greenshot/GreenshotPlugin/Core/WindowDetails.cs

using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Drawing;
using System.Drawing.Imaging;
using System.Runtime.InteropServices;
using System.Text;
using System.Text.RegularExpressions;
using System.Windows.Forms;
using GreenshotPlugin.IniFile;
using GreenshotPlugin.Interfaces;
using GreenshotPlugin.Interop;
using GreenshotPlugin.UnmanagedHelpers;
using GreenshotPlugin.UnmanagedHelpers.Enums;
using GreenshotPlugin.UnmanagedHelpers.Structs;
using log4net;

namespace GreenshotPlugin.Core
{
    /// <summary>
    /// Code for handling with "windows"
    /// Main code is taken from vbAccelerator, location:
    /// http://www.vbaccelerator.com/home/NET/Code/Libraries/Windows/Enumerating_Windows/article.asp
    /// but a LOT of changes/enhancements were made to adapt it for Greenshot.
    ///
    /// Provides details about a Window returned by the  enumeration
    /// </summary>
    public class WindowDetails : IEquatable<WindowDetails>{
        private const string MetroWindowsClass = "Windows.UI.Core.CoreWindow"; //Used for Windows 8(.1)
        private const string FramedAppClass = "ApplicationFrameWindow"; // Windows 10 uses ApplicationFrameWindow
        private const string MetroApplauncherClass = "ImmersiveLauncher";
        private const string MetroGutterClass = "ImmersiveGutter";
        private static readonly IList<string> IgnoreClasses = new List<string>(new[] { "Progman", "Button", "Dwm" }); //"MS-SDIa"

        private static readonly ILog Log = LogManager.GetLogger(typeof(WindowDetails));
        private static readonly CoreConfiguration Conf = IniConfig.GetIniSection<CoreConfiguration>();
        private static readonly IList<IntPtr> IgnoreHandles = new List<IntPtr>();
        private static readonly IList<string> ExcludeProcessesFromFreeze = new List<string>();
        private static readonly IAppVisibility AppVisibility;

        static WindowDetails() {
            try
            {
                // Only try to instantiate when Windows 8 or later.
                if (WindowsVersion.IsWindows8OrLater)
                {
                    AppVisibility = COMWrapper.CreateInstance<IAppVisibility>();
                }
            }
            catch (Exception ex)
            {
                Log.WarnFormat("Couldn't create instance of IAppVisibility: {0}", ex.Message);
            }
        }

        public static void AddProcessToExcludeFromFreeze(string processName) {
            if (!ExcludeProcessesFromFreeze.Contains(processName)) {
                ExcludeProcessesFromFreeze.Add(processName);
            }
        }

        internal static bool IsIgnoreHandle(IntPtr handle) {
            return IgnoreHandles.Contains(handle);
        }

        private IList<WindowDetails> _childWindows;
        private IntPtr _parentHandle = IntPtr.Zero;
        private WindowDetails _parent;
        private bool _frozen;

        /// <summary>
        /// This checks if the window is a Windows 8 App
        /// For Windows 10 most normal code works, as it's hosted inside "ApplicationFrameWindow"
        /// </summary>
        public bool IsApp => MetroWindowsClass.Equals(ClassName);

        /// <summary>
        /// This checks if the window is a Windows 10 App
        /// For Windows 10 apps are hosted inside "ApplicationFrameWindow"
        /// </summary>
        public bool IsWin10App => FramedAppClass.Equals(ClassName);

        /// <summary>
        /// Check if the window is the metro gutter (sizeable separator)
        /// </summary>
        public bool IsGutter => MetroGutterClass.Equals(ClassName);

        /// <summary>
        /// Test if this window is for the App-Launcher
        /// </summary>
        public bool IsAppLauncher => MetroApplauncherClass.Equals(ClassName);

        /// <summary>
        /// Check if this window is the window of a metro app
        /// </summary>
        public bool IsMetroApp => IsAppLauncher || IsApp;

        /// <summary>
        /// To allow items to be compared, the hash code
        /// is set to the Window handle, so two EnumWindowsItem
        /// objects for the same Window will be equal.
        /// </summary>
        /// <returns>The Window Handle for this window</returns>
        public override int GetHashCode() {
            return Handle.ToInt32();
        }

        public override bool Equals(object right) {
            return Equals(right as WindowDetails);
        }

        /// <summary>
        /// Compare two windows details
        /// </summary>
        /// <param name="other"></param>
        /// <returns></returns>
        public bool Equals(WindowDetails other) {
            if (other is null) {
                return false;
            }

            if (ReferenceEquals(this, other)) {
                return true;
            }

            if (GetType() != other.GetType()){
                return false;
            }
            return other.Handle == Handle;
        }

        /// <summary>
        /// Check if the window has children
        /// </summary>
        public bool HasChildren => (_childWindows != null) && (_childWindows.Count > 0);

        /// <summary>
        /// Freeze information updates
        /// </summary>
        public void FreezeDetails() {
            _frozen = true;
        }

        /// <summary>
        /// Make the information update again.
        /// </summary>
        public void UnfreezeDetails() {
            _frozen = false;
        }

        /// <summary>
        /// Get the file path to the exe for the process which owns this window
        /// </summary>
        public string ProcessPath {
            get {
                if (Handle == IntPtr.Zero) {
                    // not a valid window handle
                    return string.Empty;
                }
                // Get the process id
                User32.GetWindowThreadProcessId(Handle, out var processId);
                return Kernel32.GetProcessPath(processId);
            }
        }


