/// <summary>
/// Restore selection to its state before change.
/// </summary>
public override void Undo(DrawingCanvas drawingCanvas)
{
// Replace all objects in the list with objects from listBefore
ReplaceObjects(drawingCanvas.GraphicsList, listBefore);
drawingCanvas.RefreshClip();
}
/// <summary>
/// Add all deleted objects to GraphicsList
/// </summary>
public override void Undo(DrawingCanvas drawingCanvas)
{
foreach (PropertiesGraphicsBase o in cloneList)
{
drawingCanvas.GraphicsList.Add(o.CreateGraphics());
}
drawingCanvas.RefreshClip();
}
/// <summary>
/// Add object again
/// </summary>
public override void Redo(DrawingCanvas drawingCanvas)
{
HelperFunctions.UnselectAll(drawingCanvas);
// Create full object from the clone and add it to list
drawingCanvas.GraphicsList.Add(newObjectClone.CreateGraphics());
// Object created from the clone doesn't contain clip information,
// refresh it.
drawingCanvas.RefreshClip();
}
/// <summary>
/// Restore deleted objects
/// </summary>
public override void Undo(DrawingCanvas drawingCanvas)
{
// Insert all objects from cloneList to GraphicsList
int currentIndex = 0;
int indexToInsert;
foreach (PropertiesGraphicsBase o in cloneList)
{
indexToInsert = indexes[currentIndex];
if ( indexToInsert >=0 && indexToInsert <= drawingCanvas.GraphicsList.Count ) // "<=" is correct !
{
drawingCanvas.GraphicsList.Insert(indexToInsert, o.CreateGraphics());
}
else
{
// Bug: we should not be here.
// Add to the end anyway.
drawingCanvas.GraphicsList.Add(o.CreateGraphics());
System.Diagnostics.Trace.WriteLine("CommandDelete.Undo - incorrect index");
}
currentIndex++;
}
drawingCanvas.RefreshClip();
}