WindowNativeMethods.cs

namespace Microsoft.WindowsAPICodePack.Shell;

internal static class WindowNativeMethods
{
    [DllImport("user32.dll", SetLastError = true)]
    public static extern IntPtr FindWindowEx(IntPtr parentHandle, IntPtr childAfter, string className, IntPtr windowTitle);
    /// <summary>
    /// Changes an attribute of the specified window. The function also sets the 32-bit (long) value at the specified offset into the extra window memory.
    /// </summary>
    /// <param name="hWnd">A handle to the window and, indirectly, the class to which the window belongs..</param>
    /// <param name="nIndex">
    /// The zero-based offset to the value to be set. Valid values are in the range zero through the number of bytes of extra window memory, minus the size of an integer.
    /// To set any other value, specify one of the following values: GWL_EXSTYLE, GWL_HINSTANCE, GWL_ID, GWL_STYLE, GWL_USERDATA, GWL_WNDPROC.
    /// </param>
    /// <param name="dwNewLong">The replacement value.</param>
    /// <returns>If the function succeeds, the return value is the previous value of the specified 32-bit integer.
    /// If the function fails, the return value is zero. To get extended error information, call GetLastError. </returns>
    [DllImport("user32.dll", SetLastError = true)]
    public static extern int SetWindowLong(IntPtr hWnd, int nIndex, int dwNewLong);
    [DllImport("user32.dll", SetLastError = true)]
    public static extern int GetWindowLong(IntPtr hWnd, int nIndex);
    [DllImport("user32.dll", CharSet = CharSet.Auto)]
    public static extern bool SetWindowPos(IntPtr hWnd, IntPtr hWndInsertAfter, int x, int y, int width, int height, SetWindowPosFlags flags);
    
    /// <summary>
    /// Retrieves the handle to the parent window of the specified window.
    /// </summary>
    /// <param name="hWnd">A handle to the window whose parent window handle is to be retrieved.</param>
    /// <returns>If the window is a child window, the return value is a handle to the parent window. If the window is a top-level window, the return value is IntPtr.Zero.</returns>
    [DllImport("user32.dll", SetLastError = true)]
    public static extern IntPtr GetParent(IntPtr hWnd);
}

internal enum WindowLongFlags
{
    GWL_EXSTYLE = -20,
    GWLP_HINSTANCE = -6,
    GWLP_HWNDPARENT = -8,
    GWL_ID = -12,
    GWL_STYLE = -16,
    GWL_USERDATA = -21,
    GWL_WNDPROC = -4,
    DWLP_USER = 0x8,
    DWLP_MSGRESULT = 0x0,
    DWLP_DLGPROC = 0x4
}

[Flags]
internal enum SetWindowPosFlags
{
    SWP_NOSIZE = 0x0001,
    SWP_NOMOVE = 0x0002,
    SWP_NOZORDER = 0x0004,
    SWP_NOREDRAW = 0x0008,
    SWP_NOACTIVATE = 0x0010,
    SWP_FRAMECHANGED = 0x0020,
    SWP_SHOWWINDOW = 0x0040,
    SWP_HIDEWINDOW = 0x0080,
    SWP_NOCOPYBITS = 0x0100,
    SWP_NOOWNERZORDER = 0x0200,
    SWP_NOSENDCHANGING = 0x0400,
    SWP_DRAWFRAME = 0x0020,
    SWP_NOREPOSITION = 0x0200,
    SWP_DEFERERASE = 0x2000,
    SWP_ASYNCWINDOWPOS = 0x4000,
}