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authorMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
committerMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
commit5f8de423f190bbb79a62f804151bc24824fa32d8 (patch)
tree10027f336435511475e392454359edea8e25895d /devtools/server/actors/highlighters/box-model.js
parent49ee0794b5d912db1f95dce6eb52d781dc210db5 (diff)
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Add m-esr52 at 52.6.0
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+ /* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+"use strict";
+
+const { extend } = require("sdk/core/heritage");
+const { AutoRefreshHighlighter } = require("./auto-refresh");
+const {
+ CanvasFrameAnonymousContentHelper,
+ createNode,
+ createSVGNode,
+ getBindingElementAndPseudo,
+ hasPseudoClassLock,
+ isNodeValid,
+ moveInfobar,
+} = require("./utils/markup");
+const { setIgnoreLayoutChanges } = require("devtools/shared/layout/utils");
+const inspector = require("devtools/server/actors/inspector");
+const nodeConstants = require("devtools/shared/dom-node-constants");
+
+// Note that the order of items in this array is important because it is used
+// for drawing the BoxModelHighlighter's path elements correctly.
+const BOX_MODEL_REGIONS = ["margin", "border", "padding", "content"];
+const BOX_MODEL_SIDES = ["top", "right", "bottom", "left"];
+// Width of boxmodelhighlighter guides
+const GUIDE_STROKE_WIDTH = 1;
+// FIXME: add ":visited" and ":link" after bug 713106 is fixed
+const PSEUDO_CLASSES = [":hover", ":active", ":focus"];
+
+/**
+ * The BoxModelHighlighter draws the box model regions on top of a node.
+ * If the node is a block box, then each region will be displayed as 1 polygon.
+ * If the node is an inline box though, each region may be represented by 1 or
+ * more polygons, depending on how many line boxes the inline element has.
+ *
+ * Usage example:
+ *
+ * let h = new BoxModelHighlighter(env);
+ * h.show(node, options);
+ * h.hide();
+ * h.destroy();
+ *
+ * Available options:
+ * - region {String}
+ * "content", "padding", "border" or "margin"
+ * This specifies the region that the guides should outline.
+ * Defaults to "content"
+ * - hideGuides {Boolean}
+ * Defaults to false
+ * - hideInfoBar {Boolean}
+ * Defaults to false
+ * - showOnly {String}
+ * "content", "padding", "border" or "margin"
+ * If set, only this region will be highlighted. Use with onlyRegionArea to
+ * only highlight the area of the region.
+ * - onlyRegionArea {Boolean}
+ * This can be set to true to make each region's box only highlight the area
+ * of the corresponding region rather than the area of nested regions too.
+ * This is useful when used with showOnly.
+ *
+ * Structure:
+ * <div class="highlighter-container">
+ * <div class="box-model-root">
+ * <svg class="box-model-elements" hidden="true">
+ * <g class="box-model-regions">
+ * <path class="box-model-margin" points="..." />
+ * <path class="box-model-border" points="..." />
+ * <path class="box-model-padding" points="..." />
+ * <path class="box-model-content" points="..." />
+ * </g>
+ * <line class="box-model-guide-top" x1="..." y1="..." x2="..." y2="..." />
+ * <line class="box-model-guide-right" x1="..." y1="..." x2="..." y2="..." />
+ * <line class="box-model-guide-bottom" x1="..." y1="..." x2="..." y2="..." />
+ * <line class="box-model-guide-left" x1="..." y1="..." x2="..." y2="..." />
+ * </svg>
+ * <div class="box-model-infobar-container">
+ * <div class="box-model-infobar-arrow highlighter-infobar-arrow-top" />
+ * <div class="box-model-infobar">
+ * <div class="box-model-infobar-text" align="center">
+ * <span class="box-model-infobar-tagname">Node name</span>
+ * <span class="box-model-infobar-id">Node id</span>
+ * <span class="box-model-infobar-classes">.someClass</span>
+ * <span class="box-model-infobar-pseudo-classes">:hover</span>
+ * </div>
+ * </div>
+ * <div class="box-model-infobar-arrow box-model-infobar-arrow-bottom"/>
+ * </div>
+ * </div>
+ * </div>
+ */
+function BoxModelHighlighter(highlighterEnv) {
+ AutoRefreshHighlighter.call(this, highlighterEnv);
+
+ this.markup = new CanvasFrameAnonymousContentHelper(this.highlighterEnv,
+ this._buildMarkup.bind(this));
+
+ /**
+ * Optionally customize each region's fill color by adding an entry to the
+ * regionFill property: `highlighter.regionFill.margin = "red";
+ */
+ this.regionFill = {};
+
+ this.onWillNavigate = this.onWillNavigate.bind(this);
+
+ this.highlighterEnv.on("will-navigate", this.onWillNavigate);
+}
+
+BoxModelHighlighter.prototype = extend(AutoRefreshHighlighter.prototype, {
+ typeName: "BoxModelHighlighter",
+
+ ID_CLASS_PREFIX: "box-model-",
+
+ _buildMarkup: function () {
+ let doc = this.win.document;
+
+ let highlighterContainer = doc.createElement("div");
+ highlighterContainer.className = "highlighter-container box-model";
+
+ // Build the root wrapper, used to adapt to the page zoom.
