시소당

SplitPaneDemo 예제1

import  java.awt.*;
import  java.awt.event.*;
import  javax.swing.*;
import  javax.swing.event.*;
import  java.util.*;

//SplitPaneDemo  itself  is  not  a  visible  component.
public  class  SplitPaneDemo  extends  JPanel
                                                    implements  ListSelectionListener  {
        private  JLabel  picture;
        private  JList  list;
        private  JSplitPane  splitPane;
        private  String[]  imageNames  =  {  "Bird",  "Cat",  "Dog",  "Rabbit",  "Pig",  "dukeWaveRed",
                "kathyCosmo",  "lainesTongue",  "left",  "middle",  "right",  "stickerface"};
        public  SplitPaneDemo()  {

                //Create  the  list  of  images  and  put  it  in  a  scroll  pane.
                
                list  =  new  JList(imageNames);
                list.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
                list.setSelectedIndex(0);
                list.addListSelectionListener(this);
                
              
                JScrollPane  listScrollPane  =  new  JScrollPane(list);
                picture  =  new  JLabel();
                picture.setFont(picture.getFont().deriveFont(Font.ITALIC));
                picture.setHorizontalAlignment(JLabel.CENTER);
                
                JScrollPane  pictureScrollPane  =  new  JScrollPane(picture);

                //Create  a  split  pane  with  the  two  scroll  panes  in  it.
                splitPane  =  new  JSplitPane(JSplitPane.HORIZONTAL_SPLIT,
                                                                      listScrollPane,  pictureScrollPane);
                splitPane.setOneTouchExpandable(true);
                splitPane.setDividerLocation(150);

                //Provide  minimum  sizes  for  the  two  components  in  the  split  pane.
                Dimension  minimumSize  =  new  Dimension(100,  50);
                listScrollPane.setMinimumSize(minimumSize);
                pictureScrollPane.setMinimumSize(minimumSize);

                //Provide  a  preferred  size  for  the  split  pane.
                splitPane.setPreferredSize(new  Dimension(400,  200));
                updateLabel(imageNames[list.getSelectedIndex()]);
        }
        
        //Listens  to  the  list
        public  void  valueChanged(ListSelectionEvent  e)  {
                JList  list  =  (JList)e.getSource();
                updateLabel(imageNames[list.getSelectedIndex()]);
        }
        
        //Renders  the  selected  image
        protected  void  updateLabel  (String  name)  {
                ImageIcon  icon  =  createImageIcon("images/"  +  name  +  ".gif");
                picture.setIcon(icon);
                if    (icon  !=  null)  {
                        picture.setText(null);
                }  else  {
                        picture.setText("Image  not  found");
                }
        }

        //Used  by  SplitPaneDemo2
        public  JList  getImageList()  {
                return  list;
        }

        public  JSplitPane  getSplitPane()  {
                return  splitPane;
        }

      
        /**  Returns  an  ImageIcon,  or  null  if  the  path  was  invalid.  */
        protected  static  ImageIcon  createImageIcon(String  path)  {
              java.net.URL  imgURL  =  SplitPaneDemo.class.getResource(path);
                if  (imgURL  !=  null)  {
                        return  new  ImageIcon(imgURL);
                }  else  {
                        System.err.println("Couldn't  find  file:  "  +  path);
                        return  null;
                }
        }

        /**
          *  Create  the  GUI  and  show  it.    For  thread  safety,
          *  this  method  should  be  invoked  from  the
          *  event-dispatching  thread.
          */
        private  static  void  createAndShowGUI()  {

                //Create  and  set  up  the  window.
                JFrame  frame  =  new  JFrame("SplitPaneDemo");
                frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                SplitPaneDemo  splitPaneDemo  =  new  SplitPaneDemo();
                frame.getContentPane().add(splitPaneDemo.getSplitPane());

                //Display  the  window.
                frame.pack();
                frame.setVisible(true);
        }

        public  static  void  main(String[]  args)  {
                //Schedule  a  job  for  the  event-dispatching  thread:
                //creating  and  showing  this  application's  GUI.
                javax.swing.SwingUtilities.invokeLater(new  Runnable()  {
                        public  void  run()  {
                                createAndShowGUI();
                        }
                });
        }

            
}