'\" t
.\" $Id: cdk_selection.3,v 1.29 2019/02/20 14:28:42 tom Exp $"
.de bP
.ie n  .IP \(bu 4
.el    .IP \(bu 2
..
.de XX
..
.TH cdk_selection 3
.SH NAME
.XX activateCDKSelection
.XX destroyCDKSelection
.XX drawCDKSelection
.XX eraseCDKSelection
.XX getCDKSelectionBox
.XX getCDKSelectionChoice
.XX getCDKSelectionChoices
.XX getCDKSelectionCurrent
.XX getCDKSelectionHighlight
.XX getCDKSelectionItems
.XX getCDKSelectionMode
.XX getCDKSelectionModes
.XX getCDKSelectionTitle
.XX injectCDKSelection
.XX moveCDKSelection
.XX newCDKSelection
.XX positionCDKSelection
.XX setCDKSelection
.XX setCDKSelectionBackgroundAttrib
.XX setCDKSelectionBackgroundColor
.XX setCDKSelectionBox
.XX setCDKSelectionBoxAttribute
.XX setCDKSelectionChoice
.XX setCDKSelectionChoices
.XX setCDKSelectionCurrent
.XX setCDKSelectionHighlight
.XX setCDKSelectionHorizontalChar
.XX setCDKSelectionItems
.XX setCDKSelectionLLChar
.XX setCDKSelectionLRChar
.XX setCDKSelectionMode
.XX setCDKSelectionModes
.XX setCDKSelectionPostProcess
.XX setCDKSelectionPreProcess
.XX setCDKSelectionTitle
.XX setCDKSelectionULChar
.XX setCDKSelectionURChar
.XX setCDKSelectionVerticalChar
cdk_selection \- curses selection list widget.
.SH SYNOPSIS
.LP
.B cc
.RI "[ " "flag" " \|.\|.\|. ] " "file" " \|.\|.\|."
.B \-lcdk
.RI "[ " "library" " \|.\|.\|. ]"
.LP
#include <cdk.h>
.nf
.TP 15
.B "int activateCDKSelection ("
.BI "CDKSELECTION *" "selection",
.BI "chtype * " "actions");
.TP 15
.B "void destroyCDKSelection ("
.BI "CDKSELECTION *" "selection");
.TP 15
.B "void drawCDKSelection ("
.BI "CDKSELECTION *" "selection",
.BI "boolean " "box");
.TP 15
.B "void eraseCDKSelection ("
.BI "CDKSELECTION *" "selection");
.TP 15
.B "boolean getCDKSelectionBox ("
.BI "CDKSELECTION *" "selection");
.TP 15
.B "int getCDKSelectionChoice ("
.BI "CDKSELECTION *" "selection",
.BI "int " "index");
.TP 15
.B "int *getCDKSelectionChoices ("
.BI "CDKSELECTION *" "selection");
.TP 15
.B "int getCDKSelectionCurrent ("
.BI "CDKSELECTION *" "selection");
.TP 15
.B "chtype getCDKSelectionHighlight ("
.BI "CDKSELECTION *" "selection");
.TP 15
.B "int getCDKSelectionItems ("
.BI "CDKSELECTION *" "selection",
.BI "char **" "list");
.TP 15
.B "int getCDKSelectionMode ("
.BI "CDKSELECTION *" "selection",
.BI "int " "index");
.TP 15
.B "int *getCDKSelectionModes ("
.BI "CDKSELECTION *" "selection");
.TP 15
.B "char *getCDKSelectionTitle ("
.BI "CDKSELECTION *" "selection");
.TP 15
.B "int injectCDKSelection ("
.BI "CDKSELECTION *" "selection",
.BI "chtype " "input");
.TP 15
.B "void moveCDKSelection ("
.BI "CDKSELECTION *" "selection",
.BI "int " "xpos",
.BI "int " "ypos",
.BI "boolean " "relative",
.BI "boolean " "refresh");
.TP 15
.B "CDKSELECTION *newCDKSelection ("
.BI "CDKSCREEN *" "cdkscreen",
.BI "int " "xpos",
.BI "int " "ypos",
.BI "int " "spos",
.BI "int " "height",
.BI "int " "width",
.BI "const char *" "title",
.BI "CDK_CONST char **" "selectionList",
.BI "int " "selectionListLength",
.BI "CDK_CONST char **" "choiceList",
.BI "int " "choiceListLength",
.BI "chtype " "highlight",
.BI "boolean " "box",
.BI "boolean " "shadow");
.TP 15
.B "void positionCDKSelection ("
.BI "CDKSELECTION *" "selection");
.TP 15
.B "void setCDKSelection ("
.BI "CDKSELECTION *" "selection",
.BI "chtype " "highlight",
.BI "int *" "defChoices",
.BI "boolean " "box");
.TP 15
.B "void setCDKSelectionBackgroundAttrib ("
.BI "CDKSELECTION *" "selection",
.BI "chtype " "attribute");
.TP 15
.B "void setCDKSelectionBackgroundColor ("
