535 lines
16 KiB
TypeScript
535 lines
16 KiB
TypeScript
export type ResizeObserverEntryCallback = (entry: ResizeObserverEntry) => void;
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class ResizeObserverManager {
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#elementMap = new WeakMap<Element, Set<ResizeObserverEntryCallback>>();
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#elementEntry = new WeakMap<Element, ResizeObserverEntry>();
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#vo = new ResizeObserver((entries) => {
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for (const entry of entries) {
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this.#elementEntry.set(entry.target, entry);
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this.#elementMap.get(entry.target)?.forEach((callback) => callback(entry));
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}
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});
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observe(target: Element, callback: ResizeObserverEntryCallback): void {
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let callbacks = this.#elementMap.get(target);
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if (callbacks === undefined) {
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this.#vo.observe(target);
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this.#elementMap.set(target, (callbacks = new Set()));
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} else {
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const entry = this.#elementEntry.get(target);
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if (entry) {
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callback(entry);
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}
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}
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callbacks.add(callback);
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}
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unobserve(target: Element, callback: ResizeObserverEntryCallback): void {
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const callbacks = this.#elementMap.get(target);
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if (callbacks === undefined) return;
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callbacks.delete(callback);
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if (callbacks.size === 0) {
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this.#vo.unobserve(target);
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this.#elementMap.delete(target);
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}
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}
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}
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const resizeObserver = new ResizeObserverManager();
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export type Shape = 'rectangle' | 'circle' | 'triangle';
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export type MoveEventDetail = { movementX: number; movementY: number };
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export class MoveEvent extends CustomEvent<MoveEventDetail> {
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constructor(detail: MoveEventDetail) {
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super('move', { detail, cancelable: true, bubbles: true });
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}
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}
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export type ResizeEventDetail = { movementX: number; movementY: number };
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export class ResizeEvent extends CustomEvent<MoveEventDetail> {
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constructor(detail: MoveEventDetail) {
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super('resize', { detail, cancelable: true, bubbles: true });
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}
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}
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export type RotateEventDetail = { rotate: number };
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export class RotateEvent extends CustomEvent<RotateEventDetail> {
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constructor(detail: RotateEventDetail) {
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super('rotate', { detail, cancelable: true, bubbles: true });
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}
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}
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export type Dimension = number | 'auto';
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const styles = new CSSStyleSheet();
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styles.replaceSync(`
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:host {
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display: block;
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position: absolute;
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cursor: var(--fc-move, move);
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box-sizing: border-box;
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}
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:host::before {
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content: '';
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position: absolute;
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inset: -15px -15px -15px -15px;
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z-index: -1;
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}
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div {
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height: 100%;
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width: 100%;
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overflow: hidden;
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cursor: default;
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}
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:host(:focus-within) {
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z-index: calc(infinity - 1);
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outline: solid 1px hsl(214, 84%, 56%);
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}
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:host(:hover) {
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outline: solid 2px hsl(214, 84%, 56%);
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}
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:host(:state(move)),
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:host(:state(rotate)),
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:host(:state(resize-nw)),
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:host(:state(resize-ne)),
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:host(:state(resize-se)),
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:host(:state(resize-sw)), {
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user-select: none;
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}
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[part="resize-nw"],
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[part="resize-ne"],
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[part="resize-se"],
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[part="resize-sw"] {
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display: block;
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position: absolute;
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box-sizing: border-box;
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padding: 0;
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background: hsl(210, 20%, 98%);
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z-index: calc(infinity);
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width: 13px;
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aspect-ratio: 1;
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transform: translate(-50%, -50%);
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border: 1.5px solid hsl(214, 84%, 56%);
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border-radius: 2px;
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}
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[part="resize-nw"] {
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top: 0;
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left: 0;
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}
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[part="resize-ne"] {
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top: 0;
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left: 100%;
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}
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[part="resize-se"] {
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top: 100%;
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left: 100%;
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}
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[part="resize-sw"] {
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top: 100%;
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left: 0;
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}
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[part="resize-nw"], [part="resize-se"] {
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cursor: var(--fc-nwse-resize, nwse-resize)
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}
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[part="resize-ne"], [part="resize-sw"] {
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cursor: var(--fc-nesw-resize, nesw-resize)
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}
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[part="rotate"] {
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z-index: calc(infinity);
