cdk_uslider(3)cdk_uslider(3)NAMEcdk_uslider - curses slider widget (type unsigned)
SYNOPSIS
cc [ flag ... ] file ... -lcdk [ library ... ]
#include <cdk.h>
int activateCDKUSlider (
CDKUSLIDER *slider,
chtype *actions);
void destroyCDKUSlider (
CDKUSLIDER *slider);
void drawCDKUSlider (
CDKUSLIDER *slider,
boolean box);
void eraseCDKUSlider (
CDKUSLIDER *slider);
boolean getCDKUSliderBox (
CDKUSLIDER *slider);
unsigned getCDKUSliderHighValue (
CDKUSLIDER *slider);
unsigned getCDKUSliderLowValue (
CDKUSLIDER *slider);
unsigned getCDKUSliderValue (
CDKUSLIDER *slider);
unsigned injectCDKUSlider (
CDKUSLIDER *slider,
chtype input);
void moveCDKUSlider (
CDKUSLIDER *slider,
int xpos,
int ypos,
boolean relative,
boolean refresh);
CDKUSLIDER *newCDKUSlider (
CDKSCREEN *cdkscreen,
int xpos,
int ypos,
const char *title,
const char *label,
chtype fillerCharacter,
int fieldWidth,
int currentValue,
unsigned lowValue,
unsigned highValue,
unsigned increment,
unsigned fastIncrement,
boolean box,
boolean shadow);
void positionCDKUSlider (
CDKUSLIDER *slider);
void setCDKUSlider (
CDKUSLIDER *slider,
unsigned lowValue,
unsigned highValue,
unsigned currentValue,
boolean box);
void setCDKUSliderBackgroundAttrib (
CDKUSLIDER *slider,
chtype attribute);
void setCDKUSliderBackgroundColor (
CDKUSLIDER *slider,
const char * color);
void setCDKUSliderBox (
CDKUSLIDER *slider,
boolean boxWidget);
void setCDKUSliderBoxAttribute (
CDKUSLIDER *slider,
chtype character);
void setCDKUSliderHorizontalChar (
CDKUSLIDER *slider,
chtype character);
void setCDKUSliderLLChar (
CDKUSLIDER *slider,
chtype character);
void setCDKUSliderLRChar (
CDKUSLIDER *slider,
chtype character);
void setCDKUSliderLowHigh (
CDKUSLIDER *slider,
unsigned lowValue,
unsigned highValue);
void setCDKUSliderPostProcess (
CDKUSLIDER *slider,
PROCESSFN callback,
void * data);
void setCDKUSliderPreProcess (
CDKUSLIDER *slider,
PROCESSFN callback,
void * data);
void setCDKUSliderULChar (
CDKUSLIDER *slider,
chtype character);
void setCDKUSliderURChar (
CDKUSLIDER *slider,
chtype character);
void setCDKUSliderValue (
CDKUSLIDER *slider,
unsigned value);
void setCDKUSliderVerticalChar (
CDKUSLIDER *slider,
chtype character);
DESCRIPTION
The Cdk slider widget creates a visual slider box with a label and a
slider field. The following are functions which create or manipulate
the Cdk slider box widget.
AVAILABLE FUNCTIONS
activateCDKUSlider
activates the slider widget and lets the user interact with the
widget. The parameter slider is a pointer to a non-NULL slider
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 the low value to
the high value. It will also set the widget data exitType to
vNORMAL. If the character entered into this widget was ESCAPE
then the widget returns the unknownUnsigned value (see the
cdk_objs.h header file). The widget data exitType is set to
vESCAPE_HIT.
destroyCDKUSlider
removes the widget from the screen and frees memory the object
used.
drawCDKUSlider
draws the slider widget on the screen. If the box option is true,
the widget is drawn with a box.
eraseCDKUSlider
removes the widget from the screen. This does NOT destroy the
widget.
getCDKUSliderBox
returns true if the widget will be drawn with a box around it.
getCDKUSliderHighValue
returns the high value of the slider widget.
getCDKUSliderLowValue
returns the low value of the slider widget.
getCDKUSliderValue
returns the current value of the widget.
injectCDKUSlider
injects a single character into the widget. The parameter slider
is a pointer to a non-NULL slider widget. The parameter character
is the character to inject into the widget. The return value and
side-effect (setting the widget data exitType) depend upon the
injected character:
RETURN or TAB
the function returns a value ranging from the slider's low
value to the slider's high value. The widget data exitType
is set to vNORMAL.
ESCAPE the function returns the unknownUnsigned value (see the
cdk_objs.h header file). The widget data exitType is set
to vESCAPE_HIT.
Otherwise
unless modified by preprocessing, postprocessing or key
bindings, the function returns the unknownUnsigned value
(see the cdk_objs.h header file). The widget data exitType
is set to vEARLY_EXIT.
moveCDKUSlider
moves the given widget to the given position. The parameters xpos
and ypos are the new position of the widget. The parameter xpos
may be an integer or one of the pre-defined values TOP, BOTTOM,
and CENTER. The parameter ypos may be an integer or one of the
pre-defined values LEFT, RIGHT, and CENTER. The parameter rela‐
tive 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 TOP, BOTTOM,
LEFT, RIGHT, or CENTER when relative = TRUE. (weird things may
happen). The final parameter refresh is a boolean value which
states whether the widget will get refreshed after the move.
newCDKUSlider
function creates a slider widget and returns a pointer to it..