.BI "CDKSELECTION *" "selection",
.BI "const char * " "color");
.TP 15
.B "void setCDKSelectionBox ("
.BI "CDKSELECTION *" "selection",
.BI "boolean " "boxWidget");
.TP 15
.B "void setCDKSelectionBoxAttribute ("
.BI "CDKSELECTION *" "selection",
.BI "chtype " "character");
.TP 15
.B "void setCDKSelectionChoice ("
.BI "CDKSELECTION *" "selection",
.BI "int " "index",
.BI "int " "choice");
.TP 15
.B "void setCDKSelectionChoices ("
.BI "CDKSELECTION *" "selection",
.BI "int *" "choices");
.TP 15
.B "void setCDKSelectionCurrent ("
.BI "CDKSELECTION *" "selection",
.BI "int" "index");
.TP 15
.B "void setCDKSelectionHighlight ("
.BI "CDKSELECTION *" "selection",
.BI "chtype " "highlight");
.TP 15
.B "void setCDKSelectionHorizontalChar ("
.BI "CDKSELECTION *" "selection",
.BI "chtype " "character");
.TP 15
.B "void setCDKSelectionItems ("
.BI "CDKSELECTION *" "selection",
.BI "CDK_CONST char **" "list",
.BI "int " "listSize");
.TP 15
.B "void setCDKSelectionLLChar ("
.BI "CDKSELECTION *" "selection",
.BI "chtype " "character");
.TP 15
.B "void setCDKSelectionLRChar ("
.BI "CDKSELECTION *" "selection",
.BI "chtype " "character");
.TP 15
.B "void setCDKSelectionMode ("
.BI "CDKSELECTION *" "selection",
.BI "int " "index",
.BI "int " "mode");
.TP 15
.B "void setCDKSelectionModes ("
.BI "CDKSELECTION *" "selection",
.BI "int *" "modes");
.TP 15
.B "void setCDKSelectionPostProcess ("
.BI "CDKSELECTION *" "selection",
.BI "PROCESSFN " "callback",
.BI "void * " "data");
.TP 15
.B "void setCDKSelectionPreProcess ("
.BI "CDKSELECTION *" "selection",
.BI "PROCESSFN " "callback",
.BI "void * " "data");
.TP 15
.B "void setCDKSelectionTitle ("
.BI "CDKSELECTION *" "selection",
.BI "const char *" "title");
.TP 15
.B "void setCDKSelectionULChar ("
.BI "CDKSELECTION *" "selection",
.BI "chtype " "character");
.TP 15
.B "void setCDKSelectionURChar ("
.BI "CDKSELECTION *" "selection",
.BI "chtype " "character");
.TP 15
.B "void setCDKSelectionVerticalChar ("
.BI "CDKSELECTION *" "selection",
.BI "chtype " "character");
.fi
.SH DESCRIPTION
The Cdk selection widget creates a selection list.
The following functions create or manipulate the Cdk selection list widget.
.SH AVAILABLE FUNCTIONS
.TP 5
.B activateCDKSelection
activates the selection widget and lets the user interact with the widget.
.RS
.bP
The parameter \fBselection\fR is a pointer to a non-NULL selection widget.
.bP
If the \fBactions\fR parameter is passed with a non-NULL value, the characters
in the array will be injected into the widget.
.IP
To activate the widget
interactively pass in a \fINULL\fR pointer for \fBactions\fR.
.RE
.IP
If the character entered
into this widget is \fIRETURN\fR or \fITAB\fR then this function will return 1.
It will also set the widget data \fIexitType\fR to \fIvNORMAL\fR.
If the
character entered into this widget was \fIESCAPE\fR then the widget will return
a value of -1 and the widget data \fIexitType\fR will be set to
\fIvESCAPE_HIT\fR.
.TP 5
.B destroyCDKSelection
removes the widget from the screen and frees memory the object used.
.TP 5
.B drawCDKSelection
draws the selection widget on the screen.
If the \fBbox\fR parameter is true, the widget is drawn with a box.
.TP 5
.B eraseCDKSelection
removes the widget from the screen.
This does \fINOT\fR destroy the widget.
.TP 5
.B getCDKSelectionBox
returns true if the widget will be drawn with a box around it.
.TP 5
.B getCDKSelectionChoice
returns the selection choice at the given index.
