Allow to build multiple actors from a BuilderUtilizer

examples/example_actor_per_row.rs

@@ -1,9 +1,9 @@
 #[derive(woab::Factories)]
 pub struct Factories {
     #[factory(extra(buf_sum))]
-    win_app: woab::Factory<WindowActor, WindowWidgets, WindowSignal>,
+    win_app: woab::BuilderFactory,
     #[factory(extra(buf_addend))]
-    row_addend: woab::Factory<AddendActor, AddendWidgets, AddendSignal>,
+    row_addend: woab::BuilderFactory,
 }
 
 #[derive(woab::WidgetsFromBuilder)]
@@ -46,14 +46,16 @@ impl actix::StreamHandler<WindowSignal> for WindowActor {
         use gtk::prelude::*;;
         match signal {
             WindowSignal::ClickButton => {
-                let addend = self.factories.row_addend.build().actor(|_, widgets| {
-                    self.widgets.lst_addition.add(&widgets.row_addend);
-                    AddendActor {
-                        widgets,
-                        window: ctx.address(),
-                        number: Some(0),
-                    }
-                }).unwrap();
+                let addend = self.factories.row_addend.instantiate()
+                    .new_actor(|builder_ctx| {
+                        let widgets: AddendWidgets = builder_ctx.connect_widgets().unwrap();
+                        self.widgets.lst_addition.add(&widgets.row_addend);
+                        AddendActor {
+                            widgets,
+                            window: ctx.address(),
+                            number: Some(0),
+                        }
+                    });
                 self.addends.push(addend);
                 ctx.address().do_send(Recalculate);
             }
@@ -162,11 +164,15 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
     gtk::init()?;
     woab::run_actix_inside_gtk_event_loop("example")?;
 
-    factories.win_app.build().actor(|_, widgets| WindowActor {
-        widgets,
-        factories,
-        addends: Vec::new(),
-    })?;
+    factories.win_app.instantiate()
+        .new_actor(|ctx| {
+            ctx.connect_signals::<WindowSignal>();
+            WindowActor {
+                widgets: ctx.connect_widgets().unwrap(),
+                factories,
+                addends: Vec::new(),
+            }
+        });
 
     gtk::main();
     Ok(())

examples/example_events.rs

@@ -3,7 +3,7 @@ use std::time::{Instant, Duration};
 #[derive(woab::Factories)]
 pub struct Factories {
     #[factory(extra(buf_count_pressed_time))]
-    win_app: woab::Factory<WindowActor, WindowWidgets, WindowSignal>,
+    win_app: woab::BuilderFactory,
 }
 
 #[derive(woab::WidgetsFromBuilder)]
@@ -88,11 +88,15 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
     gtk::init()?;
     woab::run_actix_inside_gtk_event_loop("example")?;
 
-    factories.win_app.build().actor(|_, widgets| WindowActor {
-        widgets,
-        press_times: Default::default(),
-        total_durations: Default::default(),
-    })?;
+    factories.win_app.instantiate()
+        .new_actor(|ctx| {
+            ctx.connect_signals::<WindowSignal>();
+            WindowActor {
+                widgets: ctx.connect_widgets().unwrap(),
+                press_times: Default::default(),
+                total_durations: Default::default(),
+            }
+        });
 
     gtk::main();
     Ok(())

examples/example_taggged_signals.rs

@@ -3,9 +3,9 @@ use gtk::prelude::*;
 #[derive(woab::Factories)]
 pub struct Factories {
     #[factory(extra(buf_sum))]
-    win_app: woab::Factory<WindowActor, WindowWidgets, WindowSignal>,
+    win_app: woab::BuilderFactory,
     #[factory(extra(buf_addend))]
-    row_addend: woab::Factory<(), AddendWidgets, AddendSignal>,
+    row_addend: woab::BuilderFactory,
 }
 
