Struct tauri::Builder

pub struct Builder<R: Runtime> { /* private fields */ }

Builds a Tauri application.

Examples

tauri::Builder::default()
  // on an actual app, remove the string argument
  .run(tauri::generate_context!("test/fixture/src-tauri/tauri.conf.json"))
 .expect("error while running tauri application");

Implementations

impl<R: Runtime> Builder<R>

pub fn new() -> Self

Creates a new App builder.

impl<R: Runtime> Builder<R>

pub fn any_thread(self) -> Self

Available on Windows or Linux only.

Builds a new Tauri application running on any thread, bypassing the main thread requirement.

Platform-specific

• macOS: on macOS the application must be executed on the main thread, so this function is not exposed.

pub fn invoke_handler<F>(self, invoke_handler: F) -> Self

where F: Fn(Invoke<R>) -> bool + Send + Sync + 'static,

Defines the JS message handler callback.

Examples

#[tauri::command]
fn command_1() -> String {
  return "hello world".to_string();
}
tauri::Builder::default()
  .invoke_handler(tauri::generate_handler![
    command_1,
    // etc...
  ]);

pub fn invoke_system<F>( self, initialization_script: String, responder: F ) -> Self

where F: Fn(&Webview<R>, &str, &InvokeResponse, CallbackFn, CallbackFn) + Send + Sync + 'static,

Defines a custom JS message system.

The responder is a function that will be called when a command has been executed and must send a response to the JS layer.

The initialization_script is a script that initializes window.__TAURI_INTERNALS__.postMessage. That function must take the (message: object, options: object) arguments and send it to the backend.

pub fn setup<F>(self, setup: F) -> Self

where F: FnOnce(&mut App<R>) -> Result<(), Box<dyn Error>> + Send + 'static,

Defines the setup hook.

Examples

use tauri::Manager;
tauri::Builder::default()
  .setup(|app| {
    let main_window = app.get_window("main").unwrap();
    main_window.set_title("Tauri!");
    Ok(())
  });

pub fn on_page_load<F>(self, on_page_load: F) -> Self

where F: Fn(&Webview<R>, &PageLoadPayload<'_>) + Send + Sync + 'static,

Defines the page load hook.

pub fn plugin<P: Plugin<R> + 'static>(self, plugin: P) -> Self

Adds a Tauri application plugin.

A plugin is created using the crate::plugin::Builder struct.Check its documentation for more information.

Examples

mod plugin {
  use tauri::{plugin::{Builder as PluginBuilder, TauriPlugin}, RunEvent, Runtime};

  // this command can be called in the frontend using `invoke('plugin:window|do_something')`.
  #[tauri::command]
  async fn do_something<R: Runtime>(app: tauri::AppHandle<R>, window: tauri::Window<R>) -> Result<(), String> {
    println!("command called");
    Ok(())
  }
  pub fn init<R: Runtime>() -> TauriPlugin<R> {
    PluginBuilder::new("window")
      .setup(|app, api| {
        // initialize the plugin here
        Ok(())
      })
      .on_event(|app, event| {
        match event {
          RunEvent::Ready => {
            println!("app is ready");
          }
          RunEvent::WindowEvent { label, event, .. } => {
            println!("window {} received an event: {:?}", label, event);
          }
          _ => (),
        }
      })
      .invoke_handler(tauri::generate_handler![do_something])
      .build()
  }
}

tauri::Builder::default()
  .plugin(plugin::init());

pub fn manage<T>(self, state: T) -> Self

where T: Send + Sync + 'static,

Add state to the state managed by the application.

This method can be called any number of times as long as each call refers to a different T.

Managed state can be retrieved by any command handler via the crate::State guard. In particular, if a value of type T is managed by Tauri, adding State<T> to the list of arguments in a command handler instructs Tauri to retrieve the managed value. Additionally, state can be used to retrieve the value manually.

Panics

Panics if state of type T is already being managed.

Mutability

Since the managed state is global and must be Send + Sync, mutations can only happen through interior mutability:

use std::{collections::HashMap, sync::Mutex};
use tauri::State;
// here we use Mutex to achieve interior mutability
struct Storage {
  store: Mutex<HashMap<u64, String>>,
}
struct Connection;
struct DbConnection {
  db: Mutex<Option<Connection>>,
}

#[tauri::command]
fn connect(connection: State<DbConnection>) {
  // initialize the connection, mutating the state with interior mutability
  *connection.db.lock().unwrap() = Some(Connection {});
}

#[tauri::command]
fn storage_insert(key: u64, value: String, storage: State<Storage>) {
  // mutate the storage behind the Mutex
  storage.store.lock().unwrap().insert(key, value);
}

tauri::Builder::default()
  .manage(Storage { store: Default::default() })
  .manage(DbConnection { db: Default::default() })
  .invoke_handler(tauri::generate_handler![connect, storage_insert])
  // on an actual app, remove the string argument
  .run(tauri::generate_context!("test/fixture/src-tauri/tauri.conf.json"))
  .expect("error while running tauri application");

Examples

use tauri::State;

struct MyInt(isize);
struct MyString(String);

#[tauri::command]
fn int_command(state: State<MyInt>) -> String {
    format!("The stateful int is: {}", state.0)
}

#[tauri::command]
fn string_command<'r>(state: State<'r, MyString>) {
    println!("state: {}", state.inner().0);
}

tauri::Builder::default()
  .manage(MyInt(10))
  .manage(MyString("Hello, managed state!".to_string()))
  .invoke_handler(tauri::generate_handler![int_command, string_command])
  // on an actual app, remove the string argument
  .run(tauri::generate_context!("test/fixture/src-tauri/tauri.conf.json"))
  .expect("error while running tauri application");

pub fn menu<F: FnOnce(&AppHandle<R>) -> Result<Menu<R>> + Send + 'static>( self, f: F ) -> Self

Sets the menu to use on all windows.

