element: change api to allow the use of direct gst::element

Fetch the property(s) of a given GstElement or check
the property from a feature name.

src/gps/element.rs

@@ -132,13 +132,8 @@ impl ElementInfo {
 
         element_type
     }
-    pub fn element_property(element_name: &str, property_name: &str) -> anyhow::Result<String> {
-        let feature = ElementInfo::element_feature(element_name).expect("Unable to get feature");
 
-        let factory = feature
+    pub fn element_property(element: &gst::Element, property_name: &str) -> anyhow::Result<String> {
-            .downcast::<gst::ElementFactory>()
-            .expect("Unable to get the factory from the feature");
-        let element = factory.create().build()?;
         let value = element
             .property_value(property_name)
             .transform::<String>()
@@ -148,16 +143,22 @@ impl ElementInfo {
         Ok(value)
     }
 
-    pub fn element_properties(
+    pub fn element_property_by_feature_name(
         element_name: &str,
-    ) -> anyhow::Result<HashMap<String, glib::ParamSpec>> {
+        property_name: &str,
-        let mut properties_list = HashMap::new();
+    ) -> anyhow::Result<String> {
         let feature = ElementInfo::element_feature(element_name).expect("Unable to get feature");
-
         let factory = feature
             .downcast::<gst::ElementFactory>()
             .expect("Unable to get the factory from the feature");
         let element = factory.create().build()?;
+        ElementInfo::element_property(&element, property_name)
+    }
+
+    pub fn element_properties(
+        element: &gst::Element,
+    ) -> anyhow::Result<HashMap<String, glib::ParamSpec>> {
+        let mut properties_list = HashMap::new();
         let params = element.class().list_properties();
 
         for param in params.iter() {
@@ -184,6 +185,18 @@ impl ElementInfo {
         Ok(properties_list)
     }
 
+    pub fn element_properties_by_feature_name(
+        element_name: &str,
+    ) -> anyhow::Result<HashMap<String, glib::ParamSpec>> {
+        let feature = ElementInfo::element_feature(element_name).expect("Unable to get feature");
+
+        let factory = feature
+            .downcast::<gst::ElementFactory>()
+            .expect("Unable to get the factory from the feature");
+        let element = factory.create().build()?;
+        ElementInfo::element_properties(&element)
+    }
+
     pub fn element_is_uri_src_handler(element_name: &str) -> bool {
         let feature = ElementInfo::element_feature(element_name).expect("Unable to get feature");
 

src/ui/properties.rs

@@ -52,7 +52,9 @@ pub fn property_to_widget<F: Fn(String, String) + 'static>(
             } else if (param.flags() & glib::ParamFlags::READABLE) == glib::ParamFlags::READABLE
                 || (param.flags() & glib::ParamFlags::READWRITE) == glib::ParamFlags::READWRITE
             {
-                if let Ok(value) = GPS::ElementInfo::element_property(element_name, param.name()) {
+                if let Ok(value) =
+                    GPS::ElementInfo::element_property_by_feature_name(element_name, param.name())
+                {
                     check_button.set_active(value.parse::<bool>().unwrap_or(false));
                 }
             } else if let Some(value) = value_as_str(param.default_value()) {
@@ -81,7 +83,9 @@ pub fn property_to_widget<F: Fn(String, String) + 'static>(
             } else if (param.flags() & glib::ParamFlags::READABLE) == glib::ParamFlags::READABLE
                 || (param.flags() & glib::ParamFlags::READWRITE) == glib::ParamFlags::READWRITE
             {
-                if let Ok(value) = GPS::ElementInfo::element_property(element_name, param.name()) {
+                if let Ok(value) =
+                    GPS::ElementInfo::element_property_by_feature_name(element_name, param.name())
+                {
                     entry.set_text(&value);
                 }
             } else if let Some(value) = value_as_str(param.default_value()) {
@@ -140,7 +144,9 @@ pub fn property_to_widget<F: Fn(String, String) + 'static>(
             } else if (param.flags() & glib::ParamFlags::READABLE) == glib::ParamFlags::READABLE
                 || (param.flags() & glib::ParamFlags::READWRITE) == glib::ParamFlags::READWRITE
             {
-                if let Ok(value) = GPS::ElementInfo::element_property(element_name, param.name()) {
+                if let Ok(value) =
+                    GPS::ElementInfo::element_property_by_feature_name(element_name, param.name())
+                {
                     combo.set_active(Some(value.parse::<u32>().unwrap_or(0) + 1));
                 }
             }
@@ -171,8 +177,7 @@ pub fn property_to_widget<F: Fn(String, String) + 'static>(
 pub fn display_plugin_properties(app: &GPSApp, element_name: &str, node_id: u32) {
     let update_properties: Rc<RefCell<HashMap<String, String>>> =
         Rc::new(RefCell::new(HashMap::new()));
-    let properties = GPS::ElementInfo::element_properties(element_name)
+    let properties = GPS::ElementInfo::element_properties_by_feature_name(element_name).unwrap();
-        .expect("Should get the list of the properties properly");
 
     let grid = gtk::Grid::new();
     grid.set_column_spacing(4);