feat: override method with default interception behavior #663

docs/en/guide/override.md

@@ -6,7 +6,14 @@
 import Editor from "@hufe921/canvas-editor"
 
 const instance = new Editor(container, <IElement[]>data, options)
-instance.override.overrideFunction = ()=>{}
+
+instance.override.overrideFunction = () => void | Promise<void> | IOverrideResult | Promise<IOverrideResult>
+```
+
+```typescript
+interface IOverrideResult {
+  preventDefault?: boolean // Prevent the execution of internal default method. Default prevent
+}
 ```
 
 ## paste
@@ -16,7 +23,7 @@ Feature: Override internal paste function
 Usage:
 
 ```javascript
-instance.override.paste = (evt?: ClipboardEvent) => void
+instance.override.paste = (evt?: ClipboardEvent) => void | Promise<void> | IOverrideResult | Promise<IOverrideResult>
 ```
 
 ## copy
@@ -26,7 +33,7 @@ Feature: Override internal copy function
 Usage:
 
 ```javascript
-instance.override.copy = () => void
+instance.override.copy = () => void | Promise<void> | IOverrideResult | Promise<IOverrideResult>
 ```
 
 ## drop
@@ -36,5 +43,5 @@ Feature: Override internal drop function
 Usage:
 
 ```javascript
-instance.override.drop = (evt: DragEvent) => void
+instance.override.drop = (evt: DragEvent) => void | Promise<void> | IOverrideResult | Promise<IOverrideResult>
 ```