package com.laozhao.msas.util;

import java.awt.Toolkit;
import java.util.regex.Pattern;

import javax.swing.JFrame;
import javax.swing.JTextField;
import javax.swing.text.AttributeSet;
import javax.swing.text.BadLocationException;
import javax.swing.text.PlainDocument;

/**
 * 
 * 数字输入框 number(precision,scale) precision:1~38 scale:0~127
 * 
 * @author LaoZhao
 * 
 */
public class NumberFile extends JTextField {

	/**
	 * 
	 */
	private static final long serialVersionUID = 7766646453110003951L;
	private int precision = 8;
	private int scale = 0;
	private final Pattern intp = Pattern.compile("\\d+");
	private Pattern dicp = Pattern.compile("\\d{1," + (precision - scale)
			+ "}[.]{1}\\d{0," + scale + "}");

	public int getPrecision() {
		return precision;
	}

	public int getScale() {
		return scale;
	}

	public NumberFile() {
		super();
		setDocument(new NumberDocument());
	}

	public NumberFile(int precision, int scale) {
		super();
		setScale(precision, scale);
		setDocument(new NumberDocument());
	}

	public void setScale(int precision, int scale) {
		this.precision = precision;
		this.scale = scale;
		if (precision < 1 || precision > 38) {
			throw new java.lang.IllegalArgumentException(
					"precision must letter than 38 and bigger than 1");
		} else if (scale < -1 || scale > 127) {
			throw new java.lang.IllegalArgumentException(
					"scale must letter than 127 and bigger than -1");
		} else if (precision <= scale) {
			throw new java.lang.IllegalArgumentException(
					"precision must bigger than scale");
		} else {
			dicp = Pattern.compile("\\d{1," + (precision - scale)
					+ "}[.]{1}\\d{0," + scale + "}");
		}
	}

	public Integer getIntValue() {
		return getDoubleValue().intValue();
	}

	public Double getDoubleValue() {
		return Double.parseDouble(getText());
	}

	class NumberDocument extends PlainDocument {
		/**
		 * 
		 */
		private static final long serialVersionUID = 618631385104970883L;

		public NumberDocument() {
			super();
		}

		public void insertString(int offs, String str, AttributeSet a)
				throws BadLocationException {
			try {
				System.out.println(str);
				if (offs < precision - scale) {
					if (!intp.matcher(getText(0, getLength()) + str).matches()) {
						return;
					}
				} else {
					if (!dicp.matcher(getText(0, getLength()) + str).matches()) {
						return;
					}
				}
				super.insertString(offs, str, a);
			} catch (Exception e) {
				Toolkit.getDefaultToolkit().beep();
			}
		}
	}

	public static void main(String[] args) {
		JFrame frame = new JFrame();
		NumberFile nun = new NumberFile(8, 3);
		frame.add(nun);
		nun.setScale(5, 2);
		frame.setVisible(true);
		frame.pack();
	}

}