        /// <summary>
        /// Get the icon belonging to the process
        /// </summary>
        public Image DisplayIcon {
            get {
                try
                {
                    using var appIcon = GetAppIcon(Handle);
                    if (appIcon != null) {
                        return appIcon.ToBitmap();
                    }
                } catch (Exception ex) {
                    Log.WarnFormat("Couldn't get icon for window {0} due to: {1}", Text, ex.Message);
                    Log.Warn(ex);
                }
                if (IsMetroApp) {
                    // No method yet to get the metro icon
                    return null;
                }
                try {
                    return PluginUtils.GetCachedExeIcon(ProcessPath, 0);
                } catch (Exception ex) {
                    Log.WarnFormat("Couldn't get icon for window {0} due to: {1}", Text, ex.Message);
                    Log.Warn(ex);
                }
                return null;
            }
        }

        /// <summary>
        /// Get the icon for a hWnd
        /// </summary>
        /// <param name="hwnd"></param>
        /// <returns></returns>
        private static Icon GetAppIcon(IntPtr hwnd) {
            IntPtr iconSmall = IntPtr.Zero;
            IntPtr iconBig = new IntPtr(1);
            IntPtr iconSmall2 = new IntPtr(2);

            IntPtr iconHandle;
            if (Conf.UseLargeIcons) {
                iconHandle = User32.SendMessage(hwnd, (int)WindowsMessages.WM_GETICON, iconBig, IntPtr.Zero);
                if (iconHandle == IntPtr.Zero) {
                    iconHandle = User32.GetClassLongWrapper(hwnd, (int)ClassLongIndex.GCL_HICON);
                }
            } else {
                iconHandle = User32.SendMessage(hwnd, (int)WindowsMessages.WM_GETICON, iconSmall2, IntPtr.Zero);
            }
            if (iconHandle == IntPtr.Zero) {
                iconHandle = User32.SendMessage(hwnd, (int)WindowsMessages.WM_GETICON, iconSmall, IntPtr.Zero);
            }
            if (iconHandle == IntPtr.Zero) {
                iconHandle = User32.GetClassLongWrapper(hwnd, (int)ClassLongIndex.GCL_HICONSM);
            }
            if (iconHandle == IntPtr.Zero) {
                iconHandle = User32.SendMessage(hwnd, (int)WindowsMessages.WM_GETICON, iconBig, IntPtr.Zero);
            }
            if (iconHandle == IntPtr.Zero) {
                iconHandle = User32.GetClassLongWrapper(hwnd, (int)ClassLongIndex.GCL_HICON);
            }

            if (iconHandle == IntPtr.Zero) {
                return null;
            }

            Icon icon = Icon.FromHandle(iconHandle);

            return icon;
        }

        /// <summary>
        /// Use this to make remove internal windows, like the mainform and the captureforms, invisible
        /// </summary>
        /// <param name="ignoreHandle"></param>
        public static void RegisterIgnoreHandle(IntPtr ignoreHandle) {
            IgnoreHandles.Add(ignoreHandle);
        }

        /// <summary>
        /// Use this to remove the with RegisterIgnoreHandle registered handle
        /// </summary>
        /// <param name="ignoreHandle"></param>
        public static void UnregisterIgnoreHandle(IntPtr ignoreHandle) {
            IgnoreHandles.Remove(ignoreHandle);
        }

        public IList<WindowDetails> Children {
            get {
                if (_childWindows == null) {
                    GetChildren();
                }
                return _childWindows;
            }
        }

        /// <summary>
        /// Retrieve all windows with a certain title or classname
        /// </summary>
        /// <param name="windows">IEnumerable</param>
        /// <param name="titlePattern">The regexp to look for in the title</param>
        /// <param name="classnamePattern">The regexp to look for in the classname</param>
        /// <returns>IEnumerable WindowDetails with all the found windows</returns>
        private static IEnumerable<WindowDetails> FindWindow(IEnumerable<WindowDetails> windows, string titlePattern, string classnamePattern) {
            Regex titleRegexp = null;
            Regex classnameRegexp = null;

            if (titlePattern != null && titlePattern.Trim().Length > 0) {
                titleRegexp = new Regex(titlePattern);
            }
            if (classnamePattern != null && classnamePattern.Trim().Length > 0) {
                classnameRegexp = new Regex(classnamePattern);
            }

            foreach(WindowDetails window in windows) {
                if (titleRegexp != null && titleRegexp.IsMatch(window.Text)) {
                    yield return window;
                } else if (classnameRegexp != null && classnameRegexp.IsMatch(window.ClassName)) {
                    yield return window;
                }
            }
        }

        /// <summary>
        /// Retrieve the child with matching classname
        /// </summary>
        public WindowDetails GetChild(string childClassname) {
            foreach(var child in Children) {
                if (childClassname.Equals(child.ClassName)) {
                    return child;
                }
            }
            return null;
        }

        /// <summary>
        /// Retrieve the children with matching classname
        /// </summary>
        public IEnumerable<WindowDetails> GetChilden(string childClassname) {
            foreach (var child in Children) {
                if (childClassname.Equals(child.ClassName)) {
                    yield return child;
                }
            }
        }

        public IntPtr ParentHandle {
            get {
                if (_parentHandle == IntPtr.Zero) {
                    _parentHandle = User32.GetParent(Handle);
                    _parent = null;
                }
                return _parentHandle;
            }
            set {
                if (_parentHandle != value) {
                    _parentHandle = value;
                    _parent = null;
                }
            }
        }
        /// <summary>
        /// Get the parent of the current window
        /// </summary>
        /// <returns>WindowDetails of the parent, or null if none</returns>
        public WindowDetails GetParent() {
            if (_parent == null) {
                if (_parentHandle == IntPtr.Zero) {
                    _parentHandle = User32.GetParent(Handle);
                }
                if (_parentHandle != IntPtr.Zero) {
                    _parent = new WindowDetails(_parentHandle);
                }
            }
            return _parent;
        }

        /// <summary>
        /// Retrieve all the children, this only stores the children internally.
        /// One should normally use the getter "Children"
        /// </summary>
        public IList<WindowDetails> GetChildren() {
            if (_childWindows == null) {
                return GetChildren(0);
            }
            return _childWindows;
        }

