Add m-esr52 at 52.6.0

1 files changed, 841 insertions, 0 deletions

diff --git a/devtools/client/inspector/components/box-model.js b/devtools/client/inspector/components/box-model.js
new file mode 100644
index 000000000..fc36fac71
--- /dev/null
+++ b/devtools/client/inspector/components/box-model.js
@@ -0,0 +1,841 @@
+/* -*- 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/. */
+
+"use strict";
+
+const {Task} = require("devtools/shared/task");
+const {InplaceEditor, editableItem} =
+      require("devtools/client/shared/inplace-editor");
+const {ReflowFront} = require("devtools/shared/fronts/reflow");
+const {LocalizationHelper} = require("devtools/shared/l10n");
+const {getCssProperties} = require("devtools/shared/fronts/css-properties");
+
+const STRINGS_URI = "devtools/client/locales/shared.properties";
+const STRINGS_INSPECTOR = "devtools/shared/locales/styleinspector.properties";
+const SHARED_L10N = new LocalizationHelper(STRINGS_URI);
+const INSPECTOR_L10N = new LocalizationHelper(STRINGS_INSPECTOR);
+const NUMERIC = /^-?[\d\.]+$/;
+const LONG_TEXT_ROTATE_LIMIT = 3;
+
+/**
+ * An instance of EditingSession tracks changes that have been made during the
+ * modification of box model values. All of these changes can be reverted by
+ * calling revert. The main parameter is the BoxModelView that created it.
+ *
+ * @param inspector The inspector panel.
+ * @param doc       A DOM document that can be used to test style rules.
+ * @param rules     An array of the style rules defined for the node being
+ *                  edited. These should be in order of priority, least
+ *                  important first.
+ */
+function EditingSession({inspector, doc, elementRules}) {
+  this._doc = doc;
+  this._rules = elementRules;
+  this._modifications = new Map();
+  this._cssProperties = getCssProperties(inspector.toolbox);
+}
+
+EditingSession.prototype = {
+  /**
+   * Gets the value of a single property from the CSS rule.
+   *
+   * @param {StyleRuleFront} rule The CSS rule.
+   * @param {String} property The name of the property.
+   * @return {String} The value.
+   */
+  getPropertyFromRule: function (rule, property) {
+    // Use the parsed declarations in the StyleRuleFront object if available.
+    let index = this.getPropertyIndex(property, rule);
+    if (index !== -1) {
+      return rule.declarations[index].value;
+    }
+
+    // Fallback to parsing the cssText locally otherwise.
+    let dummyStyle = this._element.style;
+    dummyStyle.cssText = rule.cssText;
+    return dummyStyle.getPropertyValue(property);
+  },
+
+  /**
+   * Returns the current value for a property as a string or the empty string if
+   * no style rules affect the property.
+   *
+   * @param property  The name of the property as a string
+   */
+  getProperty: function (property) {
+    // Create a hidden element for getPropertyFromRule to use
+    let div = this._doc.createElement("div");
+    div.setAttribute("style", "display: none");
+    this._doc.getElementById("sidebar-panel-computedview").appendChild(div);
+    this._element = this._doc.createElement("p");
+    div.appendChild(this._element);
+
+    // As the rules are in order of priority we can just iterate until we find
+    // the first that defines a value for the property and return that.
+    for (let rule of this._rules) {
+      let value = this.getPropertyFromRule(rule, property);
+      if (value !== "") {
+        div.remove();
+        return value;
+      }
+    }
+    div.remove();
+    return "";
+  },
+
+  /**
+   * Get the index of a given css property name in a CSS rule.
+   * Or -1, if there are no properties in the rule yet.
+   * @param {String} name The property name.
+   * @param {StyleRuleFront} rule Optional, defaults to the element style rule.
+   * @return {Number} The property index in the rule.
+   */
+  getPropertyIndex: function (name, rule = this._rules[0]) {
+    let elementStyleRule = this._rules[0];
+    if (!elementStyleRule.declarations.length) {
+      return -1;
+    }
+
+    return elementStyleRule.declarations.findIndex(p => p.name === name);
+  },
+
+  /**
+   * Sets a number of properties on the node.
