.de It
.br
.ie \\n(.$>=3 .ne \\$3
.el .ne 3
.IP "\\$1" \\$2
..
.TH cdk_scroll 3 "24 April 1997"
.SH NAME
newCDKScroll, activateCDKScroll, injectCDKScroll, setCDKScroll, 
setCDKScrollItems, getCDKScrollItems,
setCDKScrollHighlight, getCDKScrollHighlight,
setCDKScrollBox, getCDKScrollBox, 
setCDKScrollULChar, setCDKScrollURChar,
setCDKScrollLLChar, setCDKScrollLRChar,
setCDKScrollVerticalChar, setCDKScrollHorizontalChar,
setCDKScrollBoxAttribute,
setCDKScrollBackgroundColor,
drawCDKScroll, eraseCDKScroll, 
destroyCDKScroll, setCDKScrollPreProcess, 
setCDKScrollPostProcess \- Creates a managed curses scrolling list widget.
.SH SYNOPSIS
.LP
.B cc
.RI "[ " "flag" " \|.\|.\|. ] " "file" " \|.\|.\|."
.B \-lcdk
.RI "[ " "library" " \|.\|.\|. ]"
.LP
#include <cdk.h>
.LP
.BI "CDKSCROLL *newCDKScroll (CDKSCREEN *" "cdkscreen",
.BI "int " "xpos",
.BI "int " "ypos",
.BI "int " "spos",
.BI "int " "height",
.BI "int " "width",
.BI "char *" "title",
.BI "char **" "scrollList",
.BI "int " "scrollListLength",
.BI "boolean " "numbers",
.BI "chtype " "highlight",
.BI "boolean " "box",
.BI "boolean " "shadow");
.LP
.BI "int activateCDKScroll (CDKSCROLL *" "scroll",
.BI "chtype * " "actions");
.LP
.BI "int injectCDKScroll (CDKSCROLL *" "scroll",
.BI "chtype " "input");
.LP
.BI "void setCDKScroll (CDKSCROLL *" "scroll",
.BI "char *" "value",
.BI "int " "minimumLength",
.BI "int " "maximumLength",
.BI "boolean " "box");
.LP
.BI "void setCDKScrollItems (CDKSCROLL *" "scroll",
.BI "char **" "itemList",
.BI "int " "listSize",
.BI "boolean " "numbers");
.LP
.BI "int getCDKScrollItems (CDKSCROLL *" "scroll",
.BI "char **" "itemList");
.LP
.BI "void setCDKScrollHighlight (CDKSCROLL *" "scroll",
.BI "chtype " "highlight");
.LP
.BI "chtype getCDKScrollHighlight (CDKSCROLL *" "scroll");
.LP
.BI "void setCDKScrollBox (CDKSCROLL *" "scroll",
.BI "boolean " "box");
.LP
.BI "boolean getCDKScrollBox (CDKSCROLL *" "scroll");
.LP
.BI "void addCDKScrollItem (CDKSCROLL *" "scroll",
.BI "char *" "item");
.LP
.BI "void deleteCDKScrollItem (CDKSCROLL *" "scroll",
.BI "int " "position");
.LP
.BI "void setCDKScrollULChar (CDKSCROLL *", "scroll",
.BI "chtype " "character");
.LP
.BI "void setCDKScrollURChar (CDKSCROLL *", "scroll",
.BI "chtype " "character");
.LP
.BI "void setCDKScrollLLChar (CDKSCROLL *", "scroll",
.BI "chtype " "character");
.LP
.BI "void setCDKScrollLRChar (CDKSCROLL *", "scroll",
.BI "chtype " "character");
.LP
.BI "void setCDKScrollVerticalChar (CDKSCROLL *", "scroll",
.BI "chtype " "character");
.LP
.BI "void setCDKScrollHorizontalChar (CDKSCROLL *", "scroll",
.BI "chtype " "character");
.LP
.BI "void setCDKScrollBoxAttribute (CDKSCROLL *", "scroll",
.BI "chtype " "character");
.LP
.BI "void setCDKScrollBackgroundColor (CDKSCROLL *", "scroll",
.BI "char * " "color");
.LP
.BI "void moveCDKScroll (CDKSCROLL *" "scroll",
.BI "int " "box",
.BI "int " "box",
.BI "boolean " "relative",
.BI "boolean " "refresh");
.LP
.BI "void positionCDKScroll (CDKSCROLL *" "scroll");
.LP
.BI "void drawCDKScroll (CDKSCROLL *" "scroll",
.BI "boolean " "box");
.LP
.BI "void eraseCDKScroll (CDKSCROLL *" "scroll");
.LP
.BI "void destroyCDKScroll (CDKSCROLL *" "scroll");
.LP
.BI "void setCDKScrollPreProcess (CDKSCROLL *" "scroll",
.BI "PROCESSFN " "callback",
.BI "void * " "data");
.LP
.BI "void setCDKScrollPostProcess (CDKSCROLL *" "scroll",
.BI "PROCESSFN " "callback",
.BI "void * " "data");
.LP
.BI "void bindCDKObject (EObjectType " "widgetType",
.BI "void *" "object",
.BI "chtype " "key",
.BI "BINDFN " "function",
.BI "void *" "data");
.SH DESCRIPTION
The Cdk scroll widget creates a scrolling list. The following are functions 
which create or manipulate the Cdk scrolling list widget.

