gst: Pad move name definition to builders

Also apply consistent naming for builder/non-builder constructors.

See discussion in:
https://gitlab.freedesktop.org/gstreamer/gstreamer-rs/-/issues/448#note_1799092

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer-rs/-/merge_requests/1255>

gstreamer/src/ghost_pad.rs

@@ -53,64 +53,94 @@ impl GhostPad {
         }
     }
 
+    // rustdoc-stripper-ignore-next
+    /// Creates a new [`GhostPad`] object with a default name.
+    ///
+    /// Use [`GhostPad::builder()`] to get a [`PadBuilder`] and then define a specific name.
     #[doc(alias = "gst_ghost_pad_new_no_target")]
-    pub fn new(name: Option<&str>, direction: crate::PadDirection) -> Self {
+    pub fn new(direction: crate::PadDirection) -> Self {
         skip_assert_initialized!();
-        Self::builder(name, direction).build()
+        Self::builder(direction).build()
     }
 
     #[doc(alias = "gst_ghost_pad_new_no_target")]
-    pub fn builder(name: Option<&str>, direction: crate::PadDirection) -> PadBuilder<Self> {
+    pub fn builder(direction: crate::PadDirection) -> PadBuilder<Self> {
         skip_assert_initialized!();
-        PadBuilder::new(name, direction)
+        PadBuilder::new(direction)
+    }
+
+    // rustdoc-stripper-ignore-next
+    /// Creates a new [`GhostPad`] object from the [`StaticPadTemplate`](crate::StaticPadTemplate) with a default name.
+    ///
+    /// Use [`GhostPad::builder_from_static_template()`] to get a [`PadBuilder`] and then define a specific name.
+    #[doc(alias = "gst_ghost_pad_new_no_target_from_static_template")]
+    pub fn from_static_template(templ: &StaticPadTemplate) -> Self {
+        skip_assert_initialized!();
+        Self::builder_from_static_template(templ).build()
     }
 
     #[doc(alias = "gst_ghost_pad_new_no_target_from_static_template")]
-    pub fn from_static_template(templ: &StaticPadTemplate, name: Option<&str>) -> Self {
+    pub fn builder_from_static_template(templ: &StaticPadTemplate) -> PadBuilder<Self> {
         skip_assert_initialized!();
-        Self::builder_with_static_template(templ, name).build()
+        PadBuilder::from_static_template(templ)
     }
 
-    #[doc(alias = "gst_ghost_pad_new_no_target_from_static_template")]
-    pub fn builder_with_static_template(
-        templ: &StaticPadTemplate,
-        name: Option<&str>,
-    ) -> PadBuilder<Self> {
+    // rustdoc-stripper-ignore-next
+    /// Creates a new [`GhostPad`] object from the [`PadTemplate`](crate::PadTemplate) with a default name.
+    ///
+    /// Use [`GhostPad::builder_from_template()`] to get a [`PadBuilder`] and then define a specific name.
+    #[doc(alias = "gst_ghost_pad_new_no_target_from_template")]
+    pub fn from_template(templ: &crate::PadTemplate) -> Self {
         skip_assert_initialized!();
-        PadBuilder::from_static_template(templ, name)
+        Self::builder_from_template(templ).build()
     }
 
     #[doc(alias = "gst_ghost_pad_new_no_target_from_template")]
-    pub fn from_template(templ: &crate::PadTemplate, name: Option<&str>) -> Self {
+    pub fn builder_from_template(templ: &crate::PadTemplate) -> PadBuilder<Self> {
         skip_assert_initialized!();
-        Self::builder_with_template(templ, name).build()
-    }
-
-    #[doc(alias = "gst_ghost_pad_new_no_target_from_template")]
-    pub fn builder_with_template(
-        templ: &crate::PadTemplate,
-        name: Option<&str>,
-    ) -> PadBuilder<Self> {
-        skip_assert_initialized!();
-        PadBuilder::from_template(templ, name)
+        PadBuilder::from_template(templ)
     }
 
+    // rustdoc-stripper-ignore-next
+    /// Creates a new [`GhostPad`] object from the specified `target` `Pad` and a default name.
+    ///
+    /// Use [`GhostPad::builder_with_target()`] to get a [`PadBuilder`] and then define a specific name.
     #[doc(alias = "gst_ghost_pad_new")]
-    pub fn with_target<P: IsA<Pad>>(
-        name: Option<&str>,
-        target: &P,
-    ) -> Result<Self, glib::BoolError> {
+    pub fn with_target<P: IsA<Pad>>(target: &P) -> Result<Self, glib::BoolError> {
         skip_assert_initialized!();
-        Self::builder(name, target.direction()).build_with_target(target)
+        Ok(Self::builder_with_target(target)?.build())
     }
 
