added extra parentheses to wxDynamicCast() to allow using it like wxDynamicCast(foo...

[wxWidgets.git] / docs / changes.txt

wxWindows 2 Change Log
----------------------

INCOMPATIBLE CHANGES SINCE 2.2.x
================================

    Please take a few minutes to read the following list, especially
    paying attention to the most important changes which are marked
    with '!' in the first column.

    Also please note that you should ensure that WXWIN_COMPATIBILITY_2_2
    is defined to 1 if you wish to retain maximal compatibility with 2.2
    series -- however you are also strongly encouraged to try to compile
    your code without this define as it won't be default any longer in
    2.6 release.


wxBase:

! wxArray<T>::Remove(size_t) has been removed to fix compilation problems
  under 64 bit architectures, please replace it with RemoveAt() in your
  code.

! wxArray<T> macros have been changed to fix runtime problems under 64 bit
  architectures and as a side effect of this WX_DEFINE_ARRAY() can only be
  used now for the pointer types, WX_DEFINE_ARRAY_INT should be used for the
  arrays containing non-pointers.

- wxObject::CopyObject() and Clone() methods were removed because they
  simply don't make sense for all objects

- wxEvent now has a pure virtual Clone() method which must be implemented
  by all derived classes, if you have user-defined event classes please
  add "wxEvent *Clone() const { return new MyEvent(*this); }" line to them

- small change to wxStopWatch::Pause() semantics, please see the documentation

- unlikely but possible incompatibility: the definition of TRUE has changed
  from "1" to "(bool)1" (and the same thing for FALSE), so the code which
  could be erroneously compiled previously such as doing "return FALSE" from
  a function returning a pointer would stop compiling now (but this change
  is not supposed to have any effects on valid code)

- another minor change: wxApp::OnAssert() has a new "cond" argument, you
  must modify YourApp::OnAssert() signature if you were using it to override
  the default assert handling.


All (GUI):

! the event type constants are not constants any more but are dynamically
  allocated during run-time which means that they can't be used as case labels
  in the switch()es, you must rewrite them to use if()s instead

  You may also define WXWIN_COMPATIBILITY_EVENT_TYPES to get the old behaviour
  but this is strongly discouraged, please consider changing your code
  instead!

! wxDialog does not derive from wxPanel any longer - if you were using it in
  your code, please update it. The quick fix for the most cases is to replace
  the occurrences of wxPanel with wxWindow.

! if you handle (and don't skip) EVT_KEY_DOWN, the EVT_CHAR event is not
  generated at all, so you must call event.Skip() in your OnKeyDown() if
  you want to get OnChar() as well

- in general, the key events sent for the various non ASCII key combinations
  have been changed to make them consistent over all supported platforms,
  please see the wxKeyEvent documentation for details

- wxYES_NO is now wxYES | wxNO and the manifest values of both wxYES and wxNO
  have changed (to fix some unfortunate clashes), please check your code to
  ensure that no tests for wxYES or wxNO are broken: for example, the following
  will *NOT* work any longer:

        if ( flags & wxYES_NO )
                ... do something ...
        if ( flags & wxYES )
                ... do something else ...

- wxGLCanvas now derives directly from wxWindow, not wxScrolledWindow

- wxGridCellAttrProvider class API changed, you will need to update your code
  if you derived any classes from it

- wxImage::ComputeHistogram()'s signature changed to 
  unsigned long ComputeHistogram(wxImageHistogram&) const

- wxEvtHandler cannot be copied/assigned any longer - this never worked but
  now it results in compile-time error instead of run-time crashes

- WXK_NUMLOCK and WXK_SCROLL keys no longer result in EVT_CHAR() events,
  they only generate EVT_KEY_DOWN/UP() ones

- the dialogs use wxApp::GetTopWindow() as the parent implicitly if the
  parent specified is NULL, use wxDIALOG_NO_PARENT style to prevent this
  from happening

- several obsolete synonyms are only retained in WXWIN_COMPATIBILITY_2_2 mode:
  for example, use wxScrolledWindow::GetViewStart() now instead of ViewStart()
  and GetCount() instead of Number() in many classes

- wxCmdLineParser does not use wxLog to output messages anymore.
  to obtain the previous behaviour, add
  wxMessageOutput::Set(new wxMessageOutputLog); to your program
  (you will need to #include <wx/msgout.h>)

wxMSW:

! build system changed: setup.h is not a static file in include/wx any more
  but is created as part of the build process under lib/<toolkit>/wx/include
  where <toolkit> is of the form (msw|univ)[dll][u][d]. You'll need to update
  the include path in your make/project files appropriately. Furthermore,
  xpm.lib is no longer used by wxMSW, it was superseded by the wxXPMDecoder
  class. You'll need to remove all references to xpm.lib from your 
  make/project files.

- child frames appear in the taskbar by default now, use wxFRAME_NO_TASKBAR
  style to avoid it

- all overloads of wxDC::SetClippingRegion() combine the given region with the
  previously selected one instead of replacing it

- wxGetHomeDir() uses HOME environment variable and if it is set will not
  return the programs directory any longer but its value (this function has
  never been meant to return the programs directory anyhow)

- wxHTML apps don't need to include wx/html/msw/wxhtml.rc in resources file
  anymore. The file was removed from wxMSW


Unix ports:

! You should use `wx-config --cxxflags` in your makefiles instead of
  `wx-config --cflags` for compiling C++ files. CXXFLAGS contains CFLAGS
  and the compiler flags for C++ files only, CFLAGS should still be used
  to compile pure C files.


wxThread and related classes:

- The thread-related classes have been heavily changed since 2.2.x versions
  as the old code had many serious problems. This could have resulted in
  semantical changes other than those mentioned here, please review use of
  wxThread, wxMutex and wxCondition classes in your code.

! wxCondition now *must* be used with a mutex, please read the (updated) class
  documentation for details and revise your code accordingly: this change was
  unfortunately needed as it was impossible to ensure the correct behaviour
  (i.e. absense of race conditions) using the old API.

- wxMutex is not recursive any more in POSIX implementation (it hasn't been
  recursive in 2.2.x but was in 2.3.1 and 2.3.2), please refer to the class
  documentation for the discussion of the recursive mutexes.

- wxMutex::IsLocked() doesn't exist any more and should have never existed:
  this is was unique example of a thread-unsafe-by-design method.


