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+/**
+ * Copyright (c) 2013 Lea Verou. All rights reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+// Based on www.cubic-bezier.com by Lea Verou
+// See https://github.com/LeaVerou/cubic-bezier
+
+"use strict";
+
+const EventEmitter = require("resource://devtools/shared/event-emitter.js");
+const {
+ PREDEFINED,
+ PRESETS,
+ DEFAULT_PRESET_CATEGORY,
+} = require("resource://devtools/client/shared/widgets/CubicBezierPresets.js");
+const { getCSSLexer } = require("resource://devtools/shared/css/lexer.js");
+const XHTML_NS = "http://www.w3.org/1999/xhtml";
+
+/**
+ * CubicBezier data structure helper
+ * Accepts an array of coordinates and exposes a few useful getters
+ * @param {Array} coordinates i.e. [.42, 0, .58, 1]
+ */
+function CubicBezier(coordinates) {
+ if (!coordinates) {
+ throw new Error("No offsets were defined");
+ }
+
+ this.coordinates = coordinates.map(n => +n);
+
+ for (let i = 4; i--; ) {
+ const xy = this.coordinates[i];
+ if (isNaN(xy) || (!(i % 2) && (xy < 0 || xy > 1))) {
+ throw new Error(`Wrong coordinate at ${i}(${xy})`);
+ }
+ }
+
+ this.coordinates.toString = function () {
+ return (
+ this.map(n => {
+ return (Math.round(n * 100) / 100 + "").replace(/^0\./, ".");
+ }) + ""
+ );
+ };
+}
+
+exports.CubicBezier = CubicBezier;
+
+CubicBezier.prototype = {
+ get P1() {
+ return this.coordinates.slice(0, 2);
+ },
+
+ get P2() {
+ return this.coordinates.slice(2);
+ },
+
+ toString() {
+ // Check first if current coords are one of css predefined functions
+ const predefName = Object.keys(PREDEFINED).find(key =>
+ coordsAreEqual(PREDEFINED[key], this.coordinates)
+ );
+
+ return predefName || "cubic-bezier(" + this.coordinates + ")";
+ },
+};
+
+/**
+ * Bezier curve canvas plotting class
+ * @param {DOMNode} canvas
+ * @param {CubicBezier} bezier
+ * @param {Array} padding Amount of horizontal,vertical padding around the graph
+ */
+function BezierCanvas(canvas, bezier, padding) {
+ this.canvas = canvas;
+ this.bezier = bezier;
+ this.padding = getPadding(padding);
+
+ // Convert to a cartesian coordinate system with axes from 0 to 1
+ this.ctx = this.canvas.getContext("2d");
+ const p = this.padding;
+
+ this.ctx.scale(
+ canvas.width * (1 - p[1] - p[3]),
+ -canvas.height * (1 - p[0] - p[2])
+ );
+ this.ctx.translate(p[3] / (1 - p[1] - p[3]), -1 - p[0] / (1 - p[0] - p[2]));
+}
+
+exports.BezierCanvas = BezierCanvas;
+
+BezierCanvas.prototype = {
+ /**
+ * Get P1 and P2 current top/left offsets so they can be positioned
+ * @return {Array} Returns an array of 2 {top:String,left:String} objects
+ */
+ get offsets() {
+ const p = this.padding,
+ w = this.canvas.width,
+ h = this.canvas.height;
+
+ return [
+ {
+ left:
+ w * (this.bezier.coordinates[0] * (1 - p[3] - p[1]) - p[3]) + "px",
+ top:
+ h * (1 - this.bezier.coordinates[1] * (1 - p[0] - p[2]) - p[0]) +
+ "px",
+ },
+ {
+ left:
+ w * (this.bezier.coordinates[2] * (1 - p[3] - p[1]) - p[3]) + "px",
+ top:
+ h * (1 - this.bezier.coordinates[3] * (1 - p[0] - p[2]) - p[0]) +
+ "px",
+ },
+ ];
+ },
+
+ /**
+ * Convert an element's left/top offsets into coordinates
+ */
+ offsetsToCoordinates(element) {
+ const w = this.canvas.width,
+ h = this.canvas.height;
+
+ // Convert padding percentage to actual padding
+ const p = this.padding.map((a, i) => a * (i % 2 ? w : h));
+
+ return [
+ (parseFloat(element.style.left) - p[3]) / (w + p[1] + p[3]),
+ (h - parseFloat(element.style.top) - p[2]) / (h - p[0] - p[2]),
+ ];
+ },
+
+ /**
+ * Draw the cubic bezier curve for the current coordinates
+ */
+ plot(settings = {}) {
+ const xy = this.bezier.coordinates;
+
+ const defaultSettings = {
+ handleColor: "#666",
+ handleThickness: 0.008,
+ bezierColor: "#4C9ED9",
+ bezierThickness: 0.015,
+ drawHandles: true,
+ };
+
+ for (const setting in settings) {
+ defaultSettings[setting] = settings[setting];
+ }
+
+ // Clear the canvas –making sure to clear the
+ // whole area by resetting the transform first.