+    #[doc(alias = "gst_ghost_pad_new_no_target_from_template")]
+    pub fn builder_with_target<P: IsA<Pad>>(
+        target: &P,
+    ) -> Result<PadBuilder<Self>, glib::BoolError> {
+        skip_assert_initialized!();
+        Self::builder(target.direction()).with_target(target)
+    }
+
+    // rustdoc-stripper-ignore-next
+    /// Creates a new [`GhostPad`] object from the [`PadTemplate`](crate::PadTemplate)
+    /// with the specified `target` `Pad` and a default name.
+    ///
+    /// Returns `Err(_)` if the `PadTemplate` and the `target` directions differ.
+    ///
+    /// Use [`GhostPad::builder_from_template_with_target()`] to get a [`PadBuilder`] and then define a specific name.
     #[doc(alias = "gst_ghost_pad_new_from_template")]
     pub fn from_template_with_target<P: IsA<Pad>>(
         templ: &crate::PadTemplate,
-        name: Option<&str>,
         target: &P,
     ) -> Result<Self, glib::BoolError> {
         skip_assert_initialized!();
+        Ok(Self::builder_from_template_with_target(templ, target)?.build())
+    }
+
+    #[doc(alias = "gst_ghost_pad_new_from_template")]
+    pub fn builder_from_template_with_target<P: IsA<Pad>>(
+        templ: &crate::PadTemplate,
+        target: &P,
+    ) -> Result<PadBuilder<Self>, glib::BoolError> {
+        skip_assert_initialized!();
 
         if target.direction() != templ.direction() {
             return Err(glib::bool_error!(
@@ -118,7 +148,7 @@ impl GhostPad {
             ));
         }
 
-        Self::builder_with_template(templ, name).build_with_target(target)
+        Self::builder_from_template(templ).with_target(target)
     }
 }
 
@@ -380,11 +410,107 @@ impl<T: IsA<GhostPad> + IsA<Pad>> PadBuilder<T> {
         self
     }
 
-    pub fn build_with_target<P: IsA<Pad>>(self, target: &P) -> Result<T, glib::BoolError> {
+    pub fn with_target<P: IsA<Pad>>(self, target: &P) -> Result<Self, glib::BoolError> {
         assert_eq!(self.0.direction(), target.direction());
 
         self.0.set_target(Some(target))?;
 
-        Ok(self.0)
+        Ok(self)
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn from_template() {
+        crate::init().unwrap();
+
+        let caps = crate::Caps::new_any();
+        let templ = crate::PadTemplate::new(
+            "sink",
+            crate::PadDirection::Sink,
+            crate::PadPresence::Always,
+            &caps,
+        )
+        .unwrap();
+
+        let ghost_pad = GhostPad::from_template(&templ);
+        assert!(ghost_pad.name().starts_with("ghostpad"));
+
+        let ghost_pad = GhostPad::builder_from_template(&templ).build();
+        assert!(ghost_pad.name().starts_with("ghostpad"));
+
+        let ghost_pad = GhostPad::builder_from_template(&templ).name("sink").build();
+        assert_eq!(ghost_pad.name(), "sink");
+    }
+
+    #[test]
+    fn with_target() {
+        crate::init().unwrap();
+
+        let caps = crate::Caps::new_any();
+        let templ = crate::PadTemplate::new(
+            "sink",
+            crate::PadDirection::Sink,
+            crate::PadPresence::Always,
+            &caps,
+        )
+        .unwrap();
+
+        let target = crate::Pad::from_template(&templ);
+        let ghost_pad = GhostPad::with_target(&target).unwrap();
+        assert!(ghost_pad.name().starts_with("ghostpad"));
+
+        let target = crate::Pad::from_template(&templ);
+        let ghost_pad = GhostPad::builder_with_target(&target).unwrap().build();
+        assert!(ghost_pad.name().starts_with("ghostpad"));
+
+        let target = crate::Pad::from_template(&templ);
+        let ghost_pad = GhostPad::builder_with_target(&target)
+            .unwrap()
+            .name("sink")
+            .build();
+        assert_eq!(ghost_pad.name(), "sink");
+    }
+
+    #[test]
+    fn from_template_with_target() {
+        crate::init().unwrap();
+
+        let caps = crate::Caps::new_any();
+        let templ = crate::PadTemplate::new(
+            "sink",
+            crate::PadDirection::Sink,
+            crate::PadPresence::Always,
+            &caps,
+        )
+        .unwrap();
+
+        let ghost_templ = crate::PadTemplate::new(
+            "sink",
+            crate::PadDirection::Sink,
+            crate::PadPresence::Request,
+            &caps,
+        )
+        .unwrap();
+
+        let target = crate::Pad::from_template(&templ);
+        let ghost_pad = GhostPad::from_template_with_target(&ghost_templ, &target).unwrap();
+        assert!(ghost_pad.name().starts_with("ghostpad"));
+
+        let target = crate::Pad::from_template(&templ);
+        let ghost_pad = GhostPad::builder_from_template_with_target(&ghost_templ, &target)
+            .unwrap()
+            .build();
+        assert!(ghost_pad.name().starts_with("ghostpad"));
+
+        let target = crate::Pad::from_template(&templ);
+        let ghost_pad = GhostPad::builder_from_template_with_target(&ghost_templ, &target)
+            .unwrap()
+            .name("sink")
+            .build();
+        assert_eq!(ghost_pad.name(), "sink");
     }
 }