Examples

use tauri::menu::{Menu, MenuItem, PredefinedMenuItem, Submenu};

tauri::Builder::default()
  .menu(|handle| Menu::with_items(handle, &[
    &Submenu::with_items(
      handle,
      "File",
      true,
      &[
        &PredefinedMenuItem::close_window(handle, None)?,
        #[cfg(target_os = "macos")]
        &MenuItem::new(handle, "Hello", true, None::<&str>)?,
      ],
    )?
  ]));

pub fn enable_macos_default_menu(self, enable: bool) -> Self

Enable or disable the default menu on macOS. Enabled by default.

Examples

tauri::Builder::default()
  .enable_macos_default_menu(false);

pub fn on_window_event<F: Fn(&Window<R>, &WindowEvent) + Send + Sync + 'static>( self, handler: F ) -> Self

Registers a window event handler for all windows.

Examples

tauri::Builder::default()
  .on_window_event(|window, event| match event {
    tauri::WindowEvent::Focused(focused) => {
      // hide window whenever it loses focus
      if !focused {
        window.hide().unwrap();
      }
    }
    _ => {}
  });

pub fn on_webview_event<F: Fn(&Webview<R>, &WebviewEvent) + Send + Sync + 'static>( self, handler: F ) -> Self

Registers a webview event handler for all webviews.

Examples

tauri::Builder::default()
  .on_webview_event(|window, event| match event {
    tauri::WebviewEvent::DragDrop(event) => {
      println!("{:?}", event);
    }
    _ => {}
  });

pub fn register_uri_scheme_protocol<N: Into<String>, T: Into<Cow<'static, [u8]>>, H: Fn(&AppHandle<R>, Request<Vec<u8>>) -> Response<T> + Send + Sync + 'static>( self, uri_scheme: N, protocol: H ) -> Self

Registers a URI scheme protocol available to all webviews. Leverages setURLSchemeHandler on macOS, AddWebResourceRequestedFilter on Windows and webkit-web-context-register-uri-scheme on Linux.

Arguments

• uri_scheme The URI scheme to register, such as example.
• protocol the protocol associated with the given URI scheme. It’s a function that takes a request and returns a response.

Examples

tauri::Builder::default()
  .register_uri_scheme_protocol("app-files", |_app, request| {
    // skip leading `/`
    if let Ok(data) = std::fs::read(&request.uri().path()[1..]) {
      http::Response::builder()
        .body(data)
        .unwrap()
    } else {
      http::Response::builder()
        .status(http::StatusCode::BAD_REQUEST)
        .header(http::header::CONTENT_TYPE, mime::TEXT_PLAIN.essence_str())
        .body("failed to read file".as_bytes().to_vec())
        .unwrap()
    }
  });

pub fn register_asynchronous_uri_scheme_protocol<N: Into<String>, H: Fn(&AppHandle<R>, Request<Vec<u8>>, UriSchemeResponder) + Send + Sync + 'static>( self, uri_scheme: N, protocol: H ) -> Self

Similar to Self::register_uri_scheme_protocol but with an asynchronous responder that allows you to process the request in a separate thread and respond asynchronously.

Arguments

• uri_scheme The URI scheme to register, such as example.
• protocol the protocol associated with the given URI scheme. It’s a function that takes an URL such as example://localhost/asset.css.

Examples

tauri::Builder::default()
  .register_asynchronous_uri_scheme_protocol("app-files", |_app, request, responder| {
    // skip leading `/`
    let path = request.uri().path()[1..].to_string();
    std::thread::spawn(move || {
      if let Ok(data) = std::fs::read(path) {
        responder.respond(
          http::Response::builder()
            .body(data)
            .unwrap()
        );
      } else {
        responder.respond(
          http::Response::builder()
            .status(http::StatusCode::BAD_REQUEST)
            .header(http::header::CONTENT_TYPE, mime::TEXT_PLAIN.essence_str())
            .body("failed to read file".as_bytes().to_vec())
            .unwrap()
        );
    }
  });
  });

pub fn device_event_filter(self, filter: DeviceEventFilter) -> Self

Change the device event filter mode.

Since the DeviceEvent capture can lead to high CPU usage for unfocused windows, tao will ignore them by default for unfocused windows on Windows. This method allows changing the filter to explicitly capture them again.

Platform-specific

• ** Linux / macOS / iOS / Android**: Unsupported.

Examples

tauri::Builder::default()
  .device_event_filter(tauri::DeviceEventFilter::Always);

pub fn build(self, context: Context<R>) -> Result<App<R>>

Builds the application.

pub fn run(self, context: Context<R>) -> Result<()>

Runs the configured Tauri application.

Trait Implementations

impl Default for Builder<Wry>

Available on crate feature wry only.

Make Wry the default Runtime for Builder

fn default() -> Self

Returns the “default value” for a type.