/* Calculate the size, in pixels, of the invisible columns/lines,
the left/above of the first column/line.
In fact the start position of the visible area.
Depends on the first visible column/line.
-> m : choose will operate on lines or columns [IMAT_PROCESS_LIN|IMAT_PROCESS_COL]
*/
void iupMatrixAuxUpdateScrollPos(Ihandle* ih, int m)
{
float pos;
int i, sb, scroll_pos;
char* POS;
ImatLinColData *p;
if (m == IMAT_PROCESS_LIN)
{
p = &(ih->data->lines);
sb = IUP_SB_VERT;
POS = "POSY";
}
else
{
p = &(ih->data->columns);
sb = IUP_SB_HORIZ;
POS = "POSX";
}
/* "first" was changed, so update "last" and the scroll pos */
if (p->total_visible_size <= p->current_visible_size)
{
/* the matrix is fully visible */
p->first = p->num_noscroll;
p->first_offset = 0;
p->last = p->num==p->num_noscroll? p->num_noscroll: p->num-1;
if (ih->data->canvas.sb & sb)
IupSetAttribute(ih, POS, "0");
return;
}
/* must check if it is a valid position */
scroll_pos = 0;
for(i = p->num_noscroll; i < p->first; i++)
scroll_pos += p->dt[i].size;
scroll_pos += p->first_offset;
if (scroll_pos + p->current_visible_size > p->total_visible_size)
{
/* invalid condition, must recalculate so it is valid */
scroll_pos = p->total_visible_size - p->current_visible_size;
/* position first and first_offset, according to scroll pos */
iupMatrixAuxAdjustFirstFromScrollPos(p, scroll_pos);
}
pos = (float)scroll_pos/(float)p->total_visible_size;
/* update last */
iupMatrixAuxUpdateLast(p);
/* update scroll pos */
if (ih->data->canvas.sb & sb)
IupSetFloat(ih, POS, pos);
}
/* This function is called when a drag is performed in the scrollbar.
-> x : scrollbar thumb position, value between 0 and 1
-> mode : DO NOT USED
-> m : define the mode of operation: lines or columns [IMAT_PROCESS_LIN|IMAT_PROCESS_COL]
*/
void iupMatrixScrollPosFunc(Ihandle* ih, int mode, float pos, int m)
{
int scroll_pos;
ImatLinColData* p;
(void)mode;
if (m == IMAT_PROCESS_LIN)
p = &(ih->data->lines);
else
p = &(ih->data->columns);
if (p->num == 1)
{
p->first = 1;
p->first_offset = 0;
return;
}
scroll_pos = (int)(pos * p->total_size + 0.5);
/* position first and first_offset, according to scroll pos */
iupMatrixAuxAdjustFirstFromScrollPos(p, scroll_pos);
}
