[gjs/ewlsh/register-type: 4/5] overrides: Support class fields in GObject.registerClass
- From: Evan Welsh <ewlsh src gnome org>
- To: commits-list gnome org
- Cc:
- Subject: [gjs/ewlsh/register-type: 4/5] overrides: Support class fields in GObject.registerClass
- Date: Fri, 31 Dec 2021 05:59:11 +0000 (UTC)
commit 27b6868b27fadab85094be5c61636290caacab65
Author: Evan Welsh <contact evanwelsh com>
Date: Thu Dec 30 21:55:02 2021 -0800
overrides: Support class fields in GObject.registerClass
modules/core/_common.js | 25 ++-
modules/core/overrides/GObject.js | 399 ++++++++++++++++++++++++++++----------
modules/core/overrides/Gtk.js | 113 ++++++-----
3 files changed, 379 insertions(+), 158 deletions(-)
---
diff --git a/modules/core/_common.js b/modules/core/_common.js
index edc70215..4e361e16 100644
--- a/modules/core/_common.js
+++ b/modules/core/_common.js
@@ -3,11 +3,13 @@
// SPDX-License-Identifier: MIT OR LGPL-2.0-or-later
// SPDX-FileCopyrightText: 2020 Philip Chimento <philip chimento gmail com>
-/* exported _checkAccessors */
+/* exported _checkAccessors, _registerType, definePublicProperties, definePrivateProperties */
// This is a helper module in which to put code that is common between the
// legacy GObject.Class system and the new GObject.registerClass system.
+var _registerType = Symbol('GObject register type hook');
+
function _generateAccessors(pspec, propdesc, GObject) {
const {name, flags} = pspec;
const readable = flags & GObject.ParamFlags.READABLE;
@@ -90,3 +92,24 @@ function _checkAccessors(proto, pspec, GObject) {
Object.defineProperty(proto, camelName, propdesc);
}
}
+
+function definePublicProperties(object, values) {
+ Object.defineProperties(object, Object.getOwnPropertyDescriptors(values));
+}
+
+function definePrivateProperties(object, values) {
+ const propertyKeys = [...Object.getOwnPropertyNames(values), ...Object.getOwnPropertySymbols(values)];
+
+ const privateDescriptors = Object.fromEntries(propertyKeys.map(key => {
+ const descriptor = Object.getOwnPropertyDescriptor(values, key);
+
+ return [key, {
+ ...descriptor,
+ ...'value' in descriptor ? {writable: false} : {},
+ configurable: false,
+ enumerable: false,
+ }];
+ }));
+
+ Object.defineProperties(object, privateDescriptors);
+}
diff --git a/modules/core/overrides/GObject.js b/modules/core/overrides/GObject.js
index 6bfaf144..f7817e80 100644
--- a/modules/core/overrides/GObject.js
+++ b/modules/core/overrides/GObject.js
@@ -5,7 +5,7 @@
const Gi = imports._gi;
const {GjsPrivate, GLib} = imports.gi;
-const {_checkAccessors} = imports._common;
+const {_checkAccessors, _registerType, definePublicProperties, definePrivateProperties} = imports._common;
const Legacy = imports._legacy;
let GObject;
@@ -23,6 +23,38 @@ var _gtkCssName = Symbol('GTK widget CSS name');
var _gtkInternalChildren = Symbol('GTK widget template internal children');
var _gtkTemplate = Symbol('GTK widget template');
+function _mapWidgetDefinitionToClass(klass, metaInfo) {
+ if ('CssName' in metaInfo)
+ klass[_gtkCssName] = metaInfo.CssName;
+ if ('Template' in metaInfo)
+ klass[_gtkTemplate] = metaInfo.Template;
+ if ('Children' in metaInfo)
+ klass[_gtkChildren] = metaInfo.Children;
+ if ('InternalChildren' in metaInfo)
+ klass[_gtkInternalChildren] = metaInfo.InternalChildren;
+}
+
+function _mapTypeDefinition(klass, metaInfo) {
+ if ('GTypeName' in metaInfo)
+ klass[GTypeName] = metaInfo.GTypeName;
+ if ('GTypeFlags' in metaInfo)
+ klass[GTypeFlags] = metaInfo.GTypeFlags;
+ if ('Properties' in metaInfo)
+ klass[properties] = metaInfo.Properties;
+ if ('Signals' in metaInfo)
+ klass[signals] = metaInfo.Signals;
+}
+
+function _mapClassDefinition(klass, metaInfo) {
+ if ('Implements' in metaInfo)
+ klass[interfaces] = metaInfo.Implements;
+}
+
+function _mapInterfaceDefinition(klass, metaInfo) {
+ if ('Requires' in metaInfo)
+ klass[requires] = metaInfo.Requires;
+}
+
function registerClass(...args) {
let klass = args[0];
if (args.length === 2) {
@@ -42,40 +74,125 @@ function registerClass(...args) {
// standard, this function can be used directly as a decorator.
