/*
 * Ext JS Library 2.0 Copyright(c) 2006-2007, Ext JS, LLC. licensing@extjs.com
 * 
 * http://extjs.com/license
 */

/**
 * @class Ext.form.TextArea
 * @extends Ext.form.TextField Multiline text field. Can be used as a direct
 *          replacement for traditional textarea fields, plus adds support for
 *          auto-sizing.
 * @constructor Creates a new TextArea
 * @param {Object}
 *            config Configuration options
 */
Ext.form.TextArea = Ext.extend(Ext.form.TextField, {
			/**
			 * @cfg {Number} growMin The minimum height to allow when grow =
			 *      true (defaults to 60)
			 */
			growMin : 60,
			/**
			 * @cfg {Number} growMax The maximum height to allow when grow =
			 *      true (defaults to 1000)
			 */
			growMax : 1000,
			growAppend : ' \n ',
			growPad : 0,

			enterIsSpecial : false,

			/**
			 * @cfg {Boolean} preventScrollbars True to prevent scrollbars from
			 *      appearing regardless of how much text is in the field
			 *      (equivalent to setting overflow: hidden, defaults to false)
			 */
			preventScrollbars : false,
			/**
			 * @cfg {String/Object} autoCreate A DomHelper element spec, or true
			 *      for a default element spec (defaults to {tag: "textarea",
			 *      style: "width:100px;height:60px;", autocomplete: "off"})
			 */

			// private
			onRender : function(ct, position) {
				if (!this.el) {
					this.defaultAutoCreate = {
						tag : "textarea",
						style : "width:100px;height:60px;",
						autocomplete : "off"
					};
				}
				Ext.form.TextArea.superclass.onRender.call(this, ct, position);
				if (this.grow) {
					this.textSizeEl = Ext.DomHelper.append(document.body, {
								tag : "pre",
								cls : "x-form-grow-sizer"
							});
					if (this.preventScrollbars) {
						this.el.setStyle("overflow", "hidden");
					}
					this.el.setHeight(this.growMin);
				}
			},

			onDestroy : function() {
				if (this.textSizeEl) {
					Ext.removeNode(this.textSizeEl);
				}
				Ext.form.TextArea.superclass.onDestroy.call(this);
			},

			fireKey : function(e) {
				if (e.isSpecialKey()
						&& (this.enterIsSpecial || (e.getKey() != e.ENTER || e
								.hasModifier()))) {
					this.fireEvent("specialkey", this, e);
				}
			},

			// private
			onKeyUp : function(e) {
				if (!e.isNavKeyPress() || e.getKey() == e.ENTER) {
					this.autoSize();
				}
			},

			/**
			 * Automatically grows the field to accomodate the height of the
			 * text up to the maximum field height allowed. This only takes
			 * effect if grow = true, and fires the autosize event if the height
			 * changes.
			 */
			autoSize : function() {
				if (!this.grow || !this.textSizeEl) {
					return;
				}
				var el = this.el;
				var v = el.dom.value;
				var ts = this.textSizeEl;
				ts.innerHTML = '';
				ts.appendChild(document.createTextNode(v));
				v = ts.innerHTML;

				Ext.fly(ts).setWidth(this.el.getWidth());
				if (v.length < 1) {
					v = "&#160;&#160;";
				} else {
					if (Ext.isIE) {
						v = v.replace(/\n/g, '<p>&#160;</p>');
					}
					v += this.growAppend;
				}
				ts.innerHTML = v;
				var h = Math.min(this.growMax, Math.max(ts.offsetHeight,
								this.growMin)
								+ this.growPad);
				if (h != this.lastHeight) {
					this.lastHeight = h;
					this.el.setHeight(h);
					this.fireEvent("autosize", this, h);
				}
			}
		});
Ext.reg('textarea', Ext.form.TextArea);