+ let rootWrapper = createNode(this.win, {
+ parent: highlighterContainer,
+ attributes: {
+ "id": "root",
+ "class": "root"
+ },
+ prefix: this.ID_CLASS_PREFIX
+ });
+
+ // Building the SVG element with its polygons and lines
+
+ let svg = createSVGNode(this.win, {
+ nodeType: "svg",
+ parent: rootWrapper,
+ attributes: {
+ "id": "elements",
+ "width": "100%",
+ "height": "100%",
+ "hidden": "true"
+ },
+ prefix: this.ID_CLASS_PREFIX
+ });
+
+ let regions = createSVGNode(this.win, {
+ nodeType: "g",
+ parent: svg,
+ attributes: {
+ "class": "regions"
+ },
+ prefix: this.ID_CLASS_PREFIX
+ });
+
+ for (let region of BOX_MODEL_REGIONS) {
+ createSVGNode(this.win, {
+ nodeType: "path",
+ parent: regions,
+ attributes: {
+ "class": region,
+ "id": region
+ },
+ prefix: this.ID_CLASS_PREFIX
+ });
+ }
+
+ for (let side of BOX_MODEL_SIDES) {
+ createSVGNode(this.win, {
+ nodeType: "line",
+ parent: svg,
+ attributes: {
+ "class": "guide-" + side,
+ "id": "guide-" + side,
+ "stroke-width": GUIDE_STROKE_WIDTH
+ },
+ prefix: this.ID_CLASS_PREFIX
+ });
+ }
+
+ // Building the nodeinfo bar markup
+
+ let infobarContainer = createNode(this.win, {
+ parent: rootWrapper,
+ attributes: {
+ "class": "infobar-container",
+ "id": "infobar-container",
+ "position": "top",
+ "hidden": "true"
+ },
+ prefix: this.ID_CLASS_PREFIX
+ });
+
+ let infobar = createNode(this.win, {
+ parent: infobarContainer,
+ attributes: {
+ "class": "infobar"
+ },
+ prefix: this.ID_CLASS_PREFIX
+ });
+
+ let texthbox = createNode(this.win, {
+ parent: infobar,
+ attributes: {
+ "class": "infobar-text"
+ },
+ prefix: this.ID_CLASS_PREFIX
+ });
+ createNode(this.win, {
+ nodeType: "span",
+ parent: texthbox,
+ attributes: {
+ "class": "infobar-tagname",
+ "id": "infobar-tagname"
+ },
+ prefix: this.ID_CLASS_PREFIX
+ });
+ createNode(this.win, {
+ nodeType: "span",
+ parent: texthbox,
+ attributes: {
+ "class": "infobar-id",
+ "id": "infobar-id"
+ },
+ prefix: this.ID_CLASS_PREFIX
+ });
+ createNode(this.win, {
+ nodeType: "span",
+ parent: texthbox,
+ attributes: {
+ "class": "infobar-classes",
+ "id": "infobar-classes"
+ },
+ prefix: this.ID_CLASS_PREFIX
+ });
+ createNode(this.win, {
+ nodeType: "span",
+ parent: texthbox,
+ attributes: {
+ "class": "infobar-pseudo-classes",
+ "id": "infobar-pseudo-classes"
+ },
+ prefix: this.ID_CLASS_PREFIX
+ });
+ createNode(this.win, {
+ nodeType: "span",
+ parent: texthbox,
+ attributes: {
+ "class": "infobar-dimensions",
+ "id": "infobar-dimensions"
+ },
+ prefix: this.ID_CLASS_PREFIX
+ });
+
+ return highlighterContainer;
+ },
+
+ /**
+ * Destroy the nodes. Remove listeners.
