.. wxPython Phoenix documentation

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

.. include:: headings.inc

.. module:: wx.lib.agw.rulerctrl

.. currentmodule:: wx.lib.agw.rulerctrl

.. highlight:: python



.. _wx.lib.agw.rulerctrl:

==========================================================================================================================================
|phoenix_title|  **wx.lib.agw.rulerctrl**
==========================================================================================================================================

:class:`~wx.lib.agw.rulerctrl.RulerCtrl` implements a ruler window that can be placed on top, bottom, left or right
to any wxPython widget.


Description
===========

:class:`RulerCtrl` implements a ruler window that can be placed on top, bottom, left or right
to any wxPython widget. It is somewhat similar to the rulers you can find in text
editors software, though not so powerful.

:class:`RulerCtrl` has the following characteristics:

- Can be horizontal or vertical;
- 4 built-in formats: integer, real, time and linearDB formats;
- Units (as ``cm``, ``dB``, ``inches``) can be displayed together with the label values;
- Possibility to add a number of "paragraph indicators", small arrows that point at
  the current indicator position;
- Customizable background colour, tick colour, label colour;
- Possibility to flip the ruler (i.e. changing the tick alignment);
- Changing individually the indicator colour (requires PIL at the moment);
- Different window borders are supported (``wx.STATIC_BORDER``, ``wx.SUNKEN_BORDER``,
  ``wx.DOUBLE_BORDER``, ``wx.NO_BORDER``, ``wx.RAISED_BORDER``, ``wx.SIMPLE_BORDER``);
- Logarithmic scale available;
- Possibility to draw a thin line over a selected window when moving an indicator,
  which emulates the text editors software.


And a lot more. See the demo for a review of the functionalities.


Usage
=====

Usage example::

    import wx
    import wx.lib.agw.rulerctrl as RC

    class MyFrame(wx.Frame):

        def __init__(self, parent):

            wx.Frame.__init__(self, parent, -1, "RulerCtrl Demo")

            panel = wx.Panel(self)

            text = wx.TextCtrl(panel, -1, "Hello World! wxPython rules", style=wx.TE_MULTILINE)

            ruler1 = RC.RulerCtrl(panel, -1, orient=wx.HORIZONTAL, style=wx.SUNKEN_BORDER)
            ruler2 = RC.RulerCtrl(panel, -1, orient=wx.VERTICAL, style=wx.SUNKEN_BORDER)

            mainsizer = wx.BoxSizer(wx.HORIZONTAL)
            leftsizer = wx.BoxSizer(wx.VERTICAL)
            bottomleftsizer = wx.BoxSizer(wx.HORIZONTAL)
            topsizer = wx.BoxSizer(wx.HORIZONTAL)

            leftsizer.Add((20, 20), 0, wx.ADJUST_MINSIZE, 0)
            topsizer.Add((39, 0), 0, wx.ADJUST_MINSIZE, 0)
            topsizer.Add(ruler1, 1, wx.EXPAND, 0)
            leftsizer.Add(topsizer, 0, wx.EXPAND, 0)

            bottomleftsizer.Add((10, 0))
            bottomleftsizer.Add(ruler2, 0, wx.EXPAND, 0)
            bottomleftsizer.Add(text, 1, wx.EXPAND, 0)
            leftsizer.Add(bottomleftsizer, 1, wx.EXPAND, 0)
            mainsizer.Add(leftsizer, 3, wx.EXPAND, 0)

            panel.SetSizer(mainsizer)


    # our normal wxApp-derived class, as usual

    app = wx.App(0)

    frame = MyFrame(None)
    app.SetTopWindow(frame)
    frame.Show()

    app.MainLoop()



Events
======

:class:`RulerCtrl` implements the following events related to indicators:

- ``EVT_INDICATOR_CHANGING``: the user is about to change the position of one indicator;
- ``EVT_INDICATOR_CHANGED``: the user has changed the position of one indicator.