.SH AVAILABLE FUNCTIONS
CDKSCROLL *newCDKScroll (CDKSCREEN *\f2screen\f1, int \f2xpos\f1, int \f2ypos\f1, int \f2spos\f1, int \f2height\f1, int \f2width\f1, char *\f2title\f1, char **\f2scrollList\f1, int \f2scrollListLength\f1, boolean \f2numbers\f1, chtype \f2highlight\f1, boolean \f2box\f1, boolean \f2shadow\f1);
.RS 3
This function creates a pointer to a scroll widget. The \f2screen\f1 parameter
is the screen you wish this widget to be placed in. The parameter \f2xpos\f1
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 \f4LEFT\f1,
\f4RIGHT\f1, and \f4CENTER\f1. The parameter \f2ypos\f1 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 \f4TOP\f1, \f4BOTTOM\f1, and \f4CENTER\f1.
The parameter \f2spos\f1 is where the scroll bar is to be placed. This can
accept one of three values: \f4LEFT\f1, which puts the scroll bar on the left
of the scrolling list. \f4RIGHT\f1 which puts the scroll bar on the right side
of the list, and \f4NONE\f1 which does not add a scroll bar. The parameters 
\f2height\f1 and \f2width\f1 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 \f2title\f1 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 \f2scrollList\f1 is 
the list of items to be displayed in the scrolling list; \f2scrollListLength\f1 
is the number of elements in the given list. The parameter \f2numbers\f1 is a 
boolean value stating that you want the items in the list to have a number 
attached to the front of the list items. The \f2highlight\f1 parameter specifies 
the display attribute of the currently selected item. The \f2box\f1 parameter 
states whether the widget will be drawn with a box around it or not. The \f2shadow\f1 
parameter accepts a boolean value to turn the shadow on or off around this widget. 
If the widget could not be created then a \f4NULL\f1 pointer is returned.
.RE

int activateCDKScroll (CDKSCROLL *\f2scroll\f1, chtype *\f2actions\f1);
.RS 3
This function activates the scroll widget and lets the user interact with the
widget. The parameter \f2scroll\f1 is a pointer to a non-NULL scroll widget.
If the \f2actions\f1 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 \f4NULL\f1 pointer for \f2actions\f1. If the character entered
into this widget is \f4RETURN\f1 or \f4TAB\f1 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 \f4exitType\f1 to \f4vNORMAL\f1. If the 
character entered into this widget was \f4ESCAPE\f1 then the widget will return
a value of -1 and the structure member \f4exitType\f1 will be set to
\f4vESCAPE_HIT\f1.
.RE

int injectCDKScroll (CDKSCROLL *\f2scroll\f1, chtype \f2character\f1);
.RS 3
This function injects a single character into the widget. The parameter 
\f2scroll\f1 is a pointer to a non-NULL scroll widget. The parameter 
\f2character\f1 is the character to inject into the widget. If the character 
injected into this widget was \f4RETURN\f1 then the character injected into
this widget is \f4RETURN\f1 or \f4TAB\f1 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 \f4exitType\f1 to \f4vNORMAL\f1. If the 
character entered into this widget was \f4ESCAPE\f1 then the widget will return
a value of -1 and the structure member \f4exitType\f1 will be set to
\f4vESCAPE_HIT\f1. Any other character injected into the widget will set the 
structure member \f4exitType\f1 to \f4vEARLY_EXIT\f1 and the function will 
return -1.
.RE

void setCDKScroll (CDKSCROLL *\f2scroll\f1, char **\f2scrollList\f1, int \f2scrollListLength\f1, boolean \f2numbers\f1, chtype \f2highlight\f1, boolean \f2box\f1);
.RS 3
This function lets the programmer modify certain elements of an already defined
scroll widget. The parameter names correspond to the same parameter names listed
in the \f4newCDKScroll\f1 function.
.RE

