GtkBuildable

GtkBuildable — Interface for objects that can be built by GtkBuilder

Functions

const char * gtk_buildable_get_buildable_id ()

Types and Values

Object Hierarchy

    GInterface
    ╰── GtkBuildable

Prerequisites

GtkBuildable requires GObject.

Known Implementations

GtkBuildable is implemented by GtkAboutDialog, GtkActionBar, GtkAnyFilter, GtkAppChooserButton, GtkAppChooserDialog, GtkAppChooserWidget, GtkApplicationWindow, GtkAspectFrame, GtkAssistant, GtkBox, GtkButton, GtkCalendar, GtkCellArea, GtkCellAreaBox, GtkCellView, GtkCheckButton, GtkColorButton, GtkColorChooserDialog, GtkColorChooserWidget, GtkColumnView, GtkComboBox, GtkComboBoxText, GtkConstraintLayout, GtkDialog, GtkDragIcon, GtkDrawingArea, GtkDropDown, GtkEditableLabel, GtkEmojiChooser, GtkEntry, GtkEntryCompletion, GtkEveryFilter, GtkExpander, GtkFileChooserButton, GtkFileChooserDialog, GtkFileChooserWidget, GtkFileFilter, GtkFixed, GtkFlowBox, GtkFlowBoxChild, GtkFontButton, GtkFontChooserDialog, GtkFontChooserWidget, GtkFrame, GtkGLArea, GtkGrid, GtkGridView, GtkHeaderBar, GtkIconView, GtkImage, GtkInfoBar, GtkLabel, GtkLevelBar, GtkLinkButton, GtkListBox, GtkListBoxRow, GtkListStore, GtkListView, GtkLockButton, GtkMediaControls, GtkMenuButton, GtkMessageDialog, GtkMultiFilter, GtkMultiSorter, GtkNotebook, GtkOverlay, GtkPageSetupUnixDialog, GtkPaned, GtkPasswordEntry, GtkPicture, GtkPopover, GtkPopoverMenu, GtkPopoverMenuBar, GtkPrintUnixDialog, GtkProgressBar, GtkRange, GtkRevealer, GtkScale, GtkScaleButton, GtkScrollbar, GtkScrolledWindow, GtkSearchBar, GtkSearchEntry, GtkSeparator, GtkShortcutController, GtkShortcutLabel, GtkShortcutsGroup, GtkShortcutsSection, GtkShortcutsShortcut, GtkShortcutsWindow, GtkSizeGroup, GtkSpinButton, GtkSpinner, GtkStack, GtkStackSidebar, GtkStackSwitcher, GtkStatusbar, GtkStringList, GtkSwitch, GtkText, GtkTextTagTable, GtkTextView, GtkToggleButton, GtkTreeExpander, GtkTreeStore, GtkTreeView, GtkTreeViewColumn, GtkVideo, GtkViewport, GtkVolumeButton, GtkWidget, GtkWindow, GtkWindowControls and GtkWindowHandle.

Includes

#include <gtk/gtk.h>

Description

GtkBuildable allows objects to extend and customize their deserialization from GtkBuilder UI descriptions. The interface includes methods for setting names and properties of objects, parsing custom tags and constructing child objects.

The GtkBuildable interface is implemented by all widgets and many of the non-widget objects that are provided by GTK. The main user of this interface is GtkBuilder. There should be very little need for applications to call any of these functions directly.

An object only needs to implement this interface if it needs to extend the GtkBuilder format or run any extra routines at deserialization time.

Functions

gtk_buildable_get_buildable_id ()

const char *
gtk_buildable_get_buildable_id (GtkBuildable *buildable);

Gets the ID of the buildable object.

GtkBuilder sets the name based on the GtkBuilder UI definition used to construct the buildable .

Parameters

buildable

a GtkBuildable

 

Returns

the ID set with gtk_buildable_set_buildable_id()

Types and Values

GtkBuildable

typedef struct _GtkBuildable GtkBuildable;

struct GtkBuildableIface

struct GtkBuildableIface {
  GTypeInterface g_iface;

  /* virtual table */
  void          (* set_id)                 (GtkBuildable       *buildable,
                                            const char         *id);
  const char *  (* get_id)                 (GtkBuildable       *buildable);

  /**
   * GtkBuildableIface::add_child:
   * @buildable: a #GtkBuildable
   * @builder: a #GtkBuilder
   * @child: child to add
   * @type: (nullable): kind of child or %NULL
   *
   * Adds a child to @buildable. @type is an optional string
   * describing how the child should be added.
   */
  void          (* add_child)              (GtkBuildable       *buildable,
                                            GtkBuilder         *builder,
                                            GObject            *child,
                                            const char         *type);
  void          (* set_buildable_property) (GtkBuildable       *buildable,
                                            GtkBuilder         *builder,
                                            const char         *name,
                                            const GValue       *value);
  GObject *     (* construct_child)        (GtkBuildable       *buildable,
                                            GtkBuilder         *builder,
                                            const char         *name);