        /// <summary>
        /// Retrieve all the children, this only stores the children internally, use the "Children" property for the value
        /// </summary>
        /// <param name="levelsToGo">Specify how many levels we go in</param>
        public IList<WindowDetails> GetChildren(int levelsToGo) {
            if (_childWindows != null)
            {
                return _childWindows;
            }
            _childWindows = new WindowsEnumerator().GetWindows(Handle, null).Items;
            foreach(var childWindow in _childWindows) {
                if (levelsToGo > 0) {
                    childWindow.GetChildren(levelsToGo-1);
                }
            }
            return _childWindows;
        }

        /// <summary>
        /// Retrieve children with a certain title or classname
        /// </summary>
        /// <param name="titlePattern">The regexp to look for in the title</param>
        /// <param name="classnamePattern">The regexp to look for in the classname</param>
        /// <returns>List WindowDetails with all the found windows, or an empty list</returns>
        public IEnumerable<WindowDetails> FindChildren(string titlePattern, string classnamePattern) {
            return FindWindow(Children, titlePattern, classnamePattern);
        }

        /// <summary>
        /// Recurse-ing helper method for the FindPath
        /// </summary>
        /// <param name="classNames">List string with classNames</param>
        /// <param name="index">The index in the list to look for</param>
        /// <returns>WindowDetails if a match was found</returns>
        private WindowDetails FindPath(IList<string> classNames, int index) {
            if (index == classNames.Count - 1) {
                foreach (var foundWindow in FindChildren(null, classNames[index]))
                {
                    return foundWindow;
                }
            } else {
                foreach(var foundWindow in FindChildren(null, classNames[index]))
                {
                    var resultWindow = foundWindow.FindPath(classNames, index+1);
                    if (resultWindow != null)
                    {
                        return resultWindow;
                    }
                }
            }
            return null;
        }

        /// <summary>
        /// This method will find the child window according to a path of classNames.
        /// Usually used for finding a certain "content" window like for the IE Browser
        /// </summary>
        /// <param name="classNames">List of string with classname "path"</param>
        /// <param name="allowSkip">true allows the search to skip a classname of the path</param>
        /// <returns>WindowDetails if found</returns>
        public WindowDetails FindPath(IList<string> classNames, bool allowSkip) {
            int index = 0;
            var resultWindow = FindPath(classNames, index++);
            if (resultWindow == null && allowSkip) {
                while(resultWindow == null && index < classNames.Count) {
                    resultWindow = FindPath(classNames, index);
                }
            }
            return resultWindow;
        }

        /// <summary>
        /// Deep scan for a certain classname pattern
        /// </summary>
        /// <param name="windowDetails">Window to scan into</param>
        /// <param name="classnamePattern">Classname regexp pattern</param>
        /// <returns>The first WindowDetails found</returns>
        public static WindowDetails DeepScan(WindowDetails windowDetails, Regex classnamePattern) {
            if (classnamePattern.IsMatch(windowDetails.ClassName)) {
                return windowDetails;
            }
            // First loop through this level
            foreach(var child in windowDetails.Children) {
                if (classnamePattern.IsMatch(child.ClassName)) {
                    return child;
                }
            }
            // Go into all children
            foreach(var child in windowDetails.Children) {
                var deepWindow = DeepScan(child, classnamePattern);
                if (deepWindow != null) {
                    return deepWindow;
                }
            }
            return null;
        }

        /// <summary>
        /// GetWindow
        /// </summary>
        /// <param name="gwCommand">The GetWindowCommand to use</param>
        /// <returns>null if nothing found, otherwise the WindowDetails instance of the "child"</returns>
        public WindowDetails GetWindow(GetWindowCommand gwCommand) {
            var tmphWnd = User32.GetWindow(Handle, gwCommand);
            if (IntPtr.Zero == tmphWnd) {
                return null;
            }
            var windowDetails = new WindowDetails(tmphWnd)
            {
                _parent = this
            };
            return windowDetails;
        }

        /// <summary>
        /// Gets the window's handle
        /// </summary>
        public IntPtr Handle { get; }

        private string _text;
        /// <summary>
        /// Gets the window's title (caption)
        /// </summary>
        public string Text {
            set => _text = value;
            get {
                if (_text == null) {
                    var title = new StringBuilder(260, 260);
                    User32.GetWindowText(Handle, title, title.Capacity);
                    _text = title.ToString();
                }
                return _text;
            }
        }

        private string _className;
        /// <summary>
        /// Gets the window's class name.
        /// </summary>
        public string ClassName => _className ??= GetClassName(Handle);

        /// <summary>
        /// Gets/Sets whether the window is iconic (minimized) or not.
        /// </summary>
        public bool Iconic {
            get {
                if (IsMetroApp) {
                    return !Visible;
                }
                return User32.IsIconic(Handle) || Location.X <= -32000;
            }
            set {
                if (value) {
                    User32.SendMessage(Handle,  (int)WindowsMessages.WM_SYSCOMMAND, (IntPtr)User32.SC_MINIMIZE, IntPtr.Zero);
                } else {
                    User32.SendMessage(Handle,  (int)WindowsMessages.WM_SYSCOMMAND, (IntPtr)User32.SC_RESTORE, IntPtr.Zero);
                }
            }
        }

        /// <summary>
        /// Gets/Sets whether the window is maximised or not.
        /// </summary>
        public bool Maximised {
            get {
                if (IsApp)
                {
                    if (Visible) {
                        Rectangle windowRectangle = WindowRectangle;
                        foreach (var screen in Screen.AllScreens) {
                            if (screen.Bounds.Contains(windowRectangle)) {
                                if (windowRectangle.Equals(screen.Bounds)) {
                                    return true;
                                }
                            }
                        }
                    }
                    return false;
                }
                return User32.IsZoomed(Handle);
            }
            set {
                if (value) {
                    User32.SendMessage(Handle, (int)WindowsMessages.WM_SYSCOMMAND, (IntPtr)User32.SC_MAXIMIZE, IntPtr.Zero);
                } else {
                    User32.SendMessage(Handle, (int)WindowsMessages.WM_SYSCOMMAND, (IntPtr)User32.SC_MINIMIZE, IntPtr.Zero);
                }
            }
        }

