cdk_fslider(3)

NAME
cdk_fslider - curses slider widget (type float)

SYNOPSIS

cc [ flag ... ] file ... -lcdk [ library ... ]

#include <cdk.h>

int activateCDKFSlider (
    CDKFSLIDER *slider,
    chtype *actions);

void destroyCDKFSlider (
    CDKFSLIDER *slider);

void drawCDKFSlider (
    CDKFSLIDER *slider,
    boolean box);

void eraseCDKFSlider (
    CDKFSLIDER *slider);

boolean getCDKFSliderBox (
    CDKFSLIDER *slider);

int getCDKFSliderDigits (
    CDKFSLIDER *scale);

float getCDKFSliderHighValue (
    CDKFSLIDER *slider);

float getCDKFSliderLowValue (
    CDKFSLIDER *slider);

float getCDKFSliderValue (
    CDKFSLIDER *slider);

float injectCDKFSlider (
    CDKFSLIDER *slider,
    chtype input);

void moveCDKFSlider (
    CDKFSLIDER *slider,
    int xpos,
    int ypos,
    boolean relative,
    boolean refresh);

CDKFSLIDER *newCDKFSlider (
    CDKSCREEN *cdkscreen,
    int xpos,
    int ypos,
    const char *title,
    const char *label,
    chtype fillerCharacter,
    int fieldWidth,
    int currentValue,
    float lowValue,
    float highValue,
    float increment,
    float fastIncrement,
    int digits,
    boolean box,
    boolean shadow);

void positionCDKFSlider (
    CDKFSLIDER *slider);

void setCDKFSlider (
    CDKFSLIDER *slider,
    float lowValue,
    float highValue,
    float currentValue,
    boolean box);

void setCDKFSliderBackgroundAttrib (
    CDKFSLIDER *slider,
    chtype attribute);

void setCDKFSliderBackgroundColor (
    CDKFSLIDER *slider,
    const char * color);

void setCDKFSliderBox (
    CDKFSLIDER *slider,
    boolean boxWidget);

void setCDKFSliderBoxAttribute (
    CDKFSLIDER *slider,
    chtype character);

void setCDKFSliderDigits (
    CDKFSLIDER *scale,
    int digits);

void setCDKFSliderHorizontalChar (
    CDKFSLIDER *slider,
    chtype character);

void setCDKFSliderLLChar (
    CDKFSLIDER *slider,
    chtype character);

void setCDKFSliderLRChar (
    CDKFSLIDER *slider,
    chtype character);

void setCDKFSliderLowHigh (
    CDKFSLIDER *slider,
    float lowValue,
    float highValue);

void setCDKFSliderPostProcess (
    CDKFSLIDER *slider,
    PROCESSFN callback,
    void * data);

void setCDKFSliderPreProcess (
    CDKFSLIDER *slider,
    PROCESSFN callback,
    void * data);

void setCDKFSliderULChar (
    CDKFSLIDER *slider,
    chtype character);

void setCDKFSliderURChar (
    CDKFSLIDER *slider,
    chtype character);

void setCDKFSliderValue (
    CDKFSLIDER *slider,
    float value);

void setCDKFSliderVerticalChar (
    CDKFSLIDER *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

activateCDKFSlider
    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 unknownFloat value (see the cdk_objs.h header file). The widget data exitType is set to vESCAPE_HIT.

destroyCDKFSlider
    removes the widget from the screen and frees memory the object used.

drawCDKFSlider
    draws the slider widget on the screen. If the box option is true, the widget is drawn with a box.

eraseCDKFSlider
    removes the widget from the screen. This does NOT destroy the widget.

getCDKFSliderBox
    returns true if the widget will be drawn with a box around it.

getCDKFSliderDigits
    returns the number of digits shown after the decimal point for the box value.

getCDKFSliderHighValue
    returns the high value of the slider widget.

getCDKFSliderLowValue
    returns the low value of the slider widget.

getCDKFSliderValue
    returns the current value of the widget.

injectCDKFSlider
    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 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.

moveCDKFSlider
    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.

newCDKFSlider
    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.

positionCDKFSlider
    allows the user to move the widget around the screen via the cursor/keypad keys. See cdk_position (3) for key bindings.

setCDKFSlider
    lets the programmer modify certain elements of an existing slider widget. The parameter names correspond to the same parameter names listed in the newCDKFSlider function.

setCDKFSliderBackgroundAttrib
    sets the background attribute of the widget. The parameter attribute is a curses attribute, e.g., A_BOLD.

setCDKFSliderBackgroundColor
    sets the background color of the widget. The parameter color is in the format of the Cdk format strings. See cdk_display (3).

setCDKFSliderBox
    sets whether the widget will be drawn with a box around it.

setCDKFSliderBoxAttribute
    function sets the attribute of the box.

setCDKFSliderDigits
    sets the number of digits shown after the decimal point for the box value.

setCDKFSliderHorizontalChar
    sets the horizontal drawing character for the box to the given character.

setCDKFSliderLLChar
    sets the lower left hand corner of the widget's box to the given character.

setCDKFSliderLRChar
    sets the lower right hand corner of the widget's box to the given character.

setCDKFSliderLowHigh
    sets the low and high values of the widget.

setCDKFSliderPostProcess
    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).

setCDKFSliderPreProcess
    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).

setCDKFSliderULChar
    sets the upper left hand corner of the widget's box to the given character.

setCDKFSliderURChar
    sets the upper right hand corner of the widget's box to the given character.

setCDKFSliderValue
    sets the current value of the widget.

setCDKFSliderVerticalChar
    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 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.

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