mirror of https://github.com/miniflux/v2.git
98 lines
3.0 KiB
JavaScript
98 lines
3.0 KiB
JavaScript
class TouchHandler {
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constructor() {
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this.reset();
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}
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reset() {
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this.touch = {
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start: {x: -1, y: -1},
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move: {x: -1, y: -1},
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element: null
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};
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}
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calculateDistance() {
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if (this.touch.start.x >= -1 && this.touch.move.x >= -1) {
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let horizontalDistance = Math.abs(this.touch.move.x - this.touch.start.x);
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let verticalDistance = Math.abs(this.touch.move.y - this.touch.start.y);
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if (horizontalDistance > 30 && verticalDistance < 70) {
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return this.touch.move.x - this.touch.start.x;
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}
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}
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return 0;
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}
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findElement(element) {
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if (element.classList.contains("touch-item")) {
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return element;
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}
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return DomHelper.findParent(element, "touch-item");
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}
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onTouchStart(event) {
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if (event.touches === undefined || event.touches.length !== 1) {
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return;
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}
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this.reset();
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this.touch.start.x = event.touches[0].clientX;
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this.touch.start.y = event.touches[0].clientY;
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this.touch.element = this.findElement(event.touches[0].target);
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}
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onTouchMove(event) {
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if (event.touches === undefined || event.touches.length !== 1 || this.element === null) {
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return;
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}
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this.touch.move.x = event.touches[0].clientX;
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this.touch.move.y = event.touches[0].clientY;
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let distance = this.calculateDistance();
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let absDistance = Math.abs(distance);
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if (absDistance > 0) {
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let opacity = 1 - (absDistance > 75 ? 0.9 : absDistance / 75 * 0.9);
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let tx = distance > 75 ? 75 : (distance < -75 ? -75 : distance);
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this.touch.element.style.opacity = opacity;
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this.touch.element.style.transform = "translateX(" + tx + "px)";
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event.preventDefault();
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}
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}
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onTouchEnd(event) {
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if (event.touches === undefined) {
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return;
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}
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if (this.touch.element !== null) {
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let distance = Math.abs(this.calculateDistance());
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if (distance > 75) {
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EntryHandler.toggleEntryStatus(this.touch.element);
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}
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this.touch.element.style.opacity = 1;
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this.touch.element.style.transform = "none";
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}
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this.reset();
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}
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listen() {
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let elements = document.querySelectorAll(".touch-item");
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let hasPassiveOption = DomHelper.hasPassiveEventListenerOption();
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elements.forEach((element) => {
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element.addEventListener("touchstart", (e) => this.onTouchStart(e), hasPassiveOption ? { passive: true } : false);
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element.addEventListener("touchmove", (e) => this.onTouchMove(e), hasPassiveOption ? { passive: false } : false);
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element.addEventListener("touchend", (e) => this.onTouchEnd(e), hasPassiveOption ? { passive: true } : false);
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element.addEventListener("touchcancel", () => this.reset(), hasPassiveOption ? { passive: true } : false);
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});
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}
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}
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