Implement pausePreview and resumePreview

Author: swift-kim

packages/camera/CHANGELOG.md

@@ -13,5 +13,6 @@
 ## 0.3.0
 
 * Update camera to 0.9.4.
+* Implement `pausePreview` and `resumePreview`.
 * Update the example app and integration_test.
 * Remove the unused test driver.

packages/camera/tizen/src/camera_device.cc

@@ -993,6 +993,11 @@ void CameraDevice::Open(
           self->prepared_packet_ = packet;
           return;
         }
+        if (self->is_preview_paused_) {
+          media_packet_destroy(packet);
+          self->prepared_packet_ = nullptr;
+          return;
+        }
         self->prepared_packet_ = packet;
         self->registrar_->texture_registrar()->MarkTextureFrameAvailable(
             self->texture_id_);

packages/camera/tizen/src/camera_device.h

@@ -250,6 +250,9 @@ class CameraDevice {
   void LockCaptureOrientation(OrientationType orientation);
   void UnlockCaptureOrientation();
 
+  void PausePreview() { is_preview_paused_ = true; }
+  void ResumePreview() { is_preview_paused_ = false; }
+
  private:
   bool CreateCamera();
   bool ClearCameraAutoFocusArea();
@@ -357,6 +360,7 @@ class CameraDevice {
   std::vector<std::pair<int, int>> supported_recorder_resolutions_;
 
   bool enable_audio_{true};
+  bool is_preview_paused_{false};
 };
 
 #endif

packages/camera/tizen/src/camera_plugin.cc

@@ -301,6 +301,12 @@ class CameraPlugin : public flutter::Plugin {
     } else if (method_name == "unlockCaptureOrientation") {
       camera_->UnlockCaptureOrientation();
       result->Success();
+    } else if (method_name == "pausePreview") {
+      camera_->PausePreview();
+      result->Success();
+    } else if (method_name == "resumePreview") {
+      camera_->ResumePreview();
+      result->Success();
     } else if (method_name == "dispose") {
       if (camera_) {
         camera_->Dispose();