It is to provide GUI extensibility such as extended forms - Here a rough
description :
Entity models :
public class EntityA {
private String foo;
//accessors
...
}
public class EntityB extends EntityA{
private String bla;
//accessors
...
}
ComponentA :
<t:form t:id="myForm">
foo : <input t:type="textfield" t:id="foo" t:value="myEntity.foo"
name="foo"/>
<t:extension-point id="formExtension"/>
//submit button...
...
</t:form>
public class ComponentA.java {
@Persist
private EntityA myEntity;
@OnEvent(EventConstants.PREPARE_FOR_RENDER)
public void init(){
myEntity = new EntityA();
}
@OnEvent(EventConstants.SUCCESS)
public Object success(){
//call manager to persist data
return List.class;
}
//myEntity accessors
...
}
ComponentB :
<t:extend xmlns:t="http://tapestry.apache.org/schema/tapestry_5_1_0.xsd";>
<t:replace id="formExtension">
bla : <input t:type="textfield" t:id="bla"
t:value="myEntity.bla"
name="bla" />
</t:replace>
</t:extend>
public class ComponentB extends ComponentA {
@Persist
@Property //works with tapestry 5.1, not with 5.2
private EntityB myEntity;
@OnEvent(EventConstants.PREPARE_FOR_RENDER)
public void init(){
myEntity = new EntityB();
//Use setter from the superclass
setEntity(myEntity);
}
// override onsuccess event
@OnEvent(EventConstants.SUCCESS)
public Object sucess(){
//call manager to store data
return List.class;
}
...
}
ComponentA is part of a component library that runs as a standalone app (i
mean it is not a simple base class).
Nourredine.
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