+ this.ctx.save();
+ this.ctx.setTransform(1, 0, 0, 1, 0, 0);
+ this.ctx.clearRect(0, 0, this.canvas.width, this.canvas.height);
+ this.ctx.restore();
+
+ if (defaultSettings.drawHandles) {
+ // Draw control handles
+ this.ctx.beginPath();
+ this.ctx.fillStyle = defaultSettings.handleColor;
+ this.ctx.lineWidth = defaultSettings.handleThickness;
+ this.ctx.strokeStyle = defaultSettings.handleColor;
+
+ this.ctx.moveTo(0, 0);
+ this.ctx.lineTo(xy[0], xy[1]);
+ this.ctx.moveTo(1, 1);
+ this.ctx.lineTo(xy[2], xy[3]);
+
+ this.ctx.stroke();
+ this.ctx.closePath();
+
+ const circle = (ctx, cx, cy, r) => {
+ ctx.beginPath();
+ ctx.arc(cx, cy, r, 0, 2 * Math.PI, !1);
+ ctx.closePath();
+ };
+
+ circle(this.ctx, xy[0], xy[1], 1.5 * defaultSettings.handleThickness);
+ this.ctx.fill();
+ circle(this.ctx, xy[2], xy[3], 1.5 * defaultSettings.handleThickness);
+ this.ctx.fill();
+ }
+
+ // Draw bezier curve
+ this.ctx.beginPath();
+ this.ctx.lineWidth = defaultSettings.bezierThickness;
+ this.ctx.strokeStyle = defaultSettings.bezierColor;
+ this.ctx.moveTo(0, 0);
+ this.ctx.bezierCurveTo(xy[0], xy[1], xy[2], xy[3], 1, 1);
+ this.ctx.stroke();
+ this.ctx.closePath();
+ },
+};
+
+/**
+ * Cubic-bezier widget. Uses the BezierCanvas class to draw the curve and
+ * adds the control points and user interaction
+ * @param {DOMNode} parent The container where the graph should be created
+ * @param {Array} coordinates Coordinates of the curve to be drawn
+ *
+ * Emits "updated" events whenever the curve is changed. Along with the event is
+ * sent a CubicBezier object
+ */
+function CubicBezierWidget(
+ parent,
+ coordinates = PRESETS["ease-in"]["ease-in-sine"]
+) {
+ EventEmitter.decorate(this);
+
+ this.parent = parent;
+ const { curve, p1, p2 } = this._initMarkup();
+
+ this.curveBoundingBox = curve.getBoundingClientRect();
+ this.curve = curve;
+ this.p1 = p1;
+ this.p2 = p2;
+
+ // Create and plot the bezier curve
+ this.bezierCanvas = new BezierCanvas(
+ this.curve,
+ new CubicBezier(coordinates),
+ [0.3, 0]
+ );
+ this.bezierCanvas.plot();
+
+ // Place the control points
+ const offsets = this.bezierCanvas.offsets;
+ this.p1.style.left = offsets[0].left;
+ this.p1.style.top = offsets[0].top;
+ this.p2.style.left = offsets[1].left;
+ this.p2.style.top = offsets[1].top;
+
+ this._onPointMouseDown = this._onPointMouseDown.bind(this);
+ this._onPointKeyDown = this._onPointKeyDown.bind(this);
+ this._onCurveClick = this._onCurveClick.bind(this);
+ this._onNewCoordinates = this._onNewCoordinates.bind(this);
+ this.onPrefersReducedMotionChange =
+ this.onPrefersReducedMotionChange.bind(this);
+
+ // Add preset preview menu
+ this.presets = new CubicBezierPresetWidget(parent);
+
+ // Add the timing function previewer
+ // if prefers-reduced-motion is not set
+ this.reducedMotion = parent.ownerGlobal.matchMedia(
+ "(prefers-reduced-motion)"
+ );
+ if (!this.reducedMotion.matches) {
+ this.timingPreview = new TimingFunctionPreviewWidget(parent);
+ }
+
+ // add event listener to change prefers-reduced-motion
+ // of the timing function preview during runtime
+ this.reducedMotion.addEventListener(
+ "change",
+ this.onPrefersReducedMotionChange
+ );
+
+ this._initEvents();
+}
+
+exports.CubicBezierWidget = CubicBezierWidget;
+