let metaInfo = args[0];
klass = args[1];
- if ('GTypeName' in metaInfo)
- klass[GTypeName] = metaInfo.GTypeName;
- if ('GTypeFlags' in metaInfo)
- klass[GTypeFlags] = metaInfo.GTypeFlags;
- if ('Implements' in metaInfo)
- klass[interfaces] = metaInfo.Implements;
- if ('Properties' in metaInfo)
- klass[properties] = metaInfo.Properties;
- if ('Signals' in metaInfo)
- klass[signals] = metaInfo.Signals;
- if ('Requires' in metaInfo)
- klass[requires] = metaInfo.Requires;
- if ('CssName' in metaInfo)
- klass[_gtkCssName] = metaInfo.CssName;
- if ('Template' in metaInfo)
- klass[_gtkTemplate] = metaInfo.Template;
- if ('Children' in metaInfo)
- klass[_gtkChildren] = metaInfo.Children;
- if ('InternalChildren' in metaInfo)
- klass[_gtkInternalChildren] = metaInfo.InternalChildren;
+
+ _mapTypeDefinition(klass, metaInfo);
+ _mapClassDefinition(klass, metaInfo);
+ _mapInterfaceDefinition(klass, metaInfo);
+ _mapWidgetDefinitionToClass(klass, metaInfo);
+ }
+
+ _assertDerivesFromGObject(klass, [GObject.Object, GObject.Interface], 'registerClass');
+
+ if ('_classInit' in klass) {
+ klass = klass._classInit(klass);
+ } else {
+ // Lang.Class compatibility.
+ klass = _resolveLegacyClassFunction(klass, '_classInit')?.(klass);
}
- if (!(klass.prototype instanceof GObject.Object) &&
- !(klass.prototype instanceof GObject.Interface)) {
- throw new TypeError('GObject.registerClass() used with invalid base ' +
+ return klass;
+}
+
+function _assertDerivesFromGObject(klass, parents, functionName) {
+ if (parents.every(parent => !(klass.prototype instanceof parent))) {
+ throw new TypeError(`GObject.${functionName}() used with invalid base ` +
`class (is ${Object.getPrototypeOf(klass).name})`);
}
+}
+function _resolveLegacyClassFunction(klass, func) {
// Find the "least derived" class with a _classInit static function; there
// definitely is one, since this class must inherit from GObject
let initclass = klass;
- while (typeof initclass._classInit === 'undefined')
+ while (typeof initclass[func] === 'undefined')
initclass = Object.getPrototypeOf(initclass.prototype).constructor;
- return initclass._classInit(klass);
+ return initclass[func];
+}
+
+function _hookupVFuncs(prototype, gobject_prototype, gtype) {
+ Object.getOwnPropertyNames(prototype)
+ .filter(name => name.startsWith('vfunc_') || name.startsWith('on_'))
+ .forEach(name => {
+ let descr = Object.getOwnPropertyDescriptor(prototype, name);
+ if (typeof descr.value !== 'function')
+ return;
+
+ let func = prototype[name];
+
+ if (name.startsWith('vfunc_')) {
+ gobject_prototype[Gi.hook_up_vfunc_symbol](name.slice(6), func);
+ } else if (name.startsWith('on_')) {
+ let id = GObject.signal_lookup(name.slice(3).replace('_', '-'),
+ gtype);
+ if (id !== 0) {
+ GObject.signal_override_class_closure(id, gtype, function (...argArray) {
+ let emitter = argArray.shift();
+
+ return func.apply(emitter, argArray);
+ });
+ }
+ }
+ });
+}
+
+function _defineGType(klass, giPrototype, registeredType) {
+ const config = {
+ enumerable: false,
+ configurable: false,
+ };
+
+ /**
+ * class Example {
+ * // The JS object for this class' ObjectPrototype
+ * static [Gi.gobject_prototype_symbol] = ...
