Add m-esr52 at 52.6.0

1 files changed, 1522 insertions, 0 deletions

diff --git a/devtools/client/inspector/computed/computed.js b/devtools/client/inspector/computed/computed.js
new file mode 100644
index 000000000..71d602a4e
--- /dev/null
+++ b/devtools/client/inspector/computed/computed.js
@@ -0,0 +1,1522 @@
+/* -*- indent-tabs-mode: nil; js-indent-level: 2 -*- */
+/* vim: set 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/. */
+
+"use strict";
+
+const ToolDefinitions = require("devtools/client/definitions").Tools;
+const CssLogic = require("devtools/shared/inspector/css-logic");
+const {ELEMENT_STYLE} = require("devtools/shared/specs/styles");
+const promise = require("promise");
+const defer = require("devtools/shared/defer");
+const Services = require("Services");
+const {OutputParser} = require("devtools/client/shared/output-parser");
+const {PrefObserver, PREF_ORIG_SOURCES} = require("devtools/client/styleeditor/utils");
+const {createChild} = require("devtools/client/inspector/shared/utils");
+const {gDevTools} = require("devtools/client/framework/devtools");
+const {getCssProperties} = require("devtools/shared/fronts/css-properties");
+const HighlightersOverlay = require("devtools/client/inspector/shared/highlighters-overlay");
+const {
+  VIEW_NODE_SELECTOR_TYPE,
+  VIEW_NODE_PROPERTY_TYPE,
+  VIEW_NODE_VALUE_TYPE,
+  VIEW_NODE_IMAGE_URL_TYPE,
+} = require("devtools/client/inspector/shared/node-types");
+const StyleInspectorMenu = require("devtools/client/inspector/shared/style-inspector-menu");
+const TooltipsOverlay = require("devtools/client/inspector/shared/tooltips-overlay");
+const {KeyShortcuts} = require("devtools/client/shared/key-shortcuts");
+const {BoxModelView} = require("devtools/client/inspector/components/box-model");
+const clipboardHelper = require("devtools/shared/platform/clipboard");
+
+const STYLE_INSPECTOR_PROPERTIES = "devtools/shared/locales/styleinspector.properties";
+const {LocalizationHelper} = require("devtools/shared/l10n");
+const STYLE_INSPECTOR_L10N = new LocalizationHelper(STYLE_INSPECTOR_PROPERTIES);
+
+const FILTER_CHANGED_TIMEOUT = 150;
+const HTML_NS = "http://www.w3.org/1999/xhtml";
+
+/**
+ * Helper for long-running processes that should yield occasionally to
+ * the mainloop.
+ *
+ * @param {Window} win
+ *        Timeouts will be set on this window when appropriate.
+ * @param {Array} array
+ *        The array of items to process.
+ * @param {Object} options
+ *        Options for the update process:
+ *          onItem {function} Will be called with the value of each iteration.
+ *          onBatch {function} Will be called after each batch of iterations,
+ *            before yielding to the main loop.
+ *          onDone {function} Will be called when iteration is complete.
+ *          onCancel {function} Will be called if the process is canceled.
+ *          threshold {int} How long to process before yielding, in ms.
+ */
+function UpdateProcess(win, array, options) {
+  this.win = win;
+  this.index = 0;
+  this.array = array;
+
+  this.onItem = options.onItem || function () {};
+  this.onBatch = options.onBatch || function () {};
+  this.onDone = options.onDone || function () {};
+  this.onCancel = options.onCancel || function () {};
+  this.threshold = options.threshold || 45;
+
+  this.canceled = false;
+}
+
+UpdateProcess.prototype = {
+  /**
+   * Error thrown when the array of items to process is empty.
+   */
+  ERROR_ITERATION_DONE: new Error("UpdateProcess iteration done"),
+
+  /**
+   * Schedule a new batch on the main loop.
+   */
+  schedule: function () {
+    if (this.canceled) {
+      return;
+    }
+    this._timeout = setTimeout(this._timeoutHandler.bind(this), 0);
+  },
+
+  /**
+   * Cancel the running process.  onItem will not be called again,
+   * and onCancel will be called.
+   */
+  cancel: function () {
+    if (this._timeout) {
+      clearTimeout(this._timeout);
+      this._timeout = 0;
+    }
+    this.canceled = true;
+    this.onCancel();
+  },
+
+  _timeoutHandler: function () {
+    this._timeout = null;
+    try {
+      this._runBatch();
+      this.schedule();
+    } catch (e) {
+      if (e === this.ERROR_ITERATION_DONE) {
+        this.onBatch();
+        this.onDone();
+        return;
+      }
+      console.error(e);
+      throw e;
+    }
+  },
+
+  _runBatch: function () {
+    let time = Date.now();
+    while (!this.canceled) {
+      let next = this._next();
+      this.onItem(next);
+      if ((Date.now() - time) > this.threshold) {
+        this.onBatch();
+        return;
+      }
+    }
+  },
+
+  /**
+   * Returns the item at the current index and increases the index.
+   * If all items have already been processed, will throw ERROR_ITERATION_DONE.
+   */
+  _next: function () {
+    if (this.index < this.array.length) {
+      return this.array[this.index++];
+    }
+    throw this.ERROR_ITERATION_DONE;
+  },
+};
+
+/**
+ * CssComputedView is a panel that manages the display of a table
+ * sorted by style. There should be one instance of CssComputedView
+ * per style display (of which there will generally only be one).
+ *
+ * @param {Inspector} inspector
+ *        Inspector toolbox panel
+ * @param {Document} document
+ *        The document that will contain the computed view.
+ * @param {PageStyleFront} pageStyle
+ *        Front for the page style actor that will be providing
+ *        the style information.
+ */
+function CssComputedView(inspector, document, pageStyle) {
+  this.inspector = inspector;
+  this.styleDocument = document;
+  this.styleWindow = this.styleDocument.defaultView;
+  this.pageStyle = pageStyle;
+
+  this.propertyViews = [];
+
+  let cssProperties = getCssProperties(inspector.toolbox);
+  this._outputParser = new OutputParser(document, cssProperties);
+
+  // Create bound methods.
