CODEWITHSUNDEEP
c#windows-phone-7
ebolton
ebolton

Reputation: 1146

Redo Undo drawing Canvas WP7

Doing some work on a Drawing Canvas and I'm wanting to implement a Redo and Undo button. I tried with a stack and an array, placing the last point drawn into the array then calling it back or deleting it but I cant seem to get it to work. Any documentation on this? Thanks in advance.

To comment bellow here is what I'm talking about 

this.ContentPanelCanvas.Children.Add(line);
                oldPoint = currentPoint;
                Point[] redoTest = { oldPoint };

the above is what i tried to store the Oldpoint..

Later to recall that point and undo it I tried this: 

private void Redo_Click(object sender, EventArgs e)
        {
            ContentPanelCanvas.Children.Remove(redoTest);
        }

That gives me an error though. Whats wrong with it?

Upvotes: 0

Views: 1000

Answers (1)

Paul Diston
Paul Diston

Reputation: 3294

You may find the following sample meets your needs, it includes a method called undoLast, which will earse the last line drawn :-

http://www.windowsphonegeek.com/tips/WP7-DrawingBoard-sample-Drawing--Ink--made-easy

Add the following line to a new undo button click event handler :-

myBoard.undoLast(SimzzDev.DrawingBoard.PenMode.pen);

Upvotes: 1

Related Questions