 #[derive(woab::WidgetsFromBuilder)]
@@ -46,9 +46,9 @@ impl actix::StreamHandler<WindowSignal> for WindowActor {
             WindowSignal::ClickButton => {
                 let addend_id = self.next_addend_id;
                 self.next_addend_id += 1;
-                let widgets = self.factories.row_addend.build()
-                    .connect_tagged_builder_signals(ctx, addend_id)
-                    .widgets().unwrap();
+                let mut builder = self.factories.row_addend.instantiate();
+                builder.connect_signals_tagged(addend_id, ctx);
+                let widgets = builder.connect_widgets::<AddendWidgets>().unwrap();
                 self.widgets.lst_addition.add(&widgets.row_addend);
                 self.addends.insert(addend_id, (widgets, Some(0)));
                 self.recalculate();
@@ -111,12 +111,16 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
     gtk::init()?;
     woab::run_actix_inside_gtk_event_loop("example")?;
 
-    factories.win_app.build().actor(|_, widgets| WindowActor {
-        widgets,
-        factories,
-        next_addend_id: 0,
-        addends: Default::default(),
-    })?;
+    factories.win_app.instantiate()
+        .new_actor(|ctx| {
+            ctx.connect_signals::<WindowSignal>();
+            WindowActor {
+                widgets: ctx.connect_widgets().unwrap(),
+                factories,
+                next_addend_id: 0,
+                addends: Default::default(),
+            }
+        });
 
     gtk::main();
     Ok(())

macros/src/builder_signal_derive.rs

@@ -14,7 +14,7 @@ pub fn impl_builder_signal_derive(ast: &syn::DeriveInput) -> Result<proc_macro2:
         return Err(Error::new_spanned(ast, "BuilderSignal only supports enums"));
     };
     let enum_ident = &ast.ident;
-    let match_arms = data_enum.variants.iter().map(|variant| {
+    let vec_of_tuples = data_enum.variants.iter().map(|variant| {
         let mut ret = None;
         iter_attrs_parameters(&variant.attrs, "signal", |name, value| {
             match path_to_single_string(&name)?.as_str() {
@@ -92,29 +92,44 @@ pub fn impl_builder_signal_derive(ast: &syn::DeriveInput) -> Result<proc_macro2:
             syn::Fields::Unit => quote!(#enum_ident::#variant_ident),
             syn::Fields::Named(_) => return Err(Error::new_spanned(variant, "BuilderSignal only supports unit or tuple variants (even if they are empty)")),
         };
-        Ok(quote! {
-            #ident_as_str => Some(Box::new(move |args| {
-                match tx.clone().try_send(#msg_construction) {
-                    Ok(_) => #signal_return_value,
-                    Err(tokio::sync::mpsc::error::TrySendError::Closed(_)) => {
-                        panic!("Unable to send {} signal - channel is closed", #ident_as_str);
-                    },
-                    Err(tokio::sync::mpsc::error::TrySendError::Full(_)) => {
-                        panic!("Unable to send {} signal - channel is full", #ident_as_str);
-                    },
-                }
-            })),
-        })
+        Ok((
+            /* Match arms */
+            quote! {
+                #ident_as_str => Some(Box::new(move |args| {
+                    match tx.clone().try_send(#msg_construction) {
+                        Ok(_) => #signal_return_value,
+                        Err(tokio::sync::mpsc::error::TrySendError::Closed(_)) => {
+                            panic!("Unable to send {} signal - channel is closed", #ident_as_str);
+                        },
+                        Err(tokio::sync::mpsc::error::TrySendError::Full(_)) => {
+                            panic!("Unable to send {} signal - channel is full", #ident_as_str);
+                        },
+                    }
+                })),
+            },
+            /* Signal names */
+            quote! {
+                #ident_as_str,
+            },
+        ))
     }).collect::<Result<Vec<_>, Error>>()?;
+    /* We cannot use unzip with error handling, so here's a workaround */
+    let (match_arms, signal_names) = vec_of_tuples.into_iter().unzip::<_, _, Vec<_>, Vec<_>>();
     Ok(quote! {
         impl woab::BuilderSignal for #enum_ident {
-            fn transmit_signal_in_stream_function(signal: &str, tx: tokio::sync::mpsc::Sender<Self>) -> Option<Box<dyn Fn(&[glib::Value]) -> Option<glib::Value>>> {
+            fn bridge_signal(signal: &str, tx: tokio::sync::mpsc::Sender<Self>) -> Option<woab::RawSignalCallback> {
                 use tokio::sync::mpsc::error::TrySendError;
                 match signal {
                     #(#match_arms)*
                     _ => None,
                 }
             }
+
+            fn list_signals() -> &'static [&'static str] {
+                &[
+                    #(#signal_names)*
+                ]
+            }
         }
     })
 }

