- if (m_currentCommand)
- {
- wxCommand *command = (wxCommand *)m_currentCommand->Data();
- if (command->CanUndo())
- {
- bool success = command->Undo();
- if (success)
- {
- m_currentCommand = m_currentCommand->Previous();
- SetMenuStrings();
- return TRUE;
- }
- }
- }
- return FALSE;
-}
-
-bool wxCommandProcessor::Redo()
-{
- wxCommand *redoCommand = (wxCommand *) NULL;
- wxNode *redoNode = (wxNode *) NULL;
- if (m_currentCommand && m_currentCommand->Next())
- {
- redoCommand = (wxCommand *)m_currentCommand->Next()->Data();
- redoNode = m_currentCommand->Next();
- }
- else
- {
- if (m_commands.Number() > 0)
- {
- redoCommand = (wxCommand *)m_commands.First()->Data();
- redoNode = m_commands.First();
- }
- }
-
- if (redoCommand)
- {
- bool success = redoCommand->Do();
- if (success)
- {
- m_currentCommand = redoNode;
- SetMenuStrings();
- return TRUE;
- }
- }
- return FALSE;
-}
-
-bool wxCommandProcessor::CanUndo() const
-{
- if (m_currentCommand)
- return ((wxCommand *)m_currentCommand->Data())->CanUndo();
- return FALSE;
-}
-
-bool wxCommandProcessor::CanRedo() const
-{
- if ((m_currentCommand != (wxNode*) NULL) && (m_currentCommand->Next() == (wxNode*) NULL))
- return FALSE;
-
- if ((m_currentCommand != (wxNode*) NULL) && (m_currentCommand->Next() != (wxNode*) NULL))
- return TRUE;
-
- if ((m_currentCommand == (wxNode*) NULL) && (m_commands.Number() > 0))
- return TRUE;
-
- return FALSE;
-}
-
-void wxCommandProcessor::Initialize()
-{
- m_currentCommand = m_commands.Last();
- SetMenuStrings();
-}
-
-void wxCommandProcessor::SetMenuStrings()
-{
- if (m_commandEditMenu)
- {
- wxString buf;
- if (m_currentCommand)
- {
- wxCommand *command = (wxCommand *)m_currentCommand->Data();
- wxString commandName(command->GetName());
- if (commandName == _T("")) commandName = _("Unnamed command");
- bool canUndo = command->CanUndo();
- if (canUndo)
- buf = wxString(_("&Undo ")) + commandName;
- else
- buf = wxString(_("Can't &Undo ")) + commandName;
-
- m_commandEditMenu->SetLabel(wxID_UNDO, buf);
- m_commandEditMenu->Enable(wxID_UNDO, canUndo);
-
- // We can redo, if we're not at the end of the history.
- if (m_currentCommand->Next())
- {
- wxCommand *redoCommand = (wxCommand *)m_currentCommand->Next()->Data();
- wxString redoCommandName(redoCommand->GetName());
- if (redoCommandName == _T("")) redoCommandName = _("Unnamed command");
- buf = wxString(_("&Redo ")) + redoCommandName;
- m_commandEditMenu->SetLabel(wxID_REDO, buf);
- m_commandEditMenu->Enable(wxID_REDO, TRUE);
- }
- else
- {
- m_commandEditMenu->SetLabel(wxID_REDO, _("&Redo"));
- m_commandEditMenu->Enable(wxID_REDO, FALSE);
- }
- }
- else
- {
- m_commandEditMenu->SetLabel(wxID_UNDO, _("&Undo"));
- m_commandEditMenu->Enable(wxID_UNDO, FALSE);
-
- if (m_commands.Number() == 0)
- {
- m_commandEditMenu->SetLabel(wxID_REDO, _("&Redo"));
- m_commandEditMenu->Enable(wxID_REDO, FALSE);
- }
- else
- {
- // currentCommand is NULL but there are commands: this means that
- // we've undone to the start of the list, but can redo the first.
- wxCommand *redoCommand = (wxCommand *)m_commands.First()->Data();
- wxString redoCommandName(redoCommand->GetName());
- if (redoCommandName == _T("")) redoCommandName = _("Unnamed command");
- buf = wxString(_("&Redo ")) + redoCommandName;
- m_commandEditMenu->SetLabel(wxID_REDO, buf);
- m_commandEditMenu->Enable(wxID_REDO, TRUE);
- }
- }
- }