Parameters:
screen
is the screen you wish this widget to be placed in.
xpos controls the placement of the object along the horizontal
axis. It may be an integer or one of the pre-defined values
LEFT, RIGHT, and CENTER.
ypos controls the placement of the object along the vertical axis.
It may be an integer or one of the pre-defined values TOP,
BOTTOM, and CENTER.
title
is the string 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.
label
is the string to display in the label of the slider field.
fillerCharacter
is the character to be used to draw the slider bar in the
field.
fieldWidth
controls the width of the widget. If you provide a value of
zero the widget will be created with the full width of the
screen. If you provide a negative value, the widget will be
created the full width minus the value provided.
currentValue
is the value of the slider field when the widget is acti‐
vated.
lowValue and
highValue
are the low and high values of the widget respectively.
increment
is the regular increment value
fastIncrement
is the accelerated increment value.
box is true if the widget should be drawn with a box around it.
shadow
turns the shadow on or off around this widget.
If the widget could not be created then a NULL pointer is
returned.
positionCDKUSlider
allows the user to move the widget around the screen via the cur‐
sor/keypad keys. See cdk_position (3) for key bindings.
setCDKUSlider
lets the programmer modify certain elements of an existing slider
widget. The parameter names correspond to the same parameter
names listed in the newCDKUSlider function.
setCDKUSliderBackgroundAttrib
sets the background attribute of the widget. The parameter
attribute is a curses attribute, e.g., A_BOLD.
setCDKUSliderBackgroundColor
sets the background color of the widget. The parameter color is
in the format of the Cdk format strings. See cdk_display (3).
setCDKUSliderBox
sets whether the widget will be drawn with a box around it.
setCDKUSliderBoxAttribute
function sets the attribute of the box.
setCDKUSliderHorizontalChar
sets the horizontal drawing character for the box to the given
character.
setCDKUSliderLLChar
sets the lower left hand corner of the widget's box to the given
character.
setCDKUSliderLRChar
sets the lower right hand corner of the widget's box to the given
character.
setCDKUSliderLowHigh
sets the low and high values of the widget.
setCDKUSliderPostProcess
allows the user to have the widget call a function after the key
has been applied to the widget. The parameter function is the
callback function. The parameter data points to data passed to
the callback function. To learn more about post-processing see
cdk_process (3).
setCDKUSliderPreProcess
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 is the callback function. The parameter data points to
data passed to the callback function. To learn more about pre-
processing see cdk_process (3).
setCDKUSliderULChar
sets the upper left hand corner of the widget's box to the given
character.
setCDKUSliderURChar
sets the upper right hand corner of the widget's box to the given
character.
setCDKUSliderValue
sets the current value of the widget.
setCDKUSliderVerticalChar
sets the vertical drawing character for the box to the given char‐
acter.
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 wid‐
get.
┌─────────────────────────────────────────────────────────────────────┐
│Key Action │
├─────────────────────────────────────────────────────────────────────┤
│Down Arrow Decrements the field by the normal decrement │
│ value. │
│Up Arrow Increments the field by the normal increment │
│ value. │
│u Increments the field by the normal increment │
│ value. │
│Prev Page Decrements the field by the accelerated decrement │
│ value. │
│U Decrements the field by the accelerated decrement │
│ value. │
│Ctrl-B Decrements the field by the accelerated decrement │
│ value. │
│Next Page Increments the field by the accelerated increment │
│ value. │
│D Increments the field by the accelerated increment │
│ value. │
│Ctrl-F Increments the field by the accelerated increment │
│ value. │
│Home Sets the value to the low value. │
│g Sets the value to the low value. │
│End Sets the value to the high value. │
│G Sets the value to the high value. │
│$ Sets the value to the high value. │
│Return Exits the widget and returns the current value. │
│ This also sets the widget data exitType to vNOR‐ │
│ MAL. │
│Tab Exits the widget and returns the current value. │
│ This also sets the widget data exitType to vNOR‐ │
│ MAL. │
│Escape Exits the widget and returns the unknownUnsigned │
│ value (see the cdk_objs.h header file). This also │
│ sets the widget data exitType to vESCAPE_HIT. │
│Ctrl-R Refreshes the screen. │
└─────────────────────────────────────────────────────────────────────┘
If the cursor is not pointing to the field's value, the following key
bindings apply. You may use the left/right arrows to move the cursor
onto the field's value and modify it by typing characters to replace
the digits and sign.
┌─────────────────────────────────────────────────────────────────────┐
│Key Action │
├─────────────────────────────────────────────────────────────────────┤
│Left Arrow Decrements the scale by the normal value. │
│Right Arrow Increments the scale by the normal value. │
├─────────────────────────────────────────────────────────────────────┤
│d Decrements the scale by the normal value. │
│D Increments the scale by the accelerated value. │
│- Decrements the scale by the normal value. │
│+ Increments the scale by the normal value. │
│0 Sets the scale to the low value. │
└─────────────────────────────────────────────────────────────────────┘
SEE ALSOcdk(3), cdk_binding(3), cdk_display(3), cdk_position(3), cdk_screen(3)cdk_uslider(3)
