NetBSD/dist/cdk/scroll.c

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C
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#include <cdk.h>
/*
* $Author: agc $
* $Date: 2003/08/28 11:32:33 $
* $Revision: 1.4 $
*/
/*
* Declare file local prototypes.
*/
static void drawCDKScrollList (CDKSCROLL *scrollp);
static void createCDKScrollItemList (CDKSCROLL *scrollp, boolean numbers,
char **list, int listSize);
DeclareCDKObjects(my_funcs,Scroll);
/*
* This function creates a new scrolling list widget.
*/
CDKSCROLL *newCDKScroll (CDKSCREEN *cdkscreen, int xplace, int yplace, int splace, int height, int width, char *title, char **list, int listSize, boolean numbers, chtype highlight, boolean Box, boolean shadow)
{
/* Declare local variables. */
CDKSCROLL *scrollp = newCDKObject(CDKSCROLL, &my_funcs);
chtype *holder = 0;
int parentWidth = getmaxx(cdkscreen->window);
int parentHeight = getmaxy(cdkscreen->window);
int boxWidth = width;
int boxHeight = height;
int maxWidth = INT_MIN;
int xpos = xplace;
int ypos = yplace;
char **temp = 0;
int x, len, junk2;
if ((splace == LEFT) || (splace == RIGHT))
{
scrollp->scrollbar = TRUE;
}
else
{
scrollp->scrollbar = FALSE;
}
/*
* If the height is a negative value, the height will
* be ROWS-height, otherwise, the height will be the
* given height.
*/
boxHeight = setWidgetDimension (parentHeight, height, 0);
/*
* If the width is a negative value, the width will
* be COLS-width, otherwise, the width will be the
* given width.
*/
boxWidth = setWidgetDimension (parentWidth, width, 0);
/* Translate the char * items to chtype * */
if (title != 0)
{
temp = CDKsplitString (title, '\n');
scrollp->titleLines = CDKcountStrings (temp);
/* We need to determine the widest title line. */
for (x=0; x < scrollp->titleLines; x++)
{
holder = char2Chtype (temp[x], &len, &junk2);
maxWidth = MAXIMUM (maxWidth, len);
freeChtype (holder);
}
boxWidth = MAXIMUM (boxWidth, maxWidth + 2);
/* For each line in the title, convert from char * to chtype * */
for (x=0; x < scrollp->titleLines; x++)
{
scrollp->title[x] = char2Chtype (temp[x],
&scrollp->titleLen[x],
&scrollp->titlePos[x]);
scrollp->titlePos[x] = justifyString (boxWidth - 2,
scrollp->titleLen[x],
scrollp->titlePos[x]);
}
CDKfreeStrings(temp);
}
else
{
/* No title? Set the required variables. */
scrollp->titleLines = 0;
}
/* Set the box height. */
if (scrollp->titleLines > boxHeight)
{
if (listSize > 8)
{
boxHeight = scrollp->titleLines + 10;
}
else
{
boxHeight = scrollp->titleLines + listSize + 2;
}
}
scrollp->fieldWidth = boxWidth - 2 - scrollp->scrollbar;
scrollp->viewSize = boxHeight - 2 - scrollp->titleLines;
/*
* Make sure we didn't extend beyond the dimensions of the window.
