Avalonia/samples/IntegrationTestApp/Embedding/WinApi.cs

using System;
using System.Runtime.InteropServices;
using System.Text;

namespace IntegrationTestApp.Embedding;

internal class WinApi
{
    public const int GWL_WNDPROC = -4;
    public const uint TME_HOVER = 1;
    public const uint TME_LEAVE = 2;
    public const uint WM_CONTEXTMENU = 0x007B;
    public const uint WM_MOUSELEAVE = 0x02A3;
    public const uint WM_MOUSEHOVER = 0x02A1;
    public const uint WM_MOUSEMOVE = 0x0200;

    public delegate IntPtr WndProcDelegate(IntPtr hWnd, uint msg, IntPtr wParam, IntPtr lParam);

    [Flags]
    public enum WindowStyles : uint
    {
        WS_BORDER = 0x800000,
        WS_CAPTION = 0xc00000,
        WS_CHILD = 0x40000000,
        WS_CLIPCHILDREN = 0x2000000,
        WS_CLIPSIBLINGS = 0x4000000,
        WS_DISABLED = 0x8000000,
        WS_DLGFRAME = 0x400000,
        WS_GROUP = 0x20000,
        WS_HSCROLL = 0x100000,
        WS_MAXIMIZE = 0x1000000,
        WS_MAXIMIZEBOX = 0x10000,
        WS_MINIMIZE = 0x20000000,
        WS_MINIMIZEBOX = 0x20000,
        WS_OVERLAPPED = 0x0,
        WS_OVERLAPPEDWINDOW = WS_OVERLAPPED | WS_CAPTION | WS_SYSMENU | WS_THICKFRAME | WS_MINIMIZEBOX | WS_MAXIMIZEBOX,
        WS_POPUP = 0x80000000u,
        WS_POPUPWINDOW = WS_POPUP | WS_BORDER | WS_SYSMENU,
        WS_SYSMENU = 0x80000,
        WS_TABSTOP = 0x10000,
        WS_THICKFRAME = 0x40000,
        WS_VISIBLE = 0x10000000,
        WS_VSCROLL = 0x200000,
        WS_EX_DLGMODALFRAME = 0x00000001,
        WS_EX_NOPARENTNOTIFY = 0x00000004,
        WS_EX_NOREDIRECTIONBITMAP = 0x00200000,
        WS_EX_TOPMOST = 0x00000008,
        WS_EX_ACCEPTFILES = 0x00000010,
        WS_EX_TRANSPARENT = 0x00000020,
        WS_EX_MDICHILD = 0x00000040,
        WS_EX_TOOLWINDOW = 0x00000080,
        WS_EX_WINDOWEDGE = 0x00000100,
        WS_EX_CLIENTEDGE = 0x00000200,
        WS_EX_CONTEXTHELP = 0x00000400,
        WS_EX_RIGHT = 0x00001000,
        WS_EX_LEFT = 0x00000000,
        WS_EX_RTLREADING = 0x00002000,
        WS_EX_LTRREADING = 0x00000000,
        WS_EX_LEFTSCROLLBAR = 0x00004000,
        WS_EX_RIGHTSCROLLBAR = 0x00000000,
        WS_EX_CONTROLPARENT = 0x00010000,
        WS_EX_STATICEDGE = 0x00020000,
        WS_EX_APPWINDOW = 0x00040000,
        WS_EX_OVERLAPPEDWINDOW = WS_EX_WINDOWEDGE | WS_EX_CLIENTEDGE,
        WS_EX_PALETTEWINDOW = WS_EX_WINDOWEDGE | WS_EX_TOOLWINDOW | WS_EX_TOPMOST,
        WS_EX_LAYERED = 0x00080000,
        WS_EX_NOINHERITLAYOUT = 0x00100000,
        WS_EX_LAYOUTRTL = 0x00400000,
        WS_EX_COMPOSITED = 0x02000000,
        WS_EX_NOACTIVATE = 0x08000000
    }

    [DllImport("user32.dll", SetLastError = true)]
    public static extern IntPtr CallWindowProc(IntPtr lpPrevWndFunc, IntPtr hWnd, uint Msg, IntPtr wParam, IntPtr lParam);

    [DllImport("user32.dll", SetLastError = true)]
    public static extern bool DestroyWindow(IntPtr hwnd);

    [DllImport("kernel32.dll")]
    public static extern IntPtr GetModuleHandle(string? lpModuleName);

    [DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
    public static extern int GetWindowText(IntPtr hWnd, StringBuilder lpString, int nMaxCount);


    [DllImport("user32.dll", SetLastError = true)]
    public static extern IntPtr CreateWindowEx(
        int dwExStyle,
        string lpClassName,
        string lpWindowName,
        uint dwStyle,
        int x,
        int y,
        int nWidth,
        int nHeight,
        IntPtr hWndParent,
        IntPtr hMenu,
        IntPtr hInstance,
        IntPtr lpParam);

    [DllImport("user32.dll", SetLastError = true)]
    public static extern IntPtr SetWindowLongPtr(IntPtr hWnd, int nIndex, IntPtr dwNewLong);

    [DllImport("user32.dll", SetLastError = true, CharSet = CharSet.Auto)]
    public static extern bool SetWindowText(IntPtr hwnd, String lpString);

    [DllImport("user32.dll")]
    public static extern bool TrackMouseEvent(ref TRACKMOUSEEVENT lpEventTrack);

    [StructLayout(LayoutKind.Sequential)]
    public struct TRACKMOUSEEVENT
    {
        public int cbSize;
        public uint dwFlags;
        public IntPtr hwndTrack;
        public uint dwHoverTime;
    }
}