public void Redo(GraphicsList list)
{
// Delete from list all objects kept in cloneList
int n = list.Count;
for ( int i = n - 1; i >= 0; i-- )
{
bool toDelete = false;
IDrawObject objectToDelete = list[i];
foreach(IDrawObject o in cloneList)
{
if (objectToDelete.Property.Id == o.Property.Id)
{
toDelete = true;
break;
}
}
if ( toDelete )
{
list.RemoveAt(i);
}
}
}
public void Undo(GraphicsList list)
{
// Add all objects from clone list to list -
// opposite to DeleteAll
foreach (IDrawObject o in cloneList)
{
list.Add(o);
}
}
// Fill list from selection
private void FillList(GraphicsList graphicsList, ref List<IDrawObject> listToFill)
{
listToFill = new List<IDrawObject>();
foreach (IDrawObject o in graphicsList.Selection)
{
listToFill.Add(o.Clone());
}
}
public void Undo(GraphicsList list)
{
list.UnselectAll();
// Add all objects from cloneList to list.
foreach(IDrawObject o in cloneList)
{
list.Add(o);
}
}
List<IDrawObject> cloneList; // contains selected items which are deleted
// Create this command BEFORE applying Delete All function.
public TrackDelete(GraphicsList graphicsList)
{
cloneList = new List<IDrawObject>();
// Make clone of the list selection.
foreach(IDrawObject o in graphicsList.Selection)
{
cloneList.Add(o.Clone());
}
}
// Create this command BEFORE applying Delete All function.
public TrackDeleteAll(GraphicsList graphicsList)
{
cloneList = new List<IDrawObject>();
// Make clone of the whole list.
// Add objects in reverse order because GraphicsList.Add
// insert every object to the beginning.
int n = graphicsList.Count;
for ( int i = n - 1; i >= 0; i-- )
{
cloneList.Add(graphicsList[i].Clone());
}
}
// Replace objects in graphicsList with objects from list
private void ReplaceObjects(GraphicsList graphicsList, List<IDrawObject> list)
{
for ( int i = 0; i < graphicsList.Count; i++ )
{
IDrawObject replacement = null;
foreach (IDrawObject o in list)
{
if (o.Property.Id == graphicsList[i].Property.Id)
{
replacement = o;
break;
}
}
if ( replacement != null )
{
graphicsList.Replace(i, replacement);
}
}
}
private void Init()
{
SetStyle(ControlStyles.AllPaintingInWmPaint |
ControlStyles.UserPaint |
ControlStyles.OptimizedDoubleBuffer |
ControlStyles.SupportsTransparentBackColor |
ControlStyles.Opaque, true);
ActiveToolBox = ToolBoxType.Pointer;
GraphicsCollection = new GraphicsList();
}
public void Redo(GraphicsList list)
{
// Replace all objects in the list with objects from listAfter
ReplaceObjects(list, listAfter);
}
public void Undo(GraphicsList list)
{
// Replace all objects in the list with objects from listBefore
ReplaceObjects(list, listBefore);
}
// Call this function AFTER operation.
public void NewState(GraphicsList graphicsList)
{
// Keep objects state after operation.
FillList(graphicsList, ref listAfter);
}
// Create this command BEFORE operation.
public TrackChangeState(GraphicsList graphicsList)
{
// Keep objects state before operation.
FillList(graphicsList, ref listBefore);
}
public void Redo(GraphicsList list)
{
// Clear list - make DeleteAll again
list.Clear();
}
public void Redo(GraphicsList list)
{
list.UnselectAll();
list.Add(drawObject);
}
public void Undo(GraphicsList list)
{
list.DeleteLastAddedObject();
}