Label Functions - set_label, table_labeler

Cogent Tools Demo and Tutorials: Version 4.0
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# 7.6. Label Functions - `set_label`, `table_labeler`

These are convenience functions that facilitate creating labels. The first is called by the `toggle_sym` function to change the label on the Auto mode button. The second simplifies putting a label into a table.

       /*--------------------------------------------------------------------
        * Function:    set_label
        * Returns:     t or nil
        * Description: Sets the label of a button according to
        *              the value of a database point.
        *------------------------------------------------------------------*/
       function set_label(button, sym, onvalue, offvalue)
       {
         if (eval(sym) != 0)
           button.label = onvalue;
         else
           button.label = offvalue;
       }

       /*--------------------------------------------------------------------
        * Function:    table_labeler
        * Returns:     t or nil
        * Description: Creates a label and puts it into a table.
        *------------------------------------------------------------------*/
       function table_labeler(table, txt, left, right, top, bottom)
       {
         local label;

         label = new(GtkLabel);
         label.set_text(txt);
         table.attach_defaults(label, left, right, top, bottom);
       }

| The `set_justify` method on the `GtkLabel` apparently has no effect, at least not in this context. As a work-around, we justify our labels by adding space as necessary in the text string that is passed as the `txt` parameter.

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