OTHER CHANGES
=============

2.3.3
-----

wxBase:

- wxSemaphore class added, many fixed to wxCondition and wxThread (K.S. Sreeram)
- fixes to the command line parsing error and usage messages
- modified wxFileName::CreateTempFileName() to open the file atomically
  (if possible) and, especially, not to leak the file descriptors under Unix
- memory leak in wxHTTP fixed (Dimitri)
- fixes to AM_PATH_WXCONFIG autoconf macro
- added wxHashMap class that replaces type-unsafe wxHashTable and is modelled
  after (non standard) STL hash_map
- wxLocale now works in Unicode mode
- wxLocale can now load message catalogs in arbitrary encoding
- fixed the bug related to the redrawing on resize introduced in 2.3.2
- added static wxFontMapper::Get() accessor (use of wxTheFontMapper is now
  deprecated)
- added wxShutdown() function (Marco Cavallini)
- added wxEXPLICIT macro

Unix (Base/GUI):

- wxWindows may be built using BSD and Solaris (and possibly other) make
  programs and not only GNU make
- wxTCP-based IPC classes now support communicating over Unix domain sockets
- wxWindows may be built as a dynamic shared library under Darwin / Mac OS X
  lazy linking issues have been solved by linking a single module (.o) into
  the shared library (two step link using distrib/mac/shared-ld-sh)
- fixed thread priority setting under Linux

All (GUI):

- it is now possible to set the icons of different sizes for frames (e.g. a
  small and big ones) using the new wxIconBundle class
- implemented radio menu items and radio toolbar buttons
- added possibility to show text in the toolbar buttons
- added wxArtProvider class that can be used to customize the look of standard
  wxWindows dialogs
- significantly improved native font support
- wxImage::ComputeHistogram() now uses wxImageHistogram instead of type-unsafe
  wxHashTable
- added IFF image handler
- fixed using custom renderers in wxGrid which was broken in 2.3.2
- support for multiple images in one file added to wxImage (TIFF, GIF and ICO formats)
- support for CUR and ANI files in wxImage added (Chris Elliott)
- wxTextCtrl::GetRange() added
- added wxGetFontFromUser() convenience function
- added EVT_MENU_OPEN and EVT_MENU_CLOSE events
- added Hungarian translations (Janos Vegh)
- added wxImage::SaveFile(filename) method (Chris Elliott)
- added wxImage::FloodFill and implemented wxWindowDC::DoFloodFill method
  for GTK+, Mac, MGL, X11, Motif ports (Chris Elliott)
- added (platform-dependent) scan code to wxKeyEvent (Bryce Denney)
- added wxTextCtrl::EmulateKeyPress()
- Added wxMouseCaptureChangedEvent
- Added custom character filtering to wxTextValidator
- wxTreeCtrl now supports incremental keyboard search
- wxHelpProvider::RemoveHelp added and called from ~wxWindowBase
  so that erroneous help strings are no longer found as the hash
  table fills up
- updated libpng from 1.0.3 to 1.2.4
- Added wxView::OnClosingDocument so the application can do
  cleanup.
- generic wxListCtrl renamed to wxGenericListCtrl, wxImageList
  renamed to wxGenericImageList, so they can be used on wxMSW
  (Rene Rivera).

wxMSW:

- small appearance fixes for native look under Windows XP
- fixed multiple bugs in wxExecute() with IO redirection
- refresh the buttons properly when the window is resized (Hans Van Leemputten)
- huge (40*) speed up in wxMask::Create()
- changing wxWindows styles also changes the underlying Windows window style
- wxTreeCtrl supports wxTR_HIDE_ROOT style (George Policello)
- fixed flicker in wxTreeCtrl::SetItemXXX()
- fixed redraw problems in dynamically resized wxStaticText
- improvements to wxWindows applications behaviour when the system colours
  are changed
- fixed wxProgressDialog for ranges > 65535
- wxSpinButton and wxSpinCtrl now support full 32 bit range (if the version
  of comctl32.dll installed on the system supports it)
- wxFontEnumerator now returns all fonts, not only TrueType ones
- bugs in handling wxFrame styles (border/caption related) fixed
- showing a dialog from EVT_RADIOBUTTON handler doesn't lead to an infinite
  recursion any more
- wxTextCtrl with wxTE_RICH flag scrolls to the end when text is appended to it
- the separators are not seen behind the controls added to the toolbar any more
- wxLB_SORT style can be used with wxCheckListBox
- wxWindowDC and wxClientDC::GetSize() works correctly now
- Added wxTB_NODIVIDER and wxTB_NOALIGN so native toolbar can be used in FL
- Multiline labels in buttons are now supoprted (simply use "\n" in the label)
- Implemented wxMouseCaptureChangedEvent and made wxGenericDragImage check it
  has the capture before release it.
- fixed bugs in multiple selection wxCheckListBox
- default button handling is now closer to expected
- setting tooltips for wxSlider now works
- multiple events avoided in wxComboBox
- tooltip asserts avoided for read-only wxComboBox
- fixed a race condition during a thread exit and a join
- fixed a condition where a thread can hang during message/event processing
- increased space between wxRadioBox label and first radio button
- don't fail to register remaining window classes if one fails to register

wxGTK:

- wxDirDialog now presents the file system in standard Unix way
- wxButton now honours wxBU_EXACTFIT
- wxStaticBox now honours wxALIGN_XXX styles
- added support for non alphanumeric simple character accelerators ('-', '=')
- new behaviour for wxWindow::Refresh() as it now produces a delayed refresh. 
  Call the new wxWindow::Update() to force an immediate update
- support for more SGI hardware (12-bit mode among others)
- fixed wxDC::Blit() to honour source DC's logical coordinates
- implemented wxIdleEvent::RequestMore() for simple background tasks
- implemented wxChoice::Delete()
- fixed bad memory leak in wxFileDialog (Chris Elliott)
- made internal GC pool dynamically growable

wxMotif:

- improved colour settings return values (Ian Brown)
- improved border style handling for wxStaticText (Ian Brown)
- improved toolbar control alignment
- implemented wxSpinButton
- implemented wxCheckListBox
- fixed wxSpinCtrl and wxStaticLine when used with sizers
- wxStaticBitmap now shows transparent icons correctly

wxHTML:

- fixed wxHtmlHelpController's cache files handling on big endian machines
- added blocking and redirecting capabilities to wxHtmlWindow via
  wxHtmlWindow::OnOpeningURL()
- fixed alignment handling in tables
- fixed <font face="..."> handling to be case insensitive

2.3.2
-----

New port: wxUniv for Win32/GTK+ is now included in the distribution.

wxBase:

- wxRegEx class added
- wxGetDiskSpace() function added (Jonothan Farr, Markus Fieber)
- wxTextBuffer and wxTextFile(wxStream) added (Morten Hanssen)
- more fixes to wxMBConv classes. Conversion to and from wchar_t now works with
  glibc 2.2 as well as with glibc 2.1. Unix version now checks for iconv()'s
  capabilities at runtime instead of in the configure script.

