LeftPane: Measure content above list to calculate list size

stylesheets/_modules.scss

@@ -5206,8 +5206,8 @@ button.module-image__border-overlay:focus {
 }
 
 .module-left-pane__header {
-  flex-shrink: 0;
   flex-grow: 0;
+  flex-shrink: 0;
 }
 
 .module-left-pane__archive-header {
@@ -5295,13 +5295,20 @@ button.module-image__border-overlay:focus {
   }
 }
 
-.module-left-pane__list {
+.module-left-pane__list--measure {
   flex-grow: 1;
   flex-shrink: 1;
-
   outline: none;
 }
 
+.module-left-pane__list--wrapper {
+  position: relative;
+}
+
+.module-left-pane__list {
+  position: absolute;
+}
+
 .module-left-pane__virtual-list {
   outline: none;
 }

ts/components/LeftPane.tsx

@@ -56,12 +56,6 @@ export class LeftPane extends React.Component<PropsType> {
   public containerRef = React.createRef<HTMLDivElement>();
   public setFocusToFirstNeeded = false;
   public setFocusToLastNeeded = false;
-  public state = {
-    dimensions: {
-      height: 0,
-      width: 0,
-    },
-  };
 
   public renderRow = ({
     index,
@@ -165,10 +159,6 @@ export class LeftPane extends React.Component<PropsType> {
     }
   };
 
-  public handleResize = ({ bounds }: { bounds: BoundingRect }) => {
-    this.setState({ dimensions: bounds });
-  };
-
   public handleFocus = () => {
     const { selectedConversationId } = this.props;
     const { current: container } = this.containerRef;
@@ -295,7 +285,10 @@ export class LeftPane extends React.Component<PropsType> {
       : conversations.length + (archivedConversations.length ? 1 : 0);
   };
 
-  public renderList = (): JSX.Element | Array<JSX.Element | null> => {
+  public renderList = ({
+    height,
+    width,
+  }: BoundingRect): JSX.Element | Array<JSX.Element | null> => {
     const {
       archivedConversations,
       i18n,
@@ -311,6 +304,8 @@ export class LeftPane extends React.Component<PropsType> {
       return (
         <SearchResults
           {...searchResults}
+          height={height || 0}
+          width={width || 0}
           openConversationInternal={openConversationInternal}
           startNewConversation={startNewConversation}
           renderMessageSearchResult={renderMessageSearchResult}
@@ -327,24 +322,16 @@ export class LeftPane extends React.Component<PropsType> {
 
     const length = this.getLength();
 
-    const archived = showArchived ? (
-      <div className="module-left-pane__archive-helper-text" key={0}>
-        {i18n('archiveHelperText')}
-      </div>
-    ) : null;
-
     // We ensure that the listKey differs between inbox and archive views, which ensures
     //   that AutoSizer properly detects the new size of its slot in the flexbox. The
     //   archive explainer text at the top of the archive view causes problems otherwise.
     //   It also ensures that we scroll to the top when switching views.
     const listKey = showArchived ? 1 : 0;
 
-    const { height, width } = this.state.dimensions;
-
     // Note: conversations is not a known prop for List, but it is required to ensure that
     //   it re-renders when our conversation data changes. Otherwise it would just render
     //   on startup and scroll.
-    const list = (
+    return (
       <div
         aria-live="polite"
         className="module-left-pane__list"
@@ -358,19 +345,17 @@ export class LeftPane extends React.Component<PropsType> {
         <List
           className="module-left-pane__virtual-list"
           conversations={conversations}
-          height={height}
+          height={height || 0}
           onScroll={this.onScroll}
           ref={this.listRef}
           rowCount={length}
           rowHeight={68}
           rowRenderer={this.renderRow}
           tabIndex={-1}
-          width={width}
+          width={width || 0}
         />
       </div>
     );
-
-    return [archived, list];
   };
 
   public renderArchivedHeader = (): JSX.Element => {
@@ -392,6 +377,7 @@ export class LeftPane extends React.Component<PropsType> {
 
   public render(): JSX.Element {
     const {
+      i18n,
       renderExpiredBuildDialog,
       renderMainHeader,
       renderNetworkStatus,
@@ -400,21 +386,31 @@ export class LeftPane extends React.Component<PropsType> {
       showArchived,
     } = this.props;
 
+    /* tslint:disable no-non-null-assertion */
     return (
-      <Measure bounds={true} onResize={this.handleResize}>
-        {({ measureRef }: MeasuredComponentProps) => (
-          <div className="module-left-pane" ref={measureRef}>
-            <div className="module-left-pane__header">
-              {showArchived ? this.renderArchivedHeader() : renderMainHeader()}
-            </div>
-            {renderExpiredBuildDialog()}
-            {renderNetworkStatus()}
-            {renderUpdateDialog()}
-            {renderRelinkDialog()}
-            {this.renderList()}
+      <div className="module-left-pane">
+        <div className="module-left-pane__header">
+          {showArchived ? this.renderArchivedHeader() : renderMainHeader()}
+        </div>
+        {renderExpiredBuildDialog()}
+        {renderNetworkStatus()}
+        {renderUpdateDialog()}
+        {renderRelinkDialog()}
+        {showArchived && (
+          <div className="module-left-pane__archive-helper-text" key={0}>
+            {i18n('archiveHelperText')}
           </div>
         )}
-      </Measure>
+        <Measure bounds={true}>
+          {({ contentRect, measureRef }: MeasuredComponentProps) => (
+            <div className="module-left-pane__list--measure" ref={measureRef}>
+              <div className="module-left-pane__list--wrapper">
+                {this.renderList(contentRect.bounds!)}
+              </div>
+            </div>
+          )}
+        </Measure>
+      </div>
     );
   }
 }

