Bug 1309194: Implement summary info in Net Panel Toolbar; Bug 1317205: CSS improvement for summary button

Required for: https://github.com/MoonchildProductions/moebius/pull/93

20 files changed, 305 insertions, 238 deletions

diff --git a/devtools/client/netmonitor/actions/index.js b/devtools/client/netmonitor/actions/index.js
index 3f7b0bd2f..2ce23448e 100644
--- a/devtools/client/netmonitor/actions/index.js
+++ b/devtools/client/netmonitor/actions/index.js
@@ -4,6 +4,7 @@
 "use strict";
 
 const filters = require("./filters");
-const sidebar = require("./sidebar");
+const requests = require("./requests");
+const ui = require("./ui");
 
-module.exports = Object.assign({}, filters, sidebar);
+module.exports = Object.assign({}, filters, requests, ui);
diff --git a/devtools/client/netmonitor/actions/moz.build b/devtools/client/netmonitor/actions/moz.build
index 477cafb41..d0ac61944 100644
--- a/devtools/client/netmonitor/actions/moz.build
+++ b/devtools/client/netmonitor/actions/moz.build
@@ -6,5 +6,6 @@
 DevToolsModules(
     'filters.js',
     'index.js',
-    'sidebar.js',
+    'requests.js',
+    'ui.js',
 )
diff --git a/devtools/client/netmonitor/actions/requests.js b/devtools/client/netmonitor/actions/requests.js
new file mode 100644
index 000000000..ae794a437
--- /dev/null
+++ b/devtools/client/netmonitor/actions/requests.js
@@ -0,0 +1,25 @@
+/* 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";
+
+const {
+  UPDATE_REQUESTS,
+} = require("../constants");
+
+/**
+ * Update request items
+ *
+ * @param {array} requests - visible request items
+ */
+function updateRequests(items) {
+  return {
+    type: UPDATE_REQUESTS,
+    items,
+  };
+}
+
+module.exports = {
+  updateRequests,
+};
diff --git a/devtools/client/netmonitor/actions/sidebar.js b/devtools/client/netmonitor/actions/sidebar.js
deleted file mode 100644
index 7e8dca5c1..000000000
--- a/devtools/client/netmonitor/actions/sidebar.js
+++ /dev/null
@@ -1,49 +0,0 @@
-/* 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";
-
-const {
-  DISABLE_TOGGLE_BUTTON,
-  SHOW_SIDEBAR,
-  TOGGLE_SIDEBAR,
-} = require("../constants");
-
-/**
- * Change ToggleButton disabled state.
- *
- * @param {boolean} disabled - expected button disabled state
- */
-function disableToggleButton(disabled) {
-  return {
-    type: DISABLE_TOGGLE_BUTTON,
-    disabled: disabled,
-  };
-}
-
-/**
- * Change sidebar visible state.
- *
- * @param {boolean} visible - expected sidebar visible state
- */
-function showSidebar(visible) {
-  return {
-    type: SHOW_SIDEBAR,
-    visible: visible,
-  };
-}
-
-/**
- * Toggle to show/hide sidebar.
- */
-function toggleSidebar() {
-  return {
-    type: TOGGLE_SIDEBAR,
-  };
-}
-
-module.exports = {
-  disableToggleButton,
-  showSidebar,
-  toggleSidebar,
-};
diff --git a/devtools/client/netmonitor/actions/ui.js b/devtools/client/netmonitor/actions/ui.js
new file mode 100644
index 000000000..c6df307ed
--- /dev/null
+++ b/devtools/client/netmonitor/actions/ui.js
@@ -0,0 +1,36 @@
++/* 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";

+

+const {

+  OPEN_SIDEBAR,

+  TOGGLE_SIDEBAR,

+} = require("../constants");

+

+/**

+ * Change sidebar open state.

+ *

+ * @param {boolean} open - open state

+ */

+function openSidebar(open) {

+  return {

+    type: OPEN_SIDEBAR,

+    open,

+  };

+}

+

+/**

+ * Toggle sidebar open state.

