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
@@ -1,225 +1,231 @@
 /*
                              This file is part of the Opie Project
 
               =.             (C) 2003 Michael 'Mickey' Lauer <mickey@tm.informatik.uni-frankfurt.de>
             .=l.
            .>+-=
  _;:,     .>    :=|.         This program is free software; you can
 .> <`_,   >  .   <=          redistribute it and/or  modify it under
 :`=1 )Y*s>-.--   :           the terms of the GNU Library General Public
 .="- .-=="i,     .._         License as published by the Free Software
  - .   .-<_>     .<>         Foundation; either version 2 of the License,
      ._= =}       :          or (at your option) any later version.
     .%`+i>       _;_.
     .i_,=:_.      -<s.       This program is distributed in the hope that
      +  .  -:.       =       it will be useful,  but WITHOUT ANY WARRANTY;
     : ..    .:,     . . .    without even the implied warranty of
     =_        +     =;=|`    MERCHANTABILITY or FITNESS FOR A
   _.=:.       :    :=>`:     PARTICULAR PURPOSE. See the GNU
 ..}^=.=       =       ;      Library General Public License for more
 ++=   -.     .`     .:       details.
  :     =  ...= . :.=-
  -.   .:....=;==+<;          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 )
 {
     int result = QListView::addColumn( iconset, label, width );
     #if QT_VERSION > 290
     if (m_fullWidth) {
         header()->setStretchEnabled( false, columns()-2 );
         header()->setStretchEnabled( true, columns()-1 );
     }
     #endif
     return result;
 }
 
 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();
     }
 
     qDebug( "OListview stored." );
 }
 
 void OListView::serializeFrom( QDataStream& s )
 {
     #warning Caution... the binary format is still under construction...
     qDebug( "loading OListView..." );
 
     int cols;
     s >> cols;
     qDebug( "read number of columns = %d", cols );
 
     while ( columns() < cols ) addColumn( QString::null );
 
     for ( int i = 0; i < cols; ++i )
     {
         QString coltext;
         s >> coltext;
         qDebug( "read text '%s' for column %d", (const char*) coltext, i );
         setColumnText( i, coltext );
     }
 
     int items;
     s >> items;
     qDebug( "read number of items = %d", items );
 
     for ( int i = 0; i < items; ++i )
     {
         OListViewItem* item = childFactory();
         s >> *item;
     }
 
     qDebug( "OListView loaded." );
 
 }
 
 QDataStream& operator<<( QDataStream& s, const OListView& lv )
 {
     lv.serializeTo( s );
 }
 
 QDataStream& operator>>( QDataStream& s, OListView& lv )
 {
     lv.serializeFrom( s );
 }
 #endif // QT_NO_DATASTREAM
 
 /*======================================================================================
  * OListViewItem
  *======================================================================================*/
 
 OListViewItem::OListViewItem(QListView *parent)
   : QListViewItem(parent)
 {
     init();
 }
 
 
 OListViewItem::OListViewItem(QListViewItem *parent)
   : QListViewItem(parent)
 {
     init();
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
@@ -29,290 +29,301 @@
 */
 
 #ifndef OLISTVIEW_H
 #define OLISTVIEW_H
 
 #include <qcolor.h>
 #include <qlistview.h>
 #include <qpen.h>
 #include <qdatastream.h>
 #include <qstringlist.h>
 
 class OListViewItem;
 
 
 /*======================================================================================
  * OListView
  *======================================================================================*/
 
 /**
  * @brief A list/tree widget.
  *
  * A @ref QListView variant featuring visual and functional enhancements
  * like an alternate background for odd rows, an autostretch mode
  * for the width of the widget ( >= Qt 3 only ) and persistence capabilities.
  *
  * @author Michael 'Mickey' Lauer <mickey@tm.informatik.uni-frankfurt.de>
  */
 class OListView: public QListView
 {
   public:
    /**
     * Constructor.
     *
     * The parameters @a parent and @a name are handled by
     * @ref QListView, as usual.
     */
     OListView( QWidget* parent = 0, const char* name = 0 );
    /**
     * Destructor.
     */
     virtual ~OListView();
    /**
     * Let the last column fit exactly all the available width.
     */
     void setFullWidth( bool fullWidth );
    /**
     * Returns whether the last column is set to fit the available width.
     */
     bool fullWidth() const;
    /**
     * Reimplemented for full width support
     */
     virtual int addColumn( const QString& label, int width = -1 );
    /**
     * Reimplemented for full width support
     */
     virtual int addColumn( const QIconSet& iconset, const QString& label, int width = -1 );
    /**
     * Reimplemented for full width support
     */
     virtual void removeColumn(int index);
    /**
     * Set the alternate background background @a color.
     * Set to an invalid color to disable alternate colors.
     * 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 );
     OListViewItem( QListViewItem * parent, QListViewItem * after );
 
