cdk_button (3) - Linux Manuals

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