InkCanvasSelectionHitResult 枚举

定义

命名空间:

System.Windows.Controls

程序集:

PresentationFramework.dll

在 InkCanvas 上标识选择装饰器的各个部分。

public enum class InkCanvasSelectionHitResult

public enum InkCanvasSelectionHitResult

type InkCanvasSelectionHitResult = 

Public Enum InkCanvasSelectionHitResult

继承

Object

ValueType

Enum

InkCanvasSelectionHitResult

字段

Bottom	6	选择装饰器的中部下方控点。
BottomLeft	7	选择装饰器的左下方控点。
BottomRight	5	选择装饰器的右下方控点。
Left	8	选择装饰器的左侧边缘中间的控点。
None	0	无选择装饰器的任何部分。
Right	4	选择装饰器的右侧边缘中间的控点。
Selection	9	选择装饰器边界以内的区域。
Top	2	选择装饰器的中部上方的控点。
TopLeft	1	选择装饰器的左上方控点。
TopRight	3	选择装饰器的右上方控点。

示例

以下示例演示如何使用 HitTestSelection 来确定是否创建 以 DataObject 启动拖放。 若要在两个 InkCanvas 对象之间实现拖放，请参阅 如何：拖放墨迹。

void InkCanvas_PreviewMouseDown(object sender, MouseEventArgs e)
{
    InkCanvas ic = (InkCanvas)sender;
    
    Point pt = e.GetPosition(ic);

    // If the user is moving selected strokes, prepare the strokes to be
    // moved to another InkCanvas.
    if (ic.HitTestSelection(pt) == 
        InkCanvasSelectionHitResult.Selection)
    {
        StrokeCollection selectedStrokes = ic.GetSelectedStrokes();
        StrokeCollection strokesToMove = selectedStrokes.Clone();
    
        // Remove the offset of the selected strokes so they
        // are positioned when the strokes are dropped.
        Rect inkBounds = strokesToMove.GetBounds();
        TranslateStrokes(strokesToMove, -inkBounds.X, -inkBounds.Y);
        
        // Perform drag and drop.
        MemoryStream ms = new MemoryStream();
        strokesToMove.Save(ms);
        DataObject dataObject = new DataObject(
            StrokeCollection.InkSerializedFormat, ms);
        
        DragDropEffects effects = 
            DragDrop.DoDragDrop(ic, dataObject, 
                                DragDropEffects.Move);

        if ((effects & DragDropEffects.Move) == 
             DragDropEffects.Move)
        {
            // Remove the selected strokes 
            // from the current InkCanvas.
            ic.Strokes.Remove(selectedStrokes);
        }
    }
}

Private Sub InkCanvas_PreviewMouseDown(ByVal sender As Object, _
                               ByVal e As MouseButtonEventArgs)

    Dim ic As InkCanvas = CType(sender, InkCanvas)

    Dim pt As Point = e.GetPosition(ic)

    ' If the user is moving selected strokes, prepare the strokes to be
    ' moved to another InkCanvas.
    If ic.HitTestSelection(pt) = InkCanvasSelectionHitResult.Selection Then

        Dim selectedStrokes As StrokeCollection = _
                               ic.GetSelectedStrokes()

        Dim strokesToMove As StrokeCollection = _
                             selectedStrokes.Clone()

        ' Remove the offset of the selected strokes so they
        ' are positioned when the strokes are dropped.
        Dim inkBounds As Rect = strokesToMove.GetBounds()
        TranslateStrokes(strokesToMove, -inkBounds.X, -inkBounds.Y)

        ' Perform drag and drop.
        Dim ms As New MemoryStream()
        strokesToMove.Save(ms)

        Dim dataObject As New DataObject _
            (StrokeCollection.InkSerializedFormat, ms)

        Dim effects As DragDropEffects = _
            DragDrop.DoDragDrop(ic, dataObject, DragDropEffects.Move)

        If (effects And DragDropEffects.Move) = DragDropEffects.Move Then

            ' Remove the selected strokes from the current InkCanvas.
            ic.Strokes.Remove(selectedStrokes)
        End If
    End If

End Sub

注解

方法 HitTestSelection 返回 ， InkCanvasSelectionHitResult 以指示选择装饰器中的哪个部分相交或环绕 Point。 这在执行拖放操作时很有用。

XAML 文本用法

此类通常不用于 XAML。