support .net 4.7.2

.gitignore

@@ -7,3 +7,6 @@ DeftSharp.Windows.Input.sln.DotSettings.user
 WPF.Playground/bin
 WPF.Playground/obj
 .vs
+/Test_polyfill/bin
+/Test_polyfill/obj
+DeftSharp.Windows.Input/DeftSharp.Windows.Input.csproj.user

DeftSharp.Windows.Input.Tests/DeftSharp.Windows.Input.Tests.csproj

@@ -1,9 +1,11 @@
-<Project Sdk="Microsoft.NET.Sdk">
+<Project Sdk="Microsoft.NET.Sdk">
 
     <PropertyGroup>
-        <TargetFramework>net8.0-windows</TargetFramework>
+        <TargetFrameworks>net8.0-windows;net472</TargetFrameworks>
+        <LangVersion>latest</LangVersion>
+
         <ImplicitUsings>enable</ImplicitUsings>
-        <Nullable>enable</Nullable>
+        <Nullable>disable</Nullable>
 
         <IsPackable>false</IsPackable>
         <IsTestProject>true</IsTestProject>
@@ -32,4 +34,12 @@
       <ProjectReference Include="..\DeftSharp.Windows.Input\DeftSharp.Windows.Input.csproj" />
     </ItemGroup>
 
-</Project>
+    <ItemGroup>
+        <Reference Include="WindowsBase" Condition="'$(TargetFramework)' == 'net472'" />
+        <PackageReference Include="PolySharp" Version="1.15.0" Condition="'$(TargetFramework)' == 'net472'">
+            <PrivateAssets>all</PrivateAssets>
+            <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
+        </PackageReference>
+    </ItemGroup>
+
+</Project>

DeftSharp.Windows.Input.sln

@@ -1,10 +1,15 @@
 
 Microsoft Visual Studio Solution File, Format Version 12.00
-Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "DeftSharp.Windows.Input", "DeftSharp.Windows.Input\DeftSharp.Windows.Input.csproj", "{3D91851D-784F-4C38-B1F9-CD1D08AA364E}"
+# Visual Studio Version 17
+VisualStudioVersion = 17.11.35327.3
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "DeftSharp.Windows.Input", "DeftSharp.Windows.Input\DeftSharp.Windows.Input.csproj", "{3D91851D-784F-4C38-B1F9-CD1D08AA364E}"
 EndProject
-Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "WPF.Playground", "WPF.Playground\WPF.Playground.csproj", "{629A70FA-AB10-42AC-917A-0E86A3EA13D2}"
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "WPF.Playground", "WPF.Playground\WPF.Playground.csproj", "{629A70FA-AB10-42AC-917A-0E86A3EA13D2}"
 EndProject
-Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "DeftSharp.Windows.Input.Tests", "DeftSharp.Windows.Input.Tests\DeftSharp.Windows.Input.Tests.csproj", "{841090A8-C012-4E7F-86BB-053285D3CD7C}"
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "DeftSharp.Windows.Input.Tests", "DeftSharp.Windows.Input.Tests\DeftSharp.Windows.Input.Tests.csproj", "{CEDF1840-E75D-4E55-82D2-C9BBB0CC5C6C}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Test_polyfill", "Test_polyfill\Test_polyfill.csproj", "{E19A38F1-2B3E-4419-8E22-D7B0ADF60219}"
 EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
@@ -20,9 +25,19 @@ Global
 		{629A70FA-AB10-42AC-917A-0E86A3EA13D2}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{629A70FA-AB10-42AC-917A-0E86A3EA13D2}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{629A70FA-AB10-42AC-917A-0E86A3EA13D2}.Release|Any CPU.Build.0 = Release|Any CPU
-		{841090A8-C012-4E7F-86BB-053285D3CD7C}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
-		{841090A8-C012-4E7F-86BB-053285D3CD7C}.Debug|Any CPU.Build.0 = Debug|Any CPU
-		{841090A8-C012-4E7F-86BB-053285D3CD7C}.Release|Any CPU.ActiveCfg = Release|Any CPU
-		{841090A8-C012-4E7F-86BB-053285D3CD7C}.Release|Any CPU.Build.0 = Release|Any CPU
+		{CEDF1840-E75D-4E55-82D2-C9BBB0CC5C6C}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{CEDF1840-E75D-4E55-82D2-C9BBB0CC5C6C}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{CEDF1840-E75D-4E55-82D2-C9BBB0CC5C6C}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{CEDF1840-E75D-4E55-82D2-C9BBB0CC5C6C}.Release|Any CPU.Build.0 = Release|Any CPU
+		{E19A38F1-2B3E-4419-8E22-D7B0ADF60219}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{E19A38F1-2B3E-4419-8E22-D7B0ADF60219}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{E19A38F1-2B3E-4419-8E22-D7B0ADF60219}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{E19A38F1-2B3E-4419-8E22-D7B0ADF60219}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {7ECB5584-E473-4ECA-BBE6-F41F1DF9B6B7}
 	EndGlobalSection
 EndGlobal

