ZK Developer's Reference/MVVM/Syntax/ViewModel/@DependsOn

This article is out of date, please refer to zk-mvvm-book/8.0/syntax/viewmodel/dependson for more up to date information.

Syntax

@DependsOn

Description

Target: getter method

Purpose: To notify change upon property's dependency.

It has the same function as @NotifyChange but inverse meaning. It's used to notify binder that getter method's target property is changed because one or more properties it depends on are changed. It can eliminate distributed @NotifyChange annotations in a ViewModel when a calculated property depends on multiple properties.

Example

public class FullnameViewModel{
	private String firstname;
	private String lastname;
	public String getFirstname() {
		return firstname;
	}
	public void setFirstname(String firstname) {
		this.firstname = firstname;
	}

	public String getLastname() {
		return lastname;
	}
	public void setLastname(String lastname) {
		this.lastname = lastname;
	}
	
	@DependsOn({"firstname", "lastname"})
	public String getFullname() {
		return (firstname == null ? "" : firstname)	+ " "
				+ (lastname == null ? "" : lastname);
	}
}

Version History

Version	Date	Content
6.0.0	February 2012	The MVVM was introduced.