Add progress ring

Author: Jack251970

Flow.Launcher/ReleaseNotesWindow.xaml

@@ -163,6 +163,29 @@
                     VerticalAlignment="Stretch"
                     ClickAction="SafetyDisplayWithRelativePath"
                     Loaded="MarkdownViewer_Loaded" />
+
+                <!--  Put this Grid in the same position as MarkdownViewer  -->
+                <Grid
+                    Grid.Row="1"
+                    Grid.Column="0"
+                    Grid.ColumnSpan="5"
+                    Height="510"
+                    Margin="15 0 20 0">
+                    <ui:ProgressRing
+                        x:Name="RefreshProgressRing"
+                        Width="30"
+                        Height="30"
+                        HorizontalAlignment="Center"
+                        VerticalAlignment="Center"
+                        IsActive="True" />
+                    <Button
+                        x:Name="RefreshButton"
+                        HorizontalAlignment="Center"
+                        VerticalAlignment="Center"
+                        Click="RefreshButton_Click"
+                        Content="{DynamicResource refresh}"
+                        Visibility="Collapsed" />
+                </Grid>
             </Grid>
         </Border>
     </Grid>

Flow.Launcher/ReleaseNotesWindow.xaml.cs

@@ -81,7 +81,7 @@ private void Window_StateChanged(object sender, EventArgs e)
         private static async Task<string> GetReleaseNotesMarkdownAsync()
         {
             var releaseNotesJSON = await Http.GetStringAsync("https://api.github.com/repos/Flow-Launcher/Flow.Launcher/releases");
-            
+
             if (string.IsNullOrEmpty(releaseNotesJSON))
             {
                 return string.Empty;
@@ -150,11 +150,37 @@ private sealed class GitHubReleaseInfo
 
         #endregion
 
-        [System.Diagnostics.CodeAnalysis.SuppressMessage("Usage", "VSTHRD100:Avoid async void methods", Justification = "<Pending>")]
-        private async void MarkdownViewer_Loaded(object sender, RoutedEventArgs e)
+        private void MarkdownViewer_Loaded(object sender, RoutedEventArgs e)
         {
             MarkdownViewer.MarkdownStyle = MarkdownStyle.GithubLike;
-            MarkdownViewer.Markdown = await GetReleaseNotesMarkdownAsync();
+            RefreshMarkdownViewer();
+        }
+
+        private void RefreshButton_Click(object sender, RoutedEventArgs e)
+        {
+            RefreshButton.Visibility = Visibility.Collapsed;
+            RefreshProgressRing.Visibility = Visibility.Visible;
+            RefreshMarkdownViewer();
+        }
+
+        [System.Diagnostics.CodeAnalysis.SuppressMessage("Usage", "VSTHRD100:Avoid async void methods", Justification = "<Pending>")]
+        private async void RefreshMarkdownViewer()
+        {
+            var output = await GetReleaseNotesMarkdownAsync().ConfigureAwait(false);
+
+            Application.Current.Dispatcher.Invoke(() =>
+            {
+                RefreshProgressRing.Visibility = Visibility.Collapsed;
+                if (string.IsNullOrEmpty(output))
+                {
+                    RefreshButton.Visibility = Visibility.Visible;
+                }
+                else
+                {
+                    RefreshButton.Visibility = Visibility.Collapsed;
+                    MarkdownViewer.Markdown = output;
+                }
+            });
         }
     }
 }