/**
 * JavaScript SwatCheckboxList component
 *
 * @param id string Id of the matching {@link SwatCheckboxList} object.
 */
function SwatCheckboxList(id)
{
	this.check_list = [];

	var container = document.getElementById(id);
	var input_elements = container.getElementsByTagName('INPUT');
	for (var i = 0; i < input_elements.length; i++) {
		if (input_elements[i].type == 'checkbox' &&
			input_elements[i].id.substring(0, id.length) == id) {
			this.check_list.push(input_elements[i]);
		}
	}

	this.check_all = null; // a reference to a check-all js object

	for (var i = 0; i < this.check_list.length; i++) {
		YAHOO.util.Event.addListener(this.check_list[i], 'click',
			this.handleClick, this, true);

		YAHOO.util.Event.addListener(this.check_list[i], 'dblclick',
			this.handleClick, this, true);
	}
}

SwatCheckboxList.prototype.handleClick = function(event)
{
	this.updateCheckAll();
}

SwatCheckboxList.prototype.updateCheckAll = function ()
{
	if (this.check_all == null)
		return;

	var count = 0;
	for (var i = 0; i < this.check_list.length; i++)
		if (this.check_list[i].checked)
			count++;
		else if (count > 0)
			break; // can't possibly be all checked or none checked

	this.check_all.setState(count == this.check_list.length);
}

SwatCheckboxList.prototype.checkAll = function(checked)
{
	for (var i = 0; i < this.check_list.length; i++)
		this.check_list[i].checked = checked;
}