(const QModelIndex& index, ScrollHint hint = EnsureVisible);
  50     virtual QRect visualRect(const QModelIndex& index) const;
  51     virtual void setModel(QAbstractItemModel* model);
  52
  53     /**
  54      * Reloads the content of all columns. In opposite to non-hierarchical views
  55      * it is not enough to reload the KDirLister, instead this method must be explicitly
  56      * invoked.
  57      */
  58     void reload();
  59
  60 public slots:
  61     /**
  62      * Shows the column which represents the URL \a url. If the column
  63      * is already shown, it gets activated, otherwise it will be created.
  64      */
  65     void showColumn(const KUrl& url);
  66
  67 protected:
  68     virtual bool isIndexHidden(const QModelIndex& index) const;
  69     virtual QModelIndex moveCursor(CursorAction cursorAction, Qt::KeyboardModifiers modifiers);
  70     virtual void setSelection(const QRect& rect, QItemSelectionModel::SelectionFlags flags);
  71     virtual QRegion visualRegionForSelection(const QItemSelection& selection) const;
  72     virtual int horizontalOffset() const;
  73     virtual int verticalOffset() const;
  74
  75     virtual void mousePressEvent(QMouseEvent* event);
  76     virtual void resizeEvent(QResizeEvent* event);
  77
  78 private slots:
  79     void zoomIn();
  80     void zoomOut();
  81     void triggerItem(const QModelIndex& index);
  82
  83     /**
  84      * Moves the content of the columns view to represent
  85      * the scrollbar position \a x.
  86      */
  87     void moveContentHorizontally(int x);
  88
  89     /**
  90      * Updates the size of the decoration dependent on the
  91      * icon size of the ColumnModeSettings. The controller
  92      * will get informed about possible zoom in/zoom out
  93      * operations.
  94      */
  95     void updateDecorationSize();
  96
  97     /**
  98      * Expands the directory model the the currently active URL.
  99      * Used by DolphinColumnView::reload() after the directory
 100      * lister has been loaded.
 101      */
 102     void expandToActiveUrl();
 103
 104     /**
 105      * Triggers the reloading of columns after the model index
 106      * \a index has been expanded. Used by DolphinModel::expandToActiveUrl().
 107      */
 108     void triggerReloadColumns(const QModelIndex& index);
 109
 110     /**
 111      * Adjusts the root index of all columns to represent the reloaded
 112      * model. Used by DolphinModel::triggerReloadColumns().
 113      */
 114     void reloadColumns();
 115
 116 private:
 117     bool isZoomInPossible() const;
 118     bool isZoomOutPossible() const;
 119
 120     inline ColumnWidget* activeColumn() const;
 121
 122     /**
 123      * Deactivates the currently active column and activates
 124      * the new column indicated by \a index. m_index represents
 125      * the active column afterwards. Also the URL of the navigator
 126      * will be adjusted to reflect the column URL.
 127      */
 128     void setActiveColumnIndex(int index);
 129
 130     void layoutColumns();
 131     void updateScrollBar();
 132
 133     /**
 134      * Assures that the currently active column is fully visible
 135      * by adjusting the horizontal position of the content.
 136      */
 137     void assureVisibleActiveColumn();
 138
 139     /**
 140      * Request the activation for the column \a column. It is assured
 141      * that the columns gets fully visible by adjusting the horizontal
 142      * position of the content.
 143      */
 144     void requestActivation(ColumnWidget* column);
 145
 146     /**
 147      * Deletes all inactive child columns, that are a child of
 148      * the currently active column.
 149      */
 150     void deleteInactiveChildColumns();
 151
 152 private:
 153     DolphinController* m_controller;
 154     bool m_restoreActiveColumnFocus;
 155     int m_index;
 156     int m_contentX;
 157     QList<ColumnWidget*> m_columns;
 158     QTimeLine* m_animation;
 159
 160     DolphinModel* m_dolphinModel;
 161     QAbstractProxyModel* m_proxyModel;
 162
 163     friend class ColumnWidget;
 164 };
 165
 166 ColumnWidget* DolphinColumnView::activeColumn() const
 167 {
 168     return m_columns[m_index];
 169 }
 170
 171 #endif