[JAVA100 example]022, split a panel

Import java.awt.*;


import java.awt.event.*;


import javax.swing.*;


import javax.swing.event.*;


import java.util.*;





/**


* <p>title: Split panel </p>


* <p>description: Demo split panel into left and right parts </p>


* <p>copyright:copyright (c) 2003</p>


* <p>filename:splitpanedemo.java </p>


* @version 1.0


*/


public class Splitpanedemo implements Listselectionlistener {


private string[] imagenames={"Bird.gif", "Cat.gif", "Dog.gif", "Pig.gif"};


private JLabel picture;


private JList list;


private JSplitPane Splitpane;


/**


*<br> Method Description: The constructor, which defines all the artifacts to use


*<br> input Parameters:


*<br> return type:


*/


public Splitpanedemo () {


　　　


//Create a list of image names, set as a single option


list = new JList (imagenames);


List.setselectionmode (listselectionmodel.single_selection);


list.setselectedindex (0);


List.addlistselectionlistener (this);


JScrollPane Listscrollpane = new JScrollPane (list);





//Get the default picture


ImageIcon firstimage = Createimageicon ("images/" +


(String) imagenames[0]);


if (firstimage!= null) {


picture = new JLabel (firstimage);


picture.setpreferredsize (New Dimension (firstimage.geticonwidth),


firstimage.geticonheight ());


} else {


picture = new JLabel ((String) imagenames[0]);


　　　　}


JScrollPane Picturescrollpane = new JScrollPane (picture);





//Create a horizontal split panel that defines the names of two panels.


Splitpane = new JSplitPane (jsplitpane.horizontal_split,true,


Listscrollpane, Picturescrollpane);


splitpane.setonetouchexpandable (TRUE);


splitpane.setdividerlocation (150);





//define the minimum size of the panel


Dimension minimumsize = new Dimension (100, 50);


listscrollpane.setminimumsize (minimumsize);


picturescrollpane.setminimumsize (minimumsize);





//define Initial size


splitpane.setpreferredsize (New Dimension (400, 200));


　　}


/**


*<br> Method Description: Get this split panel


*<br> input Parameters:


*<br> return Type: JSplitPane object


*/


public JSplitPane Getsplitpane () {


return splitpane;


　　}


/**


*<br> Method Description: List Listener event handling


*<br> Input parameters: listselectionevent E list select event


*<br> return type:


*/


public void valuechanged (Listselectionevent e) {


if (e.getvalueisadjusting ())


return;





JList thelist = (JList) e.getsource ();


if (Thelist.isselectionempty ()) {


Picture.seticon (NULL);


picture.settext (NULL);


} else {


int index = Thelist.getselectedindex ();


ImageIcon newimage = Createimageicon ("images/" +


(String) imagenames[index]);


Picture.seticon (newimage);


if (newimage!= null) {


picture.settext (NULL);


picture.setpreferredsize (New Dimension (newimage.geticonwidth),


newimage.geticonheight ());


else {


Picture.settext ("Image not Found:"


+ (String) imagenames[index]);


　　　　　　}


picture.revalidate ();


　　　　}


　　}


/**


*<br> Method Description: Get the drawing object based on the path


*<br> input parameter: String path picture Path


*<br> return type: ImageIcon Picture Object


*/


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;


　　　　}


　　}


/**


*<br> Method Description: Main method


*<br> input Parameters:


*<br> return type:


*/


public static void Main (string[] args) {


jframe.setdefaultlookandfeeldecorated (TRUE);





//define form


JFrame frame = new JFrame ("Splitpanedemo");


frame.setdefaultcloseoperation (jframe.exit_on_close);


Splitpanedemo Splitpanedemo = new Splitpanedemo ();


Frame.getcontentpane (). Add (Splitpanedemo.getsplitpane ());





//Display form


Frame.pack ();


frame.setvisible (TRUE);


　　}


}