[Dynapi-Dev] An easy way to Subclass/Overwrite functions

[Raymond I. <xw...@ya...>]

Hi,


I've been thinking about creating an easier way to
subclass/overwrite methods:

DynObject.prototype.subclass = function(n,fn){
	if(!this._sbCls) this._sbCls=1;
	var om = '_sbMethod'+(this._sbCls++); // old method

eval('fn='+(fn+'').replace(/\~subclass\(/g,'this.'+om+'('));
	this[om]=this[n];
	this[n]=fn;
};

Usage:


MyWidget.prototype.subclass('setSize',function(w,h){
	~subclass(w,h); // call old setSize method;
	// some code here
});

The above would subclass setSize() with the new
function. The ~subclass() function will allow you to
call the old/orginal setSize() function

It's similar to:

MyWidget.prototype._oldSetSize =
DynLayer.prototype.setSize;
MyWidget.prototype.setSize =
function('setSize',function(w,h){
	this.oldSetSize(w,h); // call old setSize method;
	// some code here
});


Is the term "subclass" correct or should we term it as
"overwrite"?

Any comments? 

--
Raymond Irving

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