        /// <summary>
        /// This doesn't work as good as is should, but does move the App out of the way...
        /// </summary>
        public void HideApp() {
            User32.ShowWindow(Handle, ShowWindowCommand.Hide);
        }

        /// <summary>
        /// Returns if this window is cloaked
        /// </summary>
        public bool IsCloaked
        {
            get => DWM.IsWindowCloaked(Handle);
        }

        /// <summary>
        /// Gets whether the window is visible.
        /// </summary>
        public bool Visible {
            get {
                // Tip from Raymond Chen
                if (IsCloaked)
                {
                    return false;
                }
                if (IsApp) {
                    Rectangle windowRectangle = WindowRectangle;
                    foreach (Screen screen in Screen.AllScreens) {
                        if (screen.Bounds.Contains(windowRectangle)) {
                            if (windowRectangle.Equals(screen.Bounds)) {
                                // Fullscreen, it's "visible" when AppVisibilityOnMonitor says yes
                                // Although it might be the other App, this is not "very" important
                                RECT rect = new RECT(screen.Bounds);
                                IntPtr monitor = User32.MonitorFromRect(ref rect, User32.MONITOR_DEFAULTTONULL);
                                if (monitor != IntPtr.Zero) {
                                    MONITOR_APP_VISIBILITY? monitorAppVisibility = AppVisibility?.GetAppVisibilityOnMonitor(monitor);
                                    //LOG.DebugFormat("App {0} visible: {1} on {2}", Text, monitorAppVisibility, screen.Bounds);
                                    if (monitorAppVisibility == MONITOR_APP_VISIBILITY.MAV_APP_VISIBLE) {
                                        return true;
                                    }
                                }
                            } else {
                                // Is only partly on the screen, when this happens the app is always visible!
                                return true;
                            }
                        }
                    }
                    return false;
                }
                if (IsGutter) {
                    // gutter is only made available when it's visible
                    return true;
                }
                if (IsAppLauncher) {
                    return IsAppLauncherVisible;
                }
                return User32.IsWindowVisible(Handle);
            }
        }

        public bool HasParent {
            get {
                GetParent();
                return _parentHandle != IntPtr.Zero;
            }
        }

        public int ProcessId {
            get {
                User32.GetWindowThreadProcessId(Handle, out var processId);
                return processId;
            }
        }

        public Process Process {
            get {
                try {
                    User32.GetWindowThreadProcessId(Handle, out var processId);
                    return Process.GetProcessById(processId);
                } catch (Exception ex) {
                    Log.Warn(ex);
                }
                return null;
            }
        }

        /// <summary>
        /// Make sure the next call of a cached value is guaranteed the real value
        /// </summary>
        public void Reset() {
            _previousWindowRectangle = Rectangle.Empty;
        }

        private Rectangle _previousWindowRectangle = Rectangle.Empty;
        private long _lastWindowRectangleRetrieveTime;
        private const long CacheTime = TimeSpan.TicksPerSecond * 2;

        /// <summary>
        /// Gets the bounding rectangle of the window
        /// </summary>
        public Rectangle WindowRectangle {
            get {
                // Try to return a cached value
                long now = DateTime.Now.Ticks;
                if (_previousWindowRectangle.IsEmpty || !_frozen) {
                    if (!_previousWindowRectangle.IsEmpty && now - _lastWindowRectangleRetrieveTime <= CacheTime)
                    {
                        return _previousWindowRectangle;
                    }
                    Rectangle windowRect = Rectangle.Empty;
                    if (DWM.IsDwmEnabled)
                    {
                        bool gotFrameBounds = GetExtendedFrameBounds(out windowRect);
                        if (IsApp)
                        {
                            // Pre-Cache for maximized call, this is only on Windows 8 apps (full screen)
                            if (gotFrameBounds)
                            {
                                _previousWindowRectangle = windowRect;
                                _lastWindowRectangleRetrieveTime = now;
                            }
                        }
                        if (gotFrameBounds && WindowsVersion.IsWindows10OrLater && !Maximised)
                        {
                            // Somehow DWM doesn't calculate it corectly, there is a 1 pixel border around the capture
                            // Remove this border, currently it's fixed but TODO: Make it depend on the OS?
                            windowRect.Inflate(Conf.Win10BorderCrop);
                            _previousWindowRectangle = windowRect;
                            _lastWindowRectangleRetrieveTime = now;
                            return windowRect;
                        }
                    }

                    if (windowRect.IsEmpty) {
                        if (!GetWindowRect(out windowRect))
                        {
                            Win32Error error = Win32.GetLastErrorCode();
                            Log.WarnFormat("Couldn't retrieve the windows rectangle: {0}", Win32.GetMessage(error));
                        }
                    }

                    // Correction for maximized windows, only if it's not an app
                    if (!HasParent && !IsApp && Maximised) {
                        // Only if the border size can be retrieved
                        if (GetBorderSize(out var size))
                        {
                            windowRect = new Rectangle(windowRect.X + size.Width, windowRect.Y + size.Height, windowRect.Width - (2 * size.Width), windowRect.Height - (2 * size.Height));
                        }
                    }
                    _lastWindowRectangleRetrieveTime = now;
                    // Try to return something valid, by getting returning the previous size if the window doesn't have a Rectangle anymore
                    if (windowRect.IsEmpty) {
                        return _previousWindowRectangle;
                    }
                    _previousWindowRectangle = windowRect;
                    return windowRect;
                }
                return _previousWindowRectangle;
            }
        }

