/**
 * JavaScript for the SwatTileView widget
 *
 * @param id string Id of the matching {@link SwatTileView}.
 */
function SwatTileView(id)
{
	SwatTileView.superclass.constructor.call(this, id);
	this.init();
}

YAHOO.lang.extend(SwatTileView, SwatView, {

/**
 * Gets an item node in a tile view
 *
 * The item node is the parent div one level below the root tile view
 * element.
 *
 * @param DOMElement node the arbitrary descendant node.
 *
 * @return DOMElement the item node.
 */
getItemNode: function(node)
{
	var tile_node = node;

	// search for containing tile element
	while (tile_node.parentNode !== this.view_node &&
		tile_node.nodeName != 'BODY')
		tile_node = tile_node.parentNode;

	// we reached the body element without finding the tile node
	if (tile_node.nodeName == 'BODY')
		tile_node = node;

	return tile_node;
}

});

SwatTileView.prototype.init = function()
{
	this.items = [];
	this.view_node = document.getElementById(this.id);

	for (var i = 0; i < this.view_node.childNodes.length; i++) {
		var node_name = this.view_node.childNodes[i].nodeName.toLowerCase();
		if (node_name == 'div') {
			this.items.push(this.view_node.childNodes[i]);
		}
	}
}

/**
 * Selects an item node in this tile view
 *
 * For tile views, this method also highlights selected tiles.
 *
 * @param DOMElement node an arbitrary descendant node of the item node to be
 *                         selected.
 * @param String selector an identifier of the object that selected the item
 *                         node.
 */
SwatTileView.prototype.selectItem = function(node, selector)
{
	SwatTileView.superclass.selectItem.call(this, node, selector);

	var tile_node = this.getItemNode(node);
	if (this.isSelected(tile_node) &&
		!YAHOO.util.Dom.hasClass(tile_node, 'highlight')) {
		YAHOO.util.Dom.addClass(tile_node, 'highlight');
	}
}

/**
 * Deselects an item node in this tile view
 *
 * For tile views, this method also unhighlights deselected tiles.
 *
 * @param DOMElement node an arbitrary descendant node of the item node to be
 *                         deselected.
 * @param String selector an identifier of the object that deselected the item
 *                         node.
 */
SwatTileView.prototype.deselectItem = function(node, selector)
{
	SwatTileView.superclass.deselectItem.call(this, node, selector);

	var tile_node = this.getItemNode(node);
	if (!this.isSelected(tile_node) &&
		YAHOO.util.Dom.hasClass(tile_node, 'highlight')) {
		YAHOO.util.Dom.removeClass(tile_node, 'highlight');
	}
}