cdk_display(3)
- NetBSD Manual Pages
cdk_display(3) cdk_display(3)
NAME
Cdk - Curses Development Kit Display Capabilities.
SYNOPSIS
Cdk has a number of pre-defined display types which need explaining.
This manual page will explain all of the display types and how to use
them. The following lists which display types will be outlined in this
manual page.
· How To Use Colors
· How To Use Different Character Attributes
· How To Justify Strings
· How To Use Special Drawing Characters
DESCRIPTION
Cdk has special formatting commands which can be included in any string
which add highlights, justification, or even colors to a basic string.
This manual page outlines and demonstrates how they work.
How To Use Colors
Cdk has the capability to display colors in almost every string type
displayed in a Cdk widget. To turn on colors, the function initCDK-
Color has to be called. When this function is called 64 color pairs
are created. Normally the color pairs are accessed via the
COLOR_PAIR macro. You can still do this, but creating a string with
multiple colors gets terribly difficult. That is why the color com-
mands were created. The color setting are stored directly in the
string and when the widget is created or activated, the string is
converted to take advantage of any color commands in the string. To
turn on a color pair insert </XX> into the string; where XX is a
numeric value from 0 to 64. Color pair 0 is the standard default
color pair for the screen. To turn off a color pair use the format
command <!XX> where XX is a numeric value from 0 to 64. The follow-
ing code segment demonstrates the use of the color commands.
----------------------------------------
#include <cdk.h>
void main()
{
CDKSCREEN *cdkscreen;
CDKLABEL *demo;
WINDOW *screen;
char *mesg[4];
/* Initialize the Cdk screen. */
screen = initscr();
cdkscreen = initCDKScreen (screen);
/* Set the labels up. */
mesg[0] = "</1>This line should have a yellow foreground and a blue background.<!1>";
mesg[1] = "</2>This line should have a white foreground and a blue background.<!2>";
mesg[2] = "</3>This line should have a yellow foreground and a red background.<!3>";
mesg[3] = "<C>This line should be set to whatever the screen default is.";
/* Declare the labels. */
demo = newCDKLabel (cdkscreen, CENTER, CENTER, mesg, 4, TRUE, TRUE);
/* Draw the label */
drawCDKLabel (demo, TRUE);
waitCDKLabel (demo, ' ');
/* Clean up */
destroyCDKLabel (demo);
destroyCDKScreen (cdkscreen);
endCDK();
exit (0);
}
----------------------------------------
This example uses the color pair 5 (which is white on blue) for the
label to the entry widget.
How To Use Different Character Attributes
Cdk also provides attribute commands which allow different character
attributes to be displayed in a Cdk widget. To use a character
attribute the format command is </X> where X is one of several com-
mand characters. To turn a attribute off use the command <!X>. The
following table outlines the command characters and what they mean.
Command_Character Character_Attribute
B Bold
U Underline
K Blink
R Reverse
S Standout
D Dim
N Normal
The following code segment demonstrates the use of character display
attributes.
----------------------------------------
#include <cdk.h>
void main()
{
CDKSCREEN *cdkscreen;
CDKLABEL *demo;
WINDOW *screen;
char *mesg[4];
/* Initialize the Cdk screen. */
screen = initscr();
cdkscreen = initCDKScreen (screen);
/* Set the labels up. */
mesg[0] = "</B/1>This line should have a yellow foreground and a blue background.<!1>";
mesg[1] = "</U/2>This line should have a white foreground and a blue background.<!2>";
mesg[2] = "</K/3>This line should have a yellow foreground and a red background.<!3>";
mesg[3] = "<C>This line should be set to whatever the screen default is.";
/* Declare the labels. */
demo = newCDKLabel (cdkscreen, CENTER, CENTER, mesg, 4, TRUE, TRUE);
/* Draw the label */
drawCDKLabel (demo, TRUE);
waitCDKLabel (demo, ' ');
/* Clean up */
destroyCDKLabel (demo);
destroyCDKScreen (cdkscreen);
endCDK();
exit (0);
}
----------------------------------------
Notice that color commands and format commands can be mixed inside
the same format marker. The above example underlines the label
marker, which also sets color pair number 5.
How To Justify Strings
Justification commands can left justify, right justify, or center a
string of text. To use a justification format in a string the com-
mand <X> is used. The following table lists all of the format com-
mands available.
Justification_Command Action.
<L> Left Justified. Default if not stated.
<C> Centered text.
<R> Right justified.
<I=X> Indent the line X characters.
