General Information

===================

This is GTK+ version 2.24.32. 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 2.20

======================

* GtkStatusbar now has a message area (see gtk_status_bar_get_message_area)

  which makes it easy to place additional widgets inside the statusbar

  frame or to replace the label widgets. Previously, this was only possible

  by accessing the innards of the statusbar widget directly. Applications

  which are doing so may need some adjustments, since the addition of the

  message area changed the internal widget hierarchy.

* GtkBuilder no longer sets the "name" property of widgets to the ID

  attribute of the <object>. Use gtk_buildable_get_name() instead of

  gtk_widget_get_name() to obtain the ID.

* GTK+ now includes introspection data, as a consequence, it gained a

  dependency on gobject-introspection. It is possible to build without

  introspection by passing --disable-introspection to configure.

Release notes for 2.18

======================

* gtk_tooltip_set_custom now accept a NULL custom_widget to unset the

  old custom_widget. Custom_widget does not get destroyed when the

  tooltip goes away.

* JPEG2000 support is no longer enabled by default. It must be

  explicitly turned on, by passing --with-libjasper to configure.

* GDK has been reworked to implement 'client-side windows'. This offers

  exciting new possibilities, such as transformed, offscreen rendering,

  but it breaks some long-standing assumptions that applications may

  have about GDK windows. Setting the environment variable

  GDK_NATIVE_WINDOWS makes GDK create a native X11 window for each

  GDK window, which might make problematic applications work better.

* GTK+ calls signal (SIGPIPE, SIG_IGN) during initialization, to ignore

  SIGPIPE signals, since these are almost never wanted in graphical

  applications. If you do need to handle SIGPIPE for some reason, reset

  the handler after gtk_init(), but notice that other libraries (e.g.

  libdbus or gvfs) might do similar things.

Release notes for 2.16

======================

* Password entries now display a caps-lock warning. This can be turned off

  with the caps-lock-warning property.

* Various orientation-related functions have been deprecated in favour

  of the new GtkOrientable interface: gtk_scale_button_get_orientation,

  gtk_scale_button_set_orientation, gtk_toolbar_set_orientation.

* The action-proxy interaction has been changed. Widgets that operate as

  proxies have to implement the GtkActivatable interface now. GtkActivatable

  implementation are responsible for syncing their appearance with the

  action and for activating the action. All GTK+ widgets that are commonly

  used as proxies implement the GtkActivatable interface.

* The handling of keyboard shortcuts has been changed, to help with a

  longstanding complaint about the way GTK+ handles multiple layouts. GTK+

  now only uses keys from groups other than the current group if they are

  not present in the current group.

Release notes for 2.14

======================

* gtkitemfactory.h is now completely deprecated.

  As gtkactiongroup.h and gtkstock.h no longer include the gtkitemfactory.h

  header, this might break application using gtk_item_factory_* symbols

  without including gtkitemfactory.h - even though this behaviour has never

  been supported in the first place.

* The GtkFileSystem semi-private interface has been removed.

  The GTK+ filechooser implementation now uses GIO directly, which has

  rendered external filesystem implementations unnecessary. Consequently,

  the GtkFileSystem interface is no longer available, nor the filechooser

  will load any GtkFileSystem implementation.

* GtkComboBox now renders the popdown button insensitive when

  the model is empty. Applications which want to populate the list

  only before displaying it can set gtk_combo_box_set_button_sensitivity

  to GTK_SENSITIVITY_ON, so that the button is always sensitive or

  GTK_SENSITIVITY_OFF to make it insensitive respectively.

* In the early 2.14.x releases, GtkAdjustment was changed to enforce

  that values are restricted to the range [lower, upper - page_size].

  This has always been the documented behaviour, and the recommended

  practice is to set page_size to 0 when using adjustments for simple

  scalar values, like in a slider or spin button.

  Due to the large number of applications that are affected by this

  change, the behaviour has been reverted to the old behaviour in

  2.14.3, with an explicit warning that this change will be

  reintroduced in 2.90.

* gdk-pixbuf will use GIO for mime type detection if possible. For

  this to work, shared-mime-info needs to be installed and XDG_DATA_DIRS

  set accordingly at configure time. Otherwise, gdk-pixbuf falls

  back to its built-in sniffing implementation.

Release notes for 2.12

======================

* gtk_about_dialog_get/set_name() were deprecated in favour of

  gtk_about_dialog_get/set_program_name(), the GtkAboutDialog now uses the

  "program-name" property instead of the conflicting "name" property.

* The gdk-pixbuf tiff loader now requires libtiff 3.6.0 or later.

* Support for Windows 9x/ME has officially been removed. It hasn't worked

  since 2.6 anyway.

* The GtkTextBufferTargetInfo enumeration values have been changed from

  G_MAXUINT-0, G_MAXUINT-1, G_MAXUINT-2, etc, to -1, -2, -3 to stay within

  ANSI C limits.

