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.TH "INITIALIZE CHOICE" 3P "29 February 1991"
.SH NAME
INITIALIZE CHOICE  \- initialize a \s-2CHOICE\s+2 input device using \s-2\&2D\s+2 data
.IX "Choice Input Devices" "INITIALIZE CHOICE"
.IX "PFCN_KEY \s-2C\s+2 Macros" "INITIALIZE CHOICE"
.SH SYNOPSIS
.SS C Syntax
.ft B
.ta 1.25i 3.25i
.nf
void
pinit_choice ( ws, dev, istat, init, pet, echo_area, record )
Pint	ws;	\fIworkstation identifier\fP
Pint	dev;	\fIchoice device number\fP
Pin_status	istat;	\fIinitial choice status\fP
Pint	init;	\fIinitial choice\fP
Pint	pet;	\fIprompt and echo type\fP
Plimit	*echo_area;	\fIecho area pointer\fP
Pchoice_data	*record;	\fIdata record pointer\fP
.fi
.ft R
.SS Required PHIGS Operating States
(PHOP, WSOP, *, *)
.SH DESCRIPTION
.SS Purpose
\s-2INITIALIZE CHOICE\s+2 sets the initialization parameters of a
\s-2CHOICE\s+2 device.
This function stores these parameters in the workstation state list
of the workstation associated with the specified device.
The specified \fBdevice must be in \s-2REQUEST\s+2 mode\fP when this
function is called.
.SS C Input Parameters
.IP \fIws\fP
The workstation identifier of the workstation associated with the device.
.IP \fIdev\fP
The device number of the \s-2CHOICE\s+2 device to initialize.
See the \fIAVAILABLE DEVICES\fP section below for a description of the
available devices.
.IP \fIistat\fP
The \s-2CHOICE\s+2 status of the initial measure.
Pin_status is an enumerated type defined in phigs.h as follows:
.sp .4
.ta .5i
.nf
typedef enum {
.sp .2
	PIN_STATUS_NONE,
	PIN_STATUS_OK,
	PIN_STATUS_NO_IN
.sp .2
} Pin_status;
.fi
.IP \fIinit\fP
The initial choice number.  \s-2PHIGS\s+2 ignores this value if \fIistat\fP
is not \s-2PIN_STATUS_OK\s+2.
.IP \fIpet\fP
The prompt/echo type desired.
Those supported by each device are listed in the
\fIAVAILABLE DEVICES\fP section below.
.IP \fIecho_area\fP
A pointer to a Plimit structure defining the \fIx\fP and \fIy\fP
components of the echo volume, in Device Coordinates.
The \fIz\fP component in the workstation state list is left unchanged.
Plimit is defined in phigs.h as follows:
.sp .4
.nf
.ta .5i +1i  +1i
.sp .2
typedef struct {
.sp .2
	Pfloat	x_min;	/* minimum x coordinate value */
	Pfloat	x_max;	/* maximum x coordinate value */
	Pfloat	y_min;	/* minimum y coordinate value */
	Pfloat	y_max;	/* maximum y coordinate value */
.sp .2
} Plimit;
.IP
.fi
.IP \fIrecord\fP
A pointer to a Pchoice_data union containing the data record information.
The contents of the data record for each device and prompt/echo type are
described below in the \fIAVAILABLE DEVICES\fP section.
.IP
The members of the data record union correspond to the prompt/echo type
being used.
As an example, the appropriate member of the Pchoice_data union for
prompt/echo type 1 is \fIpet_r1\fP.
.IP
Pchoice_data is defined in phigs.h as:
.sp .4
.ta .5i +\w'Ppr_switch     'u +\w'num_strings;     'u
.nf
typedef struct {
.sp .2
      union {
	struct {
	   Pint	unused;
	} pet_r1;
	struct {
	   Pint	num_prompts;	/* number of alternatives	*/
	   Ppr_switch	*prompts;	/* array of prompts		*/
	} pet_r2;
	struct {
	   Pint	num_strings;	/* number of choice strings	*/
	   char	**strings;	/* array of choice strings	*/
	} pet_r3;
	struct {
	   Pint	num_strings;	/* number of alternatives	*/
	   char	**strings;	/* array of strings		*/
	} pet_r4;
	struct {
	   Pint	struct_id;	/* struct identifier		*/
	   Pint	num_pick_ids;	/* number of alternatives	*/
	   Pint	*pick_ids;	/* array of pick identifiers	*/
	} pet_r5;
      } pets;
.sp .2
} Pchoice_data;
.fi
.IP
For some prompt/echo types the data record is not used; however,
the \fIrecord\fP parameter must still be supplied.
.SS Execution
.LP
\s-2INITIALIZE CHOICE\s+2 sets the initialization parameters of a
\s-2CHOICE\s+2 device.
This function stores these parameters in the workstation state list
of the workstation associated with the specified device.
The specified device must be in \s-2REQUEST\s+2 mode when this
function is called.
.LP
The parameters that are initialized by this function are 
\fIinitial choice\fP,
\fIprompt/echo type\fP,
\fIecho volume\fP,
and
\fIinput data record\fP.
.LP
The \fIinitial choice\fP is the logical input value the device will take
on whenever it is enabled.
The device's measure retains this value until operator input changes it.
