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 #if defined(__GNUG__) && !defined(__APPLE__)
  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 = wxT(""));
  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     // Initialises the current command and menu strings.
  73     virtual void Initialize();
  74
  75     // Sets the Undo/Redo menu strings for the current menu.
  76     virtual void SetMenuStrings();
  77
  78     // Gets the current Undo menu label.
  79     wxString GetUndoMenuLabel() const;
  80
  81     // Gets the current Undo menu label.
  82     wxString GetRedoMenuLabel() const;
  83
  84 #if wxUSE_MENUS
  85     // Call this to manage an edit menu.
  86     void SetEditMenu(wxMenu *menu) { m_commandEditMenu = menu; }
  87     wxMenu *GetEditMenu() const { return m_commandEditMenu; }
  88 #endif // wxUSE_MENUS
  89
  90     // command list access
  91     wxList& GetCommands() const { return (wxList&) m_commands; }
  92     wxCommand *GetCurrentCommand() const
  93     {
  94         return (wxCommand *)(m_currentCommand ? m_currentCommand->Data() : NULL);
  95     }
  96     int GetMaxCommands() const { return m_maxNoCommands; }
  97     virtual void ClearCommands();
  98
  99     // By default, the accelerators are "\tCtrl+Z" and "\tCtrl+Y"
 100     const wxString& GetUndoAccelerator() const { return m_undoAccelerator; }
 101     const wxString& GetRedoAccelerator() const { return m_redoAccelerator; }
 102
 103     void SetUndoAccelerator(const wxString& accel) { m_undoAccelerator = accel; }
 104     void SetRedoAccelerator(const wxString& accel) { m_redoAccelerator = accel; }
 105
 106 protected:
 107     // for further flexibility, command processor doesn't call wxCommand::Do()
 108     // and Undo() directly but uses these functions which can be overridden in
 109     // the derived class
 110     virtual bool DoCommand(wxCommand& cmd);
 111     virtual bool UndoCommand(wxCommand& cmd);
 112
 113     int           m_maxNoCommands;
 114     wxList        m_commands;
 115     wxNode*       m_currentCommand;
 116
 117 #if wxUSE_MENUS
 118     wxMenu*       m_commandEditMenu;
 119 #endif // wxUSE_MENUS
 120
 121     wxString      m_undoAccelerator;
 122     wxString      m_redoAccelerator;
 123
 124 private:
 125     DECLARE_DYNAMIC_CLASS(wxCommandProcessor)
 126     DECLARE_NO_COPY_CLASS(wxCommandProcessor)
 127 };
 128
 129 #endif // _WX_CMDPROC_H_