/* * Copyright (c) 2000 David Flanagan.  All rights reserved. * This code is from the book Java Examples in a Nutshell, 2nd Edition. * It is provided AS-IS, WITHOUT ANY WARRANTY either expressed or implied. * You may study, use, and modify it for any non-commercial purpose. * You may distribute it non-commercially as long as you retain this notice. * For a commercial use license, or to purchase the book (recommended), * visit http://www.davidflanagan.com/javaexamples2. */package com.davidflanagan.examples.applet;import java.applet.*;import java.awt.*;import java.util.*;/** An applet that gives details about Java 1.0 events */public class EventTester extends Applet {    // Handle mouse events    public boolean mouseDown(Event e, int x, int y)  {	showLine(mods(e.modifiers) +  "Mouse Down: [" + x + "," + y + "]");	return true;    }    public boolean mouseUp(Event e, int x, int y)  {	showLine(mods(e.modifiers) + "Mouse Up: [" + x + "," + y + "]");	return true;    }    public boolean mouseDrag(Event e, int x, int y)  {	showLine(mods(e.modifiers) + "Mouse Drag: [" + x + "," + y + "]");	return true;    }    public boolean mouseMove(Event e, int x, int y) {	showLine(mods(e.modifiers) + "Mouse Move: [" + x + "," + y + "]");	return true;    }    public boolean mouseEnter(Event e, int x, int y)  {	showLine("Mouse Enter: [" + x + "," + y + "]"); return true;    }    public boolean mouseExit(Event e, int x, int y)  {	showLine("Mouse Exit: [" + x + "," + y + "]"); return true;    }        // Handle focus events    public boolean gotFocus(Event e, Object what)  {	showLine("Got Focus"); return true;    }    public boolean lostFocus(Event e, Object what)  {	showLine("Lost Focus"); return true;    }        // Handle key down and key up events    // This gets more confusing because there are two types of key events    public boolean keyDown(Event e, int key)  {	int flags = e.modifiers;	if (e.id == Event.KEY_PRESS)                 // a regular key	    showLine("Key Down: " + mods(flags) + key_name(e));	else if (e.id == Event.KEY_ACTION)           // a function key	    showLine("Function Key Down: " + mods(flags) +		     function_key_name(key));	return true;    }    public boolean keyUp(Event e, int key)  {	int flags = e.modifiers;	if (e.id == Event.KEY_RELEASE)               // a regular key	    showLine("Key Up: " + mods(flags) + key_name(e));	else if (e.id == Event.KEY_ACTION_RELEASE)   // a function key	    showLine("Function Key Up: " + mods(flags) +		     function_key_name(key));	return true;    }        // The remaining methods help us sort out the various modifiers and keys        // Return the current list of modifier keys    private String mods(int flags) {	String s = "[ ";	if (flags == 0) return "";	if ((flags & Event.SHIFT_MASK) != 0) s += "Shift ";	if ((flags & Event.CTRL_MASK) != 0) s += "Control ";	if ((flags & Event.META_MASK) != 0) s += "Meta ";	if ((flags & Event.ALT_MASK) != 0) s += "Alt ";	s += "] ";	return s;    }        // Return the name of a regular (non-function) key.    private String key_name(Event e) {	char c = (char) e.key;	if (e.controlDown()) {   // If CTRL flag is set, handle control chars.	    if (c < ' ') {		c += '@';		return "^" + c;	    }	}	else {                   // If CTRL flag is not set, then certain ASCII	    switch (c) {         // control characters have special meaning.	    case '\n': return "Return";	    case '\t': return "Tab";	    case '\033': return "Escape";	    case '\010': return "Backspace";	    }	}	// Handle the remaining possibilities.	if (c == '\177') return "Delete";	else if (c == ' ') return "Space";	else return String.valueOf(c);    }        // Return the name of a function key.  Just compare the key to the    // constants defined in the Event class.    private String function_key_name(int key) {	switch(key) {	case Event.HOME: return "Home";     case Event.END: return "End";	case Event.PGUP: return "Page Up";  case Event.PGDN: return"Page Down";	case Event.UP: return "Up";         case Event.DOWN: return "Down";	case Event.LEFT: return "Left";     case Event.RIGHT: return "Right";	case Event.F1: return "F1";         case Event.F2: return "F2";	case Event.F3: return "F3";         case Event.F4: return "F4";	case Event.F5: return "F5";         case Event.F6: return "F6";	case Event.F7: return "F7";         case Event.F8: return "F8";	case Event.F9: return "F9";         case Event.F10: return "F10";	case Event.F11: return "F11";       case Event.F12: return "F12";	}	return "Unknown Function Key";    }        /** A list of lines to display in the window */    protected Vector lines = new Vector();    /** Add a new line to the list of lines, and redisplay */    protected void showLine(String s) {	if (lines.size() == 20) lines.removeElementAt(0);	lines.addElement(s);	repaint();    }    /** This method repaints the text in the window */    public void paint(Graphics g) {	for(int i = 0; i < lines.size(); i++)	    g.drawString((String)lines.elementAt(i), 20, i*16 + 50);    }}