Accelerator Maps

Accelerator Maps — Loadable keyboard accelerator specifications

Signals

Types and Values

Object Hierarchy

    GObject
    ╰── GtkAccelMap

Includes

#include <gtk/gtk.h>

Description

Accelerator maps are used to define runtime configurable accelerators. Functions for manipulating them are are usually used by higher level convenience mechanisms like GtkUIManager and are thus considered “low-level”. You’ll want to use them if you’re manually creating menus that should have user-configurable accelerators.

An accelerator is uniquely defined by:

  • accelerator path

  • accelerator key

  • accelerator modifiers

The accelerator path must consist of “<WINDOWTYPE>/Category1/Category2/.../Action”, where WINDOWTYPE should be a unique application-specific identifier that corresponds to the kind of window the accelerator is being used in, e.g. “Gimp-Image”, “Abiword-Document” or “Gnumeric-Settings”. The “Category1/.../Action” portion is most appropriately chosen by the action the accelerator triggers, i.e. for accelerators on menu items, choose the item’s menu path, e.g. “File/Save As”, “Image/View/Zoom” or “Edit/Select All”. So a full valid accelerator path may look like: “<Gimp-Toolbox>/File/Dialogs/Tool Options...”.

All accelerators are stored inside one global GtkAccelMap that can be obtained using gtk_accel_map_get(). See Monitoring changes for additional details.

Manipulating accelerators

New accelerators can be added using gtk_accel_map_add_entry(). To search for specific accelerator, use gtk_accel_map_lookup_entry(). Modifications of existing accelerators should be done using gtk_accel_map_change_entry().

In order to avoid having some accelerators changed, they can be locked using gtk_accel_map_lock_path(). Unlocking is done using gtk_accel_map_unlock_path().


Saving and loading accelerator maps

Accelerator maps can be saved to and loaded from some external resource. For simple saving and loading from file, gtk_accel_map_save() and gtk_accel_map_load() are provided. Saving and loading can also be done by providing file descriptor to gtk_accel_map_save_fd() and gtk_accel_map_load_fd().


Monitoring changes

GtkAccelMap object is only useful for monitoring changes of accelerators. By connecting to “changed” signal, one can monitor changes of all accelerators. It is also possible to monitor only single accelerator path by using it as a detail of the “changed” signal.

Functions

GtkAccelMapForeach ()

void
(*GtkAccelMapForeach) (gpointer data,
                       const gchar *accel_path,
                       guint accel_key,
                       GdkModifierType accel_mods,
                       gboolean changed);

Parameters

data

User data passed to gtk_accel_map_foreach() or gtk_accel_map_foreach_unfiltered()

 

accel_path

Accel path of the current accelerator

 

accel_key

Key of the current accelerator

 

accel_mods

Modifiers of the current accelerator

 

changed

Changed flag of the accelerator (if TRUE, accelerator has changed during runtime and would need to be saved during an accelerator dump)

 

gtk_accel_map_add_entry ()

void
gtk_accel_map_add_entry (const gchar *accel_path,
                         guint accel_key,
                         GdkModifierType accel_mods);

Registers a new accelerator with the global accelerator map. This function should only be called once per accel_path with the canonical accel_key and accel_mods for this path. To change the accelerator during runtime programatically, use gtk_accel_map_change_entry().

Set accel_key and accel_mods to 0 to request a removal of the accelerator.

Note that accel_path string will be stored in a GQuark. Therefore, if you pass a static string, you can save some memory by interning it first with g_intern_static_string().

Parameters

accel_path

valid accelerator path

 

accel_key

the accelerator key

 

accel_mods

the accelerator modifiers

 

gtk_accel_map_lookup_entry ()

gboolean
gtk_accel_map_lookup_entry (const gchar *accel_path,
                            GtkAccelKey *key);

Looks up the accelerator entry for accel_path and fills in key .

Parameters

accel_path

a valid accelerator path

 

key

the accelerator key to be filled in (optional).

[allow-none][out]

Returns

TRUE if accel_path is known, FALSE otherwise


gtk_accel_map_change_entry ()

gboolean
gtk_accel_map_change_entry (const gchar *accel_path,
                            guint accel_key,
                            GdkModifierType accel_mods,
                            gboolean replace);

Changes the accel_key and accel_mods currently associated with accel_path . Due to conflicts with other accelerators, a change may not always be possible, replace indicates whether other accelerators may be deleted to resolve such conflicts. A change will only occur if all conflicts could be resolved (which might not be the case if conflicting accelerators are locked). Successful changes are indicated by a TRUE return value.

Note that accel_path string will be stored in a GQuark. Therefore, if you pass a static string, you can save some memory by interning it first with g_intern_static_string().

Parameters

accel_path

a valid accelerator path

 

accel_key

the new accelerator key

 

accel_mods

the new accelerator modifiers

 

replace

TRUE if other accelerators may be deleted upon conflicts

 

Returns

TRUE if the accelerator could be changed, FALSE otherwise


gtk_accel_map_load ()

void
gtk_accel_map_load (const gchar *file_name);

Parses a file previously saved with gtk_accel_map_save() for accelerator specifications, and propagates them accordingly.

