cdk_slider(3)cdk_slider(3)NAME
newCDKSlider, activateCDKSlider, injectCDKSlider, setCD
KSlider, setCDKSliderLowHigh, getCDKSliderLowValue, getCD
KSliderHighValue, setCDKSliderBox, getCDKSliderBox, setCD
KSliderULChar, setCDKSliderURChar, setCDKSliderLLChar,
setCDKSliderLRChar, setCDKSliderVerticalChar, setCDKSlid
erHorizontalChar, setCDKSliderBoxAttribute, setCDKSlider
BackgroundColor, drawCDKSlider, eraseCDKSlider, destroyCD
KSlider, setCDKSliderPreProcess, setCDKSliderPostProcess
- Creates a managed curses slider widget.
SYNOPSIS
cc [ flag ... ] file ... -lcdk [ library ... ]
#include <cdk.h>
CDKSLIDER *newCDKSlider (CDKSCREEN *cdkscreen, int xpos,
int ypos, char *title, char *label, chtype fillerCharac_
ter, int fieldWidth, int currentValue, int lowValue, int
highValue, int increment, int fastIncrement, boolean box,
boolean shadow);
int activateCDKSlider (CDKSLIDER *slider, chtype
*actions);
int injectCDKSlider (CDKSLIDER *slider, chtype input);
void setCDKSlider (CDKSLIDER *slider, int lowValue, int
highValue, int currentValue, boolean box);
void setCDKSliderLowHigh (CDKSLIDER *slider, int lowValue,
int highValue);
int getCDKSliderLowValue ((CDKSLIDER *slider);
int getCDKSliderHighValue ((CDKSLIDER *slider);
void setCDKSliderValue ((CDKSLIDER *slider, int value);
int getCDKSliderValue ((CDKSLIDER *slider);
void setCDKSliderULChar (CDKSLIDER *,slider, chtype char_
acter);
void setCDKSliderURChar (CDKSLIDER *,slider, chtype char_
acter);
void setCDKSliderLLChar (CDKSLIDER *,slider, chtype char_
acter);
void setCDKSliderLRChar (CDKSLIDER *,slider, chtype char_
acter);
void setCDKSliderVerticalChar (CDKSLIDER *,slider, chtype
character);
void setCDKSliderHorizontalChar (CDKSLIDER *,slider,
chtype character);
void setCDKSliderBoxAttribute (CDKSLIDER *,slider, chtype
character);
void setCDKSliderBackgroundColor (CDKSLIDER *,slider, char
* color);
void moveCDKSlider (CDKSLIDER *slider, int box, int box,
boolean relative, boolean refresh);
void positionCDKSlider (CDKSLIDER *slider);
void drawCDKSlider (CDKSLIDER *slider, boolean box);
void eraseCDKSlider (CDKSLIDER *slider);
void destroyCDKSlider (CDKSLIDER *slider);
void setCDKSliderPreProcess (CDKSLIDER *slider, PROCESSFN
callback, void * data);
void setCDKSliderPostProcess (CDKSLIDER *slider, PROCESSFN
callback, void * data);
void bindCDKObject (EObjectType widgetType, void *object,
chtype key, BINDFN function, void *data);
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
CDKSLIDER *newCDKSlider (CDKSCREEN *screen, int xpos, int
ypos, char *title, char *label, chtype fillerCharacter,
chtype fillerCharacter, EDisplayType displayType, int
fieldWidth, int minimumLength, int maximumLength, boolean
box, boolean shadow);
This function creates a pointer to a slider widget. The
screen parameter is the screen you wish this widget to
be placed in. The parameter xpos controls the placement
of the object along the horizontal axis. This parameter
can accept an integer value or one of the pre-defined
values of LEFT, RIGHT, and CENTER. The parameter ypos
controls the placement of the object along the vertical
axis. This parameter can accept an integer value or one
of the pre-defined values of TOP, BOTTOM, and CENTER.
The title parameter is the string which will be dis
played at the top of the widget. The title can be more
than one line; just provide a carriage return character
at the line break. The label parameter is the string
which will be displayed in the label of the slider
field. The fillerCharacter is the character to be used
to draw the slider bar in the field. The parameter
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. The parameter currentValue is the
value of the slider field when the widget is activated.
