Andrew Zambazos
305 lines
10 KiB
JavaScript
305 lines
10 KiB
JavaScript
/*
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* Copyright (C) 2019 Apple Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
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* THE POSSIBILITY OF SUCH DAMAGE.
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*/
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WI.ColorSquare = class ColorSquare
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{
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constructor(delegate, dimension)
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{
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this._delegate = delegate;
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this._hue = 0;
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this._x = 0;
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this._y = 0;
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this._gamut = null;
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this._crosshairPosition = null;
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this._element = document.createElement("div");
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this._element.className = "color-square";
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this._element.tabIndex = 0;
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let saturationGradientElement = this._element.appendChild(document.createElement("div"));
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saturationGradientElement.className = "saturation-gradient fill";
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let lightnessGradientElement = this._element.appendChild(document.createElement("div"));
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lightnessGradientElement.className = "lightness-gradient fill";
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this._srgbLabelElement = null;
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this._svgElement = null;
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this._polylineElement = null;
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this._element.addEventListener("mousedown", this);
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this._element.addEventListener("keydown", this._handleKeyDown.bind(this));
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this._crosshairElement = this._element.appendChild(document.createElement("div"));
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this._crosshairElement.className = "crosshair";
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this.dimension = dimension;
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}
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// Public
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get element() { return this._element; }
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set dimension(dimension)
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{
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console.assert(!isNaN(dimension));
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if (dimension === this._dimension)
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return;
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this._dimension = dimension;
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this._element.style.width = this.element.style.height = `${this._dimension}px`;
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this._updateBaseColor();
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}
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get hue()
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{
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return this._hue;
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}
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set hue(hue)
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{
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this._hue = hue;
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this._updateBaseColor();
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}
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get tintedColor()
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{
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if (this._crosshairPosition) {
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if (this._gamut === WI.Color.Gamut.DisplayP3) {
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let rgb = WI.Color.hsv2rgb(this._hue, this._saturation, this._brightness);
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rgb = rgb.map(((x) => Math.roundTo(x, 0.001)));
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return new WI.Color(WI.Color.Format.ColorFunction, rgb, this._gamut);
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}
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let hsl = WI.Color.hsv2hsl(this._hue, this._saturation, this._brightness);
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return new WI.Color(WI.Color.Format.HSL, hsl);
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}
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return new WI.Color(WI.Color.Format.HSLA, [0, 0, 0, 0]);
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}
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set tintedColor(tintedColor)
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{
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console.assert(tintedColor instanceof WI.Color);
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this._gamut = tintedColor.gamut;
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let [hue, saturation, value] = WI.Color.rgb2hsv(...tintedColor.normalizedRGB);
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let x = saturation / 100 * this._dimension;
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let y = (1 - (value / 100)) * this._dimension;
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if (this._gamut === WI.Color.Gamut.DisplayP3)
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this._drawSRGBOutline();
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this._setCrosshairPosition(new WI.Point(x, y));
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this._updateBaseColor();
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}
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// Protected
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handleEvent(event)
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{
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switch (event.type) {
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case "mousedown":
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this._handleMousedown(event);
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break;
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case "mousemove":
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this._handleMousemove(event);
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break;
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case "mouseup":
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this._handleMouseup(event);
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break;
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}
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}
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// Private
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get _saturation()
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{
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let saturation = this._x / this._dimension;
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return Number.constrain(saturation, 0, 1) * 100;
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}
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get _brightness()
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{
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let brightness = 1 - (this._y / this._dimension);
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return Number.constrain(brightness, 0, 1) * 100;
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}
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_handleMousedown(event)
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{
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if (event.button !== 0 || event.ctrlKey)
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return;
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window.addEventListener("mousemove", this, true);
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window.addEventListener("mouseup", this, true);
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this._updateColorForMouseEvent(event);
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// Prevent text selection.
