Merge pull request #3675 from 21pages/view_mode

client side view mode

flutter/lib/desktop/pages/desktop_setting_page.dart

@@ -1318,6 +1318,7 @@ class _DisplayState extends State<_Display> {
 
   Widget other(BuildContext context) {
     return _Card(title: 'Other Default Options', children: [
+      otherRow('View Mode', 'view-only'),
       otherRow('show_monitors_tip', 'show_monitors_toolbar'),
       otherRow('Show remote cursor', 'show_remote_cursor'),
       otherRow('Zoom cursor', 'zoom-cursor'),

flutter/lib/desktop/pages/remote_page.dart

@@ -139,8 +139,9 @@ class _RemotePageState extends State<RemotePage>
     _ffi.ffiModel.updateEventListener(widget.id);
     _ffi.qualityMonitorModel.checkShowQualityMonitor(widget.id);
     // Session option should be set after models.dart/FFI.start
-    _showRemoteCursor.value = bind.sessionGetToggleOptionSync(
+    // _showRemoteCursor has been set by setViewOnly
-        id: widget.id, arg: 'show-remote-cursor');
+    _ffi.ffiModel.setViewOnly(widget.id,
+        bind.sessionGetToggleOptionSync(id: widget.id, arg: 'view-only'));
     _zoomCursor.value =
         bind.sessionGetToggleOptionSync(id: widget.id, arg: 'zoom-cursor');
     DesktopMultiWindow.addListener(this);

flutter/lib/desktop/widgets/remote_toolbar.dart

@@ -385,6 +385,7 @@ class _RemoteMenubarState extends State<RemoteMenubar> {
   }
 
   Widget _buildToolbar(BuildContext context) {
+    final ffiModel = Provider.of<FfiModel>(context);
     final List<Widget> toolbarItems = [];
     if (!isWebDesktop) {
       toolbarItems.add(_PinMenu(state: widget.state));
@@ -410,7 +411,9 @@ class _RemoteMenubarState extends State<RemoteMenubar> {
       state: widget.state,
       setFullscreen: _setFullscreen,
     ));
-    toolbarItems.add(_KeyboardMenu(id: widget.id, ffi: widget.ffi));
+    if (!ffiModel.viewOnly) {
+      toolbarItems.add(_KeyboardMenu(id: widget.id, ffi: widget.ffi));
+    }
     if (!isWeb) {
       toolbarItems.add(_ChatMenu(id: widget.id, ffi: widget.ffi));
       toolbarItems.add(_VoiceCallMenu(id: widget.id, ffi: widget.ffi));
@@ -820,8 +823,10 @@ class _ControlMenu extends StatelessWidget {
 
   ctrlAltDel() {
     final perms = ffi.ffiModel.permissions;
+    final viewOnly = ffi.ffiModel.viewOnly;
     final pi = ffi.ffiModel.pi;
-    final visible = perms['keyboard'] != false &&
+    final visible = !viewOnly &&
+        perms['keyboard'] != false &&
         (pi.platform == kPeerPlatformLinux || pi.sasEnabled);
     if (!visible) return Offstage();
     return _MenuItemButton(
@@ -846,7 +851,8 @@ class _ControlMenu extends StatelessWidget {
 
   insertLock() {
     final perms = ffi.ffiModel.permissions;
-    final visible = perms['keyboard'] != false;
+    final viewOnly = ffi.ffiModel.viewOnly;
+    final visible = !viewOnly && perms['keyboard'] != false;
     if (!visible) return Offstage();
     return _MenuItemButton(
         child: Text(translate('Insert Lock')),
@@ -963,6 +969,7 @@ class _DisplayMenuState extends State<_DisplayMenu> {
           codec(),
           resolutions(),
           Divider(),
+          view_only(),
           showRemoteCursor(),
           zoomCursor(),
           showQualityMonitor(),
@@ -1456,11 +1463,28 @@ class _DisplayMenuState extends State<_DisplayMenu> {
         child: Text(translate("Resolution")));
   }
 