*/
boxWidth = MINIMUM (boxWidth, parentWidth);
boxHeight = MINIMUM (boxHeight, parentHeight);
/* Rejustify the x and y positions if we need to. */
alignxy (cdkscreen->window, &xpos, &ypos, boxWidth, boxHeight);
/* Make the scrolling window */
scrollp->win = newwin (boxHeight + !!shadow, boxWidth + !!shadow, ypos, xpos);
/* Is the scrolling window null?? */
if (scrollp->win == 0)
{
/* Clean up any memory. */
for (x=0; x < scrollp->titleLines; x++)
{
freeChtype (scrollp->title[x]);
}
free(scrollp);
/* Return a null pointer. */
return (0);
}
keypad (scrollp->win, TRUE);
leaveok (scrollp->win, TRUE);
if (scrollp->titleLines > 0)
{
/* Make the title window. */
scrollp->titleWin = subwin (scrollp->win,
scrollp->titleLines, boxWidth - 2,
ypos + 1, xpos + 1);
}
/* Create the scrollbar window. */
if (splace == RIGHT)
{
scrollp->fieldWin = subwin (scrollp->win,
scrollp->viewSize, scrollp->fieldWidth,
ypos + scrollp->titleLines + 1,
xpos + 1);
scrollp->scrollbarWin = subwin (scrollp->win,
scrollp->viewSize, 1,
ypos + scrollp->titleLines + 1,
xpos + 1 + scrollp->fieldWidth);
}
else if (splace == LEFT)
{
scrollp->scrollbarWin = subwin (scrollp->win,
scrollp->viewSize, 1,
ypos + scrollp->titleLines + 1,
xpos + 1);
scrollp->fieldWin = subwin (scrollp->win,
scrollp->viewSize, scrollp->fieldWidth,
ypos + scrollp->titleLines + 1,
xpos + 2);
}
else
{
scrollp->fieldWin = subwin (scrollp->win,
scrollp->viewSize, scrollp->fieldWidth,
ypos + scrollp->titleLines + 1,
xpos + 1);
scrollp->scrollbarWin = 0;
}
/* Set the rest of the variables */
ScreenOf(scrollp) = cdkscreen;
scrollp->parent = cdkscreen->window;
scrollp->boxHeight = boxHeight;
scrollp->boxWidth = boxWidth;
scrollp->maxLeftChar = 0;
scrollp->currentTop = 0;
scrollp->currentItem = 0;
scrollp->currentHigh = 0;
scrollp->leftChar = 0;
scrollp->highlight = highlight;
scrollp->exitType = vNEVER_ACTIVATED;
ObjOf(scrollp)->box = Box;
scrollp->shadow = shadow;
scrollp->preProcessFunction = 0;
scrollp->preProcessData = 0;
scrollp->postProcessFunction = 0;
scrollp->postProcessData = 0;
scrollp->ULChar = ACS_ULCORNER;
scrollp->URChar = ACS_URCORNER;
scrollp->LLChar = ACS_LLCORNER;
scrollp->LRChar = ACS_LRCORNER;
scrollp->HChar = ACS_HLINE;
scrollp->VChar = ACS_VLINE;
scrollp->BoxAttrib = A_NORMAL;
/* Create the scrolling list item list and needed variables. */
createCDKScrollItemList (scrollp, numbers, list, listSize);
/* Clean the key bindings. */
cleanCDKObjectBindings (vSCROLL, scrollp);
/* Register this baby. */
registerCDKObject (cdkscreen, vSCROLL, scrollp);
/* Return the scrolling list */
return (scrollp);
}
/*
* This actually does all the 'real' work of managing the scrolling list.
*/
int activateCDKScroll (CDKSCROLL *scrollp, chtype *actions)
{
/* Draw the scrolling list */
drawCDKScroll (scrollp, ObjOf(scrollp)->box);
/* Check if actions is null. */
if (actions == 0)
{
/* Declare some local variables. */
chtype input;
int ret;
for (;;)
{
/* Get the input. */
wrefresh (scrollp->win);
input = wgetch (scrollp->win);
/* Inject the character into the widget. */
ret = injectCDKScroll (scrollp, input);
if (scrollp->exitType != vEARLY_EXIT)
{
return ret;
}
}
}
else
{
/* Declare some local variables. */
int length = chlen (actions);
int x, ret;
/* Inject each character one at a time. */
for (x=0; x < length; x++)
{
ret = injectCDKScroll (scrollp, actions[x]);
if (scrollp->exitType != vEARLY_EXIT)
{
return ret;
}
}
}
/* Set the exit type for the widget and return. */
scrollp->exitType = vEARLY_EXIT;
return -1;
}
/*
* This injects a single character into the widget.