     OListViewItem( QListView * parent,
         QString,     QString = QString::null,
         QString = QString::null, QString = QString::null,
         QString = QString::null, QString = QString::null,
         QString = QString::null, QString = QString::null );
 
     OListViewItem( QListViewItem * parent,
         QString,     QString = QString::null,
         QString = QString::null, QString = QString::null,
         QString = QString::null, QString = QString::null,
         QString = QString::null, QString = QString::null );
 
     OListViewItem( QListView * parent, QListViewItem * after,
         QString,     QString = QString::null,
         QString = QString::null, QString = QString::null,
         QString = QString::null, QString = QString::null,
         QString = QString::null, QString = QString::null );
 
     OListViewItem( QListViewItem * parent, QListViewItem * after,
         QString,     QString = QString::null,
         QString = QString::null, QString = QString::null,
         QString = QString::null, QString = QString::null,
         QString = QString::null, QString = QString::null );
     /**
      * Destructor.
      */
     virtual ~OListViewItem();
     /**
      * @returns the background color of the list item.
      */
     const QColor& backgroundColor();
     /**
      * @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>
  */
 class ONamedListView: public OListView
 {
   public:
     /**
      * Constructor.
      *
      * The parameters @a parent and @a name are handled by
      * @ref OListView, as usual.
      */
     ONamedListView( QWidget* parent = 0, const char* name = 0 );
     /**
      * Destructor.
      */
     virtual ~ONamedListView();
     /**
      * Add a number of @a columns to the listview.
      */
     virtual void addColumns( const QStringList& columns );
     /**
      * @returns the column index matching to @a text or -1 if not found.
      */
     virtual int findColumn( const QString& text ) const;
     /**
      * @returns the first item which has a @a text in column @a column.
      * Set @a recurse to indicate how much subchild levels to search, e.g.<ul>
      * <li>set it to 0 to search only among direct childs,
      * <li>set it to 1 to search direct childs and all 1st order subchilds
      * <li>set it to -1 for maximum recursion.
      * </ul>
      * @sa ONamedListViewItem::find()
      */
     virtual ONamedListViewItem* find( ONamedListViewItem* start, int column, const QString& text, int recurse = -1 ) const;
     virtual ONamedListViewItem* find( int column, const QString& text, int recurse = -1 ) const;
 
     virtual ONamedListViewItem* find( ONamedListViewItem* start, const QString& column, const QString& text, int recurse = -1 ) const;
     virtual ONamedListViewItem* find( const QString& column, const QString& text, int recurse = -1 ) const;
 };
 
 /*======================================================================================
  * ONamedListViewItem
  *======================================================================================*/
 
 /**
  * @brief An OListView variant with named columns.
  *
  * This class provides a higher-level interface to an OListViewItem.
  *
  * @author Michael 'Mickey' Lauer <mickey@tm.informatik.uni-frankfurt.de>
  */
 class ONamedListViewItem: public OListViewItem
 {
   public:
     /**
      * Constructor. Accepts the same parameters as a @ref OListViewItem,
      * plus a @ref QStringList which holds an arbitrary number of @a texts.
      */
     ONamedListViewItem( QListView* parent, const QStringList& texts );
     ONamedListViewItem( QListViewItem* parent, const QStringList& texts );
     ONamedListViewItem( QListView* parent, QListViewItem* after, const QStringList& texts );
     ONamedListViewItem( QListViewItem* parent, QListViewItem* after, const QStringList& texts );
     /**
      * Destructor.
      */
     virtual ~ONamedListViewItem();