DeftSharp.Windows.Input/DeftSharp.Windows.Input.csproj

@@ -1,7 +1,8 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
     <PropertyGroup>
-        <TargetFramework>net8.0-windows</TargetFramework>
+        <TargetFrameworks>net8.0-windows;net472</TargetFrameworks>
+
         <Nullable>enable</Nullable>
         <UseWPF>true</UseWPF>
         <PackageId>DeftSharp.Windows.Input</PackageId>

DeftSharp.Windows.Input/Native/API/MouseAPI.cs

@@ -140,7 +140,7 @@ internal static void SetMouseSpeed(int speed)
             _ => speed
         };
 
-        SystemParametersInfo(setMouseSpeedInfo, 0, mouseSpeed, updateIniFile | sendChangeInfo);
+        SystemParametersInfo(setMouseSpeedInfo, 0, out mouseSpeed, updateIniFile | sendChangeInfo);
     }
 
     /// <summary>

DeftSharp.Windows.Input/Native/Interceptors/WindowsInterceptor.cs

@@ -26,7 +26,7 @@ internal abstract class WindowsInterceptor : IRequestedInterceptor
     /// <summary>
     /// Identifier for the installed WinAPI hook.
     /// </summary>
-    protected nint HookId = nint.Zero;
+    protected nint HookId = (nint)0;//nint.Zero;
 
     /// <summary>
     /// Initializes a new instance of the WindowsListener class.
@@ -61,7 +61,7 @@ public void Unhook()
             return;
 
         User32.UnhookWindowsHookEx(HookId);
-        HookId = nint.Zero;
+        HookId = (nint)0; //nint.Zero;
         _isHandled = false;
     }
 

