.. include:: headings.inc



.. _VScrolledWindow:

==========================================================================================================================================
|phoenix_title|  **VScrolledWindow**
==========================================================================================================================================

In the name of this class, "V" may stand for "variable" because it can be used for scrolling rows of variable heights; "virtual", because it is not necessary to know the heights of all rows in advance -- only those which are shown on the screen need to be measured; or even "vertical", because this class only supports scrolling vertically.          

In any case, this is a generalization of :ref:`Scrolled`  which can be only used when all rows have the same heights. It lacks some other :ref:`Scrolled`  features however, notably it can't scroll specific pixel sizes of the window or its exact client area size. 

To use this class, you need to derive from it and implement the :meth:`~VScrolledWindow.OnGetRowHeight`  pure virtual method. You also must call :meth:`~VScrolledWindow.SetRowCount`  to let the base class know how many rows it should display, but from that moment on the scrolling is handled entirely by :ref:`VScrolledWindow`. You only need to draw the visible part of contents in your  ``OnPaint()``   method as usual. You should use  :meth:`~VScrolledWindow.GetVisibleRowsBegin`  and :meth:`~VScrolledWindow.GetVisibleRowsEnd`  to select the lines to display. Note that the device context origin is not shifted so the first visible row always appears at the point (0, 0) in physical as well as logical coordinates. 



|phoenix_title| wxWidgets 2.8 Compatibility Functions
=====================================================

The following functions provide backwards compatibility for applications originally built using :ref:`VScrolledWindow`  in 2.6 or 2.8. Originally, :ref:`VScrolledWindow`  referred to scrolling "lines". We now use "units" in :ref:`VarScrollHelperBase`  to avoid implying any orientation (since the functions are used for both horizontal and vertical scrolling in derived classes). And in the new :ref:`VScrolledWindow`  and :ref:`HScrolledWindow`  classes, we refer to them as "rows" and "columns", respectively. This is to help clear some confusion in not only those classes, but also in :ref:`HVScrolledWindow`  where functions are inherited from both. You are encouraged to update any existing code using these function to use the new replacements mentioned below, and avoid using these functions for any new code as they are deprecated. 

.. include:: E:\Phoenix\wxPython\Phoenix\docs\sphinx\rest_substitutions\tables\VScrolledWindow.1.rst





.. seealso:: :ref:`HScrolledWindow`, :ref:`HVScrolledWindow`    







|

|class_hierarchy| Inheritance Diagram
=====================================

Inheritance diagram for class **VScrolledWindow**

.. raw:: html

   <p class="graphviz">
   <img src="_static/images/inheritance/VScrolledWindow_inheritance.png" alt="Inheritance diagram of VScrolledWindow" usemap="#dummy" class="inheritance"/>
   <map id="dummy" name="dummy"> <area shape="rect" id="node1" href="VScrolledWindow.html" title="In the name of this class, 'V' may stand for 'variable' because it can be used for scrolling rows of variable heights; 'virtual', because it is not necessary to know the heights of all rows in advance -- only those which are shown on the screen need to be measured; or even 'vertical', because this class only supports scrolling vertically." alt="" coords="713,58,863,89"/> <area shape="rect" id="node2" href="Panel.html" title="A panel is a window on which controls are placed." alt="" coords="555,31,627,62"/> <area shape="rect" id="node4" href="VarVScrollHelper.html" title="This class provides functions wrapping the VarScrollHelperBase  class, targeted for vertical-specific scrolling." alt="" coords="517,85,664,115"/> <area shape="rect" id="node6" href="Object.html" title="This is the root class of many of the wxWidgets classes." alt="" coords="16,5,88,35"/> <area shape="rect" id="node8" href="EvtHandler.html" title="A class that can handle events from the windowing system." alt="" coords="148,31,247,62"/> <area shape="rect" id="node7" href="Window.html" title="Window  is the base class for all windows and represents any visible object on screen." alt="" coords="343,31,423,62"/> <area shape="rect" id="node10" href="VarScrollHelperBase.html" title="This class provides all common base functionality for scroll calculations shared among all variable scrolled window implementations as well as automatic scrollbar functionality, saved scroll positions, controlling target windows to be scrolled, as well as defining all required virtual functions that need to be implemented for any orientation specific work." alt="" coords="296,85,469,115"/> <area shape="rect" id="node13" href="Trackable.html" title="Add-on base class for a trackable object." alt="" coords="5,58,99,89"/> </map> 
   </p>

|


|sub_classes| Known Subclasses
==============================

`VListBox`

|


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

================================================================================ ================================================================================
:meth:`~VScrolledWindow.__init__`                                                Default constructor, you must call :meth:`Create`   later.
:meth:`~VScrolledWindow.Create`                                                  Same as the non-default constructor, but returns a status code: ``True`` if ok, ``False`` if the window couldn't be created.
================================================================================ ================================================================================


|


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

.. class:: VScrolledWindow(Panel, VarVScrollHelper)

   In the name of this class, "V" may stand for "variable" because it can be used for scrolling rows of variable heights; "virtual", because it is not necessary to know the heights of all rows in advance -- only those which are shown on the screen need to be measured; or even "vertical", because this class only supports scrolling vertically.
   
   **Possible constructors**::

       VScrolledWindow()
       
       VScrolledWindow(parent, id=ID_ANY, pos=DefaultPosition,
                       size=DefaultSize, style=0, name=PanelNameStr)
       



   .. method:: __init__(self, *args, **kw)



      |overload| **Overloaded Implementations**:

      **~~~**

      
      **__init__** `(self)`
      
      Default constructor, you must call :meth:`Create`   later.                   
      
      
      
      
      **~~~**

      
      **__init__** `(self, parent, id=ID_ANY, pos=DefaultPosition, size=DefaultSize, style=0, name=PanelNameStr)`
      
      This is the normal constructor, no need to call :meth:`Create`   after using this constructor.                  
      
      
      
      
      :param `parent`: The parent window, must not be ``None``.   
      :type `parent`: Window
      :param `id`: The identifier of this window, ``ID_ANY`` by default.   
      :type `id`: int
      :param `pos`: The initial window position.   
      :type `pos`: Point
      :param `size`: The initial window size.   
      :type `size`: Size
      :param `style`: The window style. There are no special style bits defined for this class.   
      :type `style`: long
      :param `name`: The name for this window; usually not used.   
      :type `name`: string
      
      
      
      
      
      
      
      
      
      
      
      
      
      
                        
      
      
      
      .. note:: 
      
          ``VSCROLL``   is always automatically added to the style, there is no need to specify it explicitly.  
      
      
      
      
      
      
      
      **~~~**






   .. method:: Create(self, parent, id=ID_ANY, pos=DefaultPosition, size=DefaultSize, style=0, name=PanelNameStr)

      Same as the non-default constructor, but returns a status code: ``True`` if ok, ``False`` if the window couldn't be created.                  

      Just as with the constructor, the  ``VSCROLL``   style is always used, there is no need to specify it explicitly.                   


      :param `parent`: 
      :type `parent`: Window
      :param `id`: 
      :type `id`: int
      :param `pos`: 
      :type `pos`: Point
      :param `size`: 
      :type `size`: Size
      :param `style`: 
      :type `style`: long
      :param `name`: 
      :type `name`: string




      :rtype: `bool`