wxPython 2.5 Migration Guide

wxPython 2.6 Migration Guide

This document will help explain some of the major changes in wxPython -2.5 since the 2.4 series and let you know what you need to do to adapt +2.6 since the 2.4 series and let you know what you need to do to adapt your programs to those changes. Be sure to also check in the CHANGES file like usual to see info about the not so major changes and other things that have been added to wxPython.

@@ -304,7 +304,7 @@ SetClippingRect(self, rect)

wxPython's setup.py script now expects to use existing libraries for the contribs (gizmos, stc, xrc, etc.) rather than building local copies of them. If you build your own copies of wxPython please be -aware that you now need to also build the ogl, stc, xrc, and gizmos +aware that you now need to also build the stc, xrc, animate and gizmos libraries in addition to the main wx lib.

The wxPython.h and other header files are now in .../wxPython/include/wx/wxPython instead of in wxPython/src. You @@ -317,7 +317,7 @@ path should already be set properly.

If you are also using SWIG for your extension then you'll need to adapt how the wxPython .i files are imported into your .i files. See the wxPython sources for examples. Your modules will need to at least -%import core.i, and possibly others if you need the definition of +%import core.i, and possibly others if you need the definition of other classes. Since you will need them to build your modules using SWIG, the main wxPython .i files are also installed with the wxPython headers in an i_files sibdirectory. It should be enough to pass a @@ -326,7 +326,7 @@ headers in an i_files sibdirectory. It should be enough to pass a wx/build/config.py. This module will be installed as part of wxPython so 3rd party modules that wish to use the same setup/configuration code can do so simply by importing this module from their own setup.py -scripts using import wx.build.config.

+scripts using import wx.build.config.

You no longer need to call wxClassInfo::CleanUpClasses() and wxClassInfo::InitializeClasses() in your extensions or when embedding wxPython.

@@ -358,9 +358,9 @@ class MyDialog(wx.Dialog):

Sizers

The hack allowing the old "option" keyword parameter has been removed. -If you use keyword args with w.xSizer Add, Insert, or Prepend methods -then you will need to use the proportion name instead of -option. (The proportion keyword was also allowed in 2.4.2.4.)

+If you use keyword args with wx.Sizer Add, Insert, or Prepend methods +then you will need to use the proportion name instead of +option. (The proportion keyword was also allowed in 2.4.2.4.)

When adding a spacer to a sizer you now need to use a wx.Size or a 2-integer sequence instead of separate width and height parameters. This was optionally allowed in 2.4, but now it is required. This @@ -377,7 +377,10 @@ be used from XRC.

Insert, Prepend, and etc.) methods any longer. Just use Add and the wrappers will figure out what to do. [Changed in 2.5.2.x] AddWindow, AddSizer, AddSpacer and etc. will now issue a -DeprecationWarning.

+DeprecationWarning. [Changed in 2.5.4.x] These methods have now +been undeprecated at the request of Riaan Booysen, the Boa Constructor +team lead. They are now just simple compatibility aliases for Add, +and etc.

[Changed in 2.5.2.x] The Sizers have had some fundamental internal changes in the 2.5.2.x release intended to make them do more of the "Right Thing" but also be as backwards compatible as possible. @@ -388,41 +391,41 @@ First a bit about how things used to work:

to be its minimal size, and that size would always be used by default when calculating layout size and positions, and the sizer itself would keep track of that minimal size. -

If the window item was added with the wx.ADJUST_MINSIZE -flag then when layout was calculated the item's GetBestSize +

If the window item was added with the wx.ADJUST_MINSIZE +flag then when layout was calculated the item's GetBestSize would be used to reset the minimal size that the sizer used.

The main thrust of the new Sizer changes was to make behaviour like -wx.ADJUST_MINSIZE be the default, and also to push the tracking of +

The main thrust of the new Sizer changes was to make behavior like +wx.ADJUST_MINSIZE be the default, and also to push the tracking of the minimal size to the window itself (since it knows its own needs) instead of having the sizer take care of it. Consequently these changes were made:

-
The wx.FIXED_MINSIZE flag was added to allow for the old -behaviour. When this flag is used the size a window has when +
The wx.FIXED_MINSIZE flag was added to allow for the old +behavior. When this flag is used the size a window has when added to the sizer will be treated as its minimal size and it will not be readjusted on each layout.
-
The min size stored in wx.Window and settable with -SetSizeHints or SetMinSize will by default be used by +
The min size stored in wx.Window and settable with +SetSizeHints or SetMinSize will by default be used by the sizer (if it was set) as the minimal size of the sizer item. If the min size was not set (or was only partially set) then the window's best size is fetched and it is used instead of (or -blended with) the min size. wx.Window.GetBestFittingSize +blended with) the min size. wx.Window.GetBestFittingSize was added to facilitate getting the size to be used by the sizers.

The best size of a window is cached so it doesn't need to -recaculated on every layout. wx.Window.InvalidateBestSize +recaculated on every layout. wx.Window.InvalidateBestSize was added and should be called (usually just internally in control methods) whenever something is done that would make the best size change.

All wxControls were changed to set the minsize to what is passed to the constructor or Create method, and also to set the real size of the control to the blending of the min size and best -size. wx.Window.SetBestFittingSize was added to help with +size. wx.Window.SetBestFittingSize was added to help with this, although most controls don't need to call it directly -because it is called indirectly via the SetInitialSize +because it is called indirectly via the SetInitialSize called in the base classes.