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display: block;
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position: absolute;
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box-sizing: border-box;
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padding: 0;
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border: 1.5px solid hsl(214, 84%, 56%);
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border-radius: 50%;
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background: hsl(210, 20%, 98%);
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width: 13px;
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aspect-ratio: 1;
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top: 0;
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left: 50%;
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translate: -50% -150%;
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cursor: url("data:image/svg+xml,<svg height='32' width='32' viewBox='0 0 32 32' xmlns='http://www.w3.org/2000/svg' style='color: black;'><defs><filter id='shadow' y='-40%' x='-40%' width='180px' height='180%' color-interpolation-filters='sRGB'><feDropShadow dx='1' dy='1' stdDeviation='1.2' flood-opacity='.5'/></filter></defs><g fill='none' transform='rotate(45 16 16)' filter='url(%23shadow)'><path d='M22.4789 9.45728L25.9935 12.9942L22.4789 16.5283V14.1032C18.126 14.1502 14.6071 17.6737 14.5675 22.0283H17.05L13.513 25.543L9.97889 22.0283H12.5674C12.6071 16.5691 17.0214 12.1503 22.4789 12.1031L22.4789 9.45728Z' fill='black'/><path fill-rule='evenodd' clip-rule='evenodd' d='M21.4789 7.03223L27.4035 12.9945L21.4789 18.9521V15.1868C18.4798 15.6549 16.1113 18.0273 15.649 21.0284H19.475L13.5128 26.953L7.55519 21.0284H11.6189C12.1243 15.8155 16.2679 11.6677 21.4789 11.1559L21.4789 7.03223ZM22.4789 12.1031C17.0214 12.1503 12.6071 16.5691 12.5674 22.0284H9.97889L13.513 25.543L17.05 22.0284H14.5675C14.5705 21.6896 14.5947 21.3558 14.6386 21.0284C15.1157 17.4741 17.9266 14.6592 21.4789 14.1761C21.8063 14.1316 22.1401 14.1069 22.4789 14.1032V16.5284L25.9935 12.9942L22.4789 9.45729L22.4789 12.1031Z' fill='white'/></g></svg>") 16 16, pointer;
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}
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:host(:not(:focus-within)) [part^="resize"], :host(:not(:focus-within)) [part="rotate"] {
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opacity: 0;
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cursor: default;
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}
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`);
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declare global {
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interface HTMLElementTagNameMap {
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'fc-geometry': FolkGeometry;
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}
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}
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// TODO: add z coordinate?
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export class FolkGeometry extends HTMLElement {
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static tagName = 'fc-geometry';
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static register() {
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customElements.define(this.tagName, this);
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}
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#internals = this.attachInternals();
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#type = (this.getAttribute('type') || 'rectangle') as Shape;
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get type(): Shape {
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return this.#type;
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}
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set type(type: Shape) {
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this.setAttribute('type', type);
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}
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#previousX = 0;
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#x = Number(this.getAttribute('x')) || 0;
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get x() {
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return this.#x;
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}
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set x(x) {
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this.#previousX = this.#x;
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this.#x = x;
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this.#requestUpdate('x');
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}
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#previousY = 0;
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#y = Number(this.getAttribute('y')) || 0;
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get y() {
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return this.#y;
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}
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set y(y) {
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this.#previousY = this.#y;
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this.#y = y;
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this.#requestUpdate('y');
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}
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#autoContentRect = this.getBoundingClientRect();
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#previousWidth: Dimension = 0;
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#width: Dimension = 0;
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get width(): number {
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if (this.#width === 'auto') {
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return this.#autoContentRect.width;
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}
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return this.#width;
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}
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set width(width: Dimension) {
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if (width === 'auto') {
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resizeObserver.observe(this, this.#onResize);
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} else if (this.#width === 'auto' && this.#height !== 'auto') {
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resizeObserver.unobserve(this, this.#onResize);
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}
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this.#previousWidth = this.#width;
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this.#width = width;
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this.#requestUpdate('width');
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}
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#previousHeight: Dimension = 0;
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#height: Dimension = 0;
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get height(): number {
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if (this.#height === 'auto') {
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return this.#autoContentRect.height;
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}
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return this.#height;
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}
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set height(height: Dimension) {
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if (height === 'auto') {
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resizeObserver.observe(this, this.#onResize);
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} else if (this.#height === 'auto' && this.#width !== 'auto') {
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resizeObserver.unobserve(this, this.#onResize);
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}
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this.#previousHeight = this.#height;
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this.#height = height;
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this.#requestUpdate('height');
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}
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#initialRotation = 0;
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#startAngle = 0;
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#previousRotate = 0;
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#rotate = Number(this.getAttribute('rotate')) || 0;
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get rotate(): number {
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return this.#rotate;
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}
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set rotate(rotate: number) {
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this.#previousRotate = this.#rotate;
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this.#rotate = rotate;
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this.#requestUpdate('rotate');
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}
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constructor() {
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super();
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this.addEventListener('pointerdown', this);
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const shadowRoot = this.attachShadow({
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mode: 'open',
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delegatesFocus: true,
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});
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shadowRoot.adoptedStyleSheets.push(styles);
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// Ideally we would creating these lazily on first focus, but the resize handlers need to be around for delegate focus to work.
