fgdata/Nasal/canvas/map/WPT.scontroller

# See: http://wiki.flightgear.org/MapStructure
# Class things:
var name = 'WPT';
var parents = [Symbol.Controller];
var __self__ = caller(0)[0];
Symbol.Controller.add(name, __self__);
Symbol.registry[ name ].df_controller = __self__;
var last_idx = nil;

var new = func(symbol, model) {
	var m = {
		parents:[__self__],
		listeners: [],
		symbol: symbol,
		model: model,
	};
	append(m.listeners, setlistener(symbol.layer.options.current_wp_node, func(n) {
		var n = n.getValue();
		if (m.last_idx == model.idx or n == model.idx)
			symbol.update();
		m.last_idx = n;
	}, 0, 0));
	m.last_idx = getprop(symbol.layer.options.current_wp_node);

	return m;
}
var del = func() {
	foreach (var l; me.listeners)
		removelistener(l);
}