msyavuz commented on code in PR #36486:
URL: https://github.com/apache/superset/pull/36486#discussion_r2653060833
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superset-frontend/packages/superset-ui-core/src/components/TimezoneSelector/index.tsx:
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@@ -45,118 +62,213 @@ const offsetsToName = {
'060': ['GMT Standard Time - London', 'British Summer Time'],
};
-export type TimezoneSelectorProps = {
- onTimezoneChange: (value: string) => void;
- timezone?: string | null;
- minWidth?: string;
-};
+let cachedTimezoneOptions: TimezoneOption[] | null = null;
+let computePromise: Promise<TimezoneOption[]> | null = null;
+
+// Export function to check if options are cached (for parent components)
+export function areTimezoneOptionsCached(): boolean {
+ return cachedTimezoneOptions !== null;
+}
+
+function getOffsetKey(timezoneName: string): string {
+ return (
+ JANUARY_REF.tz(timezoneName).utcOffset().toString() +
+ JULY_REF.tz(timezoneName).utcOffset().toString()
+ );
+}
+
+function getTimezoneDisplayName(
+ timezoneName: string,
+ currentDate: ReturnType<typeof extendedDayjs>,
+): string {
+ const offsetKey = getOffsetKey(timezoneName);
+ const dateInZone = currentDate.tz(timezoneName);
+ const isDSTActive = isDST(dateInZone, timezoneName);
+ const namePair = offsetsToName[offsetKey];
+ return namePair ? (isDSTActive ? namePair[1] : namePair[0]) : timezoneName;
+}
+
+function computeTimezoneOptions(): TimezoneOption[] {
+ const currentDate = extendedDayjs(new Date());
+ const allZones = Intl.supportedValuesOf('timeZone');
+ const seenLabels = new Set<string>();
+ const options: TimezoneOption[] = [];
+
+ for (const zone of allZones) {
+ const offsetKey = getOffsetKey(zone);
+ const displayName = getTimezoneDisplayName(zone, currentDate);
+ const offset = currentDate.tz(zone).format('Z');
+ const label = `GMT ${offset} (${displayName})`;
+
+ if (!seenLabels.has(label)) {
+ seenLabels.add(label);
+ options.push({
+ label,
+ value: zone,
+ offsets: offsetKey,
+ timezoneName: zone,
+ });
+ }
+ }
+
+ cachedTimezoneOptions = options;
Review Comment:
Can we either refactor this into a class to couple the variable and function
tighter or take this variable as an argument?
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