+CubicBezierWidget.prototype = {
+ _initMarkup() {
+ const doc = this.parent.ownerDocument;
+
+ const wrap = doc.createElementNS(XHTML_NS, "div");
+ wrap.className = "display-wrap";
+
+ const plane = doc.createElementNS(XHTML_NS, "div");
+ plane.className = "coordinate-plane";
+
+ const p1 = doc.createElementNS(XHTML_NS, "button");
+ p1.className = "control-point";
+ plane.appendChild(p1);
+
+ const p2 = doc.createElementNS(XHTML_NS, "button");
+ p2.className = "control-point";
+ plane.appendChild(p2);
+
+ const curve = doc.createElementNS(XHTML_NS, "canvas");
+ curve.setAttribute("width", 150);
+ curve.setAttribute("height", 370);
+ curve.className = "curve";
+
+ plane.appendChild(curve);
+ wrap.appendChild(plane);
+
+ this.parent.appendChild(wrap);
+
+ return {
+ p1,
+ p2,
+ curve,
+ };
+ },
+
+ onPrefersReducedMotionChange(event) {
+ // if prefers-reduced-motion is enabled destroy timing function preview
+ // else create it if it does not exist
+ if (event.matches) {
+ if (this.timingPreview) {
+ this.timingPreview.destroy();
+ }
+ this.timingPreview = undefined;
+ } else if (!this.timingPreview) {
+ this.timingPreview = new TimingFunctionPreviewWidget(this.parent);
+ }
+ },
+
+ _removeMarkup() {
+ this.parent.querySelector(".display-wrap").remove();
+ },
+
+ _initEvents() {
+ this.p1.addEventListener("mousedown", this._onPointMouseDown);
+ this.p2.addEventListener("mousedown", this._onPointMouseDown);
+
+ this.p1.addEventListener("keydown", this._onPointKeyDown);
+ this.p2.addEventListener("keydown", this._onPointKeyDown);
+
+ this.curve.addEventListener("click", this._onCurveClick);
+
+ this.presets.on("new-coordinates", this._onNewCoordinates);
+ },
+
+ _removeEvents() {
+ this.p1.removeEventListener("mousedown", this._onPointMouseDown);
+ this.p2.removeEventListener("mousedown", this._onPointMouseDown);
+
+ this.p1.removeEventListener("keydown", this._onPointKeyDown);
+ this.p2.removeEventListener("keydown", this._onPointKeyDown);
+
+ this.curve.removeEventListener("click", this._onCurveClick);
+
+ this.presets.off("new-coordinates", this._onNewCoordinates);
+ },
+
+ _onPointMouseDown(event) {
+ // Updating the boundingbox in case it has changed
+ this.curveBoundingBox = this.curve.getBoundingClientRect();
+
+ const point = event.target;
+ const doc = point.ownerDocument;
+ const self = this;
+
+ doc.onmousemove = function drag(e) {
+ let x = e.pageX;
+ const y = e.pageY;
+ const left = self.curveBoundingBox.left;
+ const top = self.curveBoundingBox.top;
+
+ if (x === 0 && y == 0) {
+ return;
+ }
+
+ // Constrain x
+ x = Math.min(Math.max(left, x), left + self.curveBoundingBox.width);
+
+ point.style.left = x - left + "px";
+ point.style.top = y - top + "px";
+
+ self._updateFromPoints();
+ };
+
+ doc.onmouseup = function () {
+ point.focus();
+ doc.onmousemove = doc.onmouseup = null;
+ };
+ },
+
+ _onPointKeyDown(event) {
+ const point = event.target;
+ const code = event.keyCode;
+
+ if (code >= 37 && code <= 40) {
+ event.preventDefault();
+
+ // Arrow keys pressed
+ const left = parseInt(point.style.left, 10);
+ const top = parseInt(point.style.top, 10);
+ const offset = 3 * (event.shiftKey ? 10 : 1);
+
+ switch (code) {
+ case 37:
+ point.style.left = left - offset + "px";
+ break;
+ case 38:
+ point.style.top = top - offset + "px";