        /// <summary>
        /// Gets the location of the window relative to the screen.
        /// </summary>
        public Point Location {
            get {
                Rectangle tmpRectangle = WindowRectangle;
                return new Point(tmpRectangle.Left, tmpRectangle.Top);
            }
        }

        /// <summary>
        /// Gets the size of the window.
        /// </summary>
        public Size Size {
            get {
                Rectangle tmpRectangle = WindowRectangle;
                return new Size(tmpRectangle.Right - tmpRectangle.Left, tmpRectangle.Bottom - tmpRectangle.Top);
            }
        }

        /// <summary>
        /// Get the client rectangle, this is the part of the window inside the borders (drawable area)
        /// </summary>
        public Rectangle ClientRectangle {
            get {
                if (!GetClientRect(out var clientRect))
                {
                    Win32Error error = Win32.GetLastErrorCode();
                    Log.WarnFormat("Couldn't retrieve the client rectangle for {0}, error: {1}", Text, Win32.GetMessage(error));
                }
                return clientRect;
            }
        }

        /// <summary>
        /// Check if the supplied point lies in the window
        /// </summary>
        /// <param name="p">Point with the coordinates to check</param>
        /// <returns>true if the point lies within</returns>
        public bool Contains(Point p) {
            return WindowRectangle.Contains(p);
        }

        /// <summary>
        /// Restores and Brings the window to the front,
        /// assuming it is a visible application window.
        /// </summary>
        public void Restore() {
            if (Iconic) {
                User32.SendMessage(Handle, (int)WindowsMessages.WM_SYSCOMMAND, (IntPtr)User32.SC_RESTORE, IntPtr.Zero);
            }
            User32.BringWindowToTop(Handle);
            User32.SetForegroundWindow(Handle);
            // Make sure windows has time to perform the action
            // TODO: this is BAD practice!
            while(Iconic) {
                Application.DoEvents();
            }
        }

        /// <summary>
        /// Get / Set the WindowStyle
        /// </summary>
        public WindowStyleFlags WindowStyle {
            get => (WindowStyleFlags)User32.GetWindowLongWrapper(Handle, (int)WindowLongIndex.GWL_STYLE);
            set => User32.SetWindowLongWrapper(Handle, (int)WindowLongIndex.GWL_STYLE, new IntPtr((long)value));
        }

        /// <summary>
        /// Get/Set the WindowPlacement
        /// </summary>
        public WindowPlacement WindowPlacement {
            get {
                var placement = WindowPlacement.Default;
                User32.GetWindowPlacement(Handle, ref placement);
                return placement;
            }
            set {
                User32.SetWindowPlacement(Handle, ref value);
            }
        }

        /// <summary>
        /// Get/Set the Extended WindowStyle
        /// </summary>
        public ExtendedWindowStyleFlags ExtendedWindowStyle {
            get => (ExtendedWindowStyleFlags)User32.GetWindowLongWrapper(Handle, (int)WindowLongIndex.GWL_EXSTYLE);
            set => User32.SetWindowLongWrapper(Handle, (int)WindowLongIndex.GWL_EXSTYLE, new IntPtr((uint)value));
        }

        /// <summary>
        /// Capture Window with GDI+
        /// </summary>
        /// <param name="capture">The capture to fill</param>
        /// <returns>ICapture</returns>
        public ICapture CaptureGdiWindow(ICapture capture) {
            Image capturedImage = PrintWindow();
            if (capturedImage != null) {
                capture.Image = capturedImage;
                capture.Location = Location;
                return capture;
            }
            return null;
        }

        /// <summary>
        /// Capture DWM Window
        /// </summary>
        /// <param name="capture">Capture to fill</param>
        /// <param name="windowCaptureMode">Wanted WindowCaptureMode</param>
        /// <param name="autoMode">True if auto mode is used</param>
        /// <returns>ICapture with the capture</returns>
        public ICapture CaptureDwmWindow(ICapture capture, WindowCaptureMode windowCaptureMode, bool autoMode) {
            IntPtr thumbnailHandle = IntPtr.Zero;
            Form tempForm = null;
            bool tempFormShown = false;
            try {
                tempForm = new Form
                {
                    ShowInTaskbar = false,
                    FormBorderStyle = FormBorderStyle.None,
                    TopMost = true
                };

                // Register the Thumbnail
                DWM.DwmRegisterThumbnail(tempForm.Handle, Handle, out thumbnailHandle);

                // Get the original size
                DWM.DwmQueryThumbnailSourceSize(thumbnailHandle, out var sourceSize);

                if (sourceSize.Width <= 0 || sourceSize.Height <= 0) {
                    return null;
                }

                // Calculate the location of the temp form
                Rectangle windowRectangle = WindowRectangle;
                Point formLocation = windowRectangle.Location;
                Size borderSize = new Size();
                bool doesCaptureFit = false;
                if (!Maximised) {
                    // Assume using it's own location
                    formLocation = windowRectangle.Location;
                    // TODO: Use Rectangle.Union!
                    using Region workingArea = new Region(Screen.PrimaryScreen.Bounds);
                    // Find the screen where the window is and check if it fits
                    foreach (Screen screen in Screen.AllScreens) {
                        if (!Equals(screen, Screen.PrimaryScreen)) {
                            workingArea.Union(screen.Bounds);
                        }
                    }

                    // If the formLocation is not inside the visible area
                    if (!workingArea.AreRectangleCornersVisisble(windowRectangle)) {
                        // If none found we find the biggest screen
                        foreach (Screen screen in Screen.AllScreens) {
                            Rectangle newWindowRectangle = new Rectangle(screen.WorkingArea.Location, windowRectangle.Size);
                            if (workingArea.AreRectangleCornersVisisble(newWindowRectangle)) {
                                formLocation = screen.Bounds.Location;
                                doesCaptureFit = true;
                                break;
                            }
                        }
                    } else {
                        doesCaptureFit = true;
                    }
                } else if (!WindowsVersion.IsWindows8OrLater) {
                    //GetClientRect(out windowRectangle);
                    GetBorderSize(out borderSize);
                    formLocation = new Point(windowRectangle.X - borderSize.Width, windowRectangle.Y - borderSize.Height);
                }

                tempForm.Location = formLocation;
                tempForm.Size = sourceSize.ToSize();