+   * @param properties  An array of properties, each is an object with name and
+   *                    value properties. If the value is "" then the property
+   *                    is removed.
+   * @return {Promise} Resolves when the modifications are complete.
+   */
+  setProperties: Task.async(function* (properties) {
+    for (let property of properties) {
+      // Get a RuleModificationList or RuleRewriter helper object from the
+      // StyleRuleActor to make changes to CSS properties.
+      // Note that RuleRewriter doesn't support modifying several properties at
+      // once, so we do this in a sequence here.
+      let modifications = this._rules[0].startModifyingProperties(
+        this._cssProperties);
+
+      // Remember the property so it can be reverted.
+      if (!this._modifications.has(property.name)) {
+        this._modifications.set(property.name,
+          this.getPropertyFromRule(this._rules[0], property.name));
+      }
+
+      // Find the index of the property to be changed, or get the next index to
+      // insert the new property at.
+      let index = this.getPropertyIndex(property.name);
+      if (index === -1) {
+        index = this._rules[0].declarations.length;
+      }
+
+      if (property.value == "") {
+        modifications.removeProperty(index, property.name);
+      } else {
+        modifications.setProperty(index, property.name, property.value, "");
+      }
+
+      yield modifications.apply();
+    }
+  }),
+
+  /**
+   * Reverts all of the property changes made by this instance.
+   * @return {Promise} Resolves when all properties have been reverted.
+   */
+  revert: Task.async(function* () {
+    // Revert each property that we modified previously, one by one. See
+    // setProperties for information about why.
+    for (let [property, value] of this._modifications) {
+      let modifications = this._rules[0].startModifyingProperties(
+        this._cssProperties);
+
+      // Find the index of the property to be reverted.
+      let index = this.getPropertyIndex(property);
+
+      if (value != "") {
+        // If the property doesn't exist anymore, insert at the beginning of the
+        // rule.
+        if (index === -1) {
+          index = 0;
+        }
+        modifications.setProperty(index, property, value, "");
+      } else {
+        // If the property doesn't exist anymore, no need to remove it. It had
+        // not been added after all.
+        if (index === -1) {
+          continue;
+        }
+        modifications.removeProperty(index, property);
+      }
+
+      yield modifications.apply();
+    }
+  }),
+
+  destroy: function () {
+    this._doc = null;
+    this._rules = null;
+    this._modifications.clear();
+  }
+};
+
+/**
+ * The box model view
+ * @param {InspectorPanel} inspector
+ *        An instance of the inspector-panel currently loaded in the toolbox
+ * @param {Document} document
+ *        The document that will contain the box model view.
+ */
+function BoxModelView(inspector, document) {
+  this.inspector = inspector;
+  this.doc = document;
+  this.wrapper = this.doc.getElementById("boxmodel-wrapper");
+  this.container = this.doc.getElementById("boxmodel-container");
+  this.expander = this.doc.getElementById("boxmodel-expander");
+  this.sizeLabel = this.doc.querySelector(".boxmodel-size > span");
+  this.sizeHeadingLabel = this.doc.getElementById("boxmodel-element-size");
+  this._geometryEditorHighlighter = null;
+  this._cssProperties = getCssProperties(inspector.toolbox);
+
+  this.init();
+}
+
+BoxModelView.prototype = {
+  init: function () {
+    this.update = this.update.bind(this);
+
+    this.onNewSelection = this.onNewSelection.bind(this);
+    this.inspector.selection.on("new-node-front", this.onNewSelection);
+
+    this.onNewNode = this.onNewNode.bind(this);
+    this.inspector.sidebar.on("computedview-selected", this.onNewNode);
+
+    this.onSidebarSelect = this.onSidebarSelect.bind(this);
+    this.inspector.sidebar.on("select", this.onSidebarSelect);
+
+    this.onToggleExpander = this.onToggleExpander.bind(this);
+    this.expander.addEventListener("click", this.onToggleExpander);
+    let header = this.doc.getElementById("boxmodel-header");
+    header.addEventListener("dblclick", this.onToggleExpander);
+
+    this.onFilterComputedView = this.onFilterComputedView.bind(this);
+    this.inspector.on("computed-view-filtered",
+      this.onFilterComputedView);
+
+    this.onPickerStarted = this.onPickerStarted.bind(this);
+    this.onMarkupViewLeave = this.onMarkupViewLeave.bind(this);
+    this.onMarkupViewNodeHover = this.onMarkupViewNodeHover.bind(this);
+    this.onWillNavigate = this.onWillNavigate.bind(this);
+
+    this.initBoxModelHighlighter();
+
+    // Store for the different dimensions of the node.
