/// <summary>
/// Deletes the last stroke added to the overlay
/// </summary>
/// <param name="undoable">whether to add the deleted stroke
/// to the undo stack. True = add, false = do not add.</param>
internal void deleteLastStroke(bool undoable)
{
int count = basicOverlay.Ink.Strokes.Count;
if (count == 1) // that one count IS the leftdown stroke
{
setFeedback("No stroke to be deleted");
}
else
{
setFeedback("Last stroke deleted");
Ink inkClone = basicOverlay.Ink.Clone(); // use for undo stroke
basicOverlay.Ink.DeleteStroke(basicOverlay.Ink.Strokes[count - 2]); // delete the stroke before leftdown
Panel.Invalidate(); // invalidate the window to repaint it
// if we want this stroke to be undone, add its information to the undo stack
if (undoable)
{
Strokes last = inkClone.Strokes;
int numStroke = last.Count;
for (int i = 0; i < numStroke - 2; i++)
{
last.RemoveAt(0); // remove everything except the last stroke, which is what we want
}
last.RemoveAt(1); // remove the gesture that triggered this
undoStack.Push("");
undoStack.Push("");
undoStack.Push(last); // should only contain the last stroke now
undoStack.Push("DeleteLastStroke");
}
}
}//deleteLastStroke
/// <summary>
/// Redo image edits that were undone
/// </summary>
internal void Redo()
{
int index = redoActions.Count - 1;
if (index < 0)
{
return;
}
if (redoActions[index] == InkCanvasEditingMode.Ink)
{
Strokes.Add(redoStrokes[index]);
}
else if (redoActions[index] == InkCanvasEditingMode.EraseByStroke)
{
Strokes.RemoveAt(Strokes.Count - 1);
}
else if (redoActions[index] == InkCanvasEditingMode.None)
{
Strokes.Clear();
}
undoActions.Add(redoActions[index]);
undoStrokes.Add(redoStrokes[index]);
redoActions.RemoveAt(index);
redoStrokes.RemoveAt(index);
}
private void UndoButton_Click(object sender, RoutedEventArgs e)
{
if (Strokes == null || Strokes.Count == 0)
{
return;
}
UndoneStrokes.Add(Strokes.ElementAt(Strokes.Count - 1));
Strokes.RemoveAt(Strokes.Count - 1);
}
private void buttonUndo_Click(object sender, RoutedEventArgs e)
{
ptinfos.Clear(); // REM 清除一笔中所有点
CreateNewBitmap();
if ((geos.Count > 0))
{
strokes.RemoveAt(strokes.Count - 1); // REM 清除上一笔
geos.RemoveAt(geos.Count - 1); // REM 清除上一笔
DrawingContext dc = dv.RenderOpen();
foreach (var g in geos)
{
GeometryDrawing drawing = new GeometryDrawing(Brushes.Black, new Pen(Brushes.Black, 1), g);
dc.DrawDrawing(drawing);
}
dc.Close();
bmp.Render(dv);
}
}
/// <summary>
/// Undo edit actions performed
/// </summary>
internal void Undo()
{
int index = undoActions.Count - 1;
if (index < 0)
{
return;
}
if (undoActions[index] == InkCanvasEditingMode.Ink)
{
Strokes.RemoveAt(Strokes.Count - 1);
}
else if (undoActions[index] == InkCanvasEditingMode.EraseByStroke)
{
Strokes.Add(undoStrokes[index]);
}
else if (undoActions[index] == InkCanvasEditingMode.None)
{
for (int i = 0; i < index; i++)
{
if (undoActions[i] == InkCanvasEditingMode.Ink)
{
Strokes.Add(undoStrokes[i]);
}
else if (undoActions[i] == InkCanvasEditingMode.EraseByStroke)
{
Strokes.Remove(undoStrokes[i]);
}
else if (undoActions[i] == InkCanvasEditingMode.None)
{
Strokes.Clear();
}
}
}
redoActions.Add(undoActions[index]);
redoStrokes.Add(undoStrokes[index]);
undoActions.RemoveAt(index);
undoStrokes.RemoveAt(index);
}