From 483657911d5f3ad96716e19d323529a5527dc2a1 Mon Sep 17 00:00:00 2001
From: Lorenz Stechauner <lorenz.stechauner@necronda.net>
Date: Thu, 9 Mar 2023 23:02:54 +0100
Subject: [PATCH] Add Utils.RunBackground

---
 WGneu/App.xaml.cs                |  6 +++---
 WGneu/Documents/Pdf.cs           |  2 +-
 WGneu/Utils.cs                   | 10 ++++++++++
 WGneu/Windows/MainWindow.xaml.cs | 12 ++++--------
 4 files changed, 18 insertions(+), 12 deletions(-)

diff --git a/WGneu/App.xaml.cs b/WGneu/App.xaml.cs
index 14f9039..72520b5 100644
--- a/WGneu/App.xaml.cs
+++ b/WGneu/App.xaml.cs
@@ -19,13 +19,13 @@ namespace WGneu {
         }
 
         protected override void OnStartup(StartupEventArgs e) {
-            Task.Run(() => Documents.Html.Init(PrintingReadyChanged));
-            Task.Run(() => Documents.Pdf.Init(PrintingReadyChanged));
+            Utils.RunBackground("HTML Initialization", () => Documents.Html.Init(PrintingReadyChanged));
+            Utils.RunBackground("PDF Initialization", () => Documents.Pdf.Init(PrintingReadyChanged));
             base.OnStartup(e);
         }
 
         protected override void OnExit(ExitEventArgs e) {
-            Task.Run(() => Documents.Pdf.Close());
+            Utils.RunBackground("PDF Close", () => Documents.Pdf.Close());
             base.OnExit(e);
         }
 
diff --git a/WGneu/Documents/Pdf.cs b/WGneu/Documents/Pdf.cs
index 652861f..30bb3fb 100644
--- a/WGneu/Documents/Pdf.cs
+++ b/WGneu/Documents/Pdf.cs
@@ -39,7 +39,7 @@ namespace WGneu.Documents {
             if (Browser == null) throw new InvalidOperationException("The puppeteer engine has not been initialized yet");
             using var page = await Browser.NewPageAsync();
             page.Console += OnConsole;
-            await page.GoToAsync("file://" + htmlPath);
+            await page.GoToAsync($"file://{htmlPath}");
             await page.EvaluateFunctionAsync("async () => { await window.PagedPolyfill.preview(); }");
             await page.PdfAsync(pdfPath, new() {
                 PreferCSSPageSize = true,
diff --git a/WGneu/Utils.cs b/WGneu/Utils.cs
index 946740e..b214b23 100644
--- a/WGneu/Utils.cs
+++ b/WGneu/Utils.cs
@@ -46,6 +46,16 @@ namespace WGneu {
             return a.Select(ch => ch - '0').Aggregate((sum, n) => (sum * 10 + n) % b);
         }
 
+        public static void RunBackground(string title, Func<Task> a) {
+            Task.Run(async () => {
+                try {
+                    await a();
+                } catch (Exception e) {
+                    MessageBox.Show(e.ToString(), title, MessageBoxButton.OK, MessageBoxImage.Error);
+                }
+            });
+        }
+
         public sealed class TemporaryFile : IDisposable {
             private int Usages = 0;
             public string FilePath { get; private set; }
diff --git a/WGneu/Windows/MainWindow.xaml.cs b/WGneu/Windows/MainWindow.xaml.cs
index 489f96a..465fbfd 100644
--- a/WGneu/Windows/MainWindow.xaml.cs
+++ b/WGneu/Windows/MainWindow.xaml.cs
@@ -43,14 +43,10 @@ namespace WGneu.Windows {
         }
 
         private void Button4_Click(object sender, EventArgs e) {
-            Task.Run(async () => {
-                try {
-                    using var letter = new BusinessLetter("Test Dokument", _context.Members.First());
-                    await letter.Generate();
-                    letter.Show();
-                } catch (Exception e) {
-                    MessageBox.Show(e.ToString(), "PDF Generation", MessageBoxButton.OK, MessageBoxImage.Error);
-                }
+            Utils.RunBackground("PDF Generation", async () => {
+                using var letter = new BusinessLetter("Test Dokument", _context.Members.First());
+                await letter.Generate();
+                letter.Show();
             });
         }
     }