+ */
+ destroy: function () {
+ this.highlighterEnv.off("will-navigate", this.onWillNavigate);
+ this.markup.destroy();
+ AutoRefreshHighlighter.prototype.destroy.call(this);
+ },
+
+ getElement: function (id) {
+ return this.markup.getElement(this.ID_CLASS_PREFIX + id);
+ },
+
+ /**
+ * Override the AutoRefreshHighlighter's _isNodeValid method to also return true for
+ * text nodes since these can also be highlighted.
+ * @param {DOMNode} node
+ * @return {Boolean}
+ */
+ _isNodeValid: function (node) {
+ return node && (isNodeValid(node) || isNodeValid(node, nodeConstants.TEXT_NODE));
+ },
+
+ /**
+ * Show the highlighter on a given node
+ */
+ _show: function () {
+ if (BOX_MODEL_REGIONS.indexOf(this.options.region) == -1) {
+ this.options.region = "content";
+ }
+
+ let shown = this._update();
+ this._trackMutations();
+ this.emit("ready");
+ return shown;
+ },
+
+ /**
+ * Track the current node markup mutations so that the node info bar can be
+ * updated to reflects the node's attributes
+ */
+ _trackMutations: function () {
+ if (isNodeValid(this.currentNode)) {
+ let win = this.currentNode.ownerDocument.defaultView;
+ this.currentNodeObserver = new win.MutationObserver(this.update);
+ this.currentNodeObserver.observe(this.currentNode, {attributes: true});
+ }
+ },
+
+ _untrackMutations: function () {
+ if (isNodeValid(this.currentNode) && this.currentNodeObserver) {
+ this.currentNodeObserver.disconnect();
+ this.currentNodeObserver = null;
+ }
+ },
+
+ /**
+ * Update the highlighter on the current highlighted node (the one that was
+ * passed as an argument to show(node)).
+ * Should be called whenever node size or attributes change
+ */
+ _update: function () {
+ let shown = false;
+ setIgnoreLayoutChanges(true);
+
+ if (this._updateBoxModel()) {
+ // Show the infobar only if configured to do so and the node is an element or a text
+ // node.
+ if (!this.options.hideInfoBar && (
+ this.currentNode.nodeType === this.currentNode.ELEMENT_NODE ||
+ this.currentNode.nodeType === this.currentNode.TEXT_NODE)) {
+ this._showInfobar();
+ } else {
+ this._hideInfobar();
+ }
+ this._showBoxModel();
+ shown = true;
+ } else {
+ // Nothing to highlight (0px rectangle like a <script> tag for instance)
+ this._hide();
+ }
+
+ setIgnoreLayoutChanges(false, this.highlighterEnv.window.document.documentElement);
+
+ return shown;
+ },
+
+ /**
+ * Hide the highlighter, the outline and the infobar.
