refactor(server): canonicalize service API (#31049)

packages/tui/src/util/scroll.ts

@@ -0,0 +1,27 @@
+import { MacOSScrollAccel, type ScrollAcceleration } from "@opentui/core"
+
+export type ScrollConfig = {
+  scroll_acceleration?: { enabled?: boolean }
+  scroll_speed?: number
+}
+
+export class CustomSpeedScroll implements ScrollAcceleration {
+  constructor(private speed: number) {}
+
+  tick(_now?: number): number {
+    return this.speed
+  }
+
+  reset(): void {}
+}
+
+export function getScrollAcceleration(tuiConfig?: ScrollConfig): ScrollAcceleration {
+  if (tuiConfig?.scroll_acceleration?.enabled) {
+    return new MacOSScrollAccel()
+  }
+  if (tuiConfig?.scroll_speed !== undefined) {
+    return new CustomSpeedScroll(tuiConfig.scroll_speed)
+  }
+
+  return new CustomSpeedScroll(3)
+}