refactor(core): add clipboard Cargo feature, enhancing binary size (#3957)

Author: lucasfernog

.changes/clipboard-feature.md

@@ -0,0 +1,7 @@
+---
+"tauri": patch
+"tauri-runtime": minor
+"tauri-runtime-wry": minor
+---
+
+**Breaking change::* Added the `clipboard` Cargo feature.

core/tauri-runtime-wry/Cargo.toml

@@ -42,3 +42,4 @@ objc-exception = [ "wry/objc-exception" ]
 gtk-tray = [ "wry/gtk-tray" ]
 ayatana-tray = [ "wry/ayatana-tray" ]
 global-shortcut = [ "tauri-runtime/global-shortcut" ]
+clipboard = [ "tauri-runtime/clipboard" ]

core/tauri-runtime-wry/src/clipboard.rs

@@ -0,0 +1,62 @@
+// Copyright 2019-2021 Tauri Programme within The Commons Conservancy
+// SPDX-License-Identifier: Apache-2.0
+// SPDX-License-Identifier: MIT
+
+//! Clipboard implementation.
+
+use crate::{getter, Context, Message};
+
+use std::sync::{
+  mpsc::{channel, Sender},
+  Arc, Mutex,
+};
+
+use tauri_runtime::{ClipboardManager, Result, UserEvent};
+pub use wry::application::clipboard::Clipboard;
+
+#[derive(Debug, Clone)]
+pub enum ClipboardMessage {
+  WriteText(String, Sender<()>),
+  ReadText(Sender<Option<String>>),
+}
+
+#[derive(Debug, Clone)]
+pub struct ClipboardManagerWrapper<T: UserEvent> {
+  pub context: Context<T>,
+}
+
+// SAFETY: this is safe since the `Context` usage is guarded on `send_user_message`.
+#[allow(clippy::non_send_fields_in_send_ty)]
+unsafe impl<T: UserEvent> Sync for ClipboardManagerWrapper<T> {}
+
+impl<T: UserEvent> ClipboardManager for ClipboardManagerWrapper<T> {
+  fn read_text(&self) -> Result<Option<String>> {
+    let (tx, rx) = channel();
+    getter!(self, rx, Message::Clipboard(ClipboardMessage::ReadText(tx)))
+  }
+
+  fn write_text<V: Into<String>>(&mut self, text: V) -> Result<()> {
+    let (tx, rx) = channel();
+    getter!(
+      self,
+      rx,
+      Message::Clipboard(ClipboardMessage::WriteText(text.into(), tx))
+    )?;
+    Ok(())
+  }
+}
+
+pub fn handle_clipboard_message(
+  message: ClipboardMessage,
+  clipboard_manager: &Arc<Mutex<Clipboard>>,
+) {
+  match message {
+    ClipboardMessage::WriteText(text, tx) => {
+      clipboard_manager.lock().unwrap().write_text(text);
+      tx.send(()).unwrap();
+    }
+    ClipboardMessage::ReadText(tx) => tx
+      .send(clipboard_manager.lock().unwrap().read_text())
+      .unwrap(),
+  }
+}