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   Copyright: (c) 2011-2020 by Total Control Software
   License:   wxWindows License

.. include:: headings.inc

.. currentmodule:: wx.lib.docview

.. highlight:: python



.. _wx.lib.docview.CommandProcessor:

==========================================================================================================================================
|phoenix_title|  **wx.lib.docview.CommandProcessor**
==========================================================================================================================================

:class:`CommandProcessor` is a class that maintains a history of
:class:`Commands`, with undo/redo functionality built-in. Derive a
new class from this if you want different behaviour.



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

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   <img id="toggleBlock-trigger" src="_static/images/closed.png"/>
   Inheritance diagram for class <strong>CommandProcessor</strong>:
   </div>
   <div id="toggleBlock-summary" style="display:block;"></div>
   <div id="toggleBlock-content" style="display:none;">
   <p class="graphviz">
   <center><img src="_static/images/inheritance/wx.lib.docview.CommandProcessor_inheritance.svg" alt="Inheritance diagram of CommandProcessor" usemap="#dummy" class="inheritance"/></center>
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   <map id="dummy" name="dummy"> <area shape="rect" id="node1" href="wx.lib.docview.CommandProcessor.html" title="CommandProcessor is a class that maintains a history of" alt="" coords="5,82,287,111"/> <area shape="rect" id="node2" href="wx.Object.html" title="This is the root class of many of the wxWidgets classes." alt="" coords="97,5,196,34"/> </map> 
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|


|super_classes| Known Superclasses
==================================

:class:`wx.Object`

|


|method_summary| Methods Summary
================================

================================================================================ ================================================================================
:meth:`~wx.lib.docview.CommandProcessor.__init__`                                Constructor.  ``maxCommands`` may be set to a positive integer to limit
:meth:`~wx.lib.docview.CommandProcessor.CanRedo`                                 Returns ``True`` if the currently-active command can be redone,
:meth:`~wx.lib.docview.CommandProcessor.CanUndo`                                 Returns ``True`` if the currently-active command can be undone,
:meth:`~wx.lib.docview.CommandProcessor.ClearCommands`                           Deletes all the commands in the list and sets the current command
:meth:`~wx.lib.docview.CommandProcessor.GetCommands`                             Returns the list of commands.
:meth:`~wx.lib.docview.CommandProcessor.GetEditMenu`                             Returns the edit menu associated with the command processor.
:meth:`~wx.lib.docview.CommandProcessor.GetMaxCommands`                          Returns the maximum number of commands that the command processor
:meth:`~wx.lib.docview.CommandProcessor.GetRedoAccelerator`                      Returns the string that will be appended to the Redo menu item.
:meth:`~wx.lib.docview.CommandProcessor.GetUndoAccelerator`                      Returns the string that will be appended to the Undo menu item.
:meth:`~wx.lib.docview.CommandProcessor.Redo`                                    Redoes the command just undone.
:meth:`~wx.lib.docview.CommandProcessor.SetEditMenu`                             Tells the command processor to update the Undo and Redo items on this
:meth:`~wx.lib.docview.CommandProcessor.SetMenuStrings`                          Sets the menu labels according to the currently set menu and the
:meth:`~wx.lib.docview.CommandProcessor.SetRedoAccelerator`                      Sets the string that will be appended to the Redo menu item.
:meth:`~wx.lib.docview.CommandProcessor.SetUndoAccelerator`                      Sets the string that will be appended to the Redo menu item.
:meth:`~wx.lib.docview.CommandProcessor.Submit`                                  Submits a new command to the command processor. The command processor
:meth:`~wx.lib.docview.CommandProcessor.Undo`                                    Undoes the command just executed.
================================================================================ ================================================================================


|


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


.. class:: CommandProcessor(wx.Object)

   :class:`CommandProcessor` is a class that maintains a history of
   :class:`Commands`, with undo/redo functionality built-in. Derive a
   new class from this if you want different behaviour.

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

      Constructor.  ``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.


   .. method:: CanRedo(self)

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


   .. method:: CanUndo(self)

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


   .. method:: ClearCommands(self)

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


   .. method:: GetCommands(self)

      Returns the list of commands.


   .. method:: GetEditMenu(self)

      Returns the edit menu associated with the command processor.


   .. method:: GetMaxCommands(self)

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


   .. method:: GetRedoAccelerator(self)

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


   .. method:: GetUndoAccelerator(self)

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


   .. method:: Redo(self)

      Redoes the command just undone.


   .. 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.


   .. 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.


   .. method:: SetUndoAccelerator(self, accel)

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


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

      Submits a new command to the command processor. The command processor
      calls :meth:`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 Submit has been called, the passed command should
      not be deleted directly by the application.
      
      ``storeIt`` indicates whether the successful command should be stored in
      the history list.


   .. method:: Undo(self)

      Undoes the command just executed.