Add new gtk-rs-core 0.20 / gtk4-rs 0.9 release

_posts/2024-07-17-new-release.md

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+---
+layout: post
+author: gtk-rs developers
+title: New Release
+categories: [front, crates]
+date: 2024-07-17 09:00:00 +0000
+---
+
+gtk4-rs `0.9` and gtk-rs-core `0.20` were just freshly released, just in time
+for also being included in the GNOME 47 release.
+
+This release is again relatively small, mostly providing bindings to new APIs
+and improvements to the `glib::clone!` and `glib::closure!` macros to work
+better with `cargo fmt` and rust-analyzer.
+
+As usual, at the same time gstreamer-rs `0.23` and gst-plugins-rs `0.13`,
+libadwaita `0.7` and other related crates got a new release compatible with
+the new gtk4-rs and gtk-rs-core releases and their own set of changes.
+
+### gtk-rs-core
+
+#### New syntax for `glib::clone!` and `glib::closure!`
+
+The syntax for the `clone!` and `closure!` macros was updated to look more
+like valid Rust code, and as a side effect it is also handled correctly by
+`cargo fmt`, rust-analyzer and other tooling now.
+
+The old syntax is still supported but will give a deprecation warning.
+
+To get an idea of the change, what previously looked like:
+
+```rust
+clone!(@strong self as obj, @weak v => @default-return false, move |x| {
+    println!("obj: {}, v: {}, x: {}", obj, v, x);
+    true
+})
+```
+
+would now look like this:
+
+```rust
+clone!(
+    #[strong(rename_to = obj)]
+    self,
+    #[weak]
+    v,
+    #[upgrade_or]
+    false,
+    move |x| {
+        println!("obj: {}, v: {}, x: {}", obj, v, x);
+        true
+    },
+);
+```
+
+Check the [documentation](https://gtk-rs.org/gtk-rs-core/stable/0.20/docs/glib/macro.clone.html) for more details about the new syntax.
+
+#### GLib 2.82 APIs
+
+New GLib and GIO 2.82 APIs are supported with this release. GLib 2.56 is still
+the minimum version supported by the bindings.
+
+#### Trait re-organization for defining new GObject interfaces
+
+The traits for defining new GObject interfaces were slightly re-organized to
+make them more similar with the ones for defining new GObjects.
+
+Previously one would write:
+
+```rust
+#[derive(Clone, Copy)]
+#[repr(C)]
+pub struct MyStaticInterface {
+    parent: glib::gobject_ffi::GTypeInterface,
+}
+
+#[glib::object_interface]
+unsafe impl ObjectInterface for MyStaticInterface {
+    const NAME: &'static str = "MyStaticInterface";
+}
+```
+
+This would now become:
+
+```rust
+#[derive(Clone, Copy)]
+#[repr(C)]
+pub struct MyStaticInterfaceClass {
+    parent: glib::gobject_ffi::GTypeInterface,
+}
+
+unsafe impl InterfaceStruct for MyStaticInterfaceClass {
+    type Type = MyStaticInterface;
+}
+
+pub enum MyStaticInterface {}
+
+#[glib::object_interface]
+impl ObjectInterface for MyStaticInterface {
+    const NAME: &'static str = "MyStaticInterface";
+
+    type Interface = MyStaticInterfaceClass;
+}
+```
+
+While it is a bit more code, this is almost the same as for GObjects now.
+
+#### Safer borrowing of GObjects and other types from FFI code
+
+It is possible to directly borrow GObjects and other types in FFI code without
+additional refcounting or copying. In previous releases the API for that was
+completely based on pointers, which allowed to accidentally create dangling
+pointers without the compiler being able to help.
+
+```rust
+let obj = {
+    let mut ptr: *mut glib::ffi::GObject = ...;
+    let obj: &glib::Object = glib::Object::from_glib_ptr_borrow(&mut ptr);
+    obj
+};
+// At this point `obj` is pointing at a stack frame that does not exist anymore
+```
+
+Starting with this release, a reference to a pointer is used instead to avoid
+this from happening. The above code would not compile anymore. Previously the
+lifetime of the returned object would be arbitrary, now it is bound strictly
+to the lifetime of the pointer.
+
+Code using this API likely does not need any changes unless the code was
+previously wrong.
+
+### gtk4-rs
+
+#### GTK 4.16 APIs
+
+New GTK 4.16 APIs are supported with this release. GTK 4.0 is still the
+minimum version supported by the bindings.
