newCDKRadio, activateCDKRadio, injectCDKRadio, setCDKRadio, setCDKRadioHighlight, getCDKRadioHighlight, setCDKRadioChoiceCharacter, getCDKRadioChoiceCharacter, setCDKRadioLeftBrace, getCDKRadioLeftBrace, setCDKRadioRightBrace, getCDKRadioRightBrace, setCDKRadioBox, getCDKRadioBox, setCDKRadioULChar, setCDKRadioURChar, setCDKRadioLLChar, setCDKRadioLRChar, setCDKRadioVerticalChar, setCDKRadioHorizontalChar, setCDKRadioBoxAttribute, setCDKRadioBackgroundColor, drawCDKRadio, eraseCDKRadio, destroyCDKRadio, setCDKRadioPreProcess, setCDKRadioPostProcess - Creates a managed curses radio list widget.

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

#include <cdk.h>

CDKRADIO *newCDKRadio (CDKSCREEN *cdkscreen, int xpos, int ypos, int spos, int height, int width, char *title, char **radioList, int radioListLength, chtype choiceCharacter, int defaultItem, chtype highlight, boolean box, boolean shadow);

int activateCDKRadio (CDKRADIO *radio, chtype *actions);

int injectCDKRadio (CDKRADIO *radio, chtype input);

void setCDKRadio (CDKRADIO *radio, chtype highlight, chtype choiceCharacter, boolean box);

void setCDKRadioHighlight (CDKRADIO *radio, chtype highlight);

chtype getCDKRadioHighlight (CDKRADIO *radio);

void setCDKRadioChoiceCharacter (CDKRADIO *radio, chtype character);

chtype getCDKRadioChoiceCharacter (CDKRADIO *radio);

void setCDKRadioLeftBrace (CDKRADIO *radio, chtype character);

chtype getCDKRadioLeftBrace (CDKRADIO *radio);

void setCDKRadioRightBrace (CDKRADIO *radio, chtype character);

chtype getCDKRadioRightBrace (CDKRADIO *radio);

void setCDKRadioBox (CDKRADIO *radio, boolean box);

boolean getCDKRadioBox (CDKRADIO *radio);

void drawCDKRadio (CDKRADIO *radio, boolean box);

void setCDKRadioULChar (CDKRADIO *,radio, chtype character);

void setCDKRadioURChar (CDKRADIO *,radio, chtype character);

void setCDKRadioLLChar (CDKRADIO *,radio, chtype character);

void setCDKRadioLRChar (CDKRADIO *,radio, chtype character);

void setCDKRadioVerticalChar (CDKRADIO *,radio, chtype character);

void setCDKRadioHorizontalChar (CDKRADIO *,radio, chtype character);

void setCDKRadioBoxAttribute (CDKRADIO *,radio, chtype character);

void setCDKRadioBackgroundColor (CDKRADIO *,radio, char * color);

void moveCDKRadio (CDKRADIO *radio, int box, int box, boolean relative, boolean refresh);

void positionCDKRadio (CDKRADIO *radio);

void eraseCDKRadio (CDKRADIO *radio);

void destroyCDKRadio (CDKRADIO *radio);

void setCDKRadioPreProcess (CDKRADIO *radio, PROCESSFN callback, void * data);

void setCDKRadioPostProcess (CDKRADIO *radio, PROCESSFN callback, void * data);

void bindCDKObject (EObjectType widgetType, void *object, chtype key, BINDFN function, void *data);

The Cdk radio widget creates a radio list. The following are functions which create or manipulate the Cdk radio box widget.

CDKRADIO *newCDKRadio (CDKSCREEN *screen, int xpos, int ypos, int height, int width, char *title, char **radioList, int radioListLength, chtype choiceCharacter, int defaultItem, chtype highlight, boolean box, boolean shadow); This function creates a pointer to a radio widget. The screen parameter is the screen you wish this widget to be placed in. The parameter xpos controls the placement of the object along the horizontal axis. This parameter can accept an integer value or one of the pre-defined values of LEFT, RIGHT, and CENTER. The parameter ypos controls the placement of the object along the vertical axis. This parameter can accept an integer value or one of the pre-defined values of TOP, BOTTOM, and CENTER. The parameter spos is where the scroll bar is to be placed. This can accept one of three values: LEFT, which puts the scroll bar on the left of the scrolling list. RIGHT which puts the scroll bar on the right side of the list, and NONE which does not add a scroll bar. The parameters height and width control the height and width of the widget. If you provide a value of zero for either of the height or the width, the widget will be created with the full width and height of the screen. If you provide a negative value, the widget will be created the full height or width minus the value provided. The title parameter is the string which will be displayed at the top of the widget. The title can be more than one line; just provide a carriage return character at the line break. The parameter radioList is the list of items to be displayed in the radio list; radioListLength is the number of elements in the given list. The highlight parameter specifies the display attribute of the currently selected item. The choiceCharacter parameter is the character to use to highlight the current selection. The defaultItem value is an integer which corresponds to the default selection. The box parameter states whether the widget will be drawn with a box around it or not. The shadow parameter accepts a boolean value to turn the shadow on or off around this widget. If the widget could not be created then a NULL pointer is returned.

