(server) Multiple Selector on Layout Inspector

Summary:
This diff adds multiple selector UI on layout plugin, which shows up when there are more than one component at a touch.

This UI allows user to do similar thing to element inspector. Expanding functionality on main component will be added in next diffs.

Reviewed By: mweststrate

Differential Revision: D21214899

fbshipit-source-id: 5c9cae93122cc4f7c326ccd0878d2b9dddebf62b

desktop/app/src/ui/components/elements-inspector/elements.tsx

@@ -20,7 +20,7 @@ import styled from '@emotion/styled';
 import {clipboard, MenuItemConstructorOptions} from 'electron';
 import React, {MouseEvent, KeyboardEvent} from 'react';
 
-const ROW_HEIGHT = 23;
+export const ROW_HEIGHT = 23;
 
 const backgroundColor = (props: {
   selected: boolean;

desktop/plugins/layout/Inspector.tsx

@@ -13,11 +13,19 @@ import {
   PluginClient,
   ElementsInspector,
   ElementSearchResultSet,
+  FlexColumn,
+  styled,
 } from 'flipper';
-import {Component} from 'react';
 import {debounce} from 'lodash';
+import {Component} from 'react';
 import {PersistedState, ElementMap} from './';
 import React from 'react';
+import MultipleSelectorSection from './MultipleSelectionSection';
+
+const ElementsInspectorContainer = styled(FlexColumn)({
+  width: '100%',
+  justifyContent: 'space-between',
+});
 
 type GetNodesOptions = {
   force?: boolean;
@@ -25,7 +33,12 @@ type GetNodesOptions = {
   forAccessibilityEvent?: boolean;
 };
 
-type ElementSelectorNode = {[id: string]: ElementSelectorNode};
+export type ElementSelectorNode = {[id: string]: ElementSelectorNode};
+export type ElementSelectorData = {
+  leaves: Array<ElementID>;
+  tree: ElementSelectorNode;
+  elements: ElementMap;
+};
 
 type Props = {
   ax?: boolean;
@@ -41,7 +54,14 @@ type Props = {
   searchResults: ElementSearchResultSet | null;
 };
 
-export default class Inspector extends Component<Props> {
+type State = {
+  elementSelector: ElementSelectorData | null;
+  axElementSelector: ElementSelectorData | null;
+};
+
+export default class Inspector extends Component<Props, State> {
+  state: State = {elementSelector: null, axElementSelector: null};
+
   call() {
     return {
       GET_ROOT: this.props.ax ? 'getAXRoot' : 'getRoot',
@@ -133,12 +153,29 @@ export default class Inspector extends Component<Props> {
 
     this.props.client.subscribe(
       this.call().SELECT,
-      ({path, tree}: {path?: Array<ElementID>; tree?: ElementSelectorNode}) => {
-        if (tree) {
-          this._getAndExpandPathFromTree(tree);
-        } else if (path) {
+      async ({
+        path,
+        tree,
+      }: {
+        path?: Array<ElementID>;
+        tree?: ElementSelectorNode;
+      }) => {
+        if (path) {
           this.getAndExpandPath(path);
         }
+        if (tree) {
+          const leaves = this.getElementLeaves(tree);
+          const elementArray = await this.getNodes(leaves, {});
+          const elements = leaves.reduce(
+            (acc, cur, idx) => ({...acc, [cur]: elementArray[idx]}),
+            {},
+          );
+          if (this.props.ax) {
+            this.setState({axElementSelector: {tree, leaves, elements}});
+          } else {
+            this.setState({elementSelector: {tree, leaves, elements}});
+          }
+        }
       },
     );
 
@@ -373,7 +410,12 @@ export default class Inspector extends Component<Props> {
   };
 
   render() {
+    const selectorData = this.props.ax
+      ? this.state.axElementSelector
+      : this.state.elementSelector;
+
     return this.root() ? (
+      <ElementsInspectorContainer>
         <ElementsInspector
           onElementSelected={this.onElementSelected}
           onElementHovered={this.onElementHovered}
@@ -386,6 +428,15 @@ export default class Inspector extends Component<Props> {
           focused={this.focused()}
           contextMenuExtensions={this.getAXContextMenuExtensions()}
         />
+        {selectorData && selectorData.leaves.length > 1 ? (
+          <MultipleSelectorSection
+            initialSelectedElement={this.selected()}
+            elements={selectorData.elements}
+            onElementSelected={this.onElementSelected}
+            onElementHovered={this.onElementHovered}
+          />
+        ) : null}
+      </ElementsInspectorContainer>
     ) : null;
   }
 }

desktop/plugins/layout/MultipleSelectionSection.tsx

@@ -0,0 +1,84 @@
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @format
+ */
+
+import {
+  FlexColumn,
+  FlexBox,
+  Element,
+  ElementID,
+  ElementsInspector,
+  colors,
+  styled,
+} from 'flipper';
+import React, {memo, useState} from 'react';
+import {ROW_HEIGHT} from '../../app/src/ui/components/elements-inspector/elements';
+
+const MultipleSelectorSectionContainer = styled(FlexColumn)({
+  maxHeight: 3 * ROW_HEIGHT + 24,
+});
+
+const MultipleSelectorSectionTitle = styled(FlexBox)({
+  cursor: 'pointer',
+  backgroundColor: '#f6f7f9',
+  padding: '2px',
+  paddingLeft: '9px',
+  width: '325px',
+  height: '20px',
+  fontWeight: 500,
+  boxShadow: '2px 2px 2px #ccc',
+  border: `1px solid ${colors.light20}`,
+  borderTopLeftRadius: '4px',
+  borderTopRightRadius: '4px',
+  textAlign: 'center',
+});
+
+type MultipleSelectorSectionProps = {
+  initialSelectedElement: ElementID | null | undefined;
+  elements: {[id: string]: Element};
+  onElementSelected: (key: string) => void;
+  onElementHovered:
+    | ((key: string | null | undefined) => any)
+    | null
+    | undefined;
+};
+
+const MultipleSelectorSection: React.FC<MultipleSelectorSectionProps> = memo(
+  (props: MultipleSelectorSectionProps) => {
+    const {
+      initialSelectedElement,
+      elements,
+      onElementSelected,
+      onElementHovered,
+    } = props;
+    const [selectedId, setSelectedId] = useState<ElementID | null | undefined>(
+      initialSelectedElement,
+    );
+    return (
+      <MultipleSelectorSectionContainer>
+        <MultipleSelectorSectionTitle>
+          Multiple elements found at the target coordinates
+        </MultipleSelectorSectionTitle>
+        <ElementsInspector
+          onElementSelected={(key: string) => {
+            setSelectedId(key);
+            onElementSelected(key);
+          }}
+          onElementHovered={onElementHovered}
+          onElementExpanded={() => {}}
+          onValueChanged={null}
+          root={null}
+          selected={selectedId}
+          elements={elements}
+        />
+      </MultipleSelectorSectionContainer>
+    );
+  },
+);
+
+export default MultipleSelectorSection;