Primer ViewComponents v0.15.0

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<!-- Size small -->
<segmented-control>
  <ul aria-label="Billing duration" role="list" data-view-component="true" class="SegmentedControl--small SegmentedControl">
    <li class="SegmentedControl-item" role="listitem" data-targets="segmented-control.items">
      <button data-action="click:segmented-control#select" aria-current="false" type="button" data-view-component="true" class="Button--invisible Button--small Button Button--invisible-noVisuals">  <span class="Button-content">
          <span class="Button-label">Monthly</span>
        </span>
      </button>
    </li>
    <li class="SegmentedControl-item SegmentedControl-item--selected" role="listitem" data-targets="segmented-control.items">
      <button data-action="click:segmented-control#select" aria-current="true" type="button" data-view-component="true" class="Button--invisible Button--small Button">  <span class="Button-content">
          <span class="Button-label">Yearly</span>
          <span class="Button-visual Button-trailingVisual">
            <span data-view-component="true" class="Label Label--accent">-8%</span>
          </span>
        </span>
      </button>
    </li>
  </ul>
</segmented-control>
<!-- Size medium -->
<segmented-control>
  <ul aria-label="Billing duration" role="list" data-view-component="true" class="SegmentedControl--medium SegmentedControl">
    <li class="SegmentedControl-item" role="listitem" data-targets="segmented-control.items">
      <button data-action="click:segmented-control#select" aria-current="false" type="button" data-view-component="true" class="Button--invisible Button--medium Button Button--invisible-noVisuals">  <span class="Button-content">
          <span class="Button-label">Monthly</span>
        </span>
      </button>
    </li>
    <li class="SegmentedControl-item SegmentedControl-item--selected" role="listitem" data-targets="segmented-control.items">
      <button data-action="click:segmented-control#select" aria-current="true" type="button" data-view-component="true" class="Button--invisible Button--medium Button">  <span class="Button-content">
          <span class="Button-label">Yearly</span>
          <span class="Button-visual Button-trailingVisual">
            <span data-view-component="true" class="Label Label--accent">-8%</span>
          </span>
        </span>
      </button>
    </li>
  </ul>
</segmented-control>
<!-- Size large -->
<segmented-control>
  <ul aria-label="Billing duration" role="list" data-view-component="true" class="SegmentedControl--large SegmentedControl">
    <li class="SegmentedControl-item" role="listitem" data-targets="segmented-control.items">
      <button data-action="click:segmented-control#select" aria-current="false" type="button" data-view-component="true" class="Button--invisible Button--large Button Button--invisible-noVisuals">  <span class="Button-content">
          <span class="Button-label">Monthly</span>
        </span>
      </button>
    </li>
    <li class="SegmentedControl-item SegmentedControl-item--selected" role="listitem" data-targets="segmented-control.items">
      <button data-action="click:segmented-control#select" aria-current="true" type="button" data-view-component="true" class="Button--invisible Button--large Button">  <span class="Button-content">
          <span class="Button-label">Yearly</span>
          <span class="Button-visual Button-trailingVisual">
            <span data-view-component="true" class="Label Label--accent">-8%</span>
          </span>
        </span>
      </button>
    </li>
  </ul>
</segmented-control>
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# Size small
render(Primer::Alpha::SegmentedControl.new("aria-label": "Billing duration", size: :small)) do |component|
  component.with_item(label: "Monthly")
  component.with_item(label: "Yearly", selected: true) do |button|
    button.with_trailing_visual_label(scheme: :accent) { "-8%" }
  end
end
# Size medium
render(Primer::Alpha::SegmentedControl.new("aria-label": "Billing duration", size: :medium)) do |component|
  component.with_item(label: "Monthly")
  component.with_item(label: "Yearly", selected: true) do |button|
    button.with_trailing_visual_label(scheme: :accent) { "-8%" }
  end
end
# Size large
render(Primer::Alpha::SegmentedControl.new("aria-label": "Billing duration", size: :large)) do |component|
  component.with_item(label: "Monthly")
  component.with_item(label: "Yearly", selected: true) do |button|
    button.with_trailing_visual_label(scheme: :accent) { "-8%" }
  end
end

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app/components/primer/alpha/segmented_control.css