                // Prepare rectangle to capture from the screen.
                Rectangle captureRectangle = new Rectangle(formLocation.X, formLocation.Y, sourceSize.Width, sourceSize.Height);
                if (Maximised) {
                    // Correct capture size for maximized window by offsetting the X,Y with the border size
                    // and subtracting the border from the size (2 times, as we move right/down for the capture without resizing)
                    captureRectangle.Inflate(borderSize.Width, borderSize.Height);
                } else {
                    // TODO: Also 8.x?
                    if (WindowsVersion.IsWindows10OrLater)
                    {
                        captureRectangle.Inflate(Conf.Win10BorderCrop);
                    }

                    if (autoMode) {
                        // check if the capture fits
                        if (!doesCaptureFit)
                        {
                            // if GDI is allowed.. (a screenshot won't be better than we comes if we continue)
                            using Process thisWindowProcess = Process;
                            if (!IsMetroApp && WindowCapture.IsGdiAllowed(thisWindowProcess)) {
                                // we return null which causes the capturing code to try another method.
                                return null;
                            }
                        }
                    }
                }
                // Prepare the displaying of the Thumbnail
                DWM_THUMBNAIL_PROPERTIES props = new DWM_THUMBNAIL_PROPERTIES
                {
                    Opacity = 255,
                    Visible = true,
                    Destination = new RECT(0, 0, sourceSize.Width, sourceSize.Height)
                };
                DWM.DwmUpdateThumbnailProperties(thumbnailHandle, ref props);
                tempForm.Show();
                tempFormShown = true;

                // Intersect with screen
                captureRectangle.Intersect(capture.ScreenBounds);

                // Destination bitmap for the capture
                Bitmap capturedBitmap = null;
                bool frozen = false;
                try {
                    // Check if we make a transparent capture
                    if (windowCaptureMode == WindowCaptureMode.AeroTransparent) {
                        frozen = FreezeWindow();
                        // Use white, later black to capture transparent
                        tempForm.BackColor = Color.White;
                        // Make sure everything is visible
                        tempForm.Refresh();
                        Application.DoEvents();

                        try
                        {
                            using Bitmap whiteBitmap = WindowCapture.CaptureRectangle(captureRectangle);
                            // Apply a white color
                            tempForm.BackColor = Color.Black;
                            // Make sure everything is visible
                            tempForm.Refresh();
                            if (!IsMetroApp) {
                                // Make sure the application window is active, so the colors & buttons are right
                                ToForeground();
                            }
                            // Make sure all changes are processed and visible
                            Application.DoEvents();
                            using Bitmap blackBitmap = WindowCapture.CaptureRectangle(captureRectangle);
                            capturedBitmap = ApplyTransparency(blackBitmap, whiteBitmap);
                        } catch (Exception e) {
                            Log.Debug("Exception: ", e);
                            // Some problem occurred, cleanup and make a normal capture
                            if (capturedBitmap != null) {
                                capturedBitmap.Dispose();
                                capturedBitmap = null;
                            }
                        }
                    }
                    // If no capture up till now, create a normal capture.
                    if (capturedBitmap == null) {
                        // Remove transparency, this will break the capturing
                        if (!autoMode) {
                            tempForm.BackColor = Color.FromArgb(255, Conf.DWMBackgroundColor.R, Conf.DWMBackgroundColor.G, Conf.DWMBackgroundColor.B);
                        } else {
                            Color colorizationColor = DWM.ColorizationColor;
                            // Modify by losing the transparency and increasing the intensity (as if the background color is white)
                            colorizationColor = Color.FromArgb(255, (colorizationColor.R + 255) >> 1, (colorizationColor.G + 255) >> 1, (colorizationColor.B + 255) >> 1);
                            tempForm.BackColor = colorizationColor;
                        }
                        // Make sure everything is visible
                        tempForm.Refresh();
                        if (!IsMetroApp) {
                            // Make sure the application window is active, so the colors & buttons are right
                            ToForeground();
                        }
                        // Make sure all changes are processed and visible
                        Application.DoEvents();
                        // Capture from the screen
                        capturedBitmap = WindowCapture.CaptureRectangle(captureRectangle);
                    }
                    if (capturedBitmap != null) {
                        // Not needed for Windows 8
                        if (!WindowsVersion.IsWindows8OrLater) {
                            // Only if the Inivalue is set, not maximized and it's not a tool window.
                            if (Conf.WindowCaptureRemoveCorners && !Maximised && (ExtendedWindowStyle & ExtendedWindowStyleFlags.WS_EX_TOOLWINDOW) == 0) {
                                // Remove corners
                                if (!Image.IsAlphaPixelFormat(capturedBitmap.PixelFormat)) {
                                    Log.Debug("Changing pixelformat to Alpha for the RemoveCorners");
                                    Bitmap tmpBitmap = ImageHelper.Clone(capturedBitmap, PixelFormat.Format32bppArgb);
                                    capturedBitmap.Dispose();
                                    capturedBitmap = tmpBitmap;
                                }
                                RemoveCorners(capturedBitmap);
                            }
                        }
                    }
                } finally {
                    // Make sure to ALWAYS unfreeze!!
                    if (frozen) {
                        UnfreezeWindow();
                    }
                }

