[General] Storing Values when a Morph is Persisted, How To

Robert Krahn robert.krahn at student.hpi.uni-potsdam.de
Wed Mar 4 08:46:50 CET 2009

Hi Phil,

the getTrait and setTrait methods are used by shapes, not morphs. All  
instance variables of morphs are persistent a priori. I modified your  
test code a bit:

Morph.subclass("MyPersistedMorph", {
	handlesMouseDown : Functions.True,
	initialize : function($super) {
		$super(new lively.scene.Rectangle(new Rectangle(100, 100, 200, 200)));
		console.log('PersistedMorph.initialize weight: ' + this.weight); //  
will always be undefined because
									// initialize isn't called for deserialization
	onDeserialize: function() {
		console.log('PersistedMorph.onDeserialize weight: ' +  
this.weight); // This works
	onMouseDown : function($super, event) {
		console.log('PersistedMorph.onMouseDown weight: ' + this.weight);
		this.weight = 100;
		return true;


On Mar 3, 2009, at 11:18 PM, Philip Weaver wrote:

> I struggled with a very simple yet important subject and I just want  
> to post a possible solution here. I wanted to persist some simple  
> values when one of my morph instances was persisted. I am not using  
> the Widgets class at this time. My goal is persist some layout  
> constraints on a morph.
> The Morph class does extend from lively.data.Wrapper.  
> lively.data.Wrapper provides methods for setTrait and getTrait which  
> do store and restore automatically when a Morph is serialized and  
> deserialized.
> Another approach may be to use models. Because I'm not really yet  
> using the Widgets class I don't really have models working yet.  
> There appears to be no documentation yet for using models except for  
> Examples.js.
> _______________________________________________
> General mailing list
> General at livelykernel.sunlabs.com
> http://livelykernel.sunlabs.com/mailman/listinfo/general

-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://livelykernel.sunlabs.com/pipermail/general/attachments/20090303/07c53389/attachment.html 

More information about the lively-kernel mailing list