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cdk_uslider 3

cdk_uslider(3)                                                cdk_uslider(3)




NAME

       cdk_uslider - curses slider widget (type unsigned)


SYNOPSIS

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

       #include <cdk.h>

       int activateCDKUSlider (
                      CDKUSLIDER *slider,
                      chtype *actions);

       void destroyCDKUSlider (
                      CDKUSLIDER *slider);

       void drawCDKUSlider (
                      CDKUSLIDER *slider,
                      boolean box);

       void eraseCDKUSlider (
                      CDKUSLIDER *slider);

       boolean getCDKUSliderBox (
                      CDKUSLIDER *slider);

       unsigned getCDKUSliderHighValue (
                      CDKUSLIDER *slider);

       unsigned getCDKUSliderLowValue (
                      CDKUSLIDER *slider);

       unsigned getCDKUSliderValue (
                      CDKUSLIDER *slider);

       unsigned injectCDKUSlider (
                      CDKUSLIDER *slider,
                      chtype input);

       void moveCDKUSlider (
                      CDKUSLIDER *slider,
                      int xpos,
                      int ypos,
                      boolean relative,
                      boolean refresh);

       CDKUSLIDER *newCDKUSlider (
                      CDKSCREEN *cdkscreen,
                      int xpos,
                      int ypos,
                      const char *title,
                      const char *label,
                      chtype fillerCharacter,
                      int fieldWidth,
                      int currentValue,
                      unsigned lowValue,
                      unsigned highValue,
                      unsigned increment,
                      unsigned fastIncrement,
                      boolean box,
                      boolean shadow);

       void positionCDKUSlider (
                      CDKUSLIDER *slider);

       void setCDKUSlider (
                      CDKUSLIDER *slider,
                      unsigned lowValue,
                      unsigned highValue,
                      unsigned currentValue,
                      boolean box);

       void setCDKUSliderBackgroundAttrib (
                      CDKUSLIDER *slider,
                      chtype attribute);

       void setCDKUSliderBackgroundColor (
                      CDKUSLIDER *slider,
                      const char * color);

       void setCDKUSliderBox (
                      CDKUSLIDER *slider,
                      boolean boxWidget);

       void setCDKUSliderBoxAttribute (
                      CDKUSLIDER *slider,
                      chtype character);

       void setCDKUSliderHorizontalChar (
                      CDKUSLIDER *slider,
                      chtype character);

       void setCDKUSliderLLChar (
                      CDKUSLIDER *slider,
                      chtype character);

       void setCDKUSliderLRChar (
                      CDKUSLIDER *slider,
                      chtype character);

       void setCDKUSliderLowHigh (
                      CDKUSLIDER *slider,
                      unsigned lowValue,
                      unsigned highValue);

       void setCDKUSliderPostProcess (
                      CDKUSLIDER *slider,
                      PROCESSFN callback,
                      void * data);

       void setCDKUSliderPreProcess (
                      CDKUSLIDER *slider,
                      PROCESSFN callback,
                      void * data);

       void setCDKUSliderULChar (
                      CDKUSLIDER *slider,
                      chtype character);

       void setCDKUSliderURChar (
                      CDKUSLIDER *slider,
                      chtype character);

       void setCDKUSliderValue (
                      CDKUSLIDER *slider,
                      unsigned value);

       void setCDKUSliderVerticalChar (
                      CDKUSLIDER *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

       activateCDKUSlider
            activates  the slider widget and lets the user interact with the
            widget.

            o   The parameter slider is a pointer to a non-NULL slider  wid-
                get.

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

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

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

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

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

       getCDKUSliderHighValue
            returns the high value of the slider widget.

       getCDKUSliderLowValue
            returns the low value of the slider widget.

       getCDKUSliderValue
            returns the current value of the widget.

       injectCDKUSlider
            injects a single character into the widget.

            o   The  parameter slider is a pointer to a non-NULL slider wid-
                get.

            o   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 unknownUnsigned  value  (see
                       the  cdk_objs.h  header file).  The widget data exit-
                       Type is set to vESCAPE_HIT.

            Otherwise unless modified by  preprocessing,  postprocessing  or
            key  bindings,  the  function  returns the unknownUnsigned value
            (see the cdk_objs.h header file).  The widget data  exitType  is
            set to vEARLY_EXIT.

       moveCDKUSlider
            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-
                defined values TOP, BOTTOM, and CENTER.

                The  parameter  ypos  may  be  an integer or one of the pre-
                defined 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).

            o   The  final parameter refresh is a boolean value which states
                whether the widget will get refreshed after the move.

       newCDKUSlider
            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  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
                 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 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
            returned.

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

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

       setCDKUSliderBackgroundAttrib
            sets the background attribute of the widget.

            The parameter attribute is a curses attribute, e.g., A_BOLD.

       setCDKUSliderBackgroundColor
            sets the background color of the widget.

            The parameter color is in the format of the Cdk format strings.

            See cdk_display(3).

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

       setCDKUSliderBoxAttribute
            function sets the attribute of the box.

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

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

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

       setCDKUSliderLowHigh
            sets the low and high values of the widget.

       setCDKUSliderPostProcess
            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).

       setCDKUSliderPreProcess
            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).

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

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

       setCDKUSliderValue
            sets the current value of the widget.

       setCDKUSliderVerticalChar
            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 wid-
       get.

       +---------------------------------------------------------------------+
       |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 vNOR- |
       |                  MAL.                                               |
       |Tab               Exits the widget and returns  the  current  value. |
       |                  This  also  sets the widget data exitType to vNOR- |
       |                  MAL.                                               |
       |Escape            Exits the widget and returns  the  unknownUnsigned |
       |                  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_uslider(3)