How to show information of each task in Gantt chart

Question

i am using Jfreechart to write a projet of analysing log file, i have a problem of overvide generateToolTip ,what i want to do is when the user move his mouse to a point of

Answer 1

This is a code I've written to extract the description of sub task as the tool tip. It provides each sub-task displaying different tooltip information.

It could not be the best coding sample but it works. You may modify accordingly and use it.

class MyCategoryToolTipGenerator implements CategoryToolTipGenerator
{
    HashMap> subTaskMap;

    public MyCategoryToolTipGenerator()
    {
        subTaskMap = new HashMap>();
    }

    @Override
    public String generateToolTip(CategoryDataset categoryDataset, int row, int col )
    {

        TaskSeriesCollection taskSeriesCollection = (TaskSeriesCollection) categoryDataset;

        if ( row >= taskSeriesCollection.getRowCount() )
        {
            return "";
        }
        TaskSeries taskSeries = taskSeriesCollection.getSeries( row );


        if ( col >= taskSeries.getItemCount() )
        {
            return "";
        }
        Task task = taskSeries.get( col );

        //Sub Task tooltip handling//
        if( task.getSubtaskCount() > 0 )
        {
            //Task Key for main task
            String taskKey = "r=" + row + "c=" + col;

            //System.out.println( "Sub Task Count = " + task.getSubtaskCount() + " r=" + row + " c=" + col  );
            List subTaskList = null;
            if( subTaskMap.containsKey( taskKey ) )
            {
                //If already added, pick the list of available sub tasks
                subTaskList = subTaskMap.get( taskKey );
            }
            else
            {
                //If not found, add all sub tasks to map
                int subTaskCount = task.getSubtaskCount();
                subTaskList = new ArrayList( subTaskCount );
                for( int i = 0; i < subTaskCount; i++ )
                {
                    //System.out.println("Adding sub task " + task.getSubtask( i ).getDescription());
                    subTaskList.add( task.getSubtask( i ) );
                }
                subTaskMap.put( taskKey, subTaskList );
            }

            if( subTaskList != null && subTaskList.size() > 0 )
            {
                //Take the top most sub task and remove it from list
                Task subTask = subTaskList.remove( 0 );
                //System.out.println("Remove sub task " + subTask.getDescription());

                //If no other sub tasks available remove key from list
                if( subTaskList.size() <= 0 )
                {
                    //System.out.println("Remove Key " + taskKey);
                    subTaskMap.remove( taskKey );
                }

                //Return the top most subtask description
                return subTask.getDescription();
            }
        }

        return task.getDescription();
    }
}