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C# MIDI Toolkit

, 18 Apr 2007 MIT
A toolkit for creating MIDI applications with C#.
csharpmiditoolkitv4_demo.zip
CSharpMidiToolkitV4_demo
LSCollections.dll
MidiToolkitDemo
Properties
Settings.settings
MidiWatcher
Properties
Settings.settings
Multimedia.dll
Multimedia.Midi
Clocks
Device Classes
InputDevice Class
OutputDevice Classes
Messages
Message Builders
Multimedia.Midi.csproj.user
Processing
Sequencing
Midi File Player
Track Classes
UI
StateMachineToolkit.dll
csharpmiditoolkitv5_demo.zip
CSharpMidiToolkitV5_demo
MidiWatcher
Properties
Settings.settings
Sanford.Collections.dll
Sanford.Multimedia.dll
Sanford.Multimedia.Midi
Clocks
Device Classes
InputDevice Class
OutputDevice Classes
Messages
EventArgs
Message Builders
Processing
Sanford.Multimedia.Midi.csproj.user
Sequencing
Track Classes
UI
Sanford.Multimedia.Timers.dll
Sanford.Threading.dll
SequencerDemo
Properties
Settings.settings
miditoolkit_demo.zip
CSharpMidiToolkit
MidiToolkitDemo
App.ico
MidiToolkitDemo.csproj.user
Multimedia
Multimedia.csproj.user
Multimedia.Midi
Devices
Messages
Message Adaptors
MIDI File
Multimedia.MIDI.csproj.user
Sequencing
Synchronization
UI
miditoolkit_src.zip
MidiToolkit_src
Devices
Messages
MIDI File
Sequencing
TickGenerators
UI
using System;
using System.Collections;
using System.ComponentModel;
using System.Drawing;
using System.Data;
using System.Windows.Forms;

namespace Multimedia.Midi.UI
{
	/// <summary>
	/// Provides functionality for choosing Midi notes.
	/// </summary>
	public class NoteSelector : UserControl
	{
        #region NoteSelector Members

        #region Constants

        // Note per octave.
        private const int NotePerOctave = 12;

        // Maximum octave value.
        private const int OctaveMax = 10;

        #endregion

        #region Fields

        private System.Windows.Forms.Label lblNote;
        private System.Windows.Forms.ComboBox cboNote;
        private System.Windows.Forms.ComboBox cboOctave;
        private System.Windows.Forms.Label lblOctave;
		/// <summary> 
		/// Required designer variable.
		/// </summary>
		private System.ComponentModel.Container components = null;

        #endregion

        #region Events

        /// <summary>
        /// Occurs when the note number has changed.
        /// </summary>
        public event EventHandler NoteNumberChanged;

        #endregion

        #region Construction

        /// <summary>
        /// Initializes a new instance of the NoteSelector class.
        /// </summary>
		public NoteSelector()
		{
			// This call is required by the Windows.Forms Form Designer.
			InitializeComponent();

            // Initialize note number;
            NoteNumber = 0;
		}

        #endregion

        #region Methods

		/// <summary> 
		/// Clean up any resources being used.
		/// </summary>
		protected override void Dispose( bool disposing )
		{
			if( disposing )
			{
				if(components != null)
				{
					components.Dispose();
				}
			}
			base.Dispose( disposing );
		}

		#region Component Designer generated code
		/// <summary> 
		/// Required method for Designer support - do not modify 
		/// the contents of this method with the code editor.
		/// </summary>
		private void InitializeComponent()
		{
            this.lblNote = new System.Windows.Forms.Label();
            this.cboNote = new System.Windows.Forms.ComboBox();
            this.cboOctave = new System.Windows.Forms.ComboBox();
            this.lblOctave = new System.Windows.Forms.Label();
            this.SuspendLayout();
            // 
            // lblNote
            // 
            this.lblNote.Location = new System.Drawing.Point(8, 8);
            this.lblNote.Name = "lblNote";
            this.lblNote.Size = new System.Drawing.Size(32, 16);
            this.lblNote.TabIndex = 0;
            this.lblNote.Text = "Note";
            this.lblNote.TextAlign = System.Drawing.ContentAlignment.BottomCenter;
            // 
            // cboNote
            // 
            this.cboNote.DropDownStyle = System.Windows.Forms.ComboBoxStyle.DropDownList;
            this.cboNote.Items.AddRange(new object[] {
                                                         "C",
                                                         "C#",
                                                         "D",
                                                         "D#",
                                                         "E",
                                                         "F",
                                                         "F#",
                                                         "G",
                                                         "G#",
                                                         "A",
                                                         "A#",
                                                         "B"});
            this.cboNote.Location = new System.Drawing.Point(8, 32);
            this.cboNote.Name = "cboNote";
            this.cboNote.Size = new System.Drawing.Size(40, 21);
            this.cboNote.TabIndex = 1;
            this.cboNote.SelectedIndexChanged += new System.EventHandler(this.cboNote_SelectedIndexChanged);
            // 
            // cboOctave
            // 
            this.cboOctave.DropDownStyle = System.Windows.Forms.ComboBoxStyle.DropDownList;
            this.cboOctave.Items.AddRange(new object[] {
                                                           "-1",
                                                           "0",
                                                           "1",
                                                           "2",
                                                           "3",
                                                           "4",
                                                           "5",
                                                           "6",
                                                           "7",
                                                           "8",
                                                           "9"});
            this.cboOctave.Location = new System.Drawing.Point(64, 32);
            this.cboOctave.Name = "cboOctave";
            this.cboOctave.Size = new System.Drawing.Size(40, 21);
            this.cboOctave.TabIndex = 3;
            this.cboOctave.SelectedIndexChanged += new System.EventHandler(this.cboOctave_SelectedIndexChanged);
            // 
            // lblOctave
            // 
            this.lblOctave.Location = new System.Drawing.Point(64, 10);
            this.lblOctave.Name = "lblOctave";
            this.lblOctave.Size = new System.Drawing.Size(40, 16);
            this.lblOctave.TabIndex = 2;
            this.lblOctave.Text = "Octave";
            this.lblOctave.TextAlign = System.Drawing.ContentAlignment.BottomCenter;
            // 
            // NoteSelector
            // 
            this.Controls.Add(this.cboOctave);
            this.Controls.Add(this.lblOctave);
            this.Controls.Add(this.cboNote);
            this.Controls.Add(this.lblNote);
            this.Name = "NoteSelector";
            this.Size = new System.Drawing.Size(120, 64);
            this.ResumeLayout(false);

