Allow file drag-and-drop

src/SizeBench.GUI/Windows/SelectSingleBinaryAndPDBControl.xaml

@@ -1,11 +1,13 @@
 <UserControl x:Class="SizeBench.GUI.Windows.SelectSingleBinaryAndPDBControl"
              xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
              xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
-             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
-             xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
-             mc:Ignorable="d" 
+             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+             xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+             mc:Ignorable="d"
              d:DesignWidth="500">
-    <Grid>
+    <Grid AllowDrop="True "
+          PreviewDragOver="OnDragOver"
+          PreviewDrop="OnDrop">
         <Grid.ColumnDefinitions>
             <ColumnDefinition/>
             <ColumnDefinition/>

src/SizeBench.GUI/Windows/SelectSingleBinaryAndPDBControl.xaml.cs

@@ -1,4 +1,5 @@
 using System.Diagnostics.CodeAnalysis;
+using System.IO;
 using System.Windows;
 using System.Windows.Controls;
 using Microsoft.Win32;
@@ -56,4 +57,93 @@ private void btnBinaryPathBrowse_Click(object sender, RoutedEventArgs e)
             this._viewModel!.BinaryPath = ofd.FileName;
         }
     }
+
+    private void OnDragOver(object sender, DragEventArgs e)
+    {
+        e.Effects = GetDroppedExeAndPdb(e.Data) is null ? DragDropEffects.None : DragDropEffects.Copy;
+        e.Handled = true;
+    }
+
+    private static (string, string)? GetDroppedExeAndPdb(IDataObject data)
+    {
+        if (!data.GetDataPresent(DataFormats.FileDrop))
+        {
+            return null;
+        }
+
+        var files = (data.GetData(DataFormats.FileDrop) as string[])!;
+
+        if (files.Length is < 0 or > 2)
+        {
+            return null;
+        }
+
+        string? exePath = null;
+        string? pdbPath = null;
+        foreach (var file in files)
+        {
+            if (file.EndsWith(".exe", StringComparison.OrdinalIgnoreCase))
+            {
+                exePath = file;
+            }
+            else if (file.EndsWith(".pdb", StringComparison.OrdinalIgnoreCase))
+            {
+                pdbPath = file;
+            }
+        }
+
+        if (exePath is null && pdbPath is null)
+        {
+            return null;
+        }
+
+        if (exePath is not null && pdbPath is not null)
+        {
+            return (exePath, pdbPath);
+        }
+
+        if (files.Length != 1)
+        {
+            return null;
+        }
+
+        if (exePath is not null)
+        {
+            pdbPath = exePath[..^3] + "pdb";
+            if (File.Exists(pdbPath))
+            {
+                return (exePath, pdbPath);
+            }
+
+            return null;
+        }
+
+        if (pdbPath is not null)
+        {
+            exePath = pdbPath[..^3] + "exe";
+            if (File.Exists(exePath))
+            {
+                return (exePath, pdbPath);
+            }
+        }
+
+        return null;
+    }
+
+    private void OnDrop(object sender, DragEventArgs e)
+    {
+        var exeAndPdb = GetDroppedExeAndPdb(e.Data);
+        if (exeAndPdb is null)
+        {
+            e.Effects = DragDropEffects.None;
+            e.Handled = true;
+            return;
+        }
+
+        var (exePath, pdbPath) = exeAndPdb.Value;
+        this._viewModel!.PDBPath = pdbPath;
+        this._viewModel!.BinaryPath = exePath;
+        e.Effects = DragDropEffects.Copy;
+        e.Handled = true;
+    }
 }