Sets our main struct and passes it to the parent class
Declares a callback_symbol to handle callback_name from the template XML defined for widget_type. See gtk_builder_add_callback_symbol(). Note This must be called from a composite widget classes class initializer after calling gtk_widget_class_set_template()
Automatically assign an object declared in the class template XML to be set to a location on a freshly built instance's private data, or alternatively accessible via gtk_widget_get_automated_child(). The struct can point either into the public instance, then you should use G_STRUCT_OFFSET(WidgetType, member) for struct_offset, or in the private struct, then you should use G_PRIVATE_OFFSET(WidgetType, member). An explicit strong reference will be held automatically for the duration of your instance's life cycle, it will be released automatically when GObjectClass.dispose() runs on your instance and if a struct_offset that is >= 0 is specified, then the automatic location in your instance private data will be set to NULL. You can however access an automated child pointer the first time your classes GObjectClass.dispose() runs, or alternatively in GtkWidgetClass.destroy(). If internal_child is specified, GtkBuildableIface.get_internal_child() will be automatically implemented by the GtkWidget class so there is no need to implement it manually. The wrapper macros gtk_widget_class_bind_template_child(), gtk_widget_class_bind_template_child_internal(), gtk_widget_class_bind_template_child_private() and gtk_widget_class_bind_private_template_child_internal() might be more convenient to use. Note This must be called from a composite widget classes class initializer after calling gtk_widget_class_set_template()
Finds a style property of a widget class by name. Since 2.2
the main Gtk struct as a void*
Installs a style property on a widget class. The parser for the style property is determined by the value type of pspec.
Installs a style property on a widget class.
Returns all style properties of a widget class. Since 2.2
Sets the default AtkRole to be set on accessibles created for widgets of widget_class. Accessibles may decide to not honor this setting if their role reporting is more refined. Calls to gtk_widget_class_set_accessible_type() will reset this value. In cases where you want more fine-grained control over the role of accessibles created for widget_class, you should provide your own accessible type and use gtk_widget_class_set_accessible_type() instead. If role is ATK_ROLE_INVALID, the default role will not be changed and the accessible's default role will be used instead. This function should only be called from class init functions of widgets.
Sets the type to be used for creating accessibles for widgets of widget_class. The given type must be a subtype of the type used for accessibles of the parent class. This function should only be called from class init functions of widgets.
For use in lanuage bindings, this will override the default GtkBuilderConnectFunc to be used when parsing GtkBuilder xml from this class's template data. Note This must be called from a composite widget classes class initializer after calling gtk_widget_class_set_template()
This should be called at class initialization time to specify the GtkBuilder XML to be used to extend a widget. For convenience, gtk_widget_class_set_template_from_resource() is also provided. Note Any class that installs templates must call gtk_widget_init_template() in the widget's instance initializer
A convenience function to call gtk_widget_class_set_template(). Note Any class that installs templates must call gtk_widget_init_template() in the widget's instance initializer
Warning gtk_widget_class_path has been deprecated since version 3.0 and should not be used in newly-written code. Use gtk_widget_get_path() instead Same as gtk_widget_path(), but always uses the name of a widget's type, never uses a custom name set with gtk_widget_set_name().
the main Gtk struct
GtkWidget is the base class all widgets in GTK+ derive from. It manages the widget lifecycle, states and style.
Height-for-width Geometry Management
GTK+ uses a height-for-width (and width-for-height) geometry management system. Height-for-width means that a widget can change how much vertical space it needs, depending on the amount of horizontal space that it is given (and similar for width-for-height). The most common example is a label that reflows to fill up the available width, wraps to fewer lines, and therefore needs less height.
Height-for-width geometry management is implemented in GTK+ by way of five virtual methods:
GtkWidgetClass.get_request_mode() GtkWidgetClass.get_preferred_width() GtkWidgetClass.get_preferred_height() GtkWidgetClass.get_preferred_height_for_width() GtkWidgetClass.get_preferred_width_for_height() GtkWidgetClass.get_preferred_height_and_baseline_for_width()
There are some important things to keep in mind when implementing height-for-width and when using it in container implementations.
The geometry management system will query a widget hierarchy in only one orientation at a time. When widgets are initially queried for their minimum sizes it is generally done in two initial passes in the GtkSizeRequestMode chosen by the toplevel.
For example, when queried in the normal GTK_SIZE_REQUEST_HEIGHT_FOR_WIDTH mode: First, the default minimum and natural width for each widget in the interface will be computed using gtk_widget_get_preferred_width(). Because the preferred widths for each container depend on the preferred widths of their children, this information propagates up the hierarchy, and finally a minimum and natural width is determined for the entire toplevel. Next, the toplevel will use the minimum width to query for the minimum height contextual to that width using gtk_widget_get_preferred_height_for_width(), which will also be a highly recursive operation. The minimum height for the minimum width is normally used to set the minimum size constraint on the toplevel (unless gtk_window_set_geometry_hints() is explicitly used instead).
After the toplevel window has initially requested its size in both dimensions it can go on to allocate itself a reasonable size (or a size previously specified with gtk_window_set_default_size()). During the recursive allocation process it's important to note that request cycles will be recursively executed while container widgets allocate their children. Each container widget, once allocated a size, will go on to first share the space in one orientation among its children and then request each child's height for its target allocated width or its width for allocated height, depending. In this way a GtkWidget will typically be requested its size a number of times before actually being allocated a size. The size a widget is finally allocated can of course differ from the size it has requested. For this reason, GtkWidget caches a small number of results to avoid re-querying for the same sizes in one allocation cycle.
See GtkContainer's geometry management section to learn more about how height-for-width allocations are performed by container widgets.
If a widget does move content around to intelligently use up the allocated size then it must support the request in both GtkSizeRequestModes even if the widget in question only trades sizes in a single orientation.
