public override 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;
DrawObject objectToDelete = list[i];
foreach(DrawObject o in cloneList)
{
if ( objectToDelete.ID == o.ID )
{
toDelete = true;
break;
}
}
if ( toDelete )
{
list.RemoveAt(i);
}
}
}
public override void Undo(GraphicsList list)
{
// Add all objects from clone list to list -
// opposite to DeleteAll
foreach (DrawObject o in cloneList)
{
list.Add(o);
}
}
// Fill list from selection
private void FillList(GraphicsList graphicsList, ref List<DrawObject> listToFill)
{
listToFill = new List<DrawObject>();
foreach (DrawObject o in graphicsList.Selection)
{
listToFill.Add(o.Clone());
}
}
public override void Undo(GraphicsList list)
{
list.UnselectAll();
// Add all objects from cloneList to list.
foreach(DrawObject o in cloneList)
{
list.Add(o);
}
}
List<DrawObject> cloneList; // contains selected items which are deleted
// Create this command BEFORE applying Delete All function.
public CommandDelete(GraphicsList graphicsList)
{
cloneList = new List<DrawObject>();
// Make clone of the list selection.
foreach(DrawObject o in graphicsList.Selection)
{
cloneList.Add(o.Clone());
}
}
// Create this command BEFORE applying Delete All function.
public CommandDeleteAll(GraphicsList graphicsList)
{
cloneList = new List<DrawObject>();
// 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<DrawObject> list)
{
for ( int i = 0; i < graphicsList.Count; i++ )
{
DrawObject replacement = null;
foreach(DrawObject o in list)
{
if ( o.ID == graphicsList[i].ID )
{
replacement = o;
break;
}
}
if ( replacement != null )
{
graphicsList.Replace(i, replacement);
}
}
}
public override void Redo(GraphicsList list)
{
list.UnselectAll();
list.Add(drawObject);
}
public override void Undo(GraphicsList list)
{
list.DeleteLastAddedObject();
}
public override void Redo(GraphicsList list)
{
// Clear list - make DeleteAll again
list.Clear();
}
// Create this command BEFORE operation.
public CommandChangeState(GraphicsList graphicsList)
{
// Keep objects state before operation.
FillList(graphicsList, ref listBefore);
}
public override void Redo(GraphicsList list)
{
// Replace all objects in the list with objects from listAfter
ReplaceObjects(list, listAfter);
}
public override 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);
}
/// <summary>
/// Initialization
/// </summary>
/// <param name="owner"></param>
/// <param name="docManager"></param>
public void Initialize(MainForm owner, DocManager docManager)
{
SetStyle(ControlStyles.AllPaintingInWmPaint |
ControlStyles.UserPaint | ControlStyles.OptimizedDoubleBuffer, true);
// Keep reference to owner form
this.Owner = owner;
this.DocManager = docManager;
// set default tool
activeTool = DrawToolType.Pointer;
// create list of graphic objects
graphicsList = new GraphicsList();
// Create undo manager
undoManager = new UndoManager(graphicsList);
// create array of drawing tools
tools = new Tool[(int)DrawToolType.NumberOfDrawTools];
tools[(int)DrawToolType.Pointer] = new ToolPointer();
tools[(int)DrawToolType.Rectangle] = new ToolRectangle();
tools[(int)DrawToolType.Ellipse] = new ToolEllipse();
tools[(int)DrawToolType.Line] = new ToolLine();
tools[(int)DrawToolType.Polygon] = new ToolPolygon();
}
// This command is used to make Redo operation. // It makes original command again. public abstract void Redo(GraphicsList list);
public UndoManager(GraphicsList graphicsList)
{
this.graphicsList = graphicsList;
ClearHistory();
}