+ break;
+ case 39:
+ point.style.left = left + offset + "px";
+ break;
+ case 40:
+ point.style.top = top + offset + "px";
+ break;
+ }
+
+ this._updateFromPoints();
+ }
+ },
+
+ _onCurveClick(event) {
+ this.curveBoundingBox = this.curve.getBoundingClientRect();
+
+ const left = this.curveBoundingBox.left;
+ const top = this.curveBoundingBox.top;
+ const x = event.pageX - left;
+ const y = event.pageY - top;
+
+ // Find which point is closer
+ const distP1 = distance(
+ x,
+ y,
+ parseInt(this.p1.style.left, 10),
+ parseInt(this.p1.style.top, 10)
+ );
+ const distP2 = distance(
+ x,
+ y,
+ parseInt(this.p2.style.left, 10),
+ parseInt(this.p2.style.top, 10)
+ );
+
+ const point = distP1 < distP2 ? this.p1 : this.p2;
+ point.style.left = x + "px";
+ point.style.top = y + "px";
+
+ this._updateFromPoints();
+ },
+
+ _onNewCoordinates(coordinates) {
+ this.coordinates = coordinates;
+ },
+
+ /**
+ * Get the current point coordinates and redraw the curve to match
+ */
+ _updateFromPoints() {
+ // Get the new coordinates from the point's offsets
+ let coordinates = this.bezierCanvas.offsetsToCoordinates(this.p1);
+ coordinates = coordinates.concat(
+ this.bezierCanvas.offsetsToCoordinates(this.p2)
+ );
+
+ this.presets.refreshMenu(coordinates);
+ this._redraw(coordinates);
+ },
+
+ /**
+ * Redraw the curve
+ * @param {Array} coordinates The array of control point coordinates
+ */
+ _redraw(coordinates) {
+ // Provide a new CubicBezier to the canvas and plot the curve
+ this.bezierCanvas.bezier = new CubicBezier(coordinates);
+ this.bezierCanvas.plot();
+ this.emit("updated", this.bezierCanvas.bezier);
+
+ if (this.timingPreview) {
+ this.timingPreview.preview(this.bezierCanvas.bezier.toString());
+ }
+ },
+
+ /**
+ * Set new coordinates for the control points and redraw the curve
+ * @param {Array} coordinates
+ */
+ set coordinates(coordinates) {
+ this._redraw(coordinates);
+
+ // Move the points
+ const offsets = this.bezierCanvas.offsets;
+ this.p1.style.left = offsets[0].left;
+ this.p1.style.top = offsets[0].top;
+ this.p2.style.left = offsets[1].left;
+ this.p2.style.top = offsets[1].top;
+ },
+
+ /**
+ * Set new coordinates for the control point and redraw the curve
+ * @param {String} value A string value. E.g. "linear",
+ * "cubic-bezier(0,0,1,1)"
+ */
+ set cssCubicBezierValue(value) {
+ if (!value) {
+ return;
+ }
+
+ value = value.trim();
+
+ // Try with one of the predefined values
+ const coordinates = parseTimingFunction(value);
+
+ this.presets.refreshMenu(coordinates);
+ this.coordinates = coordinates;
+ },
+
+ destroy() {
+ this._removeEvents();
+ this._removeMarkup();
+
+ // remove prefers-reduced-motion event listener
+ this.reducedMotion.removeEventListener(
+ "change",
+ this.onPrefersReducedMotionChange
+ );
+ this.reducedMotion = null;
+
+ if (this.timingPreview) {
+ this.timingPreview.destroy();
+ this.timingPreview = null;
+ }
+ this.presets.destroy();
+
+ this.curve = this.p1 = this.p2 = null;
+ },
+};
+
+/**
+ * CubicBezierPreset widget.
+ * Builds a menu of presets from CubicBezierPresets
+ * @param {DOMNode} parent The container where the preset panel should be
+ * created
+ *
+ * Emits "new-coordinate" event along with the coordinates
+ * whenever a preset is selected.
