391 lines
14 KiB
JavaScript
391 lines
14 KiB
JavaScript
/*eslint no-console: "off"*/
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/*eslint no-trailing-spaces: "off"*/
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/**
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* Copies defined properties in to, over from the from object. Does so recursively
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* Ysed to copy user defined parameters onto a pre-existing object with defaults preset.
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* @param {Object} to The object to copy to
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* @param {Object} from The object tp copy from (but only the properties already named in "to")
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*/
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const specsCopy = (to, from) => {
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for(const ix in to){
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if(from.hasOwnProperty(ix)){
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if( typeof to[ix] == "object"
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&& typeof from[ix] == "object")
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{
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if(Array.isArray(to[ix])){
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if(Array.isArray(from[ix])){
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to[ix] = Array.from(from[ix]);
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} // else, skip...
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} else {
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specsCopy(to[ix], from[ix]); // recursive copy
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}
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}
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else {
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to[ix] = from[ix];
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}
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}
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}
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};
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const debounce = (func, delay) => {
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let timer;
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return function(...args) {
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const context = this;
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clearTimeout(timer);
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timer = setTimeout(() => {
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func.apply(context, args);
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}, delay)
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}
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}
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/**
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* Get the position of an element relative to another
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* @param {HTMLElement} el The element whose position to determine
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* @param {HTMLElement} reference Relative to this element
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* @returns
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*/
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const getElementPosition = (el, reference) => {
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if(!el || !(el instanceof HTMLElement)){
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// Always return 0,0 if the element is invalid
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return {x: 0, y: 0};
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}
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if (!reference || !(reference instanceof HTMLElement)){
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// Take the document body as reference if the reference is invalud
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reference = document.querySelector("body");
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}
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if( el.offsetParent === reference){
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// easily done if the reference element is also the offsetParent..
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return {x: el.offsetLeft, y: el.offsetTop};
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} else {
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const elR = el.getBoundingClientRect();
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const refR = reference.getBoundingClientRect();
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return {x: elR.left - refR.left,
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y: elR.top - refR.top};
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}
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};
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/**
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* Check if an element is a containing element and can thus be a parent for absolute positioning
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* Which is the cas if the element has
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* 1 A position value other than static (fixed, absolute, relative, or sticky).
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* 2 A transform or perspective value other than none
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* 3 A will-change value of transform or perspective
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* 4 A filter value other than none or a will-change value of filter (only works on Firefox)
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* 5 A contain value of layout, paint, strict or content (e.g. contain: paint;)
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* 6 A container-type value other than normal
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* 7 A backdrop-filter other than none (e.g. backdrop-filter: blur(10px);)
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* @param {HTMLElement} el
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* @returns {Boolean}
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*/
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/*
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function isContainingElement(el) {
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const cssStyle = getComputedStyle(el);
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return ["fixed","absolute","relative","sticky",].includes(cssStyle.position)
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|| cssStyle.transform !== "none"
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|| cssStyle.perspective !== "none"
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|| ["transform","perspective"].includes(cssStyle.willChange)
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|| cssStyle.filter !== "none"
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|| cssStyle.contain == "paint"
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|| cssStyle.backdropFilter !== "none";
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}
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*/
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export class SimpleLine {
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static idCounter = 0;
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constructor(start, end, specs){
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this.svg = null;
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this.id = SimpleLine.idCounter++;
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// setup defaults
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this.specs = {
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autorefresh: 10,
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class: "",
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anchors: {
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// top, middle, bottom
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// left, center, right
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start: ["middle","right"],
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end: ["middle", "left"],
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},
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gravity: {
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start: 1,
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end: 1,
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},
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stroke: "4px",
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};
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if(specs && typeof specs == "object"){
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specsCopy(this.specs,specs);
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}
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// Validate start element
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if(start instanceof HTMLElement) {
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this.start = start;
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} else if (typeof start === 'string' || this.start instanceof String) {
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this.startSelector = start;
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this.start = document.querySelector(start);
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if(!(this.start instanceof HTMLElement)){
