Provided by: libcdk5-dev_5.0.20230201-4_amd64 
NAME
cdk_scale - curses scale widget (type int).
SYNOPSIS
cc [ flag ... ] file ... -lcdk [ library ... ]
#include <cdk.h>
int activateCDKScale (
CDKSCALE *scale,
chtype *actions);
void destroyCDKScale (
CDKSCALE *scale);
void drawCDKScale (
CDKSCALE *scale,
boolean box);
void eraseCDKScale (
CDKSCALE *scale);
boolean getCDKScaleBox (
CDKSCALE *scale);
int getCDKScaleHighValue (
CDKSCALE *scale);
int getCDKScaleLowValue (
CDKSCALE *scale);
int getCDKScaleValue (
CDKSCALE *scale);
int injectCDKScale (
CDKSCALE *scale,
chtype input);
void moveCDKScale (
CDKSCALE *scale,
int xpos,
int ypos,
boolean relative,
boolean refresh);
CDKSCALE *newCDKScale (
CDKSCREEN *cdkscreen,
int xpos,
int ypos,
const char *title,
const char *label,
chtype fieldAttribute,
int fieldWidth,
int currentValue,
int lowValue,
int highValue,
int increment,
int fastIncrement,
boolean box,
boolean shadow);
void positionCDKScale (
CDKSCALE *scale);
void setCDKScale (
CDKSCALE *scale,
int lowValue,
int highValue,
int currentValue,
boolean box);
void setCDKScaleBackgroundAttrib (
CDKSCALE *scale,
chtype attribute);
void setCDKScaleBackgroundColor (
CDKSCALE *scale,
const char * color);
void setCDKScaleBox (
CDKSCALE *scale,
boolean box);
void setCDKScaleBoxAttribute (
CDKSCALE *scale,
chtype character);
void setCDKScaleHorizontalChar (
CDKSCALE *scale,
chtype character);
void setCDKScaleLLChar (
CDKSCALE *scale,
chtype character);
void setCDKScaleLRChar (
CDKSCALE *scale,
chtype character);
void setCDKScaleLowHigh (
CDKSCALE *scale,
int low,
int high);
void setCDKScalePostProcess (
CDKSCALE *scale,
PROCESSFN callback,
void * data);
void setCDKScalePreProcess (
CDKSCALE *scale,
PROCESSFN callback,
void * data);
void setCDKScaleULChar (
CDKSCALE *scale,
chtype character);
void setCDKScaleURChar (
CDKSCALE *scale,
chtype character);
void setCDKScaleValue (
CDKSCALE *scale,
int value);
void setCDKScaleVerticalChar (
CDKSCALE *scale,
chtype character);
DESCRIPTION
The Cdk scale widget creates a scale box with a label and a scale field. The following functions create
or manipulate the Cdk scale box widget.
AVAILABLE FUNCTIONS
activateCDKScale
activates the scale widget and lets the user interact with the widget.
• The parameter scale is a pointer to a non-NULL scale 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 will return the unknownInt
value (see the cdk_objs.h header file).
The widget data exitType will be set to vESCAPE_HIT.
destroyCDKScale
removes the widget from the screen and frees memory the object used.
drawCDKScale
draws the scale widget on the screen.
If the box parameter is true, the widget is drawn with a box.
eraseCDKScale
removes the widget from the screen. This does NOT destroy the widget.
getCDKScaleBox
returns whether the widget will be drawn with a box around it.
getCDKScaleHighValue
returns the high value of the scale widget.
getCDKScaleLowValue
returns the low value of the scale widget.
getCDKScaleValue
returns the current value of the widget.
injectCDKScale
injects a single character into the widget.
• The parameter scale is a pointer to a non-NULL scale 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 scale's low value to the scale'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.
moveCDKScale
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.
newCDKScale
creates a pointer to a scale widget. 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 scale field.
fieldAttribute
is the attribute of the characters displayed 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 scale 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.
positionCDKScale
allows the user to move the widget around the screen via the cursor/keypad keys. See cdk_position
(3) for key bindings.
setCDKScale
lets the programmer modify certain elements of an existing scale widget.
The parameter names correspond to the same parameter names listed in the newCDKScale function.
setCDKScaleBackgroundAttrib
sets the background attribute of the widget.
The parameter attribute is a curses attribute, e.g., A_BOLD.
setCDKScaleBackgroundColor
sets the background color of the widget.
The parameter color is in the format of the Cdk format strings.
See cdk_display (3).
setCDKScaleBox
sets whether the widget will be drawn with a box around it.
setCDKScaleBoxAttribute
sets the attribute of the box.
setCDKScaleHorizontalChar
sets the horizontal drawing character for the box to the given character.
setCDKScaleLLChar
sets the lower left hand corner of the widget's box to the given character.
setCDKScaleLRChar
sets the lower right hand corner of the widget's box to the given character.
setCDKScaleLowHigh
sets the low and high values of the widget.
setCDKScalePostProcess
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).
setCDKScalePreProcess
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).
setCDKScaleULChar
sets the upper left hand corner of the widget's box to the given character.
setCDKScaleURChar
sets the upper right hand corner of the widget's box to the given character.
setCDKScaleValue
sets the current value of the widget.
setCDKScaleVerticalChar
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 scale by the normal value. │
│Up Arrow Increments the scale by the normal value. │
│u Increments the scale by the normal value. │
│Prev Page Decrements the scale by the accelerated value. │
│U Decrements the scale by the accelerated value. │
│Ctrl-B Decrements the scale by the accelerated value. │
│Next Page Increments the scale by the accelerated value. │
│Ctrl-F Increments the scale by the accelerated value. │
│Home Sets the scale to the low value. │
│g Sets the scale to the low value. │
│^ Sets the scale to the low value. │
│End Sets the scale to the high value. │
│G Sets the scale to the high value. │
│$ Sets the scale to the high value. │
│Return Exits the widget and returns the index of the │
│ selected value. This also sets the widget data │
│ exitType to vNORMAL. │
│Tab Exits the widget and returns the index of the │
│ selected 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_scale(3)