+  view_only() {
+    final visible = version_cmp(pi.version, '1.2.0') >= 0;
+    if (!visible) return Offstage();
+    final ffiModel = widget.ffi.ffiModel;
+    return _CheckboxMenuButton(
+        value: ffiModel.viewOnly,
+        onChanged: (value) async {
+          if (value == null) return;
+          bind.sessionSetViewOnly(id: widget.id, viewOnly: value);
+          ffiModel.setViewOnly(widget.id, value);
+        },
+        ffi: widget.ffi,
+        child: Text(translate('View Mode')));
+  }
+
   showRemoteCursor() {
     if (widget.ffi.ffiModel.pi.platform == kPeerPlatformAndroid) {
       return Offstage();
     }
-    final visible = !widget.ffi.canvasModel.cursorEmbedded;
+    final ffiModel = widget.ffi.ffiModel;
+    final visible =
+        !ffiModel.viewOnly && !widget.ffi.canvasModel.cursorEmbedded;
     if (!visible) return Offstage();
     final state = ShowRemoteCursorState.find(widget.id);
     final option = 'show-remote-cursor';
@@ -1543,7 +1567,10 @@ class _DisplayMenuState extends State<_DisplayMenu> {
   }
 
   disableClipboard() {
-    final visible = perms['keyboard'] != false && perms['clipboard'] != false;
+    final ffiModel = widget.ffi.ffiModel;
+    final visible = perms['keyboard'] != false &&
+        perms['clipboard'] != false &&
+        !ffiModel.viewOnly;
     if (!visible) return Offstage();
     final option = 'disable-clipboard';
     final value = bind.sessionGetToggleOptionSync(id: widget.id, arg: option);

flutter/lib/models/model.dart

@@ -47,6 +47,7 @@ class FfiModel with ChangeNotifier {
   bool _touchMode = false;
   Timer? _timer;
   var _reconnects = 1;
+  bool _viewOnly = false;
   WeakReference<FFI> parent;
 
   Map<String, bool> get permissions => _permissions;
@@ -65,6 +66,8 @@ class FfiModel with ChangeNotifier {
 
   bool get isPeerAndroid => _pi.platform == kPeerPlatformAndroid;
 
+  bool get viewOnly => _viewOnly;
+
   set inputBlocked(v) {
     _inputBlocked = v;
   }
@@ -373,7 +376,8 @@ class FfiModel with ChangeNotifier {
   _updateSessionWidthHeight(String id) {
     parent.target?.canvasModel.updateViewStyle();
     if (display.width <= 0 || display.height <= 0) {
-      debugPrintStack(label: 'invalid display size (${display.width},${display.height})');
+      debugPrintStack(
+          label: 'invalid display size (${display.width},${display.height})');
     } else {
       bind.sessionSetSize(id: id, width: display.width, height: display.height);
     }
@@ -516,6 +520,19 @@ class FfiModel with ChangeNotifier {
       //
     }
   }
+
+  void setViewOnly(String id, bool value) {
+    if (value) {
+      ShowRemoteCursorState.find(id).value = value;
+    } else {
+      ShowRemoteCursorState.find(id).value =
+          bind.sessionGetToggleOptionSync(id: id, arg: 'show-remote-cursor');
+    }
+    if (_viewOnly != value) {
+      _viewOnly = value;
+      notifyListeners();
+    }
+  }
 }
 
 class ImageModel with ChangeNotifier {

libs/hbb_common/protos/message.proto

@@ -487,6 +487,7 @@ message OptionMessage {
   BoolOption enable_file_transfer = 9;
   VideoCodecState video_codec_state = 10;
   int32 custom_fps = 11;
+  BoolOption disable_keyboard = 12;
 }
 
 message TestDelay {

libs/hbb_common/src/config.rs

@@ -1061,6 +1061,10 @@ impl PeerConfig {
         if !mp.contains_key(key) {
             mp.insert(key.to_owned(), UserDefaultConfig::read().get(key));
         }
+        key = "view-only";
+        if !mp.contains_key(key) {
+            mp.insert(key.to_owned(), UserDefaultConfig::read().get(key));
+        }
         Ok(mp)
     }
 }

