cdk_scroll - curses scrolling list widget.
cc [
flag ... ]
file ...
-lcdk [
library ...
]
#include <cdk.h>
- int activateCDKScroll (
-
CDKSCROLL *scroll,
chtype * actions);
- void addCDKScrollItem (
-
CDKSCROLL *scroll,
const char *item);
- void deleteCDKScrollItem (
-
CDKSCROLL *scroll,
int position);
- void destroyCDKScroll (
-
CDKSCROLL *scroll);
- void drawCDKScroll (
-
CDKSCROLL *scroll,
boolean box);
- void eraseCDKScroll (
-
CDKSCROLL *scroll);
- boolean getCDKScrollBox (
-
CDKSCROLL *scroll);
- int getCDKScrollCurrent(
-
CDKSCROLL *scroll);
- int getCDKScrollCurrentItem (
-
CDKSCROLL *widget);
- chtype getCDKScrollHighlight (
-
CDKSCROLL *scroll,
chtype highlight);
- int getCDKScrollCurrentTop (
-
CDKSCROLL *widget);
- int getCDKScrollItems (
-
CDKSCROLL *scroll,
char **itemList);
- int injectCDKScroll (
-
CDKSCROLL *scroll,
chtype input);
- void insertCDKScrollItem (
-
CDKSCROLL *scroll,
const char *item);
- void moveCDKScroll (
-
CDKSCROLL *scroll,
int xpos,
int ypos,
boolean relative,
boolean refresh);
- CDKSCROLL *newCDKScroll (
-
CDKSCREEN *cdkscreen,
int xpos,
int ypos,
int spos,
int height,
int width,
const char *title,
CDK_CONST char **itemList,
int items,
boolean numbers,
chtype highlight,
boolean box,
boolean shadow);
- void positionCDKScroll (
-
CDKSCROLL *scroll);
- void setCDKScroll (
-
CDKSCROLL *scroll,
CDK_CONST char **itemList,
int items,
boolean numbers,
chtype highlight,
boolean box);
- void setCDKScrollBackgroundAttrib (
-
CDKSCROLL *scroll,
chtype attribute);
- void setCDKScrollBackgroundColor (
-
CDKSCROLL *scroll,
const char * color);
- void setCDKScrollBox (
-
CDKSCROLL *scroll,
boolean box);
- void setCDKScrollBoxAttribute (
-
CDKSCROLL *scroll,
chtype character);
- void setCDKScrollCurrent(
-
CDKSCROLL *scroll,
intitem);
- void setCDKScrollCurrentItem (
-
CDKSCROLL *widget,
intitem);
- int getCDKScrollCurrentTop (
-
CDKSCROLL *widget);
- void setCDKScrollHighlight (
-
CDKSCROLL *scroll,
chtype highlight);
- void setCDKScrollHorizontalChar (
-
CDKSCROLL *scroll,
chtype character);
- void setCDKScrollItems (
-
CDKSCROLL *scroll,
CDK_CONST char **itemList,
int listSize,
boolean numbers);
- void setCDKScrollLLChar (
-
CDKSCROLL *scroll,
chtype character);
- void setCDKScrollLRChar (
-
CDKSCROLL *scroll,
chtype character);
- void setCDKScrollPosition (
-
CDKSCROLL *scroll,
intitem);
- void setCDKScrollPostProcess (
-
CDKSCROLL *scroll,
PROCESSFN callback,
void * data);
- void setCDKScrollPreProcess (
-
CDKSCROLL *scroll,
PROCESSFN callback,
void * data);
- void setCDKScrollULChar (
-
CDKSCROLL *scroll,
chtype character);
- void setCDKScrollURChar (
-
CDKSCROLL *scroll,
chtype character);
- void setCDKScrollVerticalChar (
-
CDKSCROLL *scroll,
chtype character);
The Cdk scroll widget creates a scrolling list. The following are functions
which create or manipulate the Cdk scrolling list widget.
- activateCDKScroll
- activates the scroll widget and lets the user interact with
the widget.
- •
- The parameter scroll points to a non-NULL scroll
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 0 to the number
of items-1, representing the item selected. It will also set the widget
data exitType to vNORMAL.
- If the character entered into this widget was ESCAPE
then the widget will return a value of -1 and the widget data
exitType will be set to vESCAPE_HIT.
- addCDKScrollItem
- allows the user to add an item into an existing scrolling
list.
- •
- The scroll parameter points to the scrolling list to
add the item to.
- •
- The parameter item is a char * representing
the new item to add. The item is always added to the end of the list.
- deleteCDKScrollItem
- allows the user to add an item into an existing scrolling
list.
- •
- The scroll parameter points to the scrolling list to
add the item to.
- •
- The parameter f2position is an int which
specifies which element to remove.
- destroyCDKScroll
- removes the widget from the screen and frees memory the
object used.
- drawCDKScroll
- draws the scroll widget on the screen. If the box
option is true, the widget is drawn with a box.
- eraseCDKScroll
- removes the widget from the screen. This does NOT
destroy the widget.
- getCDKScrollBox
- returns true if the widget will be drawn with a box around
it.
- getCDKScrollCurrent
- returns the current item's index.