+ * static get $gtype () {
+ * return ...;
+ * }
+ * static set $gtype (value) {}
+ * }
+ *
+ * // Equal to the same property on the constructor
+ * Example.prototype[Gi.gobject_prototype_symbol] = ...
+ */
+
+ Object.defineProperties(klass, {
+ $gtype: {
+ ...config,
+ set() {
+ // Setting $gtype is a no-op.
+ },
+ get() {
+ return registeredType;
+ },
+ },
+ });
+
+ Object.defineProperty(klass.prototype, Gi.gobject_prototype_symbol, {
+ ...config,
+ writable: false,
+ value: giPrototype,
+ });
+}
+
+function _createInterfaceGenerics(klass) {
+ Object.getOwnPropertyNames(klass.prototype)
+ .filter(key => key !== 'constructor')
+ .concat(Object.getOwnPropertySymbols(klass.prototype))
+ .forEach(key => {
+ let descr = Object.getOwnPropertyDescriptor(klass.prototype, key);
+
+ // Create wrappers on the interface object so that generics work (e.g.
+ // SomeInterface.some_function(this, blah) instead of
+ // SomeInterface.prototype.some_function.call(this, blah)
+ if (typeof descr.value === 'function') {
+ let interfaceProto = klass.prototype; // capture in closure
+ klass[key] = function (thisObj, ...args) {
+ return interfaceProto[key].call(thisObj, ...args);
+ };
+ }
+
+ Object.defineProperty(klass.prototype, key, descr);
+ });
}
// Some common functions between GObject.Class and GObject.Interface
@@ -166,14 +283,26 @@ function _propertiesAsArray(klass) {
return propertiesArray;
}
-function _copyAllDescriptors(target, source, filter) {
- Object.getOwnPropertyNames(source)
- .filter(key => !['prototype', 'constructor'].concat(filter).includes(key))
- .concat(Object.getOwnPropertySymbols(source))
- .forEach(key => {
- let descriptor = Object.getOwnPropertyDescriptor(source, key);
- Object.defineProperty(target, key, descriptor);
- });
+function _copyInterfacePrototypeDescriptors(targetPrototype, sourceInterface) {
+ Object.entries(Object.getOwnPropertyDescriptors(sourceInterface))
+ .filter(([key, descriptor]) =>
+ // Don't attempt to copy the constructor or toString implementations
+ !['constructor', 'toString'].includes(key) &&
+ // Ignore properties starting with __
+ (
+ typeof key !== 'string' || !key.startsWith('__')
+ ) &&
+ // Don't override an implementation on the target
+ !targetPrototype.hasOwnProperty(key) &&
+ descriptor &&
+ // Only copy if the descriptor has a getter, is a function, or is enumerable.
+ (
+ typeof descriptor.value === 'function' || descriptor.get || descriptor.enumerable
+ )
+ )
+ .forEach(([key, descriptor]) => {
+ Object.defineProperty(targetPrototype, key, descriptor);
+ });
}
function _interfacePresent(required, klass) {
@@ -222,6 +351,14 @@ function _checkInterface(iface, proto) {
}
}
+function _checkProperties(klass) {
+ if (!klass.hasOwnProperty(properties))
+ return;
+
+ for (let pspec of Object.values(klass[properties]))
+ _checkAccessors(klass.prototype, pspec, GObject);
+}
+
function _init() {
GObject = this;
@@ -236,7 +373,7 @@ function _init() {
GObject.gtypeNameBasedOnJSPath = false;
- _makeDummyClass(GObject, 'VoidType', 'NONE', 'void', function () {});
+ _makeDummyClass(GObject, 'VoidType', 'NONE', 'void', function () { });
_makeDummyClass(GObject, 'Char', 'CHAR', 'gchar', Number);
_makeDummyClass(GObject, 'UChar', 'UCHAR', 'guchar', Number);
_makeDummyClass(GObject, 'Unichar', 'UNICHAR', 'gint', String);
@@ -431,98 +568,150 @@ function _init() {
GObject.registerClass = registerClass;
- GObject.Object._classInit = function (klass) {
- let gtypename = _createGTypeName(klass);
- let gflags = klass.hasOwnProperty(GTypeFlags) ? klass[GTypeFlags] : 0;
- let gobjectInterfaces = klass.hasOwnProperty(interfaces) ? klass[interfaces] : [];
- let propertiesArray = _propertiesAsArray(klass);
- let parent = Object.getPrototypeOf(klass);
- let gobjectSignals = klass.hasOwnProperty(signals) ? klass[signals] : [];
+ const {toString} = GObject.Object.prototype;
- propertiesArray.forEach(pspec => _checkAccessors(klass.prototype, pspec, GObject));
+ Object.assign(GObject.Object.prototype, {
+ toString() {
+ if (!this.constructor)
+ return Object.prototype.toString.call(this);
- let newClass = Gi.register_type(parent.prototype, gtypename, gflags,
- gobjectInterfaces, propertiesArray);
- Object.setPrototypeOf(newClass, parent);
+ // Use the native toString if this is not a custom class.
