[76] | 1 | /* Copyright (c) 2006-2010 by OpenLayers Contributors (see authors.txt for |
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| 2 | * full list of contributors). Published under the Clear BSD license. |
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| 3 | * See http://svn.openlayers.org/trunk/openlayers/license.txt for the |
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| 4 | * full text of the license. */ |
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| 5 | |
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| 6 | /** |
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| 7 | * Constructor: OpenLayers.Class |
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| 8 | * Base class used to construct all other classes. Includes support for |
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| 9 | * multiple inheritance. |
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| 10 | * |
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| 11 | * This constructor is new in OpenLayers 2.5. At OpenLayers 3.0, the old |
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| 12 | * syntax for creating classes and dealing with inheritance |
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| 13 | * will be removed. |
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| 14 | * |
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| 15 | * To create a new OpenLayers-style class, use the following syntax: |
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| 16 | * > var MyClass = OpenLayers.Class(prototype); |
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| 17 | * |
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| 18 | * To create a new OpenLayers-style class with multiple inheritance, use the |
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| 19 | * following syntax: |
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| 20 | * > var MyClass = OpenLayers.Class(Class1, Class2, prototype); |
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| 21 | * Note that instanceof reflection will only reveil Class1 as superclass. |
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| 22 | * Class2 ff are mixins. |
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| 23 | * |
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| 24 | */ |
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| 25 | OpenLayers.Class = function() { |
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| 26 | var Class = function() { |
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| 27 | /** |
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| 28 | * This following condition can be removed at 3.0 - this is only for |
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| 29 | * backwards compatibility while the Class.inherit method is still |
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| 30 | * in use. So at 3.0, the following three lines would be replaced with |
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| 31 | * simply: |
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| 32 | * this.initialize.apply(this, arguments); |
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| 33 | */ |
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| 34 | if (arguments && arguments[0] != OpenLayers.Class.isPrototype) { |
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| 35 | this.initialize.apply(this, arguments); |
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| 36 | } |
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| 37 | }; |
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| 38 | var extended = {}; |
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| 39 | var parent, initialize, Type; |
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| 40 | for(var i=0, len=arguments.length; i<len; ++i) { |
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| 41 | Type = arguments[i]; |
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| 42 | if(typeof Type == "function") { |
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| 43 | // make the class passed as the first argument the superclass |
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| 44 | if(i == 0 && len > 1) { |
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| 45 | initialize = Type.prototype.initialize; |
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| 46 | // replace the initialize method with an empty function, |
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| 47 | // because we do not want to create a real instance here |
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| 48 | Type.prototype.initialize = function() {}; |
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| 49 | // the line below makes sure that the new class has a |
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| 50 | // superclass |
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| 51 | extended = new Type(); |
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| 52 | // restore the original initialize method |
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| 53 | if(initialize === undefined) { |
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| 54 | delete Type.prototype.initialize; |
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| 55 | } else { |
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| 56 | Type.prototype.initialize = initialize; |
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| 57 | } |
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| 58 | } |
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| 59 | // get the prototype of the superclass |
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| 60 | parent = Type.prototype; |
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| 61 | } else { |
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| 62 | // in this case we're extending with the prototype |
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| 63 | parent = Type; |
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| 64 | } |
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| 65 | OpenLayers.Util.extend(extended, parent); |
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| 66 | } |
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| 67 | Class.prototype = extended; |
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| 68 | return Class; |
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| 69 | }; |
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| 70 | |
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| 71 | /** |
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| 72 | * Property: isPrototype |
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| 73 | * *Deprecated*. This is no longer needed and will be removed at 3.0. |
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| 74 | */ |
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| 75 | OpenLayers.Class.isPrototype = function () {}; |
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| 76 | |
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| 77 | /** |
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| 78 | * APIFunction: OpenLayers.create |
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| 79 | * *Deprecated*. Old method to create an OpenLayers style class. Use the |
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| 80 | * <OpenLayers.Class> constructor instead. |
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| 81 | * |
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| 82 | * Returns: |
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| 83 | * An OpenLayers class |
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| 84 | */ |
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| 85 | OpenLayers.Class.create = function() { |
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| 86 | return function() { |
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| 87 | if (arguments && arguments[0] != OpenLayers.Class.isPrototype) { |
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| 88 | this.initialize.apply(this, arguments); |
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| 89 | } |
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| 90 | }; |
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| 91 | }; |
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| 92 | |
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| 93 | |
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| 94 | /** |
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| 95 | * APIFunction: inherit |
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| 96 | * *Deprecated*. Old method to inherit from one or more OpenLayers style |
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| 97 | * classes. Use the <OpenLayers.Class> constructor instead. |
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| 98 | * |
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| 99 | * Parameters: |
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| 100 | * class - One or more classes can be provided as arguments |
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| 101 | * |
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| 102 | * Returns: |
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| 103 | * An object prototype |
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| 104 | */ |
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| 105 | OpenLayers.Class.inherit = function () { |
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| 106 | var superClass = arguments[0]; |
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| 107 | var proto = new superClass(OpenLayers.Class.isPrototype); |
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| 108 | for (var i=1, len=arguments.length; i<len; i++) { |
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| 109 | if (typeof arguments[i] == "function") { |
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| 110 | var mixin = arguments[i]; |
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| 111 | arguments[i] = new mixin(OpenLayers.Class.isPrototype); |
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| 112 | } |
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| 113 | OpenLayers.Util.extend(proto, arguments[i]); |
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| 114 | } |
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| 115 | return proto; |
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| 116 | }; |
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