osu/osu.Game/GameModes/Menu/FlowContainerWithOrigin.cs

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using OpenTK;
using osu.Framework.Graphics;
using osu.Framework.Graphics.Containers;
namespace osu.Game.GameModes.Menu
{
/// <summary>
/// A flow container with an origin based on one of its contained drawables.
/// </summary>
public class FlowContainerWithOrigin : FlowContainer
{
/// <summary>
/// A target drawable which this flowcontainer should be centered around.
/// This target MUST be in this FlowContainer's *direct* children.
/// </summary>
internal Drawable CentreTarget;
public override Anchor Origin => Anchor.Custom;
public override Vector2 OriginPosition
{
get
{
if (CentreTarget == null)
return base.OriginPosition;
return CentreTarget.Position + CentreTarget.Size / 2;
}
}
public FlowContainerWithOrigin()
{
Direction = FlowDirection.HorizontalOnly;
}
}
}