➕ fix https://github.com/siyuan-note/siyuan/issues/9452

app/src/plugin/EventBus.ts

@@ -20,7 +20,7 @@ export class EventBus<DetailType = any> {
     }
 
     emit(type: TEventBus, detail?: DetailType) {
-        return this.eventTarget.dispatchEvent(new CustomEvent(type, {detail}));
+        return this.eventTarget.dispatchEvent(new CustomEvent(type, {detail, cancelable: true}));
     }
 }
 

app/src/protyle/util/paste.ts

@@ -125,10 +125,10 @@ export const pasteText = (protyle: IProtyle, textPlain: string, nodeElement: Ele
 export const paste = async (protyle: IProtyle, event: (ClipboardEvent | DragEvent) & { target: HTMLElement }) => {
     event.stopPropagation();
     event.preventDefault();
-    let textHTML;
-    let textPlain;
-    let siyuanHTML;
-    let files;
+    let textHTML: string;
+    let textPlain: string;
+    let siyuanHTML: string;
+    let files: FileList | DataTransferItemList;
     if ("clipboardData" in event) {
         textHTML = event.clipboardData.getData("text/html");
         textPlain = event.clipboardData.getData("text/plain");
@@ -194,6 +194,37 @@ export const paste = async (protyle: IProtyle, event: (ClipboardEvent | DragEven
         textHTML = Lute.Sanitize(textHTML);
     }
 
+    if (protyle && protyle.app && protyle.app.plugins) {
+        for (let i = 0; i < protyle.app.plugins.length; i++) {
+            const response: IObject & { files: FileList } = await new Promise((resolve) => {
+                const emitResult = protyle.app.plugins[i].eventBus.emit("paste", {
+                    protyle,
+                    resolve,
+                    textHTML,
+                    textPlain,
+                    siyuanHTML,
+                    files
+                });
+                if (emitResult) {
+                    resolve(undefined);
+                }
+            });
+
+            if (response?.textHTML) {
+                textHTML = response.textHTML;
+            }
+            if (response?.textPlain) {
+                textPlain = response.textPlain;
+            }
+            if (response?.siyuanHTML) {
+                siyuanHTML = response.siyuanHTML;
+            }
+            if (response?.files) {
+                files = response.files as FileList;
+            }
+        }
+    }
+
     const nodeElement = hasClosestBlock(event.target);
     if (!nodeElement) {
         if (files && files.length > 0) {

app/src/types/index.d.ts

@@ -49,6 +49,7 @@ type TEventBus = "ws-main" |
     "open-menu-blockref" | "open-menu-fileannotationref" | "open-menu-tag" | "open-menu-link" | "open-menu-image" |
     "open-menu-av" | "open-menu-content" | "open-menu-breadcrumbmore" | "open-menu-doctree" |
     "open-siyuan-url-plugin" | "open-siyuan-url-block" |
+    "paste" |
     "input-search" |
     "loaded-protyle" | "loaded-protyle-dynamic" |
     "destroy-protyle"