+ */
+function CubicBezierPresetWidget(parent) {
+ this.parent = parent;
+
+ const { presetPane, presets, categories } = this._initMarkup();
+ this.presetPane = presetPane;
+ this.presets = presets;
+ this.categories = categories;
+
+ this._activeCategory = null;
+ this._activePresetList = null;
+ this._activePreset = null;
+
+ this._onCategoryClick = this._onCategoryClick.bind(this);
+ this._onPresetClick = this._onPresetClick.bind(this);
+
+ EventEmitter.decorate(this);
+ this._initEvents();
+}
+
+exports.CubicBezierPresetWidget = CubicBezierPresetWidget;
+
+CubicBezierPresetWidget.prototype = {
+ /*
+ * Constructs a list of all preset categories and a list
+ * of presets for each category.
+ *
+ * High level markup:
+ * div .preset-pane
+ * div .preset-categories
+ * div .category
+ * div .category
+ * ...
+ * div .preset-container
+ * div .presetList
+ * div .preset
+ * ...
+ * div .presetList
+ * div .preset
+ * ...
+ */
+ _initMarkup() {
+ const doc = this.parent.ownerDocument;
+
+ const presetPane = doc.createElementNS(XHTML_NS, "div");
+ presetPane.className = "preset-pane";
+
+ const categoryList = doc.createElementNS(XHTML_NS, "div");
+ categoryList.id = "preset-categories";
+
+ const presetContainer = doc.createElementNS(XHTML_NS, "div");
+ presetContainer.id = "preset-container";
+
+ Object.keys(PRESETS).forEach(categoryLabel => {
+ const category = this._createCategory(categoryLabel);
+ categoryList.appendChild(category);
+
+ const presetList = this._createPresetList(categoryLabel);
+ presetContainer.appendChild(presetList);
+ });
+
+ presetPane.appendChild(categoryList);
+ presetPane.appendChild(presetContainer);
+
+ this.parent.appendChild(presetPane);
+
+ const allCategories = presetPane.querySelectorAll(".category");
+ const allPresets = presetPane.querySelectorAll(".preset");
+
+ return {
+ presetPane,
+ presets: allPresets,
+ categories: allCategories,
+ };
+ },
+
+ _createCategory(categoryLabel) {
+ const doc = this.parent.ownerDocument;
+
+ const category = doc.createElementNS(XHTML_NS, "div");
+ category.id = categoryLabel;
+ category.classList.add("category");
+
+ const categoryDisplayLabel = this._normalizeCategoryLabel(categoryLabel);
+ category.textContent = categoryDisplayLabel;
+ category.setAttribute("title", categoryDisplayLabel);
+
+ return category;
+ },
+
+ _normalizeCategoryLabel(categoryLabel) {
+ return categoryLabel.replace("/-/g", " ");
+ },
+
+ _createPresetList(categoryLabel) {
+ const doc = this.parent.ownerDocument;
+
+ const presetList = doc.createElementNS(XHTML_NS, "div");
+ presetList.id = "preset-category-" + categoryLabel;
+ presetList.classList.add("preset-list");
+
+ Object.keys(PRESETS[categoryLabel]).forEach(presetLabel => {
+ const preset = this._createPreset(categoryLabel, presetLabel);
+ presetList.appendChild(preset);
+ });
+
+ return presetList;
+ },
+
+ _createPreset(categoryLabel, presetLabel) {
+ const doc = this.parent.ownerDocument;
+
+ const preset = doc.createElementNS(XHTML_NS, "div");
+ preset.classList.add("preset");
+ preset.id = presetLabel;
+ preset.coordinates = PRESETS[categoryLabel][presetLabel];
+ // Create preset preview
+ const curve = doc.createElementNS(XHTML_NS, "canvas");
+ const bezier = new CubicBezier(preset.coordinates);
+ curve.setAttribute("height", 50);
+ curve.setAttribute("width", 50);
+ preset.bezierCanvas = new BezierCanvas(curve, bezier, [0.15, 0]);
+ preset.bezierCanvas.plot({
+ drawHandles: false,
+ bezierThickness: 0.025,
+ });
+ preset.appendChild(curve);
+
+ // Create preset label
+ const presetLabelElem = doc.createElementNS(XHTML_NS, "p");
+ const presetDisplayLabel = this._normalizePresetLabel(
+ categoryLabel,
+ presetLabel
+ );
+ presetLabelElem.textContent = presetDisplayLabel;
+ preset.appendChild(presetLabelElem);
+ preset.setAttribute("title", presetDisplayLabel);
+
+ return preset;
+ },
+
+ _normalizePresetLabel(categoryLabel, presetLabel) {