DeftSharp.Windows.Input/net472_polyFill.cs

@@ -0,0 +1,93 @@
+using System;
+using System.Collections.Concurrent;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Runtime.InteropServices;
+using System.Diagnostics;
+using System.Collections;
+using System.Runtime.CompilerServices;
+
+//namespace DeftSharp.Windows.Input{ }
+
+/// <summary>
+///  net472_polyFill
+/// </summary>
+public static partial class PolyFillExtensions
+{
+
+    //conditinal compile to get best performance.. 
+#if NETFRAMEWORK
+
+    /// <summary>
+    /// net472_polyFill
+    /// </summary>
+    public static IEnumerable<T> TakeLast<T>(this Queue<T> queue, int count) => TakeLast_internal(queue, count);
+
+    /// <summary>
+    ///  net472_polyFill
+    /// </summary>
+    public static TValue GetValueOrDefault<TKey, TValue>(this ConcurrentDictionary<TKey, TValue> dictionary, TKey key, TValue defaultValue) 
+        => dictionary.TryGetValue(key, out var value) ? value : defaultValue;
+
+    /// <summary>
+    ///  net472_polyFill 
+    /// </summary>
+    public static bool TryRemove<TK, TValue>(this ConcurrentDictionary<TK, TValue> dictionary, KeyValuePair<TK, TValue> item) 
+        => dictionary.TryRemove(item.Key, out _);
+
+#endif
+
+    /// <summary>
+    /// net472_polyFill - nint.Zero
+    /// </summary>
+    public static nint nint_Zero => (nint)0;
+
+
+}
+
+
+
+/// <summary>
+///  net472_polyFill - not for public use,  intented to be consumed in "Unit Tests".
+/// </summary>
+public static partial class PolyFillExtensions
+{
+
+
+    /// <summary>
+    /// net472_polyFill - internal  ---  Ex: collection.TakeLast(5);
+    /// </summary>
+    internal static IEnumerable<T> TakeLast_internal_viaSO<T>(this IEnumerable<T> source, int N)
+    {
+        return source.Skip(Math.Max(0, source.Count() - N));
+    }
+
+    /// <summary>
+    /// net472_polyFill - internal
+    /// </summary>
+    internal static IEnumerable<T> TakeLast_internal<T>(Queue<T> queue, int count)
+    {
+        if (queue is null)
+            throw new ArgumentNullException("source is null ");
+
+        if (count <= 0 || queue.Count == 0)
+            return [];
+
+        if (count <= 0)
+            return Enumerable.Empty<T>();
+        if (count >= queue.Count)
+            return queue.ToList();
+
+        //  isStartIndexFromEnd: true, startIndex: count,
+        //  isEndIndexFromEnd: true, endIndex: 0);
+        //return queue.Take(queue.Count - count).ToList();
+
+        var startIndex = queue.Count - count;
+        var take = count;
+
+        return queue.Skip(startIndex).Take(take).ToList();
+
+    }
+}

Test_polyfill/PolyFillTest.cs

@@ -0,0 +1,51 @@
+using System.Linq.Expressions;
+using System.Linq;
+using Xunit;
+
+namespace DeftSharp.Windows.Input;
+
+public sealed class PolyFillTest
+{
+
+    [Fact]
+    public async void TakeLast_1()
+    {
+        int TakeLast_count = 1;
+        var que = new Queue<int>(new[] { 1, 2, 3, 4, 5 });
+
+        var val = Enumerable.TakeLast(que, TakeLast_count).ToList();  // net8 original Linq
+        var valpf = PolyFillExtensions.TakeLast(que, TakeLast_count).ToList();
+
+        Assert.True(val[0] == valpf[0]);
+        //await Task.Run(() => { });
+    }
+
+    [Fact]
+    public async void TakeLast_2()
+    {
+        int TakeLast_count = 2;
+        var que = new Queue<int>(new[] { 1, 2, 3, 4, 5 });
+
+        var val = Enumerable.TakeLast(que, TakeLast_count).ToList();  // net8 original Linq
+        var valpf = PolyFillExtensions.TakeLast(que, TakeLast_count).ToList();
+
+        Assert.True(val[0] == valpf[0]);
+        Assert.True(val[1] == valpf[1]);
+    }
+
+    [Fact]
+    public async void TakeLast_3()
+    {
+        int TakeLast_count = 10;
+        var que = new Queue<int>(Enumerable.Range(1,100));
+
+        var val = Enumerable.TakeLast(que, TakeLast_count).ToList();  // net8 original Linq
+        var valpf = PolyFillExtensions.TakeLast(que, TakeLast_count).ToList();
+
+        Assert.True(val[0] == valpf[0]);
+        Assert.True(val[4] == valpf[4]);
+        Assert.True(val[9] == valpf[9]);
+    }
+
+
+}

Test_polyfill/Test_polyfill.csproj

@@ -0,0 +1,31 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net8.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+
+    <IsPackable>false</IsPackable>
+    <IsTestProject>true</IsTestProject>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <Compile Remove="UnitTest1.cs" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <PackageReference Include="coverlet.collector" Version="6.0.0" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.8.0" />
+    <PackageReference Include="xunit" Version="2.5.3" />
+    <PackageReference Include="xunit.runner.visualstudio" Version="2.5.3" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\DeftSharp.Windows.Input\DeftSharp.Windows.Input.csproj" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <Using Include="Xunit" />
+  </ItemGroup>
+
+</Project>