+  this.focusWindow = this.focusWindow.bind(this);
+  this._onContextMenu = this._onContextMenu.bind(this);
+  this._onClick = this._onClick.bind(this);
+  this._onCopy = this._onCopy.bind(this);
+  this._onFilterStyles = this._onFilterStyles.bind(this);
+  this._onClearSearch = this._onClearSearch.bind(this);
+  this._onIncludeBrowserStyles = this._onIncludeBrowserStyles.bind(this);
+
+  let doc = this.styleDocument;
+  this.element = doc.getElementById("propertyContainer");
+  this.searchField = doc.getElementById("computedview-searchbox");
+  this.searchClearButton = doc.getElementById("computedview-searchinput-clear");
+  this.includeBrowserStylesCheckbox =
+    doc.getElementById("browser-style-checkbox");
+
+  this.shortcuts = new KeyShortcuts({ window: this.styleWindow });
+  this._onShortcut = this._onShortcut.bind(this);
+  this.shortcuts.on("CmdOrCtrl+F", this._onShortcut);
+  this.shortcuts.on("Escape", this._onShortcut);
+  this.styleDocument.addEventListener("mousedown", this.focusWindow);
+  this.element.addEventListener("click", this._onClick);
+  this.element.addEventListener("copy", this._onCopy);
+  this.element.addEventListener("contextmenu", this._onContextMenu);
+  this.searchField.addEventListener("input", this._onFilterStyles);
+  this.searchField.addEventListener("contextmenu", this.inspector.onTextBoxContextMenu);
+  this.searchClearButton.addEventListener("click", this._onClearSearch);
+  this.includeBrowserStylesCheckbox.addEventListener("input",
+    this._onIncludeBrowserStyles);
+
+  this.searchClearButton.hidden = true;
+
+  // No results text.
+  this.noResults = this.styleDocument.getElementById("computedview-no-results");
+
+  // Refresh panel when color unit changed.
+  this._handlePrefChange = this._handlePrefChange.bind(this);
+  gDevTools.on("pref-changed", this._handlePrefChange);
+
+  // Refresh panel when pref for showing original sources changes
+  this._onSourcePrefChanged = this._onSourcePrefChanged.bind(this);
+  this._prefObserver = new PrefObserver("devtools.");
+  this._prefObserver.on(PREF_ORIG_SOURCES, this._onSourcePrefChanged);
+
+  // The element that we're inspecting, and the document that it comes from.
+  this._viewedElement = null;
+
+  this.createStyleViews();
+
+  this._contextmenu = new StyleInspectorMenu(this, { isRuleView: false });
+
+  // Add the tooltips and highlightersoverlay
+  this.tooltips = new TooltipsOverlay(this);
+  this.tooltips.addToView();
+
+  this.highlighters = new HighlightersOverlay(this);
+  this.highlighters.addToView();
+}
+
+/**
+ * Lookup a l10n string in the shared styleinspector string bundle.
+ *
+ * @param {String} name
+ *        The key to lookup.
+ * @returns {String} localized version of the given key.
+ */
+CssComputedView.l10n = function (name) {
+  try {
+    return STYLE_INSPECTOR_L10N.getStr(name);
+  } catch (ex) {
+    console.log("Error reading '" + name + "'");
+    throw new Error("l10n error with " + name);
+  }
+};
+
+CssComputedView.prototype = {
+  // Cache the list of properties that match the selected element.
+  _matchedProperties: null,
+
+  // Used for cancelling timeouts in the style filter.
+  _filterChangedTimeout: null,
+
+  // Holds the ID of the panelRefresh timeout.
+  _panelRefreshTimeout: null,
+
+  // Toggle for zebra striping
+  _darkStripe: true,
+
+  // Number of visible properties
+  numVisibleProperties: 0,
+
+  setPageStyle: function (pageStyle) {
+    this.pageStyle = pageStyle;
+  },
+
+  get includeBrowserStyles() {
+    return this.includeBrowserStylesCheckbox.checked;
+  },
+
+  _handlePrefChange: function (event, data) {
+    if (this._computed && (data.pref === "devtools.defaultColorUnit" ||
+        data.pref === PREF_ORIG_SOURCES)) {
+      this.refreshPanel();
+    }
+  },
+
+  /**
+   * Update the view with a new selected element. The CssComputedView panel
+   * will show the style information for the given element.
+   *
+   * @param {NodeFront} element
+   *        The highlighted node to get styles for.
+   * @returns a promise that will be resolved when highlighting is complete.
