path: root/README

General Information
===================

This is GTK+ version 2.10.2. GTK+ is a multi-platform toolkit for
creating graphical user interfaces. Offering a complete set of widgets,
GTK+ is suitable for projects ranging from small one-off projects to
complete application suites.

GTK+ is free software and part of the GNU Project. However, the
licensing terms for GTK+, the GNU LGPL, allow it to be used by all
developers, including those developing proprietary software, without any
license fees or royalties.

The official ftp site is:
  ftp://ftp.gtk.org/pub/gtk

The official web site is:
  http://www.gtk.org/

Information about mailing lists can be found at
  http://www.gtk.org/mailinglists.html


Installation
============

See the file 'INSTALL'


Release notes for 2.10
======================

* The hexadecimal Unicode input feature has been reworked. It no longer
  blocks the use of the sixteen Ctrl-Shift-<hex digit> key sequences. Now
  it only uses Ctrl-Shift-u.

* A memory leak in GtkStyle handling has been fixed. This may expose bugs
  in third-party widgets which forget to call gtk_style_attach() in their
  realize functions.

* Range widgets like GtkScrollbar now render their arrows insensitive
  when the slider is at the end. Applications which react to arrow
  clicks even if the slider is at the end may want to use the new
  gtk_range_set_[upper/lower]_stepper_sensitivity() functions to
  prevent the arrows from being rendered insensitive.

* GtkObject now uses the "floating reference" support in GObject. 
  GTK_OBJECT_IS_FLOATING() will still work, but direct checking
  of the GTK_FLOATING flag will no longer detect the floating 
  reference. Details about floating references can be found in the docs:
  http://developer.gnome.org/doc/API/2.0/gobject/gobject-The-Base-Object-Type.html#floating-ref

* Accelerators like (_F) are now stripped from labels when they are 
  displayed in toolbars. If this is not wanted, the feature can be 
  suppressed by inserting a Unicode control character, e.g ZWNJ.

* The pixbuf theme engine can now customize expanders (in GtkTreeView
  and GtkExpander) and resize grips, using the new EXPANDER and
  RESIZE_GRIP function values.

* Dialogs created by gtk_about_dialog_new() no longer hide automatically
  when the user clicks close. It is the applications responsibility to
  hide or destroy the dialog.

* Several new signals have been added to GtkNotebook. Care has been taken
  to choose signal names which do not collide with signals added by well-known
  derived classes. The names which can no longer be used for signals in 
  objects derived from GtkNotebook are page-reordered, page-removed and
  page-added.

* Due to the interface changes in the file chooser backend interface, 
  the GTK+ ABI version has been bumped to 2.10.0. Third-party filesystem 
  backends have to be ported to the new interface, other modules, such as 
  theme engines, input method modules or pixbuf loaders have to be rebuilt 
  so that they are installed in the right place for GTK+ to find them.


Release notes for 2.8
=====================

* GTK+ 2.8 and Pango 1.10 require the cairo library.

* The default theme has been renamed to "Raleigh". Existing configurations
  specifying the "Default" theme name should still work.

* The GtkTreeView::enable-search property has been changed to control
  only typeahead search, not the C-f keybinding to start an interactive
  search. To turn off interactive searching completely, you have to
  set GtkTreeView::search-column to -1.

* The restriction on using the same cell renderer in multiple columns
  of a GtkTreeView is now more strictly enforced.

* In GTK+ 2.8, GtkCalendar uses nl_langinfo() (if available) to determine
  the first day of the week. Thus, it is possible to select the first day
  of the week independently from the language, by setting LC_TIME.

* In GTK+ 2.8, the gtk-update-icon-cache utility includes image data
  in the icon caches, which will make the icon cache files larger than
  the one produced by GTK+ 2.6. This change will reduce the memory
  overhead of icon themes at runtime, since all GTK+ applications can
  share the image data in memory.

* In 2.8, GDK emits GdkEventGrabBroken events when a keyboard or pointer
  grab is broken. On X11, this can happen if the same application grabs
  again, or if the window used for the grab becomes unviewable. It happens
  more often on Win32. Applications which use grabs should pay attention
  to these events and do the necessary cleanups when the grab is lost.
* The GIOChannel code for sockets on win32 has been rewritten.
  Applications who make non-trivial use of GIOChannels on win32 should
  be watched for possible problems.

* GLib 2.8 uses atomic operations to implement reference counting, thus
  g_object_ref/unref, g_closure_ref/sink/unref and g_iochannel_ref/unref
  can be used without locking in multithreaded applications. Note that
  other modifications, like concurrent setting of properties still require
  locking.

* g_convert() and related character set conversion functions have been
  fixed to emit pending shift states and to not cache iconv descriptors
  across multiple calls, since that is problematic for some encodings.
  Note that these functions are not suitable for streaming conversions;
  use g_iconv() to do streaming conversion.


