gtk/docs/Changes-2.0.txt
Havoc Pennington 56a2f2c628 Remove draw_focus and draw_default (gtk_widget_draw_focus): remove this
2001-02-28  Havoc Pennington  <hp@redhat.com>

	* gtk/gtkwidget.h (struct _GtkWidgetClass): Remove draw_focus and
	draw_default
	(gtk_widget_draw_focus): remove this function; we could instead
	make it just gtk_widget_draw(), but in most cases I think the
	result would be broken user code, so think it's better to have
	that code not compile and get fixed
	(gtk_widget_draw_default): ditto

	* gtk/gtkwidget.c: Add default handlers for focus_in_event and
	focus_out_event that set/unset GTK_HAS_FOCUS and call queue_draw

	* gtk/gtkwindow.c (gtk_window_set_default): just queue a draw when
	widgets lose/get the default, instead of calling draw_default

	* docs/Changes-2.0.txt: note about all this

	Then fixed every widget in GTK, I won't list all the filenames.
2001-02-28 19:07:46 +00:00

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Incompatible Changes from GTK+-1.2 to GTK+-2.0:
* gtk_container_get_toplevels() was removed and replaced with
gtk_window_list_toplevels(), which has different memory management
on the return value (gtk_window_list_toplevels() copies the GList
and also references each widget in the list, so you have to
g_list_free() the list after first unref'ing each list member).
* The gdk_time* functions have been removed. This functionality
has been unused since the main loop was moved into GLib
prior to 1.2.
* The signature for GtkPrintFunc (used for gtk_item_factory_dump_items)
has been changed to take a 'const gchar *' instead of 'gchar *', to
match what we do for glib, and other similar cases.
* The detail arguments in the GtkStyleClass structure are now 'const gchar *'.
* gtk_paned_set_gutter_size() has been removed, since the small handle tab
has been changed to include the entire area previously occupied by
the gutter.
* GDK no longer selects OwnerGrabButtonMask for button presses. This means
that the automatic grab that occurs when the user presses a button
will have owner_events = FALSE, so all events are redirected to the
grab window, even events that would normally go to other windows of the
window's owner.
* GtkColorSelectionDialog has now been moved into it's own set of files,
gtkcolorseldialog.c and gtkcolorseldialog.h.
* gtk_widget_shape_combine_mask() now keeps a reference count on the
mask pixmap that is passed in.
* Type system changes:
- GTK_TYPE_OBJECT is not a fundamental type anymore. Type checks of the
style (GTK_FUNDAMENTAL_TYPE (some_type) == GTK_TYPE_OBJECT)
will not work anymore. As a replacement, (GTK_TYPE_IS_OBJECT (some_type))
can be used now.
- The following types vanished: GTK_TYPE_ARGS, GTK_TYPE_CALLBACK,
GTK_TYPE_C_CALLBACK, GTK_TYPE_FOREIGN. The corresponding GtkArg
fields and field access macros are also gone.
- The following type aliases vanished: GTK_TYPE_FLAT_FIRST,
GTK_TYPE_FLAT_LAST, GTK_TYPE_STRUCTURED_FIRST, GTK_TYPE_STRUCTURED_LAST.
- The type macros GTK_TYPE_MAKE() and GTK_TYPE_SEQNO() vanished, use of
GTK_FUNDAMENTAL_TYPE() is discouraged. Instead, the corresponding GType
API should be used: G_TYPE_FUNDAMENTAL(), G_TYPE_DERIVE_ID(),
G_TYPE_BRANCH_SEQNO(). Note that the GLib type system doesn't build new
type ids based on a global incremental sequential number anymore, but
numbers new type ids sequentially per fundamental type branch.
- The following type functions vanished/were replaced:
Old Function Replacement
gtk_type_query() - being investigated -
gtk_type_set_varargs_type() -
gtk_type_get_varargs_type() -
gtk_type_check_object_cast() g_type_check_instance_cast()
gtk_type_check_class_cast() g_type_check_class_cast()
gtk_type_describe_tree() -
gtk_type_describe_heritage() -
gtk_type_free() -
gtk_type_children_types() g_type_children()
gtk_type_set_chunk_alloc() GTypeInfo.n_preallocs
gtk_type_register_enum() g_enum_register_static()
gtk_type_register_flags() g_flags_register_static()
gtk_type_parent_class() g_type_parent() / g_type_class_peek_parent()
Use of g_type_class_ref() / g_type_class_unref() and g_type_class_peek()
is recommended over usage of gtk_type_class().
Use of g_type_register_static() / g_type_register_dynamic() is recommended
over usage of gtk_type_unique().
* Object system changes:
GtkObject derives from GObject, so is not the basic object type anymore.
This imposes the following source incompatible changes:
- GtkObject has no klass field anymore, an object's class can be retrived
with the object's coresponding GTK_<OBJECT>_GET_CLASS (object) macro.
- GtkObjectClass has no type field anymore, a class's type can be retrived
with the GTK_CLASS_TYPE (class) macro.
- GtkObjectClass does not introduce the finalize() and shutdown() methods
anymore. While shutdown() is intended for GTK+ internal use only, finalize()
is required by a variety of object implementations. GObjectClass.finalize
should be overriden here, e.g.:
static void gtk_label_finalize (GObject *gobject)