                capture.Image = capturedBitmap;
                // Make sure the capture location is the location of the window, not the copy
                capture.Location = Location;
            } finally {
                if (thumbnailHandle != IntPtr.Zero) {
                    // Unregister (cleanup), as we are finished we don't need the form or the thumbnail anymore
                    DWM.DwmUnregisterThumbnail(thumbnailHandle);
                }
                if (tempForm != null) {
                    if (tempFormShown) {
                        tempForm.Close();
                    }
                    tempForm.Dispose();
                    tempForm = null;
                }
            }

            return capture;
        }

        /// <summary>
        /// Helper method to remove the corners from a DMW capture
        /// </summary>
        /// <param name="image">The bitmap to remove the corners from.</param>
        private void RemoveCorners(Bitmap image)
        {
            using IFastBitmap fastBitmap = FastBitmap.Create(image);
            for (int y = 0; y < Conf.WindowCornerCutShape.Count; y++) {
                for (int x = 0; x < Conf.WindowCornerCutShape[y]; x++) {
                    fastBitmap.SetColorAt(x, y, Color.Transparent);
                    fastBitmap.SetColorAt(image.Width-1-x, y, Color.Transparent);
                    fastBitmap.SetColorAt(image.Width-1-x, image.Height-1-y, Color.Transparent);
                    fastBitmap.SetColorAt(x, image.Height-1-y, Color.Transparent);
                }
            }
        }

        /// <summary>
        /// Apply transparency by comparing a transparent capture with a black and white background
        /// A "Math.min" makes sure there is no overflow, but this could cause the picture to have shifted colors.
        /// The pictures should have been taken without differency, except for the colors.
        /// </summary>
        /// <param name="blackBitmap">Bitmap with the black image</param>
        /// <param name="whiteBitmap">Bitmap with the black image</param>
        /// <returns>Bitmap with transparency</returns>
        private Bitmap ApplyTransparency(Bitmap blackBitmap, Bitmap whiteBitmap)
        {
            using IFastBitmap targetBuffer = FastBitmap.CreateEmpty(blackBitmap.Size, PixelFormat.Format32bppArgb, Color.Transparent);
            targetBuffer.SetResolution(blackBitmap.HorizontalResolution, blackBitmap.VerticalResolution);
            using (IFastBitmap blackBuffer = FastBitmap.Create(blackBitmap))
            {
                using IFastBitmap whiteBuffer = FastBitmap.Create(whiteBitmap);
                for (int y = 0; y < blackBuffer.Height; y++) {
                    for (int x = 0; x < blackBuffer.Width; x++) {
                        Color c0 = blackBuffer.GetColorAt(x, y);
                        Color c1 = whiteBuffer.GetColorAt(x, y);
                        // Calculate alpha as double in range 0-1
                        int alpha = c0.R - c1.R + 255;
                        if (alpha == 255) {
                            // Alpha == 255 means no change!
                            targetBuffer.SetColorAt(x, y, c0);
                        } else if (alpha == 0) {
                            // Complete transparency, use transparent pixel
                            targetBuffer.SetColorAt(x, y, Color.Transparent);
                        } else {
                            // Calculate original color
                            byte originalAlpha = (byte)Math.Min(255, alpha);
                            var alphaFactor = alpha/255d;
                            //LOG.DebugFormat("Alpha {0} & c0 {1} & c1 {2}", alpha, c0, c1);
                            byte originalRed = (byte)Math.Min(255, c0.R / alphaFactor);
                            byte originalGreen = (byte)Math.Min(255, c0.G / alphaFactor);
                            byte originalBlue = (byte)Math.Min(255, c0.B / alphaFactor);
                            Color originalColor = Color.FromArgb(originalAlpha, originalRed, originalGreen, originalBlue);
                            //Color originalColor = Color.FromArgb(originalAlpha, originalRed, c0.G, c0.B);
                            targetBuffer.SetColorAt(x, y, originalColor);
                        }
                    }
                }
            }
            return targetBuffer.UnlockAndReturnBitmap();
        }

        /// <summary>
        /// Helper method to get the window size for DWM Windows
        /// </summary>
        /// <param name="rectangle">out Rectangle</param>
        /// <returns>bool true if it worked</returns>
        private bool GetExtendedFrameBounds(out Rectangle rectangle) {
            int result = DWM.DwmGetWindowAttribute(Handle, DWMWINDOWATTRIBUTE.DWMWA_EXTENDED_FRAME_BOUNDS, out RECT rect, Marshal.SizeOf(typeof(RECT)));
            if (result >= 0) {
                rectangle = rect.ToRectangle();
                return true;
            }
            rectangle = Rectangle.Empty;
            return false;
        }

        /// <summary>
        /// Helper method to get the window size for GDI Windows
        /// </summary>
        /// <param name="rectangle">out Rectangle</param>
        /// <returns>bool true if it worked</returns>
        private bool GetClientRect(out Rectangle rectangle) {
            var windowInfo = new WindowInfo();
            // Get the Window Info for this window
            bool result = User32.GetWindowInfo(Handle, ref windowInfo);
            rectangle = result ? windowInfo.rcClient.ToRectangle() : Rectangle.Empty;
            return result;
        }

        /// <summary>
        /// Helper method to get the window size for GDI Windows
        /// </summary>
        /// <param name="rectangle">out Rectangle</param>
        /// <returns>bool true if it worked</returns>
        private bool GetWindowRect(out Rectangle rectangle) {
            var windowInfo = new WindowInfo();
            // Get the Window Info for this window
            bool result = User32.GetWindowInfo(Handle, ref windowInfo);
            rectangle = result ? windowInfo.rcWindow.ToRectangle() : Rectangle.Empty;
            return result;
        }

        /// <summary>
        /// Helper method to get the Border size for GDI Windows
        /// </summary>
        /// <param name="size">out Size</param>
        /// <returns>bool true if it worked</returns>
        private bool GetBorderSize(out Size size) {
            var windowInfo = new WindowInfo();
            // Get the Window Info for this window
            bool result = User32.GetWindowInfo(Handle, ref windowInfo);
            size = result ? new Size((int)windowInfo.cxWindowBorders, (int)windowInfo.cyWindowBorders) : Size.Empty;
            return result;
        }

