docs(storybook): Grid support for stories

.storybook/addons/withGrid.jsx

@@ -0,0 +1,78 @@
+import React, { useEffect, useRef } from "react";
+
+const GRID = [
+  {
+    value: false,
+    title: "Grid: Off",
+  },
+  {
+    value: true,
+    title: "Grid: On",
+  },
+];
+
+export const gridType = {
+  grid: {
+    name: "Grid",
+    description: "Global grid for components",
+    defaultValue: GRID[0].value,
+    toolbar: {
+      title: "Grid",
+      items: GRID,
+      dynamicTitle: true,
+    },
+  },
+};
+
+const removeGridFromDocs = () => {
+  document.querySelectorAll(".docs-story").forEach((docStory) => {
+    docStory.classList.remove("u-baseline-grid");
+  });
+};
+
+const removeGridFromStory = () => {
+  document.body.classList.remove("u-baseline-grid");
+};
+
+const clearGrid = () => {
+  removeGridFromStory();
+  removeGridFromDocs();
+};
+
+const addGridToDocs = () => {
+  removeGridFromStory();
+  document.querySelectorAll(".docs-story").forEach((docStory) => {
+    docStory.classList.add("u-baseline-grid");
+  });
+};
+
+const addGridToStory = () => {
+  removeGridFromDocs();
+  document.body.classList.add("u-baseline-grid");
+};
+
+export const WithGridProvider = (Story, context) => {
+  const {
+    viewMode,
+    globals: { grid },
+  } = context;
+  const isDocs = viewMode === "docs";
+  const gridRef = useRef(false);
+
+  useEffect(() => {
+    if (gridRef.current !== grid) {
+      if (grid) {
+        if (isDocs) {
+          addGridToDocs();
+        } else {
+          addGridToStory();
+        }
+      } else {
+        clearGrid();
+      }
+      gridRef.current = grid;
+    }
+  }, [grid, isDocs]);
+
+  return <Story {...context} />;
+};

.storybook/preview.js

@@ -1,16 +1,20 @@
 import { themes } from "@storybook/theming";
 import "vanilla-framework/scss/build.scss";
 import { themeType, WithThemeProvider } from "./addons/withTheme";
+import { gridType, WithGridProvider } from "./addons/withGrid";
 
 export const parameters = {
   docs: {
     theme: themes.vanillaish,
   },
   backgrounds: {
+    grid: {
+      disable: true,
+    },
     disable: true,
   },
 };
 
-export const decorators = [WithThemeProvider];
+export const decorators = [WithThemeProvider, WithGridProvider];
 
-export const globalTypes = themeType;
+export const globalTypes = { ...themeType, ...gridType };