+ */

+function toggleSidebar() {

+  return {

+    type: TOGGLE_SIDEBAR,

+  };

+}

+

+module.exports = {

+  openSidebar,

+  toggleSidebar,

+};

diff --git a/devtools/client/netmonitor/components/moz.build b/devtools/client/netmonitor/components/moz.build
index 47ef7f026..42459584d 100644
--- a/devtools/client/netmonitor/components/moz.build
+++ b/devtools/client/netmonitor/components/moz.build
@@ -6,5 +6,6 @@
 DevToolsModules(
     'filter-buttons.js',
     'search-box.js',
+    'summary-button.js',
     'toggle-button.js',
 )
diff --git a/devtools/client/netmonitor/components/summary-button.js b/devtools/client/netmonitor/components/summary-button.js
new file mode 100644
index 000000000..9465d3147
--- /dev/null
+++ b/devtools/client/netmonitor/components/summary-button.js
@@ -0,0 +1,57 @@
+/* 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/. */
+
+/* globals NetMonitorView */
+
+"use strict";
+
+const {
+  CONTENT_SIZE_DECIMALS,
+  REQUEST_TIME_DECIMALS,
+} = require("../constants");
+const { DOM, PropTypes } = require("devtools/client/shared/vendor/react");
+const { connect } = require("devtools/client/shared/vendor/react-redux");
+const { PluralForm } = require("devtools/shared/plural-form");
+const { L10N } = require("../l10n");
+const { getSummary } = require("../selectors/index");
+
+const { button, span } = DOM;
+
+function SummaryButton({
+  summary,
+  triggerSummary,
+}) {
+  let { count, totalBytes, totalMillis } = summary;
+  const text = (count === 0) ? L10N.getStr("networkMenu.empty") :
+    PluralForm.get(count, L10N.getStr("networkMenu.summary"))
+    .replace("#1", count)
+    .replace("#2", L10N.numberWithDecimals(totalBytes / 1024,
+      CONTENT_SIZE_DECIMALS))
+    .replace("#3", L10N.numberWithDecimals(totalMillis / 1000,
+      REQUEST_TIME_DECIMALS));
+
+  return button({
+    id: "requests-menu-network-summary-button",
+    className: "devtools-button",
+    title: count ? text : L10N.getStr("netmonitor.toolbar.perf"),
+    onClick: triggerSummary,
+  },
+  span({ className: "summary-info-icon" }),
+  span({ className: "summary-info-text" }, text));
+}
+
+SummaryButton.propTypes = {
+  summary: PropTypes.object.isRequired,
+};
+
+module.exports = connect(
+  (state) => ({
+    summary: getSummary(state),
+  }),
+  (dispatch) => ({
+    triggerSummary: () => {
+      NetMonitorView.toggleFrontendMode();
+    },
+  })
+)(SummaryButton);
diff --git a/devtools/client/netmonitor/components/toggle-button.js b/devtools/client/netmonitor/components/toggle-button.js
index db546c55d..c9a59a76b 100644
--- a/devtools/client/netmonitor/components/toggle-button.js
+++ b/devtools/client/netmonitor/components/toggle-button.js
@@ -1,5 +1,3 @@
-/* -*- indent-tabs-mode: nil; js-indent-level: 2 -*- */
-/* vim: set ft=javascript ts=2 et sw=2 tw=80: */
 /* 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/. */
@@ -11,47 +9,43 @@ const { connect } = require("devtools/client/shared/vendor/react-redux");
 const { L10N } = require("../l10n");
 const Actions = require("../actions/index");
 
-// Shortcuts
 const { button } = DOM;
 
-/**
- * Button used to toggle sidebar
- */
 function ToggleButton({
   disabled,
-  onToggle,
-  visible,
+  open,
+  triggerSidebar,
 }) {
   let className = ["devtools-button"];
-  if (!visible) {
+  if (!open) {
     className.push("pane-collapsed");
   }
-  let titleMsg = visible ? L10N.getStr("collapseDetailsPane") :
-                           L10N.getStr("expandDetailsPane");
+
+  const title = open ? L10N.getStr("collapseDetailsPane") :
+                       L10N.getStr("expandDetailsPane");
 
   return button({
     id: "details-pane-toggle",
     className: className.join(" "),
-    title: titleMsg,
-    disabled: disabled,
+    title,
+    disabled,
     tabIndex: "0",
-    onMouseDown: onToggle,
+    onMouseDown: triggerSidebar,
   });
 }
 