All (GUI):

- support for virtual list control added
- column images in report mode of the list control
- wxFindReplaceDialog added (based on work of Markus Greither)
- wxTextCtrl::SetMaxLength() added (wxMSW/wxGTK)
- polygon support in wxRegion (Klaas Holwerda)
- wxStreamToTextRedirector to allow easily redirect cout to wxTextCtrl added
- fixed bug with using wxExecute() to capture huge amounts of output
- new wxCalendarCtrl styles added (Søren Erland Vestø)
- wxWizard changes: loading from WXR support, help button (Robert Cavanaugh)
- wxDirSelector() added (Paul A. Thiessen)
- wxGrid cell editing veto support (Roger Gammans)
- wxListCtrl ITEM_FOCUSED event added
- support for ICO files in wxImage added (Chris Elliott)
- improvements to wxDragImage (Chuck Messenger)

wxMSW:

- support for the DBCS fonts (CP 932, 936, 949, 950) (Nathan Cook)
- new library naming convention under VC++ -- please change your application
  project files

wxGTK:

- fixed popup menu positioning bug
- fixed the edit function for wxListCtrl (Chuck Messenger)
- fixed the key-hitting events for wxListCtrl and wxTreeCtrl, so they
  correctly return the key which was pressed (Chuck Messenger)

wxMac:

- support for configuration and build under Mac OS X using the Apple Developer
  Tools

wxHTML:

- new HTML parser with correct parsing of character entities and fixes
  to tags parsing
- added support for animated GIFs

2.3.1
-----

wxBase:

- Fixes for gcc 3.0
- Fixed new charset detection code
- ODBC Informix fixes (submitted by Roger Gammans)
- Added ODBC date support to wxVariant
- Added wxDir::Traverse
- Added wxSingleInstanceChecker class
- Removed redundant wxDebugContext functions using C++ streams,
  so now standard stream usage should be unnecessary

All (GUI):

- Added wxDbGrid class for displaying ODBC tables
- Added EVT_GRID_EDITOR_CREATED and wxGridEditorCreatedEvent so the
  user code can get access to the edit control when it is created, (to
  push on a custom event handler for example)
- Added wxTextAttr class and SetStyle, SetDefaultStyle and
  GetDefaultStyle methods to wxTextCtrl
- Added wxSingleInstanceChecker
- Improvements to Tex2RTF
- Added Paul and Roger Gammans' grid controls
- Bug in wxDocument::Save logic corrected, whereby Save didn't save when not
  first-time saved
- Fixed memory leak in textcmn.cpp
- Various wxXML enhancements
- Removed wxCLIP_CHILDREN style from wxSplitterWindow
- Fixed memory leak in DoPrint, htmprint.cpp
- Fixed calendar sample bug with using wxCommandEvent::GetInt()
  instead of GetId()
- Added wxDbGrid combining wxODBC classes with wxGrid
- Added more makefiles and project files for contrib hierarchy

wxMSW:

- Fixed wxApp::ProcessMessage so controls don't lose their
  accelerators when the accelerators are redefined elsewhere
- Accelerators consisting of simple keystrokes (without control,
  alt or shift) now work
- Compile fixes for Watcom C++ added
- Compile fixes for Cygwin 1.0 added
- Use SetForegroundWindow() in wxWindow::Raise() instead of BringWindowToTop()
- Replaced wxYield() call in PopupMenu() by a much safer
  wxYieldForCommandsOnly() - fixes tree ctrl popup menu bug and other ones
- Enter processing in wxSpinCtrl fixed
- Fixed bug in determining the best listbox size
- Fix for wxFrame's last focus bug
- We now send iconize events
- Fixed wxFrame::SetClientSize() with toolbar bug
- Added mousewheel processing
- Added wxSystemSettings::Get/SetOption so we can configure
  wxWindows at run time; used this to implement no-maskblt option
  in wxDC
- Fixed bug when using MDIS_ALLCHILDSTYLES style: so now MDI
  child frame styles are honoured

wxGTK:

- Fixed slider rounding bug
- Added code to set wxFont's default encoding to wxLocale::GetSystemEncoding()
- We now send iconize events
- Fix for discrepancies between wxNotebookEvent and wxNotebook
  GetSelection() results

2.3.0
-----

wxBase:

- fixed problem with wxURL when using static version of the library
- wxZipFSHandler::FindFirst() and FindNext() now correctly list directories
- wxMimeTypesManager now can create file associations too (Chris Elliott)
- wxCopyFile() respects the file permissions (Roland Scholz)
- wxFTP::GetFileSize() added (Søren Erland Vestø)
- wxDateTime::IsSameDate() bug fixed
- wxTimeSpan::Format() now behaves more as expected, see docs
- wxLocale now provides much more convenient API for setting language and
  detecting current system language. New API is more abstracted and truly
  cross-platform, independent of underlying C runtime library.

All (GUI):

- new wxToggleButton class (John Norris, Axel Schlueter)
- wxCalendarCtrl not highlighting the date with time part bug fixed
- wxADJUST_MINSIZE sizer flag added
- FindOrCreateBrush/Pen() bug fix for invalid colour values
- new wxXPMHandler for reading and writing XPM images
- added new (now recommended) API for conversion between wxImage and wxBitmap
  (wxBitmap::ConvertToImage() and wxBitmap::wxBitmap(wxImage&) instead of
  wxImage methods and ctor)
- ODBC classes now support DB2, Interbase, and Pervasive SQL
- ODBC documentation complete!!
- ODBC classes have much Unicode support added, but not complete
- ODBC experimental BLOB support added, but not completely tested
- ODBC NULL column support completed (Roger/Paul Gammans)
- ODBC All "char *" and char arrays removed and replaced with wxString use

wxMSW:

- threads: bug in wxCondition::Broadcast fixed (Pieter van der Meulen)
- fixed bug in MDI children flags (mis)handling
- it is possible to compile wxCHMHelpController with compilers
  other than Visual C++ now and hhctrl.ocx is loaded at runtime

wxGTK:

- added support for wchar_t (wxUSE_WCHAR_T) under Unix

wxHTML:

- mew feature, wxHtmlProcessor for on-the-fly modification of HTML markup
- visual enhancements to contents panel of wxHtmlHelpController

2.2.0
-----

wxBase:

- Fixed bug with directories with trailing (back)slashes in wxPathExists
- wxString: added wxArrayString::operator==() and !=()
- Fixes for wxCmdLineParser
- Added wxGetLocalTimeMillis
- Completed Czech translations
- Some stream corrections
- added missing consts to wxPoint operators
- wxDateTime ParseFormat fixes
- wxFile::Open(write_append) will create file if it doesn't exist
- small fixes to MIME mailcap test command handling, more MIME tests in the sample

