source: Dev/trunk/src/client/dojox/mobile/_DatePickerMixin.js

define([
        "dojo/_base/array",
        "dojo/_base/declare",
        "dojo/_base/lang",
        "dojo/date",
        "dojo/date/locale",
        "dojo/date/stamp"
], function(array, declare, lang, ddate, datelocale, datestamp){

        // module:
        //              dojox/mobile/_DatePickerMixin

        var slotMixin = {
                format: function(/*Date*/d){
                        return datelocale.format(d, {datePattern:this.pattern, selector:"date"});
                }
        };

        var yearSlotMixin = lang.mixin({
                initLabels: function(){
                        this.labels = [];
                        if(this.labelFrom !== this.labelTo){
                                var d = new Date(this.labelFrom, 0, 1);
                                var i, idx;
                                for(i = this.labelFrom, idx = 0; i <= this.labelTo; i++, idx++){
                                        d.setFullYear(i);
                                        this.labels.push(this.format(d));
                                }
                        }
                }
        }, slotMixin);

        var monthSlotMixin = lang.mixin({
                initLabels: function(){
                        this.labels = [];
                        // On certain BlackBerry devices, we need to init to 16 not 1 to avoid some devices bugs (see #15677)
                        var d = new Date(2000, 0, 16);
                        for(var i = 0; i < 12; i++){
                                d.setMonth(i);
                                this.labels.push(this.format(d));
                        }
                }
        }, slotMixin);

        var daySlotMixin = lang.mixin({
                initLabels: function(){
                        this.labels = [];
                        var d = new Date(2000, 0, 1);
                        for(var i = 1; i <= 31; i++){
                                d.setDate(i);
                                this.labels.push(this.format(d));
                        }
                }
        }, slotMixin);

        return declare("dojox.mobile._DatePickerMixin", null, {
                // summary:
                //              A mixin for date picker widget.

                // yearPattern: String
                //              A pattern to be used to format year.
                yearPattern: "yyyy",

                // monthPattern: String
                //              A pattern to be used to format month.
                monthPattern: "MMM",

                // dayPattern: String
                //              A pattern to be used to format day.
                dayPattern: "d",
                
                /*=====
                // value: String
                //              A string representing the date value.
                //              The setter of this property first converts the value argument by calling 
                //              the fromISOString method of the dojo/date/stamp module, then sets the 
                //              values of the picker according to the resulting Date object. 
                //              If the string cannot be parsed by fromISOString, the method does nothing.
                //              Example: set("value", "2012-1-20"); // January 20, 2012
                //              The getter returns the string formatted as described in the dojo/date/stamp 
                //              module.
                value: "",
                =====*/
                
                initSlots: function(){
                        // summary:
                        //              Initializes the slots.
                        var c = this.slotClasses, p = this.slotProps;
                        c[0] = declare(c[0], yearSlotMixin);
                        c[1] = declare(c[1], monthSlotMixin);
                        c[2] = declare(c[2], daySlotMixin);
                        p[0].pattern = this.yearPattern;
                        p[1].pattern = this.monthPattern;
                        p[2].pattern = this.dayPattern;
                        this.reorderSlots();
                },

                reorderSlots: function(){
                        // summary:
                        //              Reorders the slots.                     
                        if(this.slotOrder.length){ return; }
                        var a = datelocale._parseInfo().bundle["dateFormat-short"].toLowerCase().split(/[^ymd]+/, 3);
                        this.slotOrder = array.map(a, function(pat){
                                return {y:0, m:1, d:2}[pat.charAt(0)];
                        });
                },

                reset: function(){
                        // summary:
                        //              Goes to today.
                        var now = new Date();
                        var v = array.map(this.slots, function(w){ return w.format(now); });
                        this.set("colors", v);
                        this._disableEndDaysOfMonth();
                        if(this.value){
                                this.set("value", this.value);
                                this.value = null;
                        }else if(this.values){
                                this.set("values", this.values);
                                this.values = null;
                        }else{
                                this.set("values", v);
                        }
                },

                _onYearSet: function(){
                        // summary:
                        //              An internal handler called when the year value is changed.
                        // tags:
                        //              private
                        var slot = this.slots[0];
                        var newValue = slot.get("value");
                        if(!(slot._previousValue && newValue == slot._previousValue)){ // do nothing if the value is unchanged
                                this._disableEndDaysOfMonth();
                                slot._previousValue = newValue;
                                slot._set("value", newValue);
                                this.onYearSet();
                        }
                },
                
                onYearSet: function(){
                        // summary:
                        //              A handler called when the year value is changed.
                },