Release notes for 2.6
=====================

* GTK+ 2.6 supports clipboard persistency. To make use of this feature,
  a clipboard manager following the specification at
  http://www.freedesktop.org/wiki/Standards/clipboard-manager-spec
  must be running. A sample implementation of such a clipboard manager
  is available at 
  http://people.imendio.com/andersca/archives/clipboard-manager-0.3.tar.gz
  Applications can use the function gdk_display_supports_clipboard_persistence() 
  to find out if clipboard persistence is available.

* Notification on clipboard ownership changes via GdkOwnerChange events 
  requires the XFIXES X extension. Applications can use the function
  gdk_display_supports_selection_notification() to find out if ownerchip
  change notification is available.

* The icon theme code in GTK+ 2.6 follows the freedesktop.org icon theme 
  specification. Setting the XDG_DATA_DIRS environtment variable may be 
  necessary if your icons aren't installed in the default location 
  /usr/share/icons.

* The icon theme code in GTK+ 2.6 can make use of mmap()able cache files
  to avoid a lot of disk searching overhead. GTK+ includes a utility named
  gtk-update-icon-cache to generate these cache files. For further details,
  see the gtk-update-icon-cache man page or the GTK+ documentation.

* To reduce code size and improve efficiency, GTK+, when compiled 
  with the GNU toolchain, has separate internal and external entry 
  points for exported functions. The internal names, which begin with 
  IA__, may be seen when debugging a GTK+ program.

* The following functions have been deprecated in GTK+ 2.6:
  gdk_pango_context_set_colormap
  gtk_cell_renderer_editing_canceled

* The new GtkFileChooser widget emphasizes simplicity and thus does 
  not provide a navigation entry by default when opening files. 
  Experienced command line users will likely want to make heavy use of
  the location dialog brought up by the Control-L key shortcut.

* The GTK+ libraries use an '_' prefix to indicate private symbols that
  must not be used by applications. On some platforms, symbols beginning 
  with prefixes such as _gtk, _gdk, and _pango will be exported
  from the library, on others not. In no case can applications
  use these private symbols. In addition to that, GTK+ 2.6 makes several
  symbols private which were not in any installed header files and
  were never intended to be exported.

* The gdk_pixbuf_xlib library included in the contrib/ directory 
  and the framebuffer GDK backend included in the gdk/linux-fb directory
  of GTK+ are provided on an as-is basis and have not been tested at all. 
  No guarantees about the degree of workingness or about future
  compatibility are provided.

* On Unix, the assumption of GLib and GTK+ by default is that filenames on 
  the filesystem are encoded in UTF-8 rather than the encoding of the locale;
  the GTK+ developers consider that having filenames whose interpretation
  depends on the current locale is fundamentally a bad idea.

  If you have filenames encoded in the encoding of your locale, then you 
  may want to set the G_FILENAME_ENCODING environment variable:
  
   G_FILENAME_ENCODING=@locale
   export G_FILENAME_ENCODING

  (Earlier versions of GLib 2.x required a different environment variable
  setting; G_BROKEN_FILENAMES=1 to achieve the same effect; this 
  is still supported, but G_FILENAME_ENCODING is preferred.)
  Best integration of GTK+ 2.6 with the environment is achieved by 
  using a UTF-8 locale.

  On Windows, filenames passed to GTK+ should always be in UTF-8, as
  in GLib 2.6. This is different than in previous versions of GTK+
  where the system codepage was used. As in GLib, for DLL ABI
  stability, applications built against previous versions of GTK+ will
  use entry points providing the old semantics.

  When compiling against GTK+ 2.6, applications intended to be
  portable to Windows must take the UTF-8 file name encoding into
  consideration, and use the gstdio wrappers to access files whose 
  names have been constructed from strings returned from GTK+ or GLib.


How to report bugs
==================

Bugs should be reported to the GNOME bug tracking system.
(http://bugzilla.gnome.org, product gtk+.) You will need to create an
account for yourself.
  
In the bug report please include:
  
* Information about your system. For instance:

   - What operating system and version
   - What version of X
   - For Linux, what version of the C library

  And anything else you think is relevant.

* How to reproduce the bug. 

  If you can reproduce it with one of the tests or demos built with GTK+, 
  such as demos/gtk-demo/gtk-demo, that would be most convenient. Otherwise, 
  please include a short test program that exhibits the behavior. As a 
  last resort, you can also provide a pointer to a larger piece of software 
  that can be downloaded.

* If the bug was a crash, the exact text that was printed out when the
  crash occured.

* Further information such as stack traces may be useful, but is not
  necessary. If you do send a stack trace, and the error is an X error,
  it will be more useful if the stacktrace is produced running the test
  program with the --sync command line option.


Patches
=======

Patches should also be submitted to bugzilla.gnome.org. If the patch
fixes an existing bug, add the patch as an attachment to that bug
report.

Otherwise, enter a new bug report that describes the patch, and attach
the patch to that bug report.

Bug reports containing patches should include the PATCH keyword in their
keyword fields. If the patch adds to or changes the GTK+ programming
interface, the API keyword should also be included.
  
Patches should be in unified diff form. (The -u option to GNU diff.)