All (GUI):

- wxGenericDragImage now allows virtual image drawing, and
  flicker-free dragging is now possible
- Added wxPrinter::GetLastError
- Fixed wxLogGui reentrancy problem
- Paper names now translated
- wxGrid fixes
- Generic validator now caters for more cases (integers in
  wxTextCtrl, strings in wxChoice, wxComboBox)
- Fixed crash when docview On... functions return FALSE. Show
  error message when an non-existent filename is typed into the Open
  File dialog.
- Corrected Baltic font encoding handling
- wxImage: enhanced TIFF code, added new platform-independent BMP
  writing code
- wxKeyEvent::GetKeyCode() and HasModifiers() added and documented
- Fixed wxPropertyForm crashes in sample
- wxWizard now calls TransferDataFromWindow() before calling
  wxWizardPage::GetNext() fixing an obvious bug

wxMSW:

- wxWindow::GetCharWidth/Height now calculated accurately.
  This will affect all .wxr dialog resources, so for
  backward compatibility, please set
  wxDIALOG_UNIT_COMPATIBILITY to 1 in setup.h
- wxListCtrl: set item text in LIST_ITEM_ACTIVATED events
- wxTextCtrl: implemented setting colours for rich edit controls
- wxColour now accepts both grey and gray
- BC++ DLL compilation fixed
- Watcom C++ makefiles improved for JPEG and TIFF compilation
- Fixed submenu accelerator bug
- Fixed dialog focus bug (crash if the previous window to have
  the focus was destroyed before the dialog closed)
- Too-small default wxTextCtrl height fixed
- fixed "missing" initial resize of wxMDIChildFrame
- wxFrame restores focus better
- Now ignore wxTHICK_FRAME in wxWindow constructor: only relevant to
  frames and dialogs, interferes with other window styles otherwise
  (sometimes you'd get a thick frame in a subwindow)
- wxTextCtrl insertion point set to the beginning of the control by SetValue
- Fix so wxMDIParentFrame is actually shown when Show(TRUE) is called.
- wxFileDialog: adjusts struct size if there's an error (struct
  sizes can be different on different versions of Windows)
- wxImageList::GetSize() documented and added to wxMSW
- fixed default dialog style to make them non resizeable again
- fixed wxFrame::IsShown() which always returned TRUE before

wxGTK:

- Please see docs/gtk/changes.txt.

wxMotif:

- Small compilation fixes

Documentation:

- wxCaret documented

2.1.16
------

wxBase:

All (GUI):

wxMSW:

- Various bug fixes
- Added wxCHMHelpController, for invoking MS HTML Help
  files. This works under VC++ only
- Modal dialog handling improved
- Printer dialog now modal

wxGTK:

- Various bug fixes

wxMotif:

- Various bug fixes

2.1.15
------

Documentation:

- Added docs/tech for technical notes

File hierarchy:

- Started new contrib hierarchy that mirrors
  the main lib structure; moved OGL and MMedia into it

wxBase:

- wxSocket support
- wxDateTime replaces and extends old wxDate and wxTime classes (still
  available but strongly deprecated) with many new features
- wxLongLong class provides support for (signed) 64 bit integers
- wxCmdLineParser class for parsing the command line (supporting short and
  long options, switches and parameters of different types)
- it is now possible to build wxBase under Win32 (using VC++ only so far)
  and BeOS (without thread support yet)
- wxThread class modified to support both detached and joinable threads, also
  added new GetCPUCount() and SetConcurrency() functions (useful under Solaris
  only so far)
- wxDir class for enumerating files in a directory
- wxLog functions are now (more) MT-safe
- wxStopWatch class, timer functions have more chances to return correct
  results for your platform (use ANSI functions where available)
- wxString::ToLong, ToULong, ToDouble methods and Format() static one added
- buffer overflows in wxString and wxLog classes fixed (if snprintf() function
  is available)
- wxArray::RemoveAt() replaces deprecated wxArray::Remove(index)

all (GUI):

- Added wxImage::Rotate.
- new wxCalendarCtrl class for picking a date interactively
- wxMenu(Bar)::Insert() and Remove() functions for dynamic menu management
- wxToolBar supports arbitrary controls (not only buttons) and can be
  dynamically changed (Delete/Insert functions)
- vertical toolbars supported by MSW and GTK native wxToolBar classes
- wxTreeCtrl and wxListCtrl allow setting colour/fonts for individual items
- "file open" dialog allows selecting multiple files at once (contributed by
  John Norris)
- wxMimeTypesManager uses GNOME/KDE MIME database to get the icons for the
  MIME types if available (Unix only)
- wxDC::DrawRotatedText() (based on contribution by Hans-Joachim Baader)
- TIFF support added (libtiff required and included in the distribution)
- PCX files can now be written (256 and 24 bits)
- validators may work recursively if wxWS_EX_VALIDATE_RECURSIVELY is set
- wxScrolledWindow now has keyboard interface
- wxTextEntryDialog may be used for entering passwords (supports wxTE_PASSWORD)
- added wxEncodingConverter and improved wxFontMapper
  for dealing with conversions between different encodings,
  charsets support in wxLocale and wxHTML
- wxDragImage class added
- samples/help improved to show standard and advanced HTML help
  controllers, as well as native help
- moved wxTreeLayout class to main lib

wxMSW:

- wxFrame::MakeFullScreen added.
- support for enhanced metafiles added, support for copying/pasting metafiles
  (WMF and enhanced ones) fixed/added.
- implemented setting colours for push buttons
- wxStatusBar95 may be now used in dialogs, panels (not only frames) and can be
   positioned along the top of the screen and not only at the bottom
- wxTreeCtrl::IsVisible() bug fixed (thanks to Gary Chessun)
- loading/saving big (> 32K) files in wxTextCtrl works
- tooltips work with wxRadioBox
- wxBitmap/wxIcon may be constructed from XPM included into a program, as in
  Unix ports
- returning FALSE from OnPrintPage() aborts printing
- VC++ makefiles and project files made (mostly) consistent
- wxSetCursorEvent added

wxGTK:

- wxFontMapper endless recursion bug (on some systems) fixed
- wxGTK synthesizes wxActivateEvents
- UpdateUI handlers may be used with wxTextCtrl

wxMotif:

- wxMenu::Enable works
- wxToolBar bugs fixed
- OGL samples made to work again

wxHTML:

- almost complete rewrite of wxHtmlHelpController,
  including faster search, bookmarks, printing, setup dialog
  and cross-platform binary compatible .cached files for faster
  loading of large helpbooks, case insensitive search
  split into 3 parts: wxHtmlHelpData, Frame and Controller
- added support for charsets and <meta> tag
- added support for font faces and justified paragraphs,
  taken some steps to prepare wxHTML for frames
- added dynamic pushing/popping of wxHtmlParser tag handlers
- improved HTML printing
- added extensive table of HTML characters substitutions (&nbsp; etc.)
- fixed wxHtmlWindow flickering, several minor bugfixes
- added some tags: <address>, <code>, <kbd>, <samp>, <small>, <big>,
  fixed handling of relative and absolute font sizes in <font size>


NOTE: for changes after wxWindows 2.1.0 b4, please see the CVS
change log.

