From cafc7ce350e8a35a2811daeb15a25c9d830d1b46 Mon Sep 17 00:00:00 2001
From: Philipp Fromme <philipp.fromme@camunda.com>
Date: Tue, 10 Dec 2024 13:37:12 +0100
Subject: [PATCH] feat: add dropdown

---
 src/assets/properties-panel.css     |  36 ++++++++
 src/components/entries/TextField.js | 131 ++++++++++++++++++++++++----
 2 files changed, 149 insertions(+), 18 deletions(-)

diff --git a/src/assets/properties-panel.css b/src/assets/properties-panel.css
index b0311ace..30c4f1f0 100644
--- a/src/assets/properties-panel.css
+++ b/src/assets/properties-panel.css
@@ -499,6 +499,42 @@
   font-family: inherit;
 }
 
+.bio-properties-panel-textfield-dropdown-wrapper {
+  position: relative;
+}
+
+.bio-properties-panel-textfield-dropdown {
+  display: none;
+  position: absolute;
+  top: 100%;
+  left: 0;
+  width: 100%;
+  z-index: 100;
+  background-color: var(--color-grey-225-10-95);
+  border: 1px solid var(--color-grey-225-10-75);
+}
+
+.bio-properties-panel-textfield-dropdown-open {
+  display: block;
+}
+
+.bio-properties-panel-textfield-dropdown-options {
+  list-style: none;
+  padding: 0;
+  margin: 0;
+}
+
+.bio-properties-panel-textfield-dropdown-option {
+  padding: 2px 6px;
+}
+
+.bio-properties-panel-textfield-dropdown-option:focus,
+.bio-properties-panel-textfield-dropdown-option:hover,
+.bio-properties-panel-textfield-dropdown-option-selected {
+  background-color: var(--color-blue-205-100-50);
+  color: var(--color-white);
+}
+
 .bio-properties-panel-input[type=number],
 select.bio-properties-panel-input,
 textarea.bio-properties-panel-input,
diff --git a/src/components/entries/TextField.js b/src/components/entries/TextField.js
index 15012ce8..0b12cee5 100644
--- a/src/components/entries/TextField.js
+++ b/src/components/entries/TextField.js
@@ -9,12 +9,13 @@ import {
 
 import classnames from 'classnames';
 
-import { isFunction } from 'min-dash';
+import { isFunction, set } from 'min-dash';
 
 import {
   useError,
   useShowEntryEvent
 } from '../../hooks';
+import classNames from 'classnames';
 
 function Textfield(props) {
 
@@ -24,14 +25,32 @@ function Textfield(props) {
     id,
     label,
     onInput,
-    onFocus,
-    onBlur,
+    onFocus: _onFocus,
+    onBlur: _onBlur,
     placeholder,
     value = '',
-    tooltip
+    tooltip,
+    dropdown = {
+      options: [
+        {
+          value: 'foo'
+        },
+        {
+          value: 'bar'
+        },
+        {
+          value: 'baz'
+        }
+      ],
+      text: 'Foo bar!'
+    }
   } = props;
 
   const [ localValue, setLocalValue ] = useState(value || '');
+  const [ dropdownOptions, setDropdownOptions ] = useState([]);
+  const [ dropdownOpen, setDropdownOpen ] = useState(false);
+  const [ dropdownOptionSelected, setDropdownOptionSelected ] = useState(0);
+  const [ isFocused, setIsFocused ] = useState(false);
 
   const ref = useShowEntryEvent(id);
 
@@ -44,6 +63,31 @@ function Textfield(props) {
     setLocalValue(e.target.value);
   };
 
+  const onFocus = e => {
+    setIsFocused(true);
+    isFunction(_onFocus) && _onFocus(e);
+  };
+
+  const onBlur = e => {
+    setIsFocused(false);
+    isFunction(_onBlur) && _onBlur(e);
+  };
+
+  const onKeydown = e => {
+    if (isFocused && e.key === 'Escape') {
+      setDropdownOpen(false);
+    } else if (isFocused && e.key === 'ArrowUp') {
+      e.preventDefault();
+      setDropdownOptionSelected(Math.max(0, dropdownOptionSelected - 1));
+    } else if (isFocused && e.key === 'ArrowDown') {
+      e.preventDefault();
+      setDropdownOptionSelected(Math.min(dropdownOptions.length - 1, dropdownOptionSelected + 1));
+    } else if (isFocused && e.key === 'Enter') {
+      handleInput({ target: { value: dropdownOptions[dropdownOptionSelected].value } });
+      setDropdownOpen(false);
+    }
+  };
+
   useEffect(() => {
     if (value === localValue) {
       return;
@@ -52,6 +96,27 @@ function Textfield(props) {
     setLocalValue(value);
   }, [ value ]);
 
+  useEffect(() => {
+    if (!dropdown) {
+      return;
+    }
+
+    setDropdownOptions(dropdown.options.filter(option => option.value.startsWith(localValue)));
+  }, [ localValue ]);
+
+  useEffect(() => {
+    setDropdownOpen(dropdownOptions.length > 0 && isFocused);
+    setDropdownOptionSelected(Math.max(Math.min(dropdownOptions.length - 1, dropdownOptionSelected), 0));
+  }, [ dropdownOptions, isFocused ]);
+
+  useEffect(() => {
+    if (!dropdownOpen) {
+      setDropdownOptionSelected(0);
+    }
+  }, [ dropdownOpen ]);
+
+  console.log('selected', dropdownOptionSelected);
+
   return (
     <div class="bio-properties-panel-textfield">
       <label for={ prefixId(id) } class="bio-properties-panel-label">
@@ -59,20 +124,50 @@ function Textfield(props) {
           { label }
         </Tooltip>
       </label>
-      <input
-        ref={ ref }
-        id={ prefixId(id) }
-        type="text"
-        name={ id }
-        spellCheck="false"
-        autoComplete="off"
-        disabled={ disabled }
-        class="bio-properties-panel-input"
-        onInput={ handleInput }
-        onFocus={ onFocus }
-        onBlur={ onBlur }
-        placeholder={ placeholder }
-        value={ localValue } />
+      <div class="bio-properties-panel-textfield-dropdown-wrapper">
+        <input
+          ref={ ref }
+          id={ prefixId(id) }
+          type="text"
+          name={ id }
+          spellCheck="false"
+          autoComplete="off"
+          disabled={ disabled }
+          class="bio-properties-panel-input"
+          onInput={ handleInput }
+          onKeyDown={ onKeydown }
+          onFocus={ onFocus }
+          onBlur={ onBlur }
+          placeholder={ placeholder }
+          value={ localValue } />
+        {
+          dropdownOpen && <div class={
+            classNames('bio-properties-panel-textfield-dropdown', {
+              'bio-properties-panel-textfield-dropdown-open': true
+            })
+          }>
+            {
+              dropdownOptions.length && <ul class="bio-properties-panel-textfield-dropdown-options">
+                {
+                  dropdownOptions.map((option, index) => {
+                    return <li
+                      class={
+                        classNames('bio-properties-panel-textfield-dropdown-option', {
+                          'bio-properties-panel-textfield-dropdown-option-selected': dropdownOptionSelected === index
+                        })
+                      }
+                      key={ index }
+                      onClick={ () => handleInput({ target: { value: option.value } }) }
+                    >
+                      { option.value }
+                    </li>;
+                  })
+                }
+              </ul>
+            }
+          </div>
+        }
+      </div>
     </div>
   );
 }