notify property changed with magic

.gitignore

@@ -1,3 +1,4 @@
 .vs/
 bin/
 obj/
+packages/

chuni-hands/Config.cs

@@ -1,5 +1,9 @@
 namespace chuni_hands {
-    public sealed class Config {
+    public sealed class Config : Helpers.PropertyChangedInvoker {
+        static Config() {
+            Helpers.PatchNotifyPropertyChanged<Config>();
+        }
+
         public int OffsetX { get; set; }
         public int OffsetY { get; set; }
         public int Exposure { get; set; } = -6;

chuni-hands/Helpers.cs

@@ -1,6 +1,11 @@
-using System.Diagnostics;
+using System;
+using System.ComponentModel;
+using System.Diagnostics;
 using System.IO;
+using System.Linq;
 using System.Reflection;
+using System.Windows.Threading;
+using Harmony;
 using Newtonsoft.Json;
 
 namespace chuni_hands {
@@ -18,5 +23,34 @@ namespace chuni_hands {
         public static string GetVersion() {
             return FileVersionInfo.GetVersionInfo(Assembly.GetExecutingAssembly().Location).ProductVersion;
         }
+
+        private static HarmonyInstance _harmony = HarmonyInstance.Create("co.logu.chuni-hands.helpers");
+
+        public static void PatchNotifyPropertyChanged<T>() where T : PropertyChangedInvoker {
+            var type = typeof(T);
+            var patch = typeof(Helpers).GetMethod("PropertyChangedPostfix", BindingFlags.NonPublic | BindingFlags.Static);
+            Debug.Assert(patch != null, nameof(patch) + " != null");
+            patch = patch.MakeGenericMethod(type);
+
+            foreach (var method in type.GetProperties().Select(p => p.SetMethod)) {
+                _harmony.Patch(method, new HarmonyMethod(patch));
+            }
+        }
+
+        // ReSharper disable InconsistentNaming
+        // ReSharper disable once UnusedMember.Local
+        private static void PropertyChangedPostfix<T>(MethodBase __originalMethod, T __instance) where T : PropertyChangedInvoker {
+            __instance.InvokePropertyChanged(__originalMethod.Name.Substring(4)); // remove set_
+        }
+        // ReSharper restore InconsistentNaming
+
+        public abstract class PropertyChangedInvoker : INotifyPropertyChanged {
+            public event PropertyChangedEventHandler PropertyChanged;
+            public virtual void InvokePropertyChanged(string propertyName) {
+                Dispatcher.CurrentDispatcher.BeginInvoke(new Action(() => {
+                    PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
+                }));
+            }
+        }
     }
 }

chuni-hands/MainWindow.xaml

@@ -16,7 +16,7 @@
         <Grid Grid.Column="0" Margin="12">
             <local:ChuniCanvas x:Name="TheCanvas"></local:ChuniCanvas>
         </Grid>
-        <DockPanel Grid.Column="1" LastChildFill="True">
+        <DockPanel Grid.Column="1" LastChildFill="True" DataContext="{Binding ElementName=TheWindow, Path=Config}">
             <StackPanel DockPanel.Dock="Top" Margin="12">
                 <Button x:Name="ResetButton" Click="ResetButton_Click">Reset</Button>
                 <DockPanel LastChildFill="True">
@@ -26,17 +26,18 @@
                 </DockPanel>
                 <DockPanel LastChildFill="True">
                     <TextBlock DockPanel.Dock="Left">Distance </TextBlock>
-                    <Slider DockPanel.Dock="Right" Value="{Binding ElementName=TheWindow, Path=Config.Distance, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" Minimum="20" Maximum="100"></Slider>
+                    <Slider DockPanel.Dock="Right" Value="{Binding Path=Distance, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" Minimum="20" Maximum="100"></Slider>
                 </DockPanel>
                 <DockPanel LastChildFill="True">
                     <TextBlock DockPanel.Dock="Left">X</TextBlock>
-                    <Slider DockPanel.Dock="Right" Value="{Binding ElementName=TheWindow, Path=Config.OffsetX, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" Minimum="-320" Maximum="320"></Slider>
+                    <Slider DockPanel.Dock="Right" Value="{Binding Path=OffsetX, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" Minimum="-320" Maximum="320"></Slider>
                 </DockPanel>
                 <DockPanel LastChildFill="True">
                     <TextBlock DockPanel.Dock="Left">Y</TextBlock>
-                    <Slider DockPanel.Dock="Right" Value="{Binding ElementName=TheWindow, Path=Config.OffsetY, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" Minimum="-240" Maximum="240"></Slider>
+                    <Slider DockPanel.Dock="Right" Value="{Binding Path=OffsetY, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" Minimum="-240" Maximum="240"></Slider>
                 </DockPanel>
-                <CheckBox IsChecked="{Binding ElementName=TheWindow, Path=Config.LogDiff, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}">Log diff</CheckBox>
+                <Button x:Name="CenterButton" Click="CenterButton_Click">Center</Button>
+                <CheckBox IsChecked="{Binding Path=LogDiff, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}">Log diff</CheckBox>
             </StackPanel>
             
             <RichTextBox DockPanel.Dock="Bottom" x:Name="LogBox">

chuni-hands/MainWindow.xaml.cs

@@ -150,5 +150,10 @@ namespace chuni_hands {
                 _config.Threshold = v;
             }
         }
+
+        private void CenterButton_Click(object sender, RoutedEventArgs e) {
+            _config.OffsetX = 0;
+            _config.OffsetY = 0;
+        }
     }
 }

chuni-hands/chuni-hands.csproj

@@ -57,6 +57,9 @@
     <Prefer32Bit>true</Prefer32Bit>
   </PropertyGroup>
   <ItemGroup>
+    <Reference Include="0Harmony, Version=1.2.0.1, Culture=neutral, processorArchitecture=MSIL">
+      <HintPath>..\packages\Lib.Harmony.1.2.0.1\lib\net472\0Harmony.dll</HintPath>
+    </Reference>
     <Reference Include="Emgu.CV.World.Netstandard">
       <HintPath>C:\Emgu\emgucv-windesktop 4.2.0.3662\bin\Emgu.CV.World.Netstandard.dll</HintPath>
     </Reference>

chuni-hands/packages.config

@@ -1,4 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
 <packages>
+  <package id="Lib.Harmony" version="1.2.0.1" targetFramework="net472" />
   <package id="Newtonsoft.Json" version="12.0.3" targetFramework="net472" />
 </packages>