gtk.AccelGroup
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## gtk.AccelGroup

gtk.AccelGroup — a group of accelerators for a Window hierarchy

## Synopsis

    class gtk.AccelGroup(gobject.GObject):
        gtk.AccelGroup()
        def lock()
        def unlock()
        def connect(accel_key, accel_mods, accel_flags, callback)
        def connect_group(accel_key, accel_mods, accel_flags, callback)
        def connect_by_path(accel_path, callback)
        def disconnect_key(accel_key, accel_mods)

    Functions

        def gtk.accelerator_valid(keyval, modifiers)
        def gtk.accelerator_parse(accelerator)
        def gtk.accelerator_name(accelerator_key, accelerator_mods)
        def gtk.accelerator_set_default_mod_mask(default_mod_mask)
        def gtk.accelerator_get_default_mod_mask()
        def gtk.accelerator_get_label(accelerator_key, accelerator_mods)
        def gtk.accel_groups_from_object(object)

## Ancestry

    +-- gobject.GObject
      +-- gtk.AccelGroup

## gtk.AccelGroup Signal Prototypes

"accel-activate" | `def callback(`accelgroup`, `acceleratable`, `accel_key`, `accel_mods`, `user_param1`, `...`)`
"accel-changed" | `def callback(`accelgroup`, `accel_key`, `accel_mods`, `closure`, `user_param1`, `...`)`

## Description

A `gtk.AccelGroup` object groups all the accelerators for the associated window hierarchy (either `gtk.Window` (or a descendant) or `gtk.MenuShell` (or a descendant)). Once the `gtk.AccelGroup` is associated with a window or menu (using `gtk.Window.add_accel_group`() or `gtk.Menu.set_accel_group`()), accelerators can be added to the widget or one of its children by using `gtk.Widget.add_accelerator`() . Accelerators can also be added by using a `gtk.ItemFactory`.

Note that accelerators are different from mnemonics. Accelerators are shortcuts for activating a menu item; they appear alongside the menu item they're a shortcut for. For example Ctrl+Q might appear alongside the Files->Quit menu item. Mnemonics are shortcuts for GUI elements such as text entries or buttons; they appear as underlined characters. Of course, menu items can have both accelerators and mnemonics.

## Constructor

        gtk.AccelGroup()

Returns : | an AccelGroup object

Creates a new `gtk.AccelGroup` object.

## Methods

### gtk.AccelGroup.lock

        def lock()

The `lock`() method locks the accelerator group. preventing its accelerators from being changed during runtime. Refer to `gtk.accel_map_change_entry`() about runtime accelerator changes.

If called more than once, the accelerator group remains locked until `gtk.AccelGroup.unlock`() has been called an equivalent number of times.

### gtk.AccelGroup.unlock

        def unlock()

The `unlock`() method undoes the last call to `gtk.AccelGroup.lock`() for this accelerator group.

### gtk.AccelGroup.connect_group

        def connect(accel_key, accel_mods, accel_flags, callback)

`accel_key` : | key value of the accelerator
`accel_mods` : | modifier combination of the accelerator
`accel_flags` : | a flag mask to configure this accelerator
`callback` : | a function or method to be executed upon accelerator activation

### Note

This method is available in PyGTK 2.2 as `connect`() and was changed in PyGTK 2.4 and above to `connect_group`() to avoid conflict with the `gobject.GObject.connect`() method.

The `connect_group`() method installs an accelerator in the accelerator group. When the accelerator group is being activated, the function (or method) specified by `callback` will be invoked if the accelerator key and modifier key match those specified by `accel_key` and `accel_mods`.

The value of `modifier` is a combination of the GDK Modifier Constants. `accel_flags` is a combination of `gtk.ACCEL_VISIBLE` and `gtk.ACCEL_LOCKED`.

The `callback` function is defined as:

      def callback(accel_group, acceleratable, keyval, modifier)

where `accel_group` is the accelerator group, `acceleratable` is the object that the `accel_group` is attached to (e.g. a `gtk.Window`), `keyval` is the accelerator key and `modifier` is the key modifier. `callback` returns `True` if the accelerator was handled by `callback`.

### Note

Due to implementation details, a single function or method can only be connected to one accelerator group.

### gtk.AccelGroup.connect_by_path

        def connect_by_path(accel_path, callback)

`accel_path` : | path used for determining key and modifiers.
`callback` : | function or method to be executed upon accelerator activation

### Note

This method is available in PyGTK 2.4 and above

The `connect_by_path`() method installs an accelerator in the accelerator group, using an accelerator path to look up the appropriate key and modifiers (see the function `gtk.accel_map_add_entry`()). When the accelerator group is being activated, the function (or method) specified by `callback` will be invoked if the `accel_key` and `accel_mods` that cause the activation match the key and modifiers for the accelerator path specified by `accel_path`.

The `callback` function is defined as:

      def callback(accel_group, acceleratable, keyval, modifier)

where `accel_group` is the accelerator group, `acceleratable` is the object that the `accel_group` is attached to (e.g. a `gtk.Window`), `keyval` is the accelerator key and `modifier` is the key modifier. `callback` returns `True` if the accelerator was handled by `callback`.