                _onMonthSet: function(){
                        // summary:
                        //              An internal handler called when the month value is changed.
                        // tags:
                        //              private
                        var slot = this.slots[1];
                        var newValue = slot.get("value");
                        if(!(slot._previousValue && newValue == slot._previousValue)){ // do nothing if the value is unchanged
                                this._disableEndDaysOfMonth();
                                slot._previousValue = newValue;
                                slot._set("value", newValue); // notify watches
                                this.onMonthSet();
                        }
                },

                onMonthSet: function(){
                        // summary:
                        //              A handler called when the month value is changed.
                },

                _onDaySet: function(){
                        // summary:
                        //              An internal handler called when the day value is changed.
                        // tags:
                        //              private
                        var slot = this.slots[2];
                        var newValue = slot.get("value");
                        if(!(slot._previousValue && newValue == slot._previousValue)){ // do nothing if the value is unchanged
                                if(!this._disableEndDaysOfMonth()){
                                        // If _disableEndDaysOfMonth has changed the day value,
                                        // skip notifications till next call of _onDaySet, to
                                        // avoid the extra notification for the (invalid)
                                        // intermediate value of the day.
                                        slot._previousValue = newValue;
                                        slot._set("value", newValue); // notify watches
                                        this.onDaySet();
                                }
                        }
                },

                onDaySet: function(){
                        // summary:
                        //              A handler called when the day value is changed.
                },

                _disableEndDaysOfMonth: function(){
                        // summary:
                        //              Disables the end days of the month to match the specified
                        //              number of days of the month. Returns true if the day value is changed.
                        // tags:
                        //              private
                        var pat = this.slots[0].pattern + "/" + this.slots[1].pattern,
                                v = this.get("values"),
                                date = datelocale.parse(v[0] + "/" + v[1], {datePattern:pat, selector:"date"}),
                                daysInMonth = ddate.getDaysInMonth(date);
                        var changedDay = false;
                        if(daysInMonth < v[2]){
                                // day value is invalid for this month, change it
                                changedDay = true;
                                this.slots[2]._spinToValue(daysInMonth, false/*applyValue*/);
                        }
                        this.disableValues(daysInMonth);
                        return changedDay;
                },

                _getDateAttr: function(){
                        // summary:
                        //              Returns a Date object for the current values.
                        // tags:
                        //              private
                        var v = this.get("values"), // [year, month, day]
                                s = this.slots,
                                pat = s[0].pattern + "/" + s[1].pattern + "/" + s[2].pattern;
                                return datelocale.parse(v[0] + "/" + v[1] + "/" + v[2], {datePattern:pat, selector:"date"});
                },

                _setValuesAttr: function(/*Array*/values){
                        // summary:
                        //              Sets the current date as an array of values.
                        // description:
                        //              This method takes an array that consists of three values,
                        //              year, month, and day. If the values are integer, they are
                        //              formatted to locale-specific strings before setting them to
                        //              the slots. Month starts from 1 to 12 (Ex. 1 - Jan, 2 - Feb, etc.)
                        //              If the values are NOT integer, they are directly
                        //              passed to the setter of the slots without formatting.
                        //
                        // example:
                        //      |       set("values", [2012, 1, 20]); // January 20, 2012
                        // tags:
                        //              private
                        array.forEach(this.getSlots(), function(w, i){
                                var v = values[i];
                                if(typeof v == "number"){
                                        var arr = [1970, 1, 1];
                                        arr.splice(i, 1, v - 0);
                                        v = w.format(new Date(arr[0], arr[1] - 1, arr[2]));
                                }
                                w.set("value", v);
                        });
                },
                
                _setValueAttr: function(/*String*/value){
                        // summary:
                        //              Sets the current date as an String formatted according to a subset of the ISO-8601 standard.
                        // description:
                        //              This method first converts the value argument by calling the fromISOString method of
                        //              the dojo/date/stamp module, then sets the values of the picker according to the resulting
                        //              Date object. If the string cannot be parsed by fromISOString, the method does nothing.
                        // value:
                        //              A string formatted as described in the dojo/date/stamp module.
                        // example:
                        //      |       set("value", "2012-1-20"); // January 20, 2012
                        // tags:
                        //              private                 
                        var date = datestamp.fromISOString(value);
                        this.set("values", array.map(this.slots, function(w){ return w.format(date); }));
                },
                
                _getValueAttr: function(){
                        // summary:
                        //              Gets the current date as a String formatted according to a subset of the ISO-8601 standard.
                        // returns: String
                        //              A string formatted as described in the dojo/date/stamp module.
                        // tags:
                        //              private                 
                        return datestamp.toISOString(this.get("date"), { selector: "date" });
                }               
        });
});