+   */
+  selectElement: function (element) {
+    if (!element) {
+      this._viewedElement = null;
+      this.noResults.hidden = false;
+
+      if (this._refreshProcess) {
+        this._refreshProcess.cancel();
+      }
+      // Hiding all properties
+      for (let propView of this.propertyViews) {
+        propView.refresh();
+      }
+      return promise.resolve(undefined);
+    }
+
+    if (element === this._viewedElement) {
+      return promise.resolve(undefined);
+    }
+
+    this._viewedElement = element;
+    this.refreshSourceFilter();
+
+    return this.refreshPanel();
+  },
+
+  /**
+   * Get the type of a given node in the computed-view
+   *
+   * @param {DOMNode} node
+   *        The node which we want information about
+   * @return {Object} The type information object contains the following props:
+   * - type {String} One of the VIEW_NODE_XXX_TYPE const in
+   *   client/inspector/shared/node-types
+   * - value {Object} Depends on the type of the node
+   * returns null if the node isn't anything we care about
+   */
+  getNodeInfo: function (node) {
+    if (!node) {
+      return null;
+    }
+
+    let classes = node.classList;
+
+    // Check if the node isn't a selector first since this doesn't require
+    // walking the DOM
+    if (classes.contains("matched") ||
+        classes.contains("bestmatch") ||
+        classes.contains("parentmatch")) {
+      let selectorText = "";
+      for (let child of node.childNodes) {
+        if (child.nodeType === node.TEXT_NODE) {
+          selectorText += child.textContent;
+        }
+      }
+      return {
+        type: VIEW_NODE_SELECTOR_TYPE,
+        value: selectorText.trim()
+      };
+    }
+
+    // Walk up the nodes to find out where node is
+    let propertyView;
+    let propertyContent;
+    let parent = node;
+    while (parent.parentNode) {
+      if (parent.classList.contains("property-view")) {
+        propertyView = parent;
+        break;
+      }
+      if (parent.classList.contains("property-content")) {
+        propertyContent = parent;
+        break;
+      }
+      parent = parent.parentNode;
+    }
+    if (!propertyView && !propertyContent) {
+      return null;
+    }
+
+    let value, type;
+
+    // Get the property and value for a node that's a property name or value
+    let isHref = classes.contains("theme-link") && !classes.contains("link");
+    if (propertyView && (classes.contains("property-name") ||
+                         classes.contains("property-value") ||
+                         isHref)) {
+      value = {
+        property: parent.querySelector(".property-name").textContent,
+        value: parent.querySelector(".property-value").textContent
+      };
+    }
+    if (propertyContent && (classes.contains("other-property-value") ||
+                            isHref)) {
+      let view = propertyContent.previousSibling;
+      value = {
+        property: view.querySelector(".property-name").textContent,
+        value: node.textContent
+      };
+    }
+
+    // Get the type
+    if (classes.contains("property-name")) {
+      type = VIEW_NODE_PROPERTY_TYPE;
+    } else if (classes.contains("property-value") ||
+               classes.contains("other-property-value")) {
+      type = VIEW_NODE_VALUE_TYPE;
+    } else if (isHref) {
+      type = VIEW_NODE_IMAGE_URL_TYPE;
+      value.url = node.href;
+    } else {
+      return null;
+    }
+
+    return {type, value};
+  },
+
+  _createPropertyViews: function () {
+    if (this._createViewsPromise) {
+      return this._createViewsPromise;
+    }
+
+    let deferred = defer();
+    this._createViewsPromise = deferred.promise;
+
+    this.refreshSourceFilter();
+    this.numVisibleProperties = 0;
+    let fragment = this.styleDocument.createDocumentFragment();
+
+    this._createViewsProcess = new UpdateProcess(
+      this.styleWindow, CssComputedView.propertyNames, {
+        onItem: (propertyName) => {
+          // Per-item callback.
+          let propView = new PropertyView(this, propertyName);
+          fragment.appendChild(propView.buildMain());
+          fragment.appendChild(propView.buildSelectorContainer());
+
+          if (propView.visible) {
+            this.numVisibleProperties++;
+          }
+          this.propertyViews.push(propView);
+        },
+        onCancel: () => {
+          deferred.reject("_createPropertyViews cancelled");
+        },
+        onDone: () => {
+          // Completed callback.
+          this.element.appendChild(fragment);
+          this.noResults.hidden = this.numVisibleProperties > 0;
+          deferred.resolve(undefined);
+        }
+      }
+    );
+
+    this._createViewsProcess.schedule();
+    return deferred.promise;
+  },
+
+  /**
+   * Refresh the panel content.
+   */
+  refreshPanel: function () {
+    if (!this._viewedElement) {
+      return promise.resolve();
+    }
+
+    // Capture the current viewed element to return from the promise handler
+    // early if it changed
+    let viewedElement = this._viewedElement;
+
+    return promise.all([
+      this._createPropertyViews(),
+      this.pageStyle.getComputed(this._viewedElement, {
+        filter: this._sourceFilter,
+        onlyMatched: !this.includeBrowserStyles,
+        markMatched: true
+      })
+    ]).then(([, computed]) => {
+      if (viewedElement !== this._viewedElement) {
+        return promise.resolve();
+      }
+
+      this._matchedProperties = new Set();
+      for (let name in computed) {
+        if (computed[name].matched) {
+          this._matchedProperties.add(name);
+        }
+      }
+      this._computed = computed;
+
+      if (this._refreshProcess) {
+        this._refreshProcess.cancel();
+      }
+
+      this.noResults.hidden = true;
+
+      // Reset visible property count
+      this.numVisibleProperties = 0;
+
+      // Reset zebra striping.
+      this._darkStripe = true;
+
+      let deferred = defer();
+      this._refreshProcess = new UpdateProcess(
+        this.styleWindow, this.propertyViews, {
+          onItem: (propView) => {
+            propView.refresh();
+          },
+          onCancel: () => {
+            deferred.reject("_refreshProcess of computed view cancelled");
+          },
+          onDone: () => {
+            this._refreshProcess = null;
+            this.noResults.hidden = this.numVisibleProperties > 0;
+
+            if (this.searchField.value.length > 0 &&
+                !this.numVisibleProperties) {
+              this.searchField.classList
+                              .add("devtools-style-searchbox-no-match");
+            } else {
+              this.searchField.classList
+                              .remove("devtools-style-searchbox-no-match");
+            }
+
+            this.inspector.emit("computed-view-refreshed");
+            deferred.resolve(undefined);
+          }
+        }
+      );
+      this._refreshProcess.schedule();
+      return deferred.promise;
+    }).then(null, (err) => console.error(err));
+  },
+
+  /**
+   * Handle the shortcut events in the computed view.
+   */
+  _onShortcut: function (name, event) {
+    if (!event.target.closest("#sidebar-panel-computedview")) {
+      return;
+    }
+    // Handle the search box's keypress event. If the escape key is pressed,
+    // clear the search box field.
+    if (name === "Escape" && event.target === this.searchField &&
+        this._onClearSearch()) {
+      event.preventDefault();
+      event.stopPropagation();
+    } else if (name === "CmdOrCtrl+F") {
+      this.searchField.focus();
+      event.preventDefault();
+    }
+  },
+
+  /**
+   * Set the filter style search value.
+   * @param {String} value
+   *        The search value.
+   */
+  setFilterStyles: function (value = "") {
+    this.searchField.value = value;
+    this.searchField.focus();
+    this._onFilterStyles();
+  },
+
+  /**
+   * Called when the user enters a search term in the filter style search box.