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/* SegmentedControl */
.SegmentedControl {
  --segmentedControl-item-padding: var(--control-small-paddingBlock,0.25rem);
  display: inline-flex;
  list-style: none;
  background-color: var(--controlTrack-bgColor-rest, var(--color-segmented-control-bg));
  border-radius: var(--borderRadius-medium,0.375rem);
}
.SegmentedControl--iconOnly .Button--iconOnly.Button--small,
  .SegmentedControl--iconOnly .Button--iconOnly.Button--medium,
  .SegmentedControl--iconOnly .Button--iconOnly.Button--large {
    width: 100%;
    padding-inline: 0 !important;
  }
/* sizes */
.SegmentedControl--small {
  --segmentedControl-item-padding: var(--control-xsmall-paddingBlock,0.125rem);
}
.SegmentedControl--small .SegmentedControl-item {
    height: var(--control-small-size,1.75rem);
  }
.SegmentedControl--small .SegmentedControl-item .Button {
      padding-inline: calc(var(--control-xsmall-paddingInline-normal,0.5rem) - var(--segmentedControl-item-padding));
    }
.SegmentedControl--small.SegmentedControl--iconOnly .SegmentedControl-item {
      width: var(--control-small-size,1.75rem);
    }
.SegmentedControl--medium .SegmentedControl-item {
    height: var(--control-medium-size,2rem);
  }
.SegmentedControl--medium.SegmentedControl--iconOnly .SegmentedControl-item {
      width: var(--control-medium-size,2rem);
    }
.SegmentedControl--large .SegmentedControl-item {
    height: var(--control-large-size,2.5rem);
  }
.SegmentedControl--large .SegmentedControl-item .Button {
      padding-inline: calc(var(--control-large-paddingInline-normal,0.75rem) - var(--segmentedControl-item-padding));
    }
.SegmentedControl--large.SegmentedControl--iconOnly .SegmentedControl-item {
      width: var(--control-large-size,2.5rem);
    }
/* item */
.SegmentedControl-item {
  position: relative;
  display: inline-flex;
  justify-content: center;
  border: var(--borderWidth-thin,max(1px, 0.0625rem)) solid transparent;
  border-radius: var(--borderRadius-medium,0.375rem);
  height: var(--control-medium-size,2rem);
  padding: var(--segmentedControl-item-padding);
  /* button color overrides */
}
.SegmentedControl-item .Button--invisible:hover:not(:disabled) {
      background-color: var(--controlTrack-bgColor-hover, var(--color-action-list-item-default-hover-bg));
    }
.SegmentedControl-item .Button--invisible:active:not(:disabled) {
      background-color: var(--controlTrack-bgColor-active, var(--color-action-list-item-default-active-bg));
    }
/* Selected ---------------------------------------- */
.SegmentedControl-item.SegmentedControl-item--selected {
    background-color: var(--controlKnob-bgColor-rest, var(--color-segmented-control-button-bg));
    border-color: var(--controlKnob-borderColor-rest, var(--color-segmented-control-button-selected-border));
  }
.SegmentedControl-item.SegmentedControl-item--selected .Button {
      font-weight: var(--base-text-weight-semibold,600);
    }
.SegmentedControl-item.SegmentedControl-item--selected .Button:hover {
        background-color: transparent;
      }
.SegmentedControl-item.SegmentedControl-item--selected::before {
      border-color: transparent !important;
    }
.SegmentedControl-item.SegmentedControl-item--selected + .SegmentedControl-item::before {
      border-color: transparent;
    }
/* renders a visibly hidden "copy" of the text in bold, reserving box space for when text becomes bold on selected */
.SegmentedControl-item .Button-label[data-content]::before {
    display: block;
    height: 0;
    font-weight: var(--base-text-weight-semibold,600);
    visibility: hidden;
    content: attr(data-content);
  }
/* Separator lines */
.SegmentedControl-item:not(:first-child)::before {
      position: absolute;
      inset: 0 0 0 -1px;
      margin-top: var(--control-medium-paddingBlock,0.375rem);
      margin-bottom: var(--control-medium-paddingBlock,0.375rem);
      content: '';
      border-left: var(--borderWidth-thin,max(1px, 0.0625rem)) solid var(--borderColor-default,var(--color-border-default));
    }
/* Button ----------------------------------------- */
.SegmentedControl-item .Button {
    height: 100%;
    width: 100%;
    border: 0;
    font-weight: var(--base-text-weight-normal,400);
    border-radius: calc(var(--borderRadius-medium,0.375rem) - var(--segmentedControl-item-padding) / 2);
    padding-inline: calc(var(--control-medium-paddingInline-normal,0.75rem) - var(--segmentedControl-item-padding));
  }
.SegmentedControl-item .Button:focus-visible {
      outline-offset: calc(var(--segmentedControl-item-padding) - var(--borderWidth-thin,max(1px, 0.0625rem)));
      border-radius: calc(var(--borderRadius-medium,0.375rem) - var(--segmentedControl-item-padding) / 1);
    }
.SegmentedControl-item .Button--invisible.Button--invisible-noVisuals .Button-label {
    color: var(--button-default-fgColor-rest,var(--color-btn-text));
  }
/* fullWidth */
.SegmentedControl--fullWidth {
  display: flex;
}
.SegmentedControl--fullWidth .SegmentedControl-item {
    flex: 1;
    justify-content: center;
  }

app/components/primer/alpha/segmented_control.ts

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import {controller, targets} from '@github/catalyst'
@controller
class SegmentedControlElement extends HTMLElement {
  @targets items: HTMLElement[]
  connectedCallback() {
    this.#updateButtonLabels()
  }
  select(event: Event) {
    const button = event.currentTarget as HTMLButtonElement
    for (const item of this.items) {
      item.classList.remove('SegmentedControl-item--selected')
      item.querySelector('[aria-current]')?.setAttribute('aria-current', 'false')
    }
    button.closest('li.SegmentedControl-item')?.classList.add('SegmentedControl-item--selected')
    button.setAttribute('aria-current', 'true')
  }
  // Updates the button labels to have a data-content attribute with the text
  // This is for selection styling to avoid the text jumping. It only needs to be
  // setup when the component is first loaded.
  #updateButtonLabels() {
    for (const label of this.querySelectorAll('.Button-label')) {
      label.setAttribute('data-content', label.textContent || '')
    }
  }
}
declare global {
  interface Window {
    SegmentedControlElement: typeof SegmentedControlElement
  }
}
if (!window.customElements.get('segmented-control')) {
  window.SegmentedControlElement = SegmentedControlElement
  window.customElements.define('segmented-control', SegmentedControlElement)
}