feat: 查看公告按钮添加检查时禁用

src/MaaWpfGui/ViewModels/UI/SettingsViewModel.cs

@@ -678,12 +678,38 @@ namespace MaaWpfGui.ViewModels.UI
             (sender as ComboBox)?.MakeComboBoxSearchable();
         }
 
+        private bool _isCheckingAnnouncement = false;
+
+        public bool IsCheckingAnnouncement
+        {
+            get => _isCheckingAnnouncement;
+            set
+            {
+                SetAndNotify(ref _isCheckingAnnouncement, value);
+            }
+        }
+
         // UI 绑定的方法
         [UsedImplicitly]
         public async Task CheckAndDownloadAnnouncement()
         {
-            await Instances.AnnouncementViewModel.CheckAndDownloadAnnouncement();
-            _ = Execute.OnUIThreadAsync(() => Instances.WindowManager.ShowWindow(Instances.AnnouncementViewModel));
+            if (IsCheckingAnnouncement)
+            {
+                return;
+            }
+
+            IsCheckingAnnouncement = true;
+
+            try
+            {
+                await Instances.AnnouncementViewModel.CheckAndDownloadAnnouncement();
+                await Execute.OnUIThreadAsync(() =>
+                    Instances.WindowManager.ShowWindow(Instances.AnnouncementViewModel));
+            }
+            finally
+            {
+                IsCheckingAnnouncement = false;
+            }
         }
 
         /// <summary>

src/MaaWpfGui/Views/UserControl/Settings/AboutUserControl.xaml

@@ -2,6 +2,7 @@
     x:Class="MaaWpfGui.Views.UserControl.Settings.AboutUserControl"
     xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+    xmlns:c="clr-namespace:CalcBinding;assembly=CalcBinding"
     xmlns:constants="clr-namespace:MaaWpfGui.Constants"
     xmlns:controls="clr-namespace:MaaWpfGui.Styles.Controls"
     xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
@@ -59,7 +60,8 @@
                 Width="Auto"
                 Margin="5"
                 Command="{s:Action CheckAndDownloadAnnouncement}"
-                Content="{DynamicResource CheckAndDownloadAnnouncement}" />
+                Content="{DynamicResource CheckAndDownloadAnnouncement}"
+                IsEnabled="{c:Binding !IsCheckingAnnouncement}" />
         </StackPanel>
         <StackPanel Grid.Column="1">
             <controls:TextBlock