diff --git a/src/ags.src.gresource.xml b/src/ags.src.gresource.xml
index 4064319..188e5d1 100644
--- a/src/ags.src.gresource.xml
+++ b/src/ags.src.gresource.xml
@@ -1,13 +1,15 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <gresources>
   <gresource prefix="/com/github/Aylur/ags">
-    <file>main.js</file>
     <file>app.js</file>
     <file>client.js</file>
-    <file>utils.js</file>
-    <file>widget.js</file>
+    <file>main.js</file>
     <file>service.js</file>
+    <file>utils.js</file>
+    <file>variable.js</file>
+    <file>widget.js</file>
 
+    <file>widgets/constructor.js</file>
     <file>widgets/overrides.js</file>
     <file>widgets/box.js</file>
     <file>widgets/button.js</file>
@@ -21,7 +23,6 @@
     <file>widgets/progressbar.js</file>
     <file>widgets/revealer.js</file>
     <file>widgets/scrollable.js</file>
-    <file>widgets/shared.js</file>
     <file>widgets/slider.js</file>
     <file>widgets/stack.js</file>
     <file>widgets/window.js</file>
diff --git a/src/main.ts b/src/main.ts
index 42edd9f..3d357b1 100644
--- a/src/main.ts
+++ b/src/main.ts
@@ -4,6 +4,7 @@ import * as Utils from './utils.js';
 import App from './app.js';
 import client from './client.js';
 import Service from './service.js';
+import Variable from './variable.js';
 import Widget from './widget.js';
 
 const APP_BUS = (name: string) => 'com.github.Aylur.ags.' + name;
@@ -130,6 +131,7 @@ export function main(args: string[]) {
         Utils,
         Widget,
         Service,
+        Variable,
     };
 
     const bus = APP_BUS(flags.busName);
diff --git a/src/utils.ts b/src/utils.ts
index 2a97ea0..0b234a8 100644
--- a/src/utils.ts
+++ b/src/utils.ts
@@ -2,7 +2,7 @@ import Gtk from 'gi://Gtk?version=3.0';
 import Gio from 'gi://Gio';
 import GLib from 'gi://GLib';
 import GObject from 'gi://GObject';
-import { Command } from './widgets/shared.js';
+import { Command } from './widgets/constructor.js';
 
 export const USER = GLib.get_user_name();
 export const CACHE_DIR = `${GLib.get_user_cache_dir()}/${pkg.name}`;
@@ -113,15 +113,16 @@ export function connect(
 
 export function interval(
     interval: number,
-    callback: () => void, widget: Gtk.Widget,
+    callback: () => void,
+    bind?: Gtk.Widget,
 ) {
     callback();
     const id = GLib.timeout_add(GLib.PRIORITY_DEFAULT, interval, () => {
         callback();
         return true;
     });
-    if (widget)
-        widget.connect('destroy', () => GLib.source_remove(id));
+    if (bind)
+        bind.connect('destroy', () => GLib.source_remove(id));
 
     return id;
 }
@@ -211,6 +212,7 @@ export function subprocess(
     cmd: string | string[],
     callback: (out: string) => void,
     onError = logError,
+    bind?: Gtk.Widget,
 ) {
     try {
         const read = (stdout: Gio.DataInputStream) => {
@@ -245,6 +247,10 @@ export function subprocess(
         });
 
         read(stdout);
+
+        if (bind)
+            bind.connect('destroy', () => proc.force_exit());
+
         return proc;
     } catch (e) {
         onError(e as Error);
diff --git a/src/variable.ts b/src/variable.ts
new file mode 100644
index 0000000..9ebd017
--- /dev/null
+++ b/src/variable.ts
@@ -0,0 +1,62 @@
+/* eslint-disable @typescript-eslint/no-explicit-any */
+import GObject from 'gi://GObject';
+import Gio from 'gi://Gio';
+import GLib from 'gi://GLib';
+import { execAsync, interval, subprocess } from './utils.js';
+
+interface Options {
+    poll?: [interval: number, cmd: string[] | string | (() => unknown)],
+    listen?: string[] | string,
+}
+
+class AgsVariable extends GObject.Object {
+    static {
+        GObject.registerClass({
+            GTypeName: 'AgsVariable',
+            Signals: { 'changed': {} },
+        }, this);
+    }
+
+    _inerval?: number;
+    _subprocess?: Gio.Subprocess | null;
+
+    constructor(value: any, option: Options) {
+        super();
+        this.value = value;
+
+        if (option.poll) {
+            const [time, cmd] = option.poll;
+            if (Array.isArray(cmd) || typeof cmd === 'string') {
+                this._inerval = interval(time, () => execAsync(cmd)
+                    .catch(logError)
+                    .then(this.setValue.bind(this)));
+            }
+            if (typeof cmd === 'function')
+                this._inerval = interval(time, () => this.setValue(cmd()));
+        }
+
+        if (option.listen)
+            this._subprocess = subprocess(option.listen, this.setValue.bind(this), logError);
+    }
+
+    dispose() {
+        if (this._inerval)
+            GLib.source_remove(this._inerval);
+
+        this._subprocess?.force_exit();
+        this.run_dispose();
+    }
+
+    private _value: any;
+
+    getValue() { return this._value; }
+    setValue(value: any) {
+        this._value = value;
+        this.emit('changed');
+    }
+
+    get value() { return this._value; }
+    set value(value: any) { this.setValue(value); }
+}
+
+export default (value: any, options: Options) => new AgsVariable(value, options);
diff --git a/src/widget.ts b/src/widget.ts
index 10f7076..340e9e2 100644
--- a/src/widget.ts
+++ b/src/widget.ts
@@ -14,8 +14,7 @@ import AgsProgressBar from './widgets/progressbar.js';
 import AgsEntry from './widgets/entry.js';
 import { AgsMenu, AgsMenuItem } from './widgets/menu.js';
 import AgsWindow from './widgets/window.js';
-import constructor from './widgets/shared.js';
-import { ctor } from './widgets/shared.js';
+import { constructor, type ctor } from './widgets/constructor.js';
 
