[kbd] Implement keyboard and adapter

src/sdl_keyboard_adapter.rs

@@ -0,0 +1,34 @@
+use std::sync::mpsc::Sender;
+use crate::device::keyboard::{Keyboard, KeyboardEvent};
+use crate::device::keyboard::KeyboardEvent::{KeyDown, KeyUp};
+use crate::util::EmulatorResult;
+
+#[derive(Debug)]
+pub struct SdlKeyboardAdapter {
+    keyboard_event_sender: Sender<KeyboardEvent>,
+}
+
+impl SdlKeyboardAdapter {
+    fn new(keyboard_event_sender: Sender<KeyboardEvent>) -> SdlKeyboardAdapter {
+        SdlKeyboardAdapter {
+            keyboard_event_sender
+        }
+    }
+    /// Creates a paired keyboard and adapter.
+    pub fn new_keyboard()->(SdlKeyboardAdapter, Keyboard){
+        let (sender,receiver) = std::sync::mpsc::channel();
+        let sdl2_kb_adapter = Self::new(sender);
+        let device_kb = Keyboard::new(receiver);
+        (sdl2_kb_adapter,device_kb)
+    }
+
+    pub fn send_key_up(&self, keycode: u8) -> EmulatorResult<u8> {
+        self.keyboard_event_sender.send(KeyUp(keycode))?;
+        Ok(keycode)
+    }
+    pub fn send_key_down(&self, keycode: u8) -> EmulatorResult<u8> {
+        self.keyboard_event_sender.send(KeyDown(keycode))?;
+        Ok(keycode)
+    }
+
+}