Description
This code generator gets you started quickly to use Rust code from Qt and QML. In other words, it helps to create a Qt based GUI on top of Rust code.
Qt is a mature cross-platform graphical user interface library. Rust is a new programming language with strong compile time checks and a modern syntax.
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README
Rust Qt Binding Generator
[Rust Qt Binding](demo/rust_qt_binding_generator.svg)
This code generator gets you started quickly to use Rust code from Qt and QML. In other words, it helps to create a Qt based GUI on top of Rust code.
Qt is a mature cross-platform graphical user interface library. Rust is a new programming language with strong compile time checks and a modern syntax.
Getting started
There are two template projects that help you to get started quickly. One for [Qt Widgets](templates/qt_widgets) and one for [Qt Quick](templates/qt_quick). Just copy these folders as new project and start coding.
Qt Widgets (main.cpp) / Qt Quick (main.qml) ⟵ UI code, written by hand src/Binding.h ⟵ generated from binding.json src/Binding.cpp rust/src/interface.rs rust/src/implementation.rs ⟵ Rust code, written by hand
To combine Qt and Rust, write an interface in a JSON file. From that, the generator creates Qt code and Rust code. The Qt code can be used directly. The Rust code has two files: interface and implementation. The interface can be used directly.
{
"cppFile": "src/Binding.cpp",
"rust": {
"dir": "rust",
"interfaceModule": "interface",
"implementationModule": "implementation"
},
"objects": {
"Greeting": {
"type": "Object",
"properties": {
"message": {
"type": "QString",
"write": true
}
}
}
}
}
This file describes an binding with one object, Greeting. Greeting has one property: message. It is a writable property.
The Rust Qt Binding Generator will create binding source code from this description:
rust_qt_binding_generator binding.json
This will create four files:
- src/Binding.h
- src/Binding.cpp
- rust/src/interface.rs
- rust/src/implementation.rs
Only implementation.rs should be changed. The other files are the binding. implementation.rs is initialy created with a simple implementation that is shown here with some comments.
use interface::*;
/// A Greeting
pub struct Greeting {
/// Emit signals to the Qt code.
emit: GreetingEmitter,
/// The message of the person.
message: String,
}
/// Implementation of the binding
/// GreetingTrait is defined in interface.rs
impl GreetingTrait for Greeting {
/// Create a new greeting with default data.
fn new(emit: GreetingEmitter) -> Greeting {
Greeting {
emit: emit,
message: "Hello World!",
}
}
/// The emitter can emit signals to the Qt code.
fn emit(&self) -> &GreetingEmitter {
&self.emit
}
/// Get the message of the Greeting
fn message(&self) -> &str {
&self.message
}
/// Set the message of the Greeting
fn set_message(&mut self, value: String) {
self.message = value;
self.emit.message_changed();
}
}
The building block of Qt and QML projects are QObject and the Model View classes. rust_qt_binding_generator reads a json file to generate QObject or QAbstractItemModel classes that call into generated Rust files. For each type from the JSON file, a Rust trait is generated that should be implemented.
This way, Rust code can be called from Qt and QML projects.
Qt Widgets with Rust
This C++ code uses the Rust code written above.
#include "Binding.h"
#include <QDebug>
int main() {
Greeting greeting;
qDebug() << greeting.message();
return 0;
}
Qt Quick with Rust
This Qt Quick (QML) code uses the Rust code written above.
Rectangle {
Greeting {
id: rust
}
Text {
text: rust.message
}
}
Demo application
The project comes with a demo application that show a Qt user interface based on Rust. It uses all of the features of Object, List and Tree. Reading the demo code is a good way to get started.
Qt Widgets UI with Rust logic
Qt Quick Controls UI with Rust logic
Qt Quick Controls 2 UI with Rust logic
Docker development environment
To get started quickly, the project comes with a Dockerfile. You can start a docker session with the required dependencies with ./docker/docker-bash-session.sh.
More information on Qt
Tutorials
Presentation
Information on Qt
Issues
Please report bugs and feature requests in the KDE issue tracker, product "rust-qt-binding-generator".