feat, win virtual display

Signed-off-by: fufesou <shuanglongchen@yeah.net>

flutter/lib/common/widgets/autocomplete.dart

@@ -32,7 +32,7 @@ import 'package:flutter_hbb/common/widgets/peer_card.dart';
           for (var peer in peerData) {
             if (peer is Map && peer.containsKey("id")) {
               String id = peer["id"];
-              if (id != null && !combinedPeers.containsKey(id)) {
+              if (!combinedPeers.containsKey(id)) {
                 combinedPeers[id] = peer;
               }
             }

flutter/lib/consts.dart

@@ -5,6 +5,9 @@ import 'package:flutter_hbb/common.dart';
 import 'package:flutter_hbb/models/state_model.dart';
 import 'package:get/get.dart';
 
+const int kMaxVirtualDisplayCount = 4;
+const int kAllVirtualDisplay = -1;
+
 const double kDesktopRemoteTabBarHeight = 28.0;
 const int kInvalidWindowId = -1;
 const int kMainWindowId = 0;
@@ -15,6 +18,11 @@ const kKeyLegacyMode = 'legacy';
 const kKeyMapMode = 'map';
 const kKeyTranslateMode = 'translate';
 
+const String kPlatformAdditionsIsWayland = "is_wayland";
+const String kPlatformAdditionsHeadless = "headless";
+const String kPlatformAdditionsIsInstalled = "is_installed";
+const String kPlatformAdditionsVirtualDisplays = "virtual_displays";
+
 const String kPeerPlatformWindows = "Windows";
 const String kPeerPlatformLinux = "Linux";
 const String kPeerPlatformMacOS = "Mac OS";

flutter/lib/desktop/widgets/remote_toolbar.dart

@@ -978,6 +978,10 @@ class _DisplayMenuState extends State<_DisplayMenu> {
             ffi: widget.ffi,
             screenAdjustor: _screenAdjustor,
           ),
+          _VirtualDisplayMenu(
+            id: widget.id,
+            ffi: widget.ffi,
+          ),
           Divider(),
           toggles(),
           widget.pluginItem,
@@ -1387,6 +1391,70 @@ class _ResolutionsMenuState extends State<_ResolutionsMenu> {
   }
 }
 
+class _VirtualDisplayMenu extends StatefulWidget {
+  final String id;
+  final FFI ffi;
+
+  _VirtualDisplayMenu({
+    Key? key,
+    required this.id,
+    required this.ffi,
+  }) : super(key: key);
+
+  @override
+  State<_VirtualDisplayMenu> createState() => _VirtualDisplayMenuState();
+}
+
+class _VirtualDisplayMenuState extends State<_VirtualDisplayMenu> {
+  @override
+  void initState() {
+    super.initState();
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    if (widget.ffi.ffiModel.pi.platform != kPeerPlatformWindows) {
+      return Offstage();
+    }
+    if (!widget.ffi.ffiModel.pi.isInstalled) {
+      return Offstage();
+    }
+
+    final virtualDisplays = widget.ffi.ffiModel.pi.virtualDisplays;
+
+    final children = <Widget>[];
+    for (var i = 0; i < kMaxVirtualDisplayCount; i++) {
+      children.add(CkbMenuButton(
+        value: virtualDisplays.contains(i + 1),
+        onChanged: (bool? value) async {
+          if (value != null) {
+            bind.sessionToggleVirtualDisplay(
+                sessionId: widget.ffi.sessionId, index: i + 1, on: value);
+          }
+        },
+        child: Text('${translate('Virtual display')} ${i + 1}'),
+        ffi: widget.ffi,
+      ));
+    }
+    children.add(Divider());
+    children.add(MenuButton(
+      onPressed: () {
+        bind.sessionToggleVirtualDisplay(
+            sessionId: widget.ffi.sessionId,
+            index: kAllVirtualDisplay,
+            on: false);
+      },
+      ffi: widget.ffi,
+      child: Text(translate('Plug out all')),
+    ));
+    return _SubmenuButton(
+      ffi: widget.ffi,
+      menuChildren: children,
+      child: Text(translate("Virtual display")),
+    );
+  }
+}
+
 class _KeyboardMenu extends StatelessWidget {
   final String id;
   final FFI ffi;

flutter/lib/models/model.dart

@@ -248,6 +248,8 @@ class FfiModel with ChangeNotifier {
         handlePeerInfo(evt, peerId, false);
       } else if (name == 'sync_peer_info') {
         handleSyncPeerInfo(evt, sessionId, peerId);
+      } else if (name == 'sync_platform_additions') {
+        handlePlatformAdditions(evt, sessionId, peerId);
       } else if (name == 'connection_ready') {
         setConnectionType(
             peerId, evt['secure'] == 'true', evt['direct'] == 'true');
@@ -895,6 +897,33 @@ class FfiModel with ChangeNotifier {
     notifyListeners();
   }
 
+  handlePlatformAdditions(
+      Map<String, dynamic> evt, SessionID sessionId, String peerId) async {
+    final updateData = evt['platform_additions'] as String?;
+    if (updateData == null) {
+      return;
+    }
+
+    if (updateData.isEmpty) {
+      _pi.platformAdditions.remove(kPlatformAdditionsVirtualDisplays);
+    } else {
+      try {
+        final updateJson = json.decode(updateData);
+        for (final key in updateJson.keys) {
+          _pi.platformAdditions[key] = updateJson[key];
+        }
+        if (!updateJson.contains(kPlatformAdditionsVirtualDisplays)) {
+          _pi.platformAdditions.remove(kPlatformAdditionsVirtualDisplays);
+        }
+      } catch (e) {
+        debugPrint('Failed to decode platformAdditions $e');
+      }
+    }
+
+    cachedPeerData.peerInfo['platform_additions'] =
+        json.encode(_pi.platformAdditions);
+  }
+
   // Directly switch to the new display without waiting for the response.
   switchToNewDisplay(int display, SessionID sessionId, String peerId) {
     // VideoHandler creation is upon when video frames are received, so either caching commands(don't know next width/height) or stopping recording when switching displays.
@@ -2300,8 +2329,13 @@ class PeerInfo with ChangeNotifier {
   RxInt displaysCount = 0.obs;
   RxBool isSet = false.obs;
 
-  bool get isWayland => platformAdditions['is_wayland'] == true;
-  bool get isHeadless => platformAdditions['headless'] == true;
+  bool get isWayland => platformAdditions[kPlatformAdditionsIsWayland] == true;
+  bool get isHeadless => platformAdditions[kPlatformAdditionsHeadless] == true;
+  bool get isInstalled =>
+      platform != kPeerPlatformWindows ||
+      platformAdditions[kPlatformAdditionsIsInstalled] == true;
+  List<int> get virtualDisplays => List<int>.from(
+      platformAdditions[kPlatformAdditionsVirtualDisplays] ?? []);
 
   bool get isSupportMultiDisplay => isDesktop && isSupportMultiUiSession;