lyfz_repos/铂金版源码/LYFZ.NeroDiscBurn/SpeedComboBox.cs

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

namespace LYFZ.NeroDiscBurn.NET
{
	// This is a reusable class derived from ComboBox meant
	// to display both read and write speeds.
	// 
	public class SpeedComboBox : System.Windows.Forms.ComboBox
	{
		// This is a private class that represents an item
		// of the combobox. We use it to store both textual
		// repesentation as well as the actual integer value.
		// 
		public class CBItem
		{
			public string m_sItem;
			public int m_iSpeed;

			public CBItem (string sItem, int iSpeed)
			{
				m_sItem = sItem;
				m_iSpeed = iSpeed;
			}

			public override string ToString()
			{
				return m_sItem;
			}
		}

		// This is a flag that tells whether the "Maximum" speed
		// should be displayed or not.
		// 
		public bool m_bUseMaximum;

		// The contructor.
		// 
		public SpeedComboBox ()
		{
			m_bUseMaximum = true;
		}

		// Return textual representation of the currently selected
		// speed. If nothing is selected, return "Maximum" or "<none>"
		// depending on requirements.
		// 
		public new string ToString ()
		{
			return this.SelectedItem == null? (m_bUseMaximum? "Maximum": "<none>"): this.SelectedItem.ToString ();
		}

		// Get the current speed.
		// 
		public int GetSpeed ()
		{
			return this.SelectedItem == null? 0: ((CBItem) this.SelectedItem).m_iSpeed;
		}

		// Populate the combobox from the NeroSpeeds.
		// 
		public void Populate (NeroSpeeds speeds)
		{
			// First clear everything.
			// 
			this.Items.Clear ();

			// If we should add "Maximum", do it here and now.
			// 
			if (m_bUseMaximum)
			{
				this.Items.Add (new CBItem ("Maximum", 0));
			}
			else
			{
				// If we should not add "Maximum", see if there is at
				// least one speed. If not, add "<none>".
				// 
				if (speeds.Count == 0)
				{
					this.Items.Add (new CBItem ("<none>", 0));
				}
			}

			// Now, add each speed from the NeroSpeeds collection.
			// 
			foreach (int iSpeed in speeds)
			{
				float fSpeed = iSpeed/(float) speeds.BaseSpeedKBs;
				this.Items.Add (new CBItem (fSpeed.ToString () + "x (" + iSpeed.ToString () + " kb/s)", iSpeed));
			}

			// Select the first speed as default.
			// 
			this.SelectedIndex = 0;
		}
	}
}