  /**
   * GtkBuildableIface::custom_tag_start:
   * @buildable: a #GtkBuildable
   * @builder: a #GtkBuilder used to construct this object
   * @child: (nullable): child object or %NULL for non-child tags
   * @tagname: name of tag
   * @parser: (out): a #GMarkupParser to fill in
   * @data: (out): return location for user data that will be passed in
   *   to parser functions
   *
   * Called for each unknown element under `<child>`.
   *
   * Returns: %TRUE if an object has a custom implementation, %FALSE
   *   if it doesn't.
   */
  gboolean      (* custom_tag_start)       (GtkBuildable       *buildable,
                                            GtkBuilder         *builder,
                                            GObject            *child,
                                            const char         *tagname,
                                            GtkBuildableParser *parser,
                                            gpointer           *data);
  /**
   * GtkBuildableIface::custom_tag_end:
   * @buildable: A #GtkBuildable
   * @builder: #GtkBuilder used to construct this object
   * @child: (nullable): child object or %NULL for non-child tags
   * @tagname: name of tag
   * @data: user data that will be passed in to parser functions
   *
   * Called at the end of each custom element handled by
   * the buildable.
   */
  void          (* custom_tag_end)         (GtkBuildable       *buildable,
                                            GtkBuilder         *builder,
                                            GObject            *child,
                                            const char         *tagname,
                                            gpointer            data);
   /**
    * GtkBuildableIface::custom_finished:
    * @buildable: a #GtkBuildable
    * @builder: a #GtkBuilder
    * @child: (nullable): child object or %NULL for non-child tags
    * @tagname: the name of the tag
    * @data: user data created in custom_tag_start
    *
    * Similar to gtk_buildable_parser_finished() but is
    * called once for each custom tag handled by the @buildable.
    */
  void          (* custom_finished)        (GtkBuildable       *buildable,
                                            GtkBuilder         *builder,
                                            GObject            *child,
                                            const char         *tagname,
                                            gpointer            data);
  void          (* parser_finished)        (GtkBuildable       *buildable,
                                            GtkBuilder         *builder);

  /**
   * GtkBuildableIface::get_internal_child:
   * @buildable: a #GtkBuildable
   * @builder: a #GtkBuilder
   * @childname: name of child
   *
   * Retrieves the internal child called @childname of the @buildable object.
   *
   * Returns: (transfer none): the internal child of the buildable object
   */
  GObject *     (* get_internal_child)     (GtkBuildable       *buildable,
                                            GtkBuilder         *builder,
                                            const char         *childname);
};

The GtkBuildableIface interface contains method that are necessary to allow GtkBuilder to construct an object from a GtkBuilder UI definition.

Members

set_id ()

Stores the id attribute given in the GtkBuilder UI definition. GtkWidget stores the name as object data. Implement this method if your object has some notion of “ID” and it makes sense to map the XML id attribute to it.

 

get_id ()

The getter corresponding to set_id . Implement this if you implement set_id .

 

add_child ()

Adds a child. The type parameter can be used to differentiate the kind of child. GtkWidget implements this to add event controllers to the widget, GtkNotebook uses the type to distinguish between page labels (of type "page-label") and normal children.

 

set_buildable_property ()

Sets a property of a buildable object. It is normally not necessary to implement this, g_object_set_property() is used by default. GtkWindow implements this to delay showing itself (i.e. setting the “visible” property) until the whole interface is created.

 

construct_child ()

Constructs a child of a buildable that has been specified as “constructor” in the UI definition. This can be used to reference a widget created in a <ui> tag which is outside of the normal GtkBuilder UI definition hierarchy. A reference to the constructed object is returned and becomes owned by the caller.

 

custom_tag_start ()

Implement this if the buildable needs to parse content below <child>. To handle an element, the implementation must fill in the parser and user_data and return TRUE. GtkWidget implements this to parse keyboard accelerators specified in <accelerator> elements. Note that user_data must be freed in custom_tag_end or custom_finished .

 

custom_tag_end ()

Called for the end tag of each custom element that is handled by the buildable (see custom_tag_start ).

 

custom_finished ()

Called for each custom tag handled by the buildable when the builder finishes parsing (see custom_tag_start )

 

parser_finished ()

Called when a builder finishes the parsing of a UI definition. It is normally not necessary to implement this, unless you need to perform special cleanup actions. GtkWindow sets the “visible” property here.

 

get_internal_child ()

Returns an internal child of a buildable. GtkDialog implements this to give access to its vbox , making it possible to add children to the vbox in a UI definition. Implement this if the buildable has internal children that may need to be accessed from a UI definition.

 

struct GtkBuildableParser

struct GtkBuildableParser {
  /* Called for open tags <foo bar="baz"> */
  void (*start_element)  (GtkBuildableParseContext *context,
                          const char               *element_name,
                          const char              **attribute_names,
                          const char              **attribute_values,
                          gpointer                  user_data,
                          GError                  **error);

  /* Called for close tags </foo> */
  void (*end_element)    (GtkBuildableParseContext *context,
                          const char               *element_name,
                          gpointer                  user_data,
                          GError                  **error);

  /* Called for character data */
  /* text is not nul-terminated */
  void (*text)           (GtkBuildableParseContext *context,
                          const char               *text,
                          gsize                     text_len,
                          gpointer                  user_data,
                          GError                  **error);

  /* Called on error, including one set by other
   * methods in the vtable. The GError should not be freed.
   */
  void (*error)          (GtkBuildableParseContext *context,
                          GError                   *error,
                          gpointer                 user_data);

  gpointer padding[4];
};