[web] Add a simple Fieldset component

Since PF4/FormFieldGroup[1] looks a bit complex for our use cases right now, we
have wrapped the native HTML fieldset/legend elements in a simple Fieldset
component which also tweaks a little bit their default look&feel.

[1] https://www.patternfly.org/v4/components/form/#formfieldgroup)

web/src/components/core/Fieldset.jsx

@@ -0,0 +1,76 @@
+/*
+ * Copyright (c) [2022] SUSE LLC
+ *
+ * All Rights Reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of version 2 of the GNU General Public License as published
+ * by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, contact SUSE LLC.
+ *
+ * To contact SUSE LLC about this file by physical or electronic mail, you may
+ * find current contact information at www.suse.com.
+ */
+
+// @ts-check
+
+import React from "react";
+import { classNames } from "@/utils";
+
+import "./fieldset.scss";
+
+/**
+ *
+ * Convenient component for grouping form fields in "sections"
+ * by using the native formfield element
+ * @component
+ *
+ * @example <caption>Simple usage</caption>
+ *   <Fieldset legend="Encryption options">
+ *     <EncryptionType />
+ *     <EncryptionPassword />
+ *   </Fieldset>
+ *
+ * @example <caption>Using a complex legend and isDisabled prop</caption>
+ *   <Fieldset
+ *     legend={
+ *       <Switch label="Use Encryption" isChecked={isChecked} onChange={handleChange} isReversed />
+ *     }
+ *     isDisabled={!encryptionAllowed}
+ *   >
+ *     <EncryptionType />
+ *     <EncryptionPassword />
+ *   </Fieldset>
+ *
+ * @param {object} props
+ * @param {React.ReactNode} props.legend - The lengend
+ * @param {boolean} [props.isDisabled=false] - whether the descendant form controls, except any inside legend, are disable
+ * @param {string} [props.className] - additionally CSS class names
+ * @param {JSX.Element} [props.children] - the section content
+ * @param {object} [props.otherProps] fieldset element attributes, see {@link https://html.spec.whatwg.org/#the-fieldset-element}
+ */
+export default function Fieldset({
+  legend,
+  isDisabled,
+  className,
+  children,
+  ...otherProps
+}) {
+  return (
+    <fieldset
+      className={classNames("d-installer-fieldset", className)}
+      disabled={isDisabled}
+      {...otherProps}
+    >
+      {legend && <legend>{legend}</legend>}
+      {children}
+    </fieldset>
+  );
+}

web/src/components/core/Fieldset.test.jsx

@@ -0,0 +1,75 @@
+/*
+ * Copyright (c) [2022] SUSE LLC
+ *
+ * All Rights Reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of version 2 of the GNU General Public License as published
+ * by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, contact SUSE LLC.
+ *
+ * To contact SUSE LLC about this file by physical or electronic mail, you may
+ * find current contact information at www.suse.com.
+ */
+
+import React from "react";
+import { screen, within } from "@testing-library/react";
+import { installerRender } from "@/test-utils";
+import { Fieldset } from "@components/core";
+
+const ComplexLegend = () => {
+  return (
+    <>
+      <label htmlFor="active-fieldset">Using a checkbox in the legend</label>
+      <input type="checkbox" id="active-fieldset" />
+    </>
+  );
+};
+
+describe("Fieldset", () => {
+  it("renders a group element", () => {
+    installerRender(<Fieldset />);
+    const fieldset = screen.getByRole("group");
+    expect(fieldset).toBeInTheDocument();
+  });
+
+  it("renders the given legend", () => {
+    installerRender(<Fieldset legend="Simple legend" />);
+    screen.getByRole("group", { name: /Simple legend/i });
+  });
+
+  it("allows using a complex legend", () => {
+    installerRender(<Fieldset legend={<ComplexLegend />} />);
+    const fieldset = screen.getByRole("group", { name: /Using a checkbox.*/i });
+    const checkbox = within(fieldset).getByRole("checkbox");
+    expect(checkbox).toBeInTheDocument();
+  });
+
+  it("sets children (except legend) as disabled when isDisabled prop is given", () => {
+    installerRender(
+      <Fieldset legend={<ComplexLegend />} isDisabled>
+        <label htmlFor="username">Username</label>
+        <input type="text" id="username" />
+        <label htmlFor="superuser">Superuser</label>
+        <input type="checkbox" id="superuser" />
+      </Fieldset>
+    );
+
+    const fieldset = screen.getByRole("group", { name: /Using a checkbox/i });
+    const legendCheckbox = within(fieldset).getByRole("checkbox", { name: "Using a checkbox in the legend" });
+    const inputText = within(fieldset).getByRole("textbox", { name: "Username" });
+    const checkbox = within(fieldset).getByRole("checkbox", { name: "Superuser" });
+
+    expect(fieldset).toHaveAttribute("disabled");
+    expect(legendCheckbox).not.toBeDisabled();
+    expect(inputText).toBeDisabled();
+    expect(checkbox).toBeDisabled();
+  });
+});

web/src/components/core/fieldset.scss

@@ -0,0 +1,14 @@
+@use "@assets/fonts.scss";
+@use "eos-ds/dist/scss/eos-base/variables/branding.scss";
+
+fieldset.d-installer-fieldset {
+  padding: fonts.$size-base;
+  border: 0;
+  border-top: 1px solid branding.$eos-bc-gray-50;
+  border-image: linear-gradient(45deg, branding.$eos-bc-gray-50, transparent) 1;
+
+  legend {
+    padding-inline-end: fonts.$size-base;
+    margin-inline-start: -(fonts.$size-base);
+  }
+}

web/src/components/core/index.js

@@ -22,6 +22,7 @@
 export { default as About } from "./About";
 export { default as Category } from "./Category";
 export { default as FormLabel } from "./FormLabel";
+export { default as Fieldset } from "./Fieldset";
 export { default as InstallationFinished } from "./InstallationFinished";
 export { default as InstallationProgress } from "./InstallationProgress";
 export { default as InstallButton } from "./InstallButton";