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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, getComputedStyle,
createSVGNode, createNode } = require("./utils/markup");
const { setIgnoreLayoutChanges,
getNodeBounds } = require("devtools/shared/layout/utils");
// The minimum distance a line should be before it has an arrow marker-end
const ARROW_LINE_MIN_DISTANCE = 10;
var MARKER_COUNTER = 1;
/**
* The CssTransformHighlighter is the class that draws an outline around a
* transformed element and an outline around where it would be if untransformed
* as well as arrows connecting the 2 outlines' corners.
*/
function CssTransformHighlighter(highlighterEnv) {
AutoRefreshHighlighter.call(this, highlighterEnv);
this.markup = new CanvasFrameAnonymousContentHelper(this.highlighterEnv,
this._buildMarkup.bind(this));
}
CssTransformHighlighter.prototype = extend(AutoRefreshHighlighter.prototype, {
typeName: "CssTransformHighlighter",
ID_CLASS_PREFIX: "css-transform-",
_buildMarkup: function () {
let container = createNode(this.win, {
attributes: {
"class": "highlighter-container"
}
});
// The root wrapper is used to unzoom the highlighter when needed.
let rootWrapper = createNode(this.win, {
parent: container,
attributes: {
"id": "root",
"class": "root"
},
prefix: this.ID_CLASS_PREFIX
});
let svg = createSVGNode(this.win, {
nodeType: "svg",
parent: rootWrapper,
attributes: {
"id": "elements",
"hidden": "true",
"width": "100%",
"height": "100%"
},
prefix: this.ID_CLASS_PREFIX
});
// Add a marker tag to the svg root for the arrow tip
this.markerId = "arrow-marker-" + MARKER_COUNTER;
MARKER_COUNTER++;
let marker = createSVGNode(this.win, {
nodeType: "marker",
parent: svg,
attributes: {
"id": this.markerId,
"markerWidth": "10",
"markerHeight": "5",
"orient": "auto",
"markerUnits": "strokeWidth",
"refX": "10",
"refY": "5",
"viewBox": "0 0 10 10"
},
prefix: this.ID_CLASS_PREFIX
});
createSVGNode(this.win, {
nodeType: "path",
parent: marker,
attributes: {
"d": "M 0 0 L 10 5 L 0 10 z",
"fill": "#08C"
}
});
let shapesGroup = createSVGNode(this.win, {
nodeType: "g",
parent: svg
});
// Create the 2 polygons (transformed and untransformed)
createSVGNode(this.win, {
nodeType: "polygon",
parent: shapesGroup,
attributes: {
"id": "untransformed",
"class": "untransformed"
},
prefix: this.ID_CLASS_PREFIX
});
createSVGNode(this.win, {
nodeType: "polygon",
parent: shapesGroup,
attributes: {
"id": "transformed",
"class": "transformed"
},
prefix: this.ID_CLASS_PREFIX
});
// Create the arrows
for (let nb of ["1", "2", "3", "4"]) {
createSVGNode(this.win, {
nodeType: "line",
parent: shapesGroup,
attributes: {
"id": "line" + nb,
"class": "line",
"marker-end": "url(#" + this.markerId + ")"
},
prefix: this.ID_CLASS_PREFIX
});
}
return container;
},
/**
* Destroy the nodes. Remove listeners.
*/
destroy: function () {
AutoRefreshHighlighter.prototype.destroy.call(this);
this.markup.destroy();
},
getElement: function (id) {
return this.markup.getElement(this.ID_CLASS_PREFIX + id);
},
/**
* Show the highlighter on a given node
*/
_show: function () {
if (!this._isTransformed(this.currentNode)) {
this.hide();
return false;
}
return this._update();
},
/**
* Checks if the supplied node is transformed and not inline
*/
_isTransformed: function (node) {
let style = getComputedStyle(node);
return style && (style.transform !== "none" && style.display !== "inline");
},
_setPolygonPoints: function (quad, id) {
let points = [];
for (let point of ["p1", "p2", "p3", "p4"]) {
points.push(quad[point].x + "," + quad[point].y);
}
this.getElement(id).setAttribute("points", points.join(" "));
},
_setLinePoints: function (p1, p2, id) {
let line = this.getElement(id);
line.setAttribute("x1", p1.x);
line.setAttribute("y1", p1.y);
line.setAttribute("x2", p2.x);
line.setAttribute("y2", p2.y);
let dist = Math.sqrt(Math.pow(p2.x - p1.x, 2) + Math.pow(p2.y - p1.y, 2));
if (dist < ARROW_LINE_MIN_DISTANCE) {
line.removeAttribute("marker-end");
} else {
line.setAttribute("marker-end", "url(#" + this.markerId + ")");
}
},
/**
* 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 () {
setIgnoreLayoutChanges(true);
// Getting the points for the transformed shape
let quads = this.currentQuads.border;
if (!quads.length ||
quads[0].bounds.width <= 0 || quads[0].bounds.height <= 0) {
this._hideShapes();
return false;
}
let [quad] = quads;
// Getting the points for the untransformed shape
let untransformedQuad = getNodeBounds(this.win, this.currentNode);
this._setPolygonPoints(quad, "transformed");
this._setPolygonPoints(untransformedQuad, "untransformed");
for (let nb of ["1", "2", "3", "4"]) {
this._setLinePoints(untransformedQuad["p" + nb], quad["p" + nb], "line" + nb);
}
// Adapt to the current zoom
this.markup.scaleRootElement(this.currentNode, this.ID_CLASS_PREFIX + "root");
this._showShapes();
setIgnoreLayoutChanges(false, this.highlighterEnv.window.document.documentElement);
return true;
},
/**
* Hide the highlighter, the outline and the infobar.
*/
_hide: function () {
setIgnoreLayoutChanges(true);
this._hideShapes();
setIgnoreLayoutChanges(false, this.highlighterEnv.window.document.documentElement);
},
_hideShapes: function () {
this.getElement("elements").setAttribute("hidden", "true");
},
_showShapes: function () {
this.getElement("elements").removeAttribute("hidden");
}
});
exports.CssTransformHighlighter = CssTransformHighlighter;
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