Re: Color for disabled controls

Jim C. wrote:
> OK, so there is this bug in Sun's JTable.
> Calling JTable.setEnabled(false) doesn't also cause the table header's
> appearance to changed. It functions properly but there is no visible
> change in the header.
> 
> Question:
> 
> What are some good ways to change appearance based on enabled/disabled
> state?  I.E. how should the foreground/background colors change?  I
> would think that they should have White added to them if they are disabled.

Today, I have an answer for this.  Observe this clip which I found at
http://www.chka.de/swing/table/faq.html :


> Why doesn't the JTable appear "greyed-out" when it is set to disabled?
> 
> The default renderers don't react to the JTable's enabled state. Since the renderers don't react to user input anyway, it is only a matter of apperarance. It is not possible to adjust the default renderers (those for Numbers, Booleans, Date, the header renderer) in any way. Custom renderers should always adjust the renderer components like this:
> 
> class FixedTableCellRenderer
>     extends DefaultTableCellRenderer
> {
>     public Component getTableCellRendererComponent
>         (JTable table, Object value, boolean selected, boolean focused, int row, int column)
>     {
>         setEnabled(table == null || table.isEnabled());
> 
>         super.getTableCellRendererComponent(table, value, selected, focused, row, column);
> 
>         return this;
>     }
> }


Since we were using the TableSorter example provided by Sun for tables
that can sort themselves by columns, all that was required was the
addition of a single line from the above:

setEnabled(table == null || table.isEnabled());

This was added to our implementation of getTableCellRendererComponent
and viola! Now the table header looks disabled when it has been.  :-)

Jim.


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