+
+### Changes
+
+For the interested ones, here is the list of the merged pull requests:
+
+[gtk4-rs](https://github.com/gtk-rs/gtk4-rs):
+
+ * [Update to new clone! macro syntax](https://github.com/gtk-rs/gtk4-rs/pull/1773)
+ * [book: Fix typo](https://github.com/gtk-rs/gtk4-rs/pull/1769)
+ * [Remove unnecessary upcast from examples/squeezer\_bin/main.rs](https://github.com/gtk-rs/gtk4-rs/pull/1763)
+ * [typos: Ignore versions.txt file](https://github.com/gtk-rs/gtk4-rs/pull/1762)
+ * [examples/squeezer\_bin: Mark properties as writable](https://github.com/gtk-rs/gtk4-rs/pull/1761)
+ * [Fix `SqueezerBin::size\_allocate()` in example](https://github.com/gtk-rs/gtk4-rs/pull/1760)
+ * [Stop renaming ffi crates](https://github.com/gtk-rs/gtk4-rs/pull/1758)
+ * [custom\_orientable: Fix interface property override](https://github.com/gtk-rs/gtk4-rs/pull/1755)
+ * [gtk: Implement Downgrade for TemplateChild<T>](https://github.com/gtk-rs/gtk4-rs/pull/1750)
+ * [Update list\_widgets.md](https://github.com/gtk-rs/gtk4-rs/pull/1742)
+ * [examples: Support GL >= 3.1 and GLES >= 3.0 in the glium example](https://github.com/gtk-rs/gtk4-rs/pull/1733)
+ * [Update link for Cogitri/Health to World/Health](https://github.com/gtk-rs/gtk4-rs/pull/1725)
+ * [Simplify reading file contents to a String](https://github.com/gtk-rs/gtk4-rs/pull/1719)
+ * [macros: Drop anyhow dependency](https://github.com/gtk-rs/gtk4-rs/pull/1708)
+ * [Fix typo in todo\_1.md](https://github.com/gtk-rs/gtk4-rs/pull/1707)
+ * [gtk4: Manually implement `GraphicsOffload` constructor for now](https://github.com/gtk-rs/gtk4-rs/pull/1705)
+ * [gtk4: Require GDK 4.14 when enabling the `v4\_14` feature](https://github.com/gtk-rs/gtk4-rs/pull/1704)
+ * [macros: Drop macro-proc-error and upgrade syn to 2.0](https://github.com/gtk-rs/gtk4-rs/pull/1688)
+ * [dockerfile: Update libadwaita to 1.5](https://github.com/gtk-rs/gtk4-rs/pull/1687)
+ * [docs: fix `Path` setting on windows](https://github.com/gtk-rs/gtk4-rs/pull/1675)
+ * [Correctly handle `NULL` `GError\*\*` out parameters](https://github.com/gtk-rs/gtk4-rs/pull/1672)
+ * [Replace simple `impl Debug` with derived `Debug` in tokio example](https://github.com/gtk-rs/gtk4-rs/pull/1663)
+ * [Simplify library configuration step for Windows](https://github.com/gtk-rs/gtk4-rs/pull/1644)
+
+[gtk-rs-core](https://github.com/gtk-rs/gtk-rs-core):
+
+ * [docs: Run on our container image](https://github.com/gtk-rs/gtk-rs-core/pull/1455)
+ * [gio: Add a method to get a stream of incoming connections to SocketListener](https://github.com/gtk-rs/gtk-rs-core/pull/1454)
+ * [glib: Add support for registering GTypes with name conflicts](https://github.com/gtk-rs/gtk-rs-core/pull/1451)
+ * [glib: Make `TypeData` struct fields private](https://github.com/gtk-rs/gtk-rs-core/pull/1449)
+ * [glib-macros: Don't produce unnecessary braces in `clone!(async move { x })`](https://github.com/gtk-rs/gtk-rs-core/pull/1443)
+ * [Update to system-deps 7](https://github.com/gtk-rs/gtk-rs-core/pull/1440)
+ * [glib-macros: Fix unit return in `closure!()` macro](https://github.com/gtk-rs/gtk-rs-core/pull/1438)
+ * [strv: add From implementation from a String array](https://github.com/gtk-rs/gtk-rs-core/pull/1432)
+ * [Derive TransparentPtrType trait for Boxed](https://github.com/gtk-rs/gtk-rs-core/pull/1431)
+ * [gio: Properly export Win32InputStream / Win32OutputStream traits](https://github.com/gtk-rs/gtk-rs-core/pull/1429)
+ * [Update `clone!` and `closure!` macro to new syntax](https://github.com/gtk-rs/gtk-rs-core/pull/1424)