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event.stop();
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this._element.focus();
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}
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_handleMousemove(event)
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{
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this._updateColorForMouseEvent(event);
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}
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_handleMouseup(event)
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{
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window.removeEventListener("mousemove", this, true);
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window.removeEventListener("mouseup", this, true);
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}
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_handleKeyDown(event)
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{
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let dx = 0;
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let dy = 0;
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let step = event.shiftKey ? 10 : 1;
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switch (event.keyIdentifier) {
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case "Right":
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dx += step;
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break;
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case "Left":
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dx -= step;
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break;
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case "Down":
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dy += step;
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break;
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case "Up":
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dy -= step;
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break;
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}
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if (dx || dy) {
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event.preventDefault();
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this._setCrosshairPosition(new WI.Point(this._x + dx, this._y + dy));
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if (this._delegate && this._delegate.colorSquareColorDidChange)
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this._delegate.colorSquareColorDidChange(this);
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}
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}
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_updateColorForMouseEvent(event)
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{
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let rect = this._element.getBoundingClientRect();
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this._setCrosshairPosition({
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x: event.pageX - rect.x,
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y: event.pageY - rect.y,
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});
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if (this._delegate && this._delegate.colorSquareColorDidChange)
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this._delegate.colorSquareColorDidChange(this);
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}
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_setCrosshairPosition(point)
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{
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this._crosshairPosition = point;
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this._x = Number.constrain(Math.round(point.x), 0, this._dimension);
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this._y = Number.constrain(Math.round(point.y), 0, this._dimension);
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this._crosshairElement.style.setProperty("transform", `translate(${this._x}px, ${this._y}px)`);
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this._updateCrosshairBackground();
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}
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_updateBaseColor()
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{
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if (this._gamut === WI.Color.Gamut.DisplayP3) {
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let [r, g, b] = WI.Color.hsl2rgb(this._hue, 100, 50);
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this._element.style.backgroundColor = `color(display-p3 ${r / 255} ${g / 255} ${b / 255})`;
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} else
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this._element.style.backgroundColor = `hsl(${this._hue}, 100%, 50%)`;
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this._updateCrosshairBackground();
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if (this._gamut === WI.Color.Gamut.DisplayP3)
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this._drawSRGBOutline();
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}
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_updateCrosshairBackground()
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{
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this._crosshairElement.style.backgroundColor = this.tintedColor.toString();
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}
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_drawSRGBOutline()
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{
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if (!this._svgElement) {
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this._srgbLabelElement = this._element.appendChild(document.createElement("span"));
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this._srgbLabelElement.className = "srgb-label";
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this._srgbLabelElement.textContent = WI.unlocalizedString("sRGB");
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this._srgbLabelElement.title = WI.UIString("Edge of sRGB color space", "Label for a guide within the color picker");
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const svgNamespace = "http://www.w3.org/2000/svg";
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this._svgElement = this._element.appendChild(document.createElementNS(svgNamespace, "svg"));
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this._svgElement.classList.add("svg-root");
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this._polylineElement = this._svgElement.appendChild(document.createElementNS(svgNamespace, "polyline"));
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this._polylineElement.classList.add("srgb-edge");
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}
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let points = [];
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let step = 1 / window.devicePixelRatio;
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let x = 0;
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for (let y = 0; y < this._dimension; y += step) {
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let value = 100 - ((y / this._dimension) * 100);
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// Optimization: instead of starting from x = 0, we can benefit from the fact that the next point
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// always has x >= of the current x. This minimizes processing time over 100 times.
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for (; x < this._dimension; x += step) {
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let saturation = x / this._dimension * 100;
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let rgb = WI.Color.hsv2rgb(this._hue, saturation, value);
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let srgb = WI.Color.displayP3toSRGB(rgb[0], rgb[1], rgb[2]);
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if (srgb.some((value) => value < 0 || value > 1)) {
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// The point is outside of sRGB.
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points.push({x, y});
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break;
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}
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}
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}
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if (points.lastValue.y < this._dimension * 0.95) {
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// For `color(display-p3 0 0 1)`, the line is almost horizontal.
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// Position the label directly under the line.
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points.push({x: this._dimension, y: points.lastValue.y});
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this._srgbLabelElement.style.removeProperty("bottom");
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this._srgbLabelElement.style.top = `${points.lastValue.y}px`;
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} else {
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this._srgbLabelElement.style.removeProperty("top");
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this._srgbLabelElement.style.bottom = "0px";
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}
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this._srgbLabelElement.style.right = `${this._dimension - points.lastValue.x}px`;
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this._polylineElement.points.clear();
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for (let {x, y} of points) {
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let svgPoint = this._svgElement.createSVGPoint();
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svgPoint.x = x;
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svgPoint.y = y;
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this._polylineElement.points.appendItem(svgPoint);
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}
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}
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};
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