Native.cs

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

namespace WindowTinter
{
    /// <summary>
    /// 全部 Win32 P/Invoke 声明集中在此。
    /// </summary>
    internal static class Native
    {
        // ---- 窗口扩展样式 ----
        public const int GWL_EXSTYLE = -20;
        public const int WS_EX_LAYERED = 0x80000;
        public const int WS_EX_TOPMOST = 0x8;
        public const int WS_EX_TRANSPARENT = 0x20;

        // ---- SetWindowPos ----
        public static readonly IntPtr HWND_TOPMOST = new IntPtr(-1);
        public const uint SWP_NOACTIVATE = 0x0010;
        public const uint SWP_SHOWWINDOW = 0x0040;
        public const uint SWP_HIDEWINDOW = 0x0080;

        // ---- 分层窗口属性 ----
        public const int LWA_ALPHA = 0x2;

        [StructLayout(LayoutKind.Sequential)]
        public struct RECT
        {
            public int Left, Top, Right, Bottom;
            public int Width => Right - Left;
            public int Height => Bottom - Top;
        }

        // ---- user32：窗口枚举 / 文本 / 进程 ----
        public delegate bool EnumWindowsProc(IntPtr hwnd, IntPtr lParam);

        [DllImport("user32.dll")]
        public static extern bool EnumWindows(EnumWindowsProc lpEnumFunc, IntPtr lParam);

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

        [DllImport("user32.dll")]
        public static extern int GetWindowTextLength(IntPtr hWnd);

        [DllImport("user32.dll")]
        public static extern uint GetWindowThreadProcessId(IntPtr hWnd, out uint lpdwProcessId);

        [DllImport("user32.dll")]
        public static extern bool IsWindowVisible(IntPtr hWnd);

        [DllImport("user32.dll")]
        public static extern bool IsIconic(IntPtr hWnd);

        [DllImport("user32.dll")]
        public static extern bool IsWindow(IntPtr hWnd);

        [DllImport("user32.dll")]
        public static extern IntPtr GetForegroundWindow();

        // ---- user32：几何 / 样式 ----
        [DllImport("user32.dll")]
        public static extern bool GetWindowRect(IntPtr hWnd, out RECT lpRect);

        [DllImport("user32.dll")]
        public static extern bool SetWindowPos(IntPtr hWnd, IntPtr hWndInsertAfter, int X, int Y, int cx, int cy, uint uFlags);

        [DllImport("user32.dll", EntryPoint = "GetWindowLongPtrW")]
        public static extern IntPtr GetWindowLongPtr(IntPtr hWnd, int nIndex);

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

        [DllImport("user32.dll")]
        public static extern bool SetLayeredWindowAttributes(IntPtr hwnd, uint crKey, byte bAlpha, uint dwFlags);

        // ---- user32：UpdateLayeredWindow（逐像素 alpha 合成）----
        public const uint ULW_ALPHA = 0x00000002;
        public const byte AC_SRC_ALPHA = 1;

        [StructLayout(LayoutKind.Sequential)]
        public struct BLENDFUNCTION
        {
            public byte BlendOp;
            public byte BlendFlags;
            public byte SourceConstantAlpha;
            public byte AlphaFormat;
        }

        [DllImport("user32.dll")]
        public static extern bool UpdateLayeredWindow(
            IntPtr hWnd, IntPtr hdcDst,
            ref Point pptDst, ref Size psize,
            IntPtr hdcSrc, ref Point pptSrc,
            uint crKey, ref BLENDFUNCTION pblend, uint dwFlags);

        // ---- gdi32：DC / 位图管理 ----
        [DllImport("gdi32.dll")]
        public static extern IntPtr CreateCompatibleDC(IntPtr hdc);

        [DllImport("gdi32.dll")]
        public static extern IntPtr SelectObject(IntPtr hdc, IntPtr hgdiobj);

        [DllImport("gdi32.dll")]
        public static extern bool DeleteDC(IntPtr hdc);

        [DllImport("user32.dll")]
        public static extern IntPtr GetDC(IntPtr hWnd);

        [DllImport("user32.dll")]
        public static extern int ReleaseDC(IntPtr hWnd, IntPtr hDC);

        // ---- user32：窗口 DC（拾取器高亮边框用）----
        [DllImport("user32.dll")]
        public static extern IntPtr GetWindowDC(IntPtr hWnd);

        // ---- gdi32：PatBlt（反转绘制，拾取器高亮边框）----
        public const uint DSTINVERT = 0x00550009;

        [DllImport("gdi32.dll")]
        public static extern bool PatBlt(IntPtr hdc, int nXLeft, int nYLeft, int nWidth, int nHeight, uint dwRop);

        [DllImport("gdi32.dll")]
        public static extern bool DeleteObject(IntPtr hObject);

        // ---- gdi32：区域创建（圆角矩形裁剪用）----
        [DllImport("gdi32.dll")]
        public static extern IntPtr CreateRoundRectRgn(int x1, int y1, int x2, int y2, int cx, int cy);