+ */
+ _hide: function () {
+ setIgnoreLayoutChanges(true);
+
+ this._untrackMutations();
+ this._hideBoxModel();
+ this._hideInfobar();
+
+ setIgnoreLayoutChanges(false, this.highlighterEnv.window.document.documentElement);
+ },
+
+ /**
+ * Hide the infobar
+ */
+ _hideInfobar: function () {
+ this.getElement("infobar-container").setAttribute("hidden", "true");
+ },
+
+ /**
+ * Show the infobar
+ */
+ _showInfobar: function () {
+ this.getElement("infobar-container").removeAttribute("hidden");
+ this._updateInfobar();
+ },
+
+ /**
+ * Hide the box model
+ */
+ _hideBoxModel: function () {
+ this.getElement("elements").setAttribute("hidden", "true");
+ },
+
+ /**
+ * Show the box model
+ */
+ _showBoxModel: function () {
+ this.getElement("elements").removeAttribute("hidden");
+ },
+
+ /**
+ * Calculate an outer quad based on the quads returned by getAdjustedQuads.
+ * The BoxModelHighlighter may highlight more than one boxes, so in this case
+ * create a new quad that "contains" all of these quads.
+ * This is useful to position the guides and infobar.
+ * This may happen if the BoxModelHighlighter is used to highlight an inline
+ * element that spans line breaks.
+ * @param {String} region The box-model region to get the outer quad for.
+ * @return {Object} A quad-like object {p1,p2,p3,p4,bounds}
+ */
+ _getOuterQuad: function (region) {
+ let quads = this.currentQuads[region];
+ if (!quads.length) {
+ return null;
+ }
+
+ let quad = {
+ p1: {x: Infinity, y: Infinity},
+ p2: {x: -Infinity, y: Infinity},
+ p3: {x: -Infinity, y: -Infinity},
+ p4: {x: Infinity, y: -Infinity},
+ bounds: {
+ bottom: -Infinity,
+ height: 0,
+ left: Infinity,
+ right: -Infinity,
+ top: Infinity,
+ width: 0,
+ x: 0,
+ y: 0,
+ }
+ };
+
+ for (let q of quads) {
+ quad.p1.x = Math.min(quad.p1.x, q.p1.x);
+ quad.p1.y = Math.min(quad.p1.y, q.p1.y);
+ quad.p2.x = Math.max(quad.p2.x, q.p2.x);
+ quad.p2.y = Math.min(quad.p2.y, q.p2.y);
+ quad.p3.x = Math.max(quad.p3.x, q.p3.x);
+ quad.p3.y = Math.max(quad.p3.y, q.p3.y);
+ quad.p4.x = Math.min(quad.p4.x, q.p4.x);
+ quad.p4.y = Math.max(quad.p4.y, q.p4.y);
+
+ quad.bounds.bottom = Math.max(quad.bounds.bottom, q.bounds.bottom);
+ quad.bounds.top = Math.min(quad.bounds.top, q.bounds.top);
+ quad.bounds.left = Math.min(quad.bounds.left, q.bounds.left);
+ quad.bounds.right = Math.max(quad.bounds.right, q.bounds.right);
+ }
+ quad.bounds.x = quad.bounds.left;
+ quad.bounds.y = quad.bounds.top;
+ quad.bounds.width = quad.bounds.right - quad.bounds.left;
+ quad.bounds.height = quad.bounds.bottom - quad.bounds.top;
+
+ return quad;
+ },
+
+ /**
+ * Update the box model as per the current node.
+ *
+ * @return {boolean}
+ * True if the current node has a box model to be highlighted
+ */
+ _updateBoxModel: function () {
+ let options = this.options;
+ options.region = options.region || "content";
+
+ if (!this._nodeNeedsHighlighting()) {
+ this._hideBoxModel();
+ return false;
+ }
+
+ for (let i = 0; i < BOX_MODEL_REGIONS.length; i++) {
+ let boxType = BOX_MODEL_REGIONS[i];
+ let nextBoxType = BOX_MODEL_REGIONS[i + 1];
+ let box = this.getElement(boxType);
+
+ if (this.regionFill[boxType]) {
+ box.setAttribute("style", "fill:" + this.regionFill[boxType]);
+ } else {
+ box.setAttribute("style", "");
+ }
+
+ // Highlight all quads for this region by setting the "d" attribute of the
+ // corresponding <path>.