src/client.rs

@@ -1296,7 +1296,12 @@ impl LoginConfigHandler {
         if let Some(custom_fps) = self.options.get("custom-fps") {
             msg.custom_fps = custom_fps.parse().unwrap_or(30);
         }
-        if self.get_toggle_option("show-remote-cursor") {
+        let view_only = self.get_toggle_option("view-only");
+        if view_only {
+            msg.disable_keyboard = BoolOption::Yes.into();
+            n += 1;
+        }
+        if view_only || self.get_toggle_option("show-remote-cursor") {
             msg.show_remote_cursor = BoolOption::Yes.into();
             n += 1;
         }
@@ -1312,7 +1317,7 @@ impl LoginConfigHandler {
             msg.enable_file_transfer = BoolOption::Yes.into();
             n += 1;
         }
-        if self.get_toggle_option("disable-clipboard") {
+        if view_only || self.get_toggle_option("disable-clipboard") {
             msg.disable_clipboard = BoolOption::Yes.into();
             n += 1;
         }

src/flutter_ffi.rs

@@ -543,6 +543,12 @@ pub fn session_set_size(_id: String, _width: i32, _height: i32) {
     }
 }
 
+pub fn session_set_view_only(id: String, view_only: bool) {
+    if let Some(session) = SESSIONS.read().unwrap().get(&id) {
+        session.set_view_only(view_only);
+    }
+}
+
 pub fn main_get_sound_inputs() -> Vec<String> {
     #[cfg(not(any(target_os = "android", target_os = "ios")))]
     return get_sound_inputs();

src/lang/ca.rs

@@ -479,5 +479,6 @@ pub static ref T: std::collections::HashMap<&'static str, &'static str> =
         ("Me", ""),
         ("identical_file_tip", ""),
         ("show_monitors_tip", ""),
+        ("View Mode", ""),
     ].iter().cloned().collect();
 }

src/lang/cn.rs

@@ -479,5 +479,6 @@ pub static ref T: std::collections::HashMap<&'static str, &'static str> =
         ("Me", ""),
         ("identical_file_tip", "此文件与对方的一致"),
         ("show_monitors_tip", ""),
+        ("View Mode", "浏览模式"),
     ].iter().cloned().collect();
 }

src/lang/cs.rs

@@ -479,5 +479,6 @@ pub static ref T: std::collections::HashMap<&'static str, &'static str> =
         ("Me", ""),
         ("identical_file_tip", ""),
         ("show_monitors_tip", ""),
+        ("View Mode", ""),
     ].iter().cloned().collect();
 }

src/lang/da.rs

@@ -479,5 +479,6 @@ pub static ref T: std::collections::HashMap<&'static str, &'static str> =
         ("Me", "Mig"),
         ("identical_file_tip", ""),
         ("show_monitors_tip", ""),
+        ("View Mode", ""),
     ].iter().cloned().collect();
 }

src/lang/de.rs

@@ -479,5 +479,6 @@ pub static ref T: std::collections::HashMap<&'static str, &'static str> =
         ("Me", "Ich"),
         ("identical_file_tip", ""),
         ("show_monitors_tip", ""),
+        ("View Mode", ""),
     ].iter().cloned().collect();
 }

src/lang/el.rs

@@ -479,5 +479,6 @@ pub static ref T: std::collections::HashMap<&'static str, &'static str> =
         ("Me", ""),
         ("identical_file_tip", ""),
         ("show_monitors_tip", ""),
+        ("View Mode", ""),
     ].iter().cloned().collect();
 }

src/lang/eo.rs

@@ -479,5 +479,6 @@ pub static ref T: std::collections::HashMap<&'static str, &'static str> =
         ("Me", ""),
         ("identical_file_tip", ""),
         ("show_monitors_tip", ""),
+        ("View Mode", ""),
     ].iter().cloned().collect();
 }

src/lang/es.rs

@@ -479,5 +479,6 @@ pub static ref T: std::collections::HashMap<&'static str, &'static str> =
         ("Me", "Yo"),
         ("identical_file_tip", ""),
         ("show_monitors_tip", ""),
+        ("View Mode", ""),
     ].iter().cloned().collect();
 }

src/lang/fa.rs

@@ -479,5 +479,6 @@ pub static ref T: std::collections::HashMap<&'static str, &'static str> =
         ("Me", "من"),
         ("identical_file_tip", "این فایل با فایل همتا یکسان است."),
         ("show_monitors_tip", "نمایش مانیتورها در نوار ابزار"),
+        ("View Mode", ""),
     ].iter().cloned().collect();
 }

