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andro.js
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andro.js
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;(function(exports) {
exports.andro = {
// Shuts down and removes ALL behaviours from passed owner object
tearDown: function(owner) {
if(isSetup(owner)) {
this.eventer(owner).unbindAll();
delete owner.andro; // remove andro from owner object
}
},
// Adds the passed behaviour to the passed owner
augment: function(owner, behaviourMixin, settings) {
if(behaviourMixin === undefined) {
throw "You must pass a behaviour with which to augment the owner.";
}
setupIfNotSetup(owner);
var behaviour = {};
owner.andro.behaviours.push(behaviour);
extend(behaviour, behaviourMixin);
// write exports to owner
if(behaviour.setup !== undefined) {
settings = settings || {};
var exports = behaviour.setup(owner, owner.andro.eventer, settings);
for(var name in exports) {
if(owner[name] === undefined) {
owner[name] = makeFn(exports[name], behaviour);
}
else {
throw "Behaviour export would overwrite existing attribute on owner.";
}
}
}
},
// Returns eventer obj for passed owner object
eventer: function(owner) {
setupIfNotSetup(owner);
return owner.andro.eventer;
}
};
// Sets up the passed owner object to use behaviours
var setupIfNotSetup = function(owner) {
if (!isSetup(owner)) {
owner.andro = {};
owner.andro.behaviours = [];
owner.andro.eventer = new Eventer();
}
};
// Returns true if owner has andro obj on it.
var isSetup = function(owner) {
return owner.andro !== undefined;
};
var extend = function(target, extensions) {
for(var property in extensions) {
if(extensions[property] && extensions[property].constructor &&
extensions[property].constructor === Object) {
target[property] = extend(target[property] || {}, extensions[property]);
}
else {
target[property] = extensions[property];
}
}
return target;
};
var makeFn = function(fn, behaviour) {
return function() {
return fn.apply(behaviour, arguments);
};
};
function Eventer() {
this.callbacks = {};
}
Eventer.prototype = {
bind: function(obj, event, callback) {
this.callbacks[event] = this.callbacks[event] || [];
this.callbacks[event].push({
obj: obj,
callback: callback
});
return this;
},
unbind: function(obj, event) {
for(var i = 0; i < this.callbacks[event].length; i++) {
if(this.callbacks[event][i].obj === obj) {
this.callbacks[event].splice(i, 1);
break;
}
}
},
unbindAll: function() {
for(var i in this.callbacks) {
delete this.callbacks[i];
}
},
emit: function(event, data) {
this.dispatch(event, data);
return this;
},
dispatch: function(event, data) {
var callbacks = this.callbacks[event];
if(callbacks !== undefined) {
for(var i = 0; i < callbacks.length; i++) {
var callbackObj = callbacks[i];
callbackObj.callback.call(callbackObj.obj, data);
}
}
}
};
})(this);