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{ | ||
"cSpell.words": [ | ||
"libadwaita", | ||
"relm" | ||
] | ||
} |
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--- | ||
title: "Relm4 is back! Announcing version 0.7 and 0.8" | ||
date: 2024-03-12 | ||
# weight: 1 | ||
tags: ["relm4"] | ||
author: "Aaron Erhardt" | ||
showToc: true | ||
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draft: false | ||
hidemeta: false | ||
comments: false | ||
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hideSummary: false | ||
ShowReadingTime: true | ||
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editPost: | ||
URL: "https://github.com/Relm4/blog/blob/main/content" | ||
Text: "Suggest Changes" # edit text | ||
appendFilePath: true # to append file path to Edit link | ||
--- | ||
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I'm happy to announce Relm4 0.7 and 0.8! | ||
It has been some time since I last posted here and I actually even skipped the announcement of Relm4 0.6 due to lack of time. | ||
Fortunately, I found some time this week and am back with not one, but two releases! | ||
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Because Relm4 follows the version numbers of the underlying gtk-rs crate, we decided to catch up to their recent 0.8 release and postpone any feature development to version 0.9. | ||
This means that version 0.7 and 0.8 of Relm4 are practically identical except for their dependencies. | ||
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Check out the [full changelog](https://github.com/Relm4/Relm4/blob/main/CHANGES.md) for more information. | ||
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> ## About Relm4 | ||
> | ||
> Relm4 is an idiomatic GUI library inspired by [Elm](https://elm-lang.org/) and based on [gtk4-rs](https://crates.io/crates/gtk4). | ||
> | ||
> We believe that GUI development should be easy, productive and delightful. | ||
> The [gtk4-rs](https://crates.io/crates/gtk4) crate already provides everything you need to write modern, beautiful and cross-platform applications. | ||
> Built on top of this foundation, Relm4 makes developing much more idiomatic, simpler and faster and enables you to become productive in just a few hours. | ||
## Factory changes | ||
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Starting with Relm4 0.7, factories and components share the same builder pattern for initialization. | ||
This change should especially benefit beginners as it allows reusing the patterns learned while working with components. | ||
It also makes it easier to create reusable factories because the containing component can decide what happens with output messages of the factory and whether they need to be forwarded. | ||
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<table> | ||
<tr> | ||
<th> Component </th> <th> Factory </th> | ||
</tr> | ||
<tr> | ||
<td> | ||
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```rust | ||
let component = Header::builder() | ||
.launch(init_data) | ||
.forward(sender, |msg| { ... }); | ||
``` | ||
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</td> | ||
<td> | ||
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```rust | ||
let factory = FactoryVecDeque::builder() | ||
.launch(root_widget) | ||
.forward(sender, |msg| { ... }); | ||
``` | ||
</td> | ||
</tr> | ||
</table> | ||
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## More typed abstractions | ||
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While the gtk4 crate provides outstanding Rust abstractions overall, sometimes it doesn't fully embrace the potential of the Rust language. | ||
Fortunately, to make your code more idiomatic, Relm4 adds several new typed abstractions on top of the existing ones in this release. | ||
After `TypedListView` was added in version 0.6, members of the community have since extended the abstractions with the new `TypedColumnView` and `TypedGridView` types. | ||
All three types allow you to use `gtk::ListView`, `gtk::ColumnView` and `gtk::TypedGridView` respectively without the otherwise necessary boilerplate code and also add compile-time guarantees regarding type-safety. | ||
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## Relm4 icons | ||
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Technically, the [relm4-icons crate](https://crates.io/crates/relm4-icons) has been out for quite some time, but it was never properly announced. | ||
With this crate, it becomes incredibly easy to add icons to your Relm4 and gtk-rs applications. | ||
You only need to add the crate, a small config file and call `initialize_icons()` in your setup code. | ||
While the crate ships with over 3000 ready-to-use icons and also allows you to add your own SVG icons, | ||
only the configured icons will actually be bundled with your app to keep the resulting binaries small. | ||
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If you're already using Relm4 icons, please be aware that starting with this release, you need to use a config file instead of feature flags. | ||
This is because crates.io made the crate un-publishable when [they added new limits for the amount of feature flags](https://blog.rust-lang.org/2023/10/26/broken-badges-and-23k-keywords.html). | ||
While I don't think it was a nice move to ban new releases of existing crates over night, it eventually led to a new, more flexible solution. | ||
This new solution uses a `icons.toml` configuration file to specify which icons you need in your app. | ||
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While this works great, this is still a somewhat hacked together solution because, after disallowing the use of many feature flags, Rust has no proper solution for communicating a lot of configuration options to build scripts. | ||
Hopefully, this gap will be filled with a new mechanism in the future. | ||
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## More unification | ||
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Besides factories, components also received a small, but quite noticeable change that brings more consistency. | ||
Previously, regular components received a reference to the root widget during initialization, but async components used an owned root widget instead to avoid lifetime problems. | ||
When refactoring a regular component to an async component, this caused complex error messages unless the function signatures were updated to use owned root widgets. | ||
By always using owned root widgets, it now takes even fewer steps to refactor between regular and async components. | ||
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## Other improvements | ||
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- Use native async traits instead of async-trait in v0.8 | ||
- Add `AsyncComponentStream` to supports streams for async components | ||
- Add `Toaster` as an abstraction over `adw::ToastOverlay` for usage in the model of a component | ||
- Implement more traits for recent libadwaita widgets | ||
- Port the book to 0.7 and 0.8 | ||
- Lots of other improvements and fixes | ||
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## Where to get started | ||
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+ ⬆️ **[Migration guide](https://relm4.org/book/stable/0_6_to_0_7.html)** | ||
+ 🏠 **[Website](https://relm4.org)** | ||
+ ⭐ **[Repository](https://github.com/Relm4/Relm4)** | ||
+ 📖 **[Book](https://relm4.org/book/stable)** | ||
+ 📜 **[Rust documentation](https://docs.rs/relm4)** | ||
+ 📨 **[Chat room](https://matrix.to/#/#relm4:matrix.org)** |
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