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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,91 @@ | ||
| using System; | ||
| using System.Runtime.InteropServices; | ||
| using WinRT; | ||
| using static PInvoke.User32; | ||
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| namespace LipUI; | ||
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| internal partial class MainWindow | ||
| { | ||
| private readonly int MinWidth = 800; | ||
| private readonly int MinHeight = 450; | ||
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| private NativeMethods.WinProc? newWndProc = null; | ||
| private nint oldWndProc = nint.Zero; | ||
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| private void SubClassing() | ||
| { | ||
| var hwnd = this.As<NativeMethods.IWindowNative>().WindowHandle; | ||
| if (hwnd == nint.Zero) | ||
| { | ||
| int error = Marshal.GetLastWin32Error(); | ||
| throw new InvalidOperationException($"Failed to get window handler: error code {error}"); | ||
| } | ||
|
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| newWndProc = new(NewWindowProc); | ||
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| // Here we use the NativeMethods class 👇 | ||
| oldWndProc = NativeMethods.SetWindowLong(hwnd, WindowLongIndexFlags.GWL_WNDPROC, newWndProc); | ||
| if (oldWndProc == nint.Zero) | ||
| { | ||
| int error = Marshal.GetLastWin32Error(); | ||
| throw new InvalidOperationException($"Failed to set GWL_WNDPROC: error code {error}"); | ||
| } | ||
| } | ||
|
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| private nint NewWindowProc(nint hWnd, WindowMessage Msg, nint wParam, nint lParam) | ||
| { | ||
| [DllImport("user32.dll")] | ||
| static extern nint CallWindowProc(nint lpPrevWndFunc, nint hWnd, WindowMessage Msg, nint wParam, nint lParam); | ||
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| switch (Msg) | ||
| { | ||
| case WindowMessage.WM_GETMINMAXINFO: | ||
| var dpi = GetDpiForWindow(hWnd); | ||
| float scalingFactor = (float)dpi / 96; | ||
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| MINMAXINFO minMaxInfo = Marshal.PtrToStructure<MINMAXINFO>(lParam); | ||
| minMaxInfo.ptMinTrackSize.x = (int)(MinWidth * scalingFactor); | ||
| minMaxInfo.ptMinTrackSize.y = (int)(MinHeight * scalingFactor); | ||
| Marshal.StructureToPtr(minMaxInfo, lParam, true); | ||
| break; | ||
|
|
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| } | ||
| return CallWindowProc(oldWndProc, hWnd, Msg, wParam, lParam); | ||
| } | ||
|
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| private static class NativeMethods | ||
| { | ||
| [StructLayout(LayoutKind.Sequential)] | ||
| struct MINMAXINFO | ||
| { | ||
| public PInvoke.POINT ptReserved; | ||
| public PInvoke.POINT ptMaxSize; | ||
| public PInvoke.POINT ptMaxPosition; | ||
| public PInvoke.POINT ptMinTrackSize; | ||
| public PInvoke.POINT ptMaxTrackSize; | ||
| } | ||
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| public delegate nint WinProc(nint hWnd, WindowMessage Msg, nint wParam, nint lParam); | ||
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| // We have to handle the 32-bit and 64-bit functions separately. | ||
| // 'SetWindowLongPtr' is the 64-bit version of 'SetWindowLong', and isn't available in user32.dll for 32-bit processes. | ||
| [DllImport("user32.dll", EntryPoint = "SetWindowLong")] | ||
| private static extern nint SetWindowLong32(nint hWnd, WindowLongIndexFlags nIndex, WinProc newProc); | ||
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| [DllImport("user32.dll", EntryPoint = "SetWindowLongPtr")] | ||
| private static extern nint SetWindowLong64(nint hWnd, WindowLongIndexFlags nIndex, WinProc newProc); | ||
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| public static nint SetWindowLong(nint hWnd, WindowLongIndexFlags nIndex, WinProc newProc) | ||
| => nint.Size is 4 ? SetWindowLong32(hWnd, nIndex, newProc) : SetWindowLong64(hWnd, nIndex, newProc); | ||
|
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| [ComImport] | ||
| [InterfaceType(ComInterfaceType.InterfaceIsIUnknown)] | ||
| [Guid("EECDBF0E-BAE9-4CB6-A68E-9598E1CB57BB")] | ||
| internal interface IWindowNative | ||
| { | ||
| nint WindowHandle { get; } | ||
| } | ||
| } | ||
| } |
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