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using System;
using System.Windows.Controls;
using System.Windows.Controls.Primitives;
using System.Windows;
namespace System.Windows.Controls.Primitives
{
/// <summary>
/// This DragDeltaEventArgs class contains additional information about the
/// DragDeltaEvent event.
/// </summary>
/// <seealso cref="Thumb.DragDeltaEvent" />
/// <seealso cref="RoutedEventArgs" />
public class DragDeltaEventArgs: RoutedEventArgs
{
/// <summary>
/// This is an instance constructor for the DragDeltaEventArgs class. It
/// is constructed with a reference to the event being raised.
/// </summary>
/// <returns>Nothing.</returns>
public DragDeltaEventArgs(double horizontalChange, double verticalChange) : base()
{
_horizontalChange = horizontalChange;
_verticalChange = verticalChange;
RoutedEvent=Thumb.DragDeltaEvent;
}
/// <value>
/// Read-only access to the horizontal change.
/// </value>
public double HorizontalChange
{
get { return _horizontalChange; }
}
/// <value>
/// Read-only access to the vertical change.
/// </value>
public double VerticalChange
{
get { return _verticalChange; }
}
/// <summary>
/// This method is used to perform the proper type casting in order to
/// call the type-safe DragDeltaEventHandler delegate for the DragDeltaEvent event.
/// </summary>
/// <param name="genericHandler">The handler to invoke.</param>
/// <param name="genericTarget">The current object along the event's route.</param>
/// <returns>Nothing.</returns>
/// <seealso cref="Thumb.DragDeltaEvent" />
/// <seealso cref="DragDeltaEventHandler" />
protected override void InvokeEventHandler(Delegate genericHandler, object genericTarget)
{
DragDeltaEventHandler handler = (DragDeltaEventHandler)genericHandler;
handler(genericTarget, this);
}
private double _horizontalChange;
private double _verticalChange;
}
/// <summary>
/// This delegate must used by handlers of the DragDeltaEvent event.
/// </summary>
/// <param name="sender">The current element along the event's route.</param>
/// <param name="e">The event arguments containing additional information about the event.</param>
/// <returns>Nothing.</returns>
public delegate void DragDeltaEventHandler(object sender, DragDeltaEventArgs e);
}
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