void Add(Command cmd)
{
if (pos < stack.Count) {
stack.RemoveRange(pos, stack.Count - pos);
}
System.Diagnostics.Trace.WriteLine(cmd.Name);
stack.Add(cmd);
if (stack.Count > this.max) {
stack.RemoveAt(0);
} else {
pos++;
}
}
public CommandEventArgs(Command cmd)
{
this.cmd = cmd;
}
public Command Undo()
{
if (pos>0){
pos--;
Command cmd = this.Current;
if (cmd != null && !cmd.IsNoop){
Command saved = this.exec;
try {
this.exec = cmd;
cmd.Undo();
} finally {
this.exec = saved;
}
if (StateChanged != null) {
StateChanged(this, EventArgs.Empty);
}
if (CommandUndone != null) {
CommandUndone(this, new CommandEventArgs(cmd));
}
}
return cmd;
}
return null;
}
public Command Redo()
{
if (pos < stack.Count){
Command cmd = this.Current;
if (cmd != null && !cmd.IsNoop){
Command saved = this.exec;
try {
this.exec = cmd;
cmd.Redo();
} finally {
this.exec = saved;
}
if (StateChanged != null) {
StateChanged(this, new CommandEventArgs(cmd));
}
if (CommandRedone != null) {
CommandRedone(this, new CommandEventArgs(cmd));
}
}
pos++;
return cmd;
}
return null;
}
public void Push(Command cmd)
{
if (cmd.IsNoop) return; // do nothing!
if (this.compound != null) {
this.compound.Add(cmd);
} else {
Add(cmd);
}
// Must do command after adding it to the command stack!
Command saved = this.exec;
try {
this.exec = cmd;
cmd.Do();
} finally {
this.exec = saved;
}
if (StateChanged != null) {
StateChanged(this, EventArgs.Empty);
}
if (CommandDone != null) {
CommandDone(this, new CommandEventArgs(cmd));
}
}
public void Insert(Command cmd)
{
commands.Insert(0, cmd);
}
public void Add(Command cmd)
{
commands.Add(cmd);
}