public CommandResolver()
{
m_CommandList = new FRList<PtCommand>();
m_SelectCmd = PtApp.Get().GetCommand("SelectCmd");
if (m_SelectCmd != null) m_SelectCmd.OnCommand();
}
// There are two kinds of command
// 1. Database command, It will change the database. Such as create line, circle.
// 2. Non-database command, It won¡¯t change the database. Such as view commands.
//
// Currently, we only support 2-depth command nested. It means there are
// two commands in the stack at most. Their combination is [db cmd, non-db cmd].
//
// The following work flow is used to process the nested commands.
// 1. If the command stack isn¡¯t empty.
// A) If the new command is database command, terminate all the commands,
// including all the database command and non-database command, in the stack.
// Such as [Line (, Pan)] ->Circle => [Circle].
// B) If the new command is non-database command, terminate all the
// non-database commands in the stack if there is. The database command will be left
// if there is. Such as [(Line ,) Pan] ->Zoom =>[(Line,) Zoom].
//
// 2. Active this command and add it to the stack.
//
//
// The entry of all the commands
public void OnCommand(PtCommand Command)
{
if(!m_CommandList.Empty())
{
if (Command.IsDatabaseCommand)
TerminateAllStackCommands();
else
TerminateNonDatabaseCommands();
}
// Start the command
bool bSuc = Command.OnCommand();
if (!bSuc)
Command.Terminate();
else
m_CommandList.Add(Command);
}
