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using System;
using MS.Internal.PresentationCore;
namespace System.Windows.Input
{
/// <summary>
/// The MouseButton enumeration describes the buttons available on
/// the mouse device.
/// </summary>
/// <remarks>
/// You must update MouseButtonUtilities.Validate if any changes are made to this type
/// </remarks>
public enum MouseButton
{
/// <summary>
/// The left mouse button.
/// </summary>
Left,
/// <summary>
/// The middle mouse button.
/// </summary>
Middle,
/// <summary>
/// The right mouse button.
/// </summary>
Right,
/// <summary>
/// The fourth mouse button.
/// </summary>
XButton1,
/// <summary>
/// The fifth mouse button.
/// </summary>
XButton2
}
/// <summary>
/// Utility class for MouseButton
/// </summary>
internal sealed class MouseButtonUtilities
{
/// <summary>
/// Private placeholder constructor
/// </summary>
/// <remarks>
/// There is present to supress the autogeneration of a public one, which
/// triggers an FxCop violation, as this is an internal class that is never instantiated
/// </remarks>
private MouseButtonUtilities()
{
}
/// <summary>
/// Ensures MouseButton is set to a valid value.
/// </summary>
/// <remarks>
/// There is a proscription against using Enum.IsDefined(). (it is slow)
/// So we manually validate using a switch statement.
/// </remarks>
[FriendAccessAllowed]
internal static void Validate(MouseButton button)
{
switch(button)
{
case MouseButton.Left:
case MouseButton.Middle:
case MouseButton.Right:
case MouseButton.XButton1:
case MouseButton.XButton2:
break;
default:
throw new System.ComponentModel.InvalidEnumArgumentException("button", (int)button, typeof(MouseButton));
}
}
}
}
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