Improved interaction between tree and visualizer

Summary:
Improved the 2 way relationship between tree and vizualiser. There are 3 states.
1. Select, this is when you click on either tree node or view. View is highlighted darker colour, sidebar shows up for that node and select is persisted when you mouse away
2. Hover, this is when you hover over a tree node or in the vizualizer, the node is highlighted a lighter colur
3. Hover while holding control - same as hover but we dont draw any children, this lets you see how parent nodes appear without their children

Reviewed By: lblasa

Differential Revision: D39695661

fbshipit-source-id: 623e479fb03567e9f15a4a4f9201b2c7884cabe4

desktop/plugins/public/ui-debugger/components/Tree.tsx

@@ -23,34 +23,36 @@ export function Tree(props: {
   const [antTree, inactive] = nodesToAntTree(props.rootId, props.nodes);
 
   return (
-    <AntTree
+    <div
       onMouseLeave={() => {
-        //when mouse exits the entire tree then unhover
+        //This div exists so when mouse exits the entire tree then unhover
         props.onHoveredNode(undefined);
-      }}
-      showIcon
-      showLine
-      titleRender={(node) => {
-        return (
-          <div
-            onMouseEnter={() => {
-              props.onHoveredNode(node.key as Id);
-            }}>
-            {node.title}
-          </div>
-        );
-      }}
-      selectedKeys={[props.selectedNode ?? '']}
-      onSelect={(selected) => {
-        props.onSelectNode(selected[0] as Id);
-      }}
-      defaultExpandAll
-      expandedKeys={[...props.nodes.keys()].filter(
-        (key) => !inactive.includes(key),
-      )}
-      switcherIcon={<DownOutlined />}
-      treeData={[antTree]}
-    />
+      }}>
+      <AntTree
+        showIcon
+        showLine
+        titleRender={(node) => {
+          return (
+            <div
+              onMouseEnter={() => {
+                props.onHoveredNode(node.key as Id);
+              }}>
+              {node.title}
+            </div>
+          );
+        }}
+        selectedKeys={[props.selectedNode ?? '']}
+        onSelect={(selected) => {
+          props.onSelectNode(selected[0] as Id);
+        }}
+        defaultExpandAll
+        expandedKeys={[...props.nodes.keys()].filter(
+          (key) => !inactive.includes(key),
+        )}
+        switcherIcon={<DownOutlined />}
+        treeData={[antTree]}
+      />
+    </div>
   );
 }
 

desktop/plugins/public/ui-debugger/components/Visualization2D.tsx

@@ -8,7 +8,7 @@
  */
 
 import React from 'react';
-import {Bounds, Id, Tag, UINode} from '../types';
+import {Id, Tag, UINode} from '../types';
 import {styled, Layout, theme} from 'flipper-plugin';
 import {Typography} from 'antd';
 
@@ -17,44 +17,80 @@ export const Visualization2D: React.FC<
     root: Id;
     nodes: Map<Id, UINode>;
     hoveredNode?: Id;
+    selectedNode?: Id;
     onSelectNode: (id: Id) => void;
+    onHoverNode: (id?: Id) => void;
+    modifierPressed: boolean;
   } & React.HTMLAttributes<HTMLDivElement>
-> = ({root, nodes, hoveredNode, onSelectNode}) => {
+> = ({
+  root,
+  nodes,
+  hoveredNode,
+  selectedNode,
+  onSelectNode,
+  onHoverNode,
+  modifierPressed,
+}) => {
+  //todo, do a bfs search for the first bounds found
+  const rootBounds = nodes.get(root)?.bounds;
+
+  if (!rootBounds) {
+    return null;
+  }
   return (
     <Layout.Container gap="large">
       <Typography.Title>Visualizer</Typography.Title>
 
