include/wx/cmdproc.h

   1 ///////////////////////////////////////////////////////////////////////////////
   2 // Name:        wx/cmdproc.h
   3 // Purpose:     undo/redo capable command processing framework
   4 // Author:      Julian Smart (extracted from docview.h by VZ)
   5 // Modified by:
   6 // Created:     05.11.00
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) wxWindows team
   9 // Licence:     wxWindows licence
  10 ///////////////////////////////////////////////////////////////////////////////
  11
  12 #ifndef _WX_CMDPROC_H_
  13 #define _WX_CMDPROC_H_
  14
  15 #ifdef __GNUG__
  16     #pragma interface "cmdproc.h"
  17 #endif
  18
  19 #include "wx/object.h"
  20 #include "wx/list.h"
  21
  22 // ----------------------------------------------------------------------------
  23 // wxCommand: a single command capable of performing itself
  24 // ----------------------------------------------------------------------------
  25
  26 class WXDLLEXPORT wxCommand : public wxObject
  27 {
  28 public:
  29     wxCommand(bool canUndoIt = FALSE, const wxString& name = "");
  30     ~wxCommand();
  31
  32     // Override this to perform a command
  33     virtual bool Do() = 0;
  34
  35     // Override this to undo a command
  36     virtual bool Undo() = 0;
  37
  38     virtual bool CanUndo() const { return m_canUndo; }
  39     virtual wxString GetName() const { return m_commandName; }
  40
  41 protected:
  42     bool     m_canUndo;
  43     wxString m_commandName;
  44
  45 private:
  46     DECLARE_CLASS(wxCommand)
  47 };
  48
  49 // ----------------------------------------------------------------------------
  50 // wxCommandProcessor: wxCommand manager
  51 // ----------------------------------------------------------------------------
  52
  53 class WXDLLEXPORT wxCommandProcessor : public wxObject
  54 {
  55 public:
  56     // if max number of commands is -1, it is unlimited
  57     wxCommandProcessor(int maxCommands = -1);
  58     virtual ~wxCommandProcessor();
  59
  60     // Pass a command to the processor. The processor calls Do(); if
  61     // successful, is appended to the command history unless storeIt is FALSE.
  62     virtual bool Submit(wxCommand *command, bool storeIt = TRUE);
  63
  64     // just store the command without executing it
  65     virtual void Store(wxCommand *command);
  66
  67     virtual bool Undo();
  68     virtual bool Redo();
  69     virtual bool CanUndo() const;
  70     virtual bool CanRedo() const;
  71
  72     virtual void Initialize();
  73     virtual void SetMenuStrings();
  74
  75 #if wxUSE_MENUS
  76     // Call this to manage an edit menu.
  77     void SetEditMenu(wxMenu *menu) { m_commandEditMenu = menu; }
  78     wxMenu *GetEditMenu() const { return m_commandEditMenu; }
  79 #endif // wxUSE_MENUS
  80
  81     // command list access
  82     wxList& GetCommands() const { return (wxList&) m_commands; }
  83     wxCommand *GetCurrentCommand() const
  84     {
  85         return (wxCommand *)(m_currentCommand ? m_currentCommand->Data() : NULL);
  86     }
  87     int GetMaxCommands() const { return m_maxNoCommands; }
  88     virtual void ClearCommands();
  89
  90 protected:
  91     // for further flexibility, command processor doesn't call wxCommand::Do()
  92     // and Undo() directly but uses these functions which can be overridden in
  93     // the derived class
  94     virtual bool DoCommand(wxCommand& cmd);
  95     virtual bool UndoCommand(wxCommand& cmd);
  96
  97     int           m_maxNoCommands;
  98     wxList        m_commands;
  99     wxNode*       m_currentCommand;
 100
 101 #if wxUSE_MENUS
 102     wxMenu*       m_commandEditMenu;
 103 #endif // wxUSE_MENUS
 104
 105 private:
 106     DECLARE_DYNAMIC_CLASS(wxCommandProcessor)
 107 };
 108
 109 #endif // _WX_CMDPROC_H_