gstreamer/src/pad.rs

@@ -1518,46 +1518,52 @@ unsafe extern "C" fn destroy_closure<F>(ptr: gpointer) {
 }
 
 impl Pad {
+    // rustdoc-stripper-ignore-next
+    /// Creates a new [`Pad`] object with a default name.
+    ///
+    /// Use [`Pad::builder()`] to get a [`PadBuilder`] and then define a specific name.
     #[doc(alias = "gst_pad_new")]
-    pub fn new(name: Option<&str>, direction: crate::PadDirection) -> Self {
+    pub fn new(direction: crate::PadDirection) -> Self {
         skip_assert_initialized!();
-        Self::builder(name, direction).build()
+        Self::builder(direction).build()
     }
 
     #[doc(alias = "gst_pad_new")]
-    pub fn builder(name: Option<&str>, direction: crate::PadDirection) -> PadBuilder<Self> {
+    pub fn builder(direction: crate::PadDirection) -> PadBuilder<Self> {
         skip_assert_initialized!();
-        PadBuilder::new(name, direction)
+        PadBuilder::new(direction)
+    }
+
+    // rustdoc-stripper-ignore-next
+    /// Creates a new [`Pad`] object from the [`StaticPadTemplate`](crate::StaticPadTemplate) with a default name.
+    ///
+    /// Use [`Pad::builder_from_static_template()`] to get a [`PadBuilder`] and then define a specific name.
+    #[doc(alias = "gst_pad_new_from_static_template")]
+    pub fn from_static_template(templ: &StaticPadTemplate) -> Self {
+        skip_assert_initialized!();
+        Self::builder_from_static_template(templ).build()
     }
 
     #[doc(alias = "gst_pad_new_from_static_template")]
-    pub fn from_static_template(templ: &StaticPadTemplate, name: Option<&str>) -> Self {
+    pub fn builder_from_static_template(templ: &StaticPadTemplate) -> PadBuilder<Self> {
         skip_assert_initialized!();
-        Self::builder_with_static_template(templ, name).build()
+        PadBuilder::from_static_template(templ)
     }
 
-    #[doc(alias = "gst_pad_new_from_static_template")]
-    pub fn builder_with_static_template(
-        templ: &StaticPadTemplate,
-        name: Option<&str>,
-    ) -> PadBuilder<Self> {
+    // rustdoc-stripper-ignore-next
+    /// Creates a new [`Pad`] object from the [`PadTemplate`](crate::PadTemplate) with a default name.
+    ///
+    /// Use [`Pad::builder_from_template()`] to get a [`PadBuilder`] and then define a specific name.
+    #[doc(alias = "gst_pad_new_from_template")]
+    pub fn from_template(templ: &crate::PadTemplate) -> Self {
         skip_assert_initialized!();
-        PadBuilder::from_static_template(templ, name)
+        Self::builder_from_template(templ).build()
     }
 
     #[doc(alias = "gst_pad_new_from_template")]
-    pub fn from_template(templ: &crate::PadTemplate, name: Option<&str>) -> Self {
+    pub fn builder_from_template(templ: &crate::PadTemplate) -> PadBuilder<Self> {
         skip_assert_initialized!();
-        Self::builder_with_template(templ, name).build()
-    }
-
-    #[doc(alias = "gst_pad_new_from_template")]
-    pub fn builder_with_template(
-        templ: &crate::PadTemplate,
-        name: Option<&str>,
-    ) -> PadBuilder<Self> {
-        skip_assert_initialized!();
-        PadBuilder::from_template(templ, name)
+        PadBuilder::from_template(templ)
     }
 