The parameters lowValue and highValue are the low and
high values of the widget respectively. The parameter
increment is the regular increment value while fastIn_
crement is the accelerated increment value. The box
parameter states whether the widget will be drawn with
a box around it or not. The shadow parameter accepts a
boolean value to turn the shadow on or off around this
widget. If the widget could not be created then a NULL
pointer is returned.
int activateCDKSlider (CDKSLIDER *slider, chtype
*actions);
This function 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 charac
ters 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 structure member exitType to vNORMAL. If
the character entered into this widget was ESCAPE then
the widget will return a value of -1 and the structure
member exitType will be set to vESCAPE_HIT.
int injectCDKSlider (CDKSLIDER *slider, chtype character);
This function injects a single character into the wid
get. The parameter slider is a pointer to a non-NULL
slider widget. The parameter character is the character
to inject into the widget. If the character injected
into this widget was RETURN then the character injected
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 structure member exitType
to vNORMAL. If the character entered into this widget
was ESCAPE then the widget will return a value of -1
and the structure member exitType will be set to
vESCAPE_HIT. Any other character injected into the wid
get will set the structure member exitType to
vEARLY_EXIT and the function will return -1.
void setCDKSlider (CDKSLIDER *slider, int value, int mini_
mumLength, int maximumLength, boolean box);
This function lets the programmer modify certain ele
ments of an already defined slider widget. The parame
ter names correspond to the same parameter names listed
in the newCDKSlider function.
void setCDKSliderLowHigh (CDKSLIDER *slider, int lowValue,
int highValue);
This sets the low and high values of the widget.
int getCDKSliderLowValue (CDKSLIDER *slider);
This returns the low value of the slider widget.
int getCDKSliderHighValue (CDKSLIDER *slider);
This returns the high value of the slider widget.
void setCDKSliderValue (CDKSLIDER *slider, int value);
This sets the current value of the widget.
int getCDKSliderValue (CDKSLIDER *slider);
This returns the current value of the widget.
void setCDKSliderBox (CDKSLIDER *slider, boolean boxWid_
get);
This sets whether or not the widget will be draw with a
box around it.
boolean getCDKSliderBox (CDKSLIDER *slider);
This returns whether or not the widget will be drawn
with a box around it.
void setCDKSliderULChar (CDKSLIDER *slider, chtype
character);
This function sets the upper left hand corner of the
widgets box to the given character.
void setCDKSliderURChar (CDKSLIDER *slider, chtype charac_
ter);
This function sets the upper right hand corner of the
widgets box to the given character.
void setCDKSliderLLChar (CDKSLIDER *slider, chtype charac_
ter);
This function sets the lower left hand corner of the
widgets box to the given character.
void setCDKSliderLRChar (CDKSLIDER *slider, chtype charac_
ter);
This function sets the lower right hand corner of the
widgets box to the given character.
void setCDKSliderVerticalChar (CDKSLIDER *slider, chtype
character);
This function sets the vertical drawing character for
the box to the given character.
void setCDKSliderHorizontalChar (CDKSLIDER *slider, chtype
character);
This function sets the horizontal drawing character for
the box to the given character.
void setCDKSliderBoxAttribute (CDKSLIDER *slider, chtype
attribute);
This function sets the attribute of the box.
void setCDKSliderBackgroundColor (CDKSLIDER *slider, char
*color);
This sets the background color of the widget. The
parameter color is in the format of the Cdk format
strings. To get more information look at the cdk_dis_
play manual page.
void moveCDKSlider (CDKSLIDER *slider, int xpos, int ypos,
boolean relative, boolean refresh);
This function moves the given widget to the given posi
tion. The parameters xpos and ypos is the new position
of the widget. The parameter xpos can accept an integer
value or one of the pre-defined values of TOP, BOTTOM,
and CENTER. The parameter ypos can accept an integer
value or one of the pre-defined values of 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 of TOP, BOTTOM, LEFT, RIGHT, or CENTER when
relative = TRUE. (wierd things may happen). The final
parameter refresh is a boolean value which states
whether the widget will get refreshed after the move or
not.
void positionCDKSlider (CDKSLIDER *slider);
This function allows the user to move the widget around
the screen via the cursor/keypad keys. The following
key bindings can be used to move the widget around the
screen.
Key Bindings
Key Action
Up Arrow Moves the widget up one line.
Down Arrow Moves the widget down one line.
Left Arrow Moves the widget left one column
Right Arrow Moves the widget right one column
Keypad-1 Moves the widget down one line
and left one column.
