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Man Pages


Manual Reference Pages  -  ACTIVATECDKFSCALE (3)

NAME

cdk_fscale - curses scale widget (type float).

CONTENTS

Synopsis
Description
Available Functions
Key Bindings
See Also

SYNOPSIS

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);

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

activateCDKFScale
  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 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. 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 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 exitType is set to vEARLY_EXIT.
moveCDKFScale
  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.
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 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.
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. 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).
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. 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).
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.

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.

KeyAction
Down ArrowDecrements the scale by the normal value.
Up ArrowIncrements the scale by the normal value.
uIncrements the scale by the normal value.
Prev PageDecrements the scale by the accelerated value.
UDecrements the scale by the accelerated value.
Ctrl-BDecrements the scale by the accelerated value.
Next PageIncrements the scale by the accelerated value.
Ctrl-FIncrements the scale by the accelerated value.
HomeSets the scale to the low value.
gSets the scale to the low value.
^Sets the scale to the low value.
EndSets the scale to the high value.
GSets the scale to the high value.
$Sets the scale to the high value.
ReturnExits the widget and returns the index of the selected value. This also sets the widget data exitType to vNORMAL.
TabExits the widget and returns the index of the selected value. This also sets the widget data exitType to vNORMAL.
EscapeExits 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-RRefreshes 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.

KeyAction
Left ArrowDecrements the scale by the normal value.
Right ArrowIncrements the scale by the normal value.
dDecrements the scale by the normal value.
DIncrements the scale by the accelerated value.
-Decrements the scale by the normal value.
+Increments the scale by the normal value.
0Sets the scale to the low value.

SEE ALSO

cdk(3), cdk_binding(3), cdk_display(3), cdk_position(3), cdk_screen(3)
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