     #[doc(alias = "gst_pad_query_default")]
@@ -1611,11 +1617,10 @@ impl Pad {
 pub struct PadBuilder<T>(pub(crate) T);
 
 impl<T: IsA<Pad> + IsA<glib::Object> + glib::object::IsClass> PadBuilder<T> {
-    pub fn new(name: Option<&str>, direction: crate::PadDirection) -> Self {
+    pub fn new(direction: crate::PadDirection) -> Self {
         assert_initialized_main_thread!();
 
         let pad = glib::Object::builder::<T>()
-            .property("name", name)
             .property("direction", direction)
             .build();
 
@@ -1631,14 +1636,14 @@ impl<T: IsA<Pad> + IsA<glib::Object> + glib::object::IsClass> PadBuilder<T> {
         PadBuilder(pad)
     }
 
-    pub fn from_static_template(templ: &StaticPadTemplate, name: Option<&str>) -> Self {
+    pub fn from_static_template(templ: &StaticPadTemplate) -> Self {
         skip_assert_initialized!();
 
         let templ = templ.get();
-        Self::from_template(&templ, name)
+        Self::from_template(&templ)
     }
 
-    pub fn from_template(templ: &crate::PadTemplate, name: Option<&str>) -> Self {
+    pub fn from_template(templ: &crate::PadTemplate) -> Self {
         assert_initialized_main_thread!();
 
         let mut type_ = T::static_type();
@@ -1661,7 +1666,6 @@ impl<T: IsA<Pad> + IsA<glib::Object> + glib::object::IsClass> PadBuilder<T> {
         }
 
         let mut properties = [
-            ("name", name.map(glib::GString::from).into()),
             ("direction", templ.direction().into()),
             ("template", templ.into()),
         ];
@@ -1681,6 +1685,12 @@ impl<T: IsA<Pad> + IsA<glib::Object> + glib::object::IsClass> PadBuilder<T> {
         PadBuilder(pad)
     }
 
+    pub fn name(self, name: impl Into<glib::GString>) -> Self {
+        self.0.set_property("name", name.into());
+
+        self
+    }
+
     #[doc(alias = "gst_pad_set_activate_function")]
     pub fn activate_function<F>(self, func: F) -> Self
     where
@@ -1867,7 +1877,8 @@ mod tests {
         let events_clone = events.clone();
         let buffers = Arc::new(Mutex::new(Vec::new()));
         let buffers_clone = buffers.clone();
-        let pad = crate::Pad::builder(Some("sink"), crate::PadDirection::Sink)
+        let pad = crate::Pad::builder(crate::PadDirection::Sink)
+            .name("sink")
             .event_function(move |_, _, event| {
                 let mut events = events_clone.lock().unwrap();
                 events.push(event);
@@ -1910,7 +1921,8 @@ mod tests {
     fn test_getrange_function() {
         crate::init().unwrap();
 
-        let pad = crate::Pad::builder(Some("src"), crate::PadDirection::Src)
+        let pad = crate::Pad::builder(crate::PadDirection::Src)
+            .name("src")
             .activate_function(|pad, _parent| {
                 pad.activate_mode(crate::PadMode::Pull, true)
                     .map_err(|err| err.into())
@@ -1936,7 +1948,8 @@ mod tests {
         pad.set_active(false).unwrap();
         drop(pad);
 
-        let pad = crate::Pad::builder(Some("src"), crate::PadDirection::Src)
+        let pad = crate::Pad::builder(crate::PadDirection::Src)
+            .name("src")
             .activate_function(|pad, _parent| {
                 pad.activate_mode(crate::PadMode::Pull, true)
                     .map_err(|err| err.into())
@@ -1969,7 +1982,9 @@ mod tests {
     fn test_task() {
         crate::init().unwrap();
 
-        let pad = crate::Pad::new(Some("sink"), crate::PadDirection::Sink);
+        let pad = crate::Pad::builder(crate::PadDirection::Sink)
+            .name("sink")
+            .build();
         let (sender, receiver) = channel();
 
         let mut i = 0;
@@ -1990,8 +2005,11 @@ mod tests {
     fn test_remove_probe_from_probe() {
         crate::init().unwrap();
 
