Can Designer use custom widgets?
Yes., with a few restrictions. For Swing, any public JComponent subclass that has a public, zero-argument constructor can be used (as required by the Java Bean spec). Custom properties are derived through reflection by looking for getter/setter pairs of known types. If a matching JavaBean class is defined and available, it will be used for any custom properties. Custom JPanel subclasses will show their subcomponents when placed in Designer. For SWT, any public Control subclass that has a public, two-argument constructor can be used (as is standard for all base SWT widgets). Custom properties are derived through reflection by looking for getter/setter pairs of known types. SWT does not yet define any kind of JavaBean interface, so no further customization is available. Custom Composite subclasses will show their subcomponents when placed in Designer. For GWT, any public Widget subclass that has a public, zero-argument constructor can be used (as is standard for all base GWT widgets). Cu