void setCDKScrollItems (CDKSCROLL *\f2scroll\f1, char **\f2itemList\f1, int \f2listSize\f1, boolean \f2numbers\f1);
.RS 3
This function sets the contents of the scrolling list.
.RE 

int getCDKScrollItems (CDKSCROLL *\f2scroll\f1, char **\f2itemList\f1);
.RS 3
This fills the parameter \f2itemList\f1 with the contents of the scrolling
list. It returns the number of elements in the scrolling list.
.RE

void setCDKScrollHighlight (CDKSCROLL *\f2scroll\f1, chtype \f2highlight\f1);
.RS 3
This sets the attribute of the highlight bar.
.RE

chtype getCDKScrollHighlight (CDKSCROLL *\f2scroll\f1);
.RS 3
This returns the attribute of the highlight bar.
.RE

void setCDKScrollBox (CDKSCROLL *\f2scroll\f1, boolean \f2boxWidget\f1);
.RS 3
This sets whether or not the widget will be draw with a box around it.
.RE

boolean getCDKScrollBox (CDKSCROLL *\f2scroll\f1);
.RS 3
This returns whether or not the widget will be drawn with a box around it.
.RE

void addCDKScrollItem (CDKSCROLL *\f2scroll\f1, char *\f2item\f1);
.RS 3
This function allows the user to add an item into an already defined scrolling
list. The \f2scroll\f1 parameter is a pointer to the scrolling list to add the
item to. The parameter \f2item\f1 is a \f4char *\f1 representing the new item
to add. The item is always added to the end of the list.
.RE

void deleteCDKScrollItem (CDKSCROLL *\f2scroll\f1, int \f2position\f1);
.RS 3
This function allows the user to add an item into an already defined scrolling
list. The \f2scroll\f1 parameter is a pointer to the scrolling list to add the
item to. The parameter \f2f2position\f1 is an \f4int\f1 which specifies which
element to remove.
.RE

void setCDKScrollULChar (CDKSCROLL *\f2scroll\f1, chtype \f2character\f1);
.RS 3
This function sets the upper left hand corner of the widgets box to
the given character.
.RE

void setCDKScrollURChar (CDKSCROLL *\f2scroll\f1, chtype \f2character\f1);
.RS 3
This function sets the upper right hand corner of the widgets box to
the given character.
.RE

void setCDKScrollLLChar (CDKSCROLL *\f2scroll\f1, chtype \f2character\f1);
.RS 3
This function sets the lower left hand corner of the widgets box to
the given character.
.RE

void setCDKScrollLRChar (CDKSCROLL *\f2scroll\f1, chtype \f2character\f1);
.RS 3
This function sets the lower right hand corner of the widgets box to
the given character.
.RE

void setCDKScrollVerticalChar (CDKSCROLL *\f2scroll\f1, chtype \f2character\f1);
.RS 3
This function sets the vertical drawing character for the box to
the given character.
.RE

void setCDKScrollHorizontalChar (CDKSCROLL *\f2scroll\f1, chtype \f2character\f1);
.RS 3
This function sets the horizontal drawing character for the box to
the given character.
.RE

void setCDKScrollBoxAttribute (CDKSCROLL *\f2scroll\f1, chtype \f2attribute\f1);
.RS 3
This function sets the attribute of the box.
.RE

void setCDKScrollBackgroundColor (CDKSCROLL *\f2scroll\f1, char *\f2color\f1);
.RS 3
This sets the background color of the widget. The parameter \f2color\f1
is in the format of the Cdk format strings. To get more information look
at the \f4cdk_display\f1 manual page.
.RE

void moveCDKScroll (CDKSCROLL *\f2scroll\f1, int \f2xpos\f1, int \f2ypos\f1, boolean \f2relative\f1, boolean \f2refresh\f1);
.RS 3
This function moves the given widget to the given position. The parameters
\f2xpos\f1 and \f2ypos\f1 is the new position of the widget. The parameter
\f2xpos\f1 can accept an integer value or one of the pre-defined values of
\f4TOP\f1, \f4BOTTOM\f1, and \f4CENTER\f1. The parameter \f2ypos\f1 can 
accept an integer value or one of the pre-defined values of \f4LEFT\f1,
\f4RIGHT\f1, and \f4CENTER\f1. The parameter \f2relative\f1 states whether
the \f2xpos\f1/\f2ypos\f1 pair is a relative move or an absolute move. For
example if \f2xpos\f1 = 1 and \f2ypos\f1 = 2 and \f2relative\f1 = \f2TRUE\f1,
then the widget would move one row down and two columns right. If the value
of \f2relative\f1 was \f2FALSE\f1 then the widget would move to the position
(1,2). Do not use the values of \f4TOP\f1, \f4BOTTOM\f1, \f4LEFT\f1, 
\f4RIGHT\f1, or \f4CENTER\f1 when \f2relative\f1 = \f4TRUE\f1. (wierd things
may happen). The final parameter \f2refresh\f1 is a boolean value which states
whether the widget will get refreshed after the move or not.
.RE