@@ -438,34 +441,34 @@ but now the sizer will use the default size as the minimum rather than the size set later. It is an easy fix though, just move the specification of the size to the constructor (assuming that SomeWidget will set its minsize there like the rest of the controls do) or call -SetMinSize instead of SetSize.

+SetMinSize instead of SetSize.

In order to fit well with this new scheme of things, all wxControls or custom controls should do the following things. (Depending on how they are used you may also want to do the same thing for non-control custom windows.)

-
Either override or inherit a meaningful DoGetBestSize method +
Either override or inherit a meaningful DoGetBestSize method that calculates whatever size is "best" for the control. Once that size is calculated then there should normally be a call to -CacheBestSize to save it for later use, unless for some +CacheBestSize to save it for later use, unless for some reason you want the best size to be recalculated on every layout.
-
Note: In order to successfully override DoGetBestSize in -Python the class needs to be derived from wx.PyWindow, -wx.PyControl, or etc. If your class instead derives from +
Note: In order to successfully override DoGetBestSize in +Python the class needs to be derived from wx.PyWindow, +wx.PyControl, or etc. If your class instead derives from one of the standard wx classes then just be sure that the min size gets explicitly set to what would have been the best size and things should work properly in almost all situations.

Any method that changes the attributes of the control such that -the best size will change should call InvalidateBestSize so +the best size will change should call InvalidateBestSize so it will be recalculated the next time it is needed.

The control's constructor and/or Create method should ensure that the minsize is set to the size passed in, and that the control is sized to a blending of the min size and best size. -This can be done by calling SetBestFittingSize.
+This can be done by calling SetBestFittingSize.

@@ -603,9 +606,7 @@ mask and the rest would be made fully opaque.

channel and will now only create a mask when all the pixels in the image are either fully transparent or fully opaque. In addition, the wx.DC.DrawBitmap and wx.DC.Blit methods are able to correctly blend -the pixels in the image with partially transparent alpha values. -(Currently only on MSW and Mac, if anybody knows how to do it for GTK -then please submit a patch!)

+the pixels in the image with partially transparent alpha values.

If you are using a PNG with an alpha channel but you need to have a wx.Mask like you automatically got in 2.4 then you can do one of the following:

@@ -621,18 +622,20 @@ fully transparent.

OGL is dead! LONG LIVE OGL!

[Changed in 2.5.2.x]

The wx.ogl module has been deprecated in favor of the new Python port -of the OGL library located at wx.lib.ogl contributed by Pierre Hjälm. -This will hopefully greatly extend the life of OGL within wxPython by -making it more easily maintainable and less prone to getting rusty as -there seems to be less and less interest in maintaining the C++ -version.

The wx.ogl module was deprecated in version 2.5.2 in favor of the new +Python port of the OGL library located at wx.lib.ogl contributed by +Pierre Hjälm. Starting in version 2.5.5 the old ogl is no longer +being built in the distributed binaries, however the source code is +still in the source tree so people can built it themselves if desired.

The reason this changes was done was to greatly extend the life of OGL +within wxPython by making it more easily maintainable and less prone +to getting rusty as there seems to be less and less interest in +maintaining the C++ version.

There are only a few known compatibility issues at this time. First -is that the ogl.DrawnShape has not been reimplemented yet. Next is the -location of OGL. The deprecated version is located in the wx.ogl -module, and the new version is in the wx.lib.ogl package. So this -just means that to start using the new version you need to adjust your -imports. So if your code currently has something like this:

+is the location of OGL. The old version was located in the +wx.ogl module, and the new version is in the wx.lib.ogl package. So +this just means that to start using the new version you need to adjust +your imports. So if your code currently has something like this:

 import wx
 import wx.ogl as ogl
@@ -761,17 +764,17 @@ if "unicode" in wx.PlatformInfo:
 
 Multi-Version Installs
 [Changed in 2.5.3.x]
-Starting with 2.5.3.0 the wx and wxPython pacakge directories will be
+
Starting with 2.5.3.0 the wx and wxPython package directories will be
 installed in a subdirectory of the site-packages directory, instead of
-directly in site-pacakges.  This is done to help facilitate having
+directly in site-packages.  This is done to help facilitate having
 multiple versions of wxPython installed side-by-side.  Why would you
 want to do this?  One possible scenario is you have an app that
 requires wxPython 2.4 but you want to use the newest 2.5 to do your
-development with.  Or perhaps you want to be able to test your app
+own development with.  Or perhaps you want to be able to test your app
 with several different versions of wxPython to ensure compatibility.
 Before everyone panics, rest asured that if you only install one
-version of wxPython then you should notice no difference in how
-things work.
+version of wxPython then you should notice no difference in how things
+work.
 In addition to installing wxPython into a "versioned" subdirectory of
 site-packages, a file named wx.pth is optionally installed that will
 contain the name of the versioned subdirectory.  This will cause that
@@ -785,15 +788,15 @@ statement.  Of course you can always manipulate that by editing the
 wx.pth file, or by setting PYTHONPATH in the environment, or by the
 method described in the next paragraph.
 Finally, a new module named wxversion.py is installed to the
-site-pacakges directory.  It can be used to manipulate the sys.path at
+site-packages directory.  It can be used to manipulate the sys.path at
 runtime so your applications can select which version of wxPython they
 would like to to have imported.  You use it like this:
  import wxversion
-wxversion.require("2.4")
+wxversion.select("2.4")
 import wx
 
-Then eventhough a 2.5 version of wxPython may be the default the
+
Then even though a 2.5 version of wxPython may be the default the
 application that does the above the first time that wx is imported
 will actually get a 2.4 version.  NOTE: There isn't actually a 2.4
 version of wxPython that supports this, but there will be.