+    // 'selector' refers to the element that holds the value;
+    // 'property' is what we are measuring;
+    // 'value' is the computed dimension, computed in update().
+    this.map = {
+      position: {
+        selector: "#boxmodel-element-position",
+        property: "position",
+        value: undefined
+      },
+      marginTop: {
+        selector: ".boxmodel-margin.boxmodel-top > span",
+        property: "margin-top",
+        value: undefined
+      },
+      marginBottom: {
+        selector: ".boxmodel-margin.boxmodel-bottom > span",
+        property: "margin-bottom",
+        value: undefined
+      },
+      marginLeft: {
+        selector: ".boxmodel-margin.boxmodel-left > span",
+        property: "margin-left",
+        value: undefined
+      },
+      marginRight: {
+        selector: ".boxmodel-margin.boxmodel-right > span",
+        property: "margin-right",
+        value: undefined
+      },
+      paddingTop: {
+        selector: ".boxmodel-padding.boxmodel-top > span",
+        property: "padding-top",
+        value: undefined
+      },
+      paddingBottom: {
+        selector: ".boxmodel-padding.boxmodel-bottom > span",
+        property: "padding-bottom",
+        value: undefined
+      },
+      paddingLeft: {
+        selector: ".boxmodel-padding.boxmodel-left > span",
+        property: "padding-left",
+        value: undefined
+      },
+      paddingRight: {
+        selector: ".boxmodel-padding.boxmodel-right > span",
+        property: "padding-right",
+        value: undefined
+      },
+      borderTop: {
+        selector: ".boxmodel-border.boxmodel-top > span",
+        property: "border-top-width",
+        value: undefined
+      },
+      borderBottom: {
+        selector: ".boxmodel-border.boxmodel-bottom > span",
+        property: "border-bottom-width",
+        value: undefined
+      },
+      borderLeft: {
+        selector: ".boxmodel-border.boxmodel-left > span",
+        property: "border-left-width",
+        value: undefined
+      },
+      borderRight: {
+        selector: ".boxmodel-border.boxmodel-right > span",
+        property: "border-right-width",
+        value: undefined
+      }
+    };
+
+    // Make each element the dimensions editable
+    for (let i in this.map) {
+      if (i == "position") {
+        continue;
+      }
+
+      let dimension = this.map[i];
+      editableItem({
+        element: this.doc.querySelector(dimension.selector)
+      }, (element, event) => {
+        this.initEditor(element, event, dimension);
+      });
+    }
+
+    this.onNewNode();
+
+    let nodeGeometry = this.doc.getElementById("layout-geometry-editor");
+    this.onGeometryButtonClick = this.onGeometryButtonClick.bind(this);
+    nodeGeometry.addEventListener("click", this.onGeometryButtonClick);
+  },
+
+  initBoxModelHighlighter: function () {
+    let highlightElts = this.doc.querySelectorAll("#boxmodel-container *[title]");
+    this.onHighlightMouseOver = this.onHighlightMouseOver.bind(this);
+    this.onHighlightMouseOut = this.onHighlightMouseOut.bind(this);
+
+    for (let element of highlightElts) {
+      element.addEventListener("mouseover", this.onHighlightMouseOver, true);
+      element.addEventListener("mouseout", this.onHighlightMouseOut, true);
+    }
+  },
+
+  /**
+   * Start listening to reflows in the current tab.
