module.exports = new Class
({
	Extends: Htk.Field
	,Tag: 'htk-spin'

	,render: function ()
	{
		var input = this.createRoot ('input');
		this.node.type = 'number';
		input.addEventListener ('change', this._onChange.bind (this));

		this.unit = null;
		this.digits = 0;
	}

	,_onChange: function ()
	{
		var newValue = (this.node.value == '') ? null : parseFloat (this.node.value);
		this.node.value = newValue;
		this.valueChanged (newValue);
	}

	,putValue: function (value)
	{
		var text;
		
		if (value != null)
		{
			text = (new Number (value)).toFixed (this.digits);
		
			if (this.unit != null)
				text += ' ' + this.unit;
		}
		else
			text = '';
	
		this.node.value = text;
	}

	,setEditable: function (editable)
	{
		this.node.readOnly = !editable;
	}
});