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.. _wx.CommandProcessor:

==========================================================================================================================================
|phoenix_title|  **wx.CommandProcessor**
==========================================================================================================================================

:ref:`wx.CommandProcessor`  is a class that maintains a history of Commands, with undo/redo functionality built-in.          

Derive a new class from this if you want different behaviour. 







         



.. seealso:: :ref:`CommandProcessor Overview <commandprocessor overview>`, :ref:`wx.Command`    







|

|class_hierarchy| Class Hierarchy
=================================

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   Inheritance diagram for class <strong>CommandProcessor</strong>:
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   <center><img src="_static/images/inheritance/wx.CommandProcessor_inheritance.png" alt="Inheritance diagram of CommandProcessor" usemap="#dummy" class="inheritance"/></center>
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|method_summary| Methods Summary
================================

================================================================================ ================================================================================
:meth:`~wx.CommandProcessor.__init__`                                            Constructor.
:meth:`~wx.CommandProcessor.CanRedo`                                             Returns ``True`` if the currently-active command can be redone, ``False`` otherwise.
:meth:`~wx.CommandProcessor.CanUndo`                                             Returns ``True`` if the currently-active command can be undone, ``False`` otherwise.
:meth:`~wx.CommandProcessor.ClearCommands`                                       Deletes all commands in the list and sets the current command pointer to ``None``.
:meth:`~wx.CommandProcessor.GetCommands`                                         Returns the list of commands.
:meth:`~wx.CommandProcessor.GetCurrentCommand`                                   Returns the current command.
:meth:`~wx.CommandProcessor.GetEditMenu`                                         Returns the edit menu associated with the command processor.
:meth:`~wx.CommandProcessor.GetMaxCommands`                                      Returns the maximum number of commands that the command processor stores.
:meth:`~wx.CommandProcessor.GetRedoAccelerator`                                  Returns the string that will be appended to the Redo menu item.
:meth:`~wx.CommandProcessor.GetRedoMenuLabel`                                    Returns the string that will be shown for the redo menu item.
:meth:`~wx.CommandProcessor.GetUndoAccelerator`                                  Returns the string that will be appended to the Undo menu item.
:meth:`~wx.CommandProcessor.GetUndoMenuLabel`                                    Returns the string that will be shown for the undo menu item.
:meth:`~wx.CommandProcessor.Initialize`                                          Initializes the command processor, setting the current command to the last in the list (if any), and updating the edit menu (if one has been specified).
:meth:`~wx.CommandProcessor.IsDirty`                                             Returns a boolean value that indicates if changes have been made since the last save operation.
:meth:`~wx.CommandProcessor.MarkAsSaved`                                         You must call this method whenever the project is saved if you plan to use :meth:`~CommandProcessor.IsDirty` .
:meth:`~wx.CommandProcessor.Redo`                                                Executes (redoes) the current command (the command that has just been undone if any).
:meth:`~wx.CommandProcessor.SetEditMenu`                                         Tells the command processor to update the Undo and Redo items on this menu as appropriate.
:meth:`~wx.CommandProcessor.SetMenuStrings`                                      Sets the menu labels according to the currently set menu and the current command state.
:meth:`~wx.CommandProcessor.SetRedoAccelerator`                                  Sets the string that will be appended to the Redo menu item.
:meth:`~wx.CommandProcessor.SetUndoAccelerator`                                  Sets the string that will be appended to the Undo menu item.
:meth:`~wx.CommandProcessor.Store`                                               Just store the command without executing it.
:meth:`~wx.CommandProcessor.Submit`                                              Submits a new command to the command processor.
:meth:`~wx.CommandProcessor.Undo`                                                Undoes the last command executed.
================================================================================ ================================================================================


|


|property_summary| Properties Summary
=====================================

================================================================================ ================================================================================
:attr:`~wx.CommandProcessor.Commands`                                            See :meth:`~wx.CommandProcessor.GetCommands`
:attr:`~wx.CommandProcessor.CurrentCommand`                                      See :meth:`~wx.CommandProcessor.GetCurrentCommand`
:attr:`~wx.CommandProcessor.EditMenu`                                            See :meth:`~wx.CommandProcessor.GetEditMenu` and :meth:`~wx.CommandProcessor.SetEditMenu`
:attr:`~wx.CommandProcessor.MaxCommands`                                         See :meth:`~wx.CommandProcessor.GetMaxCommands`
:attr:`~wx.CommandProcessor.RedoAccelerator`                                     See :meth:`~wx.CommandProcessor.GetRedoAccelerator` and :meth:`~wx.CommandProcessor.SetRedoAccelerator`
:attr:`~wx.CommandProcessor.RedoMenuLabel`                                       See :meth:`~wx.CommandProcessor.GetRedoMenuLabel`
:attr:`~wx.CommandProcessor.UndoAccelerator`                                     See :meth:`~wx.CommandProcessor.GetUndoAccelerator` and :meth:`~wx.CommandProcessor.SetUndoAccelerator`
:attr:`~wx.CommandProcessor.UndoMenuLabel`                                       See :meth:`~wx.CommandProcessor.GetUndoMenuLabel`
================================================================================ ================================================================================


|


|api| Class API
===============


.. class:: wx.CommandProcessor(Object)

   **Possible constructors**::

       CommandProcessor(maxCommands=-1)
       
   
   CommandProcessor is a class that maintains a history of Commands,
   with undo/redo functionality built-in.