ts/components/SearchResults.stories.tsx

@@ -111,6 +111,7 @@ messageLookup.set('4-guid-guid-guid-guid-guid', {
 
 const defaultProps = {
   discussionsLoading: false,
+  height: 700,
   items: [],
   i18n,
   messagesLoading: false,
@@ -135,6 +136,7 @@ const defaultProps = {
   selectedConversationId: undefined,
   selectedMessageId: undefined,
   startNewConversation: action('start-new-conversation'),
+  width: 320,
 };
 
 const conversations = [

ts/components/SearchResults.tsx

@@ -1,10 +1,5 @@
 import React from 'react';
-import {
-  AutoSizer,
-  CellMeasurer,
-  CellMeasurerCache,
-  List,
-} from 'react-virtualized';
+import { CellMeasurer, CellMeasurerCache, List } from 'react-virtualized';
 import { debounce, get, isNumber } from 'lodash';
 
 import { Intl } from './Intl';
@@ -86,6 +81,8 @@ type PropsHousekeepingType = {
     query: string,
     options: { regionCode: string }
   ) => void;
+  height: number;
+  width: number;
 
   renderMessageSearchResult: (id: string) => JSX.Element;
 };
@@ -121,8 +118,6 @@ type OnScrollParamsType = {
 export class SearchResults extends React.Component<PropsType, StateType> {
   public setFocusToFirstNeeded = false;
   public setFocusToLastNeeded = false;
-  public mostRecentWidth = 0;
-  public mostRecentHeight = 0;
   public cellSizeCache = new CellMeasurerCache({
     defaultHeight: 80,
     fixedWidth: true,
@@ -454,7 +449,7 @@ export class SearchResults extends React.Component<PropsType, StateType> {
     parent,
     style,
   }: RowRendererParamsType): JSX.Element => {
-    const { items } = this.props;
+    const { items, width } = this.props;
 
     const row = items[index];
 
@@ -466,7 +461,7 @@ export class SearchResults extends React.Component<PropsType, StateType> {
           key={key}
           parent={parent}
           rowIndex={index}
-          width={this.mostRecentWidth}
+          width={width}
         >
           {this.renderRowContents(row)}
         </CellMeasurer>
@@ -530,11 +525,13 @@ export class SearchResults extends React.Component<PropsType, StateType> {
 
   public render() {
     const {
+      height,
       i18n,
       items,
       noResults,
       searchConversationName,
       searchTerm,
+      width,
     } = this.props;
     const { scrollToIndex } = this.state;
 
@@ -581,30 +578,21 @@ export class SearchResults extends React.Component<PropsType, StateType> {
         onKeyDown={this.handleKeyDown}
         onFocus={this.handleFocus}
       >
-        <AutoSizer>
-          {({ height, width }) => {
-            this.mostRecentWidth = width;
-            this.mostRecentHeight = height;
-
-            return (
-              <List
-                className="module-search-results__virtual-list"
-                deferredMeasurementCache={this.cellSizeCache}
-                height={height}
-                items={items}
-                overscanRowCount={5}
-                ref={this.listRef}
-                rowCount={this.getRowCount()}
-                rowHeight={this.cellSizeCache.rowHeight}
-                rowRenderer={this.renderRow}
-                scrollToIndex={scrollToIndex}
-                tabIndex={-1}
-                onScroll={this.onScroll as any}
-                width={width}
-              />
-            );
-          }}
-        </AutoSizer>
+        <List
+          className="module-search-results__virtual-list"
+          deferredMeasurementCache={this.cellSizeCache}
+          height={height}
+          items={items}
+          overscanRowCount={5}
+          ref={this.listRef}
+          rowCount={this.getRowCount()}
+          rowHeight={this.cellSizeCache.rowHeight}
+          rowRenderer={this.renderRow}
+          scrollToIndex={scrollToIndex}
+          tabIndex={-1}
+          onScroll={this.onScroll as any}
+          width={width}
+        />
       </div>
     );
   }

ts/util/lint/exceptions.json

@@ -11522,7 +11522,7 @@
     "rule": "React-createRef",
     "path": "ts/components/SearchResults.js",
     "line": "        this.listRef = react_1.default.createRef();",
-    "lineNumber": 26,
+    "lineNumber": 24,
     "reasonCategory": "usageTrusted",
     "updated": "2019-08-09T00:44:31.008Z",
     "reasonDetail": "SearchResults needs to interact with its child List directly"