+   */
+  trackReflows: function () {
+    if (!this.reflowFront) {
+      let { target } = this.inspector;
+      if (target.form.reflowActor) {
+        this.reflowFront = ReflowFront(target.client,
+                                       target.form);
+      } else {
+        return;
+      }
+    }
+
+    this.reflowFront.on("reflows", this.update);
+    this.reflowFront.start();
+  },
+
+  /**
+   * Stop listening to reflows in the current tab.
+   */
+  untrackReflows: function () {
+    if (!this.reflowFront) {
+      return;
+    }
+
+    this.reflowFront.off("reflows", this.update);
+    this.reflowFront.stop();
+  },
+
+  /**
+   * Called when the user clicks on one of the editable values in the box model view
+   */
+  initEditor: function (element, event, dimension) {
+    let { property } = dimension;
+    let session = new EditingSession(this);
+    let initialValue = session.getProperty(property);
+
+    let editor = new InplaceEditor({
+      element: element,
+      initial: initialValue,
+      contentType: InplaceEditor.CONTENT_TYPES.CSS_VALUE,
+      property: {
+        name: dimension.property
+      },
+      start: self => {
+        self.elt.parentNode.classList.add("boxmodel-editing");
+      },
+      change: value => {
+        if (NUMERIC.test(value)) {
+          value += "px";
+        }
+
+        let properties = [
+          { name: property, value: value }
+        ];
+
+        if (property.substring(0, 7) == "border-") {
+          let bprop = property.substring(0, property.length - 5) + "style";
+          let style = session.getProperty(bprop);
+          if (!style || style == "none" || style == "hidden") {
+            properties.push({ name: bprop, value: "solid" });
+          }
+        }
+
+        session.setProperties(properties).catch(e => console.error(e));
+      },
+      done: (value, commit) => {
+        editor.elt.parentNode.classList.remove("boxmodel-editing");
+        if (!commit) {
+          session.revert().then(() => {
+            session.destroy();
+          }, e => console.error(e));
+        }
+      },
+      contextMenu: this.inspector.onTextBoxContextMenu,
+      cssProperties: this._cssProperties
+    }, event);
+  },
+
+  /**
+   * Is the BoxModelView visible in the sidebar.
+   * @return {Boolean}
+   */
+  isViewVisible: function () {
+    return this.inspector &&
+           this.inspector.sidebar.getCurrentTabID() == "computedview";
+  },
+
+  /**
+   * Is the BoxModelView visible in the sidebar and is the current node valid to
+   * be displayed in the view.
+   * @return {Boolean}
+   */
+  isViewVisibleAndNodeValid: function () {
+    return this.isViewVisible() &&
+           this.inspector.selection.isConnected() &&
+           this.inspector.selection.isElementNode();
+  },
+
+  /**
+   * Destroy the nodes. Remove listeners.
+   */
+  destroy: function () {
+    let highlightElts = this.doc.querySelectorAll("#boxmodel-container *[title]");
+
+    for (let element of highlightElts) {
+      element.removeEventListener("mouseover", this.onHighlightMouseOver, true);
+      element.removeEventListener("mouseout", this.onHighlightMouseOut, true);
+    }
+
+    this.expander.removeEventListener("click", this.onToggleExpander);
+    let header = this.doc.getElementById("boxmodel-header");
+    header.removeEventListener("dblclick", this.onToggleExpander);
+
+    let nodeGeometry = this.doc.getElementById("layout-geometry-editor");
+    nodeGeometry.removeEventListener("click", this.onGeometryButtonClick);
+
+    this.inspector.off("picker-started", this.onPickerStarted);
+
+    // Inspector Panel will destroy `markup` object on "will-navigate" event,
+    // therefore we have to check if it's still available in case BoxModelView
+    // is destroyed immediately after.
