feat(core): add fullscreen button component (#459)

packages/html/src/ui/fullscreen-button/fullscreen-button-element.ts

@@ -0,0 +1,71 @@
+import type { PropertyValues } from '@lit/reactive-element';
+import { FullscreenButtonCore } from '@videojs/core';
+import {
+  applyElementProps,
+  applyStateDataAttrs,
+  createButton,
+  logMissingFeature,
+  selectFullscreen,
+} from '@videojs/core/dom';
+
+import { playerContext } from '../../player/context';
+import { PlayerController } from '../../player/player-controller';
+import { MediaElement } from '../media-element';
+
+export class FullscreenButtonElement extends MediaElement {
+  static readonly tagName = 'media-fullscreen-button';
+
+  static override properties = {
+    label: { type: String },
+    disabled: { type: Boolean },
+  };
+
+  label = '';
+  disabled = false;
+
+  readonly #core = new FullscreenButtonCore();
+  readonly #state = new PlayerController(this, playerContext, selectFullscreen);
+
+  #disconnect: AbortController | null = null;
+
+  override connectedCallback(): void {
+    super.connectedCallback();
+
+    this.#disconnect = new AbortController();
+
+    const buttonProps = createButton({
+      onActivate: () => this.#core.toggle(this.#state.value!),
+      isDisabled: () => this.disabled || !this.#state.value,
+    });
+
+    applyElementProps(this, buttonProps, this.#disconnect.signal);
+
+    if (!this.#state.value) {
+      logMissingFeature(FullscreenButtonElement.tagName, 'fullscreen');
+    }
+  }
+
+  override disconnectedCallback(): void {
+    super.disconnectedCallback();
+    this.#disconnect?.abort();
+    this.#disconnect = null;
+  }
+
+  protected override willUpdate(changed: PropertyValues): void {
+    super.willUpdate(changed);
+    this.#core.setProps(this);
+  }
+
+  protected override update(changed: PropertyValues): void {
+    super.update(changed);
+
+    const state = this.#state.value;
+
+    if (!state) {
+      return;
+    }
+
+    applyElementProps(this, this.#core.getAttrs(state));
+    applyStateDataAttrs(this, this.#core.getState(state));
+  }
+}