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Made instanceof reflection work for class hierarchies. r=elemoine,pvalsecc (closes #1802)

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git-svn-id: http://svn.openlayers.org/trunk/openlayers@8445 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf
This commit is contained in:
ahocevar
2008-12-05 11:31:29 +00:00
parent 59bf4105bd
commit 68c2cbcebd
2 changed files with 30 additions and 1 deletions
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16
lib/OpenLayers/BaseTypes/Class.js
View File

@@ -17,6 +17,8 @@
* To create a new OpenLayers-style class with multiple inheritance, use the
* following syntax:
* > var MyClass = OpenLayers.Class(Class1, Class2, prototype);
* Note that instanceof reflection will only reveil Class1 as superclass.
* Class2 ff are mixins.
*
*/
OpenLayers.Class = function() {
@@ -33,9 +35,21 @@ OpenLayers.Class = function() {
}
};
var extended = {};
var parent;
var parent, initialize;
for(var i=0, len=arguments.length; i<len; ++i) {
if(typeof arguments[i] == "function") {
// make the class passed as the first argument the superclass
if(i == 0 && len > 1) {
// replace the initialize method with an empty function,
// because we do not want to create a real instance here
initialize = arguments[i].prototype.initialize;
arguments[i].prototype.initialize = function() {};
// the line below makes sure that the new class has a
// superclass
extended = new arguments[i];
// restore the original initialize method
arguments[i].prototype.initialize = initialize;
}
// get the prototype of the superclass
parent = arguments[i].prototype;
} else {

15
tests/BaseTypes/Class.html
View File

@@ -263,7 +263,22 @@
t.eq( objC.mixed, true, "class C has mixin properties" );
}
function test_Class_isInstanceOf(t) {
t.plan(7);
var wfs = new OpenLayers.Layer.WFS({});
var drag = new OpenLayers.Control.DragFeature({});
t.ok(wfs instanceof OpenLayers.Layer.WFS, "isInstanceOf(WFS)");
t.ok(wfs instanceof OpenLayers.Layer, "isInstanceOf(Layer)");
t.ok(!(wfs instanceof OpenLayers.Format), "not isInstanceOf(Format)");
t.ok(drag instanceof OpenLayers.Control, "drag is a control");
t.ok(!(drag instanceof OpenLayers.Layer), "drag is not a layer");
//test a class with multiple inheritance
var BadClass=OpenLayers.Class(OpenLayers.Layer.WFS, OpenLayers.Control.DragFeature);
var bad = new BadClass({});
t.ok(!(bad instanceof OpenLayers.Control), "bad is a control, but it is also a layer and we cannot have two superclasses");
t.ok(bad instanceof OpenLayers.Layer, "bad is a layer, it inherits from the layer first");
}
</script>
</head>
<body>