+ if (!this.constructor.prototype[Gi.gobject_prototype_symbol])
+ return toString.call(this);
- _createSignals(newClass.$gtype, gobjectSignals);
+ const isInstance = this !== this.constructor.prototype;
- _copyAllDescriptors(newClass, klass);
- gobjectInterfaces.forEach(iface =>
- _copyAllDescriptors(newClass.prototype, iface.prototype,
- ['toString']));
- _copyAllDescriptors(newClass.prototype, klass.prototype);
+ let out = '';
+ if (isInstance)
+ out += '[object instance wrapper';
+ else
+ out += '[GObject prototype of';
- Object.getOwnPropertyNames(newClass.prototype)
- .filter(name => name.startsWith('vfunc_') || name.startsWith('on_'))
- .forEach(name => {
- let descr = Object.getOwnPropertyDescriptor(newClass.prototype, name);
- if (typeof descr.value !== 'function')
- return;
- let func = newClass.prototype[name];
+ try {
+ let gtype = this.constructor.$gtype;
- if (name.startsWith('vfunc_')) {
- newClass.prototype[Gi.hook_up_vfunc_symbol](name.slice(6), func);
- } else if (name.startsWith('on_')) {
- let id = GObject.signal_lookup(name.slice(3).replace('_', '-'),
- newClass.$gtype);
- if (id !== 0) {
- GObject.signal_override_class_closure(id, newClass.$gtype, function (...argArray) {
- let emitter = argArray.shift();
-
- return func.apply(emitter, argArray);
- });
- }
+ out += ` GType:${GObject.type_name(gtype)}`;
+ } catch {
+ out += ' GType:unknown';
}
- });
- gobjectInterfaces.forEach(iface =>
- _checkInterface(iface, newClass.prototype));
+ try {
+ out += ` jsobj@${imports.system.addressOf(this)}`;
+ } catch { }
+
+ try {
+ if (isInstance)
+ out += ` native@${imports.system.addressOfGObject(this)}`;
+ } catch { }
- // For backwards compatibility only. Use instanceof instead.
- newClass.implements = function (iface) {
+ out += ']';
+
+ return out;
+ },
+ });
+
+ definePublicProperties(GObject.Object, {
+ implements(iface) {
if (iface.$gtype)
- return GObject.type_is_a(newClass.$gtype, iface.$gtype);
+ return GObject.type_is_a(this, iface.$gtype);
return false;
- };
+ },
+ });
+
+ definePrivateProperties(GObject.Object, {
+ [_registerType]() {
+ let klass = this;
+
+ let gtypename = _createGTypeName(klass);
+ let gflags = klass.hasOwnProperty(GTypeFlags) ? klass[GTypeFlags] : 0;
+ let gobjectInterfaces = klass.hasOwnProperty(interfaces) ? klass[interfaces] : [];
+ let propertiesArray = _propertiesAsArray(klass);
+ let parent = Object.getPrototypeOf(klass);
+ let gobjectSignals = klass.hasOwnProperty(signals) ? klass[signals] : [];
+
+ // Default to the GObject-specific prototype, fallback on the JS prototype for GI native classes.