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console.error("Cannot find start element:",start);
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return;
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}
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} else {
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console.error("Start element not string or dom element",start);
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return;
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}
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// Validate end element
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if(end instanceof HTMLElement) {
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this.end = end;
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} else if (typeof end === 'string' || this.end instanceof String) {
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this.endSelector = end;
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this.end = document.querySelector(end);
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if(!(this.end instanceof HTMLElement)){
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console.error("Cannot find end element:",end);
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return;
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}
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} else {
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console.error("End element not string or dom element",start);
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return;
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}
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// create observers for both elements
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this.resizeObserver = new ResizeObserver(debounce(() => {
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this.update();
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},20));
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this.resizeObserver.observe(this.start);
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this.resizeObserver.observe(this.end);
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this.positionCheck(); // Initialize refresh
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if(this.specs.autorefresh > 0){
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const refresh = () => {
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setTimeout(refresh,this.specs.autorefresh);
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this.positionCheck(); // Check if position ch
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};
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setTimeout(refresh,this.specs.autorefresh);
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}
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this.update(); // fist draw
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}
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positionCheck(){
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const startPos = {x: this.start.offsetLeft, y: this.start.offsetTop};
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const endPos = {x: this.end.offsetLeft, y: this.end.offsetTop};
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let needUpdate = false;
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if(this.startPos){
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needUpdate |= (this.startPos.x != startPos.x || this.startPos.y != startPos.y);
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console.info("Offset position changed for",this.start);
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}
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this.startPos = startPos;
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if(this.endPos){
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needUpdate |= (this.endPos.x != endPos.x || this.endPos.y != endPos.y);
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console.info("Offset position changed for",this.end);
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}
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this.endPos = endPos;
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if(needUpdate){
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this.update();
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}
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}
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getContainer(){
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// Validate or determine container
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let container = this.start.offsetParent;
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if(!container) {
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if(document.getComputedStyle(this.start).position == "fixed"){
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container = document.querySelector("body");
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} else {
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console.error("Start element has no offsetParent. likely ");
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}
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}
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return container;
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}
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getAnchorPoint(anchor){
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let el = this.start;
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if(anchor != "start"){
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anchor = "end";
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el = this.end;
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}
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let x, dirX;
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let y, dirY;
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// determine start coordinates
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if(this.specs.anchors[anchor].includes("left")){
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x = 0;
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dirX = -1;
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} else if (this.specs.anchors[anchor].includes("right")) {
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x = el.offsetWidth -1;
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dirX = 1;
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} else { // center
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x = el.offsetWidth / 2;
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dirX = 0;
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}
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if(this.specs.anchors[anchor].includes("top")){
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y = 0;
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dirY = 1;
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} else if (this.specs.anchors[anchor].includes("bottom")) {
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y = el.offsetHeight -1;
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dirY = -1;
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} else { // middle
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y = el.offsetHeight / 2;
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dirY = 0;
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}
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return { x: x, y: y, dir: {x: dirX, y: dirY}};
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}
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svgDefs(){
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const defs = document.createElementNS("http://www.w3.org/2000/svg", "defs");
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const marker = document.createElementNS("http://www.w3.org/2000/svg", "marker");
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marker.setAttribute("id",`simpleline-${this.id}-arrow`);
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marker.setAttribute("markerUnits",`strokeWidth`);
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marker.setAttribute("viewBox",`-8 -8 16 16`);
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marker.setAttribute("orient",`auto`);
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marker.setAttribute("markerWidth",`4`);
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marker.setAttribute("markerHeight",`4`);
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defs.appendChild(marker);
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const polygon = document.createElementNS("http://www.w3.org/2000/svg", "polygon");
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polygon.setAttribute("fill",`currentColor`);
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polygon.setAttribute("points",`-8,-8 8,0 -8,8 -5,0`);
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marker.append(polygon);
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return defs;
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}
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update(){
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const container = this.getContainer();
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if (!container) { return; } // Do not create any svg if container is empty
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if(this.svg && (this.svg instanceof SVGElement)){
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if(container !== this.svg.offsetParent){
