private static int CalculateHeightOfMiddlePartOfScrollBar(ICanHaveHorizontalScrollBar parent, int bgWidth)
{
int midWidth;
if (parent.HorizontalItemCount <= parent.HorizontalMaxVisibleItems)
{
midWidth = bgWidth - (BarEndsWidth * 2);
}
else
{
midWidth = ((parent.HorizontalMaxVisibleItems * bgWidth)
/ parent.HorizontalItemCount)
- BarEndsWidth * 2;
}
if (midWidth >= bgWidth)
{
midWidth = bgWidth - (BarEndsWidth * 2);
}
else if (midWidth <= 0)
{
midWidth = 0;
}
return(midWidth);
}
public HorizontalScrollBar(IWindow window, ICanHaveHorizontalScrollBar parent,
Border border)
: base(window, parent)
{
// scrollbars must be attached to a control
Window = window;
Parent = parent ?? throw new ArgumentNullException(nameof(parent));
_spriteSheet = Ui.SpriteSheet;
_border = border;
ZIndex = parent.ZIndex;
Visible = true;
_leftArrow = new IconButtonUsingOverlay(window, this, Ui.ScrollBar.LeftArrow,
Ui.ScrollBar.ArrowNormalOverlay, Ui.ScrollBar.ArrowPressedOverlay, Rectangle.Empty);
_leftArrow.SetOnClick(ScrollUp);
_rightArrow = new IconButtonUsingOverlay(window, this, Ui.ScrollBar.RightArrow,
Ui.ScrollBar.ArrowNormalOverlay, Ui.ScrollBar.ArrowPressedOverlay, Rectangle.Empty);
_rightArrow.SetOnClick(ScrollDown);
_draggable = new Draggable(MouseButton.Left, 5);
_mouseScrollable = new MouseScrollable(parent, ModifierKeys.Shift);
_mouseScrollable.OnScroll = ScrollMouse;
}
