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

[Robert Krahn]

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) {
		
		console.log('PersistedMorph.initialize');
		$super(new lively.scene.Rectangle(new Rectangle(100, 100, 200, 200)));
		
		this.setFill(Color.green);
		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');
		console.log('PersistedMorph.onMouseDown weight: ' + this.weight);
		this.weight = 100;
		
		return true;
	}
});


Robert


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.
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