 export default function Widget({ type, ...params }: { type: ctor }) {
     return constructor(type, params);
diff --git a/src/widgets/button.ts b/src/widgets/button.ts
index c900666..e048561 100644
--- a/src/widgets/button.ts
+++ b/src/widgets/button.ts
@@ -2,7 +2,7 @@ import GObject from 'gi://GObject';
 import Gtk from 'gi://Gtk?version=3.0';
 import Gdk from 'gi://Gdk?version=3.0';
 import { runCmd } from '../utils.js';
-import { Command } from './shared.js';
+import { Command } from './constructor.js';
 
 export default class AgsButton extends Gtk.Button {
     static {
diff --git a/src/widgets/shared.ts b/src/widgets/constructor.ts
similarity index 78%
rename from src/widgets/shared.ts
rename to src/widgets/constructor.ts
index 34dccff..9c8f6ea 100644
--- a/src/widgets/shared.ts
+++ b/src/widgets/constructor.ts
@@ -25,16 +25,17 @@ interface CommonParams {
         [number, (...args: unknown[]) => unknown] |
         [Connectable, (...args: unknown[]) => unknown, string]
     )[]
-    properties?: [string, unknown][]
+    properties?: [prop: string, value: unknown][]
+    binds?: [prop: string, obj: Connectable, objProp?: string, signal?: string][],
     setup?: (widget: Gtk.Widget) => void
 }
 
 function separateCommon({
-    className, style, halign, valign, connections, properties, setup,
+    className, style, halign, valign, connections, properties, binds, setup,
     ...rest
 }: CommonParams) {
     return [
-        { className, style, halign, valign, connections, properties, setup },
+        { className, style, halign, valign, connections, properties, binds, setup },
         rest,
     ];
 }
@@ -42,7 +43,7 @@ function separateCommon({
 function parseCommon(widget: Gtk.Widget, {
     className, style,
     halign, valign,
-    connections, properties, setup,
+    connections = [], properties, binds, setup,
 }: CommonParams) {
     if (className !== undefined)
         // @ts-expect-error
@@ -84,8 +85,28 @@ function parseCommon(widget: Gtk.Widget, {
         });
     }
 
+    if (binds) {
+        binds.forEach(([prop, obj, value = 'value', signal = 'changed']) => {
+            if (!prop || !obj) {
+                logError(new Error('missing arguments to connections'));
+                return;
+            }
+
+            const callback = () => {
+                // @ts-expect-error
+                widget[prop] = obj[value];
+            };
+            connections.push([obj, callback, signal]);
+        });
+    }
+
     if (connections) {
         connections.forEach(([s, callback, event]) => {
+            if (!s || !callback) {
+                logError(new Error('missing arguments to connections'));
+                return;
+            }
+
             if (typeof s === 'string')
                 widget.connect(s, callback);
 
@@ -112,7 +133,7 @@ function parseCommon(widget: Gtk.Widget, {
 
 // eslint-disable-next-line @typescript-eslint/no-explicit-any
 export type ctor = { new(...args: any[]): Gtk.Widget }
-export default function constructor(
+export function constructor(
     ctor: ctor,
     params: CommonParams | string = {},
 ) {
diff --git a/src/widgets/entry.ts b/src/widgets/entry.ts
index b1f4554..59752eb 100644
--- a/src/widgets/entry.ts
+++ b/src/widgets/entry.ts
@@ -1,7 +1,7 @@
 import GObject from 'gi://GObject';
 import Gtk from 'gi://Gtk?version=3.0';
 import { runCmd } from '../utils.js';
-import { Command } from './shared.js';
+import { Command } from './constructor.js';
 
 export default class AgsEntry extends Gtk.Entry {
     static {
diff --git a/src/widgets/eventbox.ts b/src/widgets/eventbox.ts
index 33a084f..17c1a11 100644
--- a/src/widgets/eventbox.ts
+++ b/src/widgets/eventbox.ts
@@ -2,7 +2,7 @@ import GObject from 'gi://GObject';
 import Gtk from 'gi://Gtk?version=3.0';
 import Gdk from 'gi://Gdk?version=3.0';
 import { runCmd } from '../utils.js';
-import { Command } from './shared.js';
+import { Command } from './constructor.js';
 
 export default class AgsEventBox extends Gtk.EventBox {
     static {
diff --git a/src/widgets/menu.ts b/src/widgets/menu.ts
index 1919e14..b7ff65e 100644
--- a/src/widgets/menu.ts
+++ b/src/widgets/menu.ts
@@ -1,7 +1,7 @@
 import GObject from 'gi://GObject';
 import Gtk from 'gi://Gtk?version=3.0';
 import { runCmd } from '../utils.js';
-import { Command } from './shared.js';
+import { Command } from './constructor.js';
 
 interface Params {
     children?: Gtk.Widget[]
diff --git a/src/widgets/slider.ts b/src/widgets/slider.ts
index f902b01..e7056a4 100644
--- a/src/widgets/slider.ts
+++ b/src/widgets/slider.ts
@@ -2,7 +2,7 @@ import GObject from 'gi://GObject';
 import Gtk from 'gi://Gtk?version=3.0';
 import { runCmd } from '../utils.js';
 import { EventButton, EventScroll, EventKey } from 'gi-types/gdk3';
-import { Command } from './shared.js';
+import { Command } from './constructor.js';
 
 interface Params {
     onChange?: Command