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1.1 root 1: .TH XTEXT 3X "August 12 1985" "X Version 10"
2: .SH NAME
3: Xtext \- routines to provide simple text output windows
4: .SH SYNOPSIS
5: .nf
6: .B #include <X/Xlib.h>
7: .B #include <X/Xtext.h>
8: .PP
9: .fi
10: .B TextWindow *TextCreate(width, height, x, y, parent, fontname, bwidth,
11: .br
12: .B fgpixel, bgpixel, bordercolor, fastscroll);
13: .br
14: .B int height, width, x, y,
15: .B bwidth, fgpixel, bgpixel, fastscroll;
16: .nf
17: .B Window parent;
18: .B char *fontname;
19: .B Pixmap bordercolor;
20: .PP
21: .B TextDestroy(t);
22: .B TextWindow *t;
23: .PP
24: .B TextClear(t);
25: .B TextWindow *t;
26: .PP
27: .B TextRedisplay(t);
28: .B TextWindow *t;
29: .PP
30: .B int TextEvent(t, e);
31: .B TextWindow *t;
32: .B XEvent *e;
33: .PP
34: .B TextPutString(t, str);
35: .B TextWindow *t;
36: .B char *str;
37: .PP
38: .B TextPutChar(t, ch);
39: .B TextWindow *t;
40: .B char ch;
41: .PP
42: .fi
43: .B TextPrintf(t, format
44: .B [ , arg ] ... )
45: .nf
46: .B TextWindow *t;
47: .B char *format;
48: .SH DESCRIPTION
49: These functions provide a simple interface to text output windows.
50: .PP
51: .I TextCreate
52: creates a window that is
53: .I width
54: characters wide and
55: .I height
56: characters high. It is located with its upper left hand corner located
57: at the point
58: .I x, y
59: in the window
60: .I parent.
61: The foreground (i.e. the characters) is in the color
62: .I fgpixel
63: and the background is the color
64: .I bgpixel.
65: The border is
66: .I bwidth
67: pixels wide and filled with the Pixmap
68: .I bordercolor.
69: If
70: .I fastscroll
71: is nonzero, text containing multiple newlines is displayed with a single
72: jump scroll rather than with a single scroll for each newline.
73: .PP
74: The structure
75: .I TextWindow
76: is defined in
77: \fI/usr/include/X/Xtext.h\fP.
78: The only field that should be of interest to most applications is
79: .I w,
80: the X Window id of the created window. This is quite useful if the
81: application wishes to map the created window.
82: .PP
83: .I TextDestroy
84: destroys the window described by its argument. The window is also
85: destroyed automatically if the process creating it is terminated.
86: .PP
87: .I TextClear
88: clears the window described by its argument.
89: .PP
90: .I TextRedisplay
91: redisplays the window described by its argument.
92: .PP
93: .I TextEvent
94: handles the event passed to it. It returns 0 if it was an event
95: the library knows how to deal with, and 1 if it was an event of an
96: unknown type; the latter should only happen if the application has
97: changed the event mask for the window. Any event that the application
98: receives that has as its
99: .I window
100: the window id of the text window should be passed to
101: .I TextEvent
102: for handling. Scrolling text generates an event per line of events, so the
103: application should check for them frequently.
104: .PP
105: .I TextPutString
106: prints its string in its window. The character '\\n' (newline) is
107: treated specially, and any other character is taken from the font.
108: If the string contains multiple newlines, a single scroll is done for
109: each line unless the
110: .I fastscroll
111: argument was non-zero in the call to
112: .I TextCreate.
113: .PP
114: .I TextPutChar
115: is similar to
116: .I TextPutString
117: but only prints a single character. Again, newline is treated
118: specially.
119: .PP
120: .I TextPrintf
121: is similar to the standard function
122: .I printf
123: except that it prints its result in the specified window. The
124: resulting string is passed to
125: .I TextPutString.
126: See also the
127: .B BUGS
128: section at the end of this page.
129: .SH "SEE ALSO"
130: printf(3S), xterm(1), X(8C)
131: .SH AUTHOR
132: Paul Asente, Stanford University
133: .SH BUGS
134: \fITextPrintf\fP will truncate the output if the resulting string is more than
135: 2048 characters long.
136: .PP
137: Since X operates asynchronously, it is possible to get way ahead of the
138: server. This means that it may be quite a while between when a scroll
139: happens on the screen and when \fIXtext\fP gets around to filling in areas
140: that couldn't be scrolled normally. This should only happen if the
141: application issues a great many output requests very quickly, or if it
142: doesn't get around to receiving the events \fIXtext\fP needs to fill these
143: areas in. Also, some strange TCP bugs are invoked if an application
144: which has gotten far ahead of the X server is stopped (as with a
145: control-Z).
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