diff options
| -rw-r--r-- | ext/bg/search.html | 1 | ||||
| -rw-r--r-- | ext/fg/float.html | 1 | ||||
| -rw-r--r-- | ext/mixed/js/display.js | 14 | ||||
| -rw-r--r-- | ext/mixed/js/scroll.js | 100 |
4 files changed, 111 insertions, 5 deletions
diff --git a/ext/bg/search.html b/ext/bg/search.html index 3c78122d..ab208c26 100644 --- a/ext/bg/search.html +++ b/ext/bg/search.html @@ -47,6 +47,7 @@ <script src="/fg/js/source.js"></script> <script src="/mixed/js/display.js"></script> <script src="/mixed/js/japanese.js"></script> + <script src="/mixed/js/scroll.js"></script> <script src="/bg/js/search.js"></script> <script src="/bg/js/search-frontend.js"></script> diff --git a/ext/fg/float.html b/ext/fg/float.html index 465db589..e86c2caa 100644 --- a/ext/fg/float.html +++ b/ext/fg/float.html @@ -41,6 +41,7 @@ <script src="/fg/js/document.js"></script> <script src="/fg/js/source.js"></script> <script src="/mixed/js/display.js"></script> + <script src="/mixed/js/scroll.js"></script> <script src="/fg/js/float.js"></script> diff --git a/ext/mixed/js/display.js b/ext/mixed/js/display.js index a3d618e5..e3c44507 100644 --- a/ext/mixed/js/display.js +++ b/ext/mixed/js/display.js @@ -31,6 +31,8 @@ class Display { this.dependencies = {}; + this.windowScroll = new WindowScroll(); + document.addEventListener('keydown', this.onKeyDown.bind(this)); document.addEventListener('wheel', this.onWheel.bind(this), {passive: false}); } @@ -53,11 +55,12 @@ class Display { e.preventDefault(); const link = e.target; + this.windowScroll.toY(0); const context = { source: { definitions: this.definitions, index: this.entryIndexFind(link), - scroll: $('html,body').scrollTop() + scroll: this.windowScroll.y } }; @@ -102,11 +105,12 @@ class Display { textSource.cleanup(); } + this.windowScroll.toY(0); const context = { source: { definitions: this.definitions, index: this.entryIndexFind(clickedElement), - scroll: $('html,body').scrollTop() + scroll: this.windowScroll.y } }; @@ -410,7 +414,7 @@ class Display { $('.current').hide().eq(index).show(); - const container = $('html,body').stop(); + this.windowScroll.stop(); const entry = $('.entry').eq(index); let target; @@ -421,9 +425,9 @@ class Display { } if (smooth) { - container.animate({scrollTop: target}, 200); + this.windowScroll.animate(this.windowScroll.x, target, 200); } else { - container.scrollTop(target); + this.windowScroll.toY(target); } this.index = index; diff --git a/ext/mixed/js/scroll.js b/ext/mixed/js/scroll.js new file mode 100644 index 00000000..824fd92b --- /dev/null +++ b/ext/mixed/js/scroll.js @@ -0,0 +1,100 @@ +/* + * Copyright (C) 2019 Alex Yatskov <alex@foosoft.net> + * Author: Alex Yatskov <alex@foosoft.net> + * + * 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 <http://www.gnu.org/licenses/>. + */ + + +class WindowScroll { + constructor() { + this.animationRequestId = null; + this.animationStartTime = 0; + this.animationStartX = 0; + this.animationStartY = 0; + this.animationEndTime = 0; + this.animationEndX = 0; + this.animationEndY = 0; + this.requestAnimationFrameCallback = (t) => this.onAnimationFrame(t); + } + + toY(y) { + this.to(this.x, y); + } + + toX(x) { + this.to(x, this.y); + } + + to(x, y) { + this.stop(); + window.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; + } + + onAnimationFrame(time) { + if (time >= this.animationEndTime) { + window.scroll(this.animationEndX, this.animationEndY); + this.animationRequestId = null; + return; + } + + const t = WindowScroll.easeInOutCubic((time - this.animationStartTime) / (this.animationEndTime - this.animationStartTime)); + window.scroll( + WindowScroll.lerp(this.animationStartX, this.animationEndX, t), + WindowScroll.lerp(this.animationStartY, this.animationEndY, t) + ); + + this.animationRequestId = window.requestAnimationFrame(this.requestAnimationFrameCallback); + } + + get x() { + return window.scrollX || window.pageXOffset; + } + + get y() { + return window.scrollY || window.pageYOffset; + } + + static 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); + } + } + + static lerp(start, end, percent) { + return (end - start) * percent + start; + } +} |