widget ViewportControls {
	layout = HBox;

	[hexpand hfill] new VBox {
		new Label { text = "zoom"; fontSize = 10; }
		new FloatInputSpinner zoom;
	}

	[hexpand hfill] new VBox {
		new Label { text = "x offset"; fontSize = 10; }
		new FloatInputSpinner xoff;
	}

	[hexpand hfill] new VBox {
		new Label { text = "y offset"; fontSize = 10; }
		new FloatInputSpinner yoff;
	}

	[hexpand hfill] new VBox {
		new Label { text = "z offset"; fontSize = 10; }
		new FloatInputSpinner zoff;
	}

	zoom = prop(zoom.value);
	x = prop(xoff.value);
	y = prop(yoff.value);
	z = prop(zoff.value);
}