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// Maybe can add the first resize handler here, and lazily instantiate the rest when needed?
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// I can see it becoming important at scale
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shadowRoot.innerHTML = `
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<button part="rotate"></button>
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<button part="resize-nw"></button>
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<button part="resize-ne"></button>
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<button part="resize-se"></button>
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<button part="resize-sw"></button>
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<div><slot></slot></div>`;
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this.height = Number(this.getAttribute('height')) || 'auto';
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this.width = Number(this.getAttribute('width')) || 'auto';
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}
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connectedCallback() {
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this.#update(new Set(['type', 'x', 'y', 'height', 'width', 'rotate']));
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}
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disconnectedCallback() {
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cancelAnimationFrame(this.#rAFId);
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}
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// Similar to `Element.getClientBoundingRect()`, but returns an SVG path that precisely outlines the shape.
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getBoundingPath(): string {
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return '';
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}
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// We might also want some kind of utility function that maps a path into an approximate set of vertices.
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getBoundingVertices() {
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return [];
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}
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handleEvent(event: PointerEvent) {
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switch (event.type) {
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case 'pointerdown': {
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if (event.button !== 0 || event.ctrlKey) return;
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const target = event.composedPath()[0] as HTMLElement;
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// Store initial angle on rotation start
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if (target.getAttribute('part') === 'rotate') {
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// We need to store initial rotation/angle somewhere.
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// This is a little awkward as we'll want to do *quite a lot* of this kind of thing.
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// Might be an argument for making elements dumber (i.e. not have them manage their own state) and do this from the outside.
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// But we also want to preserve the self-sufficient nature of elements' behaviour...
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// Maybe some kind of shared utility, used by both the element and the outside environment?
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this.#initialRotation = this.#rotate;
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const centerX = this.#x + this.width / 2;
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const centerY = this.#y + this.height / 2;
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this.#startAngle = Math.atan2(event.clientY - centerY, event.clientX - centerX);
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}
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// ignore interactions from slotted elements.
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if (target !== this && !target.hasAttribute('part')) return;
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target.addEventListener('pointermove', this);
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this.addEventListener('lostpointercapture', this);
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target.setPointerCapture(event.pointerId);
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const interaction = target.getAttribute('part') || 'move';
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this.#internals.states.add(interaction);
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this.focus();
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return;
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}
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case 'pointermove': {
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const target = event.target as HTMLElement;
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if (target === null) return;
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if (target === this) {
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this.x += event.movementX;
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this.y += event.movementY;
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return;
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}
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const part = target.getAttribute('part');
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if (part === null) return;
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if (part.includes('resize')) {
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// This triggers a move and resize event :(
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if (part.includes('-n')) {
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this.y += event.movementY;
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this.height -= event.movementY;
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}
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if (part.endsWith('e')) {
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this.width += event.movementX;
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}
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if (part.includes('-s')) {
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this.height += event.movementY;
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}
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if (part.endsWith('w')) {
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this.x += event.movementX;
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this.width -= event.movementX;
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}
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return;
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}
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if (part === 'rotate') {
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const centerX = this.#x + this.width / 2;
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const centerY = this.#y + this.height / 2;
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const currentAngle = Math.atan2(event.clientY - centerY, event.clientX - centerX);
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const deltaAngle = currentAngle - this.#startAngle;
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this.rotate = this.#initialRotation + (deltaAngle * 180) / Math.PI;
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return;
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}
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return;
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}
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case 'lostpointercapture': {
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const target = event.composedPath()[0] as HTMLElement;
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const interaction = target.getAttribute('part') || 'move';
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this.#internals.states.delete(interaction);
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target.removeEventListener('pointermove', this);
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this.removeEventListener('lostpointercapture', this);
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return;
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}
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}
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}
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#updatedProperties = new Set<string>();
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#rAFId = -1;
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#isUpdating = false;
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#requestUpdate(property: string) {
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this.#updatedProperties.add(property);
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if (this.#isUpdating) return;
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this.#isUpdating = true;
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this.#rAFId = requestAnimationFrame(() => {
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this.#isUpdating = false;
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this.#update(this.#updatedProperties);
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this.#updatedProperties.clear();
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this.#rAFId = -1;
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});
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}
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// Any updates that should be batched should happen here like updating the DOM or emitting events should be executed here.
