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MidiInternalClock.cs
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MidiInternalClock.cs
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#region License
/* Copyright (c) 2006 Leslie Sanford
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to
* deal in the Software without restriction, including without limitation the
* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
* sell copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#endregion
#region Contact
/*
* Leslie Sanford
* Email: jabberdabber@hotmail.com
*/
#endregion
using System;
using System.Collections.Generic;
using System.ComponentModel;
using Sanford.Multimedia.Timers;
namespace Sanford.Multimedia.Midi
{
/// <summary>
/// Generates clock events internally.
/// </summary>
public class MidiInternalClock : PpqnClock, IComponent
{
#region MidiInternalClock Members
#region Fields
// Used for generating tick events.
private ITimer timer;
// Parses meta message tempo change messages.
private TempoChangeBuilder builder = new TempoChangeBuilder();
// Tick accumulator.
private int ticks = 0;
// Indicates whether the clock has been disposed.
private bool disposed = false;
private ISite site = null;
#endregion
#region Construction
/// <summary>
/// Initializes a new instance of the MidiInternalClock class.
/// </summary>
public MidiInternalClock()
: this(TimerCaps.Default.periodMin)
{
}
public MidiInternalClock(int timerPeriod) : base(timerPeriod)
{
timer = TimerFactory.Create();
timer.Period = timerPeriod;
timer.Tick += new EventHandler(HandleTick);
}
/// <summary>
/// Initializes a new instance of the MidiInternalClock class with the
/// specified IContainer.
/// </summary>
/// <param name="container">
/// The IContainer to which the MidiInternalClock will add itself.
/// </param>
public MidiInternalClock(IContainer container) :
this()
{
///
/// Required for Windows.Forms Class Composition Designer support
///
container.Add(this);
}
#endregion
#region Methods
/// <summary>
/// Starts the MidiInternalClock.
/// </summary>
public void Start()
{
#region Require
if(disposed)
{
throw new ObjectDisposedException("MidiInternalClock");
}
#endregion
#region Guard
if(running)
{
return;
}
#endregion
ticks = 0;
Reset();
OnStarted(EventArgs.Empty);
// Start the multimedia timer in order to start generating ticks.
timer.Start();
// Indicate that the clock is now running.
running = true;
}
/// <summary>
/// Resumes tick generation from the current position.
/// </summary>
public void Continue()
{
#region Require
if(disposed)
{
throw new ObjectDisposedException("MidiInternalClock");
}
#endregion
#region Guard
if(running)
{
return;
}
#endregion
// Raise Continued event.
OnContinued(EventArgs.Empty);
// Start multimedia timer in order to start generating ticks.
timer.Start();
// Indicate that the clock is now running.
running = true;
}
/// <summary>
/// Stops the MidiInternalClock.
/// </summary>
public void Stop()
{
#region Require
if(disposed)
{
throw new ObjectDisposedException("MidiInternalClock");
}
#endregion
#region Guard
if(!running)
{
return;
}
#endregion
// Stop the multimedia timer.
timer.Stop();
// Indicate that the clock is not running.
running = false;
OnStopped(EventArgs.Empty);
}
public void SetTicks(int ticks)
{
#region Require
if(ticks < 0)
{
throw new ArgumentOutOfRangeException();
}
#endregion
if(IsRunning)
{
Stop();
}
this.ticks = ticks;
Reset();
}
public void Process(MetaMessage message)
{
#region Require
if(message == null)
{
throw new ArgumentNullException("message");
}
#endregion
#region Guard
if(message.MetaType != MetaType.Tempo)
{
return;
}
#endregion
TempoChangeBuilder builder = new TempoChangeBuilder(message);
// Set the new tempo.
Tempo = builder.Tempo;
}
#region Event Raiser Methods
protected virtual void OnDisposed(EventArgs e)
{
EventHandler handler = Disposed;
if(handler != null)
{
handler(this, e);
}
}
#endregion
#region Event Handler Methods
// Handles Tick events generated by the multimedia timer.
private void HandleTick(object sender, EventArgs e)
{
int t = GenerateTicks();
for(int i = 0; i < t; i++)
{
OnTick(EventArgs.Empty);
ticks++;
}
}
#endregion
#endregion
#region Properties
/// <summary>
/// Gets or sets the tempo in microseconds per beat.
/// </summary>
public int Tempo
{
get
{
#region Require
if(disposed)
{
throw new ObjectDisposedException("MidiInternalClock");
}
#endregion
return GetTempo();
}
set
{
#region Require
if(disposed)
{
throw new ObjectDisposedException("MidiInternalClock");
}
#endregion
SetTempo(value);
}
}
public override int Ticks
{
get
{
return ticks;
}
}
#endregion
#endregion
#region IComponent Members
public event EventHandler Disposed;
public ISite Site
{
get
{
return site;
}
set
{
site = value;
}
}
#endregion
#region IDisposable Members
public void Dispose()
{
#region Guard
if(disposed)
{
return;
}
#endregion
if(running)
{
// Stop the multimedia timer.
timer.Stop();
}
disposed = true;
timer.Dispose();
GC.SuppressFinalize(this);
OnDisposed(EventArgs.Empty);
}
#endregion
}
}