+ * [Stop renaming ffi crates](https://github.com/gtk-rs/gtk-rs-core/pull/1423)
+ * [gio: remove Send + Sync requirements from DBusConnection::register\_ob…](https://github.com/gtk-rs/gtk-rs-core/pull/1422)
+ * [spell fix](https://github.com/gtk-rs/gtk-rs-core/pull/1419)
+ * [gio: make DBusConnection::register\_object take optional clousures](https://github.com/gtk-rs/gtk-rs-core/pull/1417)
+ * [glib: Add unsafe `Value::into\_send\_value()`](https://github.com/gtk-rs/gtk-rs-core/pull/1413)
+ * [glib: Improve `ValueArray` API, add tests and assertions for invalid …](https://github.com/gtk-rs/gtk-rs-core/pull/1411)
+ * [glib: Fix `MatchInfo::next()` handling of returning `FALSE`](https://github.com/gtk-rs/gtk-rs-core/pull/1410)
+ * [glib/functions: add compute\_checksum\_for\_string](https://github.com/gtk-rs/gtk-rs-core/pull/1406)
+ * [glib: Add bindings for `g\_value\_set\_static\_string()`](https://github.com/gtk-rs/gtk-rs-core/pull/1400)
+ * [docs: Fix broken links / cleanup README](https://github.com/gtk-rs/gtk-rs-core/pull/1395)
+ * [glib: Implement Sync for ThreadGuard](https://github.com/gtk-rs/gtk-rs-core/pull/1388)
+ * [glib: Only implement Send on JoinHandle if the result is Send](https://github.com/gtk-rs/gtk-rs-core/pull/1387)
+ * [glib: Decouple ObjectInterface impl from interface class struct](https://github.com/gtk-rs/gtk-rs-core/pull/1384)
+ * [glib: Add missing Send bound to the output type of the `spawn\_from\_within()` future](https://github.com/gtk-rs/gtk-rs-core/pull/1383)
+ * [glib-macros: Refactor parsing code of object\_subclass/object\_interface](https://github.com/gtk-rs/gtk-rs-core/pull/1379)
+ * [examples: Add example for custom class structs and virtual methods](https://github.com/gtk-rs/gtk-rs-core/pull/1378)
+ * [ObjectBuilder: add property\_if(), property\_if\_some(), property\_from\_iter() \& property\_if\_not\_empty()](https://github.com/gtk-rs/gtk-rs-core/pull/1377)
+ * [glib: Don't use `g\_object\_list\_properties()` for setting properties](https://github.com/gtk-rs/gtk-rs-core/pull/1376)
+ * [glib: Use a reference to a pointer of correct mutability for from\_glib\_ptr\_borrow()](https://github.com/gtk-rs/gtk-rs-core/pull/1375)
+ * [glib: Re-add and rename manual Win32 API additions](https://github.com/gtk-rs/gtk-rs-core/pull/1372)
+ * [glib-macros/properties: Allow structs with no properties](https://github.com/gtk-rs/gtk-rs-core/pull/1370)
+ * [glib::wrapper: Add docs for impls generated by the wrapper macro](https://github.com/gtk-rs/gtk-rs-core/pull/1369)
+ * [glib-sys: Add missing includes in `manual.h`](https://github.com/gtk-rs/gtk-rs-core/pull/1361)
+ * [glib-sys: fix struct size mismatches](https://github.com/gtk-rs/gtk-rs-core/pull/1360)
+ * [glib: Freeze property notifications while setting multiple properties](https://github.com/gtk-rs/gtk-rs-core/pull/1355)
+ * [glib-macros: Improve error message when `Properties` struct doesn't have at least one `#\[property(…)\]`](https://github.com/gtk-rs/gtk-rs-core/pull/1352)
+ * [docs: `construct` attribute for `glib::Properties`](https://github.com/gtk-rs/gtk-rs-core/pull/1344)
+ * [glib: fix UB in VariantStrIter::impl\_get](https://github.com/gtk-rs/gtk-rs-core/pull/1343)
+ * [glib: Don't misuse `slice::get\_unchecked()`](https://github.com/gtk-rs/gtk-rs-core/pull/1337)
+ * [gio: correctly free argument list items](https://github.com/gtk-rs/gtk-rs-core/pull/1331)
+ * [glib: Optimize string collation bindings a bit](https://github.com/gtk-rs/gtk-rs-core/pull/1329)
+ * [glib: Drop the main context future return value sender on finalize](https://github.com/gtk-rs/gtk-rs-core/pull/1328)