int activateCDKRadio (CDKRADIO *radio, chtype *actions); This function activates the radio widget and lets the user interact with the widget. The parameter radio is a pointer to a non-NULL radio 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 items -1, representing the item selected. It will also set the structure member exitType to vNORMAL. If the character entered into this widget was ESCAPE then the widget will return a value of -1 and the structure member exitType will be set to vESCAPE_HIT.

int injectCDKRadio (CDKRADIO *radio, chtype character); This function injects a single character into the widget. The parameter radio is a pointer to a non-NULL radio widget. The parameter character is the character to inject into the widget. If the character injected into this widget was RETURN then the character injected into this widget is RETURN or TAB then this function will return a value from 0 to the number of items -1, representing the items selected. It will also set the structure member exitType to vNORMAL. If the character entered into this widget was ESCAPE then the widget will return a value of -1 and the structure member exitType will be set to vESCAPE_HIT. Any other character injected into the widget will set the structure member exitType to vEARLY_EXIT and the function will return -1.

void setCDKRadio (CDKRADIO *radio, chtype highlight, chtype choiceCharacter, boolean box); This function lets the programmer modify certain elements of an already defined radio widget. The parameter names correspond to the same parameter names listed in the newCDKRadio function.

void setCDKRadioChoiceCharacter (CDKRADIO *radio, chtype choiceCharacter); This sets the character to use to draw the selected element in the list.

chtype getCDKRadioChoiceCharacter (CDKRADIO *radio); This returns the character being used to draw the selected element in the list.

void setCDKRadioLeftBrace (CDKRADIO *radio, chtype choiceCharacter); This sets the character to use to draw the left brace of the selection box.

chtype getCDKRadioLeftBrace (CDKRADIO *radio); This returns the character being used to draw the left brace of the selection box.

void setCDKRadioRightBrace (CDKRADIO *radio, chtype choiceCharacter); This sets the character to use to draw the right brace of the selection box.

chtype getCDKRadioRightBrace (CDKRADIO *radio); This returns the character being used to draw the right brace of the selection box.

void setCDKRadioHighlight (CDKRADIO *radio, chtype highlight); This sets the attribute of the highlight bar. chtype getCDKRadioHighlight (CDKRADIO *radio); This returns the attribute of the highlight bar. void setCDKRadioBox (CDKRADIO *radio, boolean boxWidget); This sets whether or not the widget will be draw with a box around it. boolean getCDKRadioBox (CDKRADIO *radio); This returns whether or not the widget will be drawn with a box around it.

void setCDKRadioULChar (CDKRADIO *radio, chtype character); This function sets the upper left hand corner of the widgets box to the given character.

void setCDKRadioURChar (CDKRADIO *radio, chtype character); This function sets the upper right hand corner of the widgets box to the given character.

void setCDKRadioLLChar (CDKRADIO *radio, chtype character); This function sets the lower left hand corner of the widgets box to the given character.

void setCDKRadioLRChar (CDKRADIO *radio, chtype character); This function sets the lower right hand corner of the widgets box to the given character.

void setCDKRadioVerticalChar (CDKRADIO *radio, chtype character); This function sets the vertical drawing character for the box to the given character.

void setCDKRadioHorizontalChar (CDKRADIO *radio, chtype character); This function sets the horizontal drawing character for the box to the given character.

void setCDKRadioBoxAttribute (CDKRADIO *radio, chtype attribute); This function sets the attribute of the box.

void setCDKRadioBackgroundColor (CDKRADIO *radio, char *color); This sets the background color of the widget. The parameter color is in the format of the Cdk format strings. To get more information look at the cdk_display manual page.

void moveCDKRadio (CDKRADIO *radio, int xpos, int ypos, boolean relative, boolean refresh); This function moves the given widget to the given position. The parameters xpos and ypos is the new position of the widget. The parameter xpos can accept an integer value or one of the pre-defined values of TOP, BOTTOM, and CENTER. The parameter ypos can accept an integer value or one of the pre-defined values of 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 of TOP, BOTTOM, LEFT, RIGHT, or CENTER when relative = TRUE. (wierd things may happen). The final parameter refresh is a boolean value which states whether the widget will get refreshed after the move or not.

void positionCDKRadio (CDKRADIO *radio); This function allows the user to move the widget around the screen via the cursor/keypad keys. The following key bindings can be used to move the widget around the screen.

