cdk_uslider - curses slider widget (type unsigned)
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);
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.
- activateCDKUSlider
- 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 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.
- •
- 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 unknownUnsigned 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 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.
- •
- 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.
- 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 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.
- 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.
- •
- 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).
- 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.
- •
- 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).
- 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.
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 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. |
cdk(3),
cdk_binding(3),
cdk_display(3),
cdk_position(3),
cdk_screen(3)