wxWidgets/include/wx/cmdproc.h

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///////////////////////////////////////////////////////////////////////////////
// Name: wx/cmdproc.h
// Purpose: undo/redo capable command processing framework
// Author: Julian Smart (extracted from docview.h by VZ)
// Modified by:
// Created: 05.11.00
// RCS-ID: $Id$
// Copyright: (c) wxWindows team
// Licence: wxWindows licence
///////////////////////////////////////////////////////////////////////////////
#ifndef _WX_CMDPROC_H_
#define _WX_CMDPROC_H_
#ifdef __GNUG__
#pragma interface "cmdproc.h"
#endif
#include "wx/object.h"
#include "wx/list.h"
// ----------------------------------------------------------------------------
// wxCommand: a single command capable of performing itself
// ----------------------------------------------------------------------------
class WXDLLEXPORT wxCommand : public wxObject
{
public:
wxCommand(bool canUndoIt = FALSE, const wxString& name = "");
~wxCommand();
// Override this to perform a command
virtual bool Do() = 0;
// Override this to undo a command
virtual bool Undo() = 0;
virtual bool CanUndo() const { return m_canUndo; }
virtual wxString GetName() const { return m_commandName; }
protected:
bool m_canUndo;
wxString m_commandName;
private:
DECLARE_CLASS(wxCommand)
};
// ----------------------------------------------------------------------------
// wxCommandProcessor: wxCommand manager
// ----------------------------------------------------------------------------
class WXDLLEXPORT wxCommandProcessor : public wxObject
{
public:
// if max number of commands is -1, it is unlimited
wxCommandProcessor(int maxCommands = -1);
virtual ~wxCommandProcessor();
// Pass a command to the processor. The processor calls Do(); if
// successful, is appended to the command history unless storeIt is FALSE.
virtual bool Submit(wxCommand *command, bool storeIt = TRUE);
// just store the command without executing it
virtual void Store(wxCommand *command);
virtual bool Undo();
virtual bool Redo();
virtual bool CanUndo() const;
virtual bool CanRedo() const;
virtual void Initialize();
virtual void SetMenuStrings();
#if wxUSE_MENUS
// Call this to manage an edit menu.
void SetEditMenu(wxMenu *menu) { m_commandEditMenu = menu; }
wxMenu *GetEditMenu() const { return m_commandEditMenu; }
#endif // wxUSE_MENUS
// command list access
wxList& GetCommands() const { return (wxList&) m_commands; }
wxCommand *GetCurrentCommand() const
{
return (wxCommand *)(m_currentCommand ? m_currentCommand->Data() : NULL);
}
int GetMaxCommands() const { return m_maxNoCommands; }
virtual void ClearCommands();
protected:
// for further flexibility, command processor doesn't call wxCommand::Do()
// and Undo() directly but uses these functions which can be overridden in
// the derived class
virtual bool DoCommand(wxCommand& cmd);
virtual bool UndoCommand(wxCommand& cmd);
int m_maxNoCommands;
wxList m_commands;
wxNode* m_currentCommand;
#if wxUSE_MENUS
wxMenu* m_commandEditMenu;
#endif // wxUSE_MENUS
private:
DECLARE_DYNAMIC_CLASS(wxCommandProcessor)
};
#endif // _WX_CMDPROC_H_