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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
using System;
using System.Windows.Controls;
using System.Windows.Controls.Primitives;
using System.Windows;
namespace System.Windows.Controls.Primitives
{
/// <summary>
/// This DragStartedEventArgs class contains additional information about the
/// DragStarted event.
/// </summary>
/// <seealso cref="Thumb.DragStartedEvent" />
/// <seealso cref="RoutedEventArgs" />
public class DragStartedEventArgs: RoutedEventArgs
{
/// <summary>
/// This is an instance constructor for the DragStartedEventArgs class. It
/// is constructed with a reference to the event being raised.
/// </summary>
/// <returns>Nothing.</returns>
public DragStartedEventArgs(double horizontalOffset, double verticalOffset) : base()
{
_horizontalOffset = horizontalOffset;
_verticalOffset = verticalOffset;
RoutedEvent=Thumb.DragStartedEvent;
}
/// <value>
/// Read-only access to the horizontal offset (relative to Thumb's co-ordinate).
/// </value>
public double HorizontalOffset
{
get { return _horizontalOffset; }
}
/// <value>
/// Read-only access to the vertical offset (relative to Thumb's co-ordinate).
/// </value>
public double VerticalOffset
{
get { return _verticalOffset; }
}
/// <summary>
/// This method is used to perform the proper type casting in order to
/// call the type-safe DragStartedEventHandler delegate for the DragStartedEvent 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.DragStartedEvent" />
/// <seealso cref="DragStartedEventHandler" />
protected override void InvokeEventHandler(Delegate genericHandler, object genericTarget)
{
DragStartedEventHandler handler = (DragStartedEventHandler)genericHandler;
handler(genericTarget, this);
}
private double _horizontalOffset;
private double _verticalOffset;
}
/// <summary>
/// This delegate must used by handlers of the DragStarted 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 DragStartedEventHandler(object sender, DragStartedEventArgs e);
}
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