@DependsOn
Syntax
@DependsOn
Description
Target: getter method
Purpose: To notify change upon property's dependency.
It has the same function as @NotifyChange
but with an inverse meaning. It is 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);
}
}