{
GtkLabel *label = GTK_LABEL (gobject);
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static void gtk_label_class_init (GtkLabelClass *class)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (class);
gobject_class->finalize = gtk_label_finalize;
}
- the GtkObject::destroy signal can now be emitted multiple times on an object.
::destroy implementations should check that make sure that they take this
into account, by checking to make sure that resources are there before
freeing them. For example:
if (object->foo_data)
{
g_free (object->foo_data);
object->foo_data = NULL;
}
Also, ::destroy implementations have to release object references that
the object holds. Code in finalize implementations such as:
if (object->adjustment)
{
gtk_object_unref (object->adjustment);
object->adjustment = NULL;
}
have to be moved into the ::destroy implementations. The reason for doing
this is that all object reference cycles should be broken at destruction
time.
* Signal system changes:
The Gtk 2.0 signal merly proxies the GSignal system now.
For future usage, direct use of the GSignal API is recommended,
this avoids significant performance hits where GtkArg structures
have to be converted into GValues. For language bindings,
GSignal+GClosure provide a much more flexible and convenient
mechanism to hook into signal emissions or install class default
handlers, so the old GtkSignal API for language bindings is not
supported anymore.
Functions that got removed in the Gtk signal API:
gtk_signal_n_emissions(), gtk_signal_n_emissions_by_name(),
gtk_signal_set_funcs(), gtk_signal_handler_pending_by_id(),
gtk_signal_add_emission_hook(), gtk_signal_add_emission_hook_full(),
gtk_signal_remove_emission_hook(), gtk_signal_query().
gtk_signal_add_emission_hook(), gtk_signal_remove_emission_hook().
Also, the GtkCallbackMarshal argument to gtk_signal_connect_full() is
not supported anymore.
For many of the removed functions, similar variants are available
in the g_signal_* namespace.
- Inserting and deleting text in GtkEntry though functions such
as gtk_entry_insert_text() now leave the cursor at its original
position in the text instead of moving it to the location of
the insertion/deletion.
- The ->label field of GtkFrame widgets has been removed. (As part of
a change to allow the arbitrary widgets in the title position.) The
text can now be retrieved with the new function gtk_frame_get_text().
- The 'font' and 'font_set' declarations in RC files are now ignored. There
is a new 'font_name' field that holds the string form of a Pango font
- A number of types in GDK have become subclasses of GObject. For the
most part, this should not break anyone's code. However, it's now
possible/encouraged to use g_object_ref()/g_object_unref() and other
GObject features with these GDK types. The converted types are:
GdkWindow, GdkDrawable, GdkPixmap, GdkImage, GdkGC, GdkDragContext,
GdkColormap
- All drawables including pixmaps used to have a type tag, the
GdkWindowType enumeration, which included GDK_WINDOW_PIXMAP.
GdkWindowType is now a property of GdkWindow _only_, and there is
no GDK_WINDOW_PIXMAP. You can use the GDK_IS_PIXMAP() macro to see
if you have a pixmap, if you need to know that.
- GtkStyle and GtkRcStyle are now subclasses of GObject as well. This
requires fairly extensive changes to theme engines quite badly, but
shouldn't affect most other code.
- xthickness/ythickness have moved from GtkStyleClass to GtkStyle
(from class to instance). This gives themes a bit more flexibility
and is generally more of the Right Thing. You can trivially fix
your code with s/style->klass->xthickness/style->xthickness/g and
same for ythickness.
- Some GtkStyle draw_ methods have been removed (cross, oval, ramp)
and others have been added (expander, layout). This will require
changes to theme engines.
- If you were using private GDK types, they have been rearranged
significantly. You shouldn't use private types. ;-)
- The visual for a widget, and also the default visual is now derived
from the colormap for the widget and the default colormap.
gtk_widget_set_visual(), gtk_widget_set_default_visual(), gtk_widget_push_visual()
and gtk_widget_pop_visual() now do nothing. Since the visual always
had to match that of the colormap, it is safe to simply delete
all references to these functions.
- A number of functions in GDK have been renamed for consistency and
clarity. #defines to provide backwards compatibility have been
included, but can be disabled by defineing GDK_DISABLE_COMPAT_H.
#define gdk_draw_pixmap gdk_draw_drawable
#define gdk_draw_bitmap gdk_draw_drawable
#define gdk_window_get_size gdk_drawable_get_size
#define gdk_window_get_type gdk_window_get_window_type
#define gdk_window_get_colormap gdk_drawable_get_colormap
#define gdk_window_set_colormap gdk_drawable_set_colormap
#define gdk_window_get_visual gdk_drawable_get_visual
#define gdk_window_ref gdk_drawable_ref
