[wxPython-users] how to draw the image in wx.BufferedDC on the page created by AddPage of wx.Notebook

[Christopher Barker]

zxo102 wrote:
> Hi everyone, I have tried two days to figure out how to draw the
> image in wx.BufferedDC on the page created by AddPage of wx.Notebook
> but still got no clue.

You problem has nothing to do with the BufferedWindow. Your issue is =

that when a Frame has only one child, the child is automatically fit to =

the Frame. wx.Notebooks don't do the same auto-sizing, so you were =

getting your window, but it was tiny and up in the corner.

In situations like this, it's always a good idea to reduce the problem =

to it's simplest -- try putting just a blank wx.panel or something on a =

Notebook, and see what happens.

I've enclosed a version of the code that sort of works -- it makes the =

Frame too small to begin with, but if you re-size it it should work.

To do this right, you'll need to use some Sizers.

I changed a couple things in the BufferedWindow code, to make passing =

parameters in cleaner, so I could pass in a size parameter when creating =

it. I also cleaned up a few style issues -- be sure to check out:

http://wiki.wxpython.org/index.cgi/wxPython_Style_Guide

I'm sorry that the BufferedWindow code doesn't conform to that style -- =

I haven't had the chance to change it. Feel free to go in and fix that =

up in the Wiki.

Here are some comments on a few other points:

class DrawWindow(BufferedWindow):
     def __init__(self, *args, **kwargs):
         BufferedWindow.__init__(self, parent, id)

There is no reason to create an __init__ that does nothing but call the =

superclass __init__ it will be called anyway.

         wx.Frame.__init__(self, None, -1, "Double Buffered Test",
                          wx.DefaultPosition,
                          size=3D(500,500),
                          style=3D wx.DEFAULT_FRAME_STYLE | =

wx.NO_FULL_REPAINT_ON_RESIZE)

if you use keyword parameters, you don't need the defaults.
I think wx.NO_FULL_REPAINT_ON_RESIZE is now default, so you can do this =

instead:
         wx.Frame.__init__(self, None,
                           title=3D"Double Buffered Test",
                           size=3D(500,500)
                           )

     str =3D apply(os.path.join, tuple(path.split('/')))

you don't need apply:
str =3D os.path.join(*(path.split('/')))

The "*" means: pass this sequence in as the arguments.

     def __init__(self, parent, id,
                  pos =3D wx.DefaultPosition,
                  size =3D wx.DefaultSize,
                  style=3Dwx.NO_FULL_REPAINT_ON_RESIZE):
         wx.Window.__init__(self, parent, id, pos, size, style)

It's much cleaner to just do the pass-through:

     def __init__(self, *args, **kwargs):
         wx.Window.__init__(self, *args, **kwargs)



-Chris




-- =

Christopher Barker, Ph.D.
Oceanographer
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Chris.Barker at noaa.gov
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