Reading Ultrabook Sensor Data with the Windows 8 Sensor API

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

namespace RedCell.App.Sensors
{
    /// <summary>
    /// A Metro-style group box.
    /// </summary>
    public class GroupBox : Panel
    {
        private Brush _back;
        private Brush _fore;

        /// <summary>
        /// Initializes a new instance of the <see cref="GroupBox" /> class.
        /// </summary>
        public GroupBox()
        {
            Initialize();
        }

        /// <summary>
        /// Initializes a new instance of the <see cref="GroupBox" /> class.
        /// </summary>
        /// <param name="container">The container.</param>
        public GroupBox(IContainer container)
        {
            Initialize();
        }

        /// <summary>
        /// Initializes this instance.
        /// </summary>
        private void Initialize()
        {
            // Default
            _back = new SolidBrush(Color.DarkGray); 
            _fore = new SolidBrush(Color.White);
        }

        /// <summary>
        /// Gets or sets the background color for the control.
        /// </summary>
        /// <value>The color of the back.</value>
        /// <returns>A <see cref="T:System.Drawing.Color" /> that represents the background color of the control. The default is the value of the <see cref="P:System.Windows.Forms.Control.DefaultBackColor" /> property.</returns>
        ///   <PermissionSet>
        ///   <IPermission class="System.Security.Permissions.FileIOPermission, mscorlib, Version=2.0.3600.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" version="1" Unrestricted="true" />
        ///   </PermissionSet>
        [DesignerSerializationVisibility(DesignerSerializationVisibility.Visible)]
        [DefaultValue(typeof(Color), "DarkGray")]
        public override Color BackColor
        {
            get { return base.BackColor; }
            set { base.BackColor = value; }
        }

        /// <summary>
        /// Raises the <see cref="E:System.Windows.Forms.Control.ForeColorChanged" /> event.
        /// </summary>
        /// <param name="e">An <see cref="T:System.EventArgs" /> that contains the event data.</param>
        protected override void OnForeColorChanged(System.EventArgs e)
        {
            base.OnForeColorChanged(e);
            if(_fore != null)
                _fore.Dispose();
            _fore = new SolidBrush(ForeColor);
        }

        /// <summary>
        /// Raises the <see cref="E:System.Windows.Forms.Control.BackColorChanged" /> event.
        /// </summary>
        /// <param name="e">An <see cref="T:System.EventArgs" /> that contains the event data.</param>
        protected override void OnBackColorChanged(System.EventArgs e)
        {
            base.OnBackColorChanged(e);
            if (_back != null)
                _back.Dispose();
            _back = new SolidBrush(BackColor);
        }

        /// <summary>
        /// Raises the <see cref="E:PaintBackground" /> event.
        /// </summary>
        /// <param name="e">The <see cref="PaintEventArgs" /> instance containing the event data.</param>
        protected override void OnPaintBackground(PaintEventArgs e)
        {
            e.Graphics.FillRectangle(_back, e.ClipRectangle);
        }

        /// <summary>
        /// Raises the <see cref="E:Paint" /> event.
        /// </summary>
        /// <param name="e">A <see cref="T:System.Windows.Forms.PaintEventArgs" /> that contains the event data.</param>
        protected override void OnPaint(PaintEventArgs e)
        {
            e.Graphics.DrawString(Text, Font, _fore, 10, Height - 10 - Font.Size);
        }

        /// <summary>
        /// Releases the unmanaged resources used by the <see cref="T:System.Windows.Forms.Control" /> and its child controls and optionally releases the managed resources.
        /// </summary>
        /// <param name="disposing">true to release both managed and unmanaged resources; false to release only unmanaged resources.</param>
        protected override void Dispose(bool disposing)
        {
            base.Dispose(disposing);
            if(_fore != null)
                _fore.Dispose();
            _fore = null;
            if (_back != null)
                _back.Dispose();
            _back = null;
        }
    }
}