/**
 * NativeListBox.js
 *
 * Copyright, Moxiecode Systems AB
 * Released under LGPL License.
 *
 * License: http://www.tinymce.com/license
 * Contributing: http://www.tinymce.com/contributing
 */

(function(tinymce) {
	var DOM = tinymce.DOM, Event = tinymce.dom.Event, each = tinymce.each, Dispatcher = tinymce.util.Dispatcher, undef;

	/**
	 * This class is used to create list boxes/select list. This one will generate
	 * a native control the way that the browser produces them by default.
	 *
	 * @class tinymce.ui.NativeListBox
	 * @extends tinymce.ui.ListBox
	 */
	tinymce.create('tinymce.ui.NativeListBox:tinymce.ui.ListBox', {
		/**
		 * Constructs a new button control instance.
		 *
		 * @constructor
		 * @method NativeListBox
		 * @param {String} id Button control id for the button.
		 * @param {Object} s Optional name/value settings object.
		 */
		NativeListBox : function(id, s) {
			this.parent(id, s);
			this.classPrefix = 'mceNativeListBox';
		},

		/**
		 * Sets the disabled state for the control. This will add CSS classes to the
		 * element that contains the control. So that it can be disabled visually.
		 *
		 * @method setDisabled
		 * @param {Boolean} s Boolean state if the control should be disabled or not.
		 */
		setDisabled : function(s) {
			DOM.get(this.id).disabled = s;
			this.setAriaProperty('disabled', s);
		},

		/**
		 * Returns true/false if the control is disabled or not. This is a method since you can then
		 * choose to check some class or some internal bool state in subclasses.
		 *
		 * @method isDisabled
		 * @return {Boolean} true/false if the control is disabled or not.
		 */
		isDisabled : function() {
			return DOM.get(this.id).disabled;
		},

		/**
		 * Selects a item/option by value. This will both add a visual selection to the
		 * item and change the title of the control to the title of the option.
		 *
		 * @method select
		 * @param {String/function} va Value to look for inside the list box or a function selector.
		 */
		select : function(va) {
			var t = this, fv, f;

			if (va == undef)
				return t.selectByIndex(-1);

			// Is string or number make function selector
			if (va && typeof(va)=="function")
				f = va;
			else {
				f = function(v) {
					return v == va;
				};
			}

			// Do we need to do something?
			if (va != t.selectedValue) {
				// Find item
				each(t.items, function(o, i) {
					if (f(o.value)) {
						fv = 1;
						t.selectByIndex(i);
						return false;
					}
				});

				if (!fv)
					t.selectByIndex(-1);
			}
		},

		/**
		 * Selects a item/option by index. This will both add a visual selection to the
		 * item and change the title of the control to the title of the option.
		 *
		 * @method selectByIndex
		 * @param {String} idx Index to select, pass -1 to select menu/title of select box.
		 */
		selectByIndex : function(idx) {
			DOM.get(this.id).selectedIndex = idx + 1;
			this.selectedValue = this.items[idx] ? this.items[idx].value : null;
		},

		/**
		 * Adds a option item to the list box.
		 *
		 * @method add
		 * @param {String} n Title for the new option.
		 * @param {String} v Value for the new option.
		 * @param {Object} o Optional object with settings like for example class.
		 */
		add : function(n, v, a) {
			var o, t = this;

			a = a || {};
			a.value = v;

			if (t.isRendered())
				DOM.add(DOM.get(this.id), 'option', a, n);

			o = {
				title : n,
				value : v,
				attribs : a
			};

			t.items.push(o);
			t.onAdd.dispatch(t, o);
		},

		/**
		 * Executes the specified callback function for the menu item. In this case when the user clicks the menu item.
		 *
		 * @method getLength
		 */
		getLength : function() {
			return this.items.length;
		},

		/**
		 * Renders the list box as a HTML string. This method is much faster than using the DOM and when
		 * creating a whole toolbar with buttons it does make a lot of difference.
		 *
		 * @method renderHTML
		 * @return {String} HTML for the list box control element.
		 */
		renderHTML : function() {
			var h, t = this;

			h = DOM.createHTML('option', {value : ''}, '-- ' + t.settings.title + ' --');

			each(t.items, function(it) {
				h += DOM.createHTML('option', {value : it.value}, it.title);
			});

			h = DOM.createHTML('select', {id : t.id, 'class' : 'mceNativeListBox', 'aria-labelledby': t.id + '_aria'}, h);
			h += DOM.createHTML('span', {id : t.id + '_aria', 'style': 'display: none'}, t.settings.title);
			return h;
		},

		/**
		 * Post render handler. This function will be called after the UI has been
		 * rendered so that events can be added.
		 *
		 * @method postRender
		 */
		postRender : function() {
			var t = this, ch, changeListenerAdded = true;

			t.rendered = true;

			function onChange(e) {
				var v = t.items[e.target.selectedIndex - 1];

				if (v && (v = v.value)) {
					t.onChange.dispatch(t, v);

					if (t.settings.onselect)
						t.settings.onselect(v);
				}
			};

			Event.add(t.id, 'change', onChange);

			// Accessibility keyhandler
			Event.add(t.id, 'keydown', function(e) {
				var bf, DOM_VK_LEFT = 37, DOM_VK_RIGHT = 39, DOM_VK_UP = 38, DOM_VK_DOWN = 40, DOM_VK_RETURN = 13, DOM_VK_SPACE = 32;

				Event.remove(t.id, 'change', ch);
				changeListenerAdded = false;

				bf = Event.add(t.id, 'blur', function() {
					if (changeListenerAdded) return;
					changeListenerAdded = true;
					Event.add(t.id, 'change', onChange);
					Event.remove(t.id, 'blur', bf);
				});

				if (e.keyCode == DOM_VK_RETURN || e.keyCode == DOM_VK_SPACE) {
					onChange(e);
					return Event.cancel(e);
				} else if (e.keyCode == DOM_VK_DOWN || e.keyCode == DOM_VK_UP) {
					// allow native implementation (navigate select element options)
					e.stopImmediatePropagation();
				}
			});

			t.onPostRender.dispatch(t, DOM.get(t.id));
		}
	});
})(tinymce);