### gtk.AccelGroup.disconnect_key

        def disconnect_key(accel_key, accel_mods)

`accel_key` : | key value of the accelerator
`accel_mods` : | modifier combination of the accelerator
Returns : | `True` if there was an accelerator which was removed, `False` otherwise

The `disconnect`() method removes a previously installed accelerator specified by `accel_key` and `accel_mods` from the accelerator group.

## Functions

### gtk.accelerator_valid

        def gtk.accelerator_valid(keyval, modifiers)

`keyval` : | a key value
`modifiers` : | a modifier mask
Returns : | `True` if the accelerator is valid

The `gtk.accelerator_valid`() function returns `True` if the specified `keyval` and `modifiers` constitute a valid keyboard accelerator. For example, the `ord('a')` keyval plus `gtk.gdk.CONTROL_MASK` is valid - this is a Control+a accelerator. The value of `modifiers` is a combination of the GDK Modifier Constants.

### gtk.accelerator_parse

        def gtk.accelerator_parse(accelerator)

`accelerator` : | a string representing an accelerator
Returns : | a 2-tuple containing the keyval and modifier mask of the accelerator

The `gtk.accelerator_parse`() function parses the specified `accelerator` string and returns a 2-tuple containing the keyval and modifier mask corresponding to `accelerator`. The format looks like "<Control>a" or "<Shift><Alt>F1" or "<Release>z" (the last one is for key release). The parser is fairly liberal and allows lower or upper case, and also abbreviations such as "<Ctl>" and "<Ctrl>". If the parse fails, the tuple values will both be 0 (zero). See the `gtk.accelerator_valid`() function for more details.

### gtk.accelerator_name

        def gtk.accelerator_name()

`accelerator_key` : | a key value
`accelerator_mods` : | a modifier mask
Returns : | a string representing the accelerator or `None` if not a valid accelerator

The `gtk.accelerator_name`() function converts the accelerator keyval and modifier mask (specified by `accelerator_key` and `accelerator_mods`) into a string parseable by the `gtk.accelerator_parse`() function. For example, if you pass in `ord('q')` and `gtk.gdk.CONTROL_MASK`, this function returns "<Control>q".

### gtk.accelerator_set_default_mod_mask

        def gtk.accelerator_set_default_mod_mask(default_mod_mask)

`default_mod_mask` : | the new default accelerator modifier mask

The `gtk.accelerator_set_default_mod_mask`() function sets the modifiers (specified by `default_mod_mask`) that will be considered significant for keyboard accelerators. The default mod mask is `gtk.gdk.CONTROL_MASK` | `gtk.gdk.SHIFT_MASK` | `gtk.gdk.MOD1_MASK`, that is, Control, Shift, and Alt. Other modifiers will by default be ignored by `gtk.AccelGroup`. You must include at least the three default modifiers in any value you pass to this function. The default mod mask should be changed on application startup, before using any accelerator groups. The value of `default_mod_mask` is a combination of the GDK Modifier Constants.

### gtk.accelerator_get_default_mod_mask

        def gtk.accelerator_get_default_mod_mask()

Returns : | the default accelerator modifier mask

The `gtk.accelerator_get_default_mod_mask`() function returns the default accelerator modifier mask as set by the `gtk.accelerator_set_default_mod_mask`() function. See the `gtk.accelerator_set_default_mod_mask`() function for more detail on modifier masks.

### gtk.accelerator_get_label

        def gtk.accelerator_get_label(accelerator_key, accelerator_mods)

`accelerator_key` : | a key value
`accelerator_mods` : | a modifier mask
Returns : | a string representing the accelerator

### Note

This function is available in PyGTK 2.6 and above.

The `gtk.accelerator_get_label`() function converts the accelerator keyval and modifier mask specified by `accelerator_key` and `accelerator_mods` respectively into a string which can be used to represent the accelerator to the user. The value of `accelerator_mods` is a combination of the GDK Modifier Constants.

### gtk.accel_groups_from_object

        def gtk.accel_groups_from_object(object)

`object` : | a GObject usually a `gtk.Window`

### Note

This function is available in PyGTK 2.4 and above.

The `gtk.accel_groups_from_object`() function returns a list of all the `gtk.AccelGroup` objects attached to the object specified by `object`.

## Signals

### The "accel-activate" gtk.AccelGroup Signal

        def callback(accelgroup, acceleratable, accel_key, accel_mods, user_param1, ...)

`accelgroup` : | the accelgroup that received the signal
`acceleratable` : | the object that the accelerator is associated with
`accel_key` : | the accelerator key value
`accel_mods` : | the accelerator modifiers
`user_param1` : | the first user parameter (if any) specified with the `gobject.GObject.connect`() method
`...` : | additional user parameters (if any)
Returns : | `True` if the accelerator was handled

The "accel-activate" signal is emitted when an accelerator is activated.

### The "accel-changed" gtk.AccelGroup Signal

        def callback(accelgroup, accel_key, accel_mods, closure, user_param1, ...)

`accelgroup` : | the accelgroup that received the signal
`accel_key` : | the key value of the accelerator
`accel_mods` : | the modifiers of the accelerator
`closure` : | the closure of the accelerator
`user_param1` : | the first user parameter (if any) specified with the `connect`() method
`...` : | additional user parameters (if any)

The "accel-changed" signal is emitted when an accelerator is added or removed from an accelerator group.

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