import { AfterViewInit, ChangeDetectorRef, Component, ElementRef, Input, OnChanges, SimpleChanges, ViewChild } from "@angular/core"; import {IconsService} from "./icons.service"; export interface StopRule { class: string, offset: number } /** * By default this component uses Material Icons Library to render an icon with * a specific @name. For custom icons you should: * * - Add your icon in icons.ts and register it to Icon registry, by adding this to your component Module. * * e.g export class ExampleModule { * constructor(private iconsService: IconsService) { * this.iconsService.registerIcons([arrow_right]) * } * } * * If the name of your icon is the same with a Material Icon name, yours will be used instead of the default. * * - Custom SVG Icon. Define a variable in your component with an SVG and give it as Input @svg. * * In case of SVGs, there is an opportunity to add gradient color by define at least a start and end stop-color rules * and an id to support them. This option is enabled by giving id as input in @gradient (Optional @degrees for gradient direction) * * e.g #gradient .start { * stop-color: red; * } * * e.g #gradient .end { * stop-color: orange; * } * * */ @Component({ selector: 'icon', template: ` {{iconName}} {{visuallyHidden}} ` }) export class IconsComponent implements AfterViewInit, OnChanges { private static DEFAULT_ICON_SIZE = 20; public iconName: string; public style; /** * Custom icon as SVG */ @Input() public svg; @Input() public defaultSize = false; /** * True if this icon should have display flex (Optional, Default: false) * * */ @Input() public flex = false; /** * * Add custom class(es)(Optional) * */ @Input() public customClass = ''; /** * Color of svg (Optional) * */ @Input() public fill; /** * Color of svg stroke (Optional) * */ @Input() public stroke; /** * Size of icon (Default: 1) * * Disabled if defaultSize = true * */ @Input() public ratio = 1; /** * In case of Material icon only. Type of icon (Optional) * */ @Input() public type: "outlined" | "round" | "sharp" | "two-tone" | null = null; /** * Name of icon in registry (Required) * */ @Input() set name(iconName: string) { this.iconName = iconName; this.svg = this.iconsService.getIcon(iconName); } /** * Set visually hidden name for accessibility * */ @Input() public visuallyHidden: string = null; /** * Gradient rules * Available only for SVG! * * Define your css rules for stop-colors * */ @Input() public gradient: string = null; @Input() public degrees: number = 0; @Input() public stopRules: StopRule[]= [{class: 'start', offset: 0}, {class: 'end', offset: 100}]; @ViewChild("icon") public icon: ElementRef; constructor(private iconsService: IconsService, private cdr: ChangeDetectorRef) {} ngAfterViewInit() { this.initIcon(); } ngOnChanges(changes: SimpleChanges) { this.initIcon(); } initIcon() { if(this.svg && this.icon) { this.cdr.detectChanges(); let svg: Element = this.icon.nativeElement.getElementsByTagName('svg').item(0); if(!this.defaultSize && svg) { svg.setAttribute("width", (this.ratio * IconsComponent.DEFAULT_ICON_SIZE).toString()); svg.setAttribute("height", (this.ratio * IconsComponent.DEFAULT_ICON_SIZE).toString()); } if(this.gradient && svg) { this.addGradient(svg); } else { this.style = { fill: this.fill, stroke: this.stroke }; } } else { this.style = { "font-size.px": this.ratio*IconsComponent.DEFAULT_ICON_SIZE }; } this.cdr.detectChanges(); } addGradient(svg: Element) { if(svg.children.length > 0 && typeof document !== "undefined") { let gradientDefinition = document.createElementNS('http://www.w3.org/2000/svg', 'linearGradient'); gradientDefinition.setAttribute('id', this.gradient); if(this.degrees !== 0) { let angle = (this.degrees) * (Math.PI / 180); gradientDefinition.setAttribute('x1', Math.round(50 + Math.sin(angle + Math.PI) * 50) + '%'); gradientDefinition.setAttribute('y1', Math.round(50 + Math.cos(angle + Math.PI) * 50) + '%'); gradientDefinition.setAttribute('x2', Math.round(50 + Math.sin(angle) * 50) + '%'); gradientDefinition.setAttribute('y2', Math.round(50 + Math.cos(angle) * 50) + '%'); } for(let rule of this.stopRules) { let item = document.createElementNS('http://www.w3.org/2000/svg','stop'); item.setAttribute('class', rule.class); item.setAttribute('offset', rule.offset + '%'); gradientDefinition.appendChild(item); } let defs = document.createElementNS('http://www.w3.org/2000/svg','defs'); defs.appendChild(gradientDefinition); for(let i = 0; i < svg.children.length; i++) { let item = svg.children.item(i); if(!item.hasAttribute('fill')) { item.setAttribute('fill', "url('#" + this.gradient + "')"); } } svg.insertBefore(defs, svg.childNodes[0]); } } }