For instance, a GtkLabel that does height-for-width word wrapping will not expect to have GtkWidgetClass.get_preferred_height() called because that call is specific to a width-for-height request. In this case the label must return the height required for its own minimum possible width. By following this rule any widget that handles height-for-width or width-for-height requests will always be allocated at least enough space to fit its own content.
Here are some examples of how a GTK_SIZE_REQUEST_HEIGHT_FOR_WIDTH widget generally deals with width-for-height requests, for GtkWidgetClass.get_preferred_height() it will do:
static void foo_widget_get_preferred_height (GtkWidget *widget, gint *min_height, gint *nat_height) { * if (i_am_in_height_for_width_mode) * { * gint min_width; * * GTK_WIDGET_GET_CLASS (widget)->get_preferred_width (widget, min_width, NULL); * GTK_WIDGET_GET_CLASS (widget)->get_preferred_height_for_width (widget, min_width, * min_height, nat_height); * } * else * { * ... some widgets do both. For instance, if a GtkLabel is rotated to 90 degrees * it will return the minimum and natural height for the rotated label here. * } }
And in GtkWidgetClass.get_preferred_width_for_height() it will simply return the minimum and natural width:
static void foo_widget_get_preferred_width_for_height (GtkWidget *widget, gint for_height, gint *min_width, gint *nat_width) { * if (i_am_in_height_for_width_mode) * { * GTK_WIDGET_GET_CLASS (widget)->get_preferred_width (widget, min_width, nat_width); * } * else * { * ... again if a widget is sometimes operating in width-for-height mode * (like a rotated GtkLabel) it can go ahead and do its real width for * height calculation here. * } }
Often a widget needs to get its own request during size request or allocation. For example, when computing height it may need to also compute width. Or when deciding how to use an allocation, the widget may need to know its natural size. In these cases, the widget should be careful to call its virtual methods directly, like this:
It will not work to use the wrapper functions, such as gtk_widget_get_preferred_width() inside your own size request implementation. These return a request adjusted by GtkSizeGroup and by the GtkWidgetClass.adjust_size_request() virtual method. If a widget used the wrappers inside its virtual method implementations, then the adjustments (such as widget margins) would be applied twice. GTK+ therefore does not allow this and will warn if you try to do it.
Of course if you are getting the size request for another widget, such as a child of a container, you must use the wrapper APIs. Otherwise, you would not properly consider widget margins, GtkSizeGroup, and so forth.
Since 3.10 Gtk+ also supports baseline vertical alignment of widgets. This means that widgets are positioned such that the typographical baseline of widgets in the same row are aligned. This happens if a widget supports baselines, has a vertical alignment of GTK_ALIGN_BASELINE, and is inside a container that supports baselines and has a natural "row" that it aligns to the baseline, or a baseline assigned to it by the grandparent.
Baseline alignment support for a widget is done by the GtkWidgetClass.get_preferred_height_and_baseline_for_width() virtual function. It allows you to report a baseline in combination with the minimum and natural height. If there is no baseline you can return -1 to indicate this. The default implementation of this virtual function calls into the GtkWidgetClass.get_preferred_height() and GtkWidgetClass.get_preferred_height_for_width(), so if baselines are not supported it doesn't need to be implemented.
If a widget ends up baseline aligned it will be allocated all the space in the parent as if it was GTK_ALIGN_FILL, but the selected baseline can be found via gtk_widget_get_allocated_baseline(). If this has a value other than -1 you need to align the widget such that the baseline appears at the position.
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Style Properties
GtkWidget introduces style properties - these are basically object properties that are stored not on the object, but in the style object associated to the widget. Style properties are set in resource files. This mechanism is used for configuring such things as the location of the scrollbar arrows through the theme, giving theme authors more control over the look of applications without the need to write a theme engine in C.
Use gtk_widget_class_install_style_property() to install style properties for a widget class, gtk_widget_class_find_style_property() or gtk_widget_class_list_style_properties() to get information about existing style properties and gtk_widget_style_get_property(), gtk_widget_style_get() or gtk_widget_style_get_valist() to obtain the value of a style property.
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GtkWidget as GtkBuildable
The GtkWidget implementation of the GtkBuildable interface supports a custom <accelerator> element, which has attributes named key, modifiers and signal and allows to specify accelerators.
In addition to accelerators, GtkWidget also support a custom <accessible> element, which supports actions and relations. Properties on the accessible implementation of an object can be set by accessing the internal child "accessible" of a GtkWidget.
Finally, GtkWidget allows style information such as style classes to be associated with widgets, using the custom <style> element:
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Building composite widgets from template XML
GtkWidget exposes some facilities to automate the proceedure of creating composite widgets using GtkBuilder interface description language.
To create composite widgets with GtkBuilder XML, one must associate the interface description with the widget class at class initialization time using gtk_widget_class_set_template().
The interface description semantics expected in composite template descriptions is slightly different from regulare GtkBuilder XML.
Unlike regular interface descriptions, gtk_widget_class_set_template() will expect a <template> tag as a direct child of the toplevel <interface> tag. The <template> tag must specify the "class" attribute which must be the type name of the widget. Optionally, the "parent" attribute may be specified to specify the direct parent type of the widget type, this is ignored by the GtkBuilder but required for Glade to introspect what kind of properties and internal children exist for a given type when the actual type does not exist.
The XML which is contained inside the <template> tag behaves as if it were added to the <object> tag defining widget itself. You may set properties on widget by inserting <property> tags into the <template> tag, and also add <child> tags to add children and extend widget in the normal way you would with <object> tags.
Additionally, <object> tags can also be added before and after the initial <template> tag in the normal way, allowing one to define auxilary objects which might be referenced by other widgets declared as children of the <template> tag.