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using System;
namespace System.Windows.Input
{
/// <summary>
/// The MouseWheelEventArgs describes the state of a Mouse wheel.
/// </summary>
public class MouseWheelEventArgs : MouseEventArgs
{
/// <summary>
/// Initializes a new instance of the MouseWheelEventArgs class.
/// </summary>
/// <param name="mouse">
/// The Mouse device associated with this event.
/// </param>
/// <param name="timestamp">
/// The time when the input occured.
/// </param>
/// <param name="delta">
/// How much the mouse wheel turned.
/// </param>
public MouseWheelEventArgs(MouseDevice mouse, int timestamp, int delta) : base(mouse, timestamp)
{
_delta = delta;
}
/// <summary>
/// Read-only access to the amount the mouse wheel turned.
/// </summary>
public int Delta
{
get {return _delta;}
}
/// <summary>
/// The mechanism used to call the type-specific handler on the
/// target.
/// </summary>
/// <param name="genericHandler">
/// The generic handler to call in a type-specific way.
/// </param>
/// <param name="genericTarget">
/// The target to call the handler on.
/// </param>
protected override void InvokeEventHandler(Delegate genericHandler, object genericTarget)
{
MouseWheelEventHandler handler = (MouseWheelEventHandler) genericHandler;
handler(genericTarget, this);
}
private static int _delta;
}
}
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