   .. method:: __init__(self, maxCommands=-1)

      Constructor.                  




      :param `maxCommands`: May be set to a positive integer to limit the number of commands stored to it, otherwise (and by default) the list of commands can grow arbitrarily.   
      :type `maxCommands`: int




                  





   .. method:: CanRedo(self)

      Returns ``True`` if the currently-active command can be redone, ``False`` otherwise.                  

      :rtype: `bool`








   .. method:: CanUndo(self)

      Returns ``True`` if the currently-active command can be undone, ``False`` otherwise.                  

      :rtype: `bool`








   .. method:: ClearCommands(self)

      Deletes all commands in the list and sets the current command pointer to ``None``.                   





   .. method:: GetCommands(self)

      Returns the list of commands.                  

      :rtype: :ref:`CommandList`








   .. method:: GetCurrentCommand(self)

      Returns the current command.                  

      :rtype: :ref:`wx.Command`








   .. method:: GetEditMenu(self)

      Returns the edit menu associated with the command processor.                  

      :rtype: :ref:`wx.Menu`








   .. method:: GetMaxCommands(self)

      Returns the maximum number of commands that the command processor stores.                  

      :rtype: `int`








   .. method:: GetRedoAccelerator(self)

      Returns the string that will be appended to the Redo menu item.                  

      :rtype: `string`








   .. method:: GetRedoMenuLabel(self)

      Returns the string that will be shown for the redo menu item.                  

      :rtype: `string`








   .. method:: GetUndoAccelerator(self)

      Returns the string that will be appended to the Undo menu item.                  

      :rtype: `string`








   .. method:: GetUndoMenuLabel(self)

      Returns the string that will be shown for the undo menu item.                  

      :rtype: `string`








   .. method:: Initialize(self)

      Initializes the command processor, setting the current command to the last in the list (if any), and updating the edit menu (if one has been specified).                   





   .. method:: IsDirty(self)

      Returns a boolean value that indicates if changes have been made since the last save operation.                  

      This only works if :meth:`MarkAsSaved`   is called whenever the project is saved.                  

      :rtype: `bool`








   .. method:: MarkAsSaved(self)

      You must call this method whenever the project is saved if you plan to use :meth:`IsDirty` .                   





   .. method:: Redo(self)

      Executes (redoes) the current command (the command that has just been undone if any).                  

      :rtype: `bool`








   .. method:: SetEditMenu(self, menu)

      Tells the command processor to update the Undo and Redo items on this menu as appropriate.                  

      Set this to ``None`` if the menu is about to be destroyed and command operations may still be performed, or the command processor may try to access an invalid pointer.                  


      :param `menu`: 
      :type `menu`: wx.Menu







   .. method:: SetMenuStrings(self)

      Sets the menu labels according to the currently set menu and the current command state.                   





   .. method:: SetRedoAccelerator(self, accel)

      Sets the string that will be appended to the Redo menu item.                  


      :param `accel`: 
      :type `accel`: string







   .. method:: SetUndoAccelerator(self, accel)

      Sets the string that will be appended to the Undo menu item.                  


      :param `accel`: 
      :type `accel`: string







   .. method:: Store(self, command)

      Just store the command without executing it.                  

      The command is stored in the history list, and the associated edit menu (if any) updated appropriately.                  


      :param `command`: 
      :type `command`: wx.Command







   .. method:: Submit(self, command, storeIt=True)

      Submits a new command to the command processor.                  

      The command processor calls :meth:`wx.Command.Do`   to execute the command; if it succeeds, the command is stored in the history list, and the associated edit menu (if any) updated appropriately. If it fails, the command is deleted immediately. Once :meth:`Submit`   has been called, the passed command should not be deleted directly by the application. 




      :param `command`: The command to submit   
      :type `command`: wx.Command
      :param `storeIt`: Indicates whether the successful command should be stored in the history list.   
      :type `storeIt`: bool








      :rtype: `bool`



                  





   .. method:: Undo(self)

      Undoes the last command executed.                  

      :rtype: `bool`








   .. attribute:: Commands

      See :meth:`~wx.CommandProcessor.GetCommands`


   .. attribute:: CurrentCommand

      See :meth:`~wx.CommandProcessor.GetCurrentCommand`


   .. attribute:: EditMenu

      See :meth:`~wx.CommandProcessor.GetEditMenu` and :meth:`~wx.CommandProcessor.SetEditMenu`


   .. attribute:: MaxCommands

      See :meth:`~wx.CommandProcessor.GetMaxCommands`


   .. attribute:: RedoAccelerator

      See :meth:`~wx.CommandProcessor.GetRedoAccelerator` and :meth:`~wx.CommandProcessor.SetRedoAccelerator`


   .. attribute:: RedoMenuLabel

      See :meth:`~wx.CommandProcessor.GetRedoMenuLabel`


   .. attribute:: UndoAccelerator

      See :meth:`~wx.CommandProcessor.GetUndoAccelerator` and :meth:`~wx.CommandProcessor.SetUndoAccelerator`


   .. attribute:: UndoMenuLabel

      See :meth:`~wx.CommandProcessor.GetUndoMenuLabel`

