feat: tooltip for backend availability

Author: Xiphereal

Desktop/BackendAvailability/Converters/BoolToAvailabilityTextConverter.cs

@@ -0,0 +1,27 @@
+using System.Globalization;
+using System.Windows.Data;
+
+namespace Desktop.BackendAvailability.Converters;
+
+public class BoolToAvailabilityTextConverter : IValueConverter
+{
+    public object? Convert(
+        object? value,
+        Type targetType,
+        object? parameter,
+        CultureInfo culture)
+    {
+        return (bool)value
+            ? "The cloud storage is available"
+            : "The cloud storage is currently unavailable";
+    }
+
+    public object? ConvertBack(
+        object? value,
+        Type targetType,
+        object? parameter,
+        CultureInfo culture)
+    {
+        throw new NotSupportedException();
+    }
+}

Desktop/MainWindow.xaml

@@ -17,6 +17,8 @@
                 <BitmapImage UriSource="pack://application:,,,/BackendAvailability/Resources/BackendUnavailable.png" />
             </backendAvailabilityConverters:BoolToImageConverter.BackendUnavailable>
         </backendAvailabilityConverters:BoolToImageConverter>
+
+        <backendAvailabilityConverters:BoolToAvailabilityTextConverter x:Key="BoolToAvailabilityTextConverter" />
     </Window.Resources>
     <Grid>
         <Grid.ColumnDefinitions>
@@ -40,6 +42,7 @@
         <Image Grid.Column="2"
                Width="32"
                Height="32"
+               ToolTip="{Binding IsBackendAvailable, Converter={StaticResource BoolToAvailabilityTextConverter}}"
                Source="{Binding IsBackendAvailable, Converter={StaticResource BoolToImageConverter}}" />
     </Grid>
 </Window>