Admin: 1 версия

2010-06-01T04:57:25Z

1 версия

в 17:44, 31 мая 2010

2010-05-31T17:44:27Z

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== Adding action listener to popup menuitem ==



<source lang="java">
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JMenuItem;
import javax.swing.JPopupMenu;
// Define ActionListener
class PopupActionListener implements ActionListener {
public void actionPerformed(ActionEvent actionEvent) {
System.out.println("Selected: " + actionEvent.getActionCommand());
}
}
public class JPopupMenuItemActionListener {
public static void main(final String args[]) {
JFrame frame = new JFrame("PopupSample Example");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
// Create popup menu, attach popup menu listener
JPopupMenu popupMenu = new JPopupMenu("Title");
ActionListener actionListener = new PopupActionListener();
// Cut
JMenuItem cutMenuItem = new JMenuItem("Cut");
popupMenu.add(cutMenuItem);
// Copy
JMenuItem copyMenuItem = new JMenuItem("Copy");
copyMenuItem.addActionListener(actionListener);
popupMenu.add(copyMenuItem);
// Paste
JMenuItem pasteMenuItem = new JMenuItem("Paste");
pasteMenuItem.addActionListener(actionListener);
pasteMenuItem.setEnabled(false);
popupMenu.add(pasteMenuItem);
// Separator
popupMenu.addSeparator();
// Find
JMenuItem findMenuItem = new JMenuItem("Find");
findMenuItem.addActionListener(actionListener);
popupMenu.add(findMenuItem);
JButton label = new JButton();
frame.add(label);
label.setComponentPopupMenu(popupMenu);
frame.setSize(350, 250);
frame.setVisible(true);
}
}</source>



== Creating a Popup Menu ==



<source lang="java">
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import javax.swing.JButton;
import javax.swing.JMenuItem;
import javax.swing.JPopupMenu;
public class Main {
public static void main(String[] argv) throws Exception {
final JPopupMenu menu = new JPopupMenu();
JMenuItem item = new JMenuItem("Item Label");
// item.addActionListener(actionListener);
menu.add(item);
JButton component = new JButton("button");
component.addMouseListener(new MouseAdapter() {
public void mousePressed(MouseEvent evt) {
if (evt.isPopupTrigger()) {
menu.show(evt.getComponent(), evt.getX(), evt.getY());
}
}
public void mouseReleased(MouseEvent evt) {
if (evt.isPopupTrigger()) {
menu.show(evt.getComponent(), evt.getX(), evt.getY());
}
}
});
}
}</source>



== Creating a Popup Menu with Nested Menus ==



<source lang="java">
import javax.swing.JMenu;
import javax.swing.JPopupMenu;
public class Main {
public static void main(String[] argv) throws Exception {
final JPopupMenu popupMenu = new JPopupMenu();
JMenu submenu = new JMenu("SubMenu1");
submenu.add("asdf");
submenu.add("asdf");
// Add submenu to popup menu
popupMenu.add(submenu);
}
}</source>



== Customizing JPopupMenu Look and Feel ==

Property StringObject TypePopupMenu.actionMapActionMapPopupMenu.backgroundColorPopupMenu.borderBorderPopupMenu.consumeEventOnCloseBooleanPopupMenu.fontFontPopupMenu.foregroundColorPopupMenu.popupSoundStringPopupMenu.selectedWindowInputMapBindingsObject[ ]PopupMenu.selectedWindowInputMapBindings.RightToLeftObject[ ]PopupMenuSeparatorUIStringPopupMenuUIString

== Force the popup menu of a JMenu to be heavyweight: ==



<source lang="java">
import javax.swing.JMenu;
import javax.swing.JMenuItem;
public class Main {
public static void main(String[] argv) throws Exception {
JMenu menu = new JMenu("Menu Label");
menu.add(new JMenuItem("Item Label"));
boolean lwPopup = menu.getPopupMenu().isLightWeightPopupEnabled(); // true
menu.getPopupMenu().setLightWeightPopupEnabled(false);
}
}</source>



== Forcing a Popup Menu to Be a Heavyweight Component ==



<source lang="java">
import javax.swing.JPopupMenu;
public class Main {
public static void main(String[] argv) throws Exception {
JPopupMenu popupMenu = new JPopupMenu();
boolean lwPopup = popupMenu.isLightWeightPopupEnabled(); // true
popupMenu.setLightWeightPopupEnabled(false);
}
}</source>



== JPopupMenu: the container for pop-up menu components ==

Adding Menu Items to a JPopupMenu



<source lang="java">
public JMenuItem add(JMenuItem menuItem);
public JMenuItem add(String label);
public JMenuItem add(Action action);
public void addSeparator();</source>



== To display JPopupMenu on an AWT component ==

If you need to enable the display of a Panel (an AWT component), you can configure it at the individual
JPopupMenu level or for your entire applet or application.
At the individual pop-up level, just set the lightWeightPopupEnabled property to false.
The setInheritsPopupMenu() method accepts a boolean argument.
When true, and no component pop-up menu has been directly set for the component, the parent container will be explored for a pop-up.
At the system level, this is done as follows:



<source lang="java">
// From now on, all JPopupMenus will be heavyweight
JPopupMenu.setDefaultLightWeightPopupEnabled(false);</source>



== Using PopupMenuListener ==



<source lang="java">
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JMenuItem;
import javax.swing.JPopupMenu;
import javax.swing.event.PopupMenuEvent;
import javax.swing.event.PopupMenuListener;
// Define PopupMenuListener
class MyPopupMenuListener implements PopupMenuListener {
public void popupMenuCanceled(PopupMenuEvent popupMenuEvent) {
System.out.println("Canceled");
}
public void popupMenuWillBecomeInvisible(PopupMenuEvent popupMenuEvent) {
System.out.println("Becoming Invisible");
}
public void popupMenuWillBecomeVisible(PopupMenuEvent popupMenuEvent) {
System.out.println("Becoming Visible");
}
}
public class PopupMenuListenerDemo {
public static void main(final String args[]) {
JFrame frame = new JFrame("PopupSample Example");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
// Create popup menu, attach popup menu listener
JPopupMenu popupMenu = new JPopupMenu("Title");
PopupMenuListener popupMenuListener = new MyPopupMenuListener();
popupMenu.addPopupMenuListener(popupMenuListener);
// Cut
JMenuItem cutMenuItem = new JMenuItem("Cut");
popupMenu.add(cutMenuItem);
// Copy
JMenuItem copyMenuItem = new JMenuItem("Copy");
popupMenu.add(copyMenuItem);
// Paste
JMenuItem pasteMenuItem = new JMenuItem("Paste");
pasteMenuItem.setEnabled(false);
popupMenu.add(pasteMenuItem);
// Separator
popupMenu.addSeparator();
// Find
JMenuItem findMenuItem = new JMenuItem("Find");
popupMenu.add(findMenuItem);
JButton label = new JButton();
frame.add(label);
label.setComponentPopupMenu(popupMenu);
frame.setSize(350, 250);
frame.setVisible(true);
}
}</source>

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Admin: 1 версия

в 17:44, 31 мая 2010