       <div
+        onMouseLeave={(e) => {
+          e.stopPropagation();
+          onHoverNode(undefined);
+        }}
         style={{
-          //this sets the reference frame for the absolute positioning
-          //of the individual absolutely positioned nodes
+          /**
+           * This relative position is so the root visualization 2DNode and outer border has a non static element to
+           * position itself relative to.
+           *
+           * Subsequent Visualization2DNode are positioned relative to their parent as each one is position absolute
+           * which despite the name acts are a reference point for absolute positioning...
+           */
           position: 'relative',
+          width: toPx(rootBounds.width),
+          height: toPx(rootBounds.height),
         }}>
+        <OuterBorder />
         <Visualization2DNode
-          isRoot
           nodeId={root}
           nodes={nodes}
           hoveredNode={hoveredNode}
+          selectedNode={selectedNode}
           onSelectNode={onSelectNode}
+          onHoverNode={onHoverNode}
+          modifierPressed={modifierPressed}
         />
-        ;
       </div>
     </Layout.Container>
   );
 };
 
 function Visualization2DNode({
+  parentId,
   nodeId,
   nodes,
-  isRoot,
   hoveredNode,
+  selectedNode,
   onSelectNode,
+  onHoverNode,
+  modifierPressed,
 }: {
-  isRoot: boolean;
   nodeId: Id;
+  parentId?: Id;
   nodes: Map<Id, UINode>;
+  modifierPressed: boolean;
   hoveredNode?: Id;
+  selectedNode?: Id;
   onSelectNode: (id: Id) => void;
+  onHoverNode: (id?: Id) => void;
 }) {
   const node = nodes.get(nodeId);
 
@@ -63,27 +99,34 @@ function Visualization2DNode({
   }
 
   const isHovered = hoveredNode === nodeId;
+  const isSelected = selectedNode === nodeId;
 
   let childrenIds: Id[] = [];
 
-  if (!isHovered) {
-    //if there is an active child don't draw the other children
-    //this means we don't draw overlapping activities / tabs etc
-    if (node.activeChild) {
-      childrenIds = [node.activeChild];
-    } else {
-      childrenIds = node.children;
-    }
+  //if there is an active child don't draw the other children
+  //this means we don't draw overlapping activities / tabs etc
+  if (node.activeChild) {
+    childrenIds = [node.activeChild];
+  } else {
+    childrenIds = node.children;
+  }
+  // stop drawing children if hovered with the modifier so you
+  // can see parent views without their children getting in the way
+  if (isHovered && modifierPressed) {
+    childrenIds = [];
   }
 
   const children = childrenIds.map((childId) => (
     <Visualization2DNode
-      isRoot={false}
+      parentId={nodeId}
       key={childId}
       nodeId={childId}
       nodes={nodes}
       hoveredNode={hoveredNode}
       onSelectNode={onSelectNode}
+      onHoverNode={onHoverNode}
+      selectedNode={selectedNode}
+      modifierPressed={modifierPressed}
     />
   ));
 
@@ -93,50 +136,88 @@ function Visualization2DNode({
 
   const isZeroWidthOrHeight =
     node.bounds?.height === 0 || node.bounds?.width === 0;
+
+  const bounds = node.bounds ?? {x: 0, y: 0, width: 0, height: 0};
+
   return (
-    <BoundsBox
+    <div
+      role="button"
+      tabIndex={0}
+      style={{
+        position: 'absolute',
+        cursor: 'pointer',
+        left: toPx(bounds.x),
+        top: toPx(bounds.y),
+        width: toPx(bounds.width),
+        height: toPx(bounds.height),
+        backgroundColor: isSelected
+          ? theme.primaryColor
+          : isHovered
+          ? theme.selectionBackgroundColor
+          : 'transparent',
+      }}
+      onMouseEnter={(e) => {
+        e.stopPropagation();
+        onHoverNode(nodeId);
+      }}
+      onMouseLeave={(e) => {
+        e.stopPropagation();
+        onHoverNode(parentId);
+      }}
       onClick={(e) => {
         e.stopPropagation();
         onSelectNode(nodeId);
-      }}
-      bounds={node.bounds}
-      isRoot={isRoot}
-      tags={node.tags}
-      isHovered={isHovered}>
+      }}>
+      <NodeBorder tags={node.tags}></NodeBorder>
+
       {/* Dirty hack to avoid showing highly overlapping text */}
       {!hasOverlappingChild && !isZeroWidthOrHeight && node.bounds
         ? node.name
         : null}
       {children}
-    </BoundsBox>
+    </div>
   );
 }
 
