QTable selections in Qt3.3

[Rayven]

I am subclassing QTable in order to have refined control over the column sorting and the selection of the rows. I am using Qt 3.3 for company reasons and do not have control over switching to Qt 4. I have created a pseudo "Variant Table Model" class that stores whether the row is selected or hidden. The TableModel class is sorted whenever a column header is clicked and the table is cleared and repopulated in the new sorted. If the selection is changed by highlighting a row, the table is cleared and redrawn with the new selection, keeping the old rows selected.

connect( this, SIGNAL( clicked( int, int, int, const QPoint& ) ), this, SLOT( changeSelection( int, int, int, const QPoint& ) ) );
 
 
void Table::changeSelection( int row, int col, int button, const QPoint &mousePos )
{
   if( button == Qt::LeftButton )
   {
      bool selected;
 
      // Check if the current row is supposed to be selected
      if( mpTableData->isEventSelected( row ) ) 
      {
         selected = false;
      }
      else
      {
         selected = true;
      }
 
      int selectedValue = mpTableData->getEventData( row );
 
      // Loop through all the data elements checking if there are duplicates event data
      for( int event = 0; event < mpTableData->getTotalNumEvents( ); event++ )
      {
          if( selectedValue == mpTableData->getEventData( row ) )
          {
             // If the events match, select/deselect both events   
             mpTableData->selectEvent( event, select ); // Sets the flag in the Data Model
          }
      }
      updateSelections( );
   }
}
 
void Table::updateSelections( )
{
   blockSignals( );
 
   clearSelection( );
 
   for( int event = 0; event < mpTableData->getTotalNumEvents( ); event++ )
   {
      if( !mpTableData->isEventHidden( event )
         if( mpTableData->isEventSelected( event ) )
            addSelection( QTableSelection( row, 0, row, numCols( ) - 1 ) );
 
      row = row + 1;
   }
 
   blockSignals( false );
}

connect( this, SIGNAL( clicked( int, int, int, const QPoint& ) ), this, SLOT( changeSelection( int, int, int, const QPoint& ) ) );


void Table::changeSelection( int row, int col, int button, const QPoint &mousePos )
{
   if( button == Qt::LeftButton )
   {
      bool selected;

      // Check if the current row is supposed to be selected
      if( mpTableData->isEventSelected( row ) ) 
      {
         selected = false;
      }
      else
      {
         selected = true;
      }
  
      int selectedValue = mpTableData->getEventData( row );

      // Loop through all the data elements checking if there are duplicates event data
      for( int event = 0; event < mpTableData->getTotalNumEvents( ); event++ )
      {
          if( selectedValue == mpTableData->getEventData( row ) )
          {
             // If the events match, select/deselect both events   
             mpTableData->selectEvent( event, select ); // Sets the flag in the Data Model
          }
      }
      updateSelections( );
   }
}

void Table::updateSelections( )
{
   blockSignals( );

   clearSelection( );
      
   for( int event = 0; event < mpTableData->getTotalNumEvents( ); event++ )
   {
      if( !mpTableData->isEventHidden( event )
         if( mpTableData->isEventSelected( event ) )
            addSelection( QTableSelection( row, 0, row, numCols( ) - 1 ) );

      row = row + 1;
   }

   blockSignals( false );
}

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Printing the Model values, produces the correct selected rows at least through the model, but when the code goes through the addSelection( ) the rows are not selected correctly. For example: select row 1 on the table, the model selects event 1 correctly and the table highlights row one. Next select row 4 on the table, the model selects event 4 (in addition to event 1) but the table will only hightlight row 4 not row 1. Next select row 2, events 2, 4, and 1 are selected in the model, but the actual table will only highlight rows 1 and 2 and not 4. The addSelection is called for rows 1, 2 and 4 but only 1 and 2 will actually be highlighted. The rows that are highlighted varies from run to run, the model contents are always correct, but the highlighted rows on the QTable are not. I am at a loss as to why this is happening, but I am hoping that someone here may have a great idea!!

Thanks in advance.

[Rayven]

After much hair pulling, with the help of ToddAtWSU we were able to figure out a solution: we had to capture the mouse press and release events and perform the selections during the events using contentsMouseDoubleClickEvent(). What threw me was since I am used to Qt4, this was a different event handler than I am used to.