fix: polyfills and media (#135)

Author: herefishyfish

packages/canvas-media/video/index.android.ts

@@ -89,7 +89,7 @@ export class Video extends VideoBase {
 	getCurrentFrame(context?: WebGLRenderingContext) {
 		const ctx = arguments[1] as any;
 		const flipY = ctx._flipY;
-		const ptr = ctx._canvas._canvas.getNativeGL();
+		const ptr = ctx._canvas._canvas.getNativeContext();
 
 		this._instance.getCurrentFrame(!!this.isLoaded, ptr, flipY, arguments[4], arguments[5]);
 	}

packages/canvas-polyfill/DOM/EventTarget.ts

@@ -49,7 +49,13 @@ export class EventTarget {
 		}
 	}
 
-	dispatchEvent(event) {
+	/**
+	 * Dispatches an event to this EventTarget.
+	 * https://developer.mozilla.org/en-US/docs/Web/API/EventTarget/dispatchEvent
+	 * @param event
+	 * @returns false if event is cancelable, and at least one of the event handlers which received event called Event.preventDefault(). Otherwise true.
+	 */
+	dispatchEvent(event): boolean {
 		let emitter: Observable;
 
 		if (global.isAndroid) {
@@ -63,5 +69,7 @@ export class EventTarget {
 		if (emitter !== null && emitter !== undefined) {
 			emitter.notify({ ...event, eventName: event.type, object: emitter });
 		}
+
+		return !event?.defaultPrevented;
 	}
 }

packages/canvas-polyfill/index.ts

@@ -1,4 +1,4 @@
-require('globals');
+require('@nativescript/core/globals');
 
 if (__ANDROID__ && !(global as any).__canvasLoaded) {
 	try {

packages/canvas/Canvas/common.ts

@@ -73,6 +73,15 @@ export class Event {
 	}
 }
 
+export class CustomEvent extends Event {
+	detail: any;
+
+	constructor(type: string, options?: EventOptions & { detail?: any }) {
+		super(type, options);
+		this.detail = options?.detail ?? null;
+	}
+}
+
 interface UIEventOptions extends EventOptions {
 	detail?: number;
 	view?: any;