This is the development blog of the Spring Rich Client Project Team.

Monday, January 14, 2008

Integrating xswingx Prompt

In this tutorial you will learn how to create your own FormComponentInterceptor, by integrating xswingx. The xswingx project provides input prompts.

As our new interceptor will intercept text components, we can subclass the TextComponentInterceptor class, which defines a protected void processComponent(String propertyName, JTextComponent textComponent) method:

public class PromptTextFieldFormComponentInterceptor extends TextComponentInterceptor {

The following attributes are needed. The MessageSource to fetch the prompt text, the FormModel to scope our message key, and the prompt key to construct the message key:

    private MessageSource messageSource;
private FormModel formModel;
private String promptKey;

public PromptTextFieldFormComponentInterceptor(FormModel formModel, MessageSource messageSource,
String promptKey) {
this.formModel = formModel;
this.messageSource = messageSource;
this.promptKey = promptKey;

The processComponent method will use the MessageSource to find the prompt text (using the keys created by the getMessageKeys method), and will use the xswingx PromptSupport class to install the prompt on the JTextComponent:

    protected void processComponent(String propertyName, JTextComponent textComponent) {
String prompt = messageSource.getMessage(new DefaultMessageSourceResolvable(getMessageKeys(formModel,
propertyName), ""), Locale.getDefault());

if (StringUtils.hasText(prompt)) {
PromptSupport.setPrompt(prompt, textComponent);

And finally the getMessageKeys method, which will create an array of message keys used to load the message. Two keys will be created, formModelId.propertyName.promptKey and propertyName.promptKey:

    protected String[] getMessageKeys(FormModel formModel, String propertyName) {
return new String[] { formModel.getId() + "." + propertyName + "." + promptKey,
propertyName + "." + promptKey };

Now define the interceptor in the formComponentInterceptorFactory bean in your application context:

 <bean class="org.springframework.richclient.form.PromptTextFieldFormComponentInterceptorFactory"/>

And add some messages to

firstName.prompt=<Enter the first name>
lastName.prompt=<Enter the last name>

This is the result:


Lieven Doclo said...

The bean definition won't work, since there is no default constructor. Trying to load the bean, results in a NoSuchMethodException for the empty constructor.

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