+   */
+  _onFilterStyles: function () {
+    if (this._filterChangedTimeout) {
+      clearTimeout(this._filterChangedTimeout);
+    }
+
+    let filterTimeout = (this.searchField.value.length > 0)
+      ? FILTER_CHANGED_TIMEOUT : 0;
+    this.searchClearButton.hidden = this.searchField.value.length === 0;
+
+    this._filterChangedTimeout = setTimeout(() => {
+      if (this.searchField.value.length > 0) {
+        this.searchField.setAttribute("filled", true);
+        this.inspector.emit("computed-view-filtered", true);
+      } else {
+        this.searchField.removeAttribute("filled");
+        this.inspector.emit("computed-view-filtered", false);
+      }
+
+      this.refreshPanel();
+      this._filterChangeTimeout = null;
+    }, filterTimeout);
+  },
+
+  /**
+   * Called when the user clicks on the clear button in the filter style search
+   * box. Returns true if the search box is cleared and false otherwise.
+   */
+  _onClearSearch: function () {
+    if (this.searchField.value) {
+      this.setFilterStyles("");
+      return true;
+    }
+
+    return false;
+  },
+
+  /**
+   * The change event handler for the includeBrowserStyles checkbox.
+   */
+  _onIncludeBrowserStyles: function () {
+    this.refreshSourceFilter();
+    this.refreshPanel();
+  },
+
+  /**
+   * When includeBrowserStylesCheckbox.checked is false we only display
+   * properties that have matched selectors and have been included by the
+   * document or one of thedocument's stylesheets. If .checked is false we
+   * display all properties including those that come from UA stylesheets.
+   */
+  refreshSourceFilter: function () {
+    this._matchedProperties = null;
+    this._sourceFilter = this.includeBrowserStyles ?
+                                 CssLogic.FILTER.UA :
+                                 CssLogic.FILTER.USER;
+  },
+
+  _onSourcePrefChanged: function () {
+    for (let propView of this.propertyViews) {
+      propView.updateSourceLinks();
+    }
+    this.inspector.emit("computed-view-sourcelinks-updated");
+  },
+
+  /**
+   * The CSS as displayed by the UI.
+   */
+  createStyleViews: function () {
+    if (CssComputedView.propertyNames) {
+      return;
+    }
+
+    CssComputedView.propertyNames = [];
+
+    // Here we build and cache a list of css properties supported by the browser
+    // We could use any element but let's use the main document's root element
+    let styles = this.styleWindow
+      .getComputedStyle(this.styleDocument.documentElement);
+    let mozProps = [];
+    for (let i = 0, numStyles = styles.length; i < numStyles; i++) {
+      let prop = styles.item(i);
+      if (prop.startsWith("--")) {
+        // Skip any CSS variables used inside of browser CSS files
+        continue;
+      } else if (prop.startsWith("-")) {
+        mozProps.push(prop);
+      } else {
+        CssComputedView.propertyNames.push(prop);
+      }
+    }
+
+    CssComputedView.propertyNames.sort();
+    CssComputedView.propertyNames.push.apply(CssComputedView.propertyNames,
+      mozProps.sort());
+
+    this._createPropertyViews().then(null, e => {
+      if (!this._isDestroyed) {
+        console.warn("The creation of property views was cancelled because " +
+          "the computed-view was destroyed before it was done creating views");
+      } else {
+        console.error(e);
+      }
+    });
+  },
+
+  /**
+   * Get a set of properties that have matched selectors.
+   *
+   * @return {Set} If a property name is in the set, it has matching selectors.
+   */
+  get matchedProperties() {
+    return this._matchedProperties || new Set();
+  },
+
+  /**
+   * Focus the window on mousedown.
+   */
+  focusWindow: function () {
+    this.styleWindow.focus();
+  },
+
+  /**
+   * Context menu handler.
+   */
+  _onContextMenu: function (event) {
+    this._contextmenu.show(event);
+  },
+
+  _onClick: function (event) {
+    let target = event.target;
+
+    if (target.nodeName === "a") {
+      event.stopPropagation();
+      event.preventDefault();
+      let browserWin = this.inspector.target.tab.ownerDocument.defaultView;
+      browserWin.openUILinkIn(target.href, "tab");
+    }
+  },
+
+  /**
+   * Callback for copy event. Copy selected text.
+   *
+   * @param {Event} event
+   *        copy event object.
+   */
+  _onCopy: function (event) {
+    this.copySelection();
+    event.preventDefault();
+  },
+
+  /**
+   * Copy the current selection to the clipboard
+   */
+  copySelection: function () {
+    try {
+      let win = this.styleWindow;
+      let text = win.getSelection().toString().trim();
+
+      // Tidy up block headings by moving CSS property names and their
+      // values onto the same line and inserting a colon between them.
+      let textArray = text.split(/[\r\n]+/);
+      let result = "";
+
+      // Parse text array to output string.
+      if (textArray.length > 1) {
+        for (let prop of textArray) {
+          if (CssComputedView.propertyNames.indexOf(prop) !== -1) {
+            // Property name
+            result += prop;
+          } else {
+            // Property value
+            result += ": " + prop + ";\n";
+          }
+        }
+      } else {
+        // Short text fragment.
+        result = textArray[0];
+      }
+
+      clipboardHelper.copyString(result);
+    } catch (e) {
+      console.error(e);
+    }
+  },
+
+  /**
+   * Destructor for CssComputedView.
