inputfield.java

来自「一个应用timer的小程序」· Java 代码 · 共 50 行

package net.sujee.util;


import java.awt.Color;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import java.awt.GridLayout;
import javax.swing.JTextField;


public abstract class InputField extends JTextField
{
   Color mColorOkay = Color.blue;
   Color mColorError = Color.red;
   public InputField ()
   {
      super ();
      setForeground(mColorOkay);

      addKeyListener( new KeyAdapter ()
            {
               public void keyReleased (KeyEvent e)
               {

                  String value = getText();
                  if (isValidValue (value) )
                  setForeground(mColorOkay);
                  else

                  setForeground(mColorError);


               }
            });
   }

   public abstract boolean isValidValue (String value);

   public void flagError ()
   {
      setForeground(mColorError);
   }

   public void clearError ()
   {
      setForeground(mColorOkay);
   }

}