Add event example and clean-up event/message constructor API

examples/src/bin/events.rs

@@ -0,0 +1,60 @@
+extern crate gstreamer as gst;
+use gst::*;
+
+extern crate glib;
+use glib::*;
+
+fn main() {
+    gst::init().unwrap();
+
+    let main_loop = MainLoop::new(None, false);
+
+    let pipeline = gst::parse_launch("audiotestsrc ! fakesink").unwrap();
+    let bus = pipeline.get_bus().unwrap();
+
+    let ret = pipeline.set_state(gst::State::Playing);
+    assert_ne!(ret, gst::StateChangeReturn::Failure);
+
+    let main_loop_clone = main_loop.clone();
+
+    let pipeline_clone = pipeline.clone();
+    glib::timeout_add_seconds(5, move || {
+        let pipeline = &pipeline_clone;
+
+        println!("sending eos");
+
+        let ev = Event::new_eos().build();
+        pipeline.send_event(&ev);
+
+        glib::Continue(false)
+    });
+
+    //bus.add_signal_watch();
+    //bus.connect_message(move |_, msg| {
+    bus.add_watch(move |_, msg| {
+        let main_loop = &main_loop_clone;
+        match msg.view() {
+            MessageView::Eos(..) => {
+                println!("received eos");
+                main_loop.quit()
+            }
+            MessageView::Error(err) => {
+                println!(
+                    "Error from {}: {} ({:?})",
+                    msg.get_src().get_path_string(),
+                    err.get_error(),
+                    err.get_debug()
+                );
+                main_loop.quit();
+            }
+            _ => (),
+        };
+
+        glib::Continue(true)
+    });
+
+    main_loop.run();
+
+    let ret = pipeline.set_state(gst::State::Null);
+    assert_ne!(ret, gst::StateChangeReturn::Failure);
+}

gstreamer/src/event.rs

@@ -138,7 +138,9 @@ impl EventRef {
             EventView::Other
         }
     }
+}
 
+impl Event {
     pub fn new_flush_start() -> FlushStartBuilder {
         FlushStartBuilder::new()
     }

gstreamer/src/message.rs

@@ -125,7 +125,9 @@ impl MessageRef {
             MessageView::Other
         }
     }
+}
 
+impl Message {
     pub fn new_eos() -> EosBuilder {
         EosBuilder::new()
     }