From 770eb99a30e884d4eef8acdcd6556f2e91df7aee Mon Sep 17 00:00:00 2001
From: codetorso <pruthvirajthinks@gmail.com>
Date: Tue, 18 Jun 2024 23:46:14 -0600
Subject: Drag and Drop in Canvas!

---
 apps/web/app/(canvas)/canvas.tsx          | 79 ++++++++++++++++++++++++-------
 apps/web/app/(canvas)/dropComponent.tsx   | 76 +++++++++++++++++++++++++++++
 apps/web/app/(canvas)/enabledComp.tsx     |  2 +-
 apps/web/app/(canvas)/lib/context.tsx     | 11 +++++
 apps/web/app/(canvas)/lib/createEmbeds.ts | 36 +++++++++++++-
 5 files changed, 185 insertions(+), 19 deletions(-)
 create mode 100644 apps/web/app/(canvas)/dropComponent.tsx
 create mode 100644 apps/web/app/(canvas)/lib/context.tsx

(limited to 'apps/web/app')

diff --git a/apps/web/app/(canvas)/canvas.tsx b/apps/web/app/(canvas)/canvas.tsx
index 9ec57d6d..498ab1eb 100644
--- a/apps/web/app/(canvas)/canvas.tsx
+++ b/apps/web/app/(canvas)/canvas.tsx
@@ -1,4 +1,4 @@
-import { useCallback, useEffect, useMemo, useState } from "react";
+import { useCallback, useEffect, useMemo, useRef, useState } from "react";
 import { Editor, Tldraw, setUserPreferences, TLStoreWithStatus } from "tldraw";
 import { createAssetFromUrl } from "./lib/createAssetUrl";
 import "tldraw/tldraw.css";
@@ -7,10 +7,53 @@ import { twitterCardUtil } from "./twitterCard";
 import createEmbedsFromUrl from "./lib/createEmbeds";
 import { loadRemoteSnapshot } from "./lib/loadSnap";
 import { SaveStatus } from "./savesnap";
-import { getAssetUrls } from '@tldraw/assets/selfHosted'
-import { memo } from 'react';
+import { getAssetUrls } from "@tldraw/assets/selfHosted";
+import { memo } from "react";
+import DragContext from "./lib/context";
+import DropZone from "./dropComponent";
 
-export const Canvas = memo(()=>{
+export const Canvas = memo(() => {
+  const [isDraggingOver, setIsDraggingOver] = useState<boolean>(false);
+  const Dragref = useRef<HTMLDivElement | null>(null)
+
+  const handleDragOver = (event: any) => {
+    event.preventDefault();
+    setIsDraggingOver(true);
+    console.log("entere")
+  };
+
+  const handleDragLeave = () => {
+    setIsDraggingOver(false);
+    console.log("leaver")
+  };
+
+  useEffect(() => {
+    const divElement = Dragref.current;
+    if (divElement) {
+      divElement.addEventListener('dragover', handleDragOver);
+      divElement.addEventListener('dragleave', handleDragLeave);  
+    }
+    return () => {
+      if (divElement) {
+        divElement.removeEventListener('dragover', handleDragOver);
+        divElement.removeEventListener('dragleave', handleDragLeave);  
+      }
+    };
+  }, []);
+
+  return (
+    <DragContext.Provider value={{ isDraggingOver, setIsDraggingOver }}>
+    <div
+      ref={Dragref}
+      className="w-full h-full"
+    >
+      <TldrawComponent />
+    </div>
+    </DragContext.Provider>
+  );
+});
+
+const TldrawComponent =memo(() => {
   const [storeWithStatus, setStoreWithStatus] = useState<TLStoreWithStatus>({
     status: "loading",
   });
@@ -38,18 +81,22 @@ export const Canvas = memo(()=>{
 
   setUserPreferences({ id: "supermemory", isDarkMode: true });
 