 ToggleButton.propTypes = {
   disabled: PropTypes.bool.isRequired,
-  onToggle: PropTypes.func.isRequired,
-  visible: PropTypes.bool.isRequired,
+  triggerSidebar: PropTypes.func.isRequired,
 };
 
 module.exports = connect(
   (state) => ({
-    disabled: state.sidebar.toggleButtonDisabled,
-    visible: state.sidebar.visible,
+    disabled: state.requests.items.length === 0,
+    open: state.ui.sidebar.open,
   }),
   (dispatch) => ({
-    onToggle: () => {
+    triggerSidebar: () => {
       dispatch(Actions.toggleSidebar());
 
       let requestsMenu = NetMonitorView.RequestsMenu;
diff --git a/devtools/client/netmonitor/constants.js b/devtools/client/netmonitor/constants.js
index a540d74b2..33bc71ea7 100644
--- a/devtools/client/netmonitor/constants.js
+++ b/devtools/client/netmonitor/constants.js
@@ -5,15 +5,17 @@
 
 const general = {
   FREETEXT_FILTER_SEARCH_DELAY: 200,
+  CONTENT_SIZE_DECIMALS: 2,
+  REQUEST_TIME_DECIMALS: 2,
 };
 
 const actionTypes = {
   TOGGLE_FILTER_TYPE: "TOGGLE_FILTER_TYPE",
   ENABLE_FILTER_TYPE_ONLY: "ENABLE_FILTER_TYPE_ONLY",
-  TOGGLE_SIDEBAR: "TOGGLE_SIDEBAR",
-  SHOW_SIDEBAR: "SHOW_SIDEBAR",
-  DISABLE_TOGGLE_BUTTON: "DISABLE_TOGGLE_BUTTON",
   SET_FILTER_TEXT: "SET_FILTER_TEXT",
+  OPEN_SIDEBAR: "OPEN_SIDEBAR",
+  TOGGLE_SIDEBAR: "TOGGLE_SIDEBAR",
+  UPDATE_REQUESTS: "UPDATE_REQUESTS",
 };
 
 module.exports = Object.assign({}, general, actionTypes);
diff --git a/devtools/client/netmonitor/netmonitor-view.js b/devtools/client/netmonitor/netmonitor-view.js
index 68470f7a9..8da5a2038 100644
--- a/devtools/client/netmonitor/netmonitor-view.js
+++ b/devtools/client/netmonitor/netmonitor-view.js
@@ -125,7 +125,6 @@ var NetMonitorView = {
     if (!Prefs.statistics) {
       $("#request-menu-context-perf").hidden = true;
       $("#notice-perf-message").hidden = true;
-      $("#requests-menu-network-summary-button").hidden = true;
     }
   },
 
@@ -171,10 +170,10 @@ var NetMonitorView = {
 
     if (flags.visible) {
       this._body.classList.remove("pane-collapsed");
-      gStore.dispatch(Actions.showSidebar(true));
+      gStore.dispatch(Actions.openSidebar(true));
     } else {
       this._body.classList.add("pane-collapsed");
-      gStore.dispatch(Actions.showSidebar(false));
+      gStore.dispatch(Actions.openSidebar(false));
     }
 