*/
int injectCDKScroll (CDKSCROLL *scrollp, chtype input)
{
/* Declare local variables. */
int ppReturn = 1;
/* Set the exit type for the widget. */
scrollp->exitType = vEARLY_EXIT;
/* Draw the scrolling list */
drawCDKScrollList (scrollp);
/* Check if there is a pre-process function to be called. */
if (scrollp->preProcessFunction != 0)
{
/* Call the pre-process function. */
ppReturn = ((PROCESSFN)(scrollp->preProcessFunction)) (vSCROLL, scrollp, scrollp->preProcessData, input);
}
/* Should we continue? */
if (ppReturn != 0)
{
/* Check for a predefined key binding. */
if (checkCDKObjectBind (vSCROLL, scrollp, input) != 0)
{
return -1;
}
else
{
switch (input)
{
case KEY_UP :
if (scrollp->currentItem > 0)
{
scrollp->currentItem--;
if (scrollp->currentHigh == 0)
{
scrollp->currentTop--;
}
else
{
scrollp->currentHigh--;
}
}
else
{
Beep();
}
break;
case KEY_DOWN :
if (scrollp->currentItem < scrollp->listSize - 1)
{
scrollp->currentItem++;
if (scrollp->currentHigh == scrollp->viewSize - 1)
{
scrollp->currentTop++;
}
else
{
scrollp->currentHigh++;
}
}
else
{
Beep();
}
break;
case KEY_LEFT :
if (scrollp->leftChar > 0)
{
scrollp->leftChar--;
}
else
{
Beep();
}
break;
case KEY_RIGHT :
if (scrollp->leftChar < scrollp->maxLeftChar)
{
scrollp->leftChar++;
}
else
{
Beep();
}
break;
case KEY_PPAGE :
case CONTROL('B') :
if (scrollp->currentItem > 0)
{
scrollp->currentTop =
MAXIMUM (scrollp->currentTop - scrollp->viewSize + 1,
0);
scrollp->currentItem =
MAXIMUM (scrollp->currentItem - scrollp->viewSize + 1,
0);
scrollp->currentHigh =
scrollp->currentItem - scrollp->currentTop;
}
else
{
Beep();
}
break;
case KEY_NPAGE :
case CONTROL('F') :
if (scrollp->currentItem < scrollp->listSize - 1)
{
scrollp->currentTop =
MINIMUM (scrollp->currentTop + scrollp->viewSize - 1,
scrollp->maxTopItem);
scrollp->currentItem =
MINIMUM (scrollp->currentItem + scrollp->viewSize - 1,
scrollp->listSize-1);
scrollp->currentHigh =
scrollp->currentItem - scrollp->currentTop;
}
else
{
Beep();
}
break;
case 'g' :
case '1' :
case KEY_HOME :
scrollp->currentTop = 0;
scrollp->currentItem = 0;
scrollp->currentHigh = 0;
break;
case 'G' :
case KEY_END :
scrollp->currentTop = scrollp->maxTopItem;
scrollp->currentItem = scrollp->listSize-1;
scrollp->currentHigh = scrollp->currentItem - scrollp->currentTop;
break;
case '|' :
scrollp->leftChar = 0;
break;
case '$' :
scrollp->leftChar = scrollp->maxLeftChar;
break;
case KEY_ESC :
scrollp->exitType = vESCAPE_HIT;
return -1;
case KEY_RETURN :
case KEY_TAB :
case KEY_ENTER :
case KEY_CR :
scrollp->exitType = vNORMAL;
return scrollp->currentItem;
case CDK_REFRESH :
eraseCDKScreen (ScreenOf(scrollp));
refreshCDKScreen (ScreenOf(scrollp));
break;
default :
Beep();
break;
}
}
/* Should we call a post-process? */
if (scrollp->postProcessFunction != 0)
{
((PROCESSFN)(scrollp->postProcessFunction)) (vSCROLL, scrollp, scrollp->postProcessData, input);
}
}
/* Redraw the list */
drawCDKScrollList (scrollp);
/* Set the exit type and return. */
scrollp->exitType = vEARLY_EXIT;
return -1;
}
/*
* This allows the user to accelerate to a position in the scrolling list.
*/
void setCDKScrollPosition (CDKSCROLL *scrollp, int item)
{
if (item < scrollp->currentTop)
{
item = MAXIMUM (item, 0);
scrollp->currentTop = item;
}
else if (item > scrollp->currentTop + (scrollp->viewSize - 1))
{
item = MINIMUM (item, scrollp->listSize - 1);
scrollp->currentTop = item - (scrollp->viewSize - 1);
}
scrollp->currentItem = item;
scrollp->currentHigh = item - scrollp->currentTop;
}
/*
* This moves the scroll field to the given location.
*/
static void _moveCDKScroll (CDKOBJS *object, int xplace, int yplace, boolean relative, boolean refresh_flag)
{
CDKSCROLL *scrollp = (CDKSCROLL *)object;
/*
* If this is a relative move, then we will adjust where we want
* to move to.
*/
if (relative)
{
xplace += getbegx(scrollp->win);
yplace += getbegy(scrollp->win);
}
/* Adjust the window if we need to. */
alignxy (WindowOf(scrollp), &xplace, &yplace, scrollp->boxWidth, scrollp->boxHeight);
/* Move the window to the new location. */
moveCursesWindow(scrollp->win, xplace, yplace);
/* Redraw the window, if they asked for it. */
if (refresh_flag)
{
drawCDKScroll (scrollp, ObjOf(scrollp)->box);
}
}
/*
* This function draws the scrolling list widget.
