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class TouchHandler {
constructor() {
this.reset();
}
reset() {
this.touch = {
start: { x: -1, y: -1 },
move: { x: -1, y: -1 },
moved: false,
time: 0,
element: null
};
}
calculateDistance() {
if (this.touch.start.x >= -1 && this.touch.move.x >= -1) {
let horizontalDistance = Math.abs(this.touch.move.x - this.touch.start.x);
let verticalDistance = Math.abs(this.touch.move.y - this.touch.start.y);
if (horizontalDistance > 30 && verticalDistance < 70 || this.touch.moved) {
return this.touch.move.x - this.touch.start.x;
}
}
return 0;
}
findElement(element) {
if (element.classList.contains("entry-swipe")) {
return element;
}
return DomHelper.findParent(element, "entry-swipe");
}
onItemTouchStart(event) {
if (event.touches === undefined || event.touches.length !== 1) {
return;
}
this.reset();
this.touch.start.x = event.touches[0].clientX;
this.touch.start.y = event.touches[0].clientY;
this.touch.element = this.findElement(event.touches[0].target);
this.touch.element.style.transitionDuration = "0s";
}
onItemTouchMove(event) {
if (event.touches === undefined || event.touches.length !== 1 || this.element === null) {
return;
}
this.touch.move.x = event.touches[0].clientX;
this.touch.move.y = event.touches[0].clientY;
let distance = this.calculateDistance();
let absDistance = Math.abs(distance);
if (absDistance > 0) {
this.touch.moved = true;
let tx = absDistance > 75 ? Math.pow(absDistance - 75, 0.5) + 75 : absDistance;
if (distance < 0) {
tx = -tx;
}
this.touch.element.style.transform = "translateX(" + tx + "px)";
event.preventDefault();
}
}
onItemTouchEnd(event) {
if (event.touches === undefined) {
return;
}
if (this.touch.element !== null) {
let absDistance = Math.abs(this.calculateDistance());
if (absDistance > 75) {
toggleEntryStatus(this.touch.element);
}
if (this.touch.moved) {
this.touch.element.style.transitionDuration = "0.15s";
this.touch.element.style.transform = "none";
}
}
this.reset();
}
onContentTouchStart(event) {
if (event.touches === undefined || event.touches.length !== 1) {
return;
}
this.reset();
this.touch.start.x = event.touches[0].clientX;
this.touch.start.y = event.touches[0].clientY;
this.touch.time = Date.now();
}
onContentTouchMove(event) {
if (event.touches === undefined || event.touches.length !== 1 || this.element === null) {
return;
}
this.touch.move.x = event.touches[0].clientX;
this.touch.move.y = event.touches[0].clientY;
}
onContentTouchEnd(event) {
if (event.touches === undefined) {
return;
}
let distance = this.calculateDistance();
let absDistance = Math.abs(distance);
let now = Date.now();
if (now - this.touch.time <= 1000 && absDistance > 75) {
if (distance > 0) {
goToPage("previous");
} else {
goToPage("next");
}
}
this.reset();
}
onTapEnd(event) {
if (event.touches === undefined) {
return;
}
let now = Date.now();
if (this.touch.start.x !== -1 && now - this.touch.time <= 200) {
let innerWidthHalf = window.innerWidth / 2;
if (this.touch.start.x >= innerWidthHalf && event.changedTouches[0].clientX >= innerWidthHalf) {
goToPage("next");
} else if (this.touch.start.x < innerWidthHalf && event.changedTouches[0].clientX < innerWidthHalf) {
goToPage("previous");
}
this.reset();
} else {
this.reset();
this.touch.start.x = event.changedTouches[0].clientX;
this.touch.time = now;
}
}
listen() {
let hasPassiveOption = DomHelper.hasPassiveEventListenerOption();
let elements = document.querySelectorAll(".entry-swipe");
elements.forEach((element) => {
element.addEventListener("touchstart", (e) => this.onItemTouchStart(e), hasPassiveOption ? { passive: true } : false);
element.addEventListener("touchmove", (e) => this.onItemTouchMove(e), hasPassiveOption ? { passive: true } : false);
element.addEventListener("touchend", (e) => this.onItemTouchEnd(e), hasPassiveOption ? { passive: true } : false);
element.addEventListener("touchcancel", () => this.reset(), hasPassiveOption ? { passive: true } : false);
});
let element = document.querySelector(".entry-content");
if (element) {
if (element.classList.contains("gesture-nav-tap")) {
element.addEventListener("touchend", (e) => this.onTapEnd(e), hasPassiveOption ? { passive: true } : false);
element.addEventListener("touchmove", () => this.reset(), hasPassiveOption ? { passive: true } : false);
element.addEventListener("touchcancel", () => this.reset(), hasPassiveOption ? { passive: true } : false);
} else if (element.classList.contains("gesture-nav-swipe")) {
element.addEventListener("touchstart", (e) => this.onContentTouchStart(e), hasPassiveOption ? { passive: true } : false);
element.addEventListener("touchmove", (e) => this.onContentTouchMove(e), hasPassiveOption ? { passive: true } : false);
element.addEventListener("touchend", (e) => this.onContentTouchEnd(e), hasPassiveOption ? { passive: true } : false);
element.addEventListener("touchcancel", () => this.reset(), hasPassiveOption ? { passive: true } : false);
}
}
}
}
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