[Init] Initial commit - NetMesh terminal manager

components/terminal/terminalThemeScheduler.ts

@@ -0,0 +1,75 @@
+import type { Terminal } from '@xterm/xterm';
+import type { TerminalTheme } from '../../domain/models';
+import { forceSyncRenderAfterResize } from './terminalHelpers';
+
+type PendingUpdate = {
+  theme: TerminalTheme;
+  getTerminal: () => Terminal | null;
+};
+
+const pendingBySession = new Map<string, PendingUpdate>();
+let flushScheduled = false;
+
+function themeFingerprint(theme: TerminalTheme): string {
+  return `${theme.id}:${theme.colors.background}:${theme.colors.foreground}:${theme.colors.cursor}`;
+}
+
+function applyThemeToTerminal(term: Terminal, theme: TerminalTheme): void {
+  term.options.theme = {
+    ...theme.colors,
+    selectionBackground: theme.colors.selection,
+    scrollbarSliderBackground: theme.colors.foreground + '33',
+    scrollbarSliderHoverBackground: theme.colors.foreground + '66',
+    scrollbarSliderActiveBackground: theme.colors.foreground + '80',
+  };
+  forceSyncRenderAfterResize(term);
+}
+
+export function applyTerminalThemeSync(term: Terminal, theme: TerminalTheme): void {
+  applyThemeToTerminal(term, theme);
+}
+
+function flushPendingUpdates(): void {
+  flushScheduled = false;
+  const entries = [...pendingBySession.entries()];
+  pendingBySession.clear();
+
+  for (const [, update] of entries) {
+    const term = update.getTerminal();
+    if (!term) continue;
+    applyThemeToTerminal(term, update.theme);
+  }
+}
+
+export function cancelTerminalThemeUpdate(sessionId: string): void {
+  pendingBySession.delete(sessionId);
+}
+
+export function scheduleTerminalThemeUpdate(
+  sessionId: string,
+  theme: TerminalTheme,
+  _options: { visible: boolean; focused: boolean },
+  getTerminal: () => Terminal | null,
+): void {
+  const existing = pendingBySession.get(sessionId);
+  if (existing && themeFingerprint(existing.theme) === themeFingerprint(theme)) {
+    pendingBySession.set(sessionId, {
+      theme,
+      getTerminal,
+    });
+  } else {
+    pendingBySession.set(sessionId, {
+      theme,
+      getTerminal,
+    });
+  }
+
+  if (flushScheduled) return;
+  flushScheduled = true;
+  queueMicrotask(flushPendingUpdates);
+}
+
+export function resetTerminalThemeSchedulerForTests(): void {
+  pendingBySession.clear();
+  flushScheduled = false;
+}