public override void Draw(SpaceGame target)
{
base.Draw(target);
AABB contentRect = GetContentAABB();
int runningHeight = padding;
runningHeight -= (int)(scrollLocation / bounds.Height * contentRect.Height);
foreach (UIElement element in contents)
{
AABB bounds = element.bounds.AtOrigin;
element.bounds.topLeft = topLeft + (padding, runningHeight);
element.bounds.bottomRight = element.bounds.topLeft + bounds.bottomRight;
runningHeight += (int)element.bounds.Height + padding;
}
// use back buffer for clipping
target.DrawTarget = backBuffer;
target.Clear(PixelEngine.Pixel.Empty);
foreach (UIElement element in contents)
{
element.Update(target);
if (bounds.Overlaps(element.bounds))
{
element.Draw(target);
}
}
scrollbarHeight = bounds.Height / contentRect.Height * bounds.Height;
AABB scrollbarRect = new AABB(topRight + (-10, scrollLocation), topRight + (0, scrollbarHeight + scrollLocation));
scrollBar.bounds = scrollbarRect;
// only draw scrollbar if scrolling is required
if (scrollbarHeight != size.y)
{
scrollBar.Update(target);
scrollBar.Draw(target);
}
// switch back to main buffer
PixelEngine.Sprite scrollContainerSurface = target.DrawTarget;
target.DrawTarget = null;
target.DrawPartialSprite(topLeft, scrollContainerSurface, topLeft, (int)bounds.Width, (int)bounds.Height);
}
public ScrollContainer(Vector2 position, Vector2 size) : base(position, size)
{
contents = new List <UIElement>();
scrollLocation = 0;
backBuffer = new PixelEngine.Sprite(SpaceGame.Instance.ScreenWidth, SpaceGame.Instance.ScreenHeight);
scrollBar = new TextButton((0, 0), (1, 1), "");
scrollBar.OnMouseHeld += HandleScroll;
Random rng = new Random();
for (int i = 0; i < 100; i++)
{
contents.Add(new TextButton((position.x, position.y /*+ (i * 10)*/), $"{i}")
{
currentColours = UIColourCollection.DefaultUp
});
