using System;
using System.Windows.Forms;
using System.Drawing;

namespace GForms {
    class GForm : Control {
        // This is a GControl host, meant to be put inside a form.
        // It's not actually a form by itself. All it contains is
        // a generic GControl object that holds other GControls.

        private GControl mainControl = new GControl();
        public GForm() {
            this.Dock = DockStyle.Fill;
            this.DoubleBuffered = true;
            this.SetStyle(ControlStyles.ContainerControl, false); // no controls can be added
            this.MainControl.Changed += (GControl sender) => this.Invalidate();
        }

        protected override void OnPaint(PaintEventArgs e) {
            Graphics g = e.Graphics;

            // draw the main control
            this.MainControl.DrawBackground(g, this.ClientRectangle);
            this.MainControl.Draw(g, this.ClientRectangle);

            // raise the base event
            base.OnPaint(e);
        }

        protected override void OnMouseDown(MouseEventArgs e) {
            this.MainControl.OnMouseDown(e.Location, e.Button);
            base.OnMouseDown(e);
        }

        protected override void OnMouseUp(MouseEventArgs e) {
            this.MainControl.OnMouseUp(e.Location, e.Button);
            base.OnMouseUp(e);
        }

        protected override void OnMouseMove(MouseEventArgs e) {
            this.MainControl.OnMouseMove(e.Location, e.Button);
            base.OnMouseMove(e);
        }

        public GControl MainControl {
            get {
                return mainControl;
            }
        }
    }
}