<B=X> Bullet. X is the bullet string to use.
<F=X> Links in a file where X is the filename.
Currently only works with the viewer
widget.
The following code segment demonstrates how to use the justification
commands in a Cdk widget.
----------------------------------------
#include <cdk.h>
void main()
{
CDKSCREEN *cdkscreen;
CDKLABEL *demo;
WINDOW *screen;
char *mesg[4];
/* Initialize the Cdk screen. */
screen = initscr();
cdkscreen = initCDKScreen (screen);
/* Set the labels up. */
mesg[0] = "<R></B/1>This line should have a yellow foreground and a blue background.<!1>";
mesg[1] = "</U/2>This line should have a white foreground and a blue background.<!2>";
mesg[2] = "<B=+>This is a bullet.";
mesg[3] = "<I=10>This is indented 10 characters.";
mesg[4] = "<C>This line should be set to whatever the screen default is.";
/* Declare the labels. */
demo = newCDKLabel (cdkscreen, CENTER, CENTER, mesg, 5, TRUE, TRUE);
/* Draw the label */
drawCDKLabel (demo, TRUE);
waitCDKLabel (demo, ' ');
/* Clean up */
destroyCDKLabel (demo);
destroyCDKScreen (cdkscreen);
endCDK();
exit (0);
}
----------------------------------------
The bullet format command can take either a single character or a
string. The bullet in the the above example would look like
+ This is a bullet.
but if we were to use the following command instead
<B=***>This is a bullet.
it would look like
*** This is a bullet.
The only restriction that a format command has is that it must be at
the beginning of the string.
How To Use Special Drawing Characters
Cdk has a set of special drawing characters which can be inserted
into any ASCII file. In order to use a special character the format
command <#XXX> is used. The following table lists all of the special
character commands available.
Special_Character Character
<#UL> Upper Left Corner
<#UR> Upper Right Corner
<#LL> Lower Left Corner
<#LR> Lower Right Corner
<#LT> Left Tee
<#RT> Right Tee
<#TT> Top Tee
<#BT> Bottom Tee
<#HL> Horizontal Line
<#VL> Vertical Line
<#PL> Plus Sign
<#PM> Plus/Minus Sign
<#DG> Degree Sign
<#CB> Checker Board
<#DI> Diamond
<#BU> Bullet
The character formats can be repeated using an optional numeric
repeat value. To repeat a character add (XXX) to the end of the
character format. The following example, draws 10 horizontal lines.
<#HL(10)>
The following code segment draws a box within a label window.
----------------------------------------
#include "cdk.h"
void main()
{
/* Declare variables. */
CDKSCREEN *cdkscreen;
CDKLABEL *demo;
WINDOW *cursesWin;
char *mesg[4];
/* Set up CDK */
cursesWin = initscr();
cdkscreen = initCDKScreen (cursesWin);
/* Start CDK Colors */
initCDKColor();
/* Set the labels up. */
mesg[0] = "<C><#UL><#HL(25)><#UR>";
mesg[1] = "<C><#VL></R>This text should be boxed.<!R><#VL>";
mesg[2] = "<C><#LL><#HL(25)><#LR>";
mesg[3] = "<C>While this is not.";
/* Declare the labels. */
demo = newCDKLabel (cdkscreen, CENTER, CENTER, mesg, 4, TRUE, TRUE);
/* Is the label NULL??? */
if (demo == (CDKLABEL *)NULL)
{
/* Clean up the memory. */
destroyCDKScreen (cdkscreen);
/* End curses... */
endCDK();
/* Spit out a message. */
printf ("Oops. Can't seem to create the label. Is the window too small?0);
exit (1);
}
/* Draw the CDK screen. */
refreshCDKScreen (cdkscreen);
waitCDKLabel (demo, ' ');
/* Clean up */
destroyCDKLabel (demo);
destroyCDKScreen (cdkscreen);
delwin (cursesWin);
endCDK();
exit (0);
}
----------------------------------------
Notice that drawn text can also be justified.
SEE ALSO
cdk(3), cdk_binding(3), cdk_screen(3)
NOTES
The header file <cdk.h> automatically includes the header files
<curses.h>, <stdlib.h>, <string.h>, <ctype.h>, <unistd.h>, <dirent.h>,
<time.h>, <errno.h>, <pwd.h>, <grp.h>, <sys/stat.h>, and <sys/types.h>.
The <curses.h> header file includes <stdio.h> and <unctrl.h>.
05 Dec 1995 cdk_display(3)
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