-        let src_pad = crate::Pad::new(Some("src"), crate::PadDirection::Src);
-        let sink_pad = crate::Pad::builder(Some("sink"), crate::PadDirection::Sink)
+        let src_pad = crate::Pad::builder(crate::PadDirection::Src)
+            .name("src")
+            .build();
+        let sink_pad = crate::Pad::builder(crate::PadDirection::Sink)
+            .name("sink")
             .chain_function(|_pad, _parent, _buffer| Ok(crate::FlowSuccess::Ok))
             .build();
 
@@ -2027,7 +2045,9 @@ mod tests {
         crate::init().unwrap();
 
         let (major, minor, micro, _) = crate::version();
-        let pad = crate::Pad::new(Some("src"), crate::PadDirection::Src);
+        let pad = crate::Pad::builder(crate::PadDirection::Src)
+            .name("src")
+            .build();
         let events = Arc::new(Mutex::new(Vec::new()));
         let buffers = Arc::new(Mutex::new(Vec::new()));
 
@@ -2123,7 +2143,9 @@ mod tests {
     fn test_sticky_events() {
         crate::init().unwrap();
 
-        let pad = crate::Pad::builder(Some("sink"), crate::PadDirection::Sink).build();
+        let pad = crate::Pad::builder(crate::PadDirection::Sink)
+            .name("sink")
+            .build();
         pad.set_active(true).unwrap();
 
         // Send some sticky events
@@ -2149,7 +2171,9 @@ mod tests {
     fn test_sticky_events_foreach() {
         crate::init().unwrap();
 
-        let pad = crate::Pad::builder(Some("sink"), crate::PadDirection::Sink).build();
+        let pad = crate::Pad::builder(crate::PadDirection::Sink)
+            .name("sink")
+            .build();
         pad.set_active(true).unwrap();
 
         // Send some sticky events
@@ -2248,4 +2272,27 @@ mod tests {
             sticky_events5[1].as_ref() as *const _
         );
     }
+
+    #[test]
+    fn from_template() {
+        crate::init().unwrap();
+
+        let caps = crate::Caps::new_any();
+        let templ = crate::PadTemplate::new(
+            "sink",
+            crate::PadDirection::Sink,
+            crate::PadPresence::Always,
+            &caps,
+        )
+        .unwrap();
+
+        let pad = Pad::from_template(&templ);
+        assert!(pad.name().starts_with("pad"));
+
+        let pad = Pad::builder_from_template(&templ).build();
+        assert!(pad.name().starts_with("pad"));
+
+        let pad = Pad::builder_from_template(&templ).name("sink").build();
+        assert_eq!(pad.name(), "sink");
+    }
 }

gstreamer/src/subclass/element.rs

@@ -584,7 +584,8 @@ mod tests {
 
             fn with_class(klass: &Self::Class) -> Self {
                 let templ = klass.pad_template("sink").unwrap();
-                let sinkpad = crate::Pad::builder_with_template(&templ, Some("sink"))
+                let sinkpad = crate::Pad::builder_from_template(&templ)
+                    .name("sink")
                     .chain_function(|pad, parent, buffer| {
                         TestElement::catch_panic_pad_function(
                             parent,
@@ -609,7 +610,8 @@ mod tests {
                     .build();
 
                 let templ = klass.pad_template("src").unwrap();
-                let srcpad = crate::Pad::builder_with_template(&templ, Some("src"))
+                let srcpad = crate::Pad::builder_from_template(&templ)
+                    .name("src")
                     .event_function(|pad, parent, event| {
                         TestElement::catch_panic_pad_function(
                             parent,

gstreamer/src/subclass/pad.rs

@@ -141,7 +141,7 @@ mod tests {
 
         assert_eq!(pad.name(), "test");
 
-        let otherpad = Pad::new(Some("other-test"), PadDirection::Sink);
+        let otherpad = Pad::builder(PadDirection::Sink).name("other-test").build();
         pad.link(&otherpad).unwrap();
         pad.unlink(&otherpad).unwrap();
 

tutorials/src/bin/playback-tutorial-7.rs

@@ -34,7 +34,10 @@ fn tutorial_main() -> Result<(), Error> {
     let pad = equalizer
         .static_pad("sink")
         .expect("Failed to get a static pad from equalizer.");
-    let ghost_pad = gst::GhostPad::with_target(Some("sink"), &pad).unwrap();
+    let ghost_pad = gst::GhostPad::builder_with_target(&pad)
+        .unwrap()
+        .name("sink")
+        .build();
     ghost_pad.set_active(true)?;
     bin.add_pad(&ghost_pad)?;