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 class WXDLLEXPORT wxMenu;
  23
  24 // ----------------------------------------------------------------------------
  25 // wxCommand: a single command capable of performing itself
  26 // ----------------------------------------------------------------------------
  27
  28 class WXDLLEXPORT wxCommand : public wxObject
  29 {
  30 public:
  31     wxCommand(bool canUndoIt = FALSE, const wxString& name = wxEmptyString);
  32     ~wxCommand();
  33
  34     // Override this to perform a command
  35     virtual bool Do() = 0;
  36
  37     // Override this to undo a command
  38     virtual bool Undo() = 0;
  39
  40     virtual bool CanUndo() const { return m_canUndo; }
  41     virtual wxString GetName() const { return m_commandName; }
  42
  43 protected:
  44     bool     m_canUndo;
  45     wxString m_commandName;
  46
  47 private:
  48     DECLARE_CLASS(wxCommand)
  49 };
  50
  51 // ----------------------------------------------------------------------------
  52 // wxCommandProcessor: wxCommand manager
  53 // ----------------------------------------------------------------------------
  54
  55 class WXDLLEXPORT wxCommandProcessor : public wxObject
  56 {
  57 public:
  58     // if max number of commands is -1, it is unlimited
  59     wxCommandProcessor(int maxCommands = -1);
  60     virtual ~wxCommandProcessor();
  61
  62     // Pass a command to the processor. The processor calls Do(); if
  63     // successful, is appended to the command history unless storeIt is FALSE.
  64     virtual bool Submit(wxCommand *command, bool storeIt = TRUE);
  65
  66     // just store the command without executing it
  67     virtual void Store(wxCommand *command);
  68
  69     virtual bool Undo();
  70     virtual bool Redo();
  71     virtual bool CanUndo() const;
  72     virtual bool CanRedo() const;
  73
  74     // Initialises the current command and menu strings.
  75     virtual void Initialize();
  76
  77     // Sets the Undo/Redo menu strings for the current menu.
  78     virtual void SetMenuStrings();
  79
  80     // Gets the current Undo menu label.
  81     wxString GetUndoMenuLabel() const;
  82
  83     // Gets the current Undo menu label.
  84     wxString GetRedoMenuLabel() const;
  85
  86 #if wxUSE_MENUS
  87     // Call this to manage an edit menu.
  88     void SetEditMenu(wxMenu *menu) { m_commandEditMenu = menu; }
  89     wxMenu *GetEditMenu() const { return m_commandEditMenu; }
  90 #endif // wxUSE_MENUS
  91
  92     // command list access
  93     wxList& GetCommands() const { return (wxList&) m_commands; }
  94     wxCommand *GetCurrentCommand() const
  95     {
  96         return (wxCommand *)(m_currentCommand ? m_currentCommand->GetData() : NULL);
  97     }
  98     int GetMaxCommands() const { return m_maxNoCommands; }
  99     virtual void ClearCommands();
 100
 101     // By default, the accelerators are "\tCtrl+Z" and "\tCtrl+Y"
 102     const wxString& GetUndoAccelerator() const { return m_undoAccelerator; }
 103     const wxString& GetRedoAccelerator() const { return m_redoAccelerator; }
 104
 105     void SetUndoAccelerator(const wxString& accel) { m_undoAccelerator = accel; }
 106     void SetRedoAccelerator(const wxString& accel) { m_redoAccelerator = accel; }
 107
 108 protected:
 109     // for further flexibility, command processor doesn't call wxCommand::Do()
 110     // and Undo() directly but uses these functions which can be overridden in
 111     // the derived class
 112     virtual bool DoCommand(wxCommand& cmd);
 113     virtual bool UndoCommand(wxCommand& cmd);
 114
 115     int           m_maxNoCommands;
 116     wxList        m_commands;
 117     wxNode*       m_currentCommand;
 118
 119 #if wxUSE_MENUS
 120     wxMenu*       m_commandEditMenu;
 121 #endif // wxUSE_MENUS
 122
 123     wxString      m_undoAccelerator;
 124     wxString      m_redoAccelerator;
 125
 126 private:
 127     DECLARE_DYNAMIC_CLASS(wxCommandProcessor)
 128     DECLARE_NO_COPY_CLASS(wxCommandProcessor)
 129 };
 130
 131 #endif // _WX_CMDPROC_H_