UX: Misc desktop edits (#15)

javascripts/discourse/components/experimental-screen.gjs

@@ -0,0 +1,67 @@
+import Component from "@glimmer/component";
+import { tracked } from "@glimmer/tracking";
+import { action } from "@ember/object";
+import didInsert from "@ember/render-modifiers/modifiers/did-insert";
+import { cancel, throttle } from "@ember/runloop";
+import { htmlSafe } from "@ember/template";
+import { bind } from "discourse/lib/decorators";
+
+export default class ExperimentalScreen extends Component {
+  @tracked left = 0;
+  @tracked right = 0;
+
+  willDestroy() {
+    super.willDestroy(...arguments);
+    cancel(this._throttledCalculateDistanceHandler);
+  }
+
+  getDistance(element) {
+    const rect = element.getBoundingClientRect();
+    return rect;
+  }
+
+  @bind
+  calculateDistance() {
+    this._throttledCalculateDistanceHandler = throttle(
+      this,
+      this._throttledCalculateDistance,
+      50
+    );
+  }
+
+  _throttledCalculateDistance() {
+    const element = document.getElementById("main-outlet");
+
+    if (element) {
+      const distance = this.getDistance(element);
+      this.left = distance.left;
+      this.right = distance.right;
+    }
+  }
+
+  get distanceStyles() {
+    return htmlSafe(
+      `--left-distance: ${this.left}px; --right-distance: ${this.right}px;`
+    );
+  }
+
+  @action
+  onInsert() {
+    this.calculateDistance();
+    window.addEventListener("resize", this.calculateDistance);
+  }
+
+  <template>
+    <ul
+      class="experimental-screen"
+      {{didInsert this.onInsert}}
+      style={{this.distanceStyles}}
+    >
+      <li class="experimental-screen__top-left"></li>
+      <li class="experimental-screen__top-right"></li>
+      <li class="experimental-screen__bottom-left"></li>
+      <li class="experimental-screen__bottom-right"></li>
+      <li class="experimental-screen__bottom-bar"></li>
+    </ul>
+  </template>
+}