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diff --git a/addon-sdk/source/lib/sdk/ui/state.js b/addon-sdk/source/lib/sdk/ui/state.js
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+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+'use strict';
+
+// The Button module currently supports only Firefox.
+// See: https://bugzilla.mozilla.org/show_bug.cgi?id=jetpack-panel-apps
+module.metadata = {
+ 'stability': 'experimental',
+ 'engines': {
+ 'Firefox': '*',
+ 'SeaMonkey': '*',
+ 'Thunderbird': '*'
+ }
+};
+
+const { Ci } = require('chrome');
+
+const events = require('../event/utils');
+const { events: browserEvents } = require('../browser/events');
+const { events: tabEvents } = require('../tab/events');
+const { events: stateEvents } = require('./state/events');
+
+const { windows, isInteractive, getFocusedBrowser } = require('../window/utils');
+const { getActiveTab, getOwnerWindow } = require('../tabs/utils');
+
+const { ignoreWindow } = require('../private-browsing/utils');
+
+const { freeze } = Object;
+const { merge } = require('../util/object');
+const { on, off, emit } = require('../event/core');
+
+const { add, remove, has, clear, iterator } = require('../lang/weak-set');
+const { isNil } = require('../lang/type');
+
+const { viewFor } = require('../view/core');
+
+const components = new WeakMap();
+
+const ERR_UNREGISTERED = 'The state cannot be set or get. ' +
+ 'The object may be not be registered, or may already have been unloaded.';
+
+const ERR_INVALID_TARGET = 'The state cannot be set or get for this target.' +
+ 'Only window, tab and registered component are valid targets.';
+
+const isWindow = thing => thing instanceof Ci.nsIDOMWindow;
+const isTab = thing => thing.tagName && thing.tagName.toLowerCase() === 'tab';
+const isActiveTab = thing => isTab(thing) && thing === getActiveTab(getOwnerWindow(thing));
+const isEnumerable = window => !ignoreWindow(window);
+const browsers = _ =>
+ windows('navigator:browser', { includePrivate: true }).filter(isInteractive);
+const getMostRecentTab = _ => getActiveTab(getFocusedBrowser());
+
+function getStateFor(component, target) {
+ if (!isRegistered(component))
+ throw new Error(ERR_UNREGISTERED);
+
+ if (!components.has(component))
+ return null;
+
+ let states = components.get(component);
+
+ if (target) {
+ if (isTab(target) || isWindow(target) || target === component)
+ return states.get(target) || null;
+ else
+ throw new Error(ERR_INVALID_TARGET);
+ }
+
+ return null;
+}
+exports.getStateFor = getStateFor;
+
+function getDerivedStateFor(component, target) {
+ if (!isRegistered(component))
+ throw new Error(ERR_UNREGISTERED);
+
+ if (!components.has(component))
+ return null;
+
+ let states = components.get(component);
+
+ let componentState = states.get(component);
+ let windowState = null;
+ let tabState = null;
+
+ if (target) {
+ // has a target
+ if (isTab(target)) {
+ windowState = states.get(getOwnerWindow(target), null);
+
+ if (states.has(target)) {
+ // we have a tab state
+ tabState = states.get(target);
+ }
+ }
+ else if (isWindow(target) && states.has(target)) {
+ // we have a window state
+ windowState = states.get(target);
+ }
+ }
+
+ return freeze(merge({}, componentState, windowState, tabState));
+}
+exports.getDerivedStateFor = getDerivedStateFor;
+
+function setStateFor(component, target, state) {
+ if (!isRegistered(component))
+ throw new Error(ERR_UNREGISTERED);
+
+ let isComponentState = target === component;
+ let targetWindows = isWindow(target) ? [target] :
+ isActiveTab(target) ? [getOwnerWindow(target)] :
+ isComponentState ? browsers() :
+ isTab(target) ? [] :
+ null;
+
+ if (!targetWindows)
+ throw new Error(ERR_INVALID_TARGET);
+
+ // initialize the state's map
+ if (!components.has(component))
+ components.set(component, new WeakMap());
+
+ let states = components.get(component);
+
+ if (state === null && !isComponentState) // component state can't be deleted
+ states.delete(target);
+ else {
+ let base = isComponentState ? states.get(target) : null;
+ states.set(target, freeze(merge({}, base, state)));
+ }
+
+ render(component, targetWindows);
+}
+exports.setStateFor = setStateFor;
+
+function render(component, targetWindows) {
+ targetWindows = targetWindows ? [].concat(targetWindows) : browsers();
+
+ for (let window of targetWindows.filter(isEnumerable)) {
+ let tabState = getDerivedStateFor(component, getActiveTab(window));
+
+ emit(stateEvents, 'data', {
+ type: 'render',
+ target: component,
+ window: window,
+ state: tabState
+ });
+
+ }
+}
+exports.render = render;
+
+function properties(contract) {
+ let { rules } = contract;
+ let descriptor = Object.keys(rules).reduce(function(descriptor, name) {
+ descriptor[name] = {
+ get: function() { return getDerivedStateFor(this)[name] },
+ set: function(value) {
+ let changed = {};
+ changed[name] = value;
+
+ setStateFor(this, this, contract(changed));
+ }
+ }
+ return descriptor;
+ }, {});
+
+ return Object.create(Object.prototype, descriptor);
+}
+exports.properties = properties;
+
+function state(contract) {
+ return {
+ state: function state(target, state) {
+ let nativeTarget = target === 'window' ? getFocusedBrowser()
+ : target === 'tab' ? getMostRecentTab()
+ : target === this ? null
+ : viewFor(target);
+
+ if (!nativeTarget && target !== this && !isNil(target))
+ throw new Error(ERR_INVALID_TARGET);
+
+ target = nativeTarget || target;
+
+ // jquery style
+ return arguments.length < 2
+ ? getDerivedStateFor(this, target)
+ : setStateFor(this, target, contract(state))
+ }
+ }
+}
+exports.state = state;
+
+const register = (component, state) => {
+ add(components, component);
+ setStateFor(component, component, state);
+}
+exports.register = register;
+
+const unregister = component => {
+ remove(components, component);
+}
+exports.unregister = unregister;
+
+const isRegistered = component => has(components, component);
+exports.isRegistered = isRegistered;
+
+var tabSelect = events.filter(tabEvents, e => e.type === 'TabSelect');
+var tabClose = events.filter(tabEvents, e => e.type === 'TabClose');
+var windowOpen = events.filter(browserEvents, e => e.type === 'load');
+var windowClose = events.filter(browserEvents, e => e.type === 'close');
+
+var close = events.merge([tabClose, windowClose]);
+var activate = events.merge([windowOpen, tabSelect]);
+
+on(activate, 'data', ({target}) => {
+ let [window, tab] = isWindow(target)
+ ? [target, getActiveTab(target)]
+ : [getOwnerWindow(target), target];
+
+ if (ignoreWindow(window)) return;
+
+ for (let component of iterator(components)) {
+ emit(stateEvents, 'data', {
+ type: 'render',
+ target: component,
+ window: window,
+ state: getDerivedStateFor(component, tab)
+ });
+ }
+});
+
+on(close, 'data', function({target}) {
+ for (let component of iterator(components)) {
+ components.get(component).delete(target);
+ }
+});