From ff304c620c947129b4d3313492db2c71c69ee87f Mon Sep 17 00:00:00 2001
From: Reimar <mail@reim.ar>
Date: Wed, 15 Oct 2025 09:34:02 +0200
Subject: [PATCH] implement file dropping

---
 src/index.js                | 26 +++++++++++++++++++++++++-
 src/project_save_handler.js | 31 +++++++++++++++++++------------
 style.css                   |  4 ++++
 3 files changed, 48 insertions(+), 13 deletions(-)

diff --git a/src/index.js b/src/index.js
index 071161c..decd921 100644
--- a/src/index.js
+++ b/src/index.js
@@ -62,6 +62,7 @@ const projectName = document.querySelector("#project-name");
 const saveButton = document.querySelector("#save-button");
 const loadButton = document.querySelector("#load-button");
 const exportButton = document.querySelector("#export-button");
+const dropZone = document.querySelector("main");
 
 const projectSaveHandler = new ProjectSaveHandler(editor, assetEditor, assetProvider, projectName);
 
@@ -105,7 +106,7 @@ exportButton.onclick = async () => {
 };
 
 loadButton.onclick = () => {
-    projectSaveHandler.loadFromFile();
+    projectSaveHandler.showLoadFilePrompt();
 };
 
 saveButton.onclick = () => {
@@ -120,3 +121,26 @@ addEventListener("keydown", (ev) => {
 });
 
 toggleAssetEditorButton.addEventListener("click", () => assetEditor.toggleEditor());
+
+window.ondragover = (ev) => ev.preventDefault();
+window.ondrop = (ev) => ev.preventDefault();
+
+dropZone.onclick = (ev) => ev.preventDefault();
+dropZone.ondragover = (ev) => ev.preventDefault();
+dropZone.ondrop = async (ev) => {
+    for (const file of ev.dataTransfer.files) {
+        if (file.name.endsWith(".karlkode")) {
+            await projectSaveHandler.loadFromFile(file);
+            continue;
+        }
+
+        if (file.type.startsWith("image/")) {
+            await assetEditor.addAsset({ name: file.name, file });
+            continue;
+        }
+
+        alert("Invalid file: " + file.name);
+    }
+
+    ev.preventDefault();
+};
diff --git a/src/project_save_handler.js b/src/project_save_handler.js
index 812ff07..9457dd8 100644
--- a/src/project_save_handler.js
+++ b/src/project_save_handler.js
@@ -1,6 +1,7 @@
 import { promptUpload } from "./prompt_upload.js";
 import { downloadFile, slugify } from "./utils.js";
 import { HtmlExporter } from "./html_exporter.js";
+import { KarlkoderCodec } from "./karlkoder_codec.js";
 
 export class ProjectSaveHandler {
     constructor(editor, assetEditor, assetProvider, projectName) {
@@ -22,16 +23,7 @@ export class ProjectSaveHandler {
         });
     }
 
-    async loadFromFile() {
-        if (
-            !this.isSaved &&
-            !confirm(
-                "Your project has not been saved. Loading a new project will override your current one. Continue?",
-            )
-        ) {
-            return;
-        }
-
+    async showLoadFilePrompt() {
         const files = await promptUpload(".karlkode", false);
         if (files.length === 0) {
             return;
@@ -43,8 +35,21 @@ export class ProjectSaveHandler {
             );
         }
 
+        this.loadFromFile(files[0]);
+    }
+
+    async loadFromFile(file) {
+        if (
+            !this.isSaved &&
+            !confirm(
+                "Your project has not been saved. Loading a new project will override your current one. Continue?",
+            )
+        ) {
+            return;
+        }
+
         const items = KarlkoderCodec.de(
-            await fetch(URL.createObjectURL(files[0])).then((x) => x.bytes()),
+            await fetch(URL.createObjectURL(file)).then((x) => x.bytes()),
         );
 
         const assets = items
@@ -57,7 +62,7 @@ export class ProjectSaveHandler {
         const code = items.find((x) => x.tag === "code");
         delete code.tag;
 
-        assetEditor.importAssets(
+        this.assetEditor.importAssets(
             assets.map(({ name, mime, content }) => {
                 const file = new File([content], name, { type: mime });
 
@@ -68,6 +73,8 @@ export class ProjectSaveHandler {
         this.projectName.value = code.name;
         const dec = new TextDecoder();
         this.editor.setValue(dec.decode(code.content));
+
+        this.isSaved = true;
     }
 
     async saveFile() {
diff --git a/style.css b/style.css
index 7fb4849..4830bab 100644
--- a/style.css
+++ b/style.css
@@ -24,6 +24,10 @@ main {
     gap: 2rem;
 }
 
+#file-drop-input {
+    display: none;
+}
+
 .section-header {
     background-color: #bdbdbd;
     border-top-left-radius: 0.5rem;