void positionCDKScroll (CDKSCROLL *\f2scroll\f1);
.RS 3
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.
.LP
.nf
\f4Key Bindings\f1
.RS 3
\f2Key          Action\f1
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.
.fi
.RE
.RS 3
.LP
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.)
.LP
void drawCDKScroll (CDKSCROLL *\f2scroll\f1, boolean \f2box\f1);
.RS 3
This function draws the scroll widget on the screen. The \f2box\f1 option 
draws the widget with or without a box.
.RE

void eraseCDKScroll (CDKSCROLL *\f2scroll\f1);
.RS 3
This function removes the widget from the screen. This does \f4NOT\f1 destroy
the widget.
.RE

void destroyCDKScroll (CDKSCROLL *\f2scroll\f1);
.RS 3
This function removes the widget from the screen and frees up any memory the
object may be using.
.RE

void setCDKScrollPreProcess (CDKSCROLL *\f2scroll\f1, PROCESSFN \f2function\f1, void *\f2data\f1);
.RS 3
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 \f2function\f1
if of type \f4PROCESSFN\f1. The parameter \f2data\f1 is a pointer to 
\f4void\f1. To learn more about pre-processing read the \f4cdk_process\f1
manual page.
.RE
 
void setCDKScrollPostProcess (CDKSCROLL *\f2scroll\f1, PROCESSFN \f2function\f1, void *\f2data\f1);
.RS 3
This function allows the user to have the widget call a function after the
key has been applied to the widget.  The parameter \f2function\f1 if of type
\f4PROCESSFN\f1. The parameter \f2data\f1 is a pointer to \f4void\f1. To
learn more about post-processing read the \f4cdk_process\f1 manual page.
.RE

void bindCDKObject (EObjectType \f2widgetType\f1, void *\f2object\f1, char \f2key\f1, BINDFN \f2function\f1, void *\f2data\f1);
.RS 3
This function allows the user to create special key bindings. The 
\f2widgetType\f1 parameter is a defined type which states what Cdk object 
type is being used.  To learn more about the type \f4EObjectType\f1 read the 
\f4cdk_binding\f1 manual page. The \f2object\f1 parameter is the pointer to 
the widget object. The \f2key\f1 is the character to bind. The \f2function\f1 
is the function type. To learn more about the key binding callback function 
types read the \f4cdk_binding\f1 manual page. The last parameter \f2data\f1 
is a pointer to any data that needs to get passed to the callback function.
.RE
.SH 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.
.LP
.nf
.RS 3
\f2Key         Action\f1
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.
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 \f4exitType\f1 in the widget pointer
            to the value of \f4vNORMAL\f1.
Tab         Exits the widget and returns an integer
            value representing which item was
            selected. This also sets the structure
            member \f4exitType\f1 in the widget
            pointer to the value of \f4vNORMAL\f1.
Escape      Exits the widget and returns -1. This
            also sets the structure member
            \f4exitType\f1 in the widget pointer to
            the value of \f4vESCAPE_HIT\f1.
Ctrl-L      Refreshes the screen.
.RE
.fi
.SH SEE ALSO
.BR cdk (3),
.BR cdk_binding (3),
.BR cdk_display (3),
.BR cdk_screen (3)
.SH NOTES
.PP
The header file \f4<cdk.h>\f1 automatically includes the header files
\f4<curses.h>\f1, \f4<stdlib.h>\f1, \f4<string.h>\f1, \f4<ctype.h>\f1,
\f4<unistd.h>\f1, \f4<dirent.h>\f1, \f4<time.h>\f1, \f4<errno.h>\f1,
\f4<pwd.h>\f1, \f4<grp.h>\f1, \f4<sys/stat.h>\f1, and \f4<sys/types.h>\f1.
The \f4<curses.h>\f1 header file includes \f4<stdio.h>\f1 and \f4<unctrl.h>\f1.
.PP
If you have \f4Ncurses\f1 installed on your machine add -DNCURSES to the 
compile line to include the Ncurses header files instead.