// Undo the last stroke
private void undo_click(object sender, RoutedEventArgs e)
{
CustomInkCanvas.CustomInkCanvas canvas = sender as CustomInkCanvas.CustomInkCanvas;
Console.WriteLine("Undo count: {0}", canvas.Strokes.Count);
int strokesDeleteIndex = canvas.Strokes.Count;
string tag = (canvas == canvasRight) ? "Blue" : "Red";
while (strokesDeleteIndex > 0)
{
if (canvas.Strokes[strokesDeleteIndex - 1].GetPropertyData(metadataGuid) as string == tag)
{
if (tag == "Blue")
{
_undoRightStrokesStack.Push(canvasLeft.Strokes[strokesDeleteIndex - 1]);
}
else
{
_undoLeftStrokesStack.Push(canvasLeft.Strokes[strokesDeleteIndex - 1]);
}
// Remove the element
canvasRight.Strokes.RemoveAt(strokesDeleteIndex - 1);
canvasLeft.Strokes.RemoveAt(strokesDeleteIndex - 1);
break;
}
strokesDeleteIndex--;
}
}
private void OnStylusPointsCollectedRight(CustomInkCanvas.CustomInkCanvas c, StylusPointCollection s)
{
Stroke stroke = new Stroke(s);
stroke.DrawingAttributes = SetAttributes(Colors.Blue);
canvasLeft.Strokes.Add(stroke);
tempStrokeCollection.Add(stroke);
}
// Redo last Undo operation
private void redo_click(object sender, RoutedEventArgs e)
{
Console.WriteLine("Redo count: {0}", canvasLeft.Strokes.Count);
CustomInkCanvas.CustomInkCanvas canvas = sender as CustomInkCanvas.CustomInkCanvas;
Stack <Stroke> undoneStrokes = (canvas == canvasLeft) ? _undoLeftStrokesStack : _undoRightStrokesStack;
int strokesCount = undoneStrokes.Count;
if (strokesCount > 0)
{
var stroke = undoneStrokes.Pop();
canvasRight.Strokes.Insert(canvasRight.Strokes.Count, stroke);
canvasLeft.Strokes.Insert(canvasLeft.Strokes.Count, stroke);
}
}