* A change in the handling of _NET_WM_USER_TIME properties on toplevel

  windows can cause deadlock problems with window managers that are using

  GDK for drawing decorations. In particular, metacity <= 2.18.0 is affected

  by this. The problem has been fixed in metacity 2.18.1.

* Semi-private GtkTextLayout api has changed: new GtkTextLayout method

  invalidate_cursors(), and new functions gtk_text_layout_invalidate_cursors()

  and gtk_text_layout_cursors_changed(), which should be used in place of

  gtk_text_layout_invalidate() and gtk_text_layout_changed() if invalidation

  is due to marks moved or changed selection; new GtkTextLineDisplay structure

  member. Source compatibility is preserved; binary compatibility may break

  only if GtkTextLineDisplay structure was created on stack or as a part

  of another structure (in particular GnomeCanvas and its clones do not need

  recompiling).

* Another new signal has been added to GtkNotebook. The new signal

  is called create-window, so this name can no longer be used for signals

  in objects derived from GtkNotebook.

* The gtk_notebook_set/get_group_id() functions were found to be insufficient

  and have been deprecated in favour of gtk_notebook_set/get_group().

* The move-focus signal has been moved to GtkWidget, to unify the 

  various implementations of this signal in specific widgets. Great care 

  has been taken to make sure that all code using this signal continues

  to work.

* An unused and hardly visible GtkFrame has been removed from the menu 

  widget hierarchy when GtkComboBox::appears-as-list style property is 

  set. Any RC file applying a different style to any widget below the 

  widget path "gtk-combobox-popup-window.GtkFrame" should take into 

  account that the frame no longer exists.

* The external print preview application used by GtkPrintOperationPreview 

  is now passed the print settings on the command line with the 

  --print-settings parameter pointing to a temp file containing the 

  settings. The preview application assumes ownership of the file and 

  should delete it once it does not need it anymore. The --print-settings 

  commandline option is understood by Evince 0.9.0 and newer. To use a 

  different print preview application, change the gtk-print-preview-command 

  setting in your gtkrc file, e.g. gtk-print-preview-command = "ggv %f"

* GtkMenuShell is now defined as an abstract type. It was already 

  documented as an abstract class, and there is little reason to 

  instantiate it.

* The GtkTooltips struct (this is the old tooltips API) is now considered

  private. Code that used to access this struct, in particular the

  tips_data_list field, will need to change. All of the old tooltips

  API has been deprecated in favour of a new implementation and

  API. This affects all of the gtk_tooltips_ functions, and functions 

  which take a GtkTooltips argument, such as gtk_tool_item_set_tooltip()

  and gtk_menu_tool_button_set_arrow_tooltip().

* The memory management of the GtkRecentManager object has been changed,

  as using the screen didn't guarantee that the singleton instance was

  correctly destroyed. The screen-related functions have been deprecated,

  and should not be used anymore; the GtkRecentManager instance returned by

  the gtk_recent_manager_get_default() function is guaranteed to be valid

  for the entire lifetime of an application.

* A number of interfaces that have been superseded by newer interfaces for 

  a long time have finally been deprecated. This includes 

  gtk_widget_ref/unref(), gtk_rc_style_ref/unref() and the old file selector.

* The various coordinate systems in use in GtkTreeView widgets have

  been clarified in the documentation, and in the cause of doing so, 

  the functions gtk_tree_view_widget_to_tree_coords() and

  gtk_tree_view_tree_to_widget_coords() have been deprecated in 

  favour of a new family of gtk_tree_view_convert_ functions.

* gtk_menu_item_remove_submenu() has been deprecated in favour of

  gtk_menu_item_set_submenu (..., NULL).

* gtk_default_draw_check() has been fixed to really decrease the

  indicator size by one pixel to ensure an odd size instead of

  accidentially increasing it.

  Consequently, gtk_cell_renderer_toggle_render() could be fixed to

  not subtract 1 from the size passed to gtk_paint_option(), which

  was just a workaround for above off-by-two for even sizes (theme

  engines now get the real indicator size passed).

  The default toggle size of GtkCheckMenuItem and GtkCellRendererToggle

  has been changed to 13 to be consistent with GtkCheckButton.

  The only visible change with default settings is that the indicator in

  GtkCellRendererToggle has changed its size from 11 to 13 and is now

  consistent with menus and toggle buttons.

* GTK+ has always required that gtk_init() (or a variant thereof) is

  called before any other GTK+ function. Some applications call functions

  like gtk_clipboard_get() to check if they need to call gtk_init(),

  anyway. A change in GLib 2.14 has recently broken this unsupported

  practise. It is worth pointing out that calling gtk_init() twice

  does no harm.

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.

Patches should be in unified diff form. (The -up option to GNU diff.)