support OListViewItem specific overload of expand to give those the chance

to compute stuff "just in time" - this is also known as lazy computation
patch by tille

2 files changed, 17 insertions, 0 deletions

diff --git a/libopie2/opieui/olistview.cpp b/libopie2/opieui/olistview.cpp
index 8f290d3..ec503dd 100644
--- a/libopie2/opieui/olistview.cpp
+++ b/libopie2/opieui/olistview.cpp
@@ -22,64 +22,65 @@
  -.   .:....=;==+<;          You should have received a copy of the GNU
   -_. . .   )=.  =           Library General Public License along with
     --        :-=`           this library; see the file COPYING.LIB.
                              If not, write to the Free Software Foundation,
                              Inc., 59 Temple Place - Suite 330,
                              Boston, MA 02111-1307, USA.
 
 */
 
 /* QT */
 
 #include <qcolor.h>
 #include <qheader.h>
 #include <qpainter.h>
 #include <qpixmap.h>
 
 /* OPIE */
 
 #include <opie2/olistview.h>
 
 /*======================================================================================
  * OListView
  *======================================================================================*/
 
 OListView::OListView( QWidget *parent, const char *name )
           :QListView( parent, name )
 {
     //FIXME: get from global settings and calculate ==> see oglobalsettings.*
 
     m_alternateBackground = QColor( 238, 246, 255 );
     m_columnSeparator = QPen( QColor( 150, 160, 170 ), 0, DotLine );
     m_fullWidth = true;
+    connect( this, SIGNAL(expanded(QListViewItem*)), SLOT(expand(QListViewItem*)));
 }
 
 OListView::~OListView()
 {
 }
 
 void OListView::setFullWidth( bool fullWidth )
 {
     m_fullWidth = m_fullWidth;
     #if QT_VERSION > 290
     header()->setStretchEnabled( fullWidth, columns()-1 );
     #endif
 }
 
 bool OListView::fullWidth() const
 {
     return m_fullWidth;
 }
 
 int OListView::addColumn( const QString& label, int width )
 {
     int result = QListView::addColumn( label, width );
     #if QT_VERSION > 290
     if (m_fullWidth) {
         header()->setStretchEnabled( false, columns()-2 );
         header()->setStretchEnabled( true, columns()-1  );
     }
     #endif
     return result;
 }
 
 int OListView::addColumn( const QIconSet& iconset, const QString& label, int width )
@@ -98,64 +99,69 @@ void OListView::removeColumn( int index )
 {
     QListView::removeColumn(index);
     #if QT_VERSION > 290
     if ( m_fullWidth && index == columns() )
     {
         header()->setStretchEnabled( true, columns()-1 );
     }
     #endif
 }
 
 const QColor& OListView::alternateBackground() const
 {
     return m_alternateBackground;
 }
 
 void OListView::setAlternateBackground( const QColor &c )
 {
     m_alternateBackground = c;
     repaint();
 }
 
 const QPen& OListView::columnSeparator() const
 {
     return m_columnSeparator;
 }
 
 void OListView::setColumnSeparator( const QPen& p )
 {
     m_columnSeparator = p;
     repaint();
 }
 
+void OListView::expand(QListViewItem *item)
+{
+         ((OListViewItem*)item)->expand();
+}
+
 OListViewItem* OListView::childFactory()
 {
     return new OListViewItem( this );
 }
 
 #ifndef QT_NO_DATASTREAM
 void OListView::serializeTo( QDataStream& s ) const
 {
     #warning Caution... the binary format is still under construction...
     qDebug( "storing OListView..." );
 
     // store number of columns and the labels
     s << columns();
     for ( int i = 0; i < columns(); ++i )
         s << columnText( i );
 
     // calculate the number of top-level items to serialize
     int items = 0;
     QListViewItem* item = firstChild();
     while ( item )
     {
         item = item->nextSibling();
         items++;
     }
 
