1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
|
/* Listing2906.java */
import java.awt.*;
import java.awt.event.*;
public class Listing2906
extends Frame
implements KeyListener
{
String msg1 = "";
String msg2 = "";
public static void main(String[] args)
{
Listing2906 wnd = new Listing2906();
}
public Listing2906()
{
super("Tastaturereignisse");
addKeyListener(this);
addWindowListener(new WindowClosingAdapter(true));
setBackground(Color.lightGray);
setSize(300,200);
setLocation(200,100);
setVisible(true);
}
public void paint(Graphics g)
{
if (msg1.length() > 0) {
draw3DRect(g,20,50,250,30);
g.setColor(Color.black);
g.drawString(msg1,30,70);
}
if (msg2.length() > 0) {
draw3DRect(g,20,100,250,30);
g.setColor(Color.black);
g.drawString(msg2,30,120);
}
}
void draw3DRect(Graphics g,int x,int y,int width,int height)
{
g.setColor(Color.darkGray);
g.drawLine(x,y,x,y+height);
g.drawLine(x,y,x+width,y);
g.setColor(Color.white);
g.drawLine(x+width,y+height,x,y+height);
g.drawLine(x+width,y+height,x+width,y);
}
public void keyPressed(KeyEvent event)
{
msg1 = "";
System.out.println(
"key pressed: " +
"key char = " + event.getKeyChar() + " " +
"key code = " + event.getKeyCode()
);
if (event.getKeyChar() == KeyEvent.CHAR_UNDEFINED) {
int key = event.getKeyCode();
//Funktionstaste abfragen
if (key == KeyEvent.VK_F1) {
msg1 = "F1";
} else if (key == KeyEvent.VK_F2) {
msg1 = "F2";
} else if (key == KeyEvent.VK_F3) {
msg1 = "F3";
}
//Modifier abfragen
if (msg1.length() > 0) {
if (event.isAltDown()) {
msg1 = "ALT + " + msg1;
}
if (event.isControlDown()) {
msg1 = "STRG + " + msg1;
}
if (event.isShiftDown()) {
msg1 = "UMSCHALT + " + msg1;
}
}
}
repaint();
}
public void keyReleased(KeyEvent event)
{
System.out.println("key released");
msg1 = "";
repaint();
}
public void keyTyped(KeyEvent event)
{
char key = event.getKeyChar();
System.out.println("key typed: " + key);
if (key == KeyEvent.VK_BACK_SPACE) {
if (msg2.length() > 0) {
msg2 = msg2.substring(0,msg2.length() - 1);
}
} else if (key >= KeyEvent.VK_SPACE) {
if (msg2.length() < 40) {
msg2 += event.getKeyChar();
}
}
repaint();
}
}
|