2.1.0, b4, May 9th 1999
-----------------------

wxGTK:

- JPEG support added.
- Many fixes and changes not thought worth mentioning in this file :-)

wxMSW:

- wxNotebook changes: can add image only; wxNB_FIXEDWIDTH added;
  SetTabSize added.
- JPEG support added.
- Fixes for Cygwin compilation.
- Added wxGA_SMOOTH and wxFRAME_FLOAT_ON_PARENT styles.
- Many fixes people didn't tell this file about.

wxMotif:


General:

- Some changes for Unicode support, including wxchar.h/cpp.


2.0.1 (release), March 1st 1999
-------------------------------

wxGTK:

- wxGLCanvas fixes.
- Slider/spinbutton fixes.

wxMSW:

- Fixed problems with <return> in dialogs/panels.
- Fixed window cursor setting.
- Fixed toolbar sizing and edge-clipping problems.
- Some makefile fixes.

wxMotif:

- None.

General:

- Added wxUSE_SOCKETS.
- More topic overviews.
- Put wxPrintPaperType, wxPrintPaperDatabase into
  prntbase.h/cpp for use in non-PostScript situations
  (e.g. Win16 wxPageSetupDialog).


Beta 5, February 18th 1999
--------------------------

wxGTK:

- wxExecute improved.

wxMSW:

- Fixed wxWindow::IsShown (::IsWindowVisible doesn't behave as
  expected).
- Changed VC++ makefiles (.vc) so that it's possible to have
  debug/release/DLL versions of the library available simultaneously,
  with names wx.lib, wx_d.lib, wx200.lib(dll), wx200_d.lib(dll).
- Added BC++ 5 IDE files and instructions.
- Fixed wxChoice, wxComboBox constructor bugs (m_noStrings initialisation).
- Fixed focus-related crash.

wxMotif:

- Cured asynchronous wxExecute crash.
- Added repaint event handlers to wxFrame, wxMDIChildFrame.

General:

- wxLocale documented.
- Added include filenames to class reference.
- wxHelpController API changed: SetBrowser becomes SetViewer,
  DisplaySection works for WinHelp, help sample compiles under Windows
  (though doesn't display help yet).

Beta 4, February 12th 1999
--------------------------

wxGTK:

- Miscellaneous fixes.

wxMSW:

- Makefiles for more compilers and samples; Cygwin makefiles
  rationalised.
- Added VC++ project file for compiling wxWindows as DLL.

wxMotif:

- Added OnEraseBackground invocation.
- Added wxRETAINED implementation for wxScrolledWindow.
- Cured scrolling display problem by adding XmUpdateDisplay.
- Tried to make lex-ing in the makefile more generic (command line
  syntax should apply to both lex and flex).
- Changed file selector colours for consistency (except for buttons:
  crashes for some reason).
- Fixed wxMotif version of wxImage::ConvertToBitmap (used new instead
  of malloc, which causes memory problems).

General:

- Further doc improvements.
- wxGenericValidator added.
- Added wxImageModule to image.cpp, so adds/cleans up standard handlers
  automatically.

Beta 3, January 31st 1999
-------------------------

wxGTK:

- wxClipboard/DnD API changes (still in progress).
- wxToolTip class added.
- Miscellaneous fixes.

wxMSW:

- wxRegConfig DeleteAll bug fixed.
- Makefiles for more compilers.
- TWIN32 support added.
- Renamed VC++ makefiles from .nt to .vc, and
  factored out program/library settings.
- Fixed wxIniConfig bug.

wxMotif:

- A few more colour fixes.
- wxGLCanvas and OpenGL samples working.
- Some compiler warnings fixed.
- wxChoice crash fix.
- Dialog Editor starting to work on Motif.

General:

- wxBusyCursor class added.
- Added samples/dde.
- More doc improvements, incl. expanding docs/html/index.htm.

Beta 2, January 1999
--------------------

wxGTK:

wxMSW:

- 16-bit BC++ compilation/linking works albeit without the resource system.

wxMotif:

- Cured wxScreenDC origin problem so e.g. sash window sash is drawn at
  the right place.
- Cured some widget table clashes.
- Added thread support (Robert).
- wxPoem sample now works.

General:

- Rearranged documentation a bit.
- Sash window uses area of first frame/dialog to paint over when drawing
  the dragged sash, not just the sash window itself (it clipped to the right
  or below).
- Made resource sample use the correct Cancel button id.
- Moved wxProp to main library (generic directory), created proplist
  sample.
- Added bombs and fractal samples.

Beta 1, December 24th 1998
--------------------------

wxGTK:

- Various

wxMSW, wxMotif: not in sync with this release.


Alpha 18, December 29th 1998
----------------------------

wxMSW:

- Win16 support working again (VC++ 1.5)
- Win16 now uses generic wxNotebook, wxListCtrl,
  wxTreeCtrl -- more or less working now, although
  a little work on wxNotebook is still needed.
  Under 16-bit Windows, get assertion when you click
  on a tab.
- Wrote 16-bit BC++ makefiles: samples don't yet link.
- Added CodeWarrior support to distribution courtesy
  of Stefan Csomor.

wxMotif:

- Cured scrolling problem: scrollbars now show/hide themselves
  without (permanently) resizing the window.
- Removed some commented-out lines in wxScrolledWindow::AdjustScrollbars
  that disabled scrollbar paging.
- Set background colour of drawing area in wxWindow, so e.g. wxListCtrl
  colours correctly.
- Removed major bug whereby dialogs were unmanaged automatically
  when any button was pressed.
- Fixed colours of wxWindow scrollbars, made list and text controls
  have a white background.
- Fixed dialog colour setting.
- Added settable fonts and colours for wxMenu/wxMenuBar. Now
  they have sensible colours by default.
- Fixed a bug in wxStaticBox.
- Cured wxTreeCtrl bug: now works pretty well!
- Debugged DrawEllipticArc (a ! in the wrong place).
- Added SetClippingRegion( const wxRegion& region ).
- Added wxPoint, wxSize, wxRect versions of SetSize etc.

