From e048f482410ab9fba8fbffe077955467fb1a71c6 Mon Sep 17 00:00:00 2001
From: Christophe Robillard <christophe.robillard@beta.gouv.fr>
Date: Thu, 11 Feb 2021 15:25:30 +0100
Subject: [PATCH] create ComboMultipleDropdownList component

---
 .../components/ComboMultipleDropdownList.js   | 217 ++++++++++++++++++
 .../loaders/ComboMultipleDropdownList.js      |   5 +
 2 files changed, 222 insertions(+)
 create mode 100644 app/javascript/components/ComboMultipleDropdownList.js
 create mode 100644 app/javascript/loaders/ComboMultipleDropdownList.js

diff --git a/app/javascript/components/ComboMultipleDropdownList.js b/app/javascript/components/ComboMultipleDropdownList.js
new file mode 100644
index 000000000..4665fe2a6
--- /dev/null
+++ b/app/javascript/components/ComboMultipleDropdownList.js
@@ -0,0 +1,217 @@
+import React, {
+  useMemo,
+  useState,
+  useRef,
+  useContext,
+  createContext,
+  useEffect,
+  useLayoutEffect
+} from 'react';
+import PropTypes from 'prop-types';
+import {
+  Combobox,
+  ComboboxInput,
+  ComboboxList,
+  ComboboxOption,
+  ComboboxPopover
+} from '@reach/combobox';
+import '@reach/combobox/styles.css';
+import matchSorter from 'match-sorter';
+import { fire } from '@utils';
+
+const Context = createContext();
+
+function ComboMultipleDropdownList({
+  options,
+  hiddenFieldId,
+  selected,
+  label
+}) {
+  if (label == undefined) {
+    label = 'Choisir une option';
+  }
+  if (Array.isArray(options[0]) == false) {
+    options = options.map((o) => [o, o]);
+  }
+  const inputRef = useRef();
+  const [term, setTerm] = useState('');
+  const [selections, setSelections] = useState(selected);
+  const results = useMemo(
+    () =>
+      (term
+        ? matchSorter(
+            options.filter((o) => !o[0].startsWith('--')),
+            term
+          )
+        : options
+      ).filter((o) => o[0] && !selections.includes(o[1])),
+    [term, selections]
+  );
+  const hiddenField = useMemo(
+    () => document.querySelector(`input[data-uuid="${hiddenFieldId}"]`),
+    [hiddenFieldId]
+  );
+
+  const handleChange = (event) => {
+    setTerm(event.target.value);
+  };
+
+  const saveSelection = (selections) => {
+    setSelections(selections);
+    if (hiddenField) {
+      hiddenField.setAttribute('value', JSON.stringify(selections));
+      fire(hiddenField, 'autosave:trigger');
+    }
+  };
+
+  const onSelect = (value) => {
+    let sel = options.find((o) => o[0] == value)[1];
+    saveSelection([...selections, sel]);
+    setTerm('');
+  };
+
+  const onRemove = (value) => {
+    saveSelection(
+      selections.filter((s) => s !== options.find((o) => o[0] == value)[1])
+    );
+    inputRef.current.focus();
+  };
+
+  return (
+    <Combobox openOnFocus={true} onSelect={onSelect} aria-label={label}>
+      <ComboboxTokenLabel onRemove={onRemove}>
+        <ul
+          aria-live="polite"
+          aria-atomic={true}
+          data-reach-combobox-token-list
+        >
+          {selections.map((selection) => (
+            <ComboboxToken
+              key={selection}
+              value={options.find((o) => o[1] == selection)[0]}
+            />
+          ))}
+        </ul>
+        <ComboboxInput
+          ref={inputRef}
+          value={term}
+          onChange={handleChange}
+          autocomplete={false}
+        />
+      </ComboboxTokenLabel>
+      {results && (
+        <ComboboxPopover portal={false}>
+          {results.length === 0 && (
+            <p>
+              Aucun résultat{' '}
+              <button
+                onClick={() => {
+                  setTerm('');
+                }}
+              >
+                Effacer
+              </button>
+            </p>
+          )}
+          <ComboboxList>
+            {results.map((value, index) => {
+              if (value[0].startsWith('--')) {
+                return <ComboboxSeparator key={index} value={value[0]} />;
+              }
+              return <ComboboxOption key={index} value={value[0]} />;
+            })}
+          </ComboboxList>
+        </ComboboxPopover>
+      )}
+    </Combobox>
+  );
+}
+
+function ComboboxTokenLabel({ onRemove, ...props }) {
+  const selectionsRef = useRef([]);
+
+  useLayoutEffect(() => {
+    selectionsRef.current = [];
+    return () => (selectionsRef.current = []);
+  });
+
+  const context = {
+    onRemove,
+    selectionsRef
+  };
+
+  return (
+    <Context.Provider value={context}>
+      <div data-combobox-token-label {...props} />
+    </Context.Provider>
+  );
+}
+
+ComboboxTokenLabel.propTypes = {
+  onRemove: PropTypes.func
+};
+
+function ComboboxSeparator({ value }) {
+  return (
+    <li aria-disabled="true" role="option" data-combobox-separator>
+      {value.slice(2, -2)}
+    </li>
+  );
+}
+
+ComboboxSeparator.propTypes = {
+  value: PropTypes.string
+};
+
+function ComboboxToken({ value, ...props }) {
+  const { selectionsRef, onRemove } = useContext(Context);
+  useEffect(() => {
+    selectionsRef.current.push(value);
+  });
+
+  return (
+    <li
+      data-reach-combobox-token
+      tabIndex="0"
+      onKeyDown={(event) => {
+        if (event.key === 'Backspace') {
+          onRemove(value);
+        }
+      }}
+      {...props}
+    >
+      <span
+        role="presentation"
+        data-combobox-remove-token
+        onClick={() => {
+          onRemove(value);
+        }}
+      >
+        x
+      </span>
+      {value}
+    </li>
+  );
+}
+
+ComboboxToken.propTypes = {
+  value: PropTypes.string,
+  label: PropTypes.string
+};
+
+ComboMultipleDropdownList.propTypes = {
+  options: PropTypes.oneOfType([
+    PropTypes.arrayOf(PropTypes.string),
+    PropTypes.arrayOf(
+      PropTypes.arrayOf(
+        PropTypes.oneOfType([PropTypes.string, PropTypes.number])
+      )
+    )
+  ]),
+  hiddenFieldId: PropTypes.string,
+  selected: PropTypes.arrayOf(PropTypes.string),
+  arraySelected: PropTypes.arrayOf(PropTypes.array),
+  label: PropTypes.string
+};
+
+export default ComboMultipleDropdownList;
diff --git a/app/javascript/loaders/ComboMultipleDropdownList.js b/app/javascript/loaders/ComboMultipleDropdownList.js
new file mode 100644
index 000000000..db778b339
--- /dev/null
+++ b/app/javascript/loaders/ComboMultipleDropdownList.js
@@ -0,0 +1,5 @@
+import Loadable from '../components/Loadable';
+
+export default Loadable(() =>
+  import('../components/ComboMultipleDropdownList')
+);