     if (tabIndex !== undefined) {
diff --git a/devtools/client/netmonitor/netmonitor.xul b/devtools/client/netmonitor/netmonitor.xul
index bb580f7ad..8a0c60389 100644
--- a/devtools/client/netmonitor/netmonitor.xul
+++ b/devtools/client/netmonitor/netmonitor.xul
@@ -28,9 +28,8 @@
                   id="react-filter-buttons-hook"/>
         <spacer id="requests-menu-spacer"
                 flex="1"/>
-        <toolbarbutton id="requests-menu-network-summary-button"
-                       class="devtools-toolbarbutton icon-and-text"
-                       data-localization="tooltiptext=netmonitor.toolbar.perf"/>
+        <html:div xmlns="http://www.w3.org/1999/xhtml"
+                  id="react-summary-button-hook"/>
         <html:div xmlns="http://www.w3.org/1999/xhtml"
                   id="react-search-box-hook"/>
         <html:div xmlns="http://www.w3.org/1999/xhtml"
diff --git a/devtools/client/netmonitor/reducers/index.js b/devtools/client/netmonitor/reducers/index.js
index 58638a030..f36b1d91f 100644
--- a/devtools/client/netmonitor/reducers/index.js
+++ b/devtools/client/netmonitor/reducers/index.js
@@ -5,9 +5,11 @@
 
 const { combineReducers } = require("devtools/client/shared/vendor/redux");
 const filters = require("./filters");
-const sidebar = require("./sidebar");
+const requests = require("./requests");
+const ui = require("./ui");
 
 module.exports = combineReducers({
   filters,
-  sidebar,
+  requests,
+  ui,
 });
diff --git a/devtools/client/netmonitor/reducers/moz.build b/devtools/client/netmonitor/reducers/moz.build
index 477cafb41..d0ac61944 100644
--- a/devtools/client/netmonitor/reducers/moz.build
+++ b/devtools/client/netmonitor/reducers/moz.build
@@ -6,5 +6,6 @@
 DevToolsModules(
     'filters.js',
     'index.js',
-    'sidebar.js',
+    'requests.js',
+    'ui.js',
 )
diff --git a/devtools/client/netmonitor/reducers/requests.js b/devtools/client/netmonitor/reducers/requests.js
new file mode 100644
index 000000000..9ba888cad
--- /dev/null
+++ b/devtools/client/netmonitor/reducers/requests.js
@@ -0,0 +1,28 @@
+/* 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";
+
+const I = require("devtools/client/shared/vendor/immutable");
+const {
+  UPDATE_REQUESTS,
+} = require("../constants");
+
+const Requests = I.Record({
+  items: [],
+});
+
+function updateRequests(state, action) {
+  return state.set("items", action.items || state.items);
+}
+
+function requests(state = new Requests(), action) {
+  switch (action.type) {
+    case UPDATE_REQUESTS:
+      return updateRequests(state, action);
+    default:
+      return state;
+  }
+}
+
+module.exports = requests;
diff --git a/devtools/client/netmonitor/reducers/sidebar.js b/devtools/client/netmonitor/reducers/sidebar.js
deleted file mode 100644
index eaa8b63df..000000000
--- a/devtools/client/netmonitor/reducers/sidebar.js
+++ /dev/null
@@ -1,43 +0,0 @@
-/* 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";
-
-const I = require("devtools/client/shared/vendor/immutable");
-const {
-  DISABLE_TOGGLE_BUTTON,
-  SHOW_SIDEBAR,
-  TOGGLE_SIDEBAR,
-} = require("../constants");
-
-const SidebarState = I.Record({
-  toggleButtonDisabled: true,
-  visible: false,
-});
-
-function disableToggleButton(state, action) {
-  return state.set("toggleButtonDisabled", action.disabled);
-}
-
-function showSidebar(state, action) {
-  return state.set("visible", action.visible);
-}
-
-function toggleSidebar(state, action) {
-  return state.set("visible", !state.visible);
-}
-
-function sidebar(state = new SidebarState(), action) {
-  switch (action.type) {
-    case DISABLE_TOGGLE_BUTTON:
-      return disableToggleButton(state, action);
-    case SHOW_SIDEBAR:
-      return showSidebar(state, action);
-    case TOGGLE_SIDEBAR:
-      return toggleSidebar(state, action);
-    default:
-      return state;
-  }
-}
-
-module.exports = sidebar;
diff --git a/devtools/client/netmonitor/reducers/ui.js b/devtools/client/netmonitor/reducers/ui.js
new file mode 100644
index 000000000..033b944f3
--- /dev/null
+++ b/devtools/client/netmonitor/reducers/ui.js
@@ -0,0 +1,40 @@
+/* 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";
+
+const I = require("devtools/client/shared/vendor/immutable");
+const {
+  OPEN_SIDEBAR,
+  TOGGLE_SIDEBAR,
+} = require("../constants");
+
+const Sidebar = I.Record({
+  open: false,
+});
+
+const UI = I.Record({
+  sidebar: new Sidebar(),
+});
+
+function openSidebar(state, action) {
+  return state.setIn(["sidebar", "open"], action.open);
+}
+
+function toggleSidebar(state, action) {
+  return state.setIn(["sidebar", "open"], !state.sidebar.open);
+}
+
+function ui(state = new UI(), action) {
+  switch (action.type) {
+    case OPEN_SIDEBAR:
+      return openSidebar(state, action);
+    case TOGGLE_SIDEBAR:
+      return toggleSidebar(state, action);
+    default:
+      return state;
+  }
+}
+
+module.exports = ui;
diff --git a/devtools/client/netmonitor/requests-menu-view.js b/devtools/client/netmonitor/requests-menu-view.js
index 6ea6381ec..d8c66b05d 100644
--- a/devtools/client/netmonitor/requests-menu-view.js
+++ b/devtools/client/netmonitor/requests-menu-view.js
@@ -19,7 +19,6 @@ const {setImageTooltip, getImageDimensions} =
 const {Heritage, WidgetMethods, setNamedTimeout} =
   require("devtools/client/shared/widgets/view-helpers");
 const {CurlUtils} = require("devtools/client/shared/curl");
-const {PluralForm} = require("devtools/shared/plural-form");
 const {Filters, isFreetextMatch} = require("./filter-predicates");
 const {Sorters} = require("./sort-predicates");
 const {L10N, WEBCONSOLE_L10N} = require("./l10n");
@@ -90,10 +89,11 @@ function storeWatcher(initialValue, reduceValue, onChange) {
   let currentValue = initialValue;
 
