Widgets: add TimezonePicker widget.

package.json

@@ -3,8 +3,9 @@
   "version": "0.4.0",
   "private": true,
   "dependencies": {
-    "@material-ui/core": "^4.6.1",
+    "@material-ui/core": "^4.7.0",
     "@material-ui/icons": "^3.0.2",
+    "@material-ui/lab": "^4.0.0-alpha.33",
     "@material-ui/styles": "^4.6.0",
     "etesync": "^0.1.2",
     "ical.js": "^1.2.2",

src/helpers.tsx

@@ -100,3 +100,7 @@ export function formatOurTimezoneOffset() {
 
   return `GMT${prefix}${hours.toString().padStart(2, '0')}:${minutes.toString().padStart(2, '0')}`;
 }
+
+export function getCurrentTimezone() {
+  return Intl.DateTimeFormat().resolvedOptions().timeZone;
+}

src/widgets/TimezonePicker.tsx

@@ -0,0 +1,28 @@
+import * as React from 'react';
+
+import Autocomplete from '@material-ui/lab/Autocomplete';
+import TextField from '@material-ui/core/TextField';
+
+import * as zones from '../data/zones.json';
+const zonelist = Object.keys(zones.zones).sort();
+
+interface PropsType {
+  value: string | null;
+  onChange: (value: string) => void;
+  style?: React.CSSProperties;
+}
+
+export default React.memo(function TimezonePicker(props: PropsType) {
+  return (
+    <Autocomplete
+      options={zonelist}
+      value={props.value}
+      onChange={(_e, value) => props.onChange(value)}
+      getOptionLabel={(option) => option.replace('_', ' ')}
+      style={props.style}
+      renderInput={(params) => (
+        <TextField {...params} label="Timezone" fullWidth />
+      )}
+    />
+  );
+});

yarn.lock

@@ -1486,10 +1486,10 @@
     "@types/istanbul-reports" "^1.1.1"
     "@types/yargs" "^13.0.0"
 
-"@material-ui/core@^4.6.1":
+"@material-ui/core@^4.7.0":
-  version "4.6.1"
+  version "4.7.0"
-  resolved "https://registry.yarnpkg.com/@material-ui/core/-/core-4.6.1.tgz#039f97443547a88c41d290deabfb4a044c6031ec"
+  resolved "https://registry.yarnpkg.com/@material-ui/core/-/core-4.7.0.tgz#84c02a6d1c99c7900e184538c5f9d87e30cf4c23"
-  integrity sha512-TljDMCJmi1zh7JhAFTp8qjIlbkVACiNftrcitzJJ+hAqpuP9PTO4euEkkAuYjISfUFZl3Z4kaOrBwN1HDrhIOQ==
+  integrity sha512-mwLehUo0Q9ZxjuWo7J1uy1/Grh3nRxlOAaWJ3EtKeJP2HwqlSy8bWrcvRQYlapaYIPXa5jN8zWbTwi8Pk30VQg==
   dependencies:
     "@babel/runtime" "^7.4.4"
     "@material-ui/styles" "^4.6.0"
@@ -1513,6 +1513,16 @@
     "@babel/runtime" "^7.2.0"
     recompose "0.28.0 - 0.30.0"
 
+"@material-ui/lab@^4.0.0-alpha.33":
+  version "4.0.0-alpha.33"
+  resolved "https://registry.yarnpkg.com/@material-ui/lab/-/lab-4.0.0-alpha.33.tgz#3de96da1e813afcea5a07d56e54ec41cfa636e2c"
+  integrity sha512-+xttHUZLwH4+yfkB7B5A3pNDtQO27tGftuUxMRDMevNXwQtAB7mgYco34JwMr9kmvESYmacoZReOacJ6rxym/Q==
+  dependencies:
+    "@babel/runtime" "^7.4.4"
+    "@material-ui/utils" "^4.5.2"
+    clsx "^1.0.4"
+    prop-types "^15.7.2"
+
 "@material-ui/styles@^4.6.0":
   version "4.6.0"
   resolved "https://registry.yarnpkg.com/@material-ui/styles/-/styles-4.6.0.tgz#15679fab6dcbe0cc2416f01a22966f3ea26607c5"