src/lang/fr.rs

@@ -479,5 +479,6 @@ pub static ref T: std::collections::HashMap<&'static str, &'static str> =
         ("Me", ""),
         ("identical_file_tip", ""),
         ("show_monitors_tip", ""),
+        ("View Mode", ""),
     ].iter().cloned().collect();
 }

src/lang/hu.rs

@@ -479,5 +479,6 @@ pub static ref T: std::collections::HashMap<&'static str, &'static str> =
         ("Me", ""),
         ("identical_file_tip", ""),
         ("show_monitors_tip", ""),
+        ("View Mode", ""),
     ].iter().cloned().collect();
 }

src/lang/id.rs

@@ -479,5 +479,6 @@ pub static ref T: std::collections::HashMap<&'static str, &'static str> =
         ("Me", ""),
         ("identical_file_tip", ""),
         ("show_monitors_tip", ""),
+        ("View Mode", ""),
     ].iter().cloned().collect();
 }

src/lang/it.rs

@@ -479,5 +479,6 @@ pub static ref T: std::collections::HashMap<&'static str, &'static str> =
         ("Me", "Io"),
         ("identical_file_tip", "Questo file è identico a quello del peer."),
         ("show_monitors_tip", "Mostra schermi nella barra degli strumenti"),
+        ("View Mode", ""),
     ].iter().cloned().collect();
 }

src/lang/ja.rs

@@ -479,5 +479,6 @@ pub static ref T: std::collections::HashMap<&'static str, &'static str> =
         ("Me", ""),
         ("identical_file_tip", ""),
         ("show_monitors_tip", ""),
+        ("View Mode", ""),
     ].iter().cloned().collect();
 }

src/lang/ko.rs

@@ -479,5 +479,6 @@ pub static ref T: std::collections::HashMap<&'static str, &'static str> =
         ("Me", ""),
         ("identical_file_tip", ""),
         ("show_monitors_tip", ""),
+        ("View Mode", ""),
     ].iter().cloned().collect();
 }

src/lang/kz.rs

@@ -479,5 +479,6 @@ pub static ref T: std::collections::HashMap<&'static str, &'static str> =
         ("Me", ""),
         ("identical_file_tip", ""),
         ("show_monitors_tip", ""),
+        ("View Mode", ""),
     ].iter().cloned().collect();
 }

src/lang/nl.rs

@@ -479,5 +479,6 @@ pub static ref T: std::collections::HashMap<&'static str, &'static str> =
         ("Me", ""),
         ("identical_file_tip", ""),
         ("show_monitors_tip", ""),
+        ("View Mode", ""),
     ].iter().cloned().collect();
 }

src/lang/pl.rs

@@ -479,5 +479,6 @@ pub static ref T: std::collections::HashMap<&'static str, &'static str> =
         ("Me", ""),
         ("identical_file_tip", ""),
         ("show_monitors_tip", ""),
+        ("View Mode", ""),
     ].iter().cloned().collect();
 }

src/lang/pt_PT.rs

@@ -479,5 +479,6 @@ pub static ref T: std::collections::HashMap<&'static str, &'static str> =
         ("Me", ""),
         ("identical_file_tip", ""),
         ("show_monitors_tip", ""),
+        ("View Mode", ""),
     ].iter().cloned().collect();
 }

src/lang/ptbr.rs

@@ -479,5 +479,6 @@ pub static ref T: std::collections::HashMap<&'static str, &'static str> =
         ("Me", ""),
         ("identical_file_tip", ""),
         ("show_monitors_tip", ""),
+        ("View Mode", ""),
     ].iter().cloned().collect();
 }

src/lang/ro.rs

@@ -479,5 +479,6 @@ pub static ref T: std::collections::HashMap<&'static str, &'static str> =
         ("Me", ""),
         ("identical_file_tip", ""),
         ("show_monitors_tip", ""),
+        ("View Mode", ""),
     ].iter().cloned().collect();
 }

src/lang/ru.rs

@@ -479,5 +479,6 @@ pub static ref T: std::collections::HashMap<&'static str, &'static str> =
         ("Me", ""),
         ("identical_file_tip", ""),
         ("show_monitors_tip", ""),
+        ("View Mode", ""),
     ].iter().cloned().collect();
 }

