WIP

2024-11-02 19:56:57 +00:00
parent 862e7b2e34
commit ebc4ce5433
16 changed files with 442 additions and 4 deletions
@@ -0,0 +1,189 @@
+using Windows.Win32;
+using Windows.Win32.UI.WindowsAndMessaging;
+using Windows.Win32.Foundation;
+using System.Diagnostics.CodeAnalysis;
+using System.Drawing;
+
+namespace Toolkit.Windows;
+
+public record PointerPressed(PointerLocation Location, PointerButton Button = PointerButton.Left);
+
+public record PointerDragReleased(PointerLocation Location, PointerButton Button = PointerButton.Left);
+
+public record PointerReleased(PointerLocation Location, PointerButton Button = PointerButton.Left);
+
+public record PointerLocation(int X, int Y);
+
+public record PointerMoved(PointerLocation Location);
+
+internal enum WndProcMessages
+{
+    WM_LBUTTONUP = 0x0202,
+    WM_MBUTTONUP = 0x0208,
+    WM_RBUTTONUP = 0x0205,
+    WM_MOUSEMOVE = 0x0200,
+    WM_SETTINGCHANGE = 0x001A,
+    WM_MBUTTONDOWN = 0x0207,
+    WM_LBUTTONDOWN = 0x0201,
+    WM_RBUTTONDOWN = 0x0204
+}
+
+public enum PointerButton
+{
+    Left,
+    Middle,
+    Right
+}
+
+public record PointerDrag(PointerLocation Location);
+
+
+public class PointerMonitor : IPointerMonitor
+{
+    private readonly IMessenger messenger;
+    private bool isDisposed;
+    private bool isPointerPressed;
+    private HOOKPROC? mouseEventDelegate;
+    private UnhookWindowsHookExSafeHandle? mouseHandle;
+    private bool isPointerDrag;
+
+    public PointerMonitor(IMessenger messenger)
+    {
+        this.messenger = messenger;
+    }
+
+    ~PointerMonitor()
+    {
+        Dispose(false);
+    }
+
+    public void Dispose()
+    {
+        Dispose(true);
+        GC.SuppressFinalize(this);
+    }
+
+    public unsafe Task Initialize()
+    {
+        InitializeHook();
+        return Task.CompletedTask;
+    }
+
+    protected virtual void Dispose(bool disposing)
+    {
+        if (!isDisposed)
+        {
+            RemoveHook();
+            isDisposed = true;
+        }
+    }
+
+    private unsafe void InitializeHook()
+    {
+        mouseEventDelegate = new HOOKPROC(MouseProc);
+        mouseHandle = PInvoke.SetWindowsHookEx(WINDOWS_HOOK_ID.WH_MOUSE_LL, mouseEventDelegate,
+            PInvoke.GetModuleHandle("user32.dll"), 0);
+    }
+
+    private unsafe bool TryGetPointer(out Point point)
+    {
+        fixed (Point* lpPointLocal = &point)
+        {
+            return PInvoke.GetPhysicalCursorPos(lpPointLocal);
+        }
+    }
+
+    private bool TryGetPointerLocation([MaybeNullWhen(false)] out PointerLocation location)
+    {
+        if (TryGetPointer(out Point point))
+        {
+            location = new PointerLocation(point.X, point.Y);
+            return true;
+
+        }
+
+        location = null;
+        return false;
+    }
+
+    private LRESULT MouseProc(int nCode, WPARAM wParam, LPARAM lParam)
+    {
+        if (nCode >= 0)
+        {
+
+            if (TryGetPointerLocation(out var location))
+            {
+                switch ((uint)wParam.Value)
+                {
+                    case (uint)WndProcMessages.WM_MOUSEMOVE:
+                        SendPointerMoved(location);
+                        break;
+                    case (uint)WndProcMessages.WM_LBUTTONUP:
+                        SendPointerReleased(location, PointerButton.Left);
+                        break;
+                    case (uint)WndProcMessages.WM_MBUTTONUP:
+                        SendPointerReleased(location, PointerButton.Middle);
+                        break;
+                    case (uint)WndProcMessages.WM_RBUTTONUP:
+                        SendPointerReleased(location, PointerButton.Right);
+                        break;
+                    case (uint)WndProcMessages.WM_LBUTTONDOWN:
+                        SendPointerPressed(location, PointerButton.Left);
+                        break;
+                    case (uint)WndProcMessages.WM_MBUTTONDOWN:
+                        SendPointerPressed(location, PointerButton.Middle);
+                        break;
+                    case (uint)WndProcMessages.WM_RBUTTONDOWN:
+                        SendPointerPressed(location, PointerButton.Right);
+                        break;
+                }
+            }
+        }
+
+        return PInvoke.CallNextHookEx(mouseHandle, nCode, wParam, lParam);
+    }
+
+    private unsafe void RemoveHook()
+    {
+        if (mouseHandle is not null && mouseHandle.DangerousGetHandle() != nint.Zero)
+        {
+            PInvoke.UnhookWindowsHookEx((HHOOK)mouseHandle.DangerousGetHandle());
+        }
+    }
+
+    private void SendPointerMoved(PointerLocation location)
+    {
+        if (isPointerPressed)
+        {
+            if (!isPointerDrag)
+            {
+                isPointerDrag = true;
+            }
+
+            messenger.Send(new PointerDrag(location));
+        }
+
+        messenger.Send(new PointerMoved(location));
+    }
+
+    private void SendPointerPressed(PointerLocation location, PointerButton button)
+    {
+        isPointerPressed = true;
+        messenger.Send(new PointerPressed(location, button));
+    }
+
+    private void SendPointerReleased(PointerLocation location, PointerButton button)
+    {
+        if (isPointerPressed)
+        {
+            if (isPointerDrag)
+            {
+                isPointerDrag = false;
+                messenger.Send(new PointerDragReleased(location, button));
+            }
+
+            isPointerPressed = false;
+            messenger.Send(new PointerReleased(location, button));
+        }
+    }
+}