[JAVA100 Example]020, toolbar

Import Javax.swing.JToolBar;


import Javax.swing.JButton;


import Javax.swing.ImageIcon;





import Javax.swing.JFrame;


import Javax.swing.JTextArea;


import Javax.swing.JScrollPane;


import Javax.swing.JPanel;





import Java.net.URL;





import java.awt.*;


import java.awt.event.*;


/**


* <p>title: Tool bar Demo </p>


* <p>description: Provides a toolbar, including "Open", "save", "Search" tool buttons </p>


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


* <p>Filename:ToolBarDemo.java</p>


* @version 1.0


*/


public class Toolbardemo extends JPanel


implements ActionListener {


protected JTextArea TextArea;


protected String newline = "\ n";


Static final private String open = "open";


static final private String save = "Save";


static final private String search = "search";


/**


*<br> Method Description: Constructor


*<br> input Parameters:


*<br> return type:


*/


public Toolbardemo () {


Super (New BorderLayout ());





//Create toolbar


JToolBar ToolBar = new JToolBar ();


addbuttons (ToolBar);





//Create a text field to output some information


TextArea = new JTextArea (15, 30);


textarea.seteditable (FALSE);


JScrollPane ScrollPane = new JScrollPane (TextArea);





//Placement member


setpreferredsize (New Dimension (450, 110));


Add (ToolBar, Borderlayout.page_start);


Add (ScrollPane, borderlayout.center);


　　}


/**


*<br> Method Description: Building the toolbar


*<br> Input Parameters: JToolBar ToolBar tool bar


*<br> return type:


*/


protected void AddButtons (JToolBar toolBar) {


JButton button = null;





//First button, "open"


button = Makenavigationbutton ("Open16", OPEN,


"Open a file!" ",


"Open");


toolbar.add (button);





//second button, "Save"


button = Makenavigationbutton ("Save16", SAVE,


"Save the current file!" ",


"Save");


toolbar.add (button);





//Third button, "Search"


button = Makenavigationbutton ("Search16", SEARCH,


"Search the characters in the file!" ",


"Search");


toolbar.add (button);


　　}


/**


*<br> Method Description: Constructs a button on a toolbar


*<br> input Parameters:


*<br> return type:


*/


protected JButton Makenavigationbutton (String imagename,


String Actioncommand,


String ToolTipText,


String alttext) {


//Search Pictures


String imglocation = "images/"


+ imagename


+ ". gif";


URL ImageURL = ToolBarDemo.class.getResource (imglocation);





//Initialization Tool button


JButton button = new JButton ();


//Set button command


Button.setactioncommand (Actioncommand);


//Set hint information


Button.settooltiptext (ToolTipText);


Button.addactionlistener (this);


　　　


if (ImageURL!= null) {//Find image


Button.seticon (New ImageIcon (ImageURL));


} else {//no image


Button.settext (AltText);


System.err.println ("Resource not Found:"


+ imglocation);


　　　　}





return button;


　　}


/**


*<br> Method Description: Event monitoring


*<br> input Parameters:


*<br> return type:


*/


public void actionperformed (ActionEvent e) {


String cmd = E.getactioncommand ();


String description = null;





if (open.equals (cmd)) {//Click on the first button


Description = "Open a file operation!" ";


} else if (save.equals (cmd)) {//Click on the second button


Description = "Save file operation";


} else if (search.equals (cmd)) {//Click on the third button


Description = "search character operation";


　　　　}





Displayresult ("If here is the real program, you will enter:"


+ description);


　　}





protected void Displayresult (String actiondescription) {


textarea.append (actiondescription + newline);


　　}





public static void Main (string[] args) {


jframe.setdefaultlookandfeeldecorated (TRUE);





//define form


JFrame frame = new JFrame ("Toolbardemo");


frame.setdefaultcloseoperation (jframe.exit_on_close);





//Definition panel


Toolbardemo Newcontentpane = new Toolbardemo ();


Newcontentpane.setopaque (TRUE);


Frame.setcontentpane (Newcontentpane);





//Display form


Frame.pack ();


frame.setvisible (TRUE);


　　}


}