PopupDemo.java Source code

Introduction

Here is the source code for PopupDemo.java

Source

//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));
    }
}