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// update the svg's parent if the container was changed
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container.appendChild(this.svg);
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}
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} else {
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this.svg = document.createElementNS('http://www.w3.org/2000/svg','svg');
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this.svg.setAttribute("id",`simpleline-${this.id}`);
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this.svg.setAttribute("class",`simpleline ${this.specs.class}`);
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this.svg.style.position = "absolute";
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this.svg.style.pointerEvents = 'none';
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container.appendChild(this.svg);
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this.svg.appendChild(this.svgDefs()); // create a new defs element and add it to the svg
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// Add the marker definitions
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}
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// determine proper x, y ,h and w
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const startAnchor = this.getAnchorPoint("start");
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const endAnchor = this.getAnchorPoint("end");
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const elStartPos = getElementPosition(this.start,container);
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const elEndPos = getElementPosition(this.end,container);
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console.info("startAnchor",startAnchor);
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console.info("endAnchor",endAnchor);
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console.info("elStartPos",elStartPos);
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console.info("elEndPos",elEndPos);
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// Determine basic h/w between start and end anchor to help determine desired control point length
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const w = Math.max(elStartPos.x + startAnchor.x,elEndPos.x + endAnchor.x)
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- Math.min(elStartPos.x + startAnchor.x,elEndPos.x + endAnchor.x);
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const h = Math.max(elStartPos.y + startAnchor.y,elEndPos.x + endAnchor.y)
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- Math.min(elStartPos.y + startAnchor.y,elEndPos.x + endAnchor.y);
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// Determine start positions and end positions relative to container
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const cStartPos = {
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x: elStartPos.x + startAnchor.x,
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y: elStartPos.y + startAnchor.y,
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dirx: elStartPos.x + startAnchor.x + startAnchor.dir.x * this.specs.gravity.start * (w/2),
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diry: elStartPos.y + startAnchor.y + startAnchor.dir.y * this.specs.gravity.start * (h/2),
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};
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const cEndPos = {
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x: elEndPos.x + endAnchor.x,
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y: elEndPos.y + endAnchor.y,
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dirx: elEndPos.x + endAnchor.x + endAnchor.dir.x * this.specs.gravity.end * (w/2),
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diry: elEndPos.y + endAnchor.y + endAnchor.dir.y * this.specs.gravity.end * (h/2),
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};
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// determine the bounding rectangle of the
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console.info("cStartPos",cStartPos);
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console.info("cEndPos",cEndPos);
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const margin = (!isNaN(this.specs.stroke)?5*this.specs.stroke:25);
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const bounds = {
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x: Math.min(cStartPos.x,cEndPos.x,cStartPos.dirx,cEndPos.dirx) - margin,
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y: Math.min(cStartPos.y,cEndPos.y,cStartPos.diry,cEndPos.diry) - margin,
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w: Math.max(cStartPos.x,cEndPos.x,cStartPos.dirx,cEndPos.dirx)
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- Math.min(cStartPos.x,cEndPos.x,cStartPos.dirx,cEndPos.dirx) + 2*margin,
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h: Math.max(cStartPos.y,cEndPos.y,cStartPos.diry,cEndPos.diry)
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- Math.min(cStartPos.y,cEndPos.y,cStartPos.diry,cEndPos.diry) + 2*margin,
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};
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// Now convert the coordinates to the svg space
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const startPos = {
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x: cStartPos.x - bounds.x,
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y: cStartPos.y - bounds.y,
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dirx: cStartPos.dirx - bounds.x,
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diry: cStartPos.diry - bounds.y,
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};
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const endPos = {
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x: cEndPos.x - bounds.x,
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y: cEndPos.y - bounds.y,
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dirx: cEndPos.dirx - bounds.x,
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diry: cEndPos.diry - bounds.y,
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};
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console.info("Bounds",bounds);
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console.info("startPos",startPos);
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console.info("endPos",endPos);
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// Update the svg attributes
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this.svg.setAttribute("viewBox",`0 0 ${bounds.w}, ${bounds.h}`);
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this.svg.setAttribute("width",`${bounds.w}px`);
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this.svg.setAttribute("height",`${bounds.h}px`);
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// Reposition the SVG relative to the container
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this.svg.style.left = `${bounds.x}px`;
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this.svg.style.top = `${bounds.y}px`;
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this.svg.style.width = `${bounds.w}px`;
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this.svg.style.height = `${bounds.h}px`;
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// Draw the line
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if(!this.line){
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this.line = document.createElementNS("http://www.w3.org/2000/svg", "path");
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this.line.setAttribute("marker-end",`url(#simpleline-${this.id}-arrow)`);
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this.svg.appendChild(this.line);
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}
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let strokeWidth = this.specs.stroke;
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if(!isNaN(strokeWidth) && strokeWidth != 0){
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strokeWidth = `${strokeWidth}px`;
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}
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this.line.style.stroke = "currentColor"
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this.line.style.fill = "none"
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this.line.style.strokeWidth= strokeWidth;
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this.line.setAttribute('d',
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`M ${startPos.x} ${startPos.y}
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C ${startPos.dirx} ${startPos.diry}, ${endPos.dirx} ${endPos.diry}, ${endPos.x} ${endPos.y}`);
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}
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remove(){
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// remove the line
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this.svg.remove();
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this.svg = null;
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this.line = null;
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this.resizeObserver.unobserve(this.start);
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this.resizeObserver.unobserve(this.end);
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this.mutationObserver.unobserve(this.start);
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this.mutationObserver.unobserve(this.end);
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}
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}
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