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Merge pull request #4912 from matrix-org/bwindels/bettersticky

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Add wrapper to room list so sticky headers don't need a background
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Bruno Windels 2020-07-08 13:34:01 +00:00 • committed by GitHub
commit 989e4a9ceb
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4 changed files with 61 additions and 17 deletions
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53
src/components/structures/LeftPanel2.tsx
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@ -21,6 +21,7 @@ import classNames from "classnames";
import dis from "../../dispatcher/dispatcher";
import { _t } from "../../languageHandler";
import RoomList2 from "../views/rooms/RoomList2";
import { HEADER_HEIGHT } from "../views/rooms/RoomSublist2";
import { Action } from "../../dispatcher/actions";
import UserMenu from "./UserMenu";
import RoomSearch from "./RoomSearch";
@ -135,7 +136,6 @@ export default class LeftPanel2 extends React.Component<IProps, IState> {
const bottom = rlRect.bottom;
const top = rlRect.top;
const sublists = list.querySelectorAll<HTMLDivElement>(".mx_RoomSublist2");
const headerHeight = 32; // Note: must match the CSS!
const headerRightMargin = 24; // calculated from margins and widths to align with non-sticky tiles
const headerStickyWidth = rlRect.width - headerRightMargin;
@ -148,17 +148,22 @@ export default class LeftPanel2 extends React.Component<IProps, IState> {
const header = sublist.querySelector<HTMLDivElement>(".mx_RoomSublist2_stickable");
header.style.removeProperty("display"); // always clear display:none first
if (slRect.top + headerHeight > bottom && !gotBottom) {
if (slRect.top + HEADER_HEIGHT > bottom && !gotBottom) {
header.classList.add("mx_RoomSublist2_headerContainer_sticky");
header.classList.add("mx_RoomSublist2_headerContainer_stickyBottom");
header.style.width = `${headerStickyWidth}px`;
header.style.removeProperty("top");
gotBottom = true;
} else if ((slRect.top - (headerHeight / 3)) < top) {
} else if (((slRect.top - (HEADER_HEIGHT * 0.6) + HEADER_HEIGHT) < top) || sublist === sublists[0]) {
// the header should become sticky once it is 60% or less out of view at the top.
// We also add HEADER_HEIGHT because the sticky header is put above the scrollable area,
// into the padding of .mx_LeftPanel2_roomListWrapper,
// by subtracting HEADER_HEIGHT from the top below.
// We also always try to make the first sublist header sticky.
header.classList.add("mx_RoomSublist2_headerContainer_sticky");
header.classList.add("mx_RoomSublist2_headerContainer_stickyTop");
header.style.width = `${headerStickyWidth}px`;
header.style.top = `${rlRect.top}px`;
header.style.top = `${rlRect.top - HEADER_HEIGHT}px`;
if (lastTopHeader) {
lastTopHeader.style.display = "none";
}
@ -171,6 +176,26 @@ export default class LeftPanel2 extends React.Component<IProps, IState> {
header.style.removeProperty("top");
}
}
// add appropriate sticky classes to wrapper so it has
// the necessary top/bottom padding to put the sticky header in
const listWrapper = list.parentElement;
if (gotBottom) {
listWrapper.classList.add("stickyBottom");
} else {
listWrapper.classList.remove("stickyBottom");
}
if (lastTopHeader) {
listWrapper.classList.add("stickyTop");
} else {
listWrapper.classList.remove("stickyTop");
}
// ensure scroll doesn't go above the gap left by the header of
// the first sublist always being sticky if no other header is sticky
if (list.scrollTop < HEADER_HEIGHT) {
list.scrollTop = HEADER_HEIGHT;
}
}
// TODO: Improve header reliability: https://github.com/vector-im/riot-web/issues/14232
@ -324,15 +349,17 @@ export default class LeftPanel2 extends React.Component<IProps, IState> {
<aside className="mx_LeftPanel2_roomListContainer">
{this.renderHeader()}
{this.renderSearchExplore()}
<div
className={roomListClasses}
onScroll={this.onScroll}
ref={this.listContainerRef}
// Firefox sometimes makes this element focusable due to
// overflow:scroll;, so force it out of tab order.
tabIndex={-1}
>
{roomList}
<div className="mx_LeftPanel2_roomListWrapper">
<div
className={roomListClasses}
onScroll={this.onScroll}
ref={this.listContainerRef}
// Firefox sometimes makes this element focusable due to
// overflow:scroll;, so force it out of tab order.
tabIndex={-1}
>
{roomList}
</div>
</div>
</aside>
</div>