+   */
+  destroy: function () {
+    this._viewedElement = null;
+    this._outputParser = null;
+
+    gDevTools.off("pref-changed", this._handlePrefChange);
+
+    this._prefObserver.off(PREF_ORIG_SOURCES, this._onSourcePrefChanged);
+    this._prefObserver.destroy();
+
+    // Cancel tree construction
+    if (this._createViewsProcess) {
+      this._createViewsProcess.cancel();
+    }
+    if (this._refreshProcess) {
+      this._refreshProcess.cancel();
+    }
+
+    // Remove context menu
+    if (this._contextmenu) {
+      this._contextmenu.destroy();
+      this._contextmenu = null;
+    }
+
+    this.tooltips.destroy();
+    this.highlighters.destroy();
+
+    // Remove bound listeners
+    this.styleDocument.removeEventListener("mousedown", this.focusWindow);
+    this.element.removeEventListener("click", this._onClick);
+    this.element.removeEventListener("copy", this._onCopy);
+    this.element.removeEventListener("contextmenu", this._onContextMenu);
+    this.searchField.removeEventListener("input", this._onFilterStyles);
+    this.searchField.removeEventListener("contextmenu",
+      this.inspector.onTextBoxContextMenu);
+    this.searchClearButton.removeEventListener("click", this._onClearSearch);
+    this.includeBrowserStylesCheckbox.removeEventListener("input",
+      this._onIncludeBrowserStyles);
+
+    // Nodes used in templating
+    this.element = null;
+    this.panel = null;
+    this.searchField = null;
+    this.searchClearButton = null;
+    this.includeBrowserStylesCheckbox = null;
+
+    // Property views
+    for (let propView of this.propertyViews) {
+      propView.destroy();
+    }
+    this.propertyViews = null;
+
+    this.inspector = null;
+    this.styleDocument = null;
+    this.styleWindow = null;
+
+    this._isDestroyed = true;
+  }
+};
+
+function PropertyInfo(tree, name) {
+  this.tree = tree;
+  this.name = name;
+}
+
+PropertyInfo.prototype = {
+  get value() {
+    if (this.tree._computed) {
+      let value = this.tree._computed[this.name].value;
+      return value;
+    }
+    return null;
+  }
+};
+
+/**
+ * A container to give easy access to property data from the template engine.
+ *
+ * @param {CssComputedView} tree
+ *        The CssComputedView instance we are working with.
+ * @param {String} name
+ *        The CSS property name for which this PropertyView
+ *        instance will render the rules.
+ */
+function PropertyView(tree, name) {
+  this.tree = tree;
+  this.name = name;
+
+  this.link = "https://developer.mozilla.org/CSS/" + name;
+
+  this._propertyInfo = new PropertyInfo(tree, name);
+}
+
+PropertyView.prototype = {
+  // The parent element which contains the open attribute
+  element: null,
+
+  // Property header node
+  propertyHeader: null,
+
+  // Destination for property names
+  nameNode: null,
+
+  // Destination for property values
+  valueNode: null,
+
+  // Are matched rules expanded?
+  matchedExpanded: false,
+
+  // Matched selector container
+  matchedSelectorsContainer: null,
+
+  // Matched selector expando
+  matchedExpander: null,
+
+  // Cache for matched selector views
+  _matchedSelectorViews: null,
+
+  // The previously selected element used for the selector view caches
+  _prevViewedElement: null,
+
+  /**
+   * Get the computed style for the current property.
+   *
+   * @return {String} the computed style for the current property of the
+   * currently highlighted element.
+   */
+  get value() {
+    return this.propertyInfo.value;
+  },
+
+  /**
+   * An easy way to access the CssPropertyInfo behind this PropertyView.
+   */
+  get propertyInfo() {
+    return this._propertyInfo;
+  },
+
+  /**
+   * Does the property have any matched selectors?
+   */
+  get hasMatchedSelectors() {
+    return this.tree.matchedProperties.has(this.name);
+  },
+
+  /**
+   * Should this property be visible?
+   */
+  get visible() {
+    if (!this.tree._viewedElement) {
+      return false;
+    }
+
+    if (!this.tree.includeBrowserStyles && !this.hasMatchedSelectors) {
+      return false;
+    }
+
+    let searchTerm = this.tree.searchField.value.toLowerCase();
+    let isValidSearchTerm = searchTerm.trim().length > 0;
+    if (isValidSearchTerm &&
+        this.name.toLowerCase().indexOf(searchTerm) === -1 &&
+        this.value.toLowerCase().indexOf(searchTerm) === -1) {
+      return false;
+    }
+
+    return true;
+  },
+
+  /**
+   * Returns the className that should be assigned to the propertyView.
+   *
+   * @return {String}
+   */
+  get propertyHeaderClassName() {
+    if (this.visible) {
+      let isDark = this.tree._darkStripe = !this.tree._darkStripe;
+      return isDark ? "property-view row-striped" : "property-view";
+    }
+    return "property-view-hidden";
+  },
+
+  /**
+   * Returns the className that should be assigned to the propertyView content
+   * container.
+   *
+   * @return {String}
+   */
+  get propertyContentClassName() {
+    if (this.visible) {
+      let isDark = this.tree._darkStripe;
+      return isDark ? "property-content row-striped" : "property-content";
+    }
+    return "property-content-hidden";
+  },
+
+  /**
+   * Build the markup for on computed style
+   *
+   * @return {Element}
+   */
+  buildMain: function () {
+    let doc = this.tree.styleDocument;
+
+    // Build the container element
+    this.onMatchedToggle = this.onMatchedToggle.bind(this);
+    this.element = doc.createElementNS(HTML_NS, "div");
+    this.element.setAttribute("class", this.propertyHeaderClassName);
+    this.element.addEventListener("dblclick", this.onMatchedToggle, false);
+
+    // Make it keyboard navigable
+    this.element.setAttribute("tabindex", "0");
+    this.shortcuts = new KeyShortcuts({
+      window: this.tree.styleWindow,
+      target: this.element
+    });
+    this.shortcuts.on("F1", (name, event) => {
+      this.mdnLinkClick(event);
+      // Prevent opening the options panel
+      event.preventDefault();
+      event.stopPropagation();
+    });
+    this.shortcuts.on("Return", (name, event) => this.onMatchedToggle(event));
+    this.shortcuts.on("Space", (name, event) => this.onMatchedToggle(event));
+
+    let nameContainer = doc.createElementNS(HTML_NS, "div");
+    nameContainer.className = "property-name-container";
+    this.element.appendChild(nameContainer);
+
+    // Build the twisty expand/collapse
+    this.matchedExpander = doc.createElementNS(HTML_NS, "div");
+    this.matchedExpander.className = "expander theme-twisty";
+    this.matchedExpander.addEventListener("click", this.onMatchedToggle, false);
+    nameContainer.appendChild(this.matchedExpander);
+
+    // Build the style name element
+    this.nameNode = doc.createElementNS(HTML_NS, "div");
+    this.nameNode.setAttribute("class", "property-name theme-fg-color5");
+    // Reset its tabindex attribute otherwise, if an ellipsis is applied
+    // it will be reachable via TABing
+    this.nameNode.setAttribute("tabindex", "");
+    // Avoid english text (css properties) from being altered
+    // by RTL mode
+    this.nameNode.setAttribute("dir", "ltr");
+    this.nameNode.textContent = this.nameNode.title = this.name;
+    // Make it hand over the focus to the container
+    this.onFocus = () => this.element.focus();
+    this.nameNode.addEventListener("click", this.onFocus, false);
+    nameContainer.appendChild(this.nameNode);
+
+    let valueContainer = doc.createElementNS(HTML_NS, "div");
+    valueContainer.className = "property-value-container";
+    this.element.appendChild(valueContainer);
+
+    // Build the style value element
+    this.valueNode = doc.createElementNS(HTML_NS, "div");
+    this.valueNode.setAttribute("class", "property-value theme-fg-color1");
+    // Reset its tabindex attribute otherwise, if an ellipsis is applied
+    // it will be reachable via TABing
+    this.valueNode.setAttribute("tabindex", "");
+    this.valueNode.setAttribute("dir", "ltr");
+    // Make it hand over the focus to the container
+    this.valueNode.addEventListener("click", this.onFocus, false);
+    valueContainer.appendChild(this.valueNode);
+
+    return this.element;
+  },
+
+  buildSelectorContainer: function () {
+    let doc = this.tree.styleDocument;
+    let element = doc.createElementNS(HTML_NS, "div");
+    element.setAttribute("class", this.propertyContentClassName);
+    this.matchedSelectorsContainer = doc.createElementNS(HTML_NS, "div");
+    this.matchedSelectorsContainer.setAttribute("class", "matchedselectors");
+    element.appendChild(this.matchedSelectorsContainer);
+
+    return element;
+  },
+
+  /**
+   * Refresh the panel's CSS property value.
