mirror of
https://github.com/miniflux/v2.git
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188 lines
6.1 KiB
JavaScript
188 lines
6.1 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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moved: false,
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time: 0,
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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 || this.touch.moved) {
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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("entry-swipe")) {
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return element;
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}
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return element.closest(".entry-swipe");
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}
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onItemTouchStart(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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this.touch.element.style.transitionDuration = "0s";
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}
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onItemTouchMove(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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this.touch.moved = true;
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let tx = absDistance > 75 ? Math.pow(absDistance - 75, 0.5) + 75 : absDistance;
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if (distance < 0) {
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tx = -tx;
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}
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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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onItemTouchEnd(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 absDistance = Math.abs(this.calculateDistance());
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if (absDistance > 75) {
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toggleEntryStatus(this.touch.element);
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}
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if (this.touch.moved) {
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this.touch.element.style.transitionDuration = "0.15s";
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this.touch.element.style.transform = "none";
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}
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}
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this.reset();
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}
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onContentTouchStart(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.time = Date.now();
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}
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onContentTouchMove(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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}
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onContentTouchEnd(event) {
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if (event.touches === undefined) {
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return;
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}
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let distance = this.calculateDistance();
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let absDistance = Math.abs(distance);
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let now = Date.now();
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if (now - this.touch.time <= 1000 && absDistance > 75) {
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if (distance > 0) {
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goToPage("previous");
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} else {
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goToPage("next");
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}
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}
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this.reset();
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}
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onTapEnd(event) {
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if (event.touches === undefined) {
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return;
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}
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let now = Date.now();
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if (this.touch.start.x !== -1 && now - this.touch.time <= 200) {
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let innerWidthHalf = window.innerWidth / 2;
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if (this.touch.start.x >= innerWidthHalf && event.changedTouches[0].clientX >= innerWidthHalf) {
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goToPage("next");
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} else if (this.touch.start.x < innerWidthHalf && event.changedTouches[0].clientX < innerWidthHalf) {
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goToPage("previous");
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}
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this.reset();
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} else {
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this.reset();
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this.touch.start.x = event.changedTouches[0].clientX;
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this.touch.time = now;
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}
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}
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listen() {
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let hasPassiveOption = DomHelper.hasPassiveEventListenerOption();
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let elements = document.querySelectorAll(".entry-swipe");
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elements.forEach((element) => {
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element.addEventListener("touchstart", (e) => this.onItemTouchStart(e), hasPassiveOption ? { passive: true } : false);
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element.addEventListener("touchmove", (e) => this.onItemTouchMove(e), hasPassiveOption ? { passive: false } : false);
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element.addEventListener("touchend", (e) => this.onItemTouchEnd(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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let element = document.querySelector(".entry-content");
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if (element) {
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if (element.classList.contains("gesture-nav-tap")) {
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element.addEventListener("touchend", (e) => this.onTapEnd(e), hasPassiveOption ? { passive: true } : false);
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element.addEventListener("touchmove", () => this.reset(), hasPassiveOption ? { passive: true } : false);
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element.addEventListener("touchcancel", () => this.reset(), hasPassiveOption ? { passive: true } : false);
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} else if (element.classList.contains("gesture-nav-swipe")) {
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element.addEventListener("touchstart", (e) => this.onContentTouchStart(e), hasPassiveOption ? { passive: true } : false);
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element.addEventListener("touchmove", (e) => this.onContentTouchMove(e), hasPassiveOption ? { passive: true } : false);
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element.addEventListener("touchend", (e) => this.onContentTouchEnd(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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}
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