feat: Add onStarted and onStopped events (#2273)

* feat: Add `onStarted` and `onStopped` events

* Implement `onStart` for Android

* Update CameraSession.kt

* Update CameraSessionDelegate.swift

package/ios/CameraView.swift

@@ -59,6 +59,8 @@ public final class CameraView: UIView, CameraSessionDelegate {
   // events
   @objc var onInitialized: RCTDirectEventBlock?
   @objc var onError: RCTDirectEventBlock?
+  @objc var onStarted: RCTDirectEventBlock?
+  @objc var onStopped: RCTDirectEventBlock?
   @objc var onViewReady: RCTDirectEventBlock?
   @objc var onCodeScanned: RCTDirectEventBlock?
   // zoom
@@ -283,7 +285,23 @@ public final class CameraView: UIView, CameraSessionDelegate {
     guard let onInitialized = onInitialized else {
       return
     }
-    onInitialized([String: Any]())
+    onInitialized([:])
+  }
+
+  func onCameraStarted() {
+    ReactLogger.log(level: .info, message: "Camera started!")
+    guard let onStarted = onStarted else {
+      return
+    }
+    onStarted([:])
+  }
+
+  func onCameraStopped() {
+    ReactLogger.log(level: .info, message: "Camera stopped!")
+    guard let onStopped = onStopped else {
+      return
+    }
+    onStopped([:])
   }
 
   func onFrame(sampleBuffer: CMSampleBuffer) {

package/ios/CameraViewManager.m

@@ -52,6 +52,8 @@ RCT_EXPORT_VIEW_PROPERTY(resizeMode, NSString);
 // Camera View Events
 RCT_EXPORT_VIEW_PROPERTY(onError, RCTDirectEventBlock);
 RCT_EXPORT_VIEW_PROPERTY(onInitialized, RCTDirectEventBlock);
+RCT_EXPORT_VIEW_PROPERTY(onStarted, RCTDirectEventBlock);
+RCT_EXPORT_VIEW_PROPERTY(onStopped, RCTDirectEventBlock);
 RCT_EXPORT_VIEW_PROPERTY(onViewReady, RCTDirectEventBlock);
 // Code Scanner
 RCT_EXPORT_VIEW_PROPERTY(codeScannerOptions, NSDictionary);

package/ios/Core/CameraSession.swift

@@ -249,8 +249,10 @@ class CameraSession: NSObject, AVCaptureVideoDataOutputSampleBufferDelegate, AVC
     // Start/Stop session
     if configuration.isActive {
       captureSession.startRunning()
+      delegate?.onCameraStarted()
     } else {
       captureSession.stopRunning()
+      delegate?.onCameraStopped()
     }
   }
 

package/ios/Core/CameraSessionDelegate.swift

@@ -21,6 +21,14 @@ protocol CameraSessionDelegate: AnyObject {
    Called when the [CameraSession] successfully initializes
    */
   func onSessionInitialized()
+  /**
+   Called when the [CameraSession] starts streaming frames. (isActive=true)
+   */
+  func onCameraStarted()
+  /**
+   Called when the [CameraSession] stopped streaming frames. (isActive=false)
+   */
+  func onCameraStopped()
   /**
    Called for every frame (if video or frameProcessor is enabled)
    */