+ let path = [];
+ for (let j = 0; j < this.currentQuads[boxType].length; j++) {
+ let boxQuad = this.currentQuads[boxType][j];
+ let nextBoxQuad = this.currentQuads[nextBoxType]
+ ? this.currentQuads[nextBoxType][j]
+ : null;
+ path.push(this._getBoxPathCoordinates(boxQuad, nextBoxQuad));
+ }
+
+ box.setAttribute("d", path.join(" "));
+ box.removeAttribute("faded");
+
+ // If showOnly is defined, either hide the other regions, or fade them out
+ // if onlyRegionArea is set too.
+ if (options.showOnly && options.showOnly !== boxType) {
+ if (options.onlyRegionArea) {
+ box.setAttribute("faded", "true");
+ } else {
+ box.removeAttribute("d");
+ }
+ }
+
+ if (boxType === options.region && !options.hideGuides) {
+ this._showGuides(boxType);
+ } else if (options.hideGuides) {
+ this._hideGuides();
+ }
+ }
+
+ // Un-zoom the root wrapper if the page was zoomed.
+ let rootId = this.ID_CLASS_PREFIX + "root";
+ this.markup.scaleRootElement(this.currentNode, rootId);
+
+ return true;
+ },
+
+ _getBoxPathCoordinates: function (boxQuad, nextBoxQuad) {
+ let {p1, p2, p3, p4} = boxQuad;
+
+ let path;
+ if (!nextBoxQuad || !this.options.onlyRegionArea) {
+ // If this is the content box (inner-most box) or if we're not being asked
+ // to highlight only region areas, then draw a simple rectangle.
+ path = "M" + p1.x + "," + p1.y + " " +
+ "L" + p2.x + "," + p2.y + " " +
+ "L" + p3.x + "," + p3.y + " " +
+ "L" + p4.x + "," + p4.y;
+ } else {
+ // Otherwise, just draw the region itself, not a filled rectangle.
+ let {p1: np1, p2: np2, p3: np3, p4: np4} = nextBoxQuad;
+ path = "M" + p1.x + "," + p1.y + " " +
+ "L" + p2.x + "," + p2.y + " " +
+ "L" + p3.x + "," + p3.y + " " +
+ "L" + p4.x + "," + p4.y + " " +
+ "L" + p1.x + "," + p1.y + " " +
+ "L" + np1.x + "," + np1.y + " " +
+ "L" + np4.x + "," + np4.y + " " +
+ "L" + np3.x + "," + np3.y + " " +
+ "L" + np2.x + "," + np2.y + " " +
+ "L" + np1.x + "," + np1.y;
+ }
+
+ return path;
+ },
+
+ /**
+ * Can the current node be highlighted? Does it have quads.
+ * @return {Boolean}
+ */
+ _nodeNeedsHighlighting: function () {
+ return this.currentQuads.margin.length ||
+ this.currentQuads.border.length ||
+ this.currentQuads.padding.length ||
+ this.currentQuads.content.length;
+ },
+
+ _getOuterBounds: function () {
+ for (let region of ["margin", "border", "padding", "content"]) {
+ let quad = this._getOuterQuad(region);
+
+ if (!quad) {
+ // Invisible element such as a script tag.
+ break;
+ }
+
+ let {bottom, height, left, right, top, width, x, y} = quad.bounds;
+
+ if (width > 0 || height > 0) {
+ return {bottom, height, left, right, top, width, x, y};
+ }
+ }
+
+ return {
+ bottom: 0,
+ height: 0,
+ left: 0,
+ right: 0,
+ top: 0,
+ width: 0,
+ x: 0,
+ y: 0
+ };
+ },
+
+ /**
+ * We only want to show guides for horizontal and vertical edges as this helps
+ * to line them up. This method finds these edges and displays a guide there.
+ * @param {String} region The region around which the guides should be shown.