.TP 5
.B getCDKSelectionChoices
returns an array of the current selection choices for the widget.
.TP 5
.B getCDKSelectionCurrent 
returns the current selection index.
.TP 5
.B getCDKSelectionHighlight
returns the attribute of the highlight bar.
.TP 5
.B getCDKSelectionItems
optionally copies the selection-list items into the caller's list,
which must be large enough since this function does not allocate it.
If the \fIlist\fP parameter is null, no copying is done.
It returns the list size whether or not the \fIlist\fP parameter is null.
.TP 5
.B getCDKSelectionMode
returns the selection mode at the given index.
.TP 5
.B getCDKSelectionModes
returns an array of the current modes for the widget.
.TP 5
.B getCDKSelectionTitle
returns the first line of the title of the selection widget.
The caller must free the returned value.
.TP 5
.B injectCDKSelection
injects a single character into the widget.
.RS
.bP
The parameter \fBselection\fR is a pointer to a non-NULL selection widget.
.bP
The parameter \fBcharacter\fR is the character to inject into the widget.
.RE
.IP
The return value and side-effect (setting the widget data \fIexitType\fP)
depend upon the injected character:
.RS
.TP
\fIRETURN\fP or \fITAB\fR
the function returns
1.
The widget data \fIexitType\fR is set to \fIvNORMAL\fR.
.TP
\fIESCAPE\fP
the function returns
-1.
\fIvESCAPE_HIT\fR.
The widget data \fIexitType\fR is set to \fIvESCAPE_HIT\fR.
.TP
Otherwise
unless modified by preprocessing, postprocessing or key bindings,
the function returns
-1.
The widget data \fIexitType\fR is set to \fIvEARLY_EXIT\fR.
.RE
.TP 5
.B moveCDKSelection
moves the given widget to the given position.
.RS
.bP
The parameters \fBxpos\fR and \fBypos\fR are the new position of the widget.
.bP
The parameter \fBxpos\fR may be an integer or one of the pre-defined values
\fITOP\fR, \fIBOTTOM\fR, and \fICENTER\fR.
.bP
The parameter \fBypos\fR may be an integer
or one of the pre-defined values \fILEFT\fR, \fIRIGHT\fR, and \fICENTER\fR.
.bP
The parameter \fBrelative\fR states whether
the \fBxpos\fR/\fBypos\fR pair is a relative move or an absolute move.
.IP
For example,
if \fBxpos\fR = 1 and \fBypos\fR = 2 and \fBrelative\fR = \fBTRUE\fR,
then the widget would move one row down and two columns right.
If the value of \fBrelative\fR was \fBFALSE\fR,
then the widget would move to the position (1,2).
.IP
Do not use the values \fITOP\fR, \fIBOTTOM\fR, \fILEFT\fR,
\fIRIGHT\fR, or \fICENTER\fR when \fBrelative\fR = \fITRUE\fR.
(weird things may happen).
.bP
The final parameter \fBrefresh\fR is a boolean value which
states whether the widget will get refreshed after the move.
.RE
.TP 5
.B newCDKSelection
creates a selection widget and returns a pointer to it.
Parameters:
.RS
.TP 5
\fBscreen\fR
is the screen you wish this widget to be placed in.
.TP 5
\fBxpos\fR
controls the placement of the object along the horizontal axis.
It may be an integer or one of the pre-defined values
\fILEFT\fR, \fIRIGHT\fR, and \fICENTER\fR.
.TP 5
\fBypos\fR
controls the placement of the object along the vertical axis.
It may be an integer or one of the pre-defined values
\fITOP\fR, \fIBOTTOM\fR, and \fICENTER\fR.
.TP 5
\fBspos\fR
is where the scroll bar is to be placed.
It may be one of three values:
.RS
.TP 5
\fILEFT\fR
puts the scroll bar on the left
of the scrolling list.
\fIRIGHT\fR
puts the scroll bar on the right side of the list, and
.TP 5
\fINONE\fR
does not add a scroll bar.
.RE
.TP 5
\fBheight\fR and
.TP 5
\fBwidth\fR
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.
.TP 5
\fBtitle\fR
is the string which to display at the top of the widget.
The title can be more than one line; just
provide a carriage return character at the line break.
.TP 5
\fBselectionList\fR
is the list of items to display in the selection list
.TP 5
\fBselectionListLength\fR
is the number of elements in the given list.
.TP 5
\fBchoiceList\fR
is the list of choices that will
be selected when the user presses the space bar.
.TP 5
\fBchoiceListLength\fR
is the length of this list.
.TP 5
\fBhighlight\fR
specifies the display attribute of the currently selected item.
.TP 5
\fBbox\fR
is true if the widget should be drawn with a box around it.