+   */
+  refresh: function () {
+    this.element.className = this.propertyHeaderClassName;
+    this.element.nextElementSibling.className = this.propertyContentClassName;
+
+    if (this._prevViewedElement !== this.tree._viewedElement) {
+      this._matchedSelectorViews = null;
+      this._prevViewedElement = this.tree._viewedElement;
+    }
+
+    if (!this.tree._viewedElement || !this.visible) {
+      this.valueNode.textContent = this.valueNode.title = "";
+      this.matchedSelectorsContainer.parentNode.hidden = true;
+      this.matchedSelectorsContainer.textContent = "";
+      this.matchedExpander.removeAttribute("open");
+      return;
+    }
+
+    this.tree.numVisibleProperties++;
+
+    let outputParser = this.tree._outputParser;
+    let frag = outputParser.parseCssProperty(this.propertyInfo.name,
+      this.propertyInfo.value,
+      {
+        colorSwatchClass: "computedview-colorswatch",
+        colorClass: "computedview-color",
+        urlClass: "theme-link"
+        // No need to use baseURI here as computed URIs are never relative.
+      });
+    this.valueNode.innerHTML = "";
+    this.valueNode.appendChild(frag);
+
+    this.refreshMatchedSelectors();
+  },
+
+  /**
+   * Refresh the panel matched rules.
+   */
+  refreshMatchedSelectors: function () {
+    let hasMatchedSelectors = this.hasMatchedSelectors;
+    this.matchedSelectorsContainer.parentNode.hidden = !hasMatchedSelectors;
+
+    if (hasMatchedSelectors) {
+      this.matchedExpander.classList.add("expandable");
+    } else {
+      this.matchedExpander.classList.remove("expandable");
+    }
+
+    if (this.matchedExpanded && hasMatchedSelectors) {
+      return this.tree.pageStyle
+        .getMatchedSelectors(this.tree._viewedElement, this.name)
+        .then(matched => {
+          if (!this.matchedExpanded) {
+            return promise.resolve(undefined);
+          }
+
+          this._matchedSelectorResponse = matched;
+
+          return this._buildMatchedSelectors().then(() => {
+            this.matchedExpander.setAttribute("open", "");
+            this.tree.inspector.emit("computed-view-property-expanded");
+          });
+        }).then(null, console.error);
+    }
+
+    this.matchedSelectorsContainer.innerHTML = "";
+    this.matchedExpander.removeAttribute("open");
+    this.tree.inspector.emit("computed-view-property-collapsed");
+    return promise.resolve(undefined);
+  },
+
+  get matchedSelectors() {
+    return this._matchedSelectorResponse;
+  },
+
+  _buildMatchedSelectors: function () {
+    let promises = [];
+    let frag = this.element.ownerDocument.createDocumentFragment();
+
+    for (let selector of this.matchedSelectorViews) {
+      let p = createChild(frag, "p");
+      let span = createChild(p, "span", {
+        class: "rule-link"
+      });
+      let link = createChild(span, "a", {
+        target: "_blank",
+        class: "link theme-link",
+        title: selector.href,
+        sourcelocation: selector.source,
+        tabindex: "0",
+        textContent: selector.source
+      });
+      link.addEventListener("click", selector.openStyleEditor, false);
+      let shortcuts = new KeyShortcuts({
+        window: this.tree.styleWindow,
+        target: link
+      });
+      shortcuts.on("Return", () => selector.openStyleEditor());
+
+      let status = createChild(p, "span", {
+        dir: "ltr",
+        class: "rule-text theme-fg-color3 " + selector.statusClass,
+        title: selector.statusText,
+        textContent: selector.sourceText
+      });
+      let valueSpan = createChild(status, "span", {
+        class: "other-property-value theme-fg-color1"
+      });
+      valueSpan.appendChild(selector.outputFragment);
+      promises.push(selector.ready);
+    }
+
+    this.matchedSelectorsContainer.innerHTML = "";
+    this.matchedSelectorsContainer.appendChild(frag);
+    return promise.all(promises);
+  },
+
+  /**
+   * Provide access to the matched SelectorViews that we are currently
+   * displaying.
