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cdk_uscale(3) DragonFly Library Functions Manual cdk_uscale(3)
NAME
cdk_uscale - curses scale widget (type unsigned).
SYNOPSIS
cc [ flag ... ] file ... -lcdk [ library ... ]
#include <cdk.h>
unsigned activateCDKUScale (
CDKUSCALE *scale,
chtype *actions);
void destroyCDKUScale (
CDKUSCALE *scale);
void drawCDKUScale (
CDKUSCALE *scale,
boolean box);
void eraseCDKUScale (
CDKUSCALE *scale);
boolean getCDKUScaleBox (
CDKUSCALE *scale);
unsigned getCDKUScaleHighValue (
CDKUSCALE *scale);
unsigned getCDKUScaleLowValue (
CDKUSCALE *scale);
unsigned getCDKUScaleValue (
CDKUSCALE *scale);
int injectCDKUScale (
CDKUSCALE *scale,
chtype input);
void moveCDKUScale (
CDKUSCALE *scale,
int xpos,
int ypos,
boolean relative,
boolean refresh);
CDKUSCALE *newCDKUScale (
CDKSCREEN *cdkscreen,
int xpos,
int ypos,
const char *title,
const char *label,
chtype fieldAttribute,
int fieldWidth,
unsigned currentValue,
unsigned lowValue,
unsigned highValue,
unsigned increment,
unsigned fastIncrement,
boolean box,
boolean shadow);
void positionCDKUScale (
CDKUSCALE *scale);
void setCDKUScale (
CDKUSCALE *scale,
unsigned lowValue,
unsigned highValue,
unsigned currentValue,
boolean box);
void setCDKUScaleBackgroundAttrib (
CDKUSCALE *scale,
chtype attribute);
void setCDKUScaleBackgroundColor (
CDKUSCALE *scale,
const char * color);
void setCDKUScaleBox (
CDKUSCALE *scale,
boolean box);
void setCDKUScaleBoxAttribute (
CDKUSCALE *scale,
chtype character);
void setCDKUScaleHorizontalChar (
CDKUSCALE *scale,
chtype character);
void setCDKUScaleLLChar (
CDKUSCALE *scale,
chtype character);
void setCDKUScaleLRChar (
CDKUSCALE *scale,
chtype character);
void setCDKUScaleLowHigh (
CDKUSCALE *scale,
unsigned low,
unsigned high);
void setCDKUScalePostProcess (
CDKUSCALE *scale,
PROCESSFN callback,
void * data);
void setCDKUScalePreProcess (
CDKUSCALE *scale,
PROCESSFN callback,
void * data);
void setCDKUScaleULChar (
CDKUSCALE *scale,
chtype character);
void setCDKUScaleURChar (
CDKUSCALE *scale,
chtype character);
void setCDKUScaleValue (
CDKUSCALE *scale,
unsigned value);
void setCDKUScaleVerticalChar (
CDKUSCALE *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
activateCDKUScale
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 unknownUnsigned value (see the
cdk_objs.h header file). The widget data exitType will be set to
vESCAPE_HIT.
destroyCDKUScale
removes the widget from the screen and frees memory the object
used.
drawCDKUScale
draws the scale widget on the screen. If the box parameter is
true, the widget is drawn with a box.
eraseCDKUScale
removes the widget from the screen. This does NOT destroy the
widget.
getCDKUScaleBox
returns whether the widget will be drawn with a box around it.
getCDKUScaleHighValue
returns the high value of the scale widget.
getCDKUScaleLowValue
returns the low value of the scale widget.
getCDKUScaleValue
returns the current value of the widget.
injectCDKUScale
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 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.
moveCDKUScale
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.
newCDKUScale
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.
positionCDKUScale
allows the user to move the widget around the screen via the
cursor/keypad keys. See cdk_position (3) for key bindings.
setCDKUScale
lets the programmer modify certain elements of an existing scale
widget. The parameter names correspond to the same parameter
names listed in the newCDKUScale function.
setCDKUScaleBackgroundAttrib
sets the background attribute of the widget. The parameter
attribute is a curses attribute, e.g., A_BOLD.
setCDKUScaleBackgroundColor
sets the background color of the widget. The parameter color is
in the format of the Cdk format strings. See cdk_display (3).
setCDKUScaleBox
sets whether the widget will be drawn with a box around it.
setCDKUScaleBoxAttribute
sets the attribute of the box.
setCDKUScaleHorizontalChar
sets the horizontal drawing character for the box to the given
character.
setCDKUScaleLLChar
sets the lower left hand corner of the widget's box to the given
character.
setCDKUScaleLRChar
sets the lower right hand corner of the widget's box to the given
character.
setCDKUScaleLowHigh
sets the low and high values of the widget.
setCDKUScalePostProcess
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).
setCDKUScalePreProcess
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).
setCDKUScaleULChar
sets the upper left hand corner of the widget's box to the given
character.
setCDKUScaleURChar
sets the upper right hand corner of the widget's box to the given
character.
setCDKUScaleValue
sets the current value of the widget.
setCDKUScaleVerticalChar
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 scale by the normal value. |
|Up Arrow Increments the scale by the normal value. |
|u Increments the scale by the normal value. |
|Prev Page Decrements the scale by the accelerated value. |
|U Decrements the scale by the accelerated value. |
|Ctrl-B Decrements the scale by the accelerated value. |
|Next Page Increments the scale by the accelerated value. |
|Ctrl-F Increments the scale by the accelerated value. |
|Home Sets the scale to the low value. |
|g Sets the scale to the low value. |
|^ Sets the scale to the low value. |
|End Sets the scale to the high value. |
|G Sets the scale to the high value. |
|$ Sets the scale to the high value. |
|Return Exits the widget and returns the index of the |
| selected value. This also sets the widget data |
| exitType to vNORMAL. |
|Tab Exits the widget and returns the index of the |
| selected 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. |
+---------------------------------------------------------------------+
SEE ALSO
cdk(3), cdk_binding(3), cdk_display(3), cdk_position(3), cdk_screen(3)
cdk_uscale(3)