Context menu with some commands (#217)

src/components/ContextMenu.tsx

@@ -0,0 +1,85 @@
+import React from "react";
+import { Popover } from "./Popover";
+import { render, unmountComponentAtNode } from "react-dom";
+
+import "./ContextMenu.css";
+
+type ContextMenuOption = {
+  label: string;
+  action(): void;
+};
+
+type Props = {
+  options: ContextMenuOption[];
+  onCloseRequest?(): void;
+  top: number;
+  left: number;
+};
+
+function ContextMenu({ options, onCloseRequest, top, left }: Props) {
+  return (
+    <Popover onCloseRequest={onCloseRequest} top={top} left={left}>
+      <ul className="context-menu" onContextMenu={e => e.preventDefault()}>
+        {options.map((option, idx) => (
+          <li
+            key={idx}
+            className="context-menu__option"
+            onClick={onCloseRequest}
+          >
+            <ContextMenuOption {...option} />
+          </li>
+        ))}
+      </ul>
+    </Popover>
+  );
+}
+
+function ContextMenuOption({ label, action }: ContextMenuOption) {
+  return (
+    <button className="context-menu-option" onClick={action}>
+      {label}
+    </button>
+  );
+}
+
+let contextMenuNode: HTMLDivElement;
+function getContextMenuNode(): HTMLDivElement {
+  if (contextMenuNode) {
+    return contextMenuNode;
+  }
+  const div = document.createElement("div");
+  document.body.appendChild(div);
+  return (contextMenuNode = div);
+}
+
+type ContextMenuParams = {
+  options: (ContextMenuOption | false | null | undefined)[];
+  top: number;
+  left: number;
+};
+
+function handleClose() {
+  unmountComponentAtNode(getContextMenuNode());
+}
+
+export default {
+  push(params: ContextMenuParams) {
+    const options = Array.of<ContextMenuOption>();
+    params.options.forEach(option => {
+      if (option) {
+        options.push(option);
+      }
+    });
+    if (options.length) {
+      render(
+        <ContextMenu
+          top={params.top}
+          left={params.left}
+          options={options}
+          onCloseRequest={handleClose}
+        />,
+        getContextMenuNode()
+      );
+    }
+  }
+};