Mega Code Archive
Popup Menu Demo
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//From: mg@dsd.camb.inmet.com (Mitch Gart)
import java.awt.BorderLayout;
import java.awt.Button;
import java.awt.Component;
import java.awt.Frame;
import java.awt.Label;
import java.awt.Menu;
import java.awt.MenuBar;
import java.awt.MenuItem;
import java.awt.Panel;
import java.awt.PopupMenu;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.util.Hashtable;
public class PopupDemo extends Frame implements ActionListener, MouseListener {
public static void main(String argv[]) {
new PopupDemo().setVisible(true);
}
public PopupDemo() {
MenuBar mb = new MenuBar();
setMenuBar(mb);
Menu m = new Menu("file");
mb.add(m);
MenuItem item = new MenuItem("file-1");
item.addActionListener(this);
m.add(item);
item = new MenuItem("file-2");
m.add(item);
setSize(100, 100);
setLayout(new BorderLayout());
Label l = new Label("label");
addPopup(l, "label");
add(l, "North");
Panel p = new Panel();
addPopup(p, "Panel");
add(p, "Center");
Button b = new Button("button");
addPopup(b, "button");
add(b, "South");
}
public void actionPerformed(ActionEvent e) {
System.out.println("actionPerformed, event=" + e + ", mod="
+ getMods(e));
System.out.println(" command=" + e.getActionCommand());
System.out.println(" param=" + e.paramString());
System.out.println(" source=" + e.getSource());
}
String getMods(ActionEvent e) {
return getMods(e.getModifiers());
}
String getMods(MouseEvent e) {
return getMods(e.getModifiers());
}
// a convenience routine for printing the Modifier keys
String getMods(int mods) {
String modstr = "";
if ((mods & ActionEvent.SHIFT_MASK) == ActionEvent.SHIFT_MASK)
modstr += (" SHIFT");
if ((mods & ActionEvent.ALT_MASK) == ActionEvent.ALT_MASK)
modstr += (" ALT");
if ((mods & ActionEvent.CTRL_MASK) == ActionEvent.CTRL_MASK)
modstr += (" CTRL");
if ((mods & ActionEvent.META_MASK) == ActionEvent.META_MASK)
modstr += (" META");
return modstr;
}
public void mouseClicked(MouseEvent e) {
mouseAction("mouseClicked", e);
}
public void mouseEntered(MouseEvent e) {
}
public void mouseExited(MouseEvent e) {
}
public void mousePressed(MouseEvent e) {
mouseAction("mousePressed", e);
}
public void mouseReleased(MouseEvent e) {
mouseAction("mouseReleased", e);
}
void mouseAction(String which, MouseEvent e) {
Component c = e.getComponent();
System.out.println(which + "e=" + e + ", mods=" + getMods(e)
+ ", component=" + c);
if (e.isPopupTrigger()) {
System.out.println("isPopup");
PopupMenu pm = getHash(c);
pm.show(c, c.getSize().width / 2, c.getSize().height / 2);
}
}
void addPopup(Component c, String name) {
PopupMenu pm = new PopupMenu();
MenuItem mi = new MenuItem(name + "-1");
mi.addActionListener(this);
pm.add(mi);
mi = new MenuItem(name + "-2");
pm.add(mi);
setHash(c, pm);
c.add(pm);
c.addMouseListener(this);
}
Hashtable popupTable = new Hashtable();
void setHash(Component c, PopupMenu p) {
popupTable.put(c, p);
}
PopupMenu getHash(Component c) {
return (PopupMenu) (popupTable.get(c));
}
}
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