Re: jcombobox custom renderer

From:
Albert <albert@voila.fr>
Newsgroups:
comp.lang.java.programmer
Date:
Thu, 26 Mar 2009 08:16:41 +0100
Message-ID:
<49cb2b2f$0$17760$ba4acef3@news.orange.fr>
Mark a ?crit :

I want to display some business objects (Sections in this case) in a
jcombobox rather than strings and I've been able to get the drop down
list to successfully display the necessary text like so:

sectionComboBox.setRenderer(new DefaultListCellRenderer() {
    public Component getListCellRendererComponent(JList list, Object value,
        int index, boolean isSelected, boolean cellHasFocus) {
        super.getListCellRendererComponent(list, value, index,
isSelected,
                                                              
cellHasFocus);

        if (value instanceof Section) {
            Section s = (Section)value;
            setText(s.getDescription());
        }

        return this;
    }
});

but the text in the *editor* is displayed as
com.mms.sourceit.server.Section[id=1] (the value of Section.toString())
rather than Section.getDescription().

Does anyone know what I need to do to get the jcombobox editor to
display the Section's description?


My guess is that the editor part of the jcombobox is a jtextfield, so
you don't have access to a Section in the renderer. You should detect
the case of editor with index == -1, and then get the selectedItem from
the combobox to get the section.

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