+    if (this.inspector.markup) {
+      this.inspector.markup.off("leave", this.onMarkupViewLeave);
+      this.inspector.markup.off("node-hover", this.onMarkupViewNodeHover);
+    }
+
+    this.inspector.sidebar.off("computedview-selected", this.onNewNode);
+    this.inspector.selection.off("new-node-front", this.onNewSelection);
+    this.inspector.sidebar.off("select", this.onSidebarSelect);
+    this.inspector.target.off("will-navigate", this.onWillNavigate);
+    this.inspector.off("computed-view-filtered", this.onFilterComputedView);
+
+    this.inspector = null;
+    this.doc = null;
+    this.wrapper = null;
+    this.container = null;
+    this.expander = null;
+    this.sizeLabel = null;
+    this.sizeHeadingLabel = null;
+
+    if (this.reflowFront) {
+      this.untrackReflows();
+      this.reflowFront.destroy();
+      this.reflowFront = null;
+    }
+  },
+
+  onSidebarSelect: function (e, sidebar) {
+    this.setActive(sidebar === "computedview");
+  },
+
+  /**
+   * Selection 'new-node-front' event handler.
+   */
+  onNewSelection: function () {
+    let done = this.inspector.updating("computed-view");
+    this.onNewNode()
+      .then(() => this.hideGeometryEditor())
+      .then(done, (err) => {
+        console.error(err);
+        done();
+      }).catch(console.error);
+  },
+
+  /**
+   * @return a promise that resolves when the view has been updated
+   */
+  onNewNode: function () {
+    this.setActive(this.isViewVisibleAndNodeValid());
+    return this.update();
+  },
+
+  onHighlightMouseOver: function (e) {
+    let region = e.target.getAttribute("data-box");
+    if (!region) {
+      return;
+    }
+
+    this.showBoxModel({
+      region,
+      showOnly: region,
+      onlyRegionArea: true
+    });
+  },
+
+  onHighlightMouseOut: function () {
+    this.hideBoxModel();
+  },
+
+  onGeometryButtonClick: function ({target}) {
+    if (target.hasAttribute("checked")) {
+      target.removeAttribute("checked");
+      this.hideGeometryEditor();
+    } else {
+      target.setAttribute("checked", "true");
+      this.showGeometryEditor();
+    }
+  },
+
+  onPickerStarted: function () {
+    this.hideGeometryEditor();
+  },
+
+  onToggleExpander: function () {
+    let isOpen = this.expander.hasAttribute("open");
+
+    if (isOpen) {
+      this.container.hidden = true;
+      this.expander.removeAttribute("open");
+    } else {
+      this.container.hidden = false;
+      this.expander.setAttribute("open", "");
+    }
+  },
+
+  onMarkupViewLeave: function () {
+    this.showGeometryEditor(true);
+  },
+
+  onMarkupViewNodeHover: function () {
+    this.hideGeometryEditor(false);
+  },
+
+  onWillNavigate: function () {
+    this._geometryEditorHighlighter.release().catch(console.error);
+    this._geometryEditorHighlighter = null;
+  },
+
+  /**
+   * Event handler that responds to the computed view being filtered
+   * @param {String} reason
+   * @param {Boolean} hidden
+   *        Whether or not to hide the box model wrapper
+   */
+  onFilterComputedView: function (reason, hidden) {
+    this.wrapper.hidden = hidden;
+  },
+
+  /**
+   * Stop tracking reflows and hide all values when no node is selected or the
+   * box model view is hidden, otherwise track reflows and show values.
+   * @param {Boolean} isActive
+   */
+  setActive: function (isActive) {
+    if (isActive === this.isActive) {
+      return;
+    }
+    this.isActive = isActive;
+
+    if (isActive) {
+      this.trackReflows();
+    } else {
+      this.untrackReflows();
+    }
+  },
+
+  /**
+   * Compute the dimensions of the node and update the values in
+   * the inspector.xul document.
+   * @return a promise that will be resolved when complete.
+   */
+  update: function () {
+    let lastRequest = Task.spawn((function* () {
+      if (!this.isViewVisibleAndNodeValid()) {
+        this.wrapper.hidden = true;
+        this.inspector.emit("boxmodel-view-updated");
+        return null;
+      }
+
+      let node = this.inspector.selection.nodeFront;
+      let layout = yield this.inspector.pageStyle.getLayout(node, {
+        autoMargins: this.isActive
+      });
+      let styleEntries = yield this.inspector.pageStyle.getApplied(node, {});
+
+      yield this.updateGeometryButton();
+
+      // If a subsequent request has been made, wait for that one instead.
