MonitorWindowsRestore/NativeMethods.cs at master · kirbyfu/MonitorWindowsRestore · GitHub

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

namespace MonitorWindowsRestore;

public static class NativeMethods
{
    public delegate bool EnumWindowsProc(IntPtr hWnd, IntPtr lParam);

    public delegate void WinEventDelegate(
        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,
        WinEventDelegate lpfnWinEventProc, uint idProcess, uint idThread, uint dwFlags);

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

    public const uint EVENT_SYSTEM_FOREGROUND = 0x0003;
    public const uint EVENT_OBJECT_LOCATIONCHANGE = 0x800B;
    public const uint WINEVENT_OUTOFCONTEXT = 0x0000;
    public const int OBJID_WINDOW = 0;

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

    [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 IsZoomed(IntPtr hWnd);

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

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

    [DllImport("user32.dll", CharSet = CharSet.Unicode)]
    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 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")]
    public static extern bool ShowWindow(IntPtr hWnd, int nCmdShow);

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

    [StructLayout(LayoutKind.Sequential)]
    public struct RECT
    {
        public int Left;
        public int Top;
        public int Right;
        public int Bottom;
    }

    public const int GWL_STYLE = -16;
    public const int GWL_EXSTYLE = -20;
    public const long WS_VISIBLE = 0x10000000L;
    public const long WS_EX_TOOLWINDOW = 0x00000080L;
    public const long WS_EX_APPWINDOW = 0x00040000L;

    public const int SW_RESTORE = 9;
    public const int SW_MAXIMIZE = 3;
    public const int SW_SHOW = 5;

    public static readonly IntPtr HWND_TOP = IntPtr.Zero;

    public const uint SWP_NOZORDER = 0x0004;
    public const uint SWP_NOACTIVATE = 0x0010;
    public const uint SWP_SHOWWINDOW = 0x0040;

    public static string GetWindowTitle(IntPtr hWnd)
    {
        int length = GetWindowTextLength(hWnd);
        if (length == 0) return "";

        var sb = new StringBuilder(length + 1);
        GetWindowText(hWnd, sb, sb.Capacity);
        return sb.ToString();
    }

    public static bool IsAppWindow(IntPtr hWnd)
    {
        if (!IsWindowVisible(hWnd)) return false;

        long exStyle = GetWindowLongPtr(hWnd, GWL_EXSTYLE).ToInt64();

        // Skip tool windows unless they're also app windows
        if ((exStyle & WS_EX_TOOLWINDOW) != 0 && (exStyle & WS_EX_APPWINDOW) == 0)
            return false;

        // Must have a title
        return GetWindowTextLength(hWnd) > 0;
    }
}