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using System;
using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Graphics;
namespace Celesteia.UI.Elements {
public class Element : IElement
{
private bool _enabled = true;
private Rect _rect;
private bool _isMouseOver;
private IContainer _parent;
private Vector2 _pivot;
public virtual bool GetEnabled() => _enabled && (_parent == null || _parent.GetEnabled());
public virtual IContainer GetParent() => _parent;
public virtual Vector2 GetPivot() => _pivot;
public virtual Rect GetRect() => _rect;
public virtual void MoveTo(Point point) {
_rect.SetX(AbsoluteUnit.WithValue(point.X));
_rect.SetY(AbsoluteUnit.WithValue(point.Y));
}
// Get element rectangle with pivot.
public virtual Rectangle GetRectangle() {
Rectangle r = GetRect().ResolveRectangle();
if (GetParent() != null) {
r.X += GetParent().GetRectangle().X;
r.Y += GetParent().GetRectangle().Y;
}
r.X -= (int)MathF.Round(_pivot.X * r.Width);
r.Y -= (int)MathF.Round(_pivot.Y * r.Height);
return r;
}
// Interface setters.
public virtual bool SetEnabled(bool value) => _enabled = value;
public virtual void SetParent(IContainer container) => _parent = container;
public virtual void SetPivot(Vector2 pivot) => _pivot = pivot;
public virtual void SetRect(Rect rect) => _rect = rect;
// Mouse functions
public virtual void OnMouseIn() => _isMouseOver = true;
public virtual void OnMouseOut() => _isMouseOver = false;
public virtual bool GetMouseOver() => _isMouseOver;
// Engine functions.
public virtual void Update(GameTime gameTime, out bool clickedAnything) { clickedAnything = false; }
public virtual void Draw(SpriteBatch spriteBatch) { }
}
}
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