#define gdk_window_unref gdk_drawable_unref
#define gdk_bitmap_ref gdk_drawable_ref
#define gdk_bitmap_unref gdk_drawable_unref
#define gdk_pixmap_ref gdk_drawable_ref
#define gdk_pixmap_unref gdk_drawable_unref
#define gdk_gc_destroy gdk_gc_unref
#define gdk_image_destroy gdk_image_unref
#define gdk_cursor_destroy gdk_cursor_unref
(Note that g_object_ref() and g_object_unref() may be used for all of
the above.)
#define gdk_window_copy_area(drawable,gc,x,y,source_drawable,source_x,source_y,width,height) \
gdk_draw_pixmap(drawable,gc,source_drawable,source_x,source_y,x,y,width,height)
#define gdk_rgb_get_cmap gdk_rgb_get_colormap
- gdk_pixmap_foreign_new() no longer calls XFreePixmap() on the
pixmap when the GdkPixmap is finalized. This change corresponds
to the behavior of gdk_window_foreign_new(), and fixes a lot
of problems with code where the pixmap wasn't supposed to be
freed. If XFreePixmap() is needed, it can be done using the
destroy-notification facilities of g_object_set_data().
- GtkProgress/GtkProgressBar had serious problems in GTK 1.2.
- Only 3 or 4 functions are really needed for 95% of progress
interfaces; GtkProgress[Bar] had about 25 functions, and
didn't even include these 3 or 4.
- In activity mode, the API involves setting the adjustment
to any random value, just to have the side effect of
calling the progress bar update function - the adjustment
is totally ignored in activity mode
- You set the activity step as a pixel value, which means to
set the activity step you basically need to connect to
size_allocate
- There are ctree_set_expander_style()-functions, to randomly
change look-and-feel for no good reason
- The split between GtkProgress and GtkProgressBar makes no sense
to me whatsoever.
This was a big wart on GTK and made people waste lots of time,
both learning and using the interface.
So, we have added what we feel is the correct API, and marked all the
rest deprecated. However, the changes are 100% backward-compatible and
should break no existing code.
The following 5 functions are the new programming interface and you
should consider changing your code to use them:
void gtk_progress_bar_pulse (GtkProgressBar *pbar);
void gtk_progress_bar_set_text (GtkProgressBar *pbar,
const gchar *text);
void gtk_progress_bar_set_fraction (GtkProgressBar *pbar,
gfloat fraction);
void gtk_progress_bar_set_pulse_step (GtkProgressBar *pbar,
gfloat fraction);
void gtk_progress_bar_set_orientation (GtkProgressBar *pbar,
GtkProgressBarOrientation orientation);
* The GtkNotebookPage structure has been removed from the public header files;
this was never meant to be a public structure, and all functionality that
could be done by accessing the struct fields of this structure should be
accesible otherwise.
- GtkMenuPositionFunc has a new parameter push_in which controls how
menus placed outside the screen is handled. If this is set to true and
part of the menu is outside the screen then Gtk+ pushes it into the visible
area. Otherwise the menu is cut of at the end of the visible screen area.
Regardles of what happens to the size of the menu, the result is always
that the items are placed in the same place as if the menu was placed
outside the screen, using menu scrolling if necessary.
- The "draw" signal and virtual method on GtkWidget has been removed.
All drawing should now occur by invalidating a region of the widget
(call gdk_window_invalidate_rect() or gtk_widget_queue_draw() for
example to invalidate a region). GTK+ merges all invalid regions,
and sends expose events to the widget in an idle handler for the
invalid regions. gtk_widget_draw() is deprecated but still works; it
adds the passed-in area to the invalid region and immediately sends
expose events for the current invalid region.
Most widgets will work fine if you just delete their "draw"
implementation, since they will already have working expose_event
implementations. The draw method was rarely called in practice
anyway.
- GtkText and GtkTree are buggy and broken. We don't recommend using
them, and changing old code to avoid them is a good idea. The
recommended alternatives are GtkTextView and GtkTreeView. The
broken widgets are not declared in the headers by default; to use
them, define the symbol GTK_ENABLE_BROKEN during compilation. In
some future release, these widgets will be removed from GTK+.
- GdkColorContext is gone; you probably weren't using it anyway.
Use GdkColormap and the gdk_rgb_* functions instead.
- The draw_default and draw_focus methods/signals on GtkWidget are
gone; simply draw things in your expose handler.
gtk_widget_draw_focus() and gtk_widget_draw_default() wrapper
functions are also gone; just queue a draw on the widget,
or the part affected by the focus/default anyway.
Also, GtkWidget now has default implementations for focus_in_event
and focus_out_event. These set/unset GTK_HAS_FOCUS, and queue a
draw. So if your focus in/out handler just does that, you can delete
it.