Copy and Paste Lists

api/feature.js

@@ -90,6 +90,9 @@ class Feature {
 
       return element[reactKey]
     }
+    this.getInternalKey = function(element) {
+      return Object.keys(element).find((key) => key.startsWith("__reactInternalInstance")) || null
+    }
     this.redux = document.querySelector("#app")?.[
         Object.keys(app).find((key) => key.startsWith("__reactContainer"))
       ].child.stateNode.store

features/copy-paste-lists/data.json

@@ -0,0 +1,15 @@
+{
+  "title": "Copy and Paste Lists",
+  "description": "Allows you to right-click on lists on the stage to copy and paste large amounts of items.",
+  "credits": [
+    {
+      "username": "Brass_Glass",
+      "url": "https://scratch.mit.edu/users/Brass_Glass/"
+    },
+    { "username": "rgantzos", "url": "https://scratch.mit.edu/users/rgantzos/" }
+  ],
+  "type": ["Editor"],
+  "tags": ["New", "Featured"],
+  "dynamic": true,
+  "scripts": [{ "file": "script.js", "runOn": "/projects/*" }]
+}

features/copy-paste-lists/script.js

@@ -0,0 +1,156 @@
+export default async function ({ feature, console, scratchClass }) {
+  document.body.addEventListener("contextmenu", async (event) => {
+    const ctxTarget = event.target.closest(
+      ".react-contextmenu-wrapper, [data-state]"
+    );
+    if (!ctxTarget) return;
+    const ctx = feature.getInternals(ctxTarget);
+
+    if (!ctx) return;
+
+    const listCtx = findParentWithProp(ctx, "opcode");
+    if (listCtx && listCtx.props.id) {
+      let listId = listCtx.props.id;
+
+      let stage = feature.traps.vm.runtime.getTargetForStage();
+      let list = stage.lookupVariableById(listId);
+
+      if (list.type !== "list") return;
+
+      const menuInternal =
+        feature.getInternals(ctxTarget).return.stateNode.props.id;
+      if (!menuInternal) return;
+
+      let menus = document.querySelectorAll("body > nav.react-contextmenu");
+
+      let menu = Array.prototype.find.call(menus, (pMenu) => {
+        const menuInternals = feature.getInternals(pMenu);
+        return menuInternals?.return?.stateNode?.props?.id === menuInternal;
+      });
+
+      if (menu.querySelector(".ste-copy-paste-list")) return;
+
+      menu.prepend(
+        optionBuilder("paste", async function () {
+          try {
+            let text = await getClipboardWithContextMenu();
+            if (text) {
+              let newItems = text.split("\n");
+
+              if (
+                confirm(
+                  `Are you sure you want to add ${newItems.length} item${
+                    newItems.length === 1 ? "s" : ""
+                  } to your "${
+                    stage.lookupVariableById(listId).name
+                  }" list? This will clear all existing items.`
+                )
+              ) {
+                stage.lookupVariableById(listId).value = newItems || [];
+
+                updateList(listId);
+
+                alert(
+                  `Successfully pasted ${newItems.length} items to your "${
+                    stage.lookupVariableById(listId).name
+                  }" list!`
+                );
+              }
+            } else {
+              alert("Oops! You don't have anything copied!");
+            }
+          } catch (err) {
+            alert("Oops! Something went wrong.");
+          }
+          closeContextMenu();
+        })
+      );
+
+      menu.prepend(
+        optionBuilder("copy", async function () {
+          let text = stage.lookupVariableById(listId).value.join("\n");
+          await navigator.clipboard.writeText(text);
+          closeContextMenu();
+        })
+      );
+
+      window.menu = menu;
+    }
+
+    function updateList(id) {
+      feature.traps.vm.runtime.requestUpdateMonitor(
+        new Map([
+          ["id", id],
+          ["x", Date.now()],
+          ["y", 0],
+        ])
+      );
+    }
+
+    function closeContextMenu() {
+      const clickEvent = new MouseEvent("mousedown", {
+        bubbles: true,
+        cancelable: true,
+        view: window,
+      });
+
+      document.body.dispatchEvent(clickEvent);
+    }
+
+    function optionBuilder(text, callback) {
+      let div = document.createElement("div");
+      div.classList.add("react-contextmenu-item");
+      div.classList.add(scratchClass("context-menu_menu-item_"));
+      div.classList.add("ste-copy-paste-list");
+
+      feature.self.hideOnDisable(div);
+
+      div.addEventListener("click", callback);
+
+      div.role = "menuitem";
+      div.tabIndex = "-1";
+      div.ariaDisabled = false;
+
+      let span = document.createElement("span");
+      span.textContent = text;
+      div.appendChild(span);
+
+      return div;
+    }
+
+    async function getClipboardWithContextMenu() {
+      const input = document.createElement("input");
+      input.style.position = "absolute";
+      input.style.opacity = "0";
+      document.body.appendChild(input);
+
+      input.focus();
+
+      try {
+        const text = await navigator.clipboard.readText();
+        return text;
+      } catch (err) {
+        console.log("Failed to read clipboard:", err);
+      } finally {
+        document.body.removeChild(input);
+      }
+    }
+
+    // Credit to @mxmou on GitHub for findParentWithProp
+
+    function findParentWithProp(reactInternalInstance, prop) {
+      if (!reactInternalInstance) return null;
+      while (
+        !reactInternalInstance.stateNode?.props ||
+        !Object.prototype.hasOwnProperty.call(
+          reactInternalInstance.stateNode.props,
+          prop
+        )
+      ) {
+        if (!reactInternalInstance.return) return null;
+        reactInternalInstance = reactInternalInstance.return;
+      }
+      return reactInternalInstance.stateNode;
+    }
+  });
+}

features/features.json

@@ -1,4 +1,9 @@
 [
+  {
+    "version": 2,
+    "id": "copy-paste-lists",
+    "versionAdded": "v4.2.0"
+  },
   {
     "version": 2,
     "id": "random-block-colors",