InkOverlayStrokesDeletingEventHandler 委托

表示处理 InkOverlay 对象的 StrokesDeleting 事件的方法。

命名空间：  Microsoft.Ink
程序集：  Microsoft.Ink（在 Microsoft.Ink.dll 中）

语法

声明
Public Delegate Sub InkOverlayStrokesDeletingEventHandler ( _
    sender As Object, _
    e As InkOverlayStrokesDeletingEventArgs _
)
用法
Dim instance As New InkOverlayStrokesDeletingEventHandler(AddressOf HandlerMethod)

public delegate void InkOverlayStrokesDeletingEventHandler(
    Object sender,
    InkOverlayStrokesDeletingEventArgs e
)

public delegate void InkOverlayStrokesDeletingEventHandler(
    Object^ sender, 
    InkOverlayStrokesDeletingEventArgs^ e
)

/** @delegate */
public delegate void InkOverlayStrokesDeletingEventHandler(
    Object sender,
    InkOverlayStrokesDeletingEventArgs e
)

JScript 不支持委托。

参数

• sender
  类型：System.Object
  此事件的源 InkOverlay 对象。

• e
  类型：Microsoft.Ink.InkOverlayStrokesDeletingEventArgs
  包含事件数据的 InkOverlayStrokesDeletingEventArgs 对象。

备注

从 InkOverlay.Ink 属性中删除 Stroke 对象之前将发生 StrokesDeleting 事件。

创建 InkOverlayStrokesDeletingEventHandler 委托时，需要标识将处理该事件的方法。若要将该事件与事件处理程序关联，请将该委托的一个实例添加到事件中。除非移除了该委托，否则每当发生该事件时就会调用此事件处理程序。出于性能方面的原因，默认事件关注在托管代码 中处于关闭状态，但如果添加事件处理程序，它将自动打开。

示例

此示例演示如何订阅 StrokesDeleting 事件，以使您能够还原最后一个删除的笔画。

激发 StrokesDeleting 事件时，将保存即将删除的 Stroke 对象。

Private Sub mInkObject_StrokesDeleting(ByVal sender As Object, ByVal e As InkOverlayStrokesDeletingEventArgs)
    ' Store strokes for later undo. They must be stored in
    ' a separate Ink object. 
    mInkDeleted = New Ink()
    mInkDeleted.AddStrokesAtRectangle(e.StrokesToDelete, e.StrokesToDelete.GetBoundingBox())
End Sub

private void mInkObject_StrokesDeleting(object sender, InkOverlayStrokesDeletingEventArgs e)
{
    // Store strokes for later undo. They must be stored in
    // a separate Ink object. 
    mInkDeleted = new Ink();
    mInkDeleted.AddStrokesAtRectangle(e.StrokesToDelete, e.StrokesToDelete.GetBoundingBox());
}

为响应用户操作（比如单击 MenuItem），以前删除的 Stroke 对象将添加回原始 Ink 对象。

If Not mInkDeleted Is Nothing Then
    ' Add strokes back.  (You need to use Ink.AddStrokesAtRectangle as opposed
    ' to Strokes.Add because you are dealing with two different Ink objects.)
    mInkObject.Ink.AddStrokesAtRectangle(mInkDeleted.Strokes, mInkDeleted.Strokes.GetBoundingBox())
    mInkDeleted = Nothing
    ' For best performance, you should Invalidate the rectangle created by the 
    ' bounding box (converted from ink space to pixel space).  For simplicity,
    ' we will just refresh the entire control.
    Refresh()
End If

if (mInkDeleted != null)
{
    // Add strokes back.  (You need to use Ink.AddStrokesAtRectangle as opposed
    // to Strokes.Add because you are dealing with two different Ink objects.)
    mInkObject.Ink.AddStrokesAtRectangle(mInkDeleted.Strokes, mInkDeleted.Strokes.GetBoundingBox());
    mInkDeleted = null;
    // For best performance, you should Invalidate the rectangle created by the 
    // bounding box (converted from ink space to pixel space).  For simplicity,
    // we will just refresh the entire control.
    Refresh();
}

平台

Windows Vista

.NET Framework 和 .NET Compact Framework 并不是对每个平台的所有版本都提供支持。有关支持的版本的列表，请参见.NET Framework 系统要求。

版本信息

.NET Framework

受以下版本支持：3.0

另请参见

参考

Microsoft.Ink 命名空间

InkOverlay.Ink