feat(component): add NumberInput

Closes #21

src/components/NumberInput/NumberInput.Skeleton.svelte

@@ -0,0 +1,15 @@
+<script>
+  let className = undefined;
+  export { className as class };
+  export let hideLabel = false;
+  export let style = undefined;
+
+  import { cx } from '../../lib';
+</script>
+
+<div on:click on:mouseover on:mouseenter on:mouseleave class={cx('--form-item', className)} {style}>
+  {#if !hideLabel}
+    <span class={cx('--label', '--skeleton')} />
+  {/if}
+  <div class={cx('--number', '--skeleton')} />
+</div>

src/components/NumberInput/NumberInput.Story.svelte

@@ -0,0 +1,23 @@
+<script>
+  export let story = undefined;
+
+  import Layout from '../../internal/ui/Layout.svelte';
+  import NumberInput from './NumberInput.svelte';
+  import NumberInputSkeleton from './NumberInput.Skeleton.svelte';
+
+  let value = $$props.value;
+</script>
+
+<Layout>
+  {#if story === 'skeleton'}
+    <NumberInputSkeleton {...$$props} />
+  {:else}
+    <NumberInput
+      {...$$props}
+      id="slider"
+      bind:value
+      on:change={({ detail }) => {
+        console.log('on:change', detail);
+      }} />
+  {/if}
+</Layout>

src/components/NumberInput/NumberInput.stories.js

@@ -0,0 +1,32 @@
+import { withKnobs, text, boolean, number } from '@storybook/addon-knobs';
+import Component from './NumberInput.Story.svelte';
+
+export default { title: 'NumberInput', decorators: [withKnobs] };
+
+export const Default = () => ({
+  Component,
+  props: {
+    id: 'number-input',
+    label: text('Label (label)', 'Number Input label'),
+    hideLabel: boolean('Hide label (hideLabel)', false),
+    min: number('Minimum value (min)', 0),
+    max: number('Maximum value (max)', 100),
+    value: number('Value (value)', 50),
+    step: number('Step of up/down arrow (step)', 10),
+    disabled: boolean('Disabled (disabled)', false),
+    readonly: boolean('Read only (readonly)', false),
+    invalid: boolean('Show form validation UI (invalid)', false),
+    isMobile: boolean('Mobile variant', false),
+    invalidText: text('Form validation UI content (invalidText)', 'Number is not valid'),
+    helperText: text('Helper text (helperText)', 'Optional helper text.'),
+    light: boolean('Light variant (light)', false)
+  }
+});
+
+export const Skeleton = () => ({
+  Component,
+  props: {
+    story: 'skeleton',
+    hideLabel: boolean('Hide label (hideLabel)', false)
+  }
+});

