InkPicture.StrokesDeleting 事件

發行項
10/29/2008

會在從 InkPicture 控制項的 Ink 屬性刪除 Stroke 物件之前發生。

命名空間： Microsoft.Ink
組件： Microsoft.Ink (在 Microsoft.Ink.dll 中)

語法

'宣告
Public Event StrokesDeleting As InkOverlayStrokesDeletingEventHandler
'用途
Dim instance As InkPicture
Dim handler As InkOverlayStrokesDeletingEventHandler

AddHandler instance.StrokesDeleting, handler

public event InkOverlayStrokesDeletingEventHandler StrokesDeleting

public:
 event InkOverlayStrokesDeletingEventHandler^ StrokesDeleting {
    void add (InkOverlayStrokesDeletingEventHandler^ value);
    void remove (InkOverlayStrokesDeletingEventHandler^ value);
}

/** @event */
public void add_StrokesDeleting (InkOverlayStrokesDeletingEventHandler value)
/** @event */
public void remove_StrokesDeleting (InkOverlayStrokesDeletingEventHandler value)

JScript 不支援事件。

備註

事件處理常式會收到 InkOverlayStrokesDeletingEventArgs 型別的引數，其中包含這個事件的相關資料。

在建立 InkOverlayStrokesDeletingEventHandler 委派時，您要識別處理事件的方法。若要使事件與您的事件處理常式產生關聯，請將委派的執行個體加入至事件。除非您移除委派，否則每當事件發生時就會呼叫事件處理常式。基於效能考量，相關事件的預設是關閉的，但會在您加入事件處理常式時自動開啟。

範例

這個範例會示範如何訂閱 StrokesDeleting 事件，讓您還原最後刪除的筆劃。

當 StrokesDeleting 事件引發時，會儲存即將刪除的 Stroke 物件。

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());
}

為回應使用者動作，例如按一下 MenuItem (英文)，先前已刪除的 Stroke 物件會重新加入至原始的 Ink 物件。

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();
}