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#include <cdk.h>
#include <cdk_int.h>
#include <scroller.h>
/*
* $Author: aleahmad $
* $Date: 2016/11/20 13:57:20 $
* $Revision: 1.3 $
*/
void scroller_KEY_UP (CDKSCROLLER *scroller)
{
if (scroller->listSize <= 0 || scroller->currentItem <= 0)
{
Beep ();
return;
}
scroller->currentItem--;
if (scroller->currentHigh)
{
scroller->currentHigh--;
}
if (scroller->currentTop && scroller->currentItem < scroller->currentTop)
{
scroller->currentTop--;
}
}
void scroller_KEY_DOWN (CDKSCROLLER *scroller)
{
if (scroller->listSize <= 0 || scroller->currentItem >= scroller->lastItem)
{
Beep ();
return;
}
scroller->currentItem++;
if (scroller->currentHigh < scroller->viewSize - 1)
{
scroller->currentHigh++;
}
if (scroller->currentTop < scroller->maxTopItem
&& scroller->currentItem > (scroller->currentTop + scroller->viewSize
- 1))
{
scroller->currentTop++;
}
}
void scroller_KEY_LEFT (CDKSCROLLER *scroller)
{
if (scroller->listSize <= 0 || scroller->leftChar <= 0)
{
Beep ();
return;
}
scroller->leftChar--;
}
void scroller_KEY_RIGHT (CDKSCROLLER *scroller)
{
if (scroller->listSize <= 0 || scroller->leftChar >= scroller->maxLeftChar)
{
Beep ();
return;
}
scroller->leftChar++;
}
void scroller_KEY_PPAGE (CDKSCROLLER *scroller)
{
int viewSize = scroller->viewSize - 1;
if (scroller->listSize <= 0 || scroller->currentTop <= 0)
{
Beep ();
return;
}
if (scroller->currentTop < viewSize)
{
scroller_KEY_HOME (scroller);
}
else
{
scroller->currentTop -= viewSize;
scroller->currentItem -= viewSize;
}
}
void scroller_KEY_NPAGE (CDKSCROLLER *scroller)
{
int viewSize = scroller->viewSize - 1;
if (scroller->listSize <= 0 || scroller->currentTop >= scroller->maxTopItem)
{
Beep ();
return;
}
if ((scroller->currentTop + viewSize) <= scroller->maxTopItem)
{
scroller->currentTop += viewSize;
scroller->currentItem += viewSize;
}
else
{
scroller_KEY_END (scroller);
}
}
void scroller_KEY_HOME (CDKSCROLLER *scroller)
{
scroller->currentTop = 0;
scroller->currentItem = 0;
scroller->currentHigh = 0;
}
void scroller_KEY_END (CDKSCROLLER *scroller)
{
scroller->currentTop = scroller->maxTopItem;
scroller->currentItem = scroller->lastItem;
scroller->currentHigh = scroller->viewSize - 1;
}
void scroller_FixCursorPosition (CDKSCROLLER *scroller)
{
int scrollbarAdj = (scroller->scrollbarPlacement == LEFT) ? 1 : 0;
int ypos = SCREEN_YPOS (scroller, scroller->currentItem - scroller->currentTop);
int xpos = SCREEN_XPOS (scroller, 0) + scrollbarAdj;
wmove (InputWindowOf (scroller), ypos, xpos);
wrefresh (InputWindowOf (scroller));
}
void scroller_SetPosition (CDKSCROLLER *scroller, int item)
{
/* item out of band */
if (item <= 0)
{
scroller_KEY_HOME (scroller);
return;
}
/* item out of band */
if (item >= scroller->lastItem)
{
scroller_KEY_END (scroller);
return;
}
/* item in first view port */
if (item < scroller->viewSize)
{
scroller->currentTop = 0;
}
/* item in last view port */
else if (item >= scroller->lastItem - scroller->viewSize)
{
scroller->currentTop = scroller->maxTopItem;
}
/* item not in visible view port */
else if (item < scroller->currentTop || item >= scroller->currentTop + scroller->viewSize)
{
scroller->currentTop = item;
}
scroller->currentItem = item;
scroller->currentHigh = scroller->currentItem - scroller->currentTop;
}
int scroller_MaxViewSize (CDKSCROLLER *scroller)
{
return (scroller->boxHeight - (2 * BorderOf (scroller) + TitleLinesOf (scroller)));
}
void scroller_SetViewSize (CDKSCROLLER *scroller, int size)
{
int max_view_size = scroller_MaxViewSize (scroller);
scroller->viewSize = max_view_size;
scroller->listSize = size;
scroller->lastItem = size - 1;
scroller->maxTopItem = size - scroller->viewSize;
if (size < scroller->viewSize)
{
scroller->viewSize = size;
scroller->maxTopItem = 0;
}
if (scroller->listSize > 0 && max_view_size > 0)
{
scroller->step = (float)(max_view_size / (double)scroller->listSize);
scroller->toggleSize = ((scroller->listSize > max_view_size)
? 1
: ceilCDK (scroller->step));
}
else
{
scroller->step = 1;
scroller->toggleSize = 1;
}
}
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