   return () => {
+    const oldValue = currentValue;
     const newValue = reduceValue(currentValue);
-    if (newValue !== currentValue) {
-      onChange(newValue, currentValue);
+    if (newValue !== oldValue) {
       currentValue = newValue;
+      onChange(newValue, oldValue);
     }
   };
 }
@@ -129,8 +129,6 @@ RequestsMenuView.prototype = Heritage.extend(WidgetMethods, {
     let widgetParentEl = $("#requests-menu-contents");
     this.widget = new SideMenuWidget(widgetParentEl);
     this._splitter = $("#network-inspector-view-splitter");
-    this._summary = $("#requests-menu-network-summary-button");
-    this._summary.setAttribute("label", L10N.getStr("networkMenu.empty"));
 
     // Create a tooltip for the newly appended network request item.
     this.tooltip = new HTMLTooltip(NetMonitorController._toolbox.doc, { type: "arrow" });
@@ -211,13 +209,10 @@ RequestsMenuView.prototype = Heritage.extend(WidgetMethods, {
     if (NetMonitorController.supportsPerfStats) {
       $("#requests-menu-perf-notice-button").addEventListener("command",
         this._onContextPerfCommand, false);
-      $("#requests-menu-network-summary-button").addEventListener("command",
-        this._onContextPerfCommand, false);
       $("#network-statistics-back-button").addEventListener("command",
         this._onContextPerfCommand, false);
     } else {
       $("#notice-perf-message").hidden = true;
-      $("#requests-menu-network-summary-button").hidden = true;
     }
 
     if (!NetMonitorController.supportsTransferredResponseSize) {
@@ -257,8 +252,6 @@ RequestsMenuView.prototype = Heritage.extend(WidgetMethods, {
       this._onReloadCommand, false);
     $("#requests-menu-perf-notice-button").removeEventListener("command",
       this._onContextPerfCommand, false);
-    $("#requests-menu-network-summary-button").removeEventListener("command",
-      this._onContextPerfCommand, false);
     $("#network-statistics-back-button").removeEventListener("command",
       this._onContextPerfCommand, false);
 
