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Re: JList items

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  To: comp.lang.java.gui
Awesome, I'll give that a try.  Thanks

Michael Rauscher wrote:
> Ooder schrieb:
> > Hi,
> >
> > I have a JList that contains a list of steps to do something.  When the
> > user completes a step they then select the next step, and the previous
> > step is considered complete.  Is there a way to format an individual
> > JList item, so I could visually display that a step is done (italic
> > text, unenabled, gray background, etc)?  Do I have to create a custom
> > ListCellRenderer?  If so, how, since I need to be able to customize
> > individual items in the list?
>
> One possibility would be to not use JList but JTable having two columns
> for both, the step and the status of the task.
>
> If you want to use JList, then you would have to use a custom cell
> renderer. The "how to" is something that you must decide on your own. In
> general, a cell renderer performs only the... rendering :) Therefore the
> status of a task is not stored by the renderer but is represented by the
> value it should render.
>
> Depending on what you currently have you'll need a class that represents
> a task and the task's status:
>
> class TaskEntry {
>      private String title;
>      private boolean done;
>
>      ...
> }
>
> The ListModel returns objects of type TaskEntry. The cell renderer
> handles them, e. g.
>
> class TaskEntryRenderer extends DefaultListCellRenderer {
>      private Color OUTSTANDING = Color.BLACK;
>      private Color DONE = Color.GREEN;
>
>      public Component getListCellRendererComponent( JList list,
>              Object value, int index, boolean sel, boolean focus ) {
>          TaskEntry entry = (TaskEntry)value;
>          Component c = super.getListCellRendererComponent( list,
>                  entry.getTitle(), index, sel, focus );
>          c.setColor( entry.isDone() ? DONE : OUTSTANDING );
>          return c;
>      }
> }
> 
> Bye
> Michael

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JList items "Ooder" <ooder@THRWHITE.remove-dii-this> - 2011-04-27 15:29 +0000
  Re: JList items "Michael Rauscher" <michael.rauscher@THRWHITE.remove-dii-this> - 2011-04-27 15:29 +0000
    Re: JList items "Ooder" <ooder@THRWHITE.remove-dii-this> - 2011-04-27 15:29 +0000

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