void ScrollBox::__Update(const Point2i & mousePosition,
const Point2i & /*lastMousePosition*/)
{
// update position of items because of dragging
if (HasScrollBar() && scroll_mode!=SCROLL_MODE_NONE) {
int max_offset = GetMaxOffset();
int new_offset = offset;
if (scroll_mode == SCROLL_MODE_THUMB) {
Point2i track_pos = GetScrollTrackPos();
int height = GetTrackHeight();
new_offset = start_drag_offset +
((mousePosition.y - start_drag_y) * (size.y+max_offset))/height;
} else if (scroll_mode == SCROLL_MODE_DRAG) {
// Act as if the scroll corresponds to bringing the starting point to the
// current point
new_offset = start_drag_offset + start_drag_y - mousePosition.y;
}
if (new_offset < 0)
new_offset = 0;
if (new_offset > max_offset)
new_offset = max_offset;
if (new_offset != offset) {
offset = new_offset;
Pack();
}
}
}
void SetArrangeScrollTo(MediaTrack* track, VerticalZoomCenter center)
{
int offsetY;
int height = GetTrackHeight(track, &offsetY);
SetArrangeScroll(offsetY, height, center);
}
