[Refactor] useFloatWidget composable (#2504)

src/utils/mathUtil.ts

@@ -0,0 +1,32 @@
+import type { InputSpec } from '@/types/apiTypes'
+
+export function getNumberDefaults(
+  inputOptions: InputSpec[1],
+  options: {
+    defaultStep: number
+    precision?: number
+    enableRounding: boolean
+  }
+) {
+  const { defaultStep } = options
+  const {
+    default: defaultVal = 0,
+    min = 0,
+    max = 2048,
+    step = defaultStep
+  } = inputOptions
+  // precision is the number of decimal places to show.
+  // by default, display the the smallest number of decimal places such that changes of size step are visible.
+  const { precision = Math.max(-Math.floor(Math.log10(step)), 0) } = options
+
+  let round = inputOptions.round
+  if (options.enableRounding && (round == undefined || round === true)) {
+    // by default, round the value to those decimal places shown.
+    round = Math.round(1000000 * Math.pow(0.1, precision)) / 1000000
+  }
+
+  return {
+    val: defaultVal,
+    config: { min, max, step: 10.0 * step, round, precision }
+  }
+}