@@ -422,7 +415,7 @@ RequestsMenuView.prototype = Heritage.extend(WidgetMethods, {
    */
   reFilterRequests: function () {
     this.filterContents(this._filterPredicate);
-    this.refreshSummary();
+    this.updateRequests();
     this.refreshZebra();
   },
 
@@ -541,7 +534,7 @@ RequestsMenuView.prototype = Heritage.extend(WidgetMethods, {
         break;
     }
 
-    this.refreshSummary();
+    this.updateRequests();
     this.refreshZebra();
   },
 
@@ -552,41 +545,17 @@ RequestsMenuView.prototype = Heritage.extend(WidgetMethods, {
     NetMonitorController.NetworkEventsHandler.clearMarkers();
     NetMonitorView.Sidebar.toggle(false);
 
-    this.store.dispatch(Actions.disableToggleButton(true));
     $("#requests-menu-empty-notice").hidden = false;
 
     this.empty();
-    this.refreshSummary();
+    this.updateRequests();
   },
 
   /**
-   * Refreshes the status displayed in this container's footer, providing
-   * concise information about all requests.
+   * Update store request itmes and trigger related UI update
    */
-  refreshSummary: function () {
-    let visibleItems = this.visibleItems;
-    let visibleRequestsCount = visibleItems.length;
-    if (!visibleRequestsCount) {
-      this._summary.setAttribute("label", L10N.getStr("networkMenu.empty"));
-      return;
-    }
-
-    let totalBytes = this._getTotalBytesOfRequests(visibleItems);
-    let totalMillis =
-      this._getNewestRequest(visibleItems).attachment.endedMillis -
-      this._getOldestRequest(visibleItems).attachment.startedMillis;
-
-    // https://developer.mozilla.org/en-US/docs/Localization_and_Plurals
-    let str = PluralForm.get(visibleRequestsCount,
-      L10N.getStr("networkMenu.summary"));
-
-    this._summary.setAttribute("label", str
-      .replace("#1", visibleRequestsCount)
-      .replace("#2", L10N.numberWithDecimals((totalBytes || 0) / 1024,
-        CONTENT_SIZE_DECIMALS))
-      .replace("#3", L10N.numberWithDecimals((totalMillis || 0) / 1000,
-        REQUEST_TIME_DECIMALS))
-    );
+  updateRequests: function () {
+    this.store.dispatch(Actions.updateRequests(this.visibleItems));
   },
 
   /**
@@ -865,7 +834,6 @@ RequestsMenuView.prototype = Heritage.extend(WidgetMethods, {
     this._updateQueue = [];
     this._addQueue = [];
 
-    this.store.dispatch(Actions.disableToggleButton(!this.itemCount));
     $("#requests-menu-empty-notice").hidden = !!this.itemCount;
 
     // Make sure all the requests are sorted and filtered.
@@ -875,7 +843,7 @@ RequestsMenuView.prototype = Heritage.extend(WidgetMethods, {
     // so this doesn't happen once per network event update).
     this.sortContents();
     this.filterContents();
-    this.refreshSummary();
+    this.updateRequests();
     this.refreshZebra();
 
     // Rescale all the waterfalls so that everything is visible at once.
@@ -1559,59 +1527,6 @@ RequestsMenuView.prototype = Heritage.extend(WidgetMethods, {
   },
 