+ const parentPrototype = parent.prototype[Gi.gobject_prototype_symbol] ?? parent.prototype;
+
+ const [giPrototype, registeredType] = Gi.register_type_with_class(
+ klass,
+ parentPrototype,
+ gtypename,
+ gflags,
+ gobjectInterfaces,
+ propertiesArray
+ );
+
+ _defineGType(klass, giPrototype, registeredType);
+ _createSignals(klass.$gtype, gobjectSignals);
+
+ // Reverse the interface array to give the last required interface precedence over the first.
+ const requiredInterfaces = [...gobjectInterfaces].reverse();
+ requiredInterfaces.forEach(iface =>
+ _copyInterfacePrototypeDescriptors(klass.prototype, iface.prototype));
+
+ _hookupVFuncs(klass.prototype, klass.prototype[Gi.gobject_prototype_symbol], klass.$gtype);
+
+ gobjectInterfaces.forEach(iface =>
+ _checkInterface(iface, klass.prototype));
+
+ // Lang.Class parent classes don't support static inheritance
+ if (!('implements' in klass))
+ klass.implements = GObject.Object.implements;
+ },
+ });
+
+ GObject.Object._classInit = function (klass) {
+ _checkProperties(klass);
+
+ if (_registerType in klass)
+ klass[_registerType]();
+ else
+ _resolveLegacyClassFunction(klass, _registerType).call(klass);
- return newClass;
+ return klass;
};
- GObject.Interface._classInit = function (klass) {
- let gtypename = _createGTypeName(klass);
- let gobjectInterfaces = klass.hasOwnProperty(requires) ? klass[requires] : [];
- let props = _propertiesAsArray(klass);
- let gobjectSignals = klass.hasOwnProperty(signals) ? klass[signals] : [];
+ function interfaceInstanceOf(instance) {
+ if (GObject.Interface.prototype.isPrototypeOf(this.prototype))
+ return GObject.type_is_a(instance, this);
- let newInterface = Gi.register_interface(gtypename, gobjectInterfaces,
- props);
- _createSignals(newInterface.$gtype, gobjectSignals);
+ return false;
+ }
- _copyAllDescriptors(newInterface, klass);
+ definePrivateProperties(GObject.Interface, {
+ [_registerType]() {
+ let klass = this;
- Object.getOwnPropertyNames(klass.prototype)
- .filter(key => key !== 'constructor')
- .concat(Object.getOwnPropertySymbols(klass.prototype))
- .forEach(key => {
- let descr = Object.getOwnPropertyDescriptor(klass.prototype, key);
+ let gtypename = _createGTypeName(klass);
+ let gobjectInterfaces = klass.hasOwnProperty(requires) ? klass[requires] : [];
+ let props = _propertiesAsArray(klass);
+ let gobjectSignals = klass.hasOwnProperty(signals) ? klass[signals] : [];
- // Create wrappers on the interface object so that generics work (e.g.
- // SomeInterface.some_function(this, blah) instead of
- // SomeInterface.prototype.some_function.call(this, blah)
- if (typeof descr.value === 'function') {
- let interfaceProto = klass.prototype; // capture in closure
- newInterface[key] = function (thisObj, ...args) {
- return interfaceProto[key].call(thisObj, ...args);
- };
- }
+ const [giPrototype, registeredType] = Gi.register_interface_with_class(klass, gtypename,
gobjectInterfaces,
+ props);
- Object.defineProperty(newInterface.prototype, key, descr);
- });
+ _defineGType(klass, giPrototype, registeredType);
+ _createSignals(klass.$gtype, gobjectSignals);
+
+ Object.defineProperty(klass, Symbol.hasInstance, {
+ value: interfaceInstanceOf,
+ });
+
+ return klass;
+ },
+ });
+
+ GObject.Interface._classInit = function (klass) {
+ if (_registerType in klass)
+ klass[_registerType]();
+ else
+ _resolveLegacyClassFunction(klass, _registerType).call(klass);
+
+ _createInterfaceGenerics(klass);
- return newInterface;
+ return klass;
};
/**
diff --git a/modules/core/overrides/Gtk.js b/modules/core/overrides/Gtk.js
index 77649a73..1f123539 100644
--- a/modules/core/overrides/Gtk.js
+++ b/modules/core/overrides/Gtk.js
@@ -4,10 +4,25 @@
const Legacy = imports._legacy;
const {Gio, GjsPrivate, GObject} = imports.gi;
+const {_registerType, definePrivateProperties} = imports._common;