+      if (this._lastRequest != lastRequest) {
+        return this._lastRequest;
+      }
+
+      this._lastRequest = null;
+      let width = layout.width;
+      let height = layout.height;
+      let newLabel = SHARED_L10N.getFormatStr("dimensions", width, height);
+
+      if (this.sizeHeadingLabel.textContent != newLabel) {
+        this.sizeHeadingLabel.textContent = newLabel;
+      }
+
+      for (let i in this.map) {
+        let property = this.map[i].property;
+        if (!(property in layout)) {
+          // Depending on the actor version, some properties
+          // might be missing.
+          continue;
+        }
+        let parsedValue = parseFloat(layout[property]);
+        if (Number.isNaN(parsedValue)) {
+          // Not a number. We use the raw string.
+          // Useful for "position" for example.
+          this.map[i].value = layout[property];
+        } else {
+          this.map[i].value = parsedValue;
+        }
+      }
+
+      let margins = layout.autoMargins;
+      if ("top" in margins) {
+        this.map.marginTop.value = "auto";
+      }
+      if ("right" in margins) {
+        this.map.marginRight.value = "auto";
+      }
+      if ("bottom" in margins) {
+        this.map.marginBottom.value = "auto";
+      }
+      if ("left" in margins) {
+        this.map.marginLeft.value = "auto";
+      }
+
+      for (let i in this.map) {
+        let selector = this.map[i].selector;
+        let span = this.doc.querySelector(selector);
+        this.updateSourceRuleTooltip(span, this.map[i].property, styleEntries);
+        if (span.textContent.length > 0 &&
+            span.textContent == this.map[i].value) {
+          continue;
+        }
+        span.textContent = this.map[i].value;
+        this.manageOverflowingText(span);
+      }
+
+      width -= this.map.borderLeft.value + this.map.borderRight.value +
+               this.map.paddingLeft.value + this.map.paddingRight.value;
+      width = parseFloat(width.toPrecision(6));
+      height -= this.map.borderTop.value + this.map.borderBottom.value +
+                this.map.paddingTop.value + this.map.paddingBottom.value;
+      height = parseFloat(height.toPrecision(6));
+
+      let newValue = width + "\u00D7" + height;
+      if (this.sizeLabel.textContent != newValue) {
+        this.sizeLabel.textContent = newValue;
+      }
+
+      this.elementRules = styleEntries.map(e => e.rule);
+
+      this.wrapper.hidden = false;
+
+      this.inspector.emit("boxmodel-view-updated");
+      return null;
+    }).bind(this)).catch(console.error);
+
+    this._lastRequest = lastRequest;
+    return this._lastRequest;
+  },
+
+  /**
+   * Update the text in the tooltip shown when hovering over a value to provide
+   * information about the source CSS rule that sets this value.
+   * @param {DOMNode} el The element that will receive the tooltip.
+   * @param {String} property The name of the CSS property for the tooltip.
+   * @param {Array} rules An array of applied rules retrieved by
+   * styleActor.getApplied.
+   */
+  updateSourceRuleTooltip: function (el, property, rules) {
+    // Dummy element used to parse the cssText of applied rules.
+    let dummyEl = this.doc.createElement("div");
+
+    // Rules are in order of priority so iterate until we find the first that
+    // defines a value for the property.
