add vn::RequestProgressProviding protocol

cidre/src/vn.rs

@@ -16,6 +16,9 @@ pub use request::DetectHorizonRequest;
 pub use request::ImageBasedRequest;
 pub use request::Request;
 pub use request::RequestCh;
+pub use request::RequestProgressHandler;
+pub use request::RequestProgressProviding;
+pub use request::RequestProgressProvidingImpl;
 
 mod request_handler;
 pub use request_handler::ImageRequestHandler;

cidre/src/vn/recognize_text_request.rs

@@ -12,6 +12,8 @@ define_obj_type!(
     VN_RECOGNIZE_TEXT_REQUEST
 );
 
+impl vn::RequestProgressProviding for RecognizeTextRequest {}
+
 impl RecognizeTextRequest {
     /// only supports English
     pub const REVISION_1: usize = 1;
@@ -117,7 +119,7 @@ extern "C" {
 
 #[cfg(test)]
 mod tests {
-    use crate::{ns, vn};
+    use crate::{ns, vn, vn::RequestProgressProviding};
 
     #[test]
     fn basics() {
@@ -135,6 +137,9 @@ mod tests {
 
         assert!(request.custom_words().is_empty());
 
+        assert!(request.progress_handler().is_none());
+        assert!(!request.indeterminate());
+
         // test if api throws...
 
         request.set_min_text_height(-10.0);

cidre/src/vn/request.rs

@@ -74,6 +74,22 @@ impl DetectHorizonRequest {
     pub fn results(&self) -> Option<arc::R<ns::Array<vn::HorizonObservation>>>;
 }
 
+#[doc(alias = "VNRequestProgressHandler")]
+pub type RequestProgressHandler =
+    blocks::EscBlock<fn(request: &Request, fraction_completed: f64, error: Option<&ns::Error>)>;
+
+#[objc::protocol(VNRequestProgressProviding)]
+pub trait RequestProgressProviding: objc::Obj {
+    #[objc::msg_send(progressHandler)]
+    fn progress_handler(&self) -> Option<arc::R<RequestProgressHandler>>;
+
+    #[objc::msg_send(setProgressHandler:)]
+    fn set_progress_handler(&mut self, handler: &mut RequestProgressHandler);
+
+    #[objc::msg_send(indeterminate)]
+    fn indeterminate(&self) -> bool;
+}
+
 #[link(name = "vn", kind = "static")]
 extern "C" {
     static VN_DETECT_HORIZON_REQUEST: &'static objc::Class<DetectHorizonRequest>;