     // store number of items and the items itself
     s << items;
     item = firstChild();
     for ( int i = 0; i < items; ++i )
     {
         s << *static_cast<OListViewItem*>( item );
         item = item->nextSibling();
diff --git a/libopie2/opieui/olistview.h b/libopie2/opieui/olistview.h
index 109e309..a00b43a 100644
--- a/libopie2/opieui/olistview.h
+++ b/libopie2/opieui/olistview.h
@@ -93,64 +93,70 @@ class OListView: public QListView
     * This only has an effect if the items are OListViewItems
     */
     void setAlternateBackground( const QColor& color );
    /**
     * Sets the column separator @a pen.
     */
     void setColumnSeparator( const QPen& pen );
 
    /**
     * @returns the alternate background color
     */
     const QColor& alternateBackground() const;
    /**
     * @return the column separator pen
     */
     const QPen& columnSeparator() const;
    /**
     * Create a list view item as child of this object
     * @returns the new object
     */
     virtual OListViewItem* childFactory();
 #ifndef QT_NO_DATASTREAM
    /**
     * Serialize this object to @ref QDataStream @a stream
     */
     virtual void serializeTo( QDataStream& stream ) const;
    /**
     * Serialize this object from a @ref QDataStream @a stream
     */
     virtual void serializeFrom( QDataStream& s );
 #endif
 
+protected slots:
+    /** 
+     * expand the current OListViewItem
+     */
+    void expand(QListViewItem*);    
+
   private:
     QColor m_alternateBackground;
     bool m_fullWidth;
     QPen m_columnSeparator;
 };
 
 #ifndef QT_NO_DATASTREAM
 /**
   * @relates OListView
   * Writes @a listview to the @a stream and returns a reference to the stream.
   */
 QDataStream& operator<<( QDataStream& stream, const OListView& listview );
 /**
   * @relates OListView
   * Reads @a listview from the @a stream and returns a reference to the stream.
   */
 QDataStream& operator>>( QDataStream& stream, OListView& listview );
 #endif // QT_NO_DATASTREAM
 
 /*======================================================================================
  * OListViewItem
  *======================================================================================*/
 
 class OListViewItem: public QListViewItem
 {
   public:
     /**
      * Constructors.
      */
     OListViewItem( QListView * parent );
     OListViewItem( QListViewItem * parent );
     OListViewItem( QListView * parent, QListViewItem * after );
@@ -191,64 +197,69 @@ class OListViewItem: public QListViewItem
      * @returns true, if the item is at an odd position and
      * thus have to be painted with the alternate background color.
      */
     bool isAlternate();
     /**
      * @note: Reimplemented for internal purposes - the API is not affected
      *
      */
     void paintCell( QPainter *p, const QColorGroup &cg, int column, int width, int alignment );
     /**
      * Perform object initialization.
      */
     void init();
    /**
     * create a list view item as child of this object
     * @returns the new object
     */
     virtual OListViewItem* childFactory();
     #ifndef QT_NO_DATASTREAM
    /**
     * serialize this object to or from a @ref QDataStream
     * @param s the stream used to serialize this object.
     */
     virtual void serializeTo( QDataStream& s ) const;
 
    /**
     * serialize this object to or from a @ref QDataStream
     * @param s the stream used to serialize this object.
     */
     virtual void serializeFrom( QDataStream& s );
     #endif
 
+    /**
+     * expand the the item
+     */
+    virtual void expand(){};
+
   private:
     bool m_known;
     bool m_odd;
 };
 
 #ifndef QT_NO_DATASTREAM
 /**
   * @relates QListViewItem
   * Writes listview @a item and all subitems recursively to @a stream
   * and returns a reference to the stream.
   */
 QDataStream& operator<<( QDataStream& stream, const OListViewItem& item );
 /**
   * @relates QListViewItem
   * Reads listview @a item from @a stream and returns a reference to the stream.
   */
 QDataStream& operator>>( QDataStream& stream, OListViewItem& item );
 #endif // QT_NO_DATASTREAM
 
 /*======================================================================================
  * ONamedListView
  *======================================================================================*/
 
 class ONamedListViewItem;
 
 /**
  * @brief An OListView variant with named columns.
  *
  * This class provides a higher-level interface to an OListView.
  *
  * @author Michael 'Mickey' Lauer <mickey@tm.informatik.uni-frankfurt.de>
  */