@AfterCompose
Syntax
@AfterCompose
@AfterCompose(superclass=true)
Description
Target: method, class (since 6.0.2)
Purpose: Marker annotation to identify a life-cycle method which will be called while BindComposer's doAfterCompose .
Binder calls the method with this annotation when initializing a ViewModel. Only one or none AfterCompose method is allowed in a ViewModel class. If you set annotation element superclass to true, the ViewModel's parent class's ini method will be invoked first then child's, and this logic repeat on super class. If a class has no method with @AfterCompose, no method will be called (including the super class's)[1].
For example, in class hierarchy A(has AfterCompose) <- B(has AfterCompose) <- C(no AfterCompose) <- D (has AfterCompose, superclass true). D is the last child class.
- When binder initializes D as a view model, it will call D's AfterCompose method.
- When binder initializes C, no method will be called.
- When binder initializes B , it will call As' then B's.
- When binder initializes A, it will call A's.
We also can use parameter related annotation on AfterCompose method's parameters, please refer to subsections of ZK Developer's Reference/MVVM/Syntax/ViewModel/Parameters.
- ↑ If you override parent class's AfterCompose method e.g. Parent.m1() <- Child.m1(). Because of Java's limitation, binder still call Child.m1(), and Child.m1() will be called twice. To avoid this, you should set superclass to false of Child.m1() and call super.m1() inside it.
Example
public class FooViewModel{
@AfterCompose
public void doFoo(){
//do while AfterCompose
}
}
public class BarViewModel extends FooViewModel{
@AfterCompose(superclass=true)
public void afterComposeBar(){
//AfterCompose method of super class FooViewModel will be called first.
}
}
//since 6.0.2
@AfterCompose(superclass=true)
public class ChildViewModel extends BarViewModel{
}
Version History
| Version | Date | Content |
|---|---|---|
| 6.0.2 | February 2012 | The MVVM was introduced. |