Question

Swing JCheckBox is based on MVC. Thus, I want that the check boxes in my GUI use a data model that my custom class provides.

That is:

checkBox1 is “bound” to a property isBackgroundShown
checkBox2 is “bound” to a property isResizingEnabled

The checkboxes should be based on property state, the property state should fire a checkbox refresh if changed.

Answer 1

actually, AbstractButtons don’t have a “real” model (which should be shareable across buttons) – the ButtonModel has per-instance view state (pressed, armed) mixed with more data-like state like selected. What’s worse, the selected property on the button only looks like a bound property (with setters and getters) but isn’t (never fires propertyChange).

Your options:

• implement a ButtonModel which fires a PropertyChange on change of selected and set it to the JCheckBox, then bind that new property of the model to your data property
• use an Action as intermediate and bind the its Action.SELECTED_KEY to your data model
• implement an Adapter on top of the ButtonModel which maps changeEvents to propertyChangeEvents if selected changed
• use a binding framework which does the one or other automatically (JGoodies Binding does the first, BeansBinding the last)