InkCanvasSelectionHitResult Enum

Reference

Definition

Namespace:: System.Windows.Controls

Assembly:: PresentationFramework.dll

Important

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Identifies the various parts of a selection adorner on an InkCanvas.

public enum class InkCanvasSelectionHitResult

public enum InkCanvasSelectionHitResult

type InkCanvasSelectionHitResult =

Public Enum InkCanvasSelectionHitResult

Inheritance: Object

ValueType

Enum
InkCanvasSelectionHitResult

Fields

Name	Value	Description
None	0	No part of the selection adorner.
TopLeft	1	The upper left handle of the selection adorner.
Top	2	The upper middle handle of the selection adorner.
TopRight	3	The upper right handle of the selection adorner.
Right	4	The middle handle on the right edge of the selection adorner.
BottomRight	5	The lower right handle of the selection adorner.
Bottom	6	The lower middle handle of the selection adorner.
BottomLeft	7	The lower left handle of the selection adorner.
Left	8	The middle handle on the left edge of the selection adorner.
Selection	9	The area within the bounds of the selection adorner.

Examples

The following example demonstrates how use HitTestSelection to determine whether to create a DataObject to initiate drag and drop. To implement drag and drop between two InkCanvas objects, see How to: Drag and Drop Ink.

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

Remarks

The HitTestSelection method returns an InkCanvasSelectionHitResult to indicate which part of the selection adorner intersects or surrounds a Point. This is useful when performing drag-and-drop operations.

XAML Text Usage

This class is not typically used in XAML.

Applies to

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