A device is enabled when \s-2REQUEST CHOICE\s+2 is called,
or when its input mode is set to \s-2SAMPLE\s+2 or \s-2EVENT\s+2.
.LP
A \s-2CHOICE\s+2 device measure consists of a \fIstatus\fP and a
\fIchoice number\fP.
\fIStatus\fP indicates whether or not one of the possible choice values
on the device was selected.
(It's possible to trigger some \s-2CHOICE\s+2 devices without selecting one
of the choices.)
The \fIchoice number\fP indicates the value selected, if any.
.LP
The \fIprompt/echo type\fP determines how the device will be presented to
the operator and respond to his actions.
Each device supports one or more prompt/echo types.
Those supported by each device are listed in the device's
description in the \fIAVAILABLE DEVICES\fP section below.
All devices support prompt/echo type 1.
Positive prompt/echo types are defined by the \s-2PHIGS\s+2 standard.
Negative types are implementation-dependent.
.LP
The \fIecho volume\fP defines the region of the display surface in which to
echo the device.
It is specified in Device Coordinates (\s-2DC\s+2).
Devices that use the echo volume may restrict their display to this
region.
Some of these devices may still recognize operator input
outside the region even though they do not display there.
This function only specifies the \fIx\fP and \fIy\fP components of the
echo volume.  The existing \fIz\fP component in the workstation state
list is left unchanged.
.LP
The \fIinput data record\fP contains the prompt/echo type specific
information that controls the device's appearance and characteristics.
Not all of the data record contents are used by some devices.
The device descriptions in the \fIAVAILABLE DEVICES\fP section below
list the data record contents that each device recognizes.
.LP
All the initialization parameters must be specified properly or this function
will generate an error.
The \fIERRORS\fP section below lists the possible error conditions.
.LP
The default initialization parameters and the list of prompt/echo types
supported by a \s-2CHOICE\s+2 input device can be inquired with the function
\s-2INQUIRE DEFAULT CHOICE DEVICE DATA\s+2.
The current state of the device can be inquired with the function
\s-2INQUIRE CHOICE DEVICE STATE\fP.
.SH AVAILABLE DEVICES
.SS Device 1 - "Athena List Widget"
.LP
This device is a collection of widgets from the Athena widget set.
The set consists of a shell widget, a viewport widget, and a list widget. The
list is the item manipulated by the operator to change the choice value.
.LP
The echo volume is not used by this device.
.LP
\fBPrompt/echo types supported\fP: 1, 3
.IP "PET 1" .8i
Display a \s-2PHIGS\s0-defined list of choice strings in the menu.  The 
choice strings are the integers \fI1\fP through \fI10\fP.
.IP
The data record is not used for this \s-2PET\s+2.
.IP "PET 3"
Display an application-specified list of choice strings in the menu.
The data record member used is \fIpet_r3\fP,
which contains the number and array of choice strings.
.LP
The widgets used and their names, in decreasing hierarchy, are:
.IP
choice1 \(-> \fIapplicationShellWidgetClass\fR
.RS
.br
viewport \(-> \fIviewportWidgetClass\fR
.RS
.br
list \(-> \fIlistWidgetClass\fR
.RE
.RE
.LP
Fallback resources for choice devices are:
.IP
*choice1*allowHoriz \(-> \fI\s-1TRUE\s+1\fR
.IP
*choice1*allowVert \(-> \fI\s-1TRUE\s+1\fR
.IP
*choice1*list.translations \(em
.RS
.br
<Btn1Down>,<Btn1Up> \(-> \fISet() Notify() RequestSatisfied()\fR
.RE
.LP
The fully qualified name of all widgets is
<appl_name>.workstation<ws_id>.choice<dev_id>.<widget_name>, where
<appl_name> is the application name specified in the call to OPEN XPHIGS.
(This will be "phigs" if OPEN XPHIGS was not called.)
For example, phigs.workstation1.choice1.viewport is the name of the
viewport widget of choice device 1 on workstation 1.
.SH ERRORS
.IP 003
Ignoring function, function requires state (\s-2PHOP, WSOP\s+2, *, *)
.IP 054
Ignoring function, the specified workstation is not open
.IP 061
Ignoring function, specified workstation is neither of category \s-2INPUT\s+2
nor of category \s-2OUTIN\s+2
.IP 250
Ignoring function, the specified device is not available
on the specified workstation
.IP 251
Ignoring function, the function requires the input device to be in \s-2REQUEST\s+2 mode
.IP 253
Warning, the specified prompt/echo type is not available on the specified
workstation.
Prompt/echo type one will be used in its place
.IP 254
Ignoring function, invalid echo area/volume;
\s-2XMIN \(>= XMAX, YMIN \(>= YMAX\s+2, or \s-2ZMIN > ZMAX\s+2
.IP 255
Ignoring function, one of the echo area/volume boundary points
is outside the range of the device
.IP 260
Ignoring function, one of the fields within the input device data record
is in error
.IP 261
Ignoring function, initial value is invalid
.SH SEE ALSO
.nf
.IP
.ta 0.5i
SET CHOICE MODE (3P)
REQUEST CHOICE (3P)
SAMPLE CHOICE (3P)
GET CHOICE (3P)
INQUIRE CHOICE DEVICE STATE (3P)
INITIALIZE CHOICE 3 (3P)
.fi