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#update(updatedProperties: Set<string>) {
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if (updatedProperties.has('type')) {
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// TODO: Update shape styles. For many shapes, we could just use clip-path to style the shape.
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// If we use relative values in `clip-path: polygon()`, then no JS is needed to style the shape
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// If `clip-path: path()` is used then we need to update the path in JS.
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// See https://www.smashingmagazine.com/2024/05/modern-guide-making-css-shapes/
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}
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if (updatedProperties.has('x') || updatedProperties.has('y')) {
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// Although the change in movement isn't useful inside this component, the outside world might find it helpful to calculate acceleration and other physics
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const notCancelled = this.dispatchEvent(
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new MoveEvent({
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movementX: this.#x - this.#previousX,
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movementY: this.#y - this.#previousY,
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})
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);
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if (notCancelled) {
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if (updatedProperties.has('x')) {
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// In the future, when CSS `attr()` is supported we could define this x/y projection in CSS.
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this.style.left = `${this.#x}px`;
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}
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if (updatedProperties.has('y')) {
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this.style.top = `${this.#y}px`;
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}
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} else {
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this.#x = this.#previousX;
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this.#y = this.#previousY;
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}
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}
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if (updatedProperties.has('width') || updatedProperties.has('height')) {
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// Although the change in resize isn't useful inside this component, the outside world might find it helpful to calculate acceleration and other physics
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const notCancelled = this.dispatchEvent(
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new ResizeEvent({
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movementX: this.width - (this.#previousWidth === 'auto' ? 0 : this.#previousWidth),
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movementY: this.height - (this.#previousHeight === 'auto' ? 0 : this.#previousHeight),
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})
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);
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if (notCancelled) {
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if (updatedProperties.has('width')) {
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this.style.width = this.#width === 'auto' ? '' : `${this.#width}px`;
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}
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if (updatedProperties.has('height')) {
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this.style.height = this.#height === 'auto' ? '' : `${this.#height}px`;
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}
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} else {
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// TODO: Revert changes to position too
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this.#height = this.#previousHeight;
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this.#width = this.#previousWidth;
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}
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}
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if (updatedProperties.has('rotate')) {
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// Although the change in resize isn't useful inside this component, the outside world might find it helpful to calculate acceleration and other physics
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const notCancelled = this.dispatchEvent(new RotateEvent({ rotate: this.#rotate - this.#previousRotate }));
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if (notCancelled) {
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if (updatedProperties.has('rotate')) {
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this.style.rotate = `${this.#rotate}deg`;
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}
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} else {
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this.#rotate = this.#previousRotate;
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}
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}
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}
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#onResize = (entry: ResizeObserverEntry) => {
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const previousRect = this.#autoContentRect;
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this.#autoContentRect = entry.contentRect;
|
|
|
|
const notCancelled = this.dispatchEvent(
|
|
new ResizeEvent({
|
|
movementX: this.width - (this.#previousWidth === 'auto' ? previousRect.width : this.#previousWidth),
|
|
movementY: this.height - (this.#previousHeight === 'auto' ? previousRect.height : this.#previousHeight),
|
|
})
|
|
);
|
|
|
|
if (!notCancelled) {
|
|
if (this.#height === 'auto') {
|
|
this.height = previousRect?.height || 0;
|
|
}
|
|
|
|
if (this.#width === 'auto') {
|
|
this.width = previousRect?.width || 0;
|
|
}
|
|
}
|
|
};
|
|
}
|