+   */
+  get matchedSelectorViews() {
+    if (!this._matchedSelectorViews) {
+      this._matchedSelectorViews = [];
+      this._matchedSelectorResponse.forEach(selectorInfo => {
+        let selectorView = new SelectorView(this.tree, selectorInfo);
+        this._matchedSelectorViews.push(selectorView);
+      }, this);
+    }
+    return this._matchedSelectorViews;
+  },
+
+  /**
+   * Update all the selector source links to reflect whether we're linking to
+   * original sources (e.g. Sass files).
+   */
+  updateSourceLinks: function () {
+    if (!this._matchedSelectorViews) {
+      return;
+    }
+    for (let view of this._matchedSelectorViews) {
+      view.updateSourceLink();
+    }
+  },
+
+  /**
+   * The action when a user expands matched selectors.
+   *
+   * @param {Event} event
+   *        Used to determine the class name of the targets click
+   *        event.
+   */
+  onMatchedToggle: function (event) {
+    if (event.shiftKey) {
+      return;
+    }
+    this.matchedExpanded = !this.matchedExpanded;
+    this.refreshMatchedSelectors();
+    event.preventDefault();
+  },
+
+  /**
+   * The action when a user clicks on the MDN help link for a property.
+   */
+  mdnLinkClick: function (event) {
+    let inspector = this.tree.inspector;
+
+    if (inspector.target.tab) {
+      let browserWin = inspector.target.tab.ownerDocument.defaultView;
+      browserWin.openUILinkIn(this.link, "tab");
+    }
+  },
+
+  /**
+   * Destroy this property view, removing event listeners
+   */
+  destroy: function () {
+    this.element.removeEventListener("dblclick", this.onMatchedToggle, false);
+    this.shortcuts.destroy();
+    this.element = null;
+
+    this.matchedExpander.removeEventListener("click", this.onMatchedToggle,
+                                             false);
+    this.matchedExpander = null;
+
+    this.nameNode.removeEventListener("click", this.onFocus, false);
+    this.nameNode = null;
+
+    this.valueNode.removeEventListener("click", this.onFocus, false);
+    this.valueNode = null;
+  }
+};
+
+/**
+ * A container to give us easy access to display data from a CssRule
+ *
+ * @param CssComputedView tree
+ *        the owning CssComputedView
+ * @param selectorInfo
+ */
+function SelectorView(tree, selectorInfo) {
+  this.tree = tree;
+  this.selectorInfo = selectorInfo;
+  this._cacheStatusNames();
+
+  this.openStyleEditor = this.openStyleEditor.bind(this);
+
+  this.ready = this.updateSourceLink();
+}
+
+/**
+ * Decode for cssInfo.rule.status
+ * @see SelectorView.prototype._cacheStatusNames
+ * @see CssLogic.STATUS
+ */
+SelectorView.STATUS_NAMES = [
+  // "Parent Match", "Matched", "Best Match"
+];
+
+SelectorView.CLASS_NAMES = [
+  "parentmatch", "matched", "bestmatch"
+];
+
+SelectorView.prototype = {
+  /**
+   * Cache localized status names.
+   *
+   * These statuses are localized inside the styleinspector.properties string
+   * bundle.
+   * @see css-logic.js - the CssLogic.STATUS array.
+   */
+  _cacheStatusNames: function () {
+    if (SelectorView.STATUS_NAMES.length) {
+      return;
+    }
+
+    for (let status in CssLogic.STATUS) {
+      let i = CssLogic.STATUS[status];
+      if (i > CssLogic.STATUS.UNMATCHED) {
+        let value = CssComputedView.l10n("rule.status." + status);
+        // Replace normal spaces with non-breaking spaces
+        SelectorView.STATUS_NAMES[i] = value.replace(/ /g, "\u00A0");
+      }
+    }
+  },
+
+  /**
+   * A localized version of cssRule.status
+   */
+  get statusText() {
+    return SelectorView.STATUS_NAMES[this.selectorInfo.status];
+  },
+
+  /**
+   * Get class name for selector depending on status
+   */
+  get statusClass() {
+    return SelectorView.CLASS_NAMES[this.selectorInfo.status - 1];
+  },
+
+  get href() {
+    if (this._href) {
+      return this._href;
+    }
+    let sheet = this.selectorInfo.rule.parentStyleSheet;
+    this._href = sheet ? sheet.href : "#";
+    return this._href;
+  },
+
+  get sourceText() {
+    return this.selectorInfo.sourceText;
+  },
+
+  get value() {
+    return this.selectorInfo.value;
+  },
+
+  get outputFragment() {
+    // Sadly, because this fragment is added to the template by DOM Templater
+    // we lose any events that are attached. This means that URLs will open in a
+    // new window. At some point we should fix this by stopping using the
+    // templater.
+    let outputParser = this.tree._outputParser;
+    let frag = outputParser.parseCssProperty(
+      this.selectorInfo.name,
+      this.selectorInfo.value, {
+        colorSwatchClass: "computedview-colorswatch",
+        colorClass: "computedview-color",
+        urlClass: "theme-link",
+        baseURI: this.selectorInfo.rule.href
+      }
+    );
+    return frag;
+  },
+
+  /**
+   * Update the text of the source link to reflect whether we're showing
+   * original sources or not.
+   */
+  updateSourceLink: function () {
+    return this.updateSource().then((oldSource) => {
+      if (oldSource !== this.source && this.tree.element) {
+        let selector = '[sourcelocation="' + oldSource + '"]';
+        let link = this.tree.element.querySelector(selector);
+        if (link) {
+          link.textContent = this.source;
+          link.setAttribute("sourcelocation", this.source);
+        }
+      }
+    });
+  },
+
+  /**
+   * Update the 'source' store based on our original sources preference.
+   */
+  updateSource: function () {
+    let rule = this.selectorInfo.rule;
+    this.sheet = rule.parentStyleSheet;
+
+    if (!rule || !this.sheet) {
+      let oldSource = this.source;
+      this.source = CssLogic.l10n("rule.sourceElement");
+      return promise.resolve(oldSource);
+    }
+
+    let showOrig = Services.prefs.getBoolPref(PREF_ORIG_SOURCES);
+
+    if (showOrig && rule.type !== ELEMENT_STYLE) {
+      let deferred = defer();
+
+      // set as this first so we show something while we're fetching
+      this.source = CssLogic.shortSource(this.sheet) + ":" + rule.line;
+
+      rule.getOriginalLocation().then(({href, line}) => {
+        let oldSource = this.source;
+        this.source = CssLogic.shortSource({href: href}) + ":" + line;
+        deferred.resolve(oldSource);
+      });
+
+      return deferred.promise;
+    }
+
+    let oldSource = this.source;
+    this.source = CssLogic.shortSource(this.sheet) + ":" + rule.line;
+    return promise.resolve(oldSource);
+  },
+
+  /**
+   * When a css link is clicked this method is called in order to either:
+   *   1. Open the link in view source (for chrome stylesheets).