*/
static void _drawCDKScroll (CDKOBJS *object, boolean Box)
{
CDKSCROLL *scrollp = (CDKSCROLL *)object;
int x;
/* Box it if needed. */
if (Box)
{
attrbox (scrollp->win,
scrollp->ULChar, scrollp->URChar,
scrollp->LLChar, scrollp->LRChar,
scrollp->HChar, scrollp->VChar,
scrollp->BoxAttrib,
scrollp->shadow);
}
if (scrollp->titleLines > 0)
{
/* Draw in the title if there is one. */
for (x=0; x < scrollp->titleLines; x++)
{
writeChtype (scrollp->titleWin,
scrollp->titlePos[x], x,
scrollp->title[x],
HORIZONTAL, 0,
scrollp->titleLen[x]);
}
wnoutrefresh (scrollp->titleWin);
}
/* Draw in the scolling list items. */
drawCDKScrollList (scrollp);
}
/*
* This redraws the scrolling list.
*/
static void drawCDKScrollList (CDKSCROLL *scrollp)
{
/* Declare some local vars */
int screenPos, x, y;
werase (scrollp->fieldWin);
/* Redraw the list. */
for (x=0, y=scrollp->currentTop; x < scrollp->viewSize; x++, y++)
{
if (y >= scrollp->listSize)
{
break;
}
screenPos = scrollp->itemPos[y] - scrollp->leftChar;
/* Write in the correct line. */
if (y == scrollp->currentItem)
{
if (screenPos >= 0)
{
writeChtypeAttrib (scrollp->fieldWin,
screenPos, x,
scrollp->item[y],
scrollp->highlight,
HORIZONTAL, 0,
scrollp->itemLen[y]);
}
else
{
writeChtypeAttrib (scrollp->fieldWin,
0, x,
scrollp->item[y],
scrollp->highlight,
HORIZONTAL, -screenPos,
scrollp->itemLen[y]);
}
}
else
{
if (screenPos >= 0)
{
writeChtype (scrollp->fieldWin,
screenPos, x,
scrollp->item[y],
HORIZONTAL, 0,
scrollp->itemLen[y]);
}
else
{
writeChtype (scrollp->fieldWin,
0, x,
scrollp->item[y],
HORIZONTAL, -screenPos,
scrollp->itemLen[y]);
}
}
}
if (scrollp->scrollbar)
{
int togglePos;
/* Determine where the toggle is supposed to be. */
if (scrollp->listSize >= scrollp->viewSize)
togglePos = floorCDK ((float)scrollp->viewSize * (float)scrollp->currentItem / (float)scrollp->listSize);
else
togglePos = floorCDK ((float)(scrollp->viewSize - scrollp->toggleSize) * (float)scrollp->currentItem / (float)(scrollp->listSize - 1));
/* Make sure the toggle button doesn't go out of bounds. */
togglePos = MINIMUM (togglePos, scrollp->viewSize - scrollp->toggleSize);
/* Draw the scrollbar. */
mvwvline (scrollp->scrollbarWin, 0, 0, ACS_CKBOARD, scrollp->viewSize);
mvwvline (scrollp->scrollbarWin, togglePos, 0, ' ' | A_REVERSE, scrollp->toggleSize);
wnoutrefresh (scrollp->scrollbarWin);
}
/* Refresh the window. */
wnoutrefresh (scrollp->fieldWin);
wnoutrefresh (scrollp->win);
}
/*
* These functions set the drawing characters of the widget.
*/
void setCDKScrollULChar (CDKSCROLL *scrollp, chtype character)
{
scrollp->ULChar = character;
}
void setCDKScrollURChar (CDKSCROLL *scrollp, chtype character)
{
scrollp->URChar = character;
}
void setCDKScrollLLChar (CDKSCROLL *scrollp, chtype character)
{
scrollp->LLChar = character;
}
void setCDKScrollLRChar (CDKSCROLL *scrollp, chtype character)
{
scrollp->LRChar = character;
}
void setCDKScrollVerticalChar (CDKSCROLL *scrollp, chtype character)
{
scrollp->VChar = character;
}
void setCDKScrollHorizontalChar (CDKSCROLL *scrollp, chtype character)
{
scrollp->HChar = character;
}
void setCDKScrollBoxAttribute (CDKSCROLL *scrollp, chtype character)
{
scrollp->BoxAttrib = character;
}
/*
* This sets the background color of the widget.