+ */
+ _showGuides: function (region) {
+ let {p1, p2, p3, p4} = this._getOuterQuad(region);
+
+ let allX = [p1.x, p2.x, p3.x, p4.x].sort((a, b) => a - b);
+ let allY = [p1.y, p2.y, p3.y, p4.y].sort((a, b) => a - b);
+ let toShowX = [];
+ let toShowY = [];
+
+ for (let arr of [allX, allY]) {
+ for (let i = 0; i < arr.length; i++) {
+ let val = arr[i];
+
+ if (i !== arr.lastIndexOf(val)) {
+ if (arr === allX) {
+ toShowX.push(val);
+ } else {
+ toShowY.push(val);
+ }
+ arr.splice(arr.lastIndexOf(val), 1);
+ }
+ }
+ }
+
+ // Move guide into place or hide it if no valid co-ordinate was found.
+ this._updateGuide("top", toShowY[0]);
+ this._updateGuide("right", toShowX[1]);
+ this._updateGuide("bottom", toShowY[1]);
+ this._updateGuide("left", toShowX[0]);
+ },
+
+ _hideGuides: function () {
+ for (let side of BOX_MODEL_SIDES) {
+ this.getElement("guide-" + side).setAttribute("hidden", "true");
+ }
+ },
+
+ /**
+ * Move a guide to the appropriate position and display it. If no point is
+ * passed then the guide is hidden.
+ *
+ * @param {String} side
+ * The guide to update
+ * @param {Integer} point
+ * x or y co-ordinate. If this is undefined we hide the guide.
+ */
+ _updateGuide: function (side, point = -1) {
+ let guide = this.getElement("guide-" + side);
+
+ if (point <= 0) {
+ guide.setAttribute("hidden", "true");
+ return false;
+ }
+
+ if (side === "top" || side === "bottom") {
+ guide.setAttribute("x1", "0");
+ guide.setAttribute("y1", point + "");
+ guide.setAttribute("x2", "100%");
+ guide.setAttribute("y2", point + "");
+ } else {
+ guide.setAttribute("x1", point + "");
+ guide.setAttribute("y1", "0");
+ guide.setAttribute("x2", point + "");
+ guide.setAttribute("y2", "100%");
+ }
+
+ guide.removeAttribute("hidden");
+
+ return true;
+ },
+
+ /**
+ * Update node information (displayName#id.class)
+ */
+ _updateInfobar: function () {
+ if (!this.currentNode) {
+ return;
+ }
+
+ let {bindingElement: node, pseudo} =
+ getBindingElementAndPseudo(this.currentNode);
+
+ // Update the tag, id, classes, pseudo-classes and dimensions
+ let displayName = inspector.getNodeDisplayName(node);
+
+ let id = node.id ? "#" + node.id : "";
+
+ let classList = (node.classList || []).length
+ ? "." + [...node.classList].join(".")
+ : "";
+
+ let pseudos = this._getPseudoClasses(node).join("");
+ if (pseudo) {
+ // Display :after as ::after
+ pseudos += ":" + pseudo;
+ }
+
+ let rect = this._getOuterQuad("border").bounds;
+ let dim = parseFloat(rect.width.toPrecision(6)) +
+ " \u00D7 " +
+ parseFloat(rect.height.toPrecision(6));
+
+ this.getElement("infobar-tagname").setTextContent(displayName);
+ this.getElement("infobar-id").setTextContent(id);
+ this.getElement("infobar-classes").setTextContent(classList);
+ this.getElement("infobar-pseudo-classes").setTextContent(pseudos);
+ this.getElement("infobar-dimensions").setTextContent(dim);
+
+ this._moveInfobar();
+ },
+
+ _getPseudoClasses: function (node) {
+ if (node.nodeType !== nodeConstants.ELEMENT_NODE) {
+ // hasPseudoClassLock can only be used on Elements.
+ return [];
+ }
+
+ return PSEUDO_CLASSES.filter(pseudo => hasPseudoClassLock(node, pseudo));
+ },
+
+ /**
+ * Move the Infobar to the right place in the highlighter.
+ */
+ _moveInfobar: function () {
+ let bounds = this._getOuterBounds();
+ let container = this.getElement("infobar-container");
+
+ moveInfobar(container, bounds, this.win);
+ },
+
+ onWillNavigate: function ({ isTopLevel }) {
+ if (isTopLevel) {
+ this.hide();
+ }
+ }
+});
+exports.BoxModelHighlighter = BoxModelHighlighter;