InkCanvas.HitTestSelection(Point) Method
Definition
Important
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Returns a value that indicates which part of the selection adorner intersects or surrounds the specified point.
public:
System::Windows::Controls::InkCanvasSelectionHitResult HitTestSelection(System::Windows::Point point);
public System.Windows.Controls.InkCanvasSelectionHitResult HitTestSelection (System.Windows.Point point);
member this.HitTestSelection : System.Windows.Point -> System.Windows.Controls.InkCanvasSelectionHitResult
Public Function HitTestSelection (point As Point) As InkCanvasSelectionHitResult
Parameters
- point
- Point
The point to hit test.
Returns
A value that indicates which part of the selection adorner intersects or surrounds a specified point.
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
Use the HitTestSelection method to determine whether the point is within a stroke selection's bounds or on one of the eight handles. This is useful when performing drag and drop operations.
Applies to
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