*/
void setCDKScrollBackgroundColor (CDKSCROLL *scrollp, char *color)
{
chtype *holder = 0;
int junk1, junk2;
/* Make sure the color isn't null. */
if (color == 0)
{
return;
}
/* Convert the value of the environment variable to a chtype. */
holder = char2Chtype (color, &junk1, &junk2);
/* Set the widgets background color. */
wbkgd (scrollp->win, holder[0]);
if (scrollp->scrollbar)
{
wbkgd (scrollp->scrollbarWin, holder[0]);
}
/* Clean up. */
freeChtype (holder);
}
/*
* This function destroys
*/
void destroyCDKScroll (CDKSCROLL *scrollp)
{
/* Declare local variables. */
int x;
/* Erase the object. */
eraseCDKScroll (scrollp);
/* Clean up the char pointers. */
for (x=0; x < scrollp->titleLines; x++)
{
freeChtype (scrollp->title[x]);
}
for (x=0; x < scrollp->listSize; x++)
{
freeChtype (scrollp->item[x]);
}
/* Clean up the windows. */
deleteCursesWindow (scrollp->win);
/* Unregister this object. */
unregisterCDKObject (vSCROLL, scrollp);
/* Finish cleaning up. */
free (scrollp);
}
/*
* This function erases the scrolling list from the screen.
*/
static void _eraseCDKScroll (CDKOBJS *object)
{
CDKSCROLL *scrollp = (CDKSCROLL *)object;
eraseCursesWindow (scrollp->win);
}
/*
* This function creates massages the scrolling list information and
* sets up the needed variables for the scrolling list to work correctly.
*/
static void createCDKScrollItemList (CDKSCROLL *scrollp, boolean numbers, char **list, int listSize)
{
/* Declare local variables. */
int widestItem, x;
char temp[100];
/* Is the view size larger than the list? */
scrollp->listSize = listSize;
scrollp->maxTopItem = MAXIMUM (0, listSize - scrollp->viewSize);
/* Set the information for the scroll bar. */
if (listSize >= scrollp->viewSize)
scrollp->toggleSize = 1;
else
scrollp->toggleSize = floorCDK ((float)scrollp->viewSize / (float)listSize + 0.5);
/* Create the items in the scrolling list. */
widestItem = 0;
if (numbers == NUMBERS)
{
for (x=0 ; x < listSize; x++)
{
snprintf (temp, sizeof(temp), "%4d. %s", x + 1, list[x]);
scrollp->item[x] = char2Chtype (temp, &scrollp->itemLen[x], &scrollp->itemPos[x]);
scrollp->itemPos[x] = justifyString (scrollp->fieldWidth, scrollp->itemLen[x], scrollp->itemPos[x]);
widestItem = MAXIMUM (widestItem, scrollp->itemLen[x]);
}
}
else
{
for (x=0 ; x < listSize; x++)
{
scrollp->item[x] = char2Chtype (list[x], &scrollp->itemLen[x], &scrollp->itemPos[x]);
scrollp->itemPos[x] = justifyString (scrollp->fieldWidth, scrollp->itemLen[x], scrollp->itemPos[x]);
widestItem = MAXIMUM (widestItem, scrollp->itemLen[x]);
}
}
/* Determine how many characters we can shift to the right */
/* before all the items have been scrolled off the screen. */
scrollp->maxLeftChar = MAXIMUM (0, widestItem - scrollp->fieldWidth);
/* Keep the boolean flag 'numbers' */
scrollp->numbers = numbers;
}
/*
* This sets certain attributes of the scrolling list.
*/
void setCDKScroll (CDKSCROLL *scrollp, char **list, int listSize, boolean numbers, chtype highlight, boolean Box)
{
setCDKScrollItems (scrollp, list, listSize, numbers);
setCDKScrollHighlight (scrollp, highlight);
setCDKScrollBox (scrollp, Box);
}
/*
* This sets the scrolling list items.
