refact: flutter keyboard, map mode (#9160)

Signed-off-by: fufesou <linlong1266@gmail.com>

src/flutter_ffi.rs

@@ -491,9 +491,8 @@ pub fn session_switch_display(is_desktop: bool, session_id: SessionID, value: Ve
 
 pub fn session_handle_flutter_key_event(
     session_id: SessionID,
-    name: String,
-    platform_code: i32,
-    position_code: i32,
+    character: String,
+    usb_hid: i32,
     lock_modes: i32,
     down_or_up: bool,
 ) {
@@ -501,9 +500,8 @@ pub fn session_handle_flutter_key_event(
         let keyboard_mode = session.get_keyboard_mode();
         session.handle_flutter_key_event(
             &keyboard_mode,
-            &name,
-            platform_code,
-            position_code,
+            &character,
+            usb_hid,
             lock_modes,
             down_or_up,
         );

src/ui_session_interface.rs

@@ -803,19 +803,18 @@ impl<T: InvokeUiSession> Session<T> {
     pub fn handle_flutter_key_event(
         &self,
         keyboard_mode: &str,
-        name: &str,
-        platform_code: i32,
-        position_code: i32,
+        character: &str,
+        usb_hid: i32,
         lock_modes: i32,
         down_or_up: bool,
     ) {
-        if name == "flutter_key" {
-            self._handle_key_flutter_simulation(keyboard_mode, platform_code, down_or_up);
+        if character == "flutter_key" {
+            self._handle_key_flutter_simulation(keyboard_mode, usb_hid, down_or_up);
         } else {
             self._handle_key_non_flutter_simulation(
                 keyboard_mode,
-                platform_code,
-                position_code,
+                character,
+                usb_hid,
                 lock_modes,
                 down_or_up,
             );
@@ -831,10 +830,10 @@ impl<T: InvokeUiSession> Session<T> {
     ) {
         // https://github.com/flutter/flutter/blob/master/packages/flutter/lib/src/services/keyboard_key.g.dart#L4356
         let ctrl_key = match platform_code {
-            0x0007007f => Some(ControlKey::VolumeMute),
-            0x00070080 => Some(ControlKey::VolumeUp),
-            0x00070081 => Some(ControlKey::VolumeDown),
-            0x00070066 => Some(ControlKey::Power),
+            0x007f => Some(ControlKey::VolumeMute),
+            0x0080 => Some(ControlKey::VolumeUp),
+            0x0081 => Some(ControlKey::VolumeDown),
+            0x0066 => Some(ControlKey::Power),
             _ => None,
         };
         let Some(ctrl_key) = ctrl_key else { return };
@@ -851,22 +850,28 @@ impl<T: InvokeUiSession> Session<T> {
     fn _handle_key_non_flutter_simulation(
         &self,
         keyboard_mode: &str,
-        platform_code: i32,
-        position_code: i32,
+        character: &str,
+        usb_hid: i32,
         lock_modes: i32,
         down_or_up: bool,
     ) {
-        if position_code < 0 || platform_code < 0 {
-            return;
-        }
-        let platform_code: u32 = platform_code as _;
-        let position_code: KeyCode = position_code as _;
+        let key = rdev::usb_hid_key_from_code(usb_hid as _);
+
+        #[cfg(target_os = "windows")]
+        let platform_code: u32 = rdev::win_code_from_key(key).unwrap_or(0);
+        #[cfg(target_os = "windows")]
+        let position_code: KeyCode = rdev::win_scancode_from_key(key).unwrap_or(0) as _;
 
         #[cfg(not(target_os = "windows"))]
-        let key = rdev::key_from_code(position_code) as rdev::Key;
-        // Windows requires special handling
-        #[cfg(target_os = "windows")]
-        let key = rdev::get_win_key(platform_code, position_code);
+        let position_code: KeyCode = rdev::code_from_key(key).unwrap_or(0) as _;
+        #[cfg(not(any(target_os = "windows", target_os = "linux")))]
+        let platform_code: u32 = position_code as _;
+        // For translate mode.
+        // We need to set the platform code (keysym) if is AltGr.
+        // https://github.com/rustdesk/rustdesk/blob/07cf1b4db5ef2f925efd3b16b87c33ce03c94809/src/keyboard.rs#L1029
+        // https://github.com/flutter/flutter/issues/153811
+        #[cfg(target_os = "linux")] 
+        let platform_code: u32 = position_code as _;
 
         let event_type = if down_or_up {
             KeyPress(key)
@@ -875,7 +880,16 @@ impl<T: InvokeUiSession> Session<T> {
         };
         let event = Event {
             time: SystemTime::now(),
-            unicode: None,
+            unicode: if character.is_empty() {
+                None
+            } else {
+                Some(rdev::UnicodeInfo {
+                    name: Some(character.to_string()),
+                    unicode: character.encode_utf16().collect(),
+                    // is_dead: is not correct here, because flutter cannot detect deadcode for now.
+                    is_dead: false,
+                })
+            },
             platform_code,
             position_code: position_code as _,
             event_type,