always block desktop settings page if video connection exists (#10224)

1. Always block desktop settings page if video connection exists, both mouse event and key event are blocked..
2. Server control page always block key event.

Signed-off-by: 21pages <sunboeasy@gmail.com>

flutter/lib/desktop/pages/desktop_home_page.dart

@@ -35,7 +35,7 @@ class DesktopHomePage extends StatefulWidget {
 const borderColor = Color(0xFF2F65BA);
 
 class _DesktopHomePageState extends State<DesktopHomePage>
-    with AutomaticKeepAliveClientMixin {
+    with AutomaticKeepAliveClientMixin, WidgetsBindingObserver {
   final _leftPaneScrollController = ScrollController();
 
   @override
@@ -51,6 +51,7 @@ class _DesktopHomePageState extends State<DesktopHomePage>
   bool isCardClosed = false;
 
   final RxBool _editHover = false.obs;
+  final RxBool _block = false.obs;
 
   final GlobalKey _childKey = GlobalKey();
 
@@ -58,14 +59,20 @@ class _DesktopHomePageState extends State<DesktopHomePage>
   Widget build(BuildContext context) {
     super.build(context);
     final isIncomingOnly = bind.isIncomingOnly();
-    return Row(
+    return _buildBlock(
+        child: Row(
       crossAxisAlignment: CrossAxisAlignment.start,
       children: [
         buildLeftPane(context),
         if (!isIncomingOnly) const VerticalDivider(width: 1),
         if (!isIncomingOnly) Expanded(child: buildRightPane(context)),
       ],
-    );
+    ));
+  }
+
+  Widget _buildBlock({required Widget child}) {
+    return buildRemoteBlock(
+        block: _block, mask: true, use: canBeBlocked, child: child);
   }
 
   Widget buildLeftPane(BuildContext context) {
@@ -805,6 +812,7 @@ class _DesktopHomePageState extends State<DesktopHomePage>
         _updateWindowSize();
       });
     }
+    WidgetsBinding.instance.addObserver(this);
   }
 
   _updateWindowSize() {
@@ -830,9 +838,18 @@ class _DesktopHomePageState extends State<DesktopHomePage>
       platformFFI.unregisterEventHandler(
           kCheckSoftwareUpdateFinish, kCheckSoftwareUpdateFinish);
     }
+    WidgetsBinding.instance.removeObserver(this);
     super.dispose();
   }
 
+  @override
+  void didChangeAppLifecycleState(AppLifecycleState state) {
+    super.didChangeAppLifecycleState(state);
+    if (state == AppLifecycleState.resumed) {
+      shouldBeBlocked(_block, canBeBlocked);
+    }
+  }
+
   Widget buildPluginEntry() {
     final entries = PluginUiManager.instance.entries.entries;
     return Offstage(