src/lang/sk.rs

@@ -479,5 +479,6 @@ pub static ref T: std::collections::HashMap<&'static str, &'static str> =
         ("Me", ""),
         ("identical_file_tip", ""),
         ("show_monitors_tip", ""),
+        ("View Mode", ""),
     ].iter().cloned().collect();
 }

src/lang/sl.rs

@@ -479,5 +479,6 @@ pub static ref T: std::collections::HashMap<&'static str, &'static str> =
         ("Me", ""),
         ("identical_file_tip", ""),
         ("show_monitors_tip", ""),
+        ("View Mode", ""),
     ].iter().cloned().collect();
 }

src/lang/sq.rs

@@ -479,5 +479,6 @@ pub static ref T: std::collections::HashMap<&'static str, &'static str> =
         ("Me", ""),
         ("identical_file_tip", ""),
         ("show_monitors_tip", ""),
+        ("View Mode", ""),
     ].iter().cloned().collect();
 }

src/lang/sr.rs

@@ -479,5 +479,6 @@ pub static ref T: std::collections::HashMap<&'static str, &'static str> =
         ("Me", ""),
         ("identical_file_tip", ""),
         ("show_monitors_tip", ""),
+        ("View Mode", ""),
     ].iter().cloned().collect();
 }

src/lang/sv.rs

@@ -479,5 +479,6 @@ pub static ref T: std::collections::HashMap<&'static str, &'static str> =
         ("Me", ""),
         ("identical_file_tip", ""),
         ("show_monitors_tip", ""),
+        ("View Mode", ""),
     ].iter().cloned().collect();
 }

src/lang/template.rs

@@ -479,5 +479,6 @@ pub static ref T: std::collections::HashMap<&'static str, &'static str> =
         ("Me", ""),
         ("identical_file_tip", ""),
         ("show_monitors_tip", ""),
+        ("View Mode", ""),
     ].iter().cloned().collect();
 }

src/lang/th.rs

@@ -479,5 +479,6 @@ pub static ref T: std::collections::HashMap<&'static str, &'static str> =
         ("Me", ""),
         ("identical_file_tip", ""),
         ("show_monitors_tip", ""),
+        ("View Mode", ""),
     ].iter().cloned().collect();
 }

src/lang/tr.rs

@@ -479,5 +479,6 @@ pub static ref T: std::collections::HashMap<&'static str, &'static str> =
         ("Me", ""),
         ("identical_file_tip", ""),
         ("show_monitors_tip", ""),
+        ("View Mode", ""),
     ].iter().cloned().collect();
 }

src/lang/tw.rs

@@ -479,5 +479,6 @@ pub static ref T: std::collections::HashMap<&'static str, &'static str> =
         ("Me", ""),
         ("identical_file_tip", ""),
         ("show_monitors_tip", ""),
+        ("View Mode", "瀏覽模式"),
     ].iter().cloned().collect();
 }

src/lang/ua.rs

@@ -479,5 +479,6 @@ pub static ref T: std::collections::HashMap<&'static str, &'static str> =
         ("Me", ""),
         ("identical_file_tip", ""),
         ("show_monitors_tip", ""),
+        ("View Mode", ""),
     ].iter().cloned().collect();
 }

src/lang/vn.rs

@@ -479,5 +479,6 @@ pub static ref T: std::collections::HashMap<&'static str, &'static str> =
         ("Me", ""),
         ("identical_file_tip", ""),
         ("show_monitors_tip", ""),
+        ("View Mode", ""),
     ].iter().cloned().collect();
 }

