DOKK / manpages / debian 12 / libcdk5-dev / positionCDKButton.3.en
cdk_button(3) Library Functions Manual cdk_button(3)

cdk_button - create and manage a curses button widget.

cc [ flag ... ] file ... -lcdk [ library ... ]

#include <cdk.h>

typedef void (*tButtonCallback)(struct SButton *button);

CDKBUTTON *button,
chtype * actions);
CDKBUTTON *button);
CDKBUTTON *b,
boolean box);
CDKBUTTON *button);
CDKBUTTON *b);
CDKBUTTON *b);
CDKBUTTON *buttonbox,
chtype input);
CDKSCREEN *cdkscreen,
int xpos,
int ypos,
const char *message,
tButtonCallback callback,
boolean box,
boolean shadow);
CDKBUTTON *b,
const char *message,
boolean box);
CDKBUTTON *b,
chtype attribute);
CDKBUTTON *b,
const char * color);
CDKBUTTON *button,
boolean box);
CDKBUTTON *b,
chtype c);
CDKBUTTON *b,
chtype c);
CDKBUTTON *b,
chtype c);
CDKBUTTON *b,
chtype c);
CDKBUTTON *b,
const char *message);
CDKBUTTON *b,
chtype c);
CDKBUTTON *b,
chtype c);
CDKBUTTON *b,
chtype c);
CDKBUTTON *b,
int xpos,
int ypos,
boolean relative,
boolean refresh);
CDKBUTTON *b);
CDKBUTTON *button,
char key);

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.

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.
removes the widget from the screen and frees up any memory the object used.
draws the button widget on the screen.
If the box parameter is true, the widget is drawn with a box.
removes the widget from the screen. This does NOT destroy the widget.
returns true if the widget will be drawn with a box around it.
returns the contents of the button widget.
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:
this function returns 0, representing the button selected. The widget data exitType is set to vNORMAL.
the function returns -1. The widget data exitType is set to vESCAPE_HIT.
unless modified by preprocessing, postprocessing or key bindings, the function returns -1. The widget data exitType is set to vEARLY_EXIT.
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.
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.
allows the user to move the widget around the screen via the cursor/keypad keys. See cdk_position (3) for key bindings.
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.
sets the background attribute of the widget.
The parameter attribute is a curses attribute, e.g., A_BOLD.
sets the background color of the widget.
The parameter color is in the format of the Cdk format strings. (See cdk_display).
sets true if the widget will be drawn with a box around it.
sets the attribute of the box.
sets the horizontal drawing character for the box to the given character.
sets the lower left hand corner of the widget's box to the given character.
sets the lower right hand corner of the widget's box to the given character.
This sets the contents of the label widget.
sets the upper left hand corner of the widget's box to the given character.
sets the upper right hand corner of the widget's box to the given character.
sets the vertical drawing character for the box to the given character.

Changing the Box attribute after the widget has been created probably does not work right. None of the positioning/movement code has been tested.

Grant Edwards, Aspen Research Corporation

cdk(3), cdk_binding(3), cdk_display(3), cdk_position(3), cdk_process(3), cdk_screen(3), cdk_traverse(3)