feat: rewrite public UI component rendering using tunnels (#6117)

* feat: rewrite public UI component rendering using tunnels

* factor out into components

* comments

* fix variable naming

* fix not hiding welcomeScreen

* factor out AppFooter and memoize components

* remove `UIOptions.welcomeScreen` and render only from host app

* factor out tunnels into own file

* update changelog. Keep `UIOptions.welcomeScreen` as deprecated

* update changelog

* lint

---------

Co-authored-by: Aakansha Doshi <aakansha1216@gmail.com>

src/excalidraw-app/components/AppFooter.tsx

@@ -0,0 +1,21 @@
+import React from "react";
+import { Footer } from "../../packages/excalidraw/index";
+import { EncryptedIcon } from "./EncryptedIcon";
+import { ExcalidrawPlusAppLink } from "./ExcalidrawPlusAppLink";
+
+export const AppFooter = React.memo(() => {
+  return (
+    <Footer>
+      <div
+        style={{
+          display: "flex",
+          gap: ".5rem",
+          alignItems: "center",
+        }}
+      >
+        <ExcalidrawPlusAppLink />
+        <EncryptedIcon />
+      </div>
+    </Footer>
+  );
+});

src/excalidraw-app/components/AppMainMenu.tsx

@@ -0,0 +1,40 @@
+import React from "react";
+import { PlusPromoIcon } from "../../components/icons";
+import { MainMenu } from "../../packages/excalidraw/index";
+import { LanguageList } from "./LanguageList";
+
+export const AppMainMenu: React.FC<{
+  setCollabDialogShown: (toggle: boolean) => any;
+  isCollaborating: boolean;
+}> = React.memo((props) => {
+  return (
+    <MainMenu>
+      <MainMenu.DefaultItems.LoadScene />
+      <MainMenu.DefaultItems.SaveToActiveFile />
+      <MainMenu.DefaultItems.Export />
+      <MainMenu.DefaultItems.SaveAsImage />
+      <MainMenu.DefaultItems.LiveCollaborationTrigger
+        isCollaborating={props.isCollaborating}
+        onSelect={() => props.setCollabDialogShown(true)}
+      />
+
+      <MainMenu.DefaultItems.Help />
+      <MainMenu.DefaultItems.ClearCanvas />
+      <MainMenu.Separator />
+      <MainMenu.ItemLink
+        icon={PlusPromoIcon}
+        href="https://plus.excalidraw.com/plus?utm_source=excalidraw&utm_medium=app&utm_content=hamburger"
+        className="ExcalidrawPlus"
+      >
+        Excalidraw+
+      </MainMenu.ItemLink>
+      <MainMenu.DefaultItems.Socials />
+      <MainMenu.Separator />
+      <MainMenu.DefaultItems.ToggleTheme />
+      <MainMenu.ItemCustom>
+        <LanguageList style={{ width: "100%" }} />
+      </MainMenu.ItemCustom>
+      <MainMenu.DefaultItems.ChangeCanvasBackground />
+    </MainMenu>
+  );
+});

src/excalidraw-app/components/AppWelcomeScreen.tsx

@@ -0,0 +1,64 @@
+import React from "react";
+import { PlusPromoIcon } from "../../components/icons";
+import { t } from "../../i18n";
+import { WelcomeScreen } from "../../packages/excalidraw/index";
+import { isExcalidrawPlusSignedUser } from "../app_constants";
+
+export const AppWelcomeScreen: React.FC<{
+  setCollabDialogShown: (toggle: boolean) => any;
+}> = React.memo((props) => {
+  let headingContent;
+
+  if (isExcalidrawPlusSignedUser) {
+    headingContent = t("welcomeScreen.app.center_heading_plus")
+      .split(/(Excalidraw\+)/)
+      .map((bit, idx) => {
+        if (bit === "Excalidraw+") {
+          return (
+            <a
+              style={{ pointerEvents: "all" }}
+              href={`${process.env.REACT_APP_PLUS_APP}?utm_source=excalidraw&utm_medium=app&utm_content=welcomeScreenSignedInUser`}
+              key={idx}
+            >
+              Excalidraw+
+            </a>
+          );
+        }
+        return bit;
+      });
+  } else {
+    headingContent = t("welcomeScreen.app.center_heading");
+  }
+
+  return (
+    <WelcomeScreen>
+      <WelcomeScreen.Hints.MenuHint>
+        {t("welcomeScreen.app.menuHint")}
+      </WelcomeScreen.Hints.MenuHint>
+      <WelcomeScreen.Hints.ToolbarHint />
+      <WelcomeScreen.Hints.HelpHint />
+      <WelcomeScreen.Center>
+        <WelcomeScreen.Center.Logo />
+        <WelcomeScreen.Center.Heading>
+          {headingContent}
+        </WelcomeScreen.Center.Heading>
+        <WelcomeScreen.Center.Menu>
+          <WelcomeScreen.Center.MenuItemLoadScene />
+          <WelcomeScreen.Center.MenuItemHelp />
+          <WelcomeScreen.Center.MenuItemLiveCollaborationTrigger
+            onSelect={() => props.setCollabDialogShown(true)}
+          />
+          {!isExcalidrawPlusSignedUser && (
+            <WelcomeScreen.Center.MenuItemLink
+              href="https://plus.excalidraw.com/plus?utm_source=excalidraw&utm_medium=app&utm_content=welcomeScreenGuest"
+              shortcut={null}
+              icon={PlusPromoIcon}
+            >
+              Try Excalidraw Plus!
+            </WelcomeScreen.Center.MenuItemLink>
+          )}
+        </WelcomeScreen.Center.Menu>
+      </WelcomeScreen.Center>
+    </WelcomeScreen>
+  );
+});