source: Dev/trunk/src/client/dojox/form/BusyButton.js

define([
        "dojo/_base/lang",
        "dojo/dom-attr",
        "dojo/dom-class",
        "dijit/form/Button",
        "dijit/form/DropDownButton",
        "dijit/form/ComboButton",
        "dojo/i18n",
        "dojo/i18n!dijit/nls/loading",
        "dojo/_base/declare"
], function(lang, domAttr, domClass, Button, DropDownButton, ComboButton, i18n, nlsLoading, declare){

var _BusyButtonMixin = declare("dojox.form._BusyButtonMixin", null, {

        // isBusy: Boolean
        isBusy: false,
        
        // busyLabel: String
        //              text while button is busy
        busyLabel: "",
        
        timeout: null, // timeout, should be controlled by xhr call
        
        // useIcon: Boolean
        //              use a busy icon
        useIcon: true,

        postMixInProperties: function(){
                this.inherited(arguments);
                if(!this.busyLabel){
                        this.busyLabel = i18n.getLocalization("dijit", "loading", this.lang).loadingState;
                }
        },

        postCreate: function(){
                // summary:
                //              stores initial label and timeout for reference
                this.inherited(arguments);
                this._label = this.containerNode.innerHTML;
                this._initTimeout = this.timeout;

                // for initial busy buttons
                if(this.isBusy){
                        this.makeBusy();
                }
        },

        makeBusy: function(){
                // summary:
                //              sets state from idle to busy
                this.isBusy = true;
                this.set("disabled", true);

                this.setLabel(this.busyLabel, this.timeout);
        },

        cancel: function(){
                // summary:
                //              if no timeout is set or for other reason the user can put the button back
                //              to being idle
                this.set("disabled", false);
                this.isBusy = false;
                this.setLabel(this._label);
                if(this._timeout){      clearTimeout(this._timeout); }
                this.timeout = this._initTimeout;
        },

        resetTimeout: function(/*Int*/ timeout){
                // summary:
                //              to reset existing timeout and setting a new timeout
                if(this._timeout){
                        clearTimeout(this._timeout);
                }

                // new timeout
                if(timeout){
                        this._timeout = setTimeout(lang.hitch(this, function(){
                                this.cancel();
                        }), timeout);
                }else if(timeout == undefined || timeout === 0){
                        this.cancel();
                }
        },

        setLabel: function(/*String*/ content, /*Int*/ timeout){
                // summary:
                //              setting a label and optional timeout of the labels state

                // this.inherited(arguments); FIXME: throws an Unknown runtime error

                // Begin IE hack
                this.label = content;
                // remove children
                while(this.containerNode.firstChild){
                        this.containerNode.removeChild(this.containerNode.firstChild);
                }
                this.containerNode.innerHTML = this.label;

                if(this.showLabel == false && !domAttr.get(this.domNode, "title")){
                        this.titleNode.title=lang.trim(this.containerNode.innerText || this.containerNode.textContent || '');
                }
                // End IE hack

                // setting timeout
                if(timeout){
                        this.resetTimeout(timeout);
                }else{
                        this.timeout = null;
                }

                // create optional busy image
                if(this.useIcon && this.isBusy){
                        var node = new Image();
                        node.src = this._blankGif;
                        domAttr.set(node, "id", this.id+"_icon");
                        domClass.add(node, "dojoxBusyButtonIcon");
                        this.containerNode.appendChild(node);
                }
        },

        _onClick: function(e){
                // summary:
                //              on button click the button state gets changed

                // only do something if button is not busy
                if(!this.isBusy){
                        this.inherited(arguments);      // calls onClick()
                        this.makeBusy();
                }
        }
});

var BusyButton = declare("dojox.form.BusyButton", [Button, _BusyButtonMixin], {
        // summary:
        //              BusyButton is a simple widget which provides implementing more 
        //              user friendly form submission.
        // description:
        //              When a form gets submitted by a user, many times it is recommended to disable
        //              the submit buttons to prevent double submission. BusyButton provides a simple set
        //              of features for this purpose

});
declare("dojox.form.BusyComboButton", [ComboButton, _BusyButtonMixin], {});
declare("dojox.form.BusyDropDownButton", [DropDownButton, _BusyButtonMixin], {});
return BusyButton;
});