+ return presetLabel.replace(categoryLabel + "-", "").replace("/-/g", " ");
+ },
+
+ _initEvents() {
+ for (const category of this.categories) {
+ category.addEventListener("click", this._onCategoryClick);
+ }
+
+ for (const preset of this.presets) {
+ preset.addEventListener("click", this._onPresetClick);
+ }
+ },
+
+ _removeEvents() {
+ for (const category of this.categories) {
+ category.removeEventListener("click", this._onCategoryClick);
+ }
+
+ for (const preset of this.presets) {
+ preset.removeEventListener("click", this._onPresetClick);
+ }
+ },
+
+ _onPresetClick(event) {
+ this.emit("new-coordinates", event.currentTarget.coordinates);
+ this.activePreset = event.currentTarget;
+ },
+
+ _onCategoryClick(event) {
+ this.activeCategory = event.target;
+ },
+
+ _setActivePresetList(presetListId) {
+ const presetList = this.presetPane.querySelector("#" + presetListId);
+ swapClassName("active-preset-list", this._activePresetList, presetList);
+ this._activePresetList = presetList;
+ },
+
+ set activeCategory(category) {
+ swapClassName("active-category", this._activeCategory, category);
+ this._activeCategory = category;
+ this._setActivePresetList("preset-category-" + category.id);
+ },
+
+ get activeCategory() {
+ return this._activeCategory;
+ },
+
+ set activePreset(preset) {
+ swapClassName("active-preset", this._activePreset, preset);
+ this._activePreset = preset;
+ },
+
+ get activePreset() {
+ return this._activePreset;
+ },
+
+ /**
+ * Called by CubicBezierWidget onload and when
+ * the curve is modified via the canvas.
+ * Attempts to match the new user setting with an
+ * existing preset.
+ * @param {Array} coordinates new coords [i, j, k, l]
+ */
+ refreshMenu(coordinates) {
+ // If we cannot find a matching preset, keep
+ // menu on last known preset category.
+ let category = this._activeCategory;
+
+ // If we cannot find a matching preset
+ // deselect any selected preset.
+ let preset = null;
+
+ // If a category has never been viewed before
+ // show the default category.
+ if (!category) {
+ category = this.parent.querySelector("#" + DEFAULT_PRESET_CATEGORY);
+ }
+
+ // If the new coordinates do match a preset,
+ // set its category and preset button as active.
+ Object.keys(PRESETS).forEach(categoryLabel => {
+ Object.keys(PRESETS[categoryLabel]).forEach(presetLabel => {
+ if (coordsAreEqual(PRESETS[categoryLabel][presetLabel], coordinates)) {
+ category = this.parent.querySelector("#" + categoryLabel);
+ preset = this.parent.querySelector("#" + presetLabel);
+ }
+ });
+ });
+
+ this.activeCategory = category;
+ this.activePreset = preset;
+ },
+
+ destroy() {
+ this._removeEvents();
+ this.parent.querySelector(".preset-pane").remove();
+ },
+};
+
+/**
+ * The TimingFunctionPreviewWidget animates a dot on a scale with a given
+ * timing-function
+ * @param {DOMNode} parent The container where this widget should go
+ */
+function TimingFunctionPreviewWidget(parent) {
+ this.previousValue = null;
+
+ this.parent = parent;
+ this._initMarkup();
+}
+
+TimingFunctionPreviewWidget.prototype = {
+ PREVIEW_DURATION: 1000,
+
+ _initMarkup() {
+ const doc = this.parent.ownerDocument;
+
+ const container = doc.createElementNS(XHTML_NS, "div");
+ container.className = "timing-function-preview";
+
+ this.dot = doc.createElementNS(XHTML_NS, "div");
+ this.dot.className = "dot";
+ container.appendChild(this.dot);
+
+ const scale = doc.createElementNS(XHTML_NS, "div");
+ scale.className = "scale";
+ container.appendChild(scale);
+
+ this.parent.appendChild(container);
+ },
+
+ destroy() {
+ this.dot.getAnimations().forEach(anim => anim.cancel());
+ this.parent.querySelector(".timing-function-preview").remove();
+ this.parent = this.dot = null;
+ },
+
+ /**
+ * Preview a new timing function. The current preview will only be stopped if
+ * the supplied function value is different from the previous one. If the
+ * supplied function is invalid, the preview will stop.
