Added menu functionality. (#58)

* Added core::Channel and menu functionality. core::Channel may leak memory.

* Added leptos example.

examples/leptos/src-tauri/.gitignore

@@ -0,0 +1,7 @@
+# Generated by Cargo
+# will have compiled files and executables
+/target/
+
+# Generated by Tauri
+# will have schema files for capabilities auto-completion
+/gen/schemas

examples/leptos/src-tauri/Cargo.toml

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+[package]
+name = "test-tauri-events"
+version = "0.0.0"
+description = "A Tauri App"
+authors = ["you"]
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[build-dependencies]
+# tauri-build = { version = "2.0.0-beta", features = [] }
+tauri-build = { path = "../../tauri/core/tauri-build", features = [] }
+
+[dependencies]
+tauri = { path = "../../tauri/core/tauri", features = [] }
+tauri-plugin-shell = { path = "../../plugins-workspace/plugins/shell" }
+serde = { version = "1", features = ["derive"] }
+serde_json = "1"
+tracing = "0.1.40"
+tracing-subscriber = "0.3.18"

examples/leptos/src-tauri/build.rs

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+fn main() {
+    tauri_build::build()
+}

examples/leptos/src-tauri/capabilities/default.json

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+{
+  "$schema": "../gen/schemas/desktop-schema.json",
+  "identifier": "default",
+  "description": "Capability for the main window",
+  "windows": ["main"],
+  "permissions": [
+    "core:path:default",
+    "core:event:default",
+    "core:window:default",
+    "core:app:default",
+    "core:image:default",
+    "core:resources:default",
+    "core:menu:default",
+    "core:tray:default",
+    "shell:allow-open"
+  ]
+}

examples/leptos/src-tauri/src/main.rs

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+// Prevents additional console window on Windows in release, DO NOT REMOVE!!
+#![cfg_attr(not(debug_assertions), windows_subsystem = "windows")]
+
+use tauri::{Emitter, Manager};
+
+fn main() {
+    logging::enable();
+    tauri::Builder::default()
+        .invoke_handler(tauri::generate_handler![trigger_listen_events,])
+        .run(tauri::generate_context!())
+        .expect("error while running tauri application");
+}
+
+#[tauri::command]
+fn trigger_listen_events(app: tauri::AppHandle) {
+    tracing::debug!("trigger_listen_event");
+    std::thread::spawn({
+        move || {
+            for i in 1..=100 {
+                app.emit("event::listen", i).unwrap();
+                std::thread::sleep(std::time::Duration::from_millis(500));
+            }
+        }
+    });
+}
+
+mod logging {
+    use tracing_subscriber::{filter::LevelFilter, fmt, prelude::*, Layer, Registry};
+
+    const MAX_LOG_LEVEL: LevelFilter = LevelFilter::DEBUG;
+
+    pub fn enable() {
+        let console_logger = fmt::layer()
+            .with_writer(std::io::stdout)
+            .pretty()
+            .with_filter(MAX_LOG_LEVEL);
+
+        let subscriber = Registry::default().with(console_logger);
+        tracing::subscriber::set_global_default(subscriber).unwrap();
+    }
+}

examples/leptos/src-tauri/tauri.conf.json

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+{
+  "productName": "test-tauri-events",
+  "version": "0.0.0",
+  "identifier": "com.tauri.dev",
+  "build": {
+    "beforeDevCommand": "trunk serve",
+    "devUrl": "http://localhost:1420",
+    "beforeBuildCommand": "trunk build",
+    "frontendDist": "../dist"
+  },
+  "app": {
+    "withGlobalTauri": true,
+    "windows": [
+      {
+        "title": "test-tauri-events",
+        "width": 800,
+        "height": 600
+      }
+    ],
+    "security": {
+      "csp": null
+    }
+  },
+  "bundle": {
+    "active": true,
+    "targets": "all",
+    "icon": [
+      "icons/32x32.png",
+      "icons/128x128.png",
+      "icons/128x128@2x.png",
+      "icons/icon.icns",
+      "icons/icon.ico"
+    ]
+  }
+}