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# Getting Started with OSUI
This guide will walk you through setting up your Rust project to use OSUI and creating your first interactive terminal application.
## 1. Project Setup
First, create a new Rust project (if you haven't already):
```bash
cargo new my-osui-app
cd my-osui-app
```
## 2. Add OSUI to Your `Cargo.toml`
Open your `Cargo.toml` file and add `osui` to your `[dependencies]` section. You can also specify a particular version or use `*` for the latest compatible version.
```toml
# Cargo.toml
[package]
name = "my-osui-app"
version = "0.1.0"
edition = "2021"
[dependencies]
osui = "0.1.1" # Use the latest version available on crates.io
crossterm = "0.28.1" # OSUI internally uses crossterm for terminal interactions
figlet-rs = "0.1.5" # Optional: for Heading element (if you need it)
```
The `crossterm` and `figlet-rs` dependencies are automatically included by OSUI, but explicitly listing them doesn't hurt. OSUI uses `crossterm` for low-level terminal control and `figlet-rs` for the `Heading` element, which can render ASCII art text.
## 3. Basic OSUI Application
Now, let's create a minimal OSUI application. Open `src/main.rs` and replace its contents with the following:
```rust
use osui::prelude::*; // Import all necessary OSUI items
fn main() -> std::io::Result<()> {
// Initialize the main screen abstraction.
// The Screen manages all widgets and extensions.
let screen = Screen::new();
// Register essential extensions:
// InputExtension: Handles keyboard input and dispatches events.
screen.extension(InputExtension);
// RelativeFocusExtension: Manages focus between widgets based on relative position,
// enabling navigation with arrow keys (e.g., in Flex layouts).
screen.extension(RelativeFocusExtension::new());
// Define your UI declaratively using the rsx! macro.
// This example creates a simple text string.
rsx! {
"Hello, OSUI!"
}
// Draw the defined UI tree onto the screen.
.draw(&screen);
// Start the main event loop. This blocks until the application is closed.
// It handles rendering, event processing, and extension updates.
screen.run()
}
```
## 4. Run Your Application
Save the file and run your application from the terminal:
```bash
cargo run
```
You should see "Hello, OSUI!" displayed in your terminal. You can press `Ctrl+C` or `Esc` (if you add an event handler for `Esc` like in the [Demo Application Guide](/docs/guides/building-a-demo-app)) to exit the application.
## Next Steps
* **[Concepts: Widget Model](/docs/concepts/widget-model)**: Understand the core building blocks of OSUI: Elements, Components, and Widgets.
* **[Guides: Layout and Styling](/docs/guides/layout-and-styling)**: Learn how to position and style your UI elements.
* **[Guides: Common Elements](/docs/guides/common-elements)**: Explore the built-in UI elements provided by OSUI like Divs, Flex containers, and Input fields.
* **[Guides: State and Reactivity](/docs/guides/state-and-reactivity)**: Discover how to make your UI dynamic and responsive to data changes.