1 files changed, 133 insertions, 0 deletions
diff --git a/toolkit/content/widgets/moz-toggle/moz-toggle.mjs b/toolkit/content/widgets/moz-toggle/moz-toggle.mjs
new file mode 100644
index 0000000000..be7ee98f34
--- /dev/null
+++ b/toolkit/content/widgets/moz-toggle/moz-toggle.mjs
@@ -0,0 +1,133 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at htp://mozilla.org/MPL/2.0/. */
+
+import { html, ifDefined } from "../vendor/lit.all.mjs";
+import { MozLitElement } from "../lit-utils.mjs";
+// eslint-disable-next-line import/no-unassigned-import
+import "chrome://global/content/elements/moz-label.mjs";
+
+/**
+ * A simple toggle element that can be used to switch between two states.
+ *
+ * @tagname moz-toggle
+ * @property {boolean} pressed - Whether or not the element is pressed.
+ * @property {boolean} disabled - Whether or not the element is disabled.
+ * @property {string} label - The label text.
+ * @property {string} description - The description text.
+ * @property {string} ariaLabel
+ *  The aria-label text for cases where there is no visible label.
+ * @slot support-link - Used to append a moz-support-link to the description.
+ * @fires toggle
+ *  Custom event indicating that the toggle's pressed state has changed.
+ */
+export default class MozToggle extends MozLitElement {
+  static shadowRootOptions = {
+    ...MozLitElement.shadowRootOptions,
+    delegatesFocus: true,
+  };
+
+  static properties = {
+    pressed: { type: Boolean, reflect: true },
+    disabled: { type: Boolean, reflect: true },
+    label: { type: String },
+    description: { type: String },
+    ariaLabel: { type: String, attribute: "aria-label" },
+    accessKey: { type: String, attribute: "accesskey" },
+  };
+
+  static get queries() {
+    return {
+      buttonEl: "#moz-toggle-button",
+      labelEl: "#moz-toggle-label",
+      descriptionEl: "#moz-toggle-description",
+    };
+  }
+
+  constructor() {
+    super();
+    this.pressed = false;
+    this.disabled = false;
+  }
+
+  handleClick() {
+    this.pressed = !this.pressed;
+    this.dispatchOnUpdateComplete(
+      new CustomEvent("toggle", {
+        bubbles: true,
+        composed: true,
+      })
+    );
+  }
+
+  // Delegate clicks on the host to the input element
+  click() {
+    this.buttonEl.click();
+  }
+
+  descriptionTemplate() {
+    if (this.description) {
+      return html`
+        <p
+          id="moz-toggle-description"
+          class="description-wrapper text-deemphasized"
+          part="description"
+        >
+          ${this.description} ${this.supportLinkTemplate()}
+        </p>
+      `;
+    }
+    return "";
+  }
+
+  supportLinkTemplate() {
+    return html` <slot name="support-link"></slot> `;
+  }
+
+  buttonTemplate() {
+    const { pressed, disabled, description, ariaLabel, handleClick } = this;
+    return html`
+      <button
+        id="moz-toggle-button"
+        part="button"
+        type="button"
+        class="toggle-button"
+        ?disabled=${disabled}
+        aria-pressed=${pressed}
+        aria-label=${ifDefined(ariaLabel ?? undefined)}
+        aria-describedby=${ifDefined(
+          description ? "moz-toggle-description" : undefined
+        )}
+        @click=${handleClick}
+      ></button>
+    `;
+  }
+
+  render() {
+    return html`
+      <link
+        rel="stylesheet"
+        href="chrome://global/content/elements/moz-toggle.css"
+      />
+      ${this.label
+        ? html`
+            <label
+              is="moz-label"
+              id="moz-toggle-label"
+              part="label"
+              for="moz-toggle-button"
+              accesskey=${ifDefined(this.accessKey)}
+            >
+              <span>
+                ${this.label}
+                ${!this.description ? this.supportLinkTemplate() : ""}
+              </span>
+              ${this.buttonTemplate()}
+            </label>
+          `
+        : this.buttonTemplate()}
+      ${this.descriptionTemplate()}
+    `;
+  }
+}
+customElements.define("moz-toggle", MozToggle);