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e67d9c6d4f
the overflow/underflow events are not always reliable in nooverlay browsers (FF), so forward the checkOverflow call we need anyway for the scroll indicator gradients to see if we need to do the margin trick for the on-hover scrollbar we use in nooverlay browsers. this fixes on hover jumping in a subroomlist
74 lines
2.5 KiB
JavaScript
74 lines
2.5 KiB
JavaScript
/*
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Copyright 2018 New Vector Ltd
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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import React from "react";
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import AutoHideScrollbar from "./AutoHideScrollbar";
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export default class IndicatorScrollbar extends React.Component {
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constructor(props) {
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super(props);
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this._collectScroller = this._collectScroller.bind(this);
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this._collectScrollerComponent = this._collectScrollerComponent.bind(this);
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this.checkOverflow = this.checkOverflow.bind(this);
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this._scrollElement = null;
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this._autoHideScrollbar = null;
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}
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_collectScroller(scroller) {
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if (scroller && !this._scrollElement) {
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this._scrollElement = scroller;
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this._scrollElement.addEventListener("scroll", this.checkOverflow);
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this.checkOverflow();
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}
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}
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_collectScrollerComponent(autoHideScrollbar) {
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this._autoHideScrollbar = autoHideScrollbar;
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}
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checkOverflow() {
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const hasTopOverflow = this._scrollElement.scrollTop > 0;
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const hasBottomOverflow = this._scrollElement.scrollHeight >
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(this._scrollElement.scrollTop + this._scrollElement.clientHeight);
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if (hasTopOverflow) {
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this._scrollElement.classList.add("mx_IndicatorScrollbar_topOverflow");
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} else {
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this._scrollElement.classList.remove("mx_IndicatorScrollbar_topOverflow");
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}
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if (hasBottomOverflow) {
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this._scrollElement.classList.add("mx_IndicatorScrollbar_bottomOverflow");
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} else {
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this._scrollElement.classList.remove("mx_IndicatorScrollbar_bottomOverflow");
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}
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if (this._autoHideScrollbar) {
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this._autoHideScrollbar.checkOverflow();
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}
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}
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componentWillUnmount() {
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if (this._scrollElement) {
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this._scrollElement.removeEventListener("scroll", this.checkOverflow);
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}
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}
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render() {
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return (<AutoHideScrollbar ref={this._collectScrollerComponent} wrappedRef={this._collectScroller} {... this.props}>
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{ this.props.children }
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</AutoHideScrollbar>);
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}
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}
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