Ext.define('uas.override.form.field.ComboBox', {
    override: 'Ext.form.field.ComboBox',

    displayField: 'text',
    valueField: 'value',
    queryMode: 'local',

    // 加载数据后直接将第一行设置为默认值
    selectFirstIfNull: false,

    onLoad: function (store, records, success) {
        var me = this;
        if (!me.value && me.selectFirstIfNull && store.getCount()) {
            var value = store.first().get(me.valueField);
            me.value = me.multiSelect ? [value] : value;
        }
        // This flag is saying that we need to call setValue to match the value property with the
        // just loaded record set and update the valueCollection (and thereby any bound ViewModel)
        // with that matched record.
        var needsValueUpdating = !me.valueCollection.byValue.get(me.value);
        // If not returning from a query, and the value was set from a raw data value, unrelated to a record
        // because the displayField was not honoured when calculating the raw value, then we update
        // the raw value.
        if (success && needsValueUpdating && !me.isPaging && !(store.lastOptions && 'rawQuery' in store.lastOptions)) {
            me.setValueOnData();
        }
        // This synchronizes the value based upon contents of the store
        me.checkValueOnChange();
        me.isPaging = false;
    },

    constructor: function(config) {
        var me = this;
        config = config || {};
        if (!config.store) {
            config.store = {
                fields: [me.displayField, me.valueField],
                data: me.options
            }
        }
        me.callParent([config]);
    },

    setOptions: function(options) {
        var me = this, store = me.getStore();
        if (null == store) {
            me.setStore({
                fields: [me.displayField, me.valueField],
                data: options
            });
        } else {
            store.loadData(options);
        }
    }
});