+ * [pango: add some missing AttrInt constructors.](https://github.com/gtk-rs/gtk-rs-core/pull/1325)
+ * [glib: Embed docs for ParamSpec types](https://github.com/gtk-rs/gtk-rs-core/pull/1323)
+ * [glib: Requires Upgrade on Downgrade::Weak type](https://github.com/gtk-rs/gtk-rs-core/pull/1321)
+ * [macros: allow to specify #\[default\] for glib::flags](https://github.com/gtk-rs/gtk-rs-core/pull/1316)
+ * [glib: Add `Quark::from\_static\_str()`](https://github.com/gtk-rs/gtk-rs-core/pull/1312)
+ * [docs: Move metadata back to packages](https://github.com/gtk-rs/gtk-rs-core/pull/1311)
+ * [cairo: Fix version of the v1\_18 feature](https://github.com/gtk-rs/gtk-rs-core/pull/1310)
+ * [Document values of Continue and Break](https://github.com/gtk-rs/gtk-rs-core/pull/1304)
+
+All this was possible thanks to the [gtk-rs/gir](https://github.com/gtk-rs/gir) project as well:
+
+ * [Minor cleanup to use `is\_some\_and(...)` instead of `map\_or(false, ...)`](https://github.com/gtk-rs/gir/pull/1584)
+ * [Update to system-deps 7](https://github.com/gtk-rs/gir/pull/1583)
+ * [More docs improvements](https://github.com/gtk-rs/gir/pull/1576)
+ * [codegen: Handle mangled types names](https://github.com/gtk-rs/gir/pull/1575)
+ * [members: drop useless alias config](https://github.com/gtk-rs/gir/pull/1574)
+ * [Various properties fixes](https://github.com/gtk-rs/gir/pull/1573)
+ * [codegen: Avoid double alias on badly annotated fn](https://github.com/gtk-rs/gir/pull/1572)
+ * [Use getter and setter annotations](https://github.com/gtk-rs/gir/pull/1571)
+ * [Support finish-func annotation](https://github.com/gtk-rs/gir/pull/1570)
+ * [codegen: Stop renaming ffi crate](https://github.com/gtk-rs/gir/pull/1569)
+ * [Use final annotation](https://github.com/gtk-rs/gir/pull/1568)
+ * [Add support for `libc::time\_t` and related types](https://github.com/gtk-rs/gir/pull/1562)
+ * [Revert Automatically assume that win32\_ and unix\_ should use the related cfg](https://github.com/gtk-rs/gir/pull/1547)
+ * [Correctly generate cfg condition for ABI tests](https://github.com/gtk-rs/gir/pull/1546)
+ * [Generate cfgs with `update\_cfgs` on enums as well](https://github.com/gtk-rs/gir/pull/1545)
+
+Thanks to all of our contributors for their (awesome!) work on this release:
+
+ * [@A6GibKm](https://github.com/A6GibKm)
+ * [@alatiera](https://github.com/alatiera)
+ * [@amyspark](https://github.com/amyspark)
+ * [@bilelmoussaoui](https://github.com/bilelmoussaoui)
+ * [@carlosmn](https://github.com/carlosmn)
+ * [@DaKnig](https://github.com/DaKnig)
+ * [@decathorpe](https://github.com/decathorpe)
+ * [@ellnix](https://github.com/ellnix)
+ * [@enaut](https://github.com/enaut)
+ * [@exi](https://github.com/exi)
+ * [@felinira](https://github.com/felinira)
+ * [@fengalin](https://github.com/fengalin)
+ * [@GuillaumeGomez](https://github.com/GuillaumeGomez)
+ * [@Hofer-Julian](https://github.com/Hofer-Julian)
+ * [@liushuyu](https://github.com/liushuyu)
+ * [@marcinjahn](https://github.com/marcinjahn)
+ * [@misson20000](https://github.com/misson20000)
+ * [@mjgarton](https://github.com/mjgarton)
+ * [@mokurin000](https://github.com/mokurin000)
+ * [@mtilda](https://github.com/mtilda)
+ * [@nazar-pc](https://github.com/nazar-pc)
+ * [@pbor](https://github.com/pbor)
+ * [@pranjalkole](https://github.com/pranjalkole)
+ * [@sdroege](https://github.com/sdroege)
+ * [@vhakulinen](https://github.com/vhakulinen)
+ * [@woelfman](https://github.com/woelfman)
+ * [@ystreet](https://github.com/ystreet)
+ * [@zecakeh](https://github.com/zecakeh)