https://invisible-island.net/cdk/manpage/
cdk_fscale(3) Library calls cdk_fscale(3)
cdk_fscale - Cdk scale widget (type float)
cc [ flag ... ] file ... -lcdk [ library ... ]
#include <cdk.h>
float activateCDKFScale (
CDKFSCALE *scale,
chtype *actions);
void destroyCDKFScale (
CDKFSCALE *scale);
void drawCDKFScale (
CDKFSCALE *scale,
boolean box);
void eraseCDKFScale (
CDKFSCALE *scale);
boolean getCDKFScaleBox (
CDKFSCALE *scale);
int getCDKFScaleDigits (
CDKFSCALE *scale);
float getCDKFScaleHighValue (
CDKFSCALE *scale);
float getCDKFScaleLowValue (
CDKFSCALE *scale);
float getCDKFScaleValue (
CDKFSCALE *scale);
int injectCDKFScale (
CDKFSCALE *scale,
chtype input);
void moveCDKFScale (
CDKFSCALE *scale,
int xpos,
int ypos,
boolean relative,
boolean refresh);
CDKFSCALE *newCDKFScale (
CDKSCREEN *cdkscreen,
int xpos,
int ypos,
const char *title,
const char *label,
chtype fieldAttribute,
int fieldWidth,
float currentValue,
float lowValue,
float highValue,
float increment,
float fastIncrement,
int digits,
boolean box,
boolean shadow);
void positionCDKFScale (
CDKFSCALE *scale);
void setCDKFScale (
CDKFSCALE *scale,
float lowValue,
float highValue,
float currentValue,
boolean box);
void setCDKFScaleBackgroundAttrib (
CDKFSCALE *scale,
chtype attribute);
void setCDKFScaleBackgroundColor (
CDKFSCALE *scale,
const char * color);
void setCDKFScaleBox (
CDKFSCALE *scale,
boolean box);
void setCDKFScaleBoxAttribute (
CDKFSCALE *scale,
chtype character);
void setCDKFScaleDigits (
CDKFSCALE *scale,
int digits);
void setCDKFScaleHorizontalChar (
CDKFSCALE *scale,
chtype character);
void setCDKFScaleLLChar (
CDKFSCALE *scale,
chtype character);
void setCDKFScaleLRChar (
CDKFSCALE *scale,
chtype character);
void setCDKFScaleLowHigh (
CDKFSCALE *scale,
float low,
float high);
void setCDKFScalePostProcess (
CDKFSCALE *scale,
PROCESSFN callback,
void * data);
void setCDKFScalePreProcess (
CDKFSCALE *scale,
PROCESSFN callback,
void * data);
void setCDKFScaleULChar (
CDKFSCALE *scale,
chtype character);
void setCDKFScaleURChar (
CDKFSCALE *scale,
chtype character);
void setCDKFScaleValue (
CDKFSCALE *scale,
float value);
void setCDKFScaleVerticalChar (
CDKFSCALE *scale,
chtype character);
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.
activateCDKFScale
activates the scale widget and lets the user interact with the
widget.
o The parameter scale is a pointer to a non-NULL scale widget.
o If the actions parameter is passed with a non-NULL value,
the characters in the array will be injected into the wid-
get.
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 unknownFloat value (see the
cdk_objs.h header file).
The widget data exitType will be set to vESCAPE_HIT.
destroyCDKFScale
removes the widget from the screen and frees memory the object
used.
drawCDKFScale
draws the scale widget on the screen.
If the box parameter is true, the widget is drawn with a box.
eraseCDKFScale
removes the widget from the screen. This does NOT destroy the
widget.
getCDKFScaleBox
returns whether the widget will be drawn with a box around it.
getCDKFScaleDigits
returns the number of digits shown after the decimal point for
the box value.
getCDKFScaleHighValue
returns the high value of the scale widget.
getCDKFScaleLowValue
returns the low value of the scale widget.
getCDKFScaleValue
returns the current value of the widget.
injectCDKFScale
injects a single character into the widget.
o The parameter scale is a pointer to a non-NULL scale widget.
o The parameter character is the character to inject into the
widget.
The return value and side-effect (setting the widget data exit-
Type) 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 exit-
Type is set to vNORMAL.
ESCAPE the function returns the unknownFloat 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 unknownFloat value
(see the cdk_objs.h header file). The widget data exit-
Type is set to vEARLY_EXIT.
moveCDKFScale
moves the given widget to the given position.
o The parameters xpos and ypos are the new position of the
widget.
The parameter xpos may be an integer or one of the pre-de-
fined values TOP, BOTTOM, and CENTER.
The parameter ypos may be an integer or one of the pre-de-
fined values LEFT, RIGHT, and CENTER.
o 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.
newCDKFScale
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 val-
ues 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 val-
ues TOP, BOTTOM, and CENTER.
title
is the string to display at the top of the widget. The ti-
tle can be more than one line; just provide a carriage re-
turn 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 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 re-
turned.
positionCDKFScale
allows the user to move the widget around the screen via the
cursor/keypad keys. See cdk_position(3) for key bindings.
setCDKFScale
lets the programmer modify certain elements of an existing scale
widget.
The parameter names correspond to the same parameter names
listed in the newCDKFScale function.
setCDKFScaleBackgroundAttrib
sets the background attribute of the widget.
The parameter attribute is a curses attribute, e.g., A_BOLD.
setCDKFScaleBackgroundColor
sets the background color of the widget.
The parameter color is in the format of the Cdk format strings.
See cdk_display(3).
setCDKFScaleBox
sets whether the widget will be drawn with a box around it.
setCDKFScaleBoxAttribute
sets the attribute of the box.
setCDKFScaleDigits
sets the number of digits shown after the decimal point for the
box value.
setCDKFScaleHorizontalChar
sets the horizontal drawing character for the box to the given
character.
setCDKFScaleLLChar
sets the lower left hand corner of the widget's box to the given
character.
setCDKFScaleLRChar
sets the lower right hand corner of the widget's box to the
given character.
setCDKFScaleLowHigh
sets the low and high values of the widget.
setCDKFScalePostProcess
allows the user to have the widget call a function after the key
has been applied to the widget.
o The parameter function is the callback function.
o The parameter data points to data passed to the callback
function.
To learn more about post-processing see cdk_process(3).
setCDKFScalePreProcess
allows the user to have the widget call a function after a key
is hit and before the key is applied to the widget.
o The parameter function is the callback function.
o The parameter data points to data passed to the callback
function.
To learn more about pre-processing see cdk_process(3).
setCDKFScaleULChar
sets the upper left hand corner of the widget's box to the given
character.
setCDKFScaleURChar
sets the upper right hand corner of the widget's box to the
given character.
setCDKFScaleValue
sets the current value of the widget.
setCDKFScaleVerticalChar
sets the vertical drawing character for the box to the given
character.
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 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 se- |
| lected value. This also sets the widget data |
| exitType to vNORMAL. |
| Tab Exits the widget and returns the index of the se- |
| lected value. This also sets the widget data |
| exitType to vNORMAL. |
| Escape Exits the widget and returns the unknownFloat |
| 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. |
+----------------------------------------------------------------------+
cdk(3), cdk_binding(3), cdk_display(3), cdk_position(3),
cdk_screen(3)
2025-10-13 cdk_fscale(3)