mirror of
https://github.com/the1812/Bilibili-Evolved.git
synced 2025-11-04 21:22:45 +08:00
247 lines
7.9 KiB
JavaScript
247 lines
7.9 KiB
JavaScript
const getPosition = element =>
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{
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let x = 0;
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let y = 0;
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while (element && !isNaN(element.offsetLeft) && !isNaN(element.offsetTop))
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{
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x += element.offsetLeft - element.scrollLeft;
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y += element.offsetTop - element.scrollTop;
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element = element.offsetParent;
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}
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return { x: x, y: y };
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};
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class Swiper
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{
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constructor(element)
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{
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this.action = new SwipeAction(element);
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this.onTouchStart = undefined;
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this.onTouchEnd = undefined;
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this._direction = null;
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element.addEventListener("touchstart", e =>
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{
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this._xDown = e.touches[0].clientX;
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this._yDown = e.touches[0].clientY;
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if (this.onTouchStart)
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{
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this.onTouchStart(e);
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}
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});
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element.addEventListener("touchmove", e =>
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{
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if (!this._xDown || !this._yDown)
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{
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return;
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}
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const xUp = e.touches[0].clientX;
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const yUp = e.touches[0].clientY;
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const elementPosition = getPosition(element);
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const position = {
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x: (e.touches[0].pageX - elementPosition.x) / element.clientWidth,
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y: (e.touches[0].pageY - elementPosition.y) / element.clientHeight,
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width: element.clientWidth,
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height: element.clientHeight
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};
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const xDiff = this._xDown - xUp;
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const yDiff = this._yDown - yUp;
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if (!this._direction)
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{
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let direction = "";
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if (Math.abs(xDiff) > Math.abs(yDiff))
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{
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direction = "horizontal";
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}
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else
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{
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direction = "vertical";
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}
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this._direction = direction;
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e.preventDefault();
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}
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else
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{
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if (this._direction === "vertical")
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{
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this.action.startAction(this._direction, yDiff, position);
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}
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else if (this._direction === "horizontal")
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{
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this.action.startAction(this._direction, -xDiff, position);
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}
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e.preventDefault();
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}
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});
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element.addEventListener("touchend", e =>
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{
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this._xDown = null;
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this._yDown = null;
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this._direction = null;
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if (this.onTouchEnd)
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{
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this.onTouchEnd(e);
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}
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});
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}
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}
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class SwipeAction
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{
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constructor(element)
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{
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this.lowSpeedForward = undefined;
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this.lowSpeedBackward = undefined;
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this.mediumSpeedForward = undefined;
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this.mediumSpeedBackward = undefined;
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this.highSpeedForward = undefined;
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this.highSpeedBackward = undefined;
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this.lowVolumeUp = undefined;
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this.lowVolumeDown = undefined;
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this.mediumVolumeUp = undefined;
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this.mediumVolumeDown = undefined;
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this.highVolumeUp = undefined;
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this.highVolumeDown = undefined;
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this.speedCancel = undefined;
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this.volumeCancel = undefined;
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this.minSwipeDistance = 20;
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this.onActionStart = undefined;
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this.onActionEnd = undefined;
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this._element = element;
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this._touchStart = false;
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this._startPosition = null;
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this._lastAction = null;
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element.addEventListener("touchstart", () =>
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{
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this._touchStart = true;
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});
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element.addEventListener("touchend", () =>
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{
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this._startPosition = null;
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this.onActionEnd && this.onActionEnd(this._lastAction);
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this._lastAction = null;
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});
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}
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startAction(direction, distance, position)
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{
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if (this._touchStart)
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{
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this.onActionStart && this.onActionStart();
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this._startPosition = position;
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this._touchStart = false;
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}
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if (direction === "vertical")
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{
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if (Math.abs(distance) < this.minSwipeDistance)
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{
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this.volumeCancel && this.volumeCancel();
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this._lastAction = null;
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}
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else
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{
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let volumeFactor = 0;
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let upHandler = undefined;
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let downHandler = undefined;
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if (this._startPosition.x < 1 / 3)
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{
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volumeFactor = 0.4;
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upHandler = this.lowVolumeUp;
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downHandler = this.lowVolumeDown;
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}
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else if (this._startPosition.x >= 1 / 3 && this._startPosition.x <= 2 / 3)
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{
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volumeFactor = 1;
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upHandler = this.mediumVolumeUp;
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downHandler = this.mediumVolumeDown;
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}
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else
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{
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volumeFactor = 2;
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upHandler = this.highVolumeUp;
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downHandler = this.highVolumeDown;
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}
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if (distance > 0)
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{
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const volumeChange = Math.round(
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volumeFactor * 100 * (distance - this.minSwipeDistance) / (1.5 * position.height)
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);
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upHandler && upHandler(volumeChange);
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this._lastAction = {
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type: "volume",
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volume: volumeChange
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};
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}
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else
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{
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const volumeChange = Math.round(
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volumeFactor * 100 * (distance + this.minSwipeDistance) / (1.5 * position.height)
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);
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downHandler && downHandler(volumeChange);
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this._lastAction = {
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type: "volume",
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volume: volumeChange
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};
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}
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}
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}
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else if (direction === "horizontal")
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{
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if (position.y < 1 / 3 && (position.x < 0.1 || position.x > 0.9) ||
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Math.abs(distance) < this.minSwipeDistance)
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{
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this.speedCancel && this.speedCancel();
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this._lastAction = null;
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}
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else
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{
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let speedFactor = 0;
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let forwardHandler = undefined;
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let backwardHandler = undefined;
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if (this._startPosition.y < 1 / 3)
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{
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speedFactor = 0.05;
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forwardHandler = this.lowSpeedForward;
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backwardHandler = this.lowSpeedBackward;
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}
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else if (this._startPosition.y >= 1 / 3 && this._startPosition.y <= 2 / 3)
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{
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speedFactor = 0.2;
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forwardHandler = this.mediumSpeedForward;
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backwardHandler = this.mediumSpeedBackward;
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}
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else
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{
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speedFactor = 1;
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forwardHandler = this.highSpeedForward;
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backwardHandler = this.highSpeedBackward;
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}
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if (distance > 0)
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{
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const seconds = (distance - this.minSwipeDistance) * speedFactor;
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forwardHandler && forwardHandler(seconds);
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this._lastAction = {
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type: "playback",
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seconds: seconds
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};
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}
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else
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{
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const seconds = (distance + this.minSwipeDistance) * speedFactor;
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backwardHandler && backwardHandler(seconds);
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this._lastAction = {
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type: "playback",
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seconds: seconds
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};
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}
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}
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}
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}
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}
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