The GSettingsBackend interface defines a generic interface for non-strictly-typed data that is stored in a hierarchy. To implement an alternative storage backend for GSettings, you need to implement the GSettingsBackend interface and then make it implement the extension point G_SETTINGS_BACKEND_EXTENSION_POINT_NAME
The interface defines methods for reading and writing values, a method for determining if writing of certain values will fail (lockdown) and a change notification mechanism.
The semantics of the interface are very precisely defined and implementations must carefully adhere to the expectations of callers that are documented on each of the interface methods.
Some of the GSettingsBackend functions accept or return a GTree These trees always have strings as keys and GVariant as values. g_settings_backend_create_tree() is a convenience function to create suitable trees.
The GSettingsBackend API is exported to allow third-party implementations, but does not carry the same stability guarantees as the public GIO API. For this reason, you have to define the C preprocessor symbol G_SETTINGS_ENABLE_BACKEND before including gio/gsettingsbackend.h.
Sets our main struct and passes it to the parent class.
Signals that a single key has possibly changed. Backend implementations should call this if a key has possibly changed its value.
This call is a convenience wrapper. It gets the list of changes from tree, computes the longest common prefix and calls g_settings_backend_changed().
Get the main Gtk struct
the main Gtk struct as a void*
Signals that a list of keys have possibly changed. Backend implementations should call this if keys have possibly changed their values.
Signals that all keys below a given path may have possibly changed. Backend implementations should call this if an entire path of keys have possibly changed their values.
Signals that the writability of all keys below a given path may have changed.
Signals that the writability of a single key has possibly changed.
Calculate the longest common prefix of all keys in a tree and write out an array of the key names relative to that prefix and, optionally, the value to store at each of those keys.
Returns the default GSettingsBackend It is possible to override the default by setting the GSETTINGS_BACKEND environment variable to the name of a settings backend.
Creates a keyfile-backed GSettingsBackend
Creates a memory-backed GSettingsBackend
Creates a readonly GSettingsBackend
the main Gtk struct