Add checkbox toggle for boolean values (#19714)

* added a checkbox which appears to the right of a value when value is boolean
* checkbox with toggle capability created for boolean props

Co-authored-by: Brian Vaughn <brian.david.vaughn@gmail.com>

packages/react-devtools-shared/src/devtools/views/Components/EditableValue.css

@@ -1,13 +1,7 @@
-.CheckboxLabel {
-  flex: 1 1 100%;
-  display: flex;
-}
-.CheckboxLabel:focus-within {
-  background-color: var(--color-button-background-focus);
-}
-
-.Checkbox:focus {
-  outline: none;
+.Checkbox {
+  flex: 0 0 auto;
+  align-self: center;
+  margin: 0 0.25rem;
 }
 
 .Input {

packages/react-devtools-shared/src/devtools/views/Components/EditableValue.js

@@ -8,7 +8,7 @@
  */
 
 import * as React from 'react';
-import {Fragment, useRef} from 'react';
+import {Fragment} from 'react';
 import styles from './EditableValue.css';
 import {useEditableValue} from '../hooks';
 
@@ -27,7 +27,6 @@ export default function EditableValue({
   path,
   value,
 }: EditableValueProps) {
-  const inputRef = useRef<HTMLInputElement | null>(null);
   const [state, dispatch] = useEditableValue(value);
   const {editableValue, hasPendingChanges, isValid, parsedValue} = state;
 
@@ -44,6 +43,21 @@ export default function EditableValue({
       externalValue: value,
     });
 
+  const handleCheckBoxToggle = ({target}) => {
+    dispatch({
+      type: 'UPDATE',
+      editableValue: target.checked,
+      externalValue: value,
+    });
+
+    // Unlike <input type="text"> which has both an onChange and an onBlur,
+    // <input type="checkbox"> updates state *and* applies changes in a single event.
+    // So we read from target.checked rather than parsedValue (which has not yet updated).
+    // We also don't check isValid (because that hasn't changed yet either);
+    // we don't need to check it anyway, since target.checked is always a boolean.
+    overrideValueFn(path, target.checked);
+  };
+
   const handleKeyDown = event => {
     // Prevent keydown events from e.g. change selected element in the tree
     event.stopPropagation();
@@ -73,6 +87,8 @@ export default function EditableValue({
     placeholder = 'Enter valid JSON';
   }
 
+  const isBool = parsedValue === true || parsedValue === false;
+
   return (
     <Fragment>
       <input
@@ -82,10 +98,17 @@ export default function EditableValue({
         onChange={handleChange}
         onKeyDown={handleKeyDown}
         placeholder={placeholder}
-        ref={inputRef}
         type="text"
         value={editableValue}
       />
+      {isBool && (
+        <input
+          className={styles.Checkbox}
+          checked={parsedValue}
+          type="checkbox"
+          onChange={handleCheckBoxToggle}
+        />
+      )}
     </Fragment>
   );
 }