+    let sourceRule, value;
+    for (let {rule} of rules) {
+      dummyEl.style.cssText = rule.cssText;
+      value = dummyEl.style.getPropertyValue(property);
+      if (value !== "") {
+        sourceRule = rule;
+        break;
+      }
+    }
+
+    let title = property;
+    if (sourceRule && sourceRule.selectors) {
+      title += "\n" + sourceRule.selectors.join(", ");
+    }
+    if (sourceRule && sourceRule.parentStyleSheet) {
+      if (sourceRule.parentStyleSheet.href) {
+        title += "\n" + sourceRule.parentStyleSheet.href + ":" + sourceRule.line;
+      } else {
+        title += "\n" + INSPECTOR_L10N.getStr("rule.sourceInline") +
+          ":" + sourceRule.line;
+      }
+    }
+
+    el.setAttribute("title", title);
+  },
+
+  /**
+   * Show the box-model highlighter on the currently selected element
+   * @param {Object} options Options passed to the highlighter actor
+   */
+  showBoxModel: function (options = {}) {
+    let toolbox = this.inspector.toolbox;
+    let nodeFront = this.inspector.selection.nodeFront;
+
+    toolbox.highlighterUtils.highlightNodeFront(nodeFront, options);
+  },
+
+  /**
+   * Hide the box-model highlighter on the currently selected element
+   */
+  hideBoxModel: function () {
+    let toolbox = this.inspector.toolbox;
+
+    toolbox.highlighterUtils.unhighlight();
+  },
+
+  /**
+   * Show the geometry editor highlighter on the currently selected element
+   * @param {Boolean} [showOnlyIfActive=false]
+   *   Indicates if the Geometry Editor should be shown only if it's active but
+   *   hidden.
+   */
+  showGeometryEditor: function (showOnlyIfActive = false) {
+    let toolbox = this.inspector.toolbox;
+    let nodeFront = this.inspector.selection.nodeFront;
+    let nodeGeometry = this.doc.getElementById("layout-geometry-editor");
+    let isActive = nodeGeometry.hasAttribute("checked");
+
+    if (showOnlyIfActive && !isActive) {
+      return;
+    }
+
+    if (this._geometryEditorHighlighter) {
+      this._geometryEditorHighlighter.show(nodeFront).catch(console.error);
+      return;
+    }
+
+    // instantiate Geometry Editor highlighter
+    toolbox.highlighterUtils
+      .getHighlighterByType("GeometryEditorHighlighter").then(highlighter => {
+        highlighter.show(nodeFront).catch(console.error);
+        this._geometryEditorHighlighter = highlighter;
+
+        // Hide completely the geometry editor if the picker is clicked
+        toolbox.on("picker-started", this.onPickerStarted);
+
+        // Temporary hide the geometry editor
+        this.inspector.markup.on("leave", this.onMarkupViewLeave);
+        this.inspector.markup.on("node-hover", this.onMarkupViewNodeHover);
+
+        // Release the actor on will-navigate event
+        this.inspector.target.once("will-navigate", this.onWillNavigate);
+      });
+  },
+
+  /**
+   * Hide the geometry editor highlighter on the currently selected element
+   * @param {Boolean} [updateButton=true]
+   *   Indicates if the Geometry Editor's button needs to be unchecked too
+   */
+  hideGeometryEditor: function (updateButton = true) {
+    if (this._geometryEditorHighlighter) {
+      this._geometryEditorHighlighter.hide().catch(console.error);
+    }
+
+    if (updateButton) {
+      let nodeGeometry = this.doc.getElementById("layout-geometry-editor");
+      nodeGeometry.removeAttribute("checked");
+    }
+  },
+
+  /**
+   * Update the visibility and the state of the geometry editor button,
+   * based on the selected node.
+   */
+  updateGeometryButton: Task.async(function* () {
+    let node = this.inspector.selection.nodeFront;
+    let isEditable = false;
+
+    if (node) {
+      isEditable = yield this.inspector.pageStyle.isPositionEditable(node);
+    }
+
+    let nodeGeometry = this.doc.getElementById("layout-geometry-editor");
+    nodeGeometry.style.visibility = isEditable ? "visible" : "hidden";
+  }),
+
+  manageOverflowingText: function (span) {
+    let classList = span.parentNode.classList;
+
+    if (classList.contains("boxmodel-left") ||
+        classList.contains("boxmodel-right")) {
+      let force = span.textContent.length > LONG_TEXT_ROTATE_LIMIT;
+      classList.toggle("boxmodel-rotate", force);
+    }
+  }
+};
+
+exports.BoxModelView = BoxModelView;