Inkcanvas StrokeErasing event

Question

I'm using an Inkcanvas at my solution. So I want to delete after user confirm, like this...

XAML:

<InkCanvas Grid.RowSpan="3" Name="ink"  StrokeErasing="ink_StrokeErasing" />

C#:

private void ink_StrokeErasing(object sender, InkCanvasStrokeErasingEventArgs e)
{
    if (MessageBox.Show("Delete this stroke?", "", MessageBoxButton.OKCancel) != MessageBoxResult.OK)
    {
        e.Cancel = true;
    }
}

After that, I can see the messagebox twice, :( This Wonder how that happened. Please let me konw about this.

score 1 · Answer 1 · answered Apr 19 '11 at 07:45

I tried to reproduce this error and used ink.EditingMode = InkCanvasEditingMode.EraseByStroke;

This only triggers the message box once.

When I use ink.EditingMode = InkCanvasEditingMode.Select; and press delete after selecting a stroke, the messagebox is not shown.

Then I used ink.EditingMode = InkCanvasEditingMode.EraseByPoint; and that caused the message box to appear multiple times because it is triggered for every single point of the stroke you are deleting.

score 0 · Answer 2 · answered Apr 20 '11 at 00:53

Thanks emo. Actually I used "InkCanvasEditingMode.EraseByStroke" and I have to use this value. :( Anyway I guess the problem is mouse focus. I changed my code like this...

private void ink_StrokeErasing(object sender, InkCanvasStrokeErasingEventArgs e)
{
    if (Mouse.LeftButton == MouseButtonState.Released) { e.Cancel = true; return; }

    if (MessageBox.Show("Delete this stroke?", "", MessageBoxButton.OKCancel) != MessageBoxResult.OK)
    {
        e.Cancel = true;
    }
}

It works fine :) I suspect that this is a bug.

Inkcanvas StrokeErasing event

2 Answers2