-  const assetUrls = getAssetUrls()
+  const assetUrls = getAssetUrls();
   return (
-    <Tldraw
-      assetUrls={assetUrls}
-      components={components}
-      store={storeWithStatus}
-      shapeUtils={[twitterCardUtil]}
-      onMount={handleMount}
-    >
-      <div className="absolute left-1/2 top-0 z-[1000000] flex -translate-x-1/2 gap-2 bg-[#2C3439] text-[#B3BCC5]">
-        <SaveStatus />
-      </div>
-    </Tldraw>
+    <div className="w-full h-full">
+      <Tldraw
+        className="relative"
+        assetUrls={assetUrls}
+        components={components}
+        store={storeWithStatus}
+        shapeUtils={[twitterCardUtil]}
+        onMount={handleMount}
+      >
+        <div className="absolute left-1/2 top-0 z-[1000000] flex -translate-x-1/2 gap-2 bg-[#2C3439] text-[#B3BCC5]">
+          <SaveStatus />
+        </div>
+        <DropZone />
+      </Tldraw>
+    </div>
   );
 })
diff --git a/apps/web/app/(canvas)/dropComponent.tsx b/apps/web/app/(canvas)/dropComponent.tsx
new file mode 100644
index 00000000..03a32358
--- /dev/null
+++ b/apps/web/app/(canvas)/dropComponent.tsx
@@ -0,0 +1,76 @@
+import React, { useRef, useCallback, useEffect, useContext } from "react";
+import { useEditor } from "tldraw";
+import DragContext, { DragContextType } from "./lib/context";
+import { handleExternalDroppedContent } from "./lib/createEmbeds";
+
+const stripHtmlTags = (html: string): string => {
+  const div = document.createElement("div");
+  div.innerHTML = html;
+  return div.textContent || div.innerText || "";
+};
+
+const useDrag = (): DragContextType => {
+  const context = useContext(DragContext);
+  if (!context) {
+    throw new Error('useCounter must be used within a CounterProvider');
+  }
+  return context;
+};
+
+
+function DropZone() {
+  const dropRef = useRef<HTMLDivElement | null>(null);
+  const {isDraggingOver, setIsDraggingOver} = useDrag();
+
+  const editor = useEditor();
+
+  const handleDrop = useCallback((event: React.DragEvent<HTMLDivElement>) => {
+    event.preventDefault();
+    setIsDraggingOver(false);
+    const dt = event.dataTransfer;
+    const items = dt.items;
+
+    for (let i = 0; i < items.length; i++) {
+      if (items[i]!.kind === "file" && items[i]!.type.startsWith("image/")) {
+        const file = items[i]!.getAsFile();
+        if (file) {
+          const reader = new FileReader();
+          reader.onload = (e) => {
+            if (e.target) {
+              // setDroppedImage(e.target.result as string);
+            }
+          };
+          reader.readAsDataURL(file);
+        }
+      } else if (items[i]!.kind === "string") {
+        items[i]!.getAsString((data) => {
+          const cleanText = stripHtmlTags(data);
+          handleExternalDroppedContent({editor,text:cleanText})
+        });
+      }
+    }
+  }, []);
+
+  useEffect(() => {
+    const divElement = dropRef.current;
+    if (divElement) {
+      // @ts-ignore
+      divElement.addEventListener("drop", handleDrop);
+    }
+    return () => {
+      if (divElement) {
+        // @ts-ignore
+        divElement.removeEventListener("drop", handleDrop);
+      }
+    };
+  }, []);
+
+  return (
+    <div
+      className={`h-full w-full absolute top-0 left-0 z-[100000] pointer-events-none  ${isDraggingOver && "bg-[#2C3439]  pointer-events-auto"}`}
+      ref={dropRef}
+    ></div>
+  );
+}
+
+export default DropZone;
diff --git a/apps/web/app/(canvas)/enabledComp.tsx b/apps/web/app/(canvas)/enabledComp.tsx
index 5dbe6ee7..85811b82 100644
--- a/apps/web/app/(canvas)/enabledComp.tsx
+++ b/apps/web/app/(canvas)/enabledComp.tsx
@@ -7,12 +7,12 @@ export const components: Partial<TLUiComponents> = {
   TopPanel: null,
   DebugPanel: null,
   DebugMenu: null,
+  PageMenu: null,
   // Minimap: null,
   // ContextMenu: null,
   // HelpMenu: null,
   // ZoomMenu: null,
   // StylePanel: null,
-  // PageMenu: null,
   // NavigationPanel: null,
   // Toolbar: null,
   // KeyboardShortcutsDialog: null,
diff --git a/apps/web/app/(canvas)/lib/context.tsx b/apps/web/app/(canvas)/lib/context.tsx
new file mode 100644
index 00000000..36a106cf
--- /dev/null
+++ b/apps/web/app/(canvas)/lib/context.tsx
@@ -0,0 +1,11 @@
+import { createContext } from 'react';
+
+export interface DragContextType {
+  isDraggingOver: boolean;
+  setIsDraggingOver: React.Dispatch<React.SetStateAction<boolean>>;
+}
+
+
+const DragContext = createContext<DragContextType | undefined>(undefined);
+
+export default DragContext;
\ No newline at end of file
diff --git a/apps/web/app/(canvas)/lib/createEmbeds.ts b/apps/web/app/(canvas)/lib/createEmbeds.ts
index 53d81533..0db3c71b 100644
--- a/apps/web/app/(canvas)/lib/createEmbeds.ts
+++ b/apps/web/app/(canvas)/lib/createEmbeds.ts
@@ -2,8 +2,8 @@ import { AssetRecordType, Editor, TLAsset, TLAssetId, TLBookmarkShape, TLExterna
 
 export default async function createEmbedsFromUrl({url, point, sources, editor}: {
   url: string
-  point: VecLike | undefined
-  sources: TLExternalContentSource[] | undefined
+  point?: VecLike | undefined
+  sources?: TLExternalContentSource[] | undefined
   editor: Editor
 }){
 
@@ -87,6 +87,38 @@ export default async function createEmbedsFromUrl({url, point, sources, editor}:
     });
 }
 
+function isURL(str: string) {
+  try {
+    new URL(str);
+    return true;
+  } catch {
+    return false;
+  }
+}
+
+
+export function handleExternalDroppedContent({text, editor}: {text:string, editor: Editor}){
+  const position = editor.inputs.shiftKey
+  ? editor.inputs.currentPagePoint
+  : editor.getViewportPageBounds().center;
+
+  if (isURL(text)){
+    createEmbedsFromUrl({editor, url: text})
+  } else{
+    editor.createShape({
+      type: "text",
+      x: position.x - 75,
+      y: position.y - 75,
+      props: {
+        text: text,
+        size: "s",
+        textAlign: "start",
+      },
+    });
+
+  }
+}
+
 function centerSelectionAroundPoint(editor: Editor, position: VecLike) {
 	// Re-position shapes so that the center of the group is at the provided point
 	const viewportPageBounds = editor.getViewportPageBounds()
-- 
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