        [DllImport("gdi32.dll")]
        public static extern IntPtr CreateRectRgn(int x1, int y1, int x2, int y2);

        // ---- user32：设置窗口区域 ----
        [DllImport("user32.dll")]
        public static extern int SetWindowRgn(IntPtr hWnd, IntPtr hRgn, bool bRedraw);

        // ---- dwmapi：标题栏深色模式 (Windows 10 2004+) ----
        public const int DWMWA_USE_IMMERSIVE_DARK_MODE = 20;

        [DllImport("dwmapi.dll")]
        public static extern int DwmSetWindowAttribute(IntPtr hwnd, int attr, ref int pvAttr, int cbAttr);

        // ---- dwmapi：扩展框架边界（排除 DWM 阴影后的真实可见矩形）----
        public const int DWMWA_EXTENDED_FRAME_BOUNDS = 9;

        [DllImport("dwmapi.dll")]
        public static extern int DwmGetWindowAttribute(IntPtr hwnd, int dwAttribute, out RECT pvAttribute, int cbAttribute);

        /// <summary>取真实可见矩形（排除 DWM 阴影），失败时回退 GetWindowRect。</summary>
        public static RECT GetVisibleWindowRect(IntPtr hwnd)
        {
            var r = default(RECT);
            // DwmGetWindowAttribute 仅在 Windows Vista+ 可用，我们的 target 是 net6-windows 没问题
            int hr = DwmGetWindowAttribute(hwnd, DWMWA_EXTENDED_FRAME_BOUNDS, out r, Marshal.SizeOf<RECT>());
            if (hr != 0 && !GetWindowRect(hwnd, out r))
                r = default; // 双重回退均失败，返回全零（调用方有 w<=0 防护）
            return r;
        }

        // ---- user32：拾取窗口 ----
        [DllImport("user32.dll")]
        public static extern IntPtr GetAncestor(IntPtr hwnd, uint gaFlags);

        public const uint GA_ROOT = 2;

        // ---- user32：WinEvent 钩子（事件驱动更新，替代高频轮询）----
        public const uint WINEVENT_OUTOFCONTEXT = 0x0000;
        public const uint WINEVENT_SKIPOWNPROCESS = 0x0002;

        public const uint EVENT_OBJECT_LOCATIONCHANGE = 0x800B;
        public const uint EVENT_OBJECT_HIDE = 0x8004;
        public const uint EVENT_OBJECT_SHOW = 0x8006;
        public const uint EVENT_OBJECT_DESTROY = 0x8001;
        public const uint EVENT_SYSTEM_FOREGROUND = 0x0003;

        public delegate void WinEventProc(
            IntPtr hWinEventHook, uint eventType, IntPtr hwnd,
            int idObject, int idChild, uint dwEventThread, uint dwmsEventTime);

        [DllImport("user32.dll")]
        public static extern IntPtr SetWinEventHook(
            uint eventMin, uint eventMax, IntPtr hmodWinEventProc,
            WinEventProc pfnWinEventProc, uint idProcess, uint idThread, uint dwFlags);

        [DllImport("user32.dll")]
        public static extern bool UnhookWinEvent(IntPtr hWinEventHook);

        // ---- uxtheme：深色滚动条 ----
        [DllImport("uxtheme.dll", CharSet = CharSet.Unicode)]
        public static extern int SetWindowTheme(IntPtr hwnd, string pszSubAppName, string pszSubIdList);

        // ---- user32：重绘 ----
        [DllImport("user32.dll")]
        public static extern bool InvalidateRect(IntPtr hWnd, IntPtr lpRect, bool bErase);

        [DllImport("user32.dll")]
        public static extern bool RedrawWindow(IntPtr hWnd, IntPtr lprcUpdate, IntPtr hrgnUpdate, uint flags);

        public const uint RDW_INVALIDATE = 0x0001;
        public const uint RDW_ERASE = 0x0004;
        public const uint RDW_FRAME = 0x0400;
        public const uint RDW_ALLCHILDREN = 0x0080;

        // ---- 提权检测：目标窗口以管理员运行、本程序非提权时无法修改其透明度 ----
        public const uint PROCESS_QUERY_INFORMATION = 0x0400;
        public const uint TOKEN_QUERY = 0x0008;

        [StructLayout(LayoutKind.Sequential)]
        public struct TOKEN_ELEVATION
        {
            public uint TokenIsElevated;
        }

        [DllImport("advapi32.dll")]
        public static extern bool OpenProcessToken(IntPtr processHandle, uint desiredAccess, out IntPtr tokenHandle);

        [DllImport("advapi32.dll")]
        public static extern bool GetTokenInformation(IntPtr tokenHandle, int tokenInformationClass,
            out TOKEN_ELEVATION tokenInformation, uint tokenInformationLength, out uint returnLength);

        [DllImport("kernel32.dll")]
        public static extern IntPtr OpenProcess(uint desiredAccess, bool inheritHandle, uint processId);

        [DllImport("kernel32.dll")]
        public static extern bool CloseHandle(IntPtr hObject);
    }
}