Custom JButton for JPopupMenu

> This custom button must have the look and feel of a

> typical menu item. Basically it should have a typical

> features of a checkboxmenuitem where I have an

> check.jpg for check and uncheck of the button.

So why don't you use a JCheckBoxMenuItem? And customize that?

the12huntersa at 2007-7-9 6:12:49 >

No actually Scollable PopupMenu does not work with JCheckBoxMenuItems as its got some flickering issues. So I am putting JButtons on a panel which is put on a JScrollapane on a pop up menu.

Thats why the use of JButtons. But they dont look like simple menu items and hence I need your help in customizing the button close to a JCheckBoxMenuItem

hemanthjavaa at 2007-7-9 6:12:49 >

Thanks a lot. Here are my 2 java files and right below is the probelm I am facing when USing JMenuItems. Thats the reason why i switched over to JButtons.

JframePopupMenu.java

import java.awt.FlowLayout;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import java.awt.event.KeyEvent;

import javax.swing.JButton;

import javax.swing.JCheckBoxMenuItem;

import javax.swing.JFrame;

import javax.swing.JLabel;

import javax.swing.JMenuItem;

import javax.swing.JPanel;

import javax.swing.JScrollPane;

import javax.swing.JTextArea;

import javax.swing.JTextField;

import javax.swing.SwingUtilities;

public class JFramePopupMenu extends JFrame {

private static final long serialVersionUID = 1;

private JPanel jContentPane = null;

private JButton jbnPopup = null;

private JTextField jtfNumOfMenus = null;

private JLabel lblNumElem = null;

JTextArea output;

JScrollPane scrollPane;

String newline = "\n";

ScrollablePopupMenu scrollablePopupMenu = new ScrollablePopupMenu(JFramePopupMenu.this.getGraphicsConfiguration());

private JButton getBtnPopup() {

if (jbnPopup == null) {

jbnPopup = new JButton();

jbnPopup.setText("View Popup");

jbnPopup.addActionListener(new ActionListener() {

public void actionPerformed(ActionEvent e) {

int n = Integer.parseInt(getTxtNumElem().getText());

JCheckBoxMenuItem cbMenuItem = new JCheckBoxMenuItem("A check box menu item");

cbMenuItem.addActionListener(new ActionListener(){

public void actionPerformed(ActionEvent e) {

System.out.println( e );

scrollablePopupMenu.hidemenu();

}

});

cbMenuItem.setMnemonic(KeyEvent.VK_C);

scrollablePopupMenu.add(cbMenuItem);

for (int i=0;i<n;i++){

JMenuItem xx = new JMenuItem(" JMenuItem " + (i+1));

xx.addActionListener(new ActionListener(){

public void actionPerformed(ActionEvent e) {

System.out.println( e );

scrollablePopupMenu.hidemenu();

}

});

//scrollablePopupMenu.add(new JButton(" JMenuItem " + (i+1)));

scrollablePopupMenu.add(xx);

}

scrollablePopupMenu.show(jbnPopup, jbnPopup.getWidth()*3, 0);

}

});

}

return jbnPopup;

}

private JTextField getTxtNumElem() {

if (jtfNumOfMenus == null) {

jtfNumOfMenus = new JTextField();

jtfNumOfMenus.setColumns(3);

jtfNumOfMenus.setText("60");

}

return jtfNumOfMenus;

}

public static void main(String[] args) {

SwingUtilities.invokeLater(new Runnable() {

public void run() {

JFramePopupMenu thisClass = new JFramePopupMenu();

thisClass.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

thisClass.setVisible(true);

}

});

}

public JFramePopupMenu() {

super();

initialize();

}

private void initialize() {

this.setSize(274, 109);

this.setContentPane(getJContentPane());

this.setTitle("Scrollable JPopupMenu");

}

private JPanel getJContentPane() {

if (jContentPane == null) {

lblNumElem = new JLabel();

//lblNumElem.setText("N鷐ero de elementos del Men?);

FlowLayout flowLayout = new FlowLayout();

flowLayout.setHgap(8);

flowLayout.setVgap(8);

jContentPane = new JPanel();

jContentPane.setLayout(flowLayout);

jContentPane.add(getBtnPopup(), null);

jContentPane.add(lblNumElem, null);

jContentPane.add(getTxtNumElem(), null);

}

return jContentPane;

}

}

ScrollablePopupMenu.java

import java.awt.Component;

import java.awt.Dimension;

import java.awt.GraphicsConfiguration;

import java.awt.GridLayout;

import javax.swing.JFrame;

import javax.swing.JMenuItem;

import javax.swing.JPanel;

import javax.swing.JPopupMenu;

import javax.swing.JScrollPane;

import javax.swing.JSeparator;

public class ScrollablePopupMenu extends JPopupMenu {

private static final long serialVersionUID = 1;

private JPanel panelMenus = null;

private JScrollPane scroll = null;

public ScrollablePopupMenu(GraphicsConfiguration gc) {

super();

scroll = new JScrollPane();

panelMenus = new JPanel();

panelMenus.setLayout(new GridLayout(0,1));

scroll.setViewportView(panelMenus);

scroll.setBorder(null);

scroll.setMaximumSize(new Dimension(scroll.getMaximumSize().width,

this.getToolkit().getScreenSize().height -

this.getToolkit().getScreenInsets(gc).top -

this.getToolkit().getScreenInsets(gc).bottom - 4));

super.add(scroll);

}

public void show(Component invoker, int x, int y) {

this.pack();

panelMenus.validate();

int maxsize = scroll.getMaximumSize().height;

int realsize = panelMenus.getPreferredSize().height;

int sizescroll = 0;

if (maxsize >< realsize) {

sizescroll = scroll.getVerticalScrollBar().getPreferredSize().width;

}

scroll.setPreferredSize(new Dimension(

scroll.getPreferredSize().width + sizescroll,

scroll.getPreferredSize().height));

this.setLocation( x, y);

this.setVisible(true);

}

public void hidemenu(){

if(this.isVisible()){

this.setVisible(false);

}

}

public JMenuItem add(JMenuItem menuItem) {

panelMenus.add(menuItem);

return menuItem;

}

public void addSeparator() {

panelMenus.add(new JSeparator());

}

}

Problem 1: Not able to Scroll down when frame is Large

My application is a large frame and when I invoke the JPopupMenu on it I am not able to scroll.

In the example application also I found the same problem when I maximize the frame. I am able to see the JPopupMenu but not able to scroll on it.

hemanthjavaa at 2007-7-9 6:12:49 >