Parameters

file_name

a file containing accelerator specifications, in the GLib file name encoding.

[type filename]

gtk_accel_map_save ()

void
gtk_accel_map_save (const gchar *file_name);

Saves current accelerator specifications (accelerator path, key and modifiers) to file_name . The file is written in a format suitable to be read back in by gtk_accel_map_load().

Parameters

file_name

the name of the file to contain accelerator specifications, in the GLib file name encoding.

[type filename]

gtk_accel_map_foreach ()

void
gtk_accel_map_foreach (gpointer data,
                       GtkAccelMapForeach foreach_func);

Loops over the entries in the accelerator map whose accel path doesn’t match any of the filters added with gtk_accel_map_add_filter(), and execute foreach_func on each. The signature of foreach_func is that of GtkAccelMapForeach, the changed parameter indicates whether this accelerator was changed during runtime (thus, would need saving during an accelerator map dump).

Parameters

data

data to be passed into foreach_func .

[allow-none]

foreach_func

function to be executed for each accel map entry which is not filtered out.

[scope call]

gtk_accel_map_load_fd ()

void
gtk_accel_map_load_fd (gint fd);

Filedescriptor variant of gtk_accel_map_load().

Note that the file descriptor will not be closed by this function.

Parameters

fd

a valid readable file descriptor

 

gtk_accel_map_save_fd ()

void
gtk_accel_map_save_fd (gint fd);

Filedescriptor variant of gtk_accel_map_save().

Note that the file descriptor will not be closed by this function.

Parameters

fd

a valid writable file descriptor

 

gtk_accel_map_load_scanner ()

void
gtk_accel_map_load_scanner (GScanner *scanner);

GScanner variant of gtk_accel_map_load().

Parameters

scanner

a GScanner which has already been provided with an input file

 

gtk_accel_map_add_filter ()

void
gtk_accel_map_add_filter (const gchar *filter_pattern);

Adds a filter to the global list of accel path filters.

Accel map entries whose accel path matches one of the filters are skipped by gtk_accel_map_foreach().

This function is intended for GTK+ modules that create their own menus, but don’t want them to be saved into the applications accelerator map dump.

Parameters

filter_pattern

a pattern (see GPatternSpec)

 

gtk_accel_map_foreach_unfiltered ()

void
gtk_accel_map_foreach_unfiltered (gpointer data,
                                  GtkAccelMapForeach foreach_func);

Loops over all entries in the accelerator map, and execute foreach_func on each. The signature of foreach_func is that of GtkAccelMapForeach, the changed parameter indicates whether this accelerator was changed during runtime (thus, would need saving during an accelerator map dump).

Parameters

data

data to be passed into foreach_func

 

foreach_func

function to be executed for each accel map entry.

[scope call]

gtk_accel_map_get ()

GtkAccelMap *
gtk_accel_map_get (void);

Gets the singleton global GtkAccelMap object. This object is useful only for notification of changes to the accelerator map via the ::changed signal; it isn’t a parameter to the other accelerator map functions.

Returns

the global GtkAccelMap object.

[transfer none]

Since: 2.4


gtk_accel_map_lock_path ()

void
gtk_accel_map_lock_path (const gchar *accel_path);

Locks the given accelerator path. If the accelerator map doesn’t yet contain an entry for accel_path , a new one is created.

Locking an accelerator path prevents its accelerator from being changed during runtime. A locked accelerator path can be unlocked by gtk_accel_map_unlock_path(). Refer to gtk_accel_map_change_entry() for information about runtime accelerator changes.

If called more than once, accel_path remains locked until gtk_accel_map_unlock_path() has been called an equivalent number of times.

Note that locking of individual accelerator paths is independent from locking the GtkAccelGroup containing them. For runtime accelerator changes to be possible, both the accelerator path and its GtkAccelGroup have to be unlocked.

Parameters

accel_path

a valid accelerator path

 

Since: 2.4


gtk_accel_map_unlock_path ()

void
gtk_accel_map_unlock_path (const gchar *accel_path);

Undoes the last call to gtk_accel_map_lock_path() on this accel_path . Refer to gtk_accel_map_lock_path() for information about accelerator path locking.

Parameters

accel_path

a valid accelerator path

 

Since: 2.4

Types and Values

GtkAccelMap

typedef struct _GtkAccelMap GtkAccelMap;

Signal Details

The “changed” signal

void
user_function (GtkAccelMap    *object,
               gchar          *accel_path,
               guint           accel_key,
               GdkModifierType accel_mods,
               gpointer        user_data)

Notifies of a change in the global accelerator map. The path is also used as the detail for the signal, so it is possible to connect to changed::accel_path.

Parameters

object

the global accel map object

 

accel_path

the path of the accelerator that changed

 

accel_key

the key value for the new accelerator

 

accel_mods

the modifier mask for the new accelerator

 

user_data

user data set when the signal handler was connected.

 

Flags: Has Details

Since: 2.4