/**
* @brief Mouse event focus on image array.
*
* @param iar Image Array widget.
* @param bx X position click.
* @param by Y position click.
*/
static void iar_focus( Widget* iar, double bx, double by )
{
double y, h;
double scroll_pos, hmax;
int yelem;
int selected;
/* element dimensions */
iar_getDim( iar, NULL, &h );
/* number of elements */
yelem = iar->dat.iar.yelem;
/* Test for item click. */
selected = iar_focusImage( iar, bx, by );
if (selected >= 0) {
iar->dat.iar.selected = selected;
if (iar->dat.iar.fptr != NULL)
iar->dat.iar.fptr( iar->wdw, iar->name );
}
/* Scrollbar click. */
else if (bx > iar->w - 10.) {
/* Get bar position (center). */
hmax = h * (yelem - (int)(iar->h / h));
if (fabs(hmax) < 1e-05)
scroll_pos = 0.;
else
scroll_pos = iar->dat.iar.pos / hmax;
y = iar->h - (iar->h - 30.) * scroll_pos - 15.;
/* Click below the bar. */
if (by < y-15.)
iar_scroll( iar, -2 );
/* Click above the bar. */
else if (by > y+15.)
iar_scroll( iar, +2 );
/* Click on the bar. */
else
iar->status = WIDGET_STATUS_SCROLLING;
}
}
/**
* @brief Handles mouse movement for an image array.
*
* @param iar Widget handling the mouse motion.
* @param mmove Mouse motion event to handle.
* @return 1 if the event is used.
*/
static int iar_mmove( Widget* iar, int x, int y, int rx, int ry )
{
(void) rx;
(void) ry;
double w,h;
int xelem, yelem;
double hmax;
if (iar->status == WIDGET_STATUS_SCROLLING) {
y = CLAMP( 15, iar->h - 15., iar->h - y );
/* element dimensions */
iar_getDim( iar, &w, &h );
/* number of elements */
xelem = iar->dat.iar.xelem;
yelem = iar->dat.iar.yelem;
hmax = h * (yelem - (int)(iar->h / h));
iar->dat.iar.pos = (y - 15.) * hmax / (iar->h - 30.);
/* Does boundry checks. */
iar_scroll( iar, 0 );
return 1;
}
else {
if ((x < 0) || (x >= iar->w) || (y < 0) || (y >= iar->h))
iar->dat.iar.alt = -1;
else {
iar->dat.iar.alt = iar_focusImage( iar, x, y );
iar->dat.iar.altx = x;
iar->dat.iar.alty = y;
}
}
return 0;
}
