Provided by: libcdk5-dev_5.0.20230201-4_amd64 
NAME
cdk_slider - curses slider widget (type int)
SYNOPSIS
cc [ flag ... ] file ... -lcdk [ library ... ]
#include <cdk.h>
int activateCDKSlider (
CDKSLIDER *slider,
chtype *actions);
void destroyCDKSlider (
CDKSLIDER *slider);
void drawCDKSlider (
CDKSLIDER *slider,
boolean box);
void eraseCDKSlider (
CDKSLIDER *slider);
boolean getCDKSliderBox (
CDKSLIDER *slider);
int getCDKSliderHighValue (
CDKSLIDER *slider);
int getCDKSliderLowValue (
CDKSLIDER *slider);
int getCDKSliderValue (
CDKSLIDER *slider);
int injectCDKSlider (
CDKSLIDER *slider,
chtype input);
void moveCDKSlider (
CDKSLIDER *slider,
int xpos,
int ypos,
boolean relative,
boolean refresh);
CDKSLIDER *newCDKSlider (
CDKSCREEN *cdkscreen,
int xpos,
int ypos,
const char *title,
const char *label,
chtype fillerCharacter,
int fieldWidth,
int currentValue,
int lowValue,
int highValue,
int increment,
int fastIncrement,
boolean box,
boolean shadow);
void positionCDKSlider (
CDKSLIDER *slider);
void setCDKSlider (
CDKSLIDER *slider,
int lowValue,
int highValue,
int currentValue,
boolean box);
void setCDKSliderBackgroundAttrib (
CDKSLIDER *slider,
chtype attribute);
void setCDKSliderBackgroundColor (
CDKSLIDER *slider,
const char * color);
void setCDKSliderBox (
CDKSLIDER *slider,
boolean boxWidget);
void setCDKSliderBoxAttribute (
CDKSLIDER *slider,
chtype character);
void setCDKSliderHorizontalChar (
CDKSLIDER *slider,
chtype character);
void setCDKSliderLLChar (
CDKSLIDER *slider,
chtype character);
void setCDKSliderLRChar (
CDKSLIDER *slider,
chtype character);
void setCDKSliderLowHigh (
CDKSLIDER *slider,
int lowValue,
int highValue);
void setCDKSliderPostProcess (
CDKSLIDER *slider,
PROCESSFN callback,
void * data);
void setCDKSliderPreProcess (
CDKSLIDER *slider,
PROCESSFN callback,
void * data);
void setCDKSliderULChar (
CDKSLIDER *slider,
chtype character);
void setCDKSliderURChar (
CDKSLIDER *slider,
chtype character);
void setCDKSliderValue (
CDKSLIDER *slider,
int value);
void setCDKSliderVerticalChar (
CDKSLIDER *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
activateCDKSlider
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
unknownInt value (see the cdk_objs.h header file). The widget data exitType is set
to vESCAPE_HIT.
destroyCDKSlider
removes the widget from the screen and frees memory the object used.
drawCDKSlider
draws the slider widget on the screen. If the box option is true, the widget is
drawn with a box.
eraseCDKSlider
removes the widget from the screen. This does NOT destroy the widget.
getCDKSliderBox
returns true if the widget will be drawn with a box around it.
getCDKSliderHighValue
returns the high value of the slider widget.
getCDKSliderLowValue
returns the low value of the slider widget.
getCDKSliderValue
returns the current value of the widget.
injectCDKSlider
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 unknownInt 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 unknownInt value (see the cdk_objs.h header file). The widget
data exitType is set to vEARLY_EXIT.
moveCDKSlider
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 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 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.
newCDKSlider
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 activated.
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.
positionCDKSlider
allows the user to move the widget around the screen via the cursor/keypad keys. See
cdk_position (3) for key bindings.
setCDKSlider
lets the programmer modify certain elements of an existing slider widget. The
parameter names correspond to the same parameter names listed in the newCDKSlider
function.
setCDKSliderBackgroundAttrib
sets the background attribute of the widget.
The parameter attribute is a curses attribute, e.g., A_BOLD.
setCDKSliderBackgroundColor
sets the background color of the widget.
The parameter color is in the format of the Cdk format strings.
See cdk_display (3).
setCDKSliderBox
sets whether the widget will be drawn with a box around it.
setCDKSliderBoxAttribute
function sets the attribute of the box.
setCDKSliderHorizontalChar
sets the horizontal drawing character for the box to the given character.
setCDKSliderLLChar
sets the lower left hand corner of the widget's box to the given character.
setCDKSliderLRChar
sets the lower right hand corner of the widget's box to the given character.
setCDKSliderLowHigh
sets the low and high values of the widget.
setCDKSliderPostProcess
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).
setCDKSliderPreProcess
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).
setCDKSliderULChar
sets the upper left hand corner of the widget's box to the given character.
setCDKSliderURChar
sets the upper right hand corner of the widget's box to the given character.
setCDKSliderValue
sets the current value of the widget.
setCDKSliderVerticalChar
sets the vertical drawing character for the box to the given character.
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 │
├─────────────────────────────────────────────────────────────────────┤
│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 │
│ vNORMAL. │
│Tab Exits the widget and returns the current value. │
│ This also sets the widget data exitType to │
│ vNORMAL. │
│Escape Exits the widget and returns the unknownInt 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 ALSO
cdk(3), cdk_binding(3), cdk_display(3), cdk_position(3), cdk_screen(3)
cdk_slider(3)