Provided by: libcdk5-dev_5.0.20230201-4_amd64 
NAME
cdk_button - create and manage a curses button widget.
SYNOPSIS
cc [ flag ... ] file ... -lcdk [ library ... ]
#include <cdk.h>
typedef void (*tButtonCallback)(struct SButton *button);
int activateCDKButton (
CDKBUTTON *button,
chtype * actions);
void destroyCDKButton (
CDKBUTTON *button);
void drawCDKButton (
CDKBUTTON *b,
boolean box);
void eraseCDKButton (
CDKBUTTON *button);
boolean getCDKButtonBox (
CDKBUTTON *b);
chtype *getCDKButtonMessage (
CDKBUTTON *b);
int injectCDKButtonbox (
CDKBUTTON *buttonbox,
chtype input);
CDKBUTTON *newCDKButton(
CDKSCREEN *cdkscreen,
int xpos,
int ypos,
const char *message,
tButtonCallback callback,
boolean box,
boolean shadow);
void setCDKButton(
CDKBUTTON *b,
const char *message,
boolean box);
void setCDKButtonBackgroundAttrib (
CDKBUTTON *b,
chtype attribute);
void setCDKButtonBackgroundColor (
CDKBUTTON *b,
const char * color);
void setCDKButtonBox (
CDKBUTTON *button,
boolean box);
void setCDKButtonBoxAttribute (
CDKBUTTON *b,
chtype c);
void setCDKButtonHorizontalChar (
CDKBUTTON *b,
chtype c);
void setCDKButtonLLChar (
CDKBUTTON *b,
chtype c);
void setCDKButtonLRChar (
CDKBUTTON *b,
chtype c);
void setCDKButtonMessage (
CDKBUTTON *b,
const char *message);
void setCDKButtonULChar (
CDKBUTTON *b,
chtype c);
void setCDKButtonURChar (
CDKBUTTON *b,
chtype c);
void setCDKButtonVerticalChar (
CDKBUTTON *b,
chtype c);
void moveCDKButton(
CDKBUTTON *b,
int xpos,
int ypos,
boolean relative,
boolean refresh);
void positionCDKButton (
CDKBUTTON *b);
void waitCDKButton (
CDKBUTTON *button,
char key);
DESCRIPTION
The Cdk button widget displays a message string and executes a callback when the user presses enter or
space. As such, it is only useful on a screen that is being managed by some external screen traversal
engine such as traverseCDKScreen(). The button will be highlighted when the widget has the focus. The
following functions create or manipulate the Cdk button widget.
AVAILABLE FUNCTIONS
activateCDKButton
activates the button widget and lets the user interact with the widget.
• The parameter button is a pointer to a non-NULL button widget.
• If the actions parameter is passed with a non-NULL value, the characters in the array will be
injected into the widget.
To activate the widget interactively pass in a NULL pointer for actions.
If the character entered into this widget is RETURN or TAB then this function will return a value
from 0 to the number of buttons -1, representing the button selected. It will also set the widget
data exitType to vNORMAL.
If the character entered into this widget was ESCAPE then the widget will return a value of -1 and
the widget data exitType will be set to vESCAPE_HIT.
destroyCDKButton
removes the widget from the screen and frees up any memory the object used.
drawCDKButton
draws the button widget on the screen.
If the box parameter is true, the widget is drawn with a box.
eraseCDKButton
removes the widget from the screen. This does NOT destroy the widget.
getCDKButtonBox
returns true if the widget will be drawn with a box around it.
getCDKButtonMessage
returns the contents of the button widget.
injectCDKButton
injects a single character into the widget.
• The parameter button is a pointer to a non-NULL button widget.
• The parameter character is the character to inject into the widget.
The return value and side-effect (setting the widget data exitType) depend upon the injected
character:
RETURN or TAB
this function returns 0, representing the button selected. The widget data exitType is set
to vNORMAL.
ESCAPE the function returns -1. The widget data exitType is set to vESCAPE_HIT.
Otherwise
unless modified by preprocessing, postprocessing or key bindings, the function returns -1.
The widget data exitType is set to vEARLY_EXIT.
moveCDKButton
moves the given widget to the given position.
• The parameters xpos and ypos are the new position of the widget.
The parameter xpos may be an integer or one of the pre-defined values TOP, BOTTOM, and CENTER.
The parameter ypos may be an integer or one of the pre-defined values LEFT, RIGHT, and CENTER.
The parameter relative states whether the xpos/ypos pair is a relative move or an absolute move.
For example, if xpos = 1 and ypos = 2 and relative = TRUE, then the widget would move one row
down and two columns right. If the value of relative was FALSE, then the widget would move to
the position (1,2).
Do not use the values TOP, BOTTOM, LEFT, RIGHT, or CENTER when relative = TRUE. (weird things
may happen).
• The final parameter refresh is a boolean value which states whether the widget will get
refreshed after the move.
newCDKButton
creates a pointer to a buttonbox widget. Parameters:
• The screen parameter is the screen you wish this widget to be placed in.
• xpos controls the placement of the object along the horizontal axis. It may be an integer or
one of the pre-defined values LEFT, RIGHT, and CENTER.
• ypos controls the placement of the object along the vertical axis. It be an integer or one of
the pre-defined values TOP, BOTTOM, and CENTER.
• message is the message to display in the button window, formatted as described in cdk_display.
• callback is an optional pointer to a callback function that will be executed when the user
activates the button by pressing space or enter.
• box is true if the widget should be drawn with a box around it.
• shadow turns the shadow on or off around this widget.
If the widget could not be created then a NULL pointer is returned.
positionCDKButton
allows the user to move the widget around the screen via the cursor/keypad keys. See cdk_position
(3) for key bindings.
setCDKButton
lets the programmer modify certain elements of an existing buttonbox widget.
The parameter names correspond to the same parameter names listed in the newCDKButton function.
setCDKButtonBackgroundAttrib
sets the background attribute of the widget.
The parameter attribute is a curses attribute, e.g., A_BOLD.
setCDKButtonBackgroundColor
sets the background color of the widget.
The parameter color is in the format of the Cdk format strings. (See cdk_display).
setCDKButtonBox
sets true if the widget will be drawn with a box around it.
setCDKButtonBoxAttribute
sets the attribute of the box.
setCDKButtonHorizontalChar
sets the horizontal drawing character for the box to the given character.
setCDKButtonLLChar
sets the lower left hand corner of the widget's box to the given character.
setCDKButtonLRChar
sets the lower right hand corner of the widget's box to the given character.
setCDKButtonMessage
This sets the contents of the label widget.
setCDKButtonULChar
sets the upper left hand corner of the widget's box to the given character.
setCDKButtonURChar
sets the upper right hand corner of the widget's box to the given character.
setCDKButtonVerticalChar
sets the vertical drawing character for the box to the given character.
BUGS
Changing the Box attribute after the widget has been created probably does not work right. None of the
positioning/movement code has been tested.
AUTHOR
Grant Edwards, Aspen Research Corporation
SEE ALSO
cdk(3), cdk_binding(3), cdk_display(3), cdk_position(3), cdk_process(3), cdk_screen(3), cdk_traverse(3)
cdk_button(3)