Key Bindings
Key          Action
Up Arrow     Moves the widget up one line.
Down Arrow   Moves the widget down one line.
Left Arrow   Moves the widget left one column
Right Arrow  Moves the widget right one column
Keypad-1     Moves the widget down one line
             and left one column.
Keypad-2     Moves the widget down one line.
Keypad-3     Moves the widget down one line
             and right one column.
Keypad-4     Moves the widget left one column
Keypad-5     Centers the widget both vertically
             and horizontally.
Keypad-6     Moves the widget right one column
Keypad-7     Moves the widget up one line
             and left one column.
Keypad-8     Moves the widget up one line.
Keypad-9     Moves the widget up one line
             and right one column.
t            Moves the widget to the top of the screen.
b            Moves the widget to the bottom of the screen.
l            Moves the widget to the left of the screen.
r            Moves the widget to the right of the screen.
c            Centers the widget between the left and 
             right of the window.
C            Centers the widget between the top and 
             bottom of the window.
Escape       Returns the widget to it's original position.
Return       Exits the function and leaves the widget
             where it was.

Keypad means that if the keyboard you are using has a keypad, then the Num-Lock light has to be on in order to use the keys as listed. (The numeric keys at the top of the keyboard will work as well.)

void drawCDKRadio (CDKRADIO *radio, boolean box); This function draws the radio widget on the screen. The box option draws the widget with or without a box.

void eraseCDKRadio (CDKRADIO *radio); This function removes the widget from the screen. This does NOT destroy the widget.

void destroyCDKRadio (CDKRADIO *radio); This function removes the widget from the screen and frees up any memory the object may be using.

void setCDKRadioPreProcess (CDKRADIO *radio, PROCESSFN function, void *data); This function allows the user to have the widget call a function after a key is hit and before the key is applied to the widget. The parameter function if of type PROCESSFN. The parameter data is a pointer to void. To learn more about pre-processing read the cdk_process manual page. void setCDKRadioPostProcess (CDKRADIO *radio, PROCESSFN function, void *data); This function allows the user to have the widget call a function after the key has been applied to the widget. The parameter function if of type PROCESSFN. The parameter data is a pointer to void. To learn more about post-processing read the cdk_process manual page.

void bindCDKObject (EObjectType widgetType, void *object, char key, BINDFN function, void *data); This function allows the user to create special key bindings. The widgetType parameter is a defined type which states what Cdk object type is being used. To learn more about the type EObjectType read the cdk_binding manual page. The object parameter is the pointer to the widget object. The key is the character to bind. The function is the function type. To learn more about the key binding callback function types read the cdk_binding manual page. The last parameter data is a pointer to any data that needs to get passed to the callback function.

When the widget is activated there are several default key bindings which will help the user enter or manipulate the information quickly. The following table outlines the keys and their actions for this widget.

Key         Action
Left Arrow  Shifts the whole list left one character.
Right Arrow Shifts the whole list right one character.
Up Arrow    Selects the next item up in the list.
Down Arrow  Selects the next item down in the list.
Space       Selects/deselects the current choice.
Prev Page   Moves one page backwards.
Ctrl-B      Moves one page backwards.
Next Page   Moves one page forwards.
Ctrl-F      Moves one page forwards.
g           Moves to the first element in the list.
1           Moves to the first element in the list.
G           Moves to the last element in the list.
$           Shifts the whole list to the far right.
|           Shifts the whole list to the far left.
Return      Exits the widget and returns an integer
            value representing which item was selected.
            This also sets the structure member exitType
            in the widget pointer to the value of vNORMAL.
Tab         Exits the widget and returns an integer
            value representing which item was selected.
            This also sets the structure member exitType
            in the widget pointer to the value of vNORMAL.
Escape      Exits the widget and returns -1. This also
            sets the structure member exitType in the
            widget pointer to the value of vESCAPE_HIT.
Ctrl-L      Refreshes the screen.

cdk(3), cdk_binding(3), cdk_display(3), cdk_screen(3)

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>.

If you have Ncurses installed on your machine add -DNCURSES to the compile line to include the Ncurses header files instead.