class Gio::Permission

Overview

A #GPermission represents the status of the caller's permission to perform a certain action.

You can query if the action is currently allowed and if it is possible to acquire the permission so that the action will be allowed in the future.

There is also an API to actually acquire the permission and one to release it.

As an example, a #GPermission might represent the ability for the user to write to a #GSettings object. This #GPermission object could then be used to decide if it is appropriate to show a "Click here to unlock" button in a dialog and to provide the mechanism to invoke when that button is clicked.

Direct Known Subclasses

Defined in:

lib/gi-crystal/src/auto/gio-2.0/permission.cr

Constructors

Class Method Summary

Instance Method Summary

Instance methods inherited from class GObject::Object

bind_property(source_property : String, target : GObject::Object, target_property : String, flags : GObject::BindingFlags) : GObject::Binding bind_property, bind_property_full(source_property : String, target : GObject::Object, target_property : String, flags : GObject::BindingFlags, transform_to : GObject::Closure, transform_from : GObject::Closure) : GObject::Binding bind_property_full, data(key : String) : Pointer(Void)? data, finalize finalize, freeze_notify : Nil freeze_notify, getv(names : Enumerable(String), values : Enumerable(_)) : Nil getv, notify(property_name : String) : Nil notify, notify_by_pspec(pspec : GObject::ParamSpec) : Nil notify_by_pspec, notify_signal notify_signal, property(property_name : String, value : _) : Nil property, qdata(quark : UInt32) : Pointer(Void)? qdata, ref_count : UInt32 ref_count, run_dispose : Nil run_dispose, set_data(key : String, data : Pointer(Void)?) : Nil set_data, set_property(property_name : String, value : _) : Nil set_property, steal_data(key : String) : Pointer(Void)? steal_data, steal_qdata(quark : UInt32) : Pointer(Void)? steal_qdata, thaw_notify : Nil thaw_notify, to_unsafe : Pointer(Void) to_unsafe, watch_closure(closure : GObject::Closure) : Nil watch_closure

Constructor methods inherited from class GObject::Object

cast(obj : GObject::Object) : self cast, cast?(obj : GObject::Object) : self? cast?, new(pointer : Pointer(Void), transfer : GICrystal::Transfer)
new new, newv(object_type : UInt64, parameters : Enumerable(GObject::Parameter)) : self newv

Class methods inherited from class GObject::Object

compat_control(what : UInt64, data : Pointer(Void)?) : UInt64 compat_control, g_type : UInt64 g_type, interface_find_property(g_iface : GObject::TypeInterface, property_name : String) : GObject::ParamSpec interface_find_property, interface_list_properties(g_iface : GObject::TypeInterface) : Enumerable(GObject::ParamSpec) interface_list_properties

Constructor Detail

def self.new #

Initialize a new Permission.


def self.new(*, allowed : Bool? = nil, can_acquire : Bool? = nil, can_release : Bool? = nil) #

Class Method Detail

def self.g_type : UInt64 #

Returns the type id (GType) registered in GLib type system.


Instance Method Detail

def acquire(cancellable : Gio::Cancellable?) : Bool #

Attempts to acquire the permission represented by @permission.

The precise method by which this happens depends on the permission and the underlying authentication mechanism. A simple example is that a dialog may appear asking the user to enter their password.

You should check with g_permission_get_can_acquire() before calling this function.

If the permission is acquired then true is returned. Otherwise, false is returned and @error is set appropriately.

This call is blocking, likely for a very long time (in the case that user interaction is required). See g_permission_acquire_async() for the non-blocking version.


def acquire_async(cancellable : Gio::Cancellable?, callback : Gio::AsyncReadyCallback?, user_data : Pointer(Void)?) : Nil #

Attempts to acquire the permission represented by @permission.

This is the first half of the asynchronous version of g_permission_acquire().


def acquire_finish(result : Gio::AsyncResult) : Bool #

Collects the result of attempting to acquire the permission represented by @permission.

This is the second half of the asynchronous version of g_permission_acquire().


def allowed : Bool #

Gets the value of the 'allowed' property. This property is true if the caller currently has permission to perform the action that @permission represents the permission to perform.


def allowed? : Bool #

def can_acquire : Bool #

Gets the value of the 'can-acquire' property. This property is true if it is generally possible to acquire the permission by calling g_permission_acquire().


def can_acquire? : Bool #

def can_release : Bool #

Gets the value of the 'can-release' property. This property is true if it is generally possible to release the permission by calling g_permission_release().


def can_release? : Bool #

def impl_update(allowed : Bool, can_acquire : Bool, can_release : Bool) : Nil #

This function is called by the #GPermission implementation to update the properties of the permission. You should never call this function except from a #GPermission implementation.

GObject notify signals are generated, as appropriate.


def release(cancellable : Gio::Cancellable?) : Bool #

Attempts to release the permission represented by @permission.

The precise method by which this happens depends on the permission and the underlying authentication mechanism. In most cases the permission will be dropped immediately without further action.

You should check with g_permission_get_can_release() before calling this function.

If the permission is released then true is returned. Otherwise, false is returned and @error is set appropriately.

This call is blocking, likely for a very long time (in the case that user interaction is required). See g_permission_release_async() for the non-blocking version.


def release_async(cancellable : Gio::Cancellable?, callback : Gio::AsyncReadyCallback?, user_data : Pointer(Void)?) : Nil #

Attempts to release the permission represented by @permission.

This is the first half of the asynchronous version of g_permission_release().


def release_finish(result : Gio::AsyncResult) : Bool #

Collects the result of attempting to release the permission represented by @permission.

This is the second half of the asynchronous version of g_permission_release().