src/components/NumberInput/NumberInput.svelte

@@ -0,0 +1,183 @@
+<script>
+  let className = undefined;
+  export { className as class };
+  export let disabled = false;
+  export let hideLabel = false;
+  export let iconDescription = '';
+  export let id = Math.random();
+  export let label = '';
+  export let max = undefined;
+  export let min = undefined;
+  export let step = 1;
+  export let value = '';
+  export let readonly = false;
+  export let invalid = false;
+  export let invalidText = 'Provide invalidText';
+  export let helperText = '';
+  export let light = false;
+  export let allowEmpty = false;
+  export let isMobile = false;
+  export const translationIds = { increment: 'increment', decrement: 'decrement' };
+  export let translateWithId = id => defaultTranslations[id];
+  export let style = undefined;
+
+  import { createEventDispatcher, afterUpdate } from 'svelte';
+  import WarningFilled16 from 'carbon-icons-svelte/lib/WarningFilled16';
+  import CaretDownGlyph from 'carbon-icons-svelte/lib/CaretDownGlyph';
+  import CaretUpGlyph from 'carbon-icons-svelte/lib/CaretUpGlyph';
+  import { cx } from '../../lib';
+
+  const defaultTranslations = {
+    [translationIds.increment]: 'Increment number',
+    [translationIds.decrement]: 'Decrement number'
+  };
+
+  const dispatch = createEventDispatcher();
+
+  function updateValue(direction) {
+    const nextValue = (value += direction * step);
+
+    if (nextValue < min) {
+      value = min;
+    } else if (nextValue > max) {
+      value = max;
+    } else {
+      value = nextValue;
+    }
+  }
+
+  afterUpdate(() => {
+    dispatch('change', value);
+  });
+
+  $: incrementLabel = translateWithId('increment');
+  $: decrementLabel = translateWithId('decrement');
+  $: value = Number(value);
+  $: error = invalid || (!allowEmpty && value === '') || value > max || value < min;
+  $: errorId = `error-${id}`;
+  $: ariaLabel =
+    $$props['aria-label'] || 'Numeric input field with increment and decrement buttons';
+</script>
+
+<div on:click on:mouseover on:mouseenter on:mouseleave class={cx('--form-item', className)} {style}>
+  <div
+    data-invalid={error || undefined}
+    class={cx('--number', '--number--helpertext', readonly && '--number--readonly', light && '--number--light', hideLabel && '--number--nolabel', isMobile && '--number--mobile')}>
+    {#if isMobile}
+      {#if label}
+        <label class={cx('--label', hideLabel && '--visually-hidden')} for={id}>
+          <slot name="label">{label}</slot>
+        </label>
+      {/if}
+      {#if helperText}
+        <div class={cx('--form__helper-text')}>{helperText}</div>
+      {/if}
+      <div class={cx('--number__input-wrapper')}>
+        <button
+          type="button"
+          aria-live="polite"
+          aria-atomic="true"
+          title={decrementLabel}
+          aria-label={decrementLabel || iconDescription}
+          class={cx('--number__control-btn', 'down-icon')}
+          on:click={() => {
+            updateValue(-1);
+          }}
+          {disabled}>
+          <CaretDownGlyph class="down-icon" />
+        </button>
+        <input
+          type="number"
+          pattern="[0-9]*"
+          aria-label={label ? undefined : ariaLabel}
+          on:input
+          on:input={({ target }) => {
+            value = target.value;
+          }}
+          {disabled}
+          {id}
+          {max}
+          {min}
+          {step}
+          {value}
+          {readonly} />
+        <button
+          type="button"
+          aria-live="polite"
+          aria-atomic="true"
+          title={incrementLabel}
+          aria-label={incrementLabel || iconDescription}
+          class={cx('--number__control-btn', 'up-icon')}
+          on:click={() => {
+            updateValue(1);
+          }}
+          {disabled}>
+          <CaretUpGlyph class="up-icon" />
+        </button>
+      </div>
+    {:else}
+      {#if label}
+        <label class={cx('--label', hideLabel && '--visually-hidden')} for={id}>
+          <slot name="label">{label}</slot>
+        </label>
+      {/if}
+      {#if helperText}
+        <div class={cx('--form__helper-text')}>{helperText}</div>
+      {/if}
+      <div class={cx('--number__input-wrapper')}>
+        <input
+          type="number"
+          pattern="[0-9]*"
+          aria-describedby={errorId}
+          data-invalid={invalid || undefined}
+          aria-invalid={invalid || undefined}
+          aria-label={label ? undefined : ariaLabel}
+          on:input
+          on:input={({ target }) => {
+            value = target.value;
+          }}
+          {disabled}
+          {id}
+          {max}
+          {min}
+          {step}
+          {value}
+          {readonly} />
+        {#if invalid}
+          <WarningFilled16 class={cx('--number__invalid')} />
+        {/if}
+        <div class={cx('--number__controls')}>
+          <button
+            type="button"
+            aria-live="polite"
+            aria-atomic="true"
+            title={incrementLabel || iconDescription}
+            aria-label={incrementLabel || iconDescription}
+            class={cx('--number__control-btn', 'up-icon')}
+            on:click={() => {
+              updateValue(1);
+            }}
+            {disabled}>
+            <CaretUpGlyph class="up-icon" />
+          </button>
+          <button
+            type="button"
+            aria-live="polite"
+            aria-atomic="true"
+            title={decrementLabel || iconDescription}
+            aria-label={decrementLabel || iconDescription}
+            class={cx('--number__control-btn', 'down-icon')}
+            on:click={() => {
+              updateValue(-1);
+            }}
+            {disabled}>
+            <CaretDownGlyph class="down-icon" />
+          </button>
+        </div>
+      </div>
+    {/if}
+    {#if error}
+      <div class={cx('--form-requirement')} id={errorId}>{invalidText}</div>
+    {/if}
+  </div>
+</div>

src/components/NumberInput/index.js

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+import NumberInput from './NumberInput.svelte';
+
+export default NumberInput;
+export { default as NumberInputSkeleton } from './NumberInput.Skeleton.svelte';