        }
		#endregion

        // Note selection change handler.
        private void cboNote_SelectedIndexChanged(object sender, System.EventArgs e)
        { 
            // If the note is set above G.
            if(cboNote.SelectedIndex > (int)Note.G)
            {
                // If the octave range extends to the maximum octave value.
                if(cboOctave.Items.Count - 1 == OctaveMax)
                {
                    // Remove highest octave. This prevents a note value above
                    // 127 (maximum Midi note number) from being chosen.
                    cboOctave.Items.Remove("9");
                }
            }
            // Else the note is set at G or below.
            else
            {
                // If the highest octave value has been removed.
                if(cboOctave.Items.Count - 1 < OctaveMax)
                {
                    // Add the highest octave value back.
                    cboOctave.Items.Add("9");
                }
            }

            // If anyone is listening for the note number to change.
            if(NoteNumberChanged != null)
            {
                NoteNumberChanged(this, new EventArgs());
            }
        }

        // Octave selection change handler.
        private void cboOctave_SelectedIndexChanged(object sender, System.EventArgs e)
        {
            // If the octave is set to the highest value.
            if(cboOctave.SelectedIndex == OctaveMax)
            {
                // If the note range extends beyond note G.
                if(cboNote.Items.Count - 1 > (int)Note.G)
                {
                    //
                    // Remove notes above G. This prevents a note value above
                    // 127 (maximum Midi note number) from being chosen.
                    //

                    cboNote.Items.Remove("G#");
                    cboNote.Items.Remove("A");
                    cboNote.Items.Remove("A#");
                    cboNote.Items.Remove("B");
                }
            }
            // Else the octave is set below the highest value.
            else
            {
                // If the notes above G have been removed.
                if(cboNote.Items.Count - 1 < (int)Note.GSharp)
                {
                    //
                    // Add the note back.
                    // 

                    cboNote.Items.Add("G#");
                    cboNote.Items.Add("A");
                    cboNote.Items.Add("A#");
                    cboNote.Items.Add("B");
                }
            }

            // If anyone is listening for the note number to change.
            if(NoteNumberChanged != null)
            {
                NoteNumberChanged(this, new EventArgs());
            }        
        }

        #endregion

        #region Properties

        /// <summary>
        /// Gets or sets the note number.
        /// </summary>
        public int NoteNumber
        {
            get
            {
                int octave = cboOctave.SelectedIndex;
                int note = cboNote.SelectedIndex;

                return octave * NotePerOctave + note;
            }
            set
            {
                // Enforce preconditions.
                if(value < 0 || value > ShortMessage.DataValueMax)
                    throw new ArgumentOutOfRangeException("NoteNumber", value,
                        "Note number out of range.");

                int octave = value / NotePerOctave;
                int note = value - NotePerOctave * octave;
                    
                // Remove event handler to prevent the NoteNumberChanged 
                // event from being triggered twice.
                cboOctave.SelectedIndexChanged -= 
                    new EventHandler(cboOctave_SelectedIndexChanged);

                cboOctave.SelectedIndex = octave;

                // Add event handler back.
                cboOctave.SelectedIndexChanged += 
                    new EventHandler(cboOctave_SelectedIndexChanged);

                cboNote.SelectedIndex = note;
            }
        }

        #endregion

        #endregion
	}
}

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This article, along with any associated source code and files, is licensed under The MIT License

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About the Author

Leslie Sanford

United States United States
Aside from dabbling in BASIC on his old Atari 1040ST years ago, Leslie's programming experience didn't really begin until he discovered the Internet in the late 90s. There he found a treasure trove of information about two of his favorite interests: MIDI and sound synthesis.
 
After spending a good deal of time calculating formulas he found on the Internet for creating new sounds by hand, he decided that an easier way would be to program the computer to do the work for him. This led him to learn C. He discovered that beyond using programming as a tool for synthesizing sound, he loved programming in and of itself.
 
Eventually he taught himself C++ and C#, and along the way he immersed himself in the ideas of object oriented programming. Like many of us, he gotten bitten by the design patterns bug and a copy of GOF is never far from his hands.
 
Now his primary interest is in creating a complete MIDI toolkit using the C# language. He hopes to create something that will become an indispensable tool for those wanting to write MIDI applications for the .NET framework.
 
Besides programming, his other interests are photography and playing his Les Paul guitars.

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