let Gtk;
let BuilderScope;
+function defineChildren(instance, constructor, target = instance) {
+ let children = constructor[Gtk.children] || [];
+ for (let child of children) {
+ target[child.replace(/-/g, '_')] =
+ instance.get_template_child(constructor, child);
+ }
+
+ let internalChildren = constructor[Gtk.internalChildren] || [];
+ for (let child of internalChildren) {
+ target[`_${child.replace(/-/g, '_')}`] =
+ instance.get_template_child(constructor, child);
+ }
+}
+
function _init() {
Gtk = this;
@@ -46,70 +61,64 @@ function _init() {
wrapper = GObject.Object.prototype._init.call(wrapper, params) ?? wrapper;
- if (wrapper.constructor[Gtk.template]) {
- let children = wrapper.constructor[Gtk.children] || [];
- for (let child of children) {
- wrapper[child.replace(/-/g, '_')] =
- wrapper.get_template_child(wrapper.constructor, child);
- }
-
- let internalChildren = wrapper.constructor[Gtk.internalChildren] || [];
- for (let child of internalChildren) {
- wrapper[`_${child.replace(/-/g, '_')}`] =
- wrapper.get_template_child(wrapper.constructor, child);
- }
- }
+ if (wrapper.constructor[Gtk.template])
+ defineChildren(this, wrapper.constructor);
return wrapper;
};
Gtk.Widget._classInit = function (klass) {
- let template = klass[Gtk.template];
- let cssName = klass[Gtk.cssName];
- let children = klass[Gtk.children];
- let internalChildren = klass[Gtk.internalChildren];
-
- if (template) {
- klass.prototype._instance_init = function () {
- this.init_template();
- };
- }
+ return GObject.Object._classInit(klass);
+ };
- klass = GObject.Object._classInit(klass);
+ definePrivateProperties(Gtk.Widget, {
+ [_registerType]() {
+ let klass = this;
- if (cssName)
- Gtk.Widget.set_css_name.call(klass, cssName);
+ let template = klass[Gtk.template];
+ let cssName = klass[Gtk.cssName];
+ let children = klass[Gtk.children];
+ let internalChildren = klass[Gtk.internalChildren];
- if (template) {
- if (typeof template === 'string') {
- if (template.startsWith('resource:///')) {
- Gtk.Widget.set_template_from_resource.call(klass,
- template.slice(11));
- } else if (template.startsWith('file:///')) {
- let file = Gio.File.new_for_uri(template);
- let [, contents] = file.load_contents(null);
- Gtk.Widget.set_template.call(klass, contents);
- }
- } else {
- Gtk.Widget.set_template.call(klass, template);
- }
+ GObject.Object[_registerType].call(klass);
- if (BuilderScope)
- Gtk.Widget.set_template_scope.call(klass, new BuilderScope());
- }
+ if (template) {
+ klass.prototype._instance_init = function () {
+ this.init_template();
+ };
+ }
+ if (cssName)
+ Gtk.Widget.set_css_name.call(klass, cssName);
+
+ if (template) {
+ if (typeof template === 'string') {
+ if (template.startsWith('resource:///')) {
+ Gtk.Widget.set_template_from_resource.call(klass,
+ template.slice(11));
+ } else if (template.startsWith('file:///')) {
+ let file = Gio.File.new_for_uri(template);
+ let [, contents] = file.load_contents(null);
+ Gtk.Widget.set_template.call(klass, contents);
+ }
+ } else {
+ Gtk.Widget.set_template.call(klass, template);
+ }
- if (children) {
- children.forEach(child =>
- Gtk.Widget.bind_template_child_full.call(klass, child, false, 0));
- }
+ if (BuilderScope)
+ Gtk.Widget.set_template_scope.call(klass, new BuilderScope());
+ }
- if (internalChildren) {
- internalChildren.forEach(child =>
- Gtk.Widget.bind_template_child_full.call(klass, child, true, 0));
- }
+ if (children) {
+ children.forEach(child =>
+ Gtk.Widget.bind_template_child_full.call(klass, child, false, 0));
+ }
- return klass;
- };
+ if (internalChildren) {
+ internalChildren.forEach(child =>
+ Gtk.Widget.bind_template_child_full.call(klass, child, true, 0));
+ }
+ },
+ });
if (Gtk.Widget.prototype.get_first_child) {
Gtk.Widget.prototype[Symbol.iterator] = function* () {
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