   /**
-   * Gets the total number of bytes representing the cumulated content size of
-   * a set of requests. Returns 0 for an empty set.
-   *
-   * @param array itemsArray
-   * @return number
-   */
-  _getTotalBytesOfRequests: function (itemsArray) {
-    if (!itemsArray.length) {
-      return 0;
-    }
-
-    let result = 0;
-    itemsArray.forEach(item => {
-      let size = item.attachment.contentSize;
-      result += (typeof size == "number") ? size : 0;
-    });
-
-    return result;
-  },
-
-  /**
-   * Gets the oldest (first performed) request in a set. Returns null for an
-   * empty set.
-   *
-   * @param array itemsArray
-   * @return object
-   */
-  _getOldestRequest: function (itemsArray) {
-    if (!itemsArray.length) {
-      return null;
-    }
-    return itemsArray.reduce((prev, curr) =>
-      prev.attachment.startedMillis < curr.attachment.startedMillis ?
-        prev : curr);
-  },
-
-  /**
-   * Gets the newest (latest performed) request in a set. Returns null for an
-   * empty set.
-   *
-   * @param array itemsArray
-   * @return object
-   */
-  _getNewestRequest: function (itemsArray) {
-    if (!itemsArray.length) {
-      return null;
-    }
-    return itemsArray.reduce((prev, curr) =>
-      prev.attachment.startedMillis > curr.attachment.startedMillis ?
-        prev : curr);
-  },
-
-  /**
    * Gets the available waterfall width in this container.
    * @return number
    */
diff --git a/devtools/client/netmonitor/selectors/index.js b/devtools/client/netmonitor/selectors/index.js
index f473149b5..8cd6b6ffc 100644
--- a/devtools/client/netmonitor/selectors/index.js
+++ b/devtools/client/netmonitor/selectors/index.js
@@ -1,8 +1,63 @@
 /* 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";
 
+const { createSelector } = require("devtools/client/shared/vendor/reselect");
+
+/**
+ * Gets the total number of bytes representing the cumulated content size of
+ * a set of requests. Returns 0 for an empty set.
+ *
+ * @param {array} items - an array of request items
+ * @return {number} total bytes of requests
+ */
+function getTotalBytesOfRequests(items) {
+  if (!items.length) {
+    return 0;
+  }
+
+  let result = 0;
+  items.forEach((item) => {
+    let size = item.attachment.contentSize;
+    result += (typeof size == "number") ? size : 0;
+  });
+
+  return result;
+}
+
+/**
+ * Gets the total milliseconds for all requests. Returns null for an
+ * empty set.
+ *
+ * @param {array} items - an array of request items
+ * @return {object} total milliseconds for all requests
+ */
+function getTotalMillisOfRequests(items) {
+  if (!items.length) {
+    return null;
+  }
+
+  const oldest = items.reduce((prev, curr) =>
+    prev.attachment.startedMillis < curr.attachment.startedMillis ?
+      prev : curr);
+  const newest = items.reduce((prev, curr) =>
+    prev.attachment.startedMillis > curr.attachment.startedMillis ?
+      prev : curr);
+
+  return newest.attachment.endedMillis - oldest.attachment.startedMillis;
+}
+
+const getSummary = createSelector(
+  (state) => state.requests.items,
+  (requests) => ({
+    count: requests.length,
+    totalBytes: getTotalBytesOfRequests(requests),
+    totalMillis: getTotalMillisOfRequests(requests),
+  })
+);
+
 module.exports = {
-  // selectors...
+  getSummary,
 };
diff --git a/devtools/client/netmonitor/test/browser_net_footer-summary.js b/devtools/client/netmonitor/test/browser_net_footer-summary.js
index e484b2097..94bfa604b 100644
--- a/devtools/client/netmonitor/test/browser_net_footer-summary.js
+++ b/devtools/client/netmonitor/test/browser_net_footer-summary.js
@@ -10,13 +10,14 @@
 
 add_task(function* () {
   requestLongerTimeout(2);
+  let { getSummary } = require("devtools/client/netmonitor/selectors/index");
   let { L10N } = require("devtools/client/netmonitor/l10n");
   let { PluralForm } = require("devtools/shared/plural-form");
 
   let { tab, monitor } = yield initNetMonitor(FILTERING_URL);
   info("Starting test... ");
 
-  let { $, NetMonitorView } = monitor.panelWin;
+  let { $, NetMonitorView, gStore } = monitor.panelWin;
   let { RequestsMenu } = NetMonitorView;
 
