Catalog render optimizations (#3422)

src/renderer/components/render-delay/__tests__/render-delay.test.tsx

@@ -0,0 +1,38 @@
+/**
+ * Copyright (c) 2021 OpenLens Authors
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+ * the Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+ * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+import React from "react";
+import "@testing-library/jest-dom/extend-expect";
+import { render } from "@testing-library/react";
+import { RenderDelay } from "../render-delay";
+
+describe("<RenderDelay/>", () => {
+  it("renders w/o errors", () => {
+    const { container } = render(<RenderDelay><button>My button</button></RenderDelay>);
+
+    expect(container).toBeInstanceOf(HTMLElement);
+  });
+
+  it("renders it's child", () => {
+    const { getByText } = render(<RenderDelay><button>My button</button></RenderDelay>);
+
+    expect(getByText("My button")).toBeInTheDocument();
+  });
+});

src/renderer/components/render-delay/render-delay.tsx

@@ -0,0 +1,63 @@
+/**
+ * Copyright (c) 2021 OpenLens Authors
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+ * the Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+ * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+import React from "react";
+import { makeObservable, observable } from "mobx";
+import { observer } from "mobx-react";
+import { boundMethod } from "../../utils";
+
+interface Props {
+  placeholder?: React.ReactNode;
+  children: unknown;
+}
+
+@observer
+export class RenderDelay extends React.Component<Props> {
+  @observable isVisible = false;
+
+  constructor(props: Props) {
+    super(props);
+    makeObservable(this);
+  }
+
+  componentDidMount() {
+    const guaranteedFireTime = 1000;
+
+    window.requestIdleCallback(this.showContents, { timeout: guaranteedFireTime });
+  }
+
+  componentWillUnmount() {
+    window.cancelIdleCallback(this.showContents);
+  }
+
+  @boundMethod
+  showContents() {
+    this.isVisible = true;
+  }
+
+  render() {
+    if (!this.isVisible) {
+      return this.props.placeholder || null;
+    }
+
+    return this.props.children;
+  }
+}