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