src/server/connection.rs

@@ -103,6 +103,9 @@ pub struct Connection {
     show_remote_cursor: bool,
     // by peer
     ip: String,
+    // by peer
+    disable_keyboard: bool,
+    // by peer
     disable_clipboard: bool,
     // by peer
     disable_audio: bool,
@@ -219,6 +222,7 @@ impl Connection {
             disable_audio: false,
             enable_file_transfer: false,
             disable_clipboard: false,
+            disable_keyboard: false,
             tx_input,
             video_ack_required: false,
             peer_info: Default::default(),
@@ -327,7 +331,7 @@ impl Connection {
                                 if let Some(s) = conn.server.upgrade() {
                                     s.write().unwrap().subscribe(
                                         super::clipboard_service::NAME,
-                                        conn.inner.clone(), conn.clipboard_enabled() && conn.keyboard);
+                                        conn.inner.clone(), conn.clipboard_enabled() && conn.peer_keyboard_enabled());
                                 }
                             } else if &name == "audio" {
                                 conn.audio = enabled;
@@ -939,13 +943,13 @@ impl Connection {
         } else if sub_service {
             if let Some(s) = self.server.upgrade() {
                 let mut noperms = Vec::new();
-                if !self.keyboard && !self.show_remote_cursor {
+                if !self.peer_keyboard_enabled() && !self.show_remote_cursor {
                     noperms.push(NAME_CURSOR);
                 }
                 if !self.show_remote_cursor {
                     noperms.push(NAME_POS);
                 }
-                if !self.clipboard_enabled() || !self.keyboard {
+                if !self.clipboard_enabled() || !self.peer_keyboard_enabled() {
                     noperms.push(super::clipboard_service::NAME);
                 }
                 if !self.audio_enabled() {
@@ -959,6 +963,10 @@ impl Connection {
         }
     }
 
+    fn peer_keyboard_enabled(&self) -> bool {
+        self.keyboard && !self.disable_keyboard
+    }
+
     fn clipboard_enabled(&self) -> bool {
         self.clipboard && !self.disable_clipboard
     }
@@ -1312,7 +1320,7 @@ impl Connection {
                         log::debug!("call_main_service_mouse_input fail:{}", e);
                     }
                     #[cfg(not(any(target_os = "android", target_os = "ios")))]
-                    if self.keyboard {
+                    if self.peer_keyboard_enabled() {
                         if is_left_up(&me) {
                             CLICK_TIME.store(get_time(), Ordering::SeqCst);
                         } else {
@@ -1323,7 +1331,7 @@ impl Connection {
                 }
                 Some(message::Union::KeyEvent(me)) => {
                     #[cfg(not(any(target_os = "android", target_os = "ios")))]
-                    if self.keyboard {
+                    if self.peer_keyboard_enabled() {
                         if is_enter(&me) {
                             CLICK_TIME.store(get_time(), Ordering::SeqCst);
                         }
@@ -1750,7 +1758,7 @@ impl Connection {
                     s.write().unwrap().subscribe(
                         NAME_CURSOR,
                         self.inner.clone(),
-                        self.keyboard || self.show_remote_cursor,
+                        self.peer_keyboard_enabled() || self.show_remote_cursor,
                     );
                     s.write().unwrap().subscribe(
                         NAME_POS,
@@ -1788,7 +1796,24 @@ impl Connection {
                     s.write().unwrap().subscribe(
                         super::clipboard_service::NAME,
                         self.inner.clone(),
-                        self.clipboard_enabled() && self.keyboard,
+                        self.clipboard_enabled() && self.peer_keyboard_enabled(),
+                    );
+                }
+            }
+        }
+        if let Ok(q) = o.disable_keyboard.enum_value() {
+            if q != BoolOption::NotSet {
+                self.disable_keyboard = q == BoolOption::Yes;
+                if let Some(s) = self.server.upgrade() {
+                    s.write().unwrap().subscribe(
+                        super::clipboard_service::NAME,
+                        self.inner.clone(),
+                        self.clipboard_enabled() && self.peer_keyboard_enabled(),
+                    );
+                    s.write().unwrap().subscribe(
+                        NAME_CURSOR,
+                        self.inner.clone(),
+                        self.peer_keyboard_enabled() || self.show_remote_cursor,
                     );
                 }
             }

src/ui_session_interface.rs

@@ -10,6 +10,7 @@ use std::time::{Duration, SystemTime};
 
 use async_trait::async_trait;
 use bytes::Bytes;
+use hbb_common::message_proto::option_message::BoolOption;
 use rdev::{Event, EventType::*};
 use uuid::Uuid;
 
