DevTools: introduce View: a named widget with the toolbar.

third_party/WebKit/Source/devtools/front_end/ui/ThrottledWidget.js

-// Copyright 2014 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-/**
- * @constructor
- * @extends {WebInspector.Widget}
- * @param {boolean=} isWebComponent
- */
-WebInspector.ThrottledWidget = function(isWebComponent)
-{
-    WebInspector.Widget.call(this, isWebComponent);
-    this._updateThrottler = new WebInspector.Throttler(100);
-    this._updateWhenVisible = false;
-}
-
-WebInspector.ThrottledWidget.prototype = {
-    /**
-     * @protected
-     * @return {!Promise.<?>}
-     */
-    doUpdate: function()
-    {
-        return Promise.resolve();
-    },
-
-    update: function()
-    {
-        this._updateWhenVisible = !this.isShowing();
-        if (this._updateWhenVisible)
-            return;
-        this._updateThrottler.schedule(innerUpdate.bind(this));
-
-        /**
-         * @this {WebInspector.ThrottledWidget}
-         * @return {!Promise.<?>}
-         */
-        function innerUpdate()
-        {
-            if (this.isShowing()) {
-                return this.doUpdate();
-            } else {
-                this._updateWhenVisible = true;
-                return Promise.resolve();
-            }
-        }
-    },
-
-    /**
-     * @override
-     */
-    wasShown: function()
-    {
-        WebInspector.Widget.prototype.wasShown.call(this);
-        if (this._updateWhenVisible)
-            this.update();
-    },
-
-    __proto__: WebInspector.Widget.prototype
-}