- getCDKScrollCurrentItem
- returns the current item number in the scroller.
- getCDKScrollHighlight
- returns the attribute of the highlight bar.
- getCDKScrollCurrentTop
- returns the top line of the scroller, counting from
zero.
- getCDKScrollItems
- fills the parameter itemList with the contents of
the scrolling list. It returns the number of elements in the scrolling
list.
- injectCDKScroll
- injects a single character into the widget.
- •
- The parameter scroll points to a non-NULL scroll
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 zero to one less
than the number of items, representing the item selected. The widget data
exitType is set to vNORMAL.
- ESCAPE
- the function returns -1. The widget data exitType is
set to vESCAPE_HIT.
- Otherwise
- unless modified by preprocessing, postprocessing or key
bindings, the function returns -1. The widget data exitType is set
to vEARLY_EXIT.
- insertCDKScrollItem
- allows the user to add an item into an existing scrolling
list.
- •
- The scroll parameter points to the scrolling list to
add the item to.
- •
- The parameter item is a char * representing
the new item to add.
- The item is always added before the current item in the
list.
- moveCDKScroll
- 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.
- newCDKScroll
- creates a scroll widget and returns a pointer to it.
Parameters:
- •
- 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 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. This parameter may be an integer value or one of the
pre-defined values TOP, BOTTOM, and CENTER.
- •
-
spos is where the scroll bar is to be placed. This
may be one of three values:
-
LEFT,
- which puts the scroll bar on the left of the scrolling
list.
- RIGHT
- which puts the scroll bar on the right side of the list,
and
-
NONE which does not add a scroll bar.
- •
-
height and width control the height and width
of the widget.
- If you provide a value of zero for either of the height or
the width, the widget will be created with the full width and height of
the screen. If you provide a negative value, the widget will be created
the full height or width minus the value provided.
- •
-
title is the string which will be displayed at the
top of the widget. The title can be more than one line; just provide a
carriage return character at the line break.
- •
-
itemList is the list of items to be displayed in the
scrolling list.
- •
-
items is the number of elements in the given
list.
- •
-
numbers is true if you want the items in the list to
have a number attached to the front of the list items.
- •
-
highlight specifies the display attribute of the
currently selected item.
- •
-
box is true if the widget should be drawn with a box
around it.
- •
-
shadow is true to turn the shadow on around this
widget.
- If the widget could not be created then a NULL
pointer is returned.
- positionCDKScroll
- allows the user to move the widget around the screen via
the cursor/keypad keys. See cdk_position (3) for key bindings.
- setCDKScroll
- lets the programmer modify certain elements of an existing
scroll widget.
- The parameter names correspond to the same parameter names
listed in the newCDKScroll function.
- setCDKScrollBackgroundAttrib
- sets the background attribute of the widget.
- The parameter attribute is a curses attribute, e.g.,
A_BOLD.
- setCDKScrollBackgroundColor
- sets the background color of the widget.
- The parameter color is in the format of the Cdk
format strings.
- See cdk_display (3).
- setCDKScrollBox
- sets whether the widget will be drawn with a box around
it.
- setCDKScrollBoxAttribute
- sets the attribute of the box.
- setCDKScrollCurrent
- sets the index for the current item.
- setCDKScrollCurrentItem
- set the current item number in the scroller.
- setCDKScrollCurrentTop
- set the top line number of the scroller.
- setCDKScrollHighlight
- sets the attribute of the highlight bar.
- setCDKScrollHorizontalChar
- sets the horizontal drawing character for the box to the
given character.
- setCDKScrollItems
- sets the contents of the scrolling list.
- setCDKScrollLLChar
- sets the lower left hand corner of the widget's box to the
given character.
- setCDKScrollLRChar
- sets the lower right hand corner of the widget's box to the
given character.
- setCDKScrollPosition
- sets the current item in the widget to the given
position.
- setCDKScrollPostProcess
- 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).
- setCDKScrollPreProcess
- 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).
- setCDKScrollULChar
- sets the upper left hand corner of the widget's box to the
given character.
- setCDKScrollURChar
- sets the upper right hand corner of the widget's box to the
given character.
- setCDKScrollVerticalChar
- 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 |
|
Left Arrow |
Shift the list left one column. |
Right Arrow |
Shift the list right one column. |
Up Arrow |
Select the previous item in the list. |
Down Arrow |
Select the next item in the list. |
|
Prev Page |
|
Ctrl-B |
Scroll one page backward. |
Next Page |
|
Ctrl-F |
Scroll one page forward. |
|
1 |
|
< |
|
g |
|
Home |
Move to the first element in the list. |
|
> |
|
G |
|
End |
Move to the last element in the list. |
|
$ |
Shift the list to the far right. |
| |
Shift the list to the far left. |
|
Return |
Exit the widget and return the index of the selected item. Also set the
widget data exitType to vNORMAL. |
Tab |
Exit the widget and return the index of the selected item. Also set the
widget data exitType to vNORMAL. |
Escape |
Exit the widget and return -1. Also set the widget data exitType
to vESCAPE_HIT. |
Ctrl-L |
Refreshes the screen. |
cdk(3),
cdk_binding(3),
cdk_display(3),
cdk_position(3),
cdk_screen(3)