+   *   2. Open the link in the style editor.
+   *
+   *   We can only view stylesheets contained in document.styleSheets inside the
+   *   style editor.
+   */
+  openStyleEditor: function () {
+    let inspector = this.tree.inspector;
+    let rule = this.selectorInfo.rule;
+
+    // The style editor can only display stylesheets coming from content because
+    // chrome stylesheets are not listed in the editor's stylesheet selector.
+    //
+    // If the stylesheet is a content stylesheet we send it to the style
+    // editor else we display it in the view source window.
+    let parentStyleSheet = rule.parentStyleSheet;
+    if (!parentStyleSheet || parentStyleSheet.isSystem) {
+      let toolbox = gDevTools.getToolbox(inspector.target);
+      toolbox.viewSource(rule.href, rule.line);
+      return;
+    }
+
+    let location = promise.resolve(rule.location);
+    if (Services.prefs.getBoolPref(PREF_ORIG_SOURCES)) {
+      location = rule.getOriginalLocation();
+    }
+
+    location.then(({source, href, line, column}) => {
+      let target = inspector.target;
+      if (ToolDefinitions.styleEditor.isTargetSupported(target)) {
+        gDevTools.showToolbox(target, "styleeditor").then(function (toolbox) {
+          let sheet = source || href;
+          toolbox.getCurrentPanel().selectStyleSheet(sheet, line, column);
+        });
+      }
+    });
+  }
+};
+
+function ComputedViewTool(inspector, window) {
+  this.inspector = inspector;
+  this.document = window.document;
+
+  this.computedView = new CssComputedView(this.inspector, this.document,
+    this.inspector.pageStyle);
+  this.boxModelView = new BoxModelView(this.inspector, this.document);
+
+  this.onSelected = this.onSelected.bind(this);
+  this.refresh = this.refresh.bind(this);
+  this.onPanelSelected = this.onPanelSelected.bind(this);
+  this.onMutations = this.onMutations.bind(this);
+  this.onResized = this.onResized.bind(this);
+
+  this.inspector.selection.on("detached-front", this.onSelected);
+  this.inspector.selection.on("new-node-front", this.onSelected);
+  this.inspector.selection.on("pseudoclass", this.refresh);
+  this.inspector.sidebar.on("computedview-selected", this.onPanelSelected);
+  this.inspector.pageStyle.on("stylesheet-updated", this.refresh);
+  this.inspector.walker.on("mutations", this.onMutations);
+  this.inspector.walker.on("resize", this.onResized);
+
+  this.computedView.selectElement(null);
+
+  this.onSelected();
+}
+
+ComputedViewTool.prototype = {
+  isSidebarActive: function () {
+    if (!this.computedView) {
+      return false;
+    }
+    return this.inspector.sidebar.getCurrentTabID() == "computedview";
+  },
+
+  onSelected: function (event) {
+    // Ignore the event if the view has been destroyed, or if it's inactive.
+    // But only if the current selection isn't null. If it's been set to null,
+    // let the update go through as this is needed to empty the view on
+    // navigation.
+    if (!this.computedView) {
+      return;
+    }
+
+    let isInactive = !this.isSidebarActive() &&
+                     this.inspector.selection.nodeFront;
+    if (isInactive) {
+      return;
+    }
+
+    this.computedView.setPageStyle(this.inspector.pageStyle);
+
+    if (!this.inspector.selection.isConnected() ||
+        !this.inspector.selection.isElementNode()) {
+      this.computedView.selectElement(null);
+      return;
+    }
+
+    if (!event || event == "new-node-front") {
+      let done = this.inspector.updating("computed-view");
+      this.computedView.selectElement(this.inspector.selection.nodeFront).then(() => {
+        done();
+      });
+    }
+  },
+
+  refresh: function () {
+    if (this.isSidebarActive()) {
+      this.computedView.refreshPanel();
+    }
+  },
+
+  onPanelSelected: function () {
+    if (this.inspector.selection.nodeFront === this.computedView._viewedElement) {
+      this.refresh();
+    } else {
+      this.onSelected();
+    }
+  },
+
+  /**
+   * When markup mutations occur, if an attribute of the selected node changes,
+   * we need to refresh the view as that might change the node's styles.
+   */
+  onMutations: function (mutations) {
+    for (let {type, target} of mutations) {
+      if (target === this.inspector.selection.nodeFront &&
+          type === "attributes") {
+        this.refresh();
+        break;
+      }
+    }
+  },
+
+  /**
+   * When the window gets resized, this may cause media-queries to match, and
+   * therefore, different styles may apply.
+   */
+  onResized: function () {
+    this.refresh();
+  },
+
+  destroy: function () {
+    this.inspector.walker.off("mutations", this.onMutations);
+    this.inspector.walker.off("resize", this.onResized);
+    this.inspector.sidebar.off("computedview-selected", this.refresh);
+    this.inspector.selection.off("pseudoclass", this.refresh);
+    this.inspector.selection.off("new-node-front", this.onSelected);
+    this.inspector.selection.off("detached-front", this.onSelected);
+    this.inspector.sidebar.off("computedview-selected", this.onPanelSelected);
+    if (this.inspector.pageStyle) {
+      this.inspector.pageStyle.off("stylesheet-updated", this.refresh);
+    }
+
+    this.computedView.destroy();
+    this.boxModelView.destroy();
+
+    this.computedView = this.boxModelView = this.document = this.inspector = null;
+  }
+};
+
+exports.CssComputedView = CssComputedView;
+exports.ComputedViewTool = ComputedViewTool;
+exports.PropertyView = PropertyView;