-const BoundsBox = styled.div<{
-  bounds?: Bounds;
-  isRoot: boolean;
-  isHovered: boolean;
-  tags: Tag[];
-}>((props) => {
-  const bounds = props.bounds ?? {x: 0, y: 0, width: 0, height: 0};
-  return {
-    // borderWidth: props.isRoot ? '5px' : '1px',
-    cursor: 'pointer',
-    borderWidth: '1px',
-    //to offset the border
-    margin: '-1px',
-    borderColor: props.tags.includes('Declarative')
-      ? 'green'
-      : props.tags.includes('Native')
-      ? 'blue'
-      : 'black',
-    borderStyle: 'solid',
-    position: 'absolute',
-    backgroundColor: props.isHovered ? theme.selectionBackgroundColor : 'white',
-    //todo need to understand why its so big and needs halving
-    left: bounds.x / 2,
-    top: bounds.y / 2,
-    width: bounds.width / 2,
-    height: bounds.height / 2,
-  };
+/**
+ * this is the border that shows the green or blue line, it is implemented as a sibling to the
+ * node itself so that it has the same size but the border doesnt affect the sizing of its children
+ * as border is part of the box model
+ */
+const NodeBorder = styled.div<{tags: Tag[]}>((props) => ({
+  position: 'absolute',
+  top: 0,
+  left: 0,
+  bottom: 0,
+  right: 0,
+  borderWidth: '1px',
+  borderStyle: 'solid',
+  color: 'transparent',
+  borderColor: props.tags.includes('Declarative')
+    ? 'green'
+    : props.tags.includes('Native')
+    ? 'blue'
+    : 'black',
+}));
+
+const outerBorderWidth = '10px';
+const outerBorderOffset = `-${outerBorderWidth}`;
+
+//this is the thick black border around the whole vizualization, the border goes around the content
+//hence the top,left,right,botton being negative to increase its size
+const OuterBorder = styled.div({
+  boxSizing: 'border-box',
+  position: 'absolute',
+  top: outerBorderOffset,
+  left: outerBorderOffset,
+  right: outerBorderOffset,
+  bottom: outerBorderOffset,
+  borderWidth: outerBorderWidth,
+  borderStyle: 'solid',
+  borderColor: 'black',
+  borderRadius: '10px',
 });
+
+function toPx(n: number) {
+  return `${n / 2}px`;
+}

desktop/plugins/public/ui-debugger/components/main.tsx

@@ -23,6 +23,7 @@ import {Id, UINode} from '../types';
 import {PerfStats} from './PerfStats';
 import {Tree} from './Tree';
 import {Visualization2D} from './Visualization2D';
+import {useKeyboardModifiers} from '../hooks/useKeyboardModifiers';
 
 export function Component() {
   const instance = usePlugin(plugin);
@@ -35,6 +36,8 @@ export function Component() {
 
   useHotkeys('ctrl+i', () => setShowPerfStats((show) => !show));
 
+  const {ctrlPressed} = useKeyboardModifiers();
+
   function renderAttributesInspector(node: UINode | undefined) {
     if (!node) {
       return;
@@ -69,7 +72,10 @@ export function Component() {
               root={rootId}
               nodes={nodes}
               hoveredNode={hoveredNode}
+              onHoverNode={setHoveredNode}
+              selectedNode={selectedNode}
               onSelectNode={setSelectedNode}
+              modifierPressed={ctrlPressed}
             />
           </Layout.Horizontal>
         </Layout.ScrollContainer>