   RequestsMenu.lazyUpdate = false;
@@ -43,31 +44,24 @@ add_task(function* () {
   yield teardown(monitor);
 
   function testStatus() {
-    let summary = $("#requests-menu-network-summary-button");
-    let value = summary.getAttribute("label");
+    const { count, totalBytes, totalMillis } = getSummary(gStore.getState());
+    let value = $("#requests-menu-network-summary-button").textContent;
     info("Current summary: " + value);
 
-    let visibleItems = RequestsMenu.visibleItems;
-    let visibleRequestsCount = visibleItems.length;
     let totalRequestsCount = RequestsMenu.itemCount;
-    info("Current requests: " + visibleRequestsCount + " of " + totalRequestsCount + ".");
+    info("Current requests: " + count + " of " + totalRequestsCount + ".");
 
-    if (!totalRequestsCount || !visibleRequestsCount) {
+    if (!totalRequestsCount || !count) {
       is(value, L10N.getStr("networkMenu.empty"),
         "The current summary text is incorrect, expected an 'empty' label.");
       return;
     }
 
-    let totalBytes = RequestsMenu._getTotalBytesOfRequests(visibleItems);
-    let totalMillis =
-      RequestsMenu._getNewestRequest(visibleItems).attachment.endedMillis -
-      RequestsMenu._getOldestRequest(visibleItems).attachment.startedMillis;
-
     info("Computed total bytes: " + totalBytes);
     info("Computed total millis: " + totalMillis);
 
-    is(value, PluralForm.get(visibleRequestsCount, L10N.getStr("networkMenu.summary"))
-      .replace("#1", visibleRequestsCount)
+    is(value, PluralForm.get(count, L10N.getStr("networkMenu.summary"))
+      .replace("#1", count)
       .replace("#2", L10N.numberWithDecimals((totalBytes || 0) / 1024, 2))
       .replace("#3", L10N.numberWithDecimals((totalMillis || 0) / 1000, 2))
     , "The current summary text is incorrect.");
diff --git a/devtools/client/netmonitor/toolbar-view.js b/devtools/client/netmonitor/toolbar-view.js
index 28c3cf99b..1834d3ee9 100644
--- a/devtools/client/netmonitor/toolbar-view.js
+++ b/devtools/client/netmonitor/toolbar-view.js
@@ -7,6 +7,7 @@ const Provider = createFactory(require("devtools/client/shared/vendor/react-redu
 const FilterButtons = createFactory(require("./components/filter-buttons"));
 const ToggleButton = createFactory(require("./components/toggle-button"));
 const SearchBox = createFactory(require("./components/search-box"));
+const SummaryButton = createFactory(require("./components/summary-button"));
 const { L10N } = require("./l10n");
 
 // Shortcuts
@@ -28,8 +29,9 @@ ToolbarView.prototype = {
 
     this._clearContainerNode = $("#react-clear-button-hook");
     this._filterContainerNode = $("#react-filter-buttons-hook");
-    this._toggleContainerNode = $("#react-details-pane-toggle-hook");
+    this._summaryContainerNode = $("#react-summary-button-hook");
     this._searchContainerNode = $("#react-search-box-hook");
+    this._toggleContainerNode = $("#react-details-pane-toggle-hook");
 
     // clear button
     ReactDOM.render(button({
@@ -47,6 +49,12 @@ ToolbarView.prototype = {
       FilterButtons()
     ), this._filterContainerNode);
 
+    // summary button
+    ReactDOM.render(Provider(
+      { store },
+      SummaryButton()
+    ), this._summaryContainerNode);
+
     // search box
     ReactDOM.render(Provider(
       { store },
@@ -68,8 +76,9 @@ ToolbarView.prototype = {
 
     ReactDOM.unmountComponentAtNode(this._clearContainerNode);
     ReactDOM.unmountComponentAtNode(this._filterContainerNode);
-    ReactDOM.unmountComponentAtNode(this._toggleContainerNode);
+    ReactDOM.unmountComponentAtNode(this._summaryContainerNode);
     ReactDOM.unmountComponentAtNode(this._searchContainerNode);
+    ReactDOM.unmountComponentAtNode(this._toggleContainerNode);
   }
 
 };