define(['../Evented', '../_base/lang', './util'], function(Evented, lang, util){
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// module:
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// dojo/request/notify
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// summary:
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// Global notification API for dojo/request. Notifications will
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// only be emitted if this module is required.
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//
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// | require('dojo/request', 'dojo/request/notify',
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// | function(request, notify){
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// | notify('load', function(response){
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// | if(response.url === 'someUrl.html'){
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// | console.log('Loaded!');
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// | }
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// | });
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// | request.get('someUrl.html');
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// | }
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// | );
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var pubCount = 0,
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slice = [].slice;
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var hub = lang.mixin(new Evented, {
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onsend: function(data){
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if(!pubCount){
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this.emit('start');
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}
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pubCount++;
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},
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_onload: function(data){
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this.emit('done', data);
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},
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_onerror: function(data){
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this.emit('done', data);
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},
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_ondone: function(data){
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if(--pubCount <= 0){
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pubCount = 0;
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this.emit('stop');
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}
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},
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emit: function(type, event){
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var result = Evented.prototype.emit.apply(this, arguments);
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// After all event handlers have run, run _on* handler
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if(this['_on' + type]){
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this['_on' + type].apply(this, slice.call(arguments, 1));
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}
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return result;
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}
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});
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function notify(type, listener){
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// summary:
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// Register a listener to be notified when an event
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// in dojo/request happens.
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// type: String?
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// The event to listen for. Events emitted: "start", "send",
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// "load", "error", "done", "stop".
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// listener: Function?
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// A callback to be run when an event happens.
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// returns:
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// A signal object that can be used to cancel the listener.
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// If remove() is called on this signal object, it will
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// stop the listener from being executed.
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return hub.on(type, listener);
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}
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notify.emit = function(type, event, cancel){
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return hub.emit(type, event, cancel);
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};
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// Attach notify to dojo/request/util to avoid
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// try{ require('./notify'); }catch(e){}
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return util.notify = notify;
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});
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