Alpha 17, November 22nd 1998
----------------------------

wxMSW:

- More documentation updates, especially for
  wxLayoutWindow classes and debugging facilities.
- Changed wxDebugContext to use wxDebugLog instead
  of wxTrace.
- Now supports VC++ 6.0, and hopefully BC++ 5.0.
  However, DLL support may be broken for BC++ since
  VC++ 6 required changing of WXDLLEXPORT keyword
  position.
- Numerous miscellaneous changes.

wxMotif:

- Reimplemented MDI using wxNotebook instead of the MDI widgets, which
  were too buggy (probably not design for dynamic addition/removal of
  child frames).
- Some improvements to the wxNotebook implementation.
- wxToolBar now uses a bulletin board instead of a form, in an attempt
  to make it possible to add ordinary wxControls to a toolbar.
- Cured problem with not being able to use global memory operators,
  by defining two more global operators, so that the delete will match
  the debugging implementation.
- Added wxUSE_DEBUG_NEW_ALWAYS so we can distinguish between using
  global memory operators (usually OK) and #defining new to be
  WXDEBUG_NEW (sometimes it might not be OK).
- Added time.cpp to makefile; set wxUSE_DATETIME to 1.
- Added a parent-existence check to popup menu code to make it not crash.
- Added some optimization in wxWindow::SetSize to produce less flicker.
  It remains to be seen whether this produces any resize bugs.

It's a long time since I updated this file. Previously done:

- wxFrame, wxDialog done.
- wxScrolledWindow done (but backing pixmap not used at present).
- wxBitmap done though could be tidied it up at some point.
- Most basic controls are there, if not rigorously tested.
- Some MDI support (menus appear on child frames at present).
- wxNotebook almost done.
- wxToolBar done (horizontal only, which would be easy to extend
  to vertical toolbars).

More recently:

- Colour and font changing done (question mark over what happens
  to scrollbars).
- Accelerators done (for menu items and buttons). Also event loop
  tidied up in wxApp so that events are filtered through ProcessXEvent.
- wxWindow::GetUpdateRegion should now work.

Alpha 16, September 8th 1998
----------------------------

wxMSW:

- Added wxSashWindow, wxSashLayoutWindow classes, and sashtest
  sample.
- Guilhem's socket classes added, plus wxsocket sample.
- A few more makefiles added.
- GnuWin32/BC++ compatibility mods.
- Further doc updates.
- wxProp updates for correct working with wxGTK.

wxMotif:

- First start at Motif port.
- Made makefiles for wxMotif source directory and minimal sample.
- First go at wxApp, wxWindow, wxDialog, wxPen, wxBrush, wxFont,
  wxColour, wxButton, wxCheckBox, wxTextCtrl, wxStaticText,
  wxMenu, wxMenuItem, wxMenuBar

Alpha 15, August 31st 1998
--------------------------

wxMSW:

- wxBitmap debugged.
- wxDC::GetDepth added.
- Contribution added whereby wxBitmap will be
  converted to DC depth if they don't match.
- wxConfig API improved, documentation updated.
- Printing classes name conventions cleaned up.
- wxUpdateUIEvent now derives from wxCommandEvent
  so event can travel up the window hierarchy.

Alpha 14, July 31st 1998
------------------------

wxMSW:

- Toolbar API has been simplified, and now
  wxFrame::GetClientArea returns the available client
  area when toolbar, status bar etc. have been accounted for.
  wxFrame::CreateToolBar added in line with CreateStatusBar.
- Documentation updates, incl. for wxToolBar.
- New wxAcceleratorTable class plus wxFrame::SetAcceleratorTable.
- Various additions from other folk, e.g. streams, wxConfig
  changes, wxNotebook.
- Added wxDocMDIParentFrame, wxDocMDIChildFrame for doc/view.

Alpha 13, July 8th 1998
-----------------------

wxMSW:

- Implemented wxPoint as identical to POINT on Windows, and
  altered wxDC wxPoint functions to use wxPoint directly in
  Windows functions, for efficiency.
- Cured wxASSERT bug in wxStatusBar95.
- #ifdefed out some bits in oleutils.cpp for compilers that
  don't support it.
- Added some operators to wxPoint, wxSize.
- Added inline wxDC functions using wxPoint, wxSize, wxRect.

Alpha 12, July 7th 1998
-----------------------

wxMSW:

- Added wxApp::GetComCtl32Version, and wxTB_FLAT style, so can
  have flat toolbars on Win98 or Win95 with IE >= 3 installed.

Alpha 11, July 3rd 1998
-----------------------

wxMSW:

- Added thread.h, thread.cpp.
- Changed Enabled, Checked to IsEnabled, IsChecked in wxMenu,
  wxMenuBar.
- Changed wxMenuItem::SetBackColor to SetBackgroundColour,
  SetTextColor to SetTextColour, and added or made public several
  wxMenuItem accessors.
- Added two overloads to wxRegion::Contains. Added
  wxRegion::IsEmpty for a more consistent naming convention.
- Added Vadim's wxDataObject and wxDropSource.
- ENTER/LEAVE events now work.
- Cured wxMemoryDC bug where the DC wasn't being deleted.
- Cured wxGauge SetSize major bugginess.
- Cured problem where if a GDI object was created on the stack,
  then went out of scope, then another object was selected into
  the DC, GDI objects would leak. This is because the assignment
  to e.g. wxDC::m_pen would delete the GDI object without it first
  being selected out of the DC. Cured by selecting the old DC object
  first, then doing the assignment.
- Split up wxGaugeMSW, wxGauge95, wxSliderMSW, wxSlider95
- Various other bug fixes and additions.

Generic:

- Major work on Dialog Editor (still plenty to go).
- Expanded documentation a bit more.

Alpha 10, May 7th 1998
----------------------

wxMSW:

- Added desiredWidth, desiredHeight parameters to wxBitmapHandler
  and wxIcon functions so that you can specify what size of
  icon should be loaded. Probably will remain a Windows-specific thing.
- wxStatusBar95 now works for MDI frames.
- Toolbars in MDI frames now behave normally. They still
  require application-supplied positioning code though.
- Changed installation instructions, makefiles and batch files
  for compiling with Gnu-Win32/Mingw32/EGCS. Also timercmn.cpp
  change to support Mingw32/EGCS. Bison now used by default.

Alpha 9, April 27th 1998
------------------------

wxMSW:

- Cured bug in wxStatusBar95 that caused a crash if multiple
  fields were used.
- Added Gnu-Win32 b19/Mingw32 support by changing resource
  compilation and pragmas.
- Cured wxMenu bug introduced in alpha 8 - didn't respond to
  commands because VZ changed the id setting in wxMenu::MSWCommand.

Generic:

- Corrected some bugs, such as the wxModule compilation problem.
- Added Gnu-Win32 b19/Mingw32 support by changing resource
  compilation and pragmas.
- Changed SIZEOF to WXSIZEOF.

