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) wxWidgets team
   9 // Licence:     wxWindows licence
  10 ///////////////////////////////////////////////////////////////////////////////
  11
  12 #ifndef _WX_CMDPROC_H_
  13 #define _WX_CMDPROC_H_
  14
  15 #include "wx/defs.h"
  16 #include "wx/object.h"
  17 #include "wx/list.h"
  18
  19 class WXDLLIMPEXP_FWD_CORE wxMenu;
  20
  21 // ----------------------------------------------------------------------------
  22 // wxCommand: a single command capable of performing itself
  23 // ----------------------------------------------------------------------------
  24
  25 class WXDLLEXPORT wxCommand : public wxObject
  26 {
  27 public:
  28     wxCommand(bool canUndoIt = false, const wxString& name = wxEmptyString);
  29     virtual ~wxCommand(){}
  30
  31     // Override this to perform a command
  32     virtual bool Do() = 0;
  33
  34     // Override this to undo a command
  35     virtual bool Undo() = 0;
  36
  37     virtual bool CanUndo() const { return m_canUndo; }
  38     virtual wxString GetName() const { return m_commandName; }
  39
  40 protected:
  41     bool     m_canUndo;
  42     wxString m_commandName;
  43
  44 private:
  45     DECLARE_CLASS(wxCommand)
  46 };
  47
  48 // ----------------------------------------------------------------------------
  49 // wxCommandProcessor: wxCommand manager
  50 // ----------------------------------------------------------------------------
  51
  52 class WXDLLEXPORT wxCommandProcessor : public wxObject
  53 {
  54 public:
  55     // if max number of commands is -1, it is unlimited
  56     wxCommandProcessor(int maxCommands = -1);
  57     virtual ~wxCommandProcessor();
  58
  59     // Pass a command to the processor. The processor calls Do(); if
  60     // successful, is appended to the command history unless storeIt is false.
  61     virtual bool Submit(wxCommand *command, bool storeIt = true);
  62
  63     // just store the command without executing it
  64     virtual void Store(wxCommand *command);
  65
  66     virtual bool Undo();
  67     virtual bool Redo();
  68     virtual bool CanUndo() const;
  69     virtual bool CanRedo() const;
  70
  71     // Initialises the current command and menu strings.
  72     virtual void Initialize();
  73
  74     // Sets the Undo/Redo menu strings for the current menu.
  75     virtual void SetMenuStrings();
  76
  77     // Gets the current Undo menu label.
  78     wxString GetUndoMenuLabel() const;
  79
  80     // Gets the current Undo menu label.
  81     wxString GetRedoMenuLabel() const;
  82
  83 #if wxUSE_MENUS
  84     // Call this to manage an edit menu.
  85     void SetEditMenu(wxMenu *menu) { m_commandEditMenu = menu; }
  86     wxMenu *GetEditMenu() const { return m_commandEditMenu; }
  87 #endif // wxUSE_MENUS
  88
  89     // command list access
  90     wxList& GetCommands() { return m_commands; }
  91     const wxList& GetCommands() const { return m_commands; }
  92     wxCommand *GetCurrentCommand() const
  93     {
  94         return (wxCommand *)(m_currentCommand ? m_currentCommand->GetData() : NULL);
  95     }
  96     int GetMaxCommands() const { return m_maxNoCommands; }
  97     virtual void ClearCommands();
  98
  99     // Has the current project been changed?
 100     virtual bool IsDirty() const
 101     {
 102         return m_currentCommand && (m_lastSavedCommand != m_currentCommand);
 103     }
 104
 105     // Mark the current command as the one where the last save took place
 106     void MarkAsSaved()
 107     {
 108         m_lastSavedCommand = m_currentCommand;
 109     }
 110
 111
 112     // By default, the accelerators are "\tCtrl+Z" and "\tCtrl+Y"
 113     const wxString& GetUndoAccelerator() const { return m_undoAccelerator; }
 114     const wxString& GetRedoAccelerator() const { return m_redoAccelerator; }
 115
 116     void SetUndoAccelerator(const wxString& accel) { m_undoAccelerator = accel; }
 117     void SetRedoAccelerator(const wxString& accel) { m_redoAccelerator = accel; }
 118
 119 protected:
 120     // for further flexibility, command processor doesn't call wxCommand::Do()
 121     // and Undo() directly but uses these functions which can be overridden in
 122     // the derived class
 123     virtual bool DoCommand(wxCommand& cmd);
 124     virtual bool UndoCommand(wxCommand& cmd);
 125
 126     int           m_maxNoCommands;
 127     wxList        m_commands;
 128     wxList::compatibility_iterator m_currentCommand,
 129                                    m_lastSavedCommand;
 130
 131 #if wxUSE_MENUS
 132     wxMenu*       m_commandEditMenu;
 133 #endif // wxUSE_MENUS
 134
 135     wxString      m_undoAccelerator;
 136     wxString      m_redoAccelerator;
 137
 138 private:
 139     DECLARE_DYNAMIC_CLASS(wxCommandProcessor)
 140     DECLARE_NO_COPY_CLASS(wxCommandProcessor)
 141 };
 142
 143 #endif // _WX_CMDPROC_H_
 144