@@ -374,7 +375,6 @@ impl<T: InvokeUiSession> Session<T> {
     }
 
     pub fn swab_modifier_key(&self, msg: &mut KeyEvent) {
-
         let allow_swap_key = self.get_toggle_option("allow_swap_key".to_string());
         if allow_swap_key {
             if let Some(key_event::Union::ControlKey(ck)) = msg.union {
@@ -388,19 +388,22 @@ impl<T: InvokeUiSession> Session<T> {
                 };
                 msg.set_control_key(ck);
             }
-            msg.modifiers = msg.modifiers.iter().map(|ck| {
+            msg.modifiers = msg
-                let ck = ck.enum_value_or_default();
+                .modifiers
-                let ck = match ck {
+                .iter()
-                    ControlKey::Control => ControlKey::Meta,
+                .map(|ck| {
-                    ControlKey::Meta => ControlKey::Control,
+                    let ck = ck.enum_value_or_default();
-                    ControlKey::RControl => ControlKey::Meta,
+                    let ck = match ck {
-                    ControlKey::RWin => ControlKey::Control,
+                        ControlKey::Control => ControlKey::Meta,
-                    _ => ck,
+                        ControlKey::Meta => ControlKey::Control,
-                };
+                        ControlKey::RControl => ControlKey::Meta,
-                hbb_common::protobuf::EnumOrUnknown::new(ck)
+                        ControlKey::RWin => ControlKey::Control,
-            }).collect();
+                        _ => ck,
-            
+                    };
-        
+                    hbb_common::protobuf::EnumOrUnknown::new(ck)
+                })
+                .collect();
+
             let code = msg.chr();
             if code != 0 {
                 let mut peer = self.peer_platform().to_lowercase();
@@ -444,7 +447,6 @@ impl<T: InvokeUiSession> Session<T> {
                 msg.set_chr(key);
             }
         }
-
     }
 
     pub fn send_key_event(&self, evt: &KeyEvent) {
@@ -841,6 +843,37 @@ impl<T: InvokeUiSession> Session<T> {
         }
         false
     }
+
+    pub fn set_view_only(&self, view_only: bool) {
+        let mut option = OptionMessage::default();
+        let f = |b: bool| {
+            if b {
+                BoolOption::Yes.into()
+            } else {
+                BoolOption::No.into()
+            }
+        };
+        if view_only {
+            option.disable_keyboard = f(true);
+            option.disable_clipboard = f(true);
+            option.show_remote_cursor = f(true);
+        } else {
+            option.disable_keyboard = f(false);
+            option.disable_clipboard = f(self.get_toggle_option("disable-clipboard".to_string()));
+            option.show_remote_cursor = f(self.get_toggle_option("show-remote-cursor".to_string()));
+        }
+        let mut misc = Misc::new();
+        misc.set_option(option);
+        let mut msg = Message::new();
+        msg.set_misc(misc);
+        self.send(Data::Message(msg));
+        if self.get_toggle_option("view-only".to_string()) != view_only {
+            self.lc
+                .write()
+                .unwrap()
+                .toggle_option("view-only".to_string());
+        }
+    }
 }
 
 pub trait InvokeUiSession: Send + Sync + Clone + 'static + Sized + Default {
@@ -1011,21 +1044,25 @@ impl<T: InvokeUiSession> Interface for Session<T> {
             handle_test_delay(t, peer).await;
         }
     }
-    
+
-    fn swap_modifier_mouse(&self, msg : &mut hbb_common::protos::message::MouseEvent) {
+    fn swap_modifier_mouse(&self, msg: &mut hbb_common::protos::message::MouseEvent) {
         let allow_swap_key = self.get_toggle_option("allow_swap_key".to_string());
-        if allow_swap_key  {
+        if allow_swap_key {
-            msg.modifiers = msg.modifiers.iter().map(|ck| {
+            msg.modifiers = msg
-                let ck = ck.enum_value_or_default();
+                .modifiers
-                let ck = match ck {
+                .iter()
-                    ControlKey::Control => ControlKey::Meta,
+                .map(|ck| {
-                    ControlKey::Meta => ControlKey::Control,
+                    let ck = ck.enum_value_or_default();
-                    ControlKey::RControl => ControlKey::Meta,
+                    let ck = match ck {
-                    ControlKey::RWin => ControlKey::Control,
+                        ControlKey::Control => ControlKey::Meta,
-                    _ => ck,
+                        ControlKey::Meta => ControlKey::Control,
-                };
+                        ControlKey::RControl => ControlKey::Meta,
-                hbb_common::protobuf::EnumOrUnknown::new(ck)
+                        ControlKey::RWin => ControlKey::Control,
-            }).collect();
+                        _ => ck,
+                    };
+                    hbb_common::protobuf::EnumOrUnknown::new(ck)
+                })
+                .collect();
         };
     }
 }