+ * @param {String} value
+ */
+ preview(value) {
+ // Don't restart the preview animation if the value is the same
+ if (value === this.previousValue) {
+ return;
+ }
+
+ if (parseTimingFunction(value)) {
+ this.restartAnimation(value);
+ }
+
+ this.previousValue = value;
+ },
+
+ /**
+ * Re-start the preview animation from the beginning.
+ * @param {String} timingFunction The value for the timing-function.
+ */
+ restartAnimation(timingFunction) {
+ // Cancel the previous animation if there was any.
+ this.dot.getAnimations().forEach(anim => anim.cancel());
+
+ // And start the new one.
+ // The animation consists of a few keyframes that move the dot to the right of the
+ // container, and then move it back to the left.
+ // It also contains some pause where the dot is semi transparent, before it moves to
+ // the right, and once again, before it comes back to the left.
+ // The timing function passed to this function is applied to the keyframes that
+ // actually move the dot. This way it can be previewed in both direction, instead of
+ // being spread over the whole animation.
+ this.dot.animate(
+ [
+ { left: "-7px", opacity: 0.5, offset: 0 },
+ { left: "-7px", opacity: 0.5, offset: 0.19 },
+ { left: "-7px", opacity: 1, offset: 0.2, easing: timingFunction },
+ { left: "143px", opacity: 1, offset: 0.5 },
+ { left: "143px", opacity: 0.5, offset: 0.51 },
+ { left: "143px", opacity: 0.5, offset: 0.7 },
+ { left: "143px", opacity: 1, offset: 0.71, easing: timingFunction },
+ { left: "-7px", opacity: 1, offset: 1 },
+ ],
+ {
+ duration: this.PREVIEW_DURATION * 2,
+ iterations: Infinity,
+ }
+ );
+ },
+};
+
+// Helpers
+
+function getPadding(padding) {
+ const p = typeof padding === "number" ? [padding] : padding;
+
+ if (p.length === 1) {
+ p[1] = p[0];
+ }
+
+ if (p.length === 2) {
+ p[2] = p[0];
+ }
+
+ if (p.length === 3) {
+ p[3] = p[1];
+ }
+
+ return p;
+}
+
+function distance(x1, y1, x2, y2) {
+ return Math.sqrt(Math.pow(x1 - x2, 2) + Math.pow(y1 - y2, 2));
+}
+
+/**
+ * Parse a string to see whether it is a valid timing function.
+ * If it is, return the coordinates as an array.
+ * Otherwise, return undefined.
+ * @param {String} value
+ * @return {Array} of coordinates, or undefined
+ */
+function parseTimingFunction(value) {
+ if (value in PREDEFINED) {
+ return PREDEFINED[value];
+ }
+
+ const tokenStream = getCSSLexer(value);
+ const getNextToken = () => {
+ while (true) {
+ const token = tokenStream.nextToken();
+ if (
+ !token ||
+ (token.tokenType !== "whitespace" && token.tokenType !== "comment")
+ ) {
+ return token;
+ }
+ }
+ };
+
+ let token = getNextToken();
+ if (token.tokenType !== "function" || token.text !== "cubic-bezier") {
+ return undefined;
+ }
+
+ const result = [];
+ for (let i = 0; i < 4; ++i) {
+ token = getNextToken();
+ if (!token || token.tokenType !== "number") {
+ return undefined;
+ }
+ result.push(token.number);
+
+ token = getNextToken();
+ if (
+ !token ||
+ token.tokenType !== "symbol" ||
+ token.text !== (i == 3 ? ")" : ",")
+ ) {
+ return undefined;
+ }
+ }
+
+ return result;
+}
+
+exports.parseTimingFunction = parseTimingFunction;
+
+/**
+ * Removes a class from a node and adds it to another.
+ * @param {String} className the class to swap
+ * @param {DOMNode} from the node to remove the class from
+ * @param {DOMNode} to the node to add the class to
+ */
+function swapClassName(className, from, to) {
+ if (from !== null) {
+ from.classList.remove(className);
+ }
+
+ if (to !== null) {
+ to.classList.add(className);
+ }
+}
+
+/**
+ * Compares two arrays of coordinates [i, j, k, l]
+ * @param {Array} c1 first coordinate array to compare
+ * @param {Array} c2 second coordinate array to compare
+ * @return {Boolean}
+ */
+function coordsAreEqual(c1, c2) {
+ return c1.reduce((prev, curr, index) => prev && curr === c2[index], true);
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-26 21:46:05 +0000