*/
void setCDKScrollItems (CDKSCROLL *scrollp, char **list, int listSize, boolean numbers)
{
/* Declare some wars. */
int x;
/* Clean out the old list. */
for (x=0; x < scrollp->listSize; x++)
{
freeChtype (scrollp->item[x]);
scrollp->itemLen[x] = 0;
scrollp->itemPos[x] = 0;
}
/* Set some vars. */
scrollp->currentTop = 0;
scrollp->currentItem = 0;
scrollp->currentHigh = 0;
scrollp->leftChar = 0;
/* Set up the new list. */
createCDKScrollItemList (scrollp, numbers, list, listSize);
}
int getCDKScrollItems (CDKSCROLL *scrollp, char *list[])
{
int x;
for (x=0; x < scrollp->listSize; x++)
{
list[x] = chtype2Char (scrollp->item[x]);
}
return scrollp->listSize;
}
/*
* This sets the highlight of the scrolling list.
*/
void setCDKScrollHighlight (CDKSCROLL *scrollp, chtype highlight)
{
scrollp->highlight = highlight;
}
chtype getCDKScrollHighlight (CDKSCROLL *scrollp, chtype highlight GCC_UNUSED)
{
return scrollp->highlight;
}
/*
* This sets the box attribute of the scrolling list.
*/
void setCDKScrollBox (CDKSCROLL *scrollp, boolean Box)
{
ObjOf(scrollp)->box = Box;
}
boolean getCDKScrollBox (CDKSCROLL *scrollp)
{
return ObjOf(scrollp)->box;
}
/*
* This adds a single item to a scrolling list.
*/
void addCDKScrollItem (CDKSCROLL *scrollp, char *item)
{
/* Declare some local variables. */
int itemNumber = scrollp->listSize;
int widestItem = scrollp->maxLeftChar + scrollp->fieldWidth;
char temp[256];
/*
* If the scrolling list has numbers, then add the new item
* with a numeric value attached.
*/
if (scrollp->numbers == NUMBERS)
{
snprintf (temp, sizeof(temp), "%4d. %s", itemNumber + 1, item);
scrollp->item[itemNumber] = char2Chtype (temp, &scrollp->itemLen[itemNumber], &scrollp->itemPos[itemNumber]);
scrollp->itemPos[itemNumber] = justifyString (scrollp->fieldWidth, scrollp->itemLen[itemNumber], scrollp->itemPos[itemNumber]);
}
else
{
scrollp->item[itemNumber] = char2Chtype (item, &scrollp->itemLen[itemNumber], &scrollp->itemPos[itemNumber]);
scrollp->itemPos[itemNumber] = justifyString (scrollp->fieldWidth, scrollp->itemLen[itemNumber], scrollp->itemPos[itemNumber]);
}
/* Determine the size of the widest item. */
widestItem = MAXIMUM (scrollp->itemLen[itemNumber], widestItem);
scrollp->maxLeftChar = MAXIMUM (0, widestItem - scrollp->fieldWidth);
/* Increment the list size. */
scrollp->listSize++;
scrollp->maxTopItem = MAXIMUM (0, scrollp->listSize - scrollp->viewSize);
/* Reset some variables. */
scrollp->currentTop = 0;
scrollp->currentItem = 0;
scrollp->currentHigh = 0;
scrollp->leftChar = 0;
}
/*
* This adds a single item to a scrolling list.
*/
void deleteCDKScrollItem (CDKSCROLL *scrollp, int position)
{
/* Declare some local variables. */
int x;
/* Nuke the current item. */
freeChtype (scrollp->item[position]);
/* Adjust the list. */
for (x=position; x < scrollp->listSize-1; x++)
{
scrollp->item[x] = scrollp->item[x + 1];
scrollp->itemLen[x] = scrollp->itemLen[x + 1];
scrollp->itemPos[x] = scrollp->itemPos[x + 1];
}
/* Decrement the list size. */
scrollp->listSize--;
scrollp->maxTopItem = MAXIMUM (0, scrollp->listSize - scrollp->viewSize);
/* Reset some variables. */
scrollp->currentTop = 0;
scrollp->currentItem = 0;
scrollp->currentHigh = 0;
scrollp->leftChar = 0;
}
/*
* This function sets the pre-process function.
*/
void setCDKScrollPreProcess (CDKSCROLL *scrollp, PROCESSFN callback, void *data)
{
scrollp->preProcessFunction = callback;
scrollp->preProcessData = data;
}
/*
* This function sets the post-process function.
*/
void setCDKScrollPostProcess (CDKSCROLL *scrollp, PROCESSFN callback, void *data)
{
scrollp->postProcessFunction = callback;
scrollp->postProcessData = data;
}