Alpha 8, April 17th 1998
------------------------

wxMSW:

- Added IsNull to wxGDIObject to check if the ref data is present or not.
- Added PNG handler and sample - doesn't work for 16-bit PNGs for
  some reason :-(
- Added wxJoystick class and event handling, and simple demo.
- Added simple wxWave class. Needs Stop() function.
- Added wxModule (module.h/module.cpp) to allow definition
  of modules to be initialized and cleaned up on wxWindows
  startup/exit.
- Start of Mingw32 compatibility (see minimal and dialogs samples
  makefile.m95 files, and install.txt).
- Note: Windows printing has stopped working... will investigate.
VADIM'S CHANGES:
- Updated wxString: bug fixes, added wxArrayString, some
  compatibility functions.
- Updated log.h/cpp, added wxApp::CreateLogTarget.
- file.h: new wxTempFile class.
- defs.h: added wxSB_SIZE_GRIP for wxStatusBar95
- statbr95: wxStatusBar95 control.
- registry.h/cpp: wxRegKey class for Win95 registry.
- listbox.cpp: corrected some bugs with owner-drawn listboxes.
- wxConfig and wxFileConfig classes.

Generic:

- Added src/other/png, src/other/zlib directories.
- Added samples/png.
- IMPORTANT: Changed 'no id' number from 0 to -1, in wxEVT_ macros.
  Porters, please check particularly your wxTreeCtrl and wxListCtrl
  header files.
- Added modules.h/cpp, config.cpp, fileconf.cpp, textfile.cpp/h.

Alpha 7, March 30th 1998
------------------------

wxMSW:

- Added tab classes, tab sample.
- Now can return FALSE from OnInit and windows will be
  cleaned up properly before exit.
- Improved border handling so panels don't get borders
  automatically.
- Debugged MDI activation from Window menu.
- Changes to memory debug handling, including checking for
  memory leaks on application exit - but see issues.txt for
  unresolved issues.
- Added wxTaskBarIcon (taskbar.cpp/h, plus samples/taskbar)
  to allow maintenance of an icon in the Windows 95 taskbar
  tray area.
- Got MFC sample working (MFC and wxWindows in the same
  application), partly by tweaking ntwxwin.mak settings.
- Got DLL compilation working again (VC++).
- Changed wxProp/Dialog Editor filenames.

Generic:

- Added tab classes, tab sample.
- Revised memory.cpp, memory.h slightly; memory.h now #defines
  new to WXDEBUG_NEW in DEBUG mode. Windows implementation app.cpp
  now checks for leaks on exit. Added memcheck sample.
  See src/msw/issues.txt for more details.
- resource.h, resource.cpp changed to make wxDefaultResourceTable
  a pointer. Now initialize resource system with
  wxInitializeResourceSystem and wxCleanUpResourceSystem, to
  allow better control of memory.
- wxString now derives from wxObject, to enable memory leak
  checking.
- Added some #include fixes in various files, plus changed
  float to long in wxToolBar files.

Alpha 6, March 10th 1998
------------------------

wxMSW:

- Found stack error bug - stopped unwanted OnIdle recursion.
- Removed bug in wxTreeCtrl::InsertItem I added in alpha 5.
- Changed exit behaviour in wxApp/wxFrame/wxDialog. Now will
  check if the number of top-level windows is zero before
  exiting. Also, wxApp::GetTopWindow will return either
  m_topWindow or the first member of wxTopLevelWindows, so you
  don't have to call wxApp::SetTopWindow.
- Added dynarray.h/dynarray.cpp (from Vadim).
- Added first cut at OLE drag and drop (from Vadim). dnd sample
  added. Drop target only at this stage. See src/msw/ole/*.cpp,
  wx/include/msw/ole/*.h. WIN32 only because of UUID usage.
  Doesn't work with GnuWin32 - no appropriate headers e.g. for
  IUnknown.
  Doesn't work with BC++ either - crashes on program startup.
- Added Vadim's owner-draw modifications - will probably remain
  Windows-only. This enhances wxMenu, wxListBox. See ownerdrw sample.
- Added wxLB_OWNERDRAW for owner-draw listboxes.
- Vadim's wxCheckListBox derives from wxListBox. See checklst sample.
  Doesn't entirely work for WIN16.
- Vadim has added wxMenuItem as a separate file menuitem.cpp. It
  can also be used as an argument to wxMenu::Append, not just for
  internal implementation.
- Some #ifdefs done for MINGW32 compilation (just alter OPTIONS
  in makeg95.env, together with mingw32.bat). However, resource
  binding is not working yet so most apps with dialogs crash.

Generic:

- Added Vadim's dynarray.h, dynarray.cpp.
- Added Vadim's menuitem.cpp.
- Added Windows-specific wxCheckListBox,
  owner-draw wxListBox, and drag-and-drop
  (see docs/msw/changes.txt).

Alpha 5, 14th February 1998
--------------------------

wxMSW:

- GENERIC AND MSW-SPECIFIC CODE NOW TREATED AS TWO SEPARATE
  DISTRIBUTIONS. This change log will therefore now refer to
  the Windows-specific code only. See docs/changes.txt for generic
  changes.
- Removed Windows-specific reference counting system (GDI
  resources were cleaned up in idle time) - minimal
  advantages now we have a wxWin reference counting system.
- Added missing WXDLLEXPORT keywords so DLL compilation works
  again.
- Removed most warnings for GnuWin32 compilation.
- Added wxRegion/wxRegionIterator, but haven't yet used it in
  e.g. wxDC.

Generic:

- GENERIC AND MSW-SPECIFIC CODE NOW TREATED AS TWO SEPARATE
  DISTRIBUTIONS. This change log will therefore now refer to
  the generic code only. See docs/msw/changes.txt for Windows-specific
  changes.
- Readmes, change logs and installation files now go in
  platform-specific directories under docs, e.g. docs/msw,
  docs/gtk.
- Added DECLARE_APP and IMPLEMENT_APP macros so wxApp object gets
  created dynamically, not as a global object.
- Put wxColour into wx/msw/colour.h, src/msw/colour.cpp.
- Changed names of some include/wx/generic headers to be
  consistent and to conform to gcc pragma conventions. Also
  changed choicesg.cpp to choicdgg.cpp.
- Added gcc pragmas.
- Added gtk inclusion in include/wx headers.
- Added consistent file headings to source and headers.
- Removed lang.cpp, lang.h and references to wxSTR_... variables;
  added a few references to wxTransString.
- Added operator to wxTransString that converts automatically
  to wxString, so we can say e.g. wxMessageBox(wxTransString("Hello"), ...).
- samples/internat now works (minimally).
- Added wxMouseEvent::GetPosition and
  wxMouseEvent::GetLogicalPosition, both returning wxPoints.
- Made wxSize and wxRect contain longs not ints.
- Cured some memory leaks (thanks Vadim).
- Tidied up OnIdle and introduced RequestMore/MoreRequested so
  will only keep processing OnIdle if it returns TRUE from
  MoreRequested.

