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use transparent scrollbars on not hover to emulate scrolbar on hover

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allows us to get rid of the margin-right hack as well
This commit is contained in:
Bruno Windels 2020-03-25 19:24:32 +01:00
parent 44ce5b5764
commit 0436507574
2 changed files with 21 additions and 114 deletions
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57
src/components/structures/AutoHideScrollbar.js
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@ -18,7 +18,7 @@ import React from "react";
// derived from code from github.com/noeldelgado/gemini-scrollbar
// Copyright (c) Noel Delgado <pixelia.me@gmail.com> (pixelia.me)
function getScrollbarWidth(alternativeOverflow) {
function getScrollbarWidth() {
const div = document.createElement('div');
div.className = 'mx_AutoHideScrollbar'; //to get width of css scrollbar
div.style.position = 'absolute';
@ -26,9 +26,6 @@ function getScrollbarWidth(alternativeOverflow) {
div.style.width = '100px';
div.style.height = '100px';
div.style.overflow = "scroll";
if (alternativeOverflow) {
div.style.overflow = alternativeOverflow;
}
div.style.msOverflowStyle = '-ms-autohiding-scrollbar';
document.body.appendChild(div);
const scrollbarWidth = (div.offsetWidth - div.clientWidth);
@ -39,18 +36,7 @@ function getScrollbarWidth(alternativeOverflow) {
function install() {
const scrollbarWidth = getScrollbarWidth();
if (scrollbarWidth !== 0) {
const hasForcedOverlayScrollbar = getScrollbarWidth('overlay') === 0;
// overflow: overlay on webkit doesn't auto hide the scrollbar
if (hasForcedOverlayScrollbar) {
document.body.classList.add("mx_scrollbar_overlay_noautohide");
} else {
document.body.classList.add("mx_scrollbar_nooverlay");
const style = document.createElement('style');
style.type = 'text/css';
style.innerText =
`body.mx_scrollbar_nooverlay { --scrollbar-width: ${scrollbarWidth}px; }`;
document.head.appendChild(style);
}
document.body.classList.add("mx_scrollbar_noautohide");
}
}
@ -67,42 +53,7 @@ const installBodyClassesIfNeeded = (function() {
export default class AutoHideScrollbar extends React.Component {
constructor(props) {
super(props);
this.onOverflow = this.onOverflow.bind(this);
this.onUnderflow = this.onUnderflow.bind(this);
this._collectContainerRef = this._collectContainerRef.bind(this);
this._needsOverflowListener = null;
}
onOverflow() {
this.containerRef.classList.add("mx_AutoHideScrollbar_overflow");
this.containerRef.classList.remove("mx_AutoHideScrollbar_underflow");
}
onUnderflow() {
this.containerRef.classList.remove("mx_AutoHideScrollbar_overflow");
this.containerRef.classList.add("mx_AutoHideScrollbar_underflow");
}
checkOverflow() {
if (!this._needsOverflowListener) {
return;
}
if (this.containerRef.scrollHeight > this.containerRef.clientHeight) {
this.onOverflow();
} else {
this.onUnderflow();
}
}
componentDidUpdate() {
this.checkOverflow();
}
componentDidMount() {
installBodyClassesIfNeeded();
this._needsOverflowListener =
document.body.classList.contains("mx_scrollbar_nooverlay");
this.checkOverflow();
}
_collectContainerRef(ref) {
@ -126,9 +77,7 @@ export default class AutoHideScrollbar extends React.Component {
onScroll={this.props.onScroll}
onWheel={this.props.onWheel}
>
<div className="mx_AutoHideScrollbar_offset">
{ this.props.children }
</div>
{ this.props.children }
</div>);
}
}