feat, win virtual display

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

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;