Keypad-2 Moves the widget down one line.
Keypad-3 Moves the widget down one line
and right one column.
Keypad-4 Moves the widget left one column
Keypad-5 Centers the widget both vertically
and horizontally.
Keypad-6 Moves the widget right one column
Keypad-7 Moves the widget up one line
and left one column.
Keypad-8 Moves the widget up one line.
Keypad-9 Moves the widget up one line
and right one column.
t Moves the widget to the top of the screen.
b Moves the widget to the bottom of the screen.
l Moves the widget to the left of the screen.
r Moves the widget to the right of the screen.
c Centers the widget between the left and
right of the window.
C Centers the widget between the top and
bottom of the window.
Escape Returns the widget to it's original position.
Return Exits the function and leaves the widget
where it was.
Keypad means that if the keyboard you are using has
a keypad, then the Num-Lock light has to be on in
order to use the keys as listed. (The numeric keys
at the top of the keyboard will work as well.)
void drawCDKSlider (CDKSLIDER *slider, boolean box);
This function draws the slider widget on the
screen. The box option draws the widget with or
without a box.
void eraseCDKSlider (CDKSLIDER *slider);
This function removes the widget from the screen.
This does NOT destroy the widget.
void destroyCDKSlider (CDKSLIDER *slider);
This function removes the widget from the screen
and frees up any memory the object may be using.
void setCDKSliderPreProcess (CDKSLIDER *slider, PRO
CESSFN function, void *data);
This function 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 func_
tion if of type PROCESSFN. The parameter data is
a pointer to void. To learn more about pre-pro
cessing read the cdk_process manual page.
void setCDKSliderPostProcess (CDKSLIDER *slider,
PROCESSFN function, void *data);
This function allows the user to have the widget
call a function after the key has been applied to
the widget. The parameter function if of type
PROCESSFN. The parameter data is a pointer to
void. To learn more about post-processing read
the cdk_process manual page.
void bindCDKObject (EObjectType widgetType, void
*object, char key, BINDFN function, void *data);
This function allows the user to create special
key bindings. The widgetType parameter is a
defined type which states what Cdk object type is
being used. To learn more about the type EOb_
jectType read the cdk_binding manual page. The
object parameter is the pointer to the widget
object. The key is the character to bind. The
function is the function type. To learn more
about the key binding callback function types
read the cdk_binding manual page. The last param
eter data is a pointer to any data that needs to
get passed to the callback function.
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
Left Arrow Decrements the value in the field
by the normal decrement value.
Down Arrow Decrements the value in the field
by the normal decrement value.
d Decrements the value in the field
by the normal decrement value.
- Decrements the value in the field
by the normal decrement value.
Right Arrow Increments the value in the field
by the normal increment value.
Up Arrow Increments the value in the field
by the normal increment value.
u Increments the value in the field
by the normal increment value.
+ Increments the value in the field
by the normal increment value.
Prev Page Decrements the value in the field
by the accelerated decrement value.
U Decrements the value in the field
by the accelerated decrement value.
Ctrl-B Decrements the value in the field
by the accelerated decrement value.
Next Page Increments the value in the field
by the accelerated increment value.
D Increments the value in the field
by the accelerated increment value.
Ctrl-F Increments the value in the field
by the accelerated increment value.
Home Sets the value to the low value.
g Sets the value to the low value.
0 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 an
integer value representing the
current value. This also sets the
structure member exitType in
the widget pointer to the value of
vNORMAL.
Tab Exits the widget and returns an
integer value representing the
current value. This also sets the
structure member exitType in
the widget pointer to the value of
vNORMAL.
Escape Exits the widget and returns -1.
This also sets the structure member
exitType in the widget pointer
to the value of vESCAPE_HIT.
Ctrl-R Refreshes the screen.
SEE ALSOcdk(3), cdk_binding(3), cdk_display(3), cdk_screen(3)NOTES
The header file <cdk.h> automatically includes the header
files <curses.h>, <stdlib.h>, <string.h>, <ctype.h>,
<unistd.h>, <dirent.h>, <time.h>, <errno.h>, <pwd.h>,
<grp.h>, <sys/stat.h>, and <sys/types.h>. The <curses.h>
header file includes <stdio.h> and <unctrl.h>.
If you have Ncurses installed on your machine add
-DNCURSES to the compile line to include the Ncurses
header files instead.
18 March 1997 cdk_slider(3)