Alpha 4, 31st January 1998
--------------------------

All:

- Changed wxDC functions to take longs instead of floats. GetSize now takes
  integer pointers, plus a version that returns a wxSize.
- const keyword added to various wxDC functions.
- Under Windows, wxDC no longer has any knowledge of whether
  an associated window is scrolled or not. Instead, the device
  origin is set by wxScrolledWindow in wxScrolledWindow::PrepareDC.
- wxScrolledWindow applications can optionally override the virtual OnDraw
  function instead of using the OnPaint event handler. The wxDC passed to
  OnDraw will be translated by PrepareDC to reflect scrolling.
  When drawing outside of OnDraw, must call PrepareDC explicitly.
- wxToolBarBase/wxToolBarSimple similarly changed to allow for
  scrolling toolbars.
- Integrated wxPostScriptDC patches for 1.xx by Chris Breeze,
  to help printing with multiple pages.
- IPC classes given base classes (wxConnectionBase etc.) which
  define the API used by different implementations. DDE
  implementation updated to use these base classes.
- wxHelpInstance now separated into wxHelpControllerBase (base
  for all implementations), wxWinHelpController (uses standard
  WinHelp), wxXLPHelpController (talks to wxHelp by DDE or
  TCP/IP). There will be others eventually, such as
  wxHTMLHelpController for Microsoft (and Netscape?) HTML Help.
- Added Vadim Zeitlin's wxString class plus
  internationalization code (gettext simulation, wxLocale, etc.).
  New files from Vadim:
  include\wx\string.h
  include\wx\debug.h
  include\wx\file.h
  include\wx\log.h
  include\wx\intl.h
  src\common\string.cpp
  src\common\log.cpp
  src\common\intl.cpp
  src\common\file.cpp
  No longer use GNU wxString files.
- Split off file-related functions into include\wx\filefn.h and
  src\common\filefn.cpp.
- Borland C++ support (WIN32) for main library and
  samples, using makefile.b32 files.
- Preparation done for allowing BC++ to compile wxWin as a DLL,
  including changes to defs.h.
- wxIntPoint removed, wxPoint is now int, and wxRealPoint
  introduced.
- Added wxShowEvent (generated when window is being shown or
  hidden).
- Got minimal, docview, mdi samples working for 16-bit VC++ and
  cured 16-bit problem with wxTextCtrl (removed global memory
  trick).
- Updated GnuWin32 makefiles, checked minimal, mdi, docview samples.

Alpha 3, September 1997
-----------------------

All:

- wxListCtrl, wxTreeCtrl, wxImageList classes done.
- Instigated new file hierarchy, split files and classes up more logically.
- PrologIO and some other utils now put into core library.
- Revamped print/preview classes, added wxPageSetupDialog.
- Started documentation.

Alpha 2, 30th April 1997
------------------------

All:

- EVT_... macros now have at least one argument, for conformance
  with MetroWerks compiler.
- Added ids to .wxr file format.
- Got Dialog Editor compiled and running again but need
  to extend functionality to be in line with new controls.
  Added dialoged\test app to allow dynamic loading of .wxr files
  for testing purposes.
- Rewrote wxBitmap to allow installable file type
  handlers.
- Rewrote wxBitmapButton, wxStaticBitmap to not use Fafa.
- Wrote most of wxTreeCtrl and sample (need wxImageList to implement it
  fully).
- Added back wxRadioBox.
- Tidied up wx_main.cpp, wxApp class, putting PenWin code in
  a separate file.

Alpha 1, 5th April 1997
-----------------------

Generic:

At this point, the following has been achieved:

- A lot, but not all, of the code has been revamped for better
  naming conventions, protection of data members, and use of
  wxString instead of char *.
- Obsolete functionality deleted (e.g. default wxPanel layout,
  old system event system) and code size reduced.
- Class hierarchy changed (see design doc) - base classes such
  as wxbWindow now removed.
- No longer includes windows.h in wxWin headers, by using stand-in
  Windows types where needed e.g. WXHWND.
- PrologIO revised.
- wxScrolledWindow, wxStatusBar and new MDI classes added.
  MDI is now achieved using separate classes, not window styles.
- wxSystemSettings added, and made use of to reflect standard
  Windows settings.
- SetButtonFont/SetLabelFont replaced by SetFont; font and colour
  settings mucho rationalised.
- All windows are now subclassed with the same window proc to make
  event handling far more consistent. Old internal wxWnd and derived
  classes removed.
- API for controls revised, in particular addition of
  wxValidator parameters and removal of labels for some controls.
- 1 validator written: see examples/validate.
- Event table system introduced (see most samples and
  wx_event.cpp/ProcessEvent, wx_event.h). wxEvtHandler
  made more flexible, with Push/PopEventHandler allowing a chain
  of event handlers.
- wxRadioBox removed - will be added back soon.
- Toolbar class hierarchy revised:
  wxToolBarBase
  wxToolBarSimple (= old wxToolBar)
  wxToolBar95 (= old wxButtonBar under Win95
  wxToolBarMSW (= old wxButtonBar under WIN16/WIN32)
- Constraint system debugged somewhat (sizers now work properly).
- wxFileDialog, wxDirDialog added; other common dialogs now
  have class equivalents. Generic colour and font dialogs
  rewritten to not need obsolete panel layout.
- .wxr resource system partially reinstated, though needs
  an integer ID for controls. Hopefully the resource system
  will be replaced by something better and more efficient
  in the future.
- Device contexts no longer stored with window and accessed
  with GetDC - use wxClientDC, wxPaintDC, wxWindowDC stack
  variables instead.
- wxSlider uses trackbar class under Win95, and wxSL_LABELS flag
  determines whether labels are shown. Other Win95-specific flags
  introduced, e.g. for showing ticks.
- Styles introduced for dealing with 3D effects per window, for
  any window: all Win95 3D effects supported, plus transparent windows.
- Major change to allow 3D effect support without CTL3D, under
  Win95.
- Bitmap versions of button and checkbox separated out into new
  classes, but unimplemented as yet because I intend to remove
  the need for Fafa - it apparently causes GPFs in Win95 OSR 2.
- utils/wxprop classes working (except maybe wxPropertyFormView)
  in preparation for use in Dialog Editor.
- GNU-WIN32 compilation verified (a month or so ago).