140 lines
2.5 KiB
JavaScript
140 lines
2.5 KiB
JavaScript
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var LotIface = require('./lot-iface');
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var Type = require('./type');
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var Value = require('./value');
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/**
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* A value holder, it emits the changed signal when value is changed.
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* Also it can be linked with a lot value or another parameter.
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*/
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module.exports = new Class({
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Properties: {
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/**
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* The parameter value.
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*/
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value: {
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type: null
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},
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/**
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* The parameter type.
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*/
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type: {
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type: Type
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},
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/**
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* Another parameter to bind with.
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*/
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param: {
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type: Object
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},
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/**
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* A lot to bind with.
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*/
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lot: {
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type: LotIface
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},
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/**
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* The field name in the lot.
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*/
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name: {
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type: String
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},
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/**
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* Determines whether the link to the lot is unidirectional, ie, a
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* change in the lot updates the parameter but not viceversa.
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*/
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oneWay: {
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type: Boolean
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}
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}
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,_value: undefined
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,_type: null
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,_param: null
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,_lot: null
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,_sourceLock: false
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,_name: null
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,_oneWay: false
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,_setValue(newValue) {
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if (this._putValue(newValue))
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this._notifyChanges();
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}
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,_putValue(newValue) {
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if (Value.simpleEquals(newValue, this._value))
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return false;
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this._value = Value.simpleClone(newValue);
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return true;
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}
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,_notifyChanges() {
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this._refreshLot();
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this._refreshParam();
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this.emit('changed', this._value);
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}
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,_setType(type) {
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this._type = type;
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this._onLotChange();
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}
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,_onSourceChange(newValue) {
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if (this._oneTime && this._value !== undefined)
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return;
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this._sourceLock = true;
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this._setValue(newValue);
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this._sourceLock = false;
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}
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,_setParam(param) {
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this.link({_lot: null});
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this.link({_param: param}, {changed: this._onParamChange});
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this._refreshParam();
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}
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,_onParamChange() {
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if (this._sourceLock || !this._param) return;
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this._onSourceChange(this._param.value);
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}
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,_refreshParam() {
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if (this._sourceLock || !this._param || this._oneWay)
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return;
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this._sourceLock = true;
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this._param.value = this._value;
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this._sourceLock = false;
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}
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,_setLot(lot) {
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this.link({_param: null});
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this.link({_lot: lot}, {change: this._onLotChange});
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this._onLotChange();
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}
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,_onLotChange() {
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if (this._sourceLock || !this._lot || !this._name)
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return;
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var newValue = this._lot.get(this._name, this._type);
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this._onSourceChange(newValue);
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}
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,_refreshLot() {
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if (this._sourceLock || !this._name || !this._lot || this._oneWay)
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return;
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this._sourceLock = true;
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this._lot.set(this._name, this._value);
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this._sourceLock = false;
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}
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,_setName(name) {
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this._name = name;
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this._onLotChange();
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}
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});
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