# TriggerField.js

    /**
     * @class Ext.form.TriggerField
     * @extends Ext.form.TextField
     * Provides a convenient wrapper for TextFields that adds a clickable trigger button (looks like a combobox by default).
     * The trigger has no default action, so you must assign a function to implement the trigger click handler by
     * overriding {@link #onTriggerClick}. You can create a TriggerField directly, as it renders exactly like a combobox
     * for which you can provide a custom implementation.  For example:
     * <pre><code>
    var trigger = new Ext.form.TriggerField();
    trigger.onTriggerClick = myTriggerFn;
    trigger.applyTo('my-field');
    </code></pre>
     *
     * However, in general you will most likely want to use TriggerField as the base class for a reusable component.
     * {@link Ext.form.DateField} and {@link Ext.form.ComboBox} are perfect examples of this.
     * @cfg {String} triggerClass An additional CSS class used to style the trigger button.  The trigger will always get the
     * class 'x-form-trigger' by default and triggerClass will be <b>appended</b> if specified.
     * @constructor
     * Create a new TriggerField.
     * @param {Object} config Configuration options (valid {@Ext.form.TextField} config options will also be applied
     * to the base TextField)
     */
    Ext.form.TriggerField = function(config){
        Ext.form.TriggerField.superclass.constructor.call(this, config);
        this.mimicing = false;
        this.on('disable', this.disableWrapper, this);
        this.on('enable', this.enableWrapper, this);
    };

    Ext.extend(Ext.form.TriggerField, Ext.form.TextField,  {
        /**
         * @cfg {String/Object} autoCreate A DomHelper element spec, or true for a default element spec (defaults to
         * {tag: "input", type: "text", size: "16", autocomplete: "off"})
         */

        // private
        defaultAutoCreate : {tag: "input", type: "text", size: "16", autocomplete: "off"},
        /**
         * @cfg {Boolean} hideTrigger True to hide the trigger element and display only the base text field (defaults to false)
         */
        hideTrigger:false,

        /** @cfg {Boolean} grow @hide */
    // holder
    /*** @cfg {Number} growMin @hide */
    // holder
    /*** @cfg {Number} growMax @hide */
    // holder
    /***
         * @hide
         * @method
         */
        autoSize: Ext.emptyFn,

        monitorTab : true,

        // private
        customSize : true,

        // private
        setSize : function(w, h){
            if(!this.wrap){
                this.width = w;
                this.height = h;
                return;
            }
            if(w){
                var wrapWidth = w;
                w = w - this.trigger.getWidth();
                Ext.form.TriggerField.superclass.setSize.call(this, w, h);
                this.wrap.setWidth(wrapWidth);
                if(this.onResize){
                    this.onResize(wrapWidth, h);
                }
            }else{
                Ext.form.TriggerField.superclass.setSize.call(this, w, h);
                this.wrap.setWidth(this.el.getWidth()+this.trigger.getWidth());
            }
        },

        // private
        alignErrorIcon : function(){
            this.errorIcon.alignTo(this.wrap, 'tl-tr', [2, 0]);
        },

        // private
        onRender : function(ct, position){
            Ext.form.TriggerField.superclass.onRender.call(this, ct, position);
            this.wrap = this.el.wrap({cls: "x-form-field-wrap"});
            this.trigger = this.wrap.createChild({
                tag: "img", src: Ext.BLANK_IMAGE_URL, cls: "x-form-trigger "+this.triggerClass});
            this.trigger.on("click", this.onTriggerClick, this, {preventDefault:true});
            this.trigger.addClassOnOver('x-form-trigger-over');
            this.trigger.addClassOnClick('x-form-trigger-click');
            if(this.hideTrigger){
                this.trigger.setDisplayed(false);
            }
            this.setSize(this.width||'', this.height||'');
        },

        onDestroy : function(){
            if(this.trigger){
                this.trigger.removeAllListeners();
                this.trigger.remove();
            }
            if(this.wrap){
                this.wrap.remove();
            }
            Ext.form.TriggerField.superclass.onDestroy.call(this);
        },

        // private
        onFocus : function(){
            Ext.form.TriggerField.superclass.onFocus.call(this);
            if(!this.mimicing){
                this.mimicing = true;
                Ext.get(Ext.isIE ? document.body : document).on("mousedown", this.mimicBlur, this);
                if(this.monitorTab){
                    this.el.on("keydown", this.checkTab, this);
                }
            }
        },

        // private
        checkTab : function(e){
            if(e.getKey() == e.TAB){
                this.triggerBlur();
            }
        },

        // private
        onBlur : function(){
            // do nothing
        },

        // private
        mimicBlur : function(e, t){
            if(!this.wrap.contains(t) && this.validateBlur()){
                this.triggerBlur();
            }
        },

        // private
        triggerBlur : function(){
            this.mimicing = false;
            Ext.get(Ext.isIE ? document.body : document).un("mousedown", this.mimicBlur);
            if(this.monitorTab){
                this.el.un("keydown", this.checkTab, this);
            }
            Ext.form.TriggerField.superclass.onBlur.call(this);
        },

        // private
        // This should be overriden by any subclass that needs to check whether or not the field can be blurred.
        validateBlur : function(e, t){
            return true;
        },

        // private
        disableWrapper : function(){
            if(this.wrap){
                this.wrap.addClass('x-item-disabled');
            }
        },

        // private
        enableWrapper : function(){
            if(this.wrap){
                this.wrap.removeClass('x-item-disabled');
            }
        },

        // private
        onShow : function(){
            if(this.wrap){
                this.wrap.dom.style.display = '';
                this.wrap.dom.style.visibility = 'visible';
            }
        },

        // private
        onHide : function(){
            this.wrap.dom.style.display = 'none';
        },

        /**
         * The function that should handle the trigger's click event.  This method does nothing by default until overridden
         * by a handler implementation.
         * @method
         * @param {EventObject} e
         */
        onTriggerClick : Ext.emptyFn
    });

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