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
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
|
/*** START MAIN.H ***/
/* http://www.geocities.com/jeff_louie/x11/helloworld.htm* */
/*
* main.h
* TestX
*
* Created by Jeff Louie on Tue Feb 03 2004.
* Copyright (c) 2004 __MyCompanyName__. All rights reserved.
*
*/
#ifndef MAIN_H
# define MAIN_H 1
# include <iostream>
# include <stdlib.h>
/* include the X library headers */
# include <X11/Xlib.h>
# include <X11/Xos.h>
# include <X11/Xutil.h>
class Main
{
public:
// constructor
Main(int argc, char* const argv[]);
// virtual ~Main();
private:
/* here are our X variables */
Display* dis;
int screen;
Window win;
GC gc;
/* here are our X routines declared! */
void init_x();
void close_x();
void redraw();
int delay(int i);
};
#endif
/*** END MAIN.H ***/
/*** START MAIN.CPP ***/
// modified from Brian Hammond's Howdy program at
// http://www.insanityengine.com/doc/x11/xintro.html
// jeff louie 02.05.2004
int main(int argc, char* const argv[])
{
Main m(argc, argv);
return 0;
}
// Main::~Main() {;};
Main::Main(int argc, char* const argv[])
{
XEvent event; // XEvent declaration
KeySym key; // KeyPress Events
char text[255]; // char buffer for KeyPress Events
init_x();
// event loop
while (1) {
// get the next event and stuff it into our event variable.
// Note: only events we set the mask for are detected!
XNextEvent(dis, &event);
switch (event.type) {
int x;
int y;
case Expose:
if (event.xexpose.count == 0) {
redraw();
}
break;
case KeyPress:
if (XLookupString(&event.xkey, text, 255, &key, 0) == 1) {
// use the XLookupString routine to convert the invent
// KeyPress data into regular text. Weird but necessary...
if ((text[0] == 'q') || (text[0] == 'Q')) {
close_x();
} else {
// echo key press
printf("You pressed the %c key!\n", text[0]);
}
}
break;
case ButtonPress:
// get cursor position
x = event.xbutton.x;
y = event.xbutton.y;
strcpy(text, "X is FUN!");
XSetForeground(dis, gc, rand() % event.xbutton.x % 255);
// draw text at cursor
XDrawString(dis, win, gc, x, y, text, strlen(text));
break;
default:
printf("Unhandled event.\n");
}
}
}
void Main::init_x()
{
unsigned long black, white;
dis = XOpenDisplay(NULL);
screen = DefaultScreen(dis);
black = BlackPixel(dis, screen), white = WhitePixel(dis, screen);
win = XCreateSimpleWindow(dis, DefaultRootWindow(dis), 0, 0, 300, 300, 5,
black, white);
XSetStandardProperties(dis, win, "Hello World", "Hi", None, NULL, 0, NULL);
XSelectInput(dis, win, ExposureMask | ButtonPressMask | KeyPressMask);
// get Graphics Context
gc = XCreateGC(dis, win, 0, 0);
XSetBackground(dis, gc, white);
XSetForeground(dis, gc, black);
XClearWindow(dis, win);
XMapRaised(dis, win);
};
void Main::close_x()
{
XFreeGC(dis, gc);
XDestroyWindow(dis, win);
XCloseDisplay(dis);
exit(1);
};
void Main::redraw()
{
XClearWindow(dis, win);
};
|
