chore(form): add stories for Form, FormItem, FormLabel

src/components/Form/Form.Story.svelte

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+<script>
+  import Layout from '../../internal/ui/Layout.svelte';
+  import Checkbox from '../Checkbox';
+  import FormGroup from '../FormGroup';
+  import FileUploader from '../FileUploader';
+  import NumberInput from '../NumberInput';
+  import RadioButton from '../RadioButton';
+  import RadioButtonGroup from '../RadioButtonGroup';
+  import Button from '../Button';
+  import Search from '../Search';
+  import Select, { SelectItem } from '../Select';
+  import TextArea from '../TextArea';
+  import TextInput from '../TextInput';
+  import Toggle from '../Toggle';
+  import Form from './Form.svelte';
+</script>
+
+<Layout>
+  <Form
+    on:submit={event => {
+      console.log('on:submit', event);
+    }}>
+    <FormGroup {...$$props}>
+      <Checkbox id="checkbox-0" labelText="Checkbox Label" checked />
+      <Checkbox id="checkbox-1" labelText="Checkbox Label" />
+      <Checkbox id="checkbox-2" labelText="Checkbox Label" disabled />
+    </FormGroup>
+    <NumberInput id="number-input-1" label="Number Input" min={0} max={100} value={50} step={10} />
+    <FormGroup legendText="Toggle heading">
+      <Toggle id="toggle-1" />
+      <Toggle id="toggle-2" disabled />
+    </FormGroup>
+    <FormGroup legendText="File Uploader">
+      <FileUploader id="file-1" buttonLabel="Add files" labelDescription="Choose Files..." />
+    </FormGroup>
+    <FormGroup legendText="Radio Button heading">
+      <RadioButtonGroup name="radio-button-group" defaultSelected="default-selected">
+        <RadioButton id="radio-1" value="standard" labelText="Standard Radio Button" />
+        <RadioButton
+          id="radio-2"
+          value="default-selected"
+          labelText="Default Selected Radio Button" />
+        <RadioButton id="radio-3" value="blue" labelText="Standard Radio Button" />
+        <RadioButton id="radio-4" value="disabled" labelText="Disabled Radio Button" disabled />
+      </RadioButtonGroup>
+    </FormGroup>
+    <FormGroup legendText="Search">
+      <Search id="search-1" labelText="Search" placeholder="Search" />
+    </FormGroup>
+    <Select id="select-1" defaultValue="placeholder-item">
+      <SelectItem disabled hidden value="placeholder-item" text="Choose an option" />
+      <SelectItem value="option-1" text="Option 1" />
+      <SelectItem value="option-2" text="Option 2" />
+      <SelectItem value="option-3" text="Option 3" />
+    </Select>
+    <TextInput id="text-input-1" labelText="Text Input label" placeholder="Placeholder text" />
+    <TextInput id="text-input-2" type="password" labelText="Password" required />
+    <TextInput
+      id="text-input-3"
+      type="password"
+      labelText="Password"
+      invalidText="Your password must be at least 6 characters as well as contain at least one
+      uppercase, one lowercase, and one number."
+      required
+      invalid />
+    <TextArea
+      id="text-area"
+      labelText="Text Area label"
+      placeholder="Placeholder text"
+      rows={4}
+      cols={50} />
+    <Button type="submit">Submit</Button>
+  </Form>
+</Layout>

src/components/Form/Form.stories.js

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+import { withKnobs, text, boolean } from '@storybook/addon-knobs';
+import Component from './Form.Story.svelte';
+
+export default { title: 'Form', decorators: [withKnobs] };
+
+export const Default = () => ({
+  Component,
+  props: {
+    legendText: text('Text in <legend> (legendText)', 'Checkbox heading'),
+    message: boolean('Show form requirement (message)', false),
+    messageText: text('Form requirement text (messageText)', ''),
+    invalid: boolean('Mark as invalid (invalid)', false)
+  }
+});

src/components/FormItem/FormItem.Story.svelte

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+<script>
+  import Layout from '../../internal/ui/Layout.svelte';
+  import NumberInput from '../NumberInput';
+  import FormItem from './FormItem.svelte';
+</script>
+
+<Layout>
+  <FormItem>
+    <NumberInput id="number-input-1" />
+  </FormItem>
+</Layout>

src/components/FormItem/FormItem.stories.js

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+import { withKnobs } from '@storybook/addon-knobs';
+import Component from './FormItem.Story.svelte';
+
+export default { title: 'FormItem', decorators: [withKnobs] };
+
+export const Default = () => ({ Component });

src/components/FormLabel/FormLabel.Story.svelte

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+<script>
+  export let story = undefined;
+
+  import Layout from '../../internal/ui/Layout.svelte';
+  import Tooltip from '../Tooltip';
+  import FormLabel from './FormLabel.svelte';
+</script>
+
+<Layout>
+  {#if story === 'tooltip'}
+    <FormLabel>
+      <Tooltip triggerText="Label">This is the content of the tooltip.</Tooltip>
+    </FormLabel>
+  {:else}
+    <FormLabel>Label</FormLabel>
+  {/if}
+</Layout>

src/components/FormLabel/FormLabel.stories.js

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+import { withKnobs } from '@storybook/addon-knobs';
+import Component from './FormLabel.Story.svelte';
+
+export default { title: 'FormLabel', decorators: [withKnobs] };
+
+export const Default = () => ({ Component });
+
+export const WithTooltip = () => ({ Component, props: { story: 'tooltip' } });