macros/src/lib.rs

@@ -4,7 +4,7 @@ mod factories_derive;
 mod removable_derive;
 mod util;
 
-#[proc_macro_derive(WidgetsFromBuilder)]
+#[proc_macro_derive(WidgetsFromBuilder, attributes(widget))]
 pub fn derive_widgets_from_builder(input: proc_macro::TokenStream) -> proc_macro::TokenStream {
     let input = syn::parse_macro_input!(input as syn::DeriveInput);
     match widgets_from_builder_derive::impl_widgets_from_builder_derive(&input) {

macros/src/widgets_from_builder_derive.rs

@@ -1,6 +1,7 @@
 use syn::parse::Error;
 use syn::spanned::Spanned;
 use quote::quote;
+use crate::util::{iter_attrs_parameters, path_to_single_string};
 
 pub fn impl_widgets_from_builder_derive(ast: &syn::DeriveInput) -> Result<proc_macro2::TokenStream, Error> {
     let fields = if let syn::Data::Struct(syn::DataStruct {
@@ -13,9 +14,31 @@ pub fn impl_widgets_from_builder_derive(ast: &syn::DeriveInput) -> Result<proc_m
     };
     let struct_ident = &ast.ident;
     let ctor_arms = fields.named.iter().map(|field| {
+        /* Handle renaming */
+        let mut name = None;
+        iter_attrs_parameters(&field.attrs, "widget", |attr_name, value| {
+            match path_to_single_string(&attr_name)?.as_str() {
+                "name" => {
+                    let value = value.ok_or_else(|| Error::new_spanned(attr_name, "attribute `name` must have a value"))?;
+                    if name.is_some() {
+                        return Err(Error::new_spanned(value, "attribute `name` can only be specified once"));
+                    }
+                    name = Some(value);
+                },
+                _ => {
+                    return Err(Error::new_spanned(attr_name, "unknown attribute"));
+                },
+            }
+            Ok(())
+        })?;
+
         let field_ident = field.ident.as_ref().ok_or_else(|| Error::new(field.span(), "Nameless field"))?;
         let field_type = &field.ty;
-        let ident_as_str = syn::LitStr::new(&field_ident.to_string(), field_ident.span());
+        let ident_as_str = match name {
+            Some(syn::Expr::Lit(syn::ExprLit {lit: syn::Lit::Str(name), ..})) => name,
+            None => syn::LitStr::new(&field_ident.to_string(), field_ident.span()),
+            _ => return Err(Error::new_spanned(name, "`name` attribute must have a string literal value")),
+        };
         Ok(quote!{
             #field_ident: builder.get_object(#ident_as_str).ok_or_else(|| {
                 if let Some(object) = builder.get_object::<glib::Object>(#ident_as_str) {
@@ -42,5 +65,13 @@ pub fn impl_widgets_from_builder_derive(ast: &syn::DeriveInput) -> Result<proc_m
                 })
             }
         }
+
+        impl std::convert::TryFrom<gtk::Builder> for #struct_ident {
+            type Error = woab::Error;
+
+            fn try_from(builder: gtk::Builder) -> Result<Self, Self::Error> {
+                <Self as std::convert::TryFrom<&gtk::Builder>>::try_from(&builder)
+            }
+        }
     })
 }