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Diffstat (limited to 'ext/mixed/js/scroll.js')
-rw-r--r-- | ext/mixed/js/scroll.js | 110 |
1 files changed, 0 insertions, 110 deletions
diff --git a/ext/mixed/js/scroll.js b/ext/mixed/js/scroll.js deleted file mode 100644 index 33577795..00000000 --- a/ext/mixed/js/scroll.js +++ /dev/null @@ -1,110 +0,0 @@ -/* - * Copyright (C) 2019-2021 Yomichan Authors - * - * This program is free software: you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation, either version 3 of the License, or - * (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program. If not, see <https://www.gnu.org/licenses/>. - */ - -class WindowScroll { - constructor(node) { - this._node = node; - this._animationRequestId = null; - this._animationStartTime = 0; - this._animationStartX = 0; - this._animationStartY = 0; - this._animationEndTime = 0; - this._animationEndX = 0; - this._animationEndY = 0; - this._requestAnimationFrameCallback = this._onAnimationFrame.bind(this); - } - - get x() { - return this._node !== null ? this._node.scrollLeft : window.scrollX || window.pageXOffset; - } - - get y() { - return this._node !== null ? this._node.scrollTop : window.scrollY || window.pageYOffset; - } - - toY(y) { - this.to(this.x, y); - } - - toX(x) { - this.to(x, this.y); - } - - to(x, y) { - this.stop(); - this._scroll(x, y); - } - - animate(x, y, time) { - this._animationStartX = this.x; - this._animationStartY = this.y; - this._animationStartTime = window.performance.now(); - this._animationEndX = x; - this._animationEndY = y; - this._animationEndTime = this._animationStartTime + time; - this._animationRequestId = window.requestAnimationFrame(this._requestAnimationFrameCallback); - } - - stop() { - if (this._animationRequestId === null) { - return; - } - - window.cancelAnimationFrame(this._animationRequestId); - this._animationRequestId = null; - } - - // Private - - _onAnimationFrame(time) { - if (time >= this._animationEndTime) { - this._scroll(this._animationEndX, this._animationEndY); - this._animationRequestId = null; - return; - } - - const t = this._easeInOutCubic((time - this._animationStartTime) / (this._animationEndTime - this._animationStartTime)); - this._scroll( - this._lerp(this._animationStartX, this._animationEndX, t), - this._lerp(this._animationStartY, this._animationEndY, t) - ); - - this._animationRequestId = window.requestAnimationFrame(this._requestAnimationFrameCallback); - } - - _easeInOutCubic(t) { - if (t < 0.5) { - return (4.0 * t * t * t); - } else { - t = 1.0 - t; - return 1.0 - (4.0 * t * t * t); - } - } - - _lerp(start, end, percent) { - return (end - start) * percent + start; - } - - _scroll(x, y) { - if (this._node !== null) { - this._node.scrollLeft = x; - this._node.scrollTop = y; - } else { - window.scroll(x, y); - } - } -} |