Supported Platforms
===================

:class:`RulerCtrl` has been tested on the following platforms:
  * Windows (Windows XP);
  * Linux Ubuntu (Dapper 6.06)


Window Styles
=============

`No particular window styles are available for this class.`


Events Processing
=================

This class processes the following events:

========================== ==================================================
Event Name                 Description
========================== ==================================================
``EVT_INDICATOR_CHANGED``  The user has changed the indicator value.
``EVT_INDICATOR_CHANGING`` The user is about to change the indicator value.
========================== ==================================================


License And Version
===================

:class:`RulerCtrl` is distributed under the wxPython license.

Latest Revision: Andrea Gavana @ 19 Dec 2012, 21.00 GMT

Version 0.4


|function_summary| Functions Summary
====================================

================================================================================ ================================================================================
:func:`~wx.lib.agw.rulerctrl.ConvertPILToWX`                                     Converts a PIL image into a :class:`wx.Image`.
:func:`~wx.lib.agw.rulerctrl.ConvertWXToPIL`                                     Converts a :class:`wx.Image` into a PIL image.
:func:`~wx.lib.agw.rulerctrl.GetIndicatorBitmap`                                 Returns the image indicator as a :class:`wx.Bitmap`.
:func:`~wx.lib.agw.rulerctrl.GetIndicatorData`                                   Returns the image indicator as a decompressed stream of characters.
:func:`~wx.lib.agw.rulerctrl.GetIndicatorImage`                                  Returns the image indicator as a :class:`wx.Image`.
:func:`~wx.lib.agw.rulerctrl.MakePalette`                                        Creates a palette to be applied on an image based on input colour.
================================================================================ ================================================================================


|


|class_summary| Classes Summary
===============================

================================================================================ ================================================================================
:ref:`~wx.lib.agw.rulerctrl.Indicator`                                           This class holds all the information about a single indicator inside :class:`RulerCtrl`.
:ref:`~wx.lib.agw.rulerctrl.Label`                                               Auxiliary class. Just holds information about a label in :class:`RulerCtrl`.
:ref:`~wx.lib.agw.rulerctrl.RulerCtrl`                                           :class:`RulerCtrl` implements a ruler window that can be placed on top, bottom, left or right
:ref:`~wx.lib.agw.rulerctrl.RulerCtrlEvent`                                      Represent details of the events that the :class:`RulerCtrl` object sends.
================================================================================ ================================================================================


|


.. toctree::
   :maxdepth: 1
   :hidden:

   wx.lib.agw.rulerctrl.Indicator
   wx.lib.agw.rulerctrl.Label
   wx.lib.agw.rulerctrl.RulerCtrl
   wx.lib.agw.rulerctrl.RulerCtrlEvent





Functions
------------

.. function:: ConvertPILToWX(pil, alpha=True)

   Converts a PIL image into a :class:`wx.Image`.
   
   :param `pil`: a PIL image;
   :param `alpha`: ``True`` if the image contains alpha transparency, ``False``
    otherwise.
   
   :note: Requires PIL (Python Imaging Library), which can be downloaded from
    http://www.pythonware.com/products/pil/


.. function:: ConvertWXToPIL(bmp)

   Converts a :class:`wx.Image` into a PIL image.
   
   :param `bmp`: an instance of :class:`wx.Image`.
   
   :note: Requires PIL (Python Imaging Library), which can be downloaded from
    http://www.pythonware.com/products/pil/


.. function:: GetIndicatorBitmap()

   Returns the image indicator as a :class:`wx.Bitmap`. 


.. function:: GetIndicatorData()

   Returns the image indicator as a decompressed stream of characters. 


.. function:: GetIndicatorImage()

   Returns the image indicator as a :class:`wx.Image`. 


.. function:: MakePalette(tr, tg, tb)

   Creates a palette to be applied on an image based on input colour.
   
   :param `tr`: the red intensity of the input colour;
   :param `tg`: the green intensity of the input colour;
   :param `tb`: the blue intensity of the input colour.