.TP 5
\fBshadow\fR
turns the shadow on or off around this widget.
.RE
.IP
If the widget could not be created then a \fINULL\fR pointer is returned.
.TP 5
.B positionCDKSelection
allows the user to move the widget around the screen via the cursor/keypad keys.
See \fBcdk_position (3)\fR for key bindings.
.TP 5
.B setCDKSelection
lets the programmer modify certain elements of an existing selection widget.
The parameter names correspond to the same
parameter names listed in the \fBnewCDKSelection\fR function.
.TP 5
.B setCDKSelectionBackgroundAttrib
sets the background attribute of the widget.
The parameter \fBattribute\fR is a curses attribute, e.g., A_BOLD.
.TP 5
.B setCDKSelectionBackgroundColor
sets the background color of the widget.
The parameter \fBcolor\fR
is in the format of the Cdk format strings.
See \fBcdk_display (3)\fR.
.TP 5
.B setCDKSelectionBox
sets whether the widget will be drawn with a box around it.
.TP 5
.B setCDKSelectionBoxAttribute
sets the attribute of the box.
.TP 5
.B setCDKSelectionChoice
sets the selection choice value at the given index.
.TP 5
.B setCDKSelectionChoices
sets the selection choice values of the widget.
.TP 5
.B setCDKSelectionCurrent 
sets the current selection index.
.TP 5
.B setCDKSelectionHighlight
sets the attribute of the highlight bar.
.TP 5
.B setCDKSelectionHorizontalChar
sets the horizontal drawing character for the box to the given character.
.TP 5
.B setCDKSelectionItems
sets the selection list items.
The previous selection list items stored in the widget are freed.
.TP 5
.B setCDKSelectionLLChar
sets the lower left hand corner of the widget's box to the given character.
.TP 5
.B setCDKSelectionLRChar
sets the lower right hand corner of the widget's box to the given character.
.TP 5
.B setCDKSelectionMode
sets the selection mode at the given index.
.TP 5
.B setCDKSelectionModes
sets the selection mode of the elements of the widget.
There are two acceptable values for the modes:
.RS 5
.TP 3
0
which allows the user to change the selection value at the given index; and
.TP 3
1
which sets the element to a read-only state.
.RE
.TP 5
.B setCDKSelectionPostProcess
allows the user to have the widget call a function after the
key has been applied to the widget.
The parameter \fBfunction\fR is the callback function.
The parameter \fBdata\fR points to data passed to the callback function.
To learn more about post-processing see \fIcdk_process (3)\fR.
.TP 5
.B setCDKSelectionPreProcess
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 \fBfunction\fR is the callback function.
The parameter \fBdata\fR is a pointer to
\fIvoid\fR.
To learn more about pre-processing see \fIcdk_process (3)\fR.
.TP 5
.B setCDKSelectionTitle
set the selection list's title.
.TP 5
.B setCDKSelectionULChar
sets the upper left hand corner of the widget's box to the given character.
.TP 5
.B setCDKSelectionURChar
sets the upper right hand corner of the widget's box to the given character.
.TP 5
.B setCDKSelectionVerticalChar
sets the vertical drawing character for the box to the given character.
.SH KEY BINDINGS
When the widget is activated there are several default key bindings which
help the user enter or manipulate the information quickly:
.LP
.TS
center tab(/) box;
l l
l l
lw15 lw35 .
\fBKey/Action\fR
=
Left Arrow/T{
Shift the whole list left one column.
T}
Right Arrow/T{
Shift the whole list right one column.
T}
Up Arrow/T{
Select the previous item in the list.
T}
Down Arrow/T{
Select the next item in the list.
T}
_
Prev Page
Ctrl-B/Scroll one page backward.
_
Next Page
Ctrl-F/Scroll one page forward.
_
1
<
g
Home/Move to the first element in the list.
_
>
G
End/Move to the last element in the list.
_
$/Shift the whole list to the far right.
|/Shift the whole list to the far left.
_
Space/T{
Cycles to the next choice on the current item.
T}
Return/T{
Exit the widget and return 1.
Also set the widget data \fIexitType\fR to \fIvNORMAL\fR.
T}
Tab/T{
Exit the widget and return 1.
Also set the widget data \fIexitType\fR to \fIvNORMAL\fR.
T}
Escape/T{
Exit the widget and return -1.
Also set the widget data \fIexitType\fR to \fIvESCAPE_HIT\fR.
T}
Ctrl-L/Refreshes the screen.
.TE
.SH SEE ALSO
.BR cdk (3),
.BR cdk_binding (3),
.BR cdk_display (3),
.BR cdk_position (3),
.BR cdk_screen (3)