        /// <summary>
        /// Set the window as foreground window
        /// </summary>
        /// <param name="hWnd">hWnd of the window to bring to the foreground</param>
        public static void ToForeground(IntPtr hWnd)
        {
            var foregroundWindow = User32.GetForegroundWindow();
            if (hWnd == foregroundWindow)
            {
                return;
            }

            var window = new WindowDetails(hWnd);
            // Nothing we can do if it's not visible!
            if (!window.Visible)
            {
                return;
            }

            var threadId1 = User32.GetWindowThreadProcessId(foregroundWindow, IntPtr.Zero);
            var threadId2 = User32.GetWindowThreadProcessId(hWnd, IntPtr.Zero);

            // Show window in foreground.
            if (threadId1 != threadId2)
            {
                User32.AttachThreadInput(threadId1, threadId2, 1);
                User32.SetForegroundWindow(hWnd);
                User32.AttachThreadInput(threadId1, threadId2, 0);
            }
            else
            {
                User32.SetForegroundWindow(hWnd);
            }

            User32.BringWindowToTop(hWnd);

            if (window.Iconic)
            {
                window.Iconic = false;
            }
        }

        /// <summary>
        /// Set the window as foreground window
        /// </summary>
        public void ToForeground() {
            ToForeground(Handle);
        }

        /// <summary>
        /// Get the region for a window
        /// </summary>
        private Region GetRegion() {
            using (SafeRegionHandle region = GDI32.CreateRectRgn(0, 0, 0, 0)) {
                if (!region.IsInvalid) {
                    RegionResult result = User32.GetWindowRgn(Handle, region);
                    if (result != RegionResult.REGION_ERROR && result != RegionResult.REGION_NULLREGION) {
                        return Region.FromHrgn(region.DangerousGetHandle());
                    }
                }
            }
            return null;
        }

        private bool CanFreezeOrUnfreeze(string titleOrProcessname) {
            if (string.IsNullOrEmpty(titleOrProcessname)) {
                return false;
            }
            if (titleOrProcessname.ToLower().Contains("greenshot")) {
                return false;
            }

            foreach (string excludeProcess in ExcludeProcessesFromFreeze) {
                if (titleOrProcessname.ToLower().Contains(excludeProcess)) {
                    return false;
                }
            }
            return true;
        }

        /// <summary>
        /// Freezes the process belonging to the window
        /// Warning: Use only if no other way!!
        /// </summary>
        private bool FreezeWindow() {
            bool frozen = false;
            using (Process proc = Process.GetProcessById(ProcessId)) {
                string processName = proc.ProcessName;
                if (!CanFreezeOrUnfreeze(processName)) {
                    Log.DebugFormat("Not freezing {0}", processName);
                    return false;
                }
                if (!CanFreezeOrUnfreeze(Text)) {
                    Log.DebugFormat("Not freezing {0}", processName);
                    return false;
                }
                Log.DebugFormat("Freezing process: {0}", processName);


                foreach (ProcessThread pT in proc.Threads) {
                    IntPtr pOpenThread = Kernel32.OpenThread(ThreadAccess.SUSPEND_RESUME, false, (uint)pT.Id);

                    if (pOpenThread == IntPtr.Zero) {
                        break;
                    }
                    frozen = true;
                    Kernel32.SuspendThread(pOpenThread);
                    pT.Dispose();
                }
            }
            return frozen;
        }

        /// <summary>
        /// Unfreeze the process belonging to the window
        /// </summary>
        public void UnfreezeWindow()
        {
            using Process proc = Process.GetProcessById(ProcessId);
            string processName = proc.ProcessName;
            if (!CanFreezeOrUnfreeze(processName)) {
                Log.DebugFormat("Not unfreezing {0}", processName);
                return;
            }
            if (!CanFreezeOrUnfreeze(Text)) {
                Log.DebugFormat("Not unfreezing {0}", processName);
                return;
            }
            Log.DebugFormat("Unfreezing process: {0}", processName);

            foreach (ProcessThread pT in proc.Threads) {
                IntPtr pOpenThread = Kernel32.OpenThread(ThreadAccess.SUSPEND_RESUME, false, (uint)pT.Id);

                if (pOpenThread == IntPtr.Zero) {
                    break;
                }

                Kernel32.ResumeThread(pOpenThread);
            }
        }

        /// <summary>
        /// Return an Image representing the Window!
        /// As GDI+ draws it, it will be without Aero borders!
        /// </summary>
        public Image PrintWindow() {
            Rectangle windowRect = WindowRectangle;
            // Start the capture
            Exception exceptionOccured = null;
            Image returnImage;
            using (Region region = GetRegion()) {
                PixelFormat pixelFormat = PixelFormat.Format24bppRgb;
                // Only use 32 bpp ARGB when the window has a region
                if (region != null) {
                    pixelFormat = PixelFormat.Format32bppArgb;
                }
                returnImage = new Bitmap(windowRect.Width, windowRect.Height, pixelFormat);
                using Graphics graphics = Graphics.FromImage(returnImage);
                using (SafeDeviceContextHandle graphicsDc = graphics.GetSafeDeviceContext()) {
                    bool printSucceeded = User32.PrintWindow(Handle, graphicsDc.DangerousGetHandle(), 0x0);
                    if (!printSucceeded) {
                        // something went wrong, most likely a "0x80004005" (Acess Denied) when using UAC
                        exceptionOccured = User32.CreateWin32Exception("PrintWindow");
                    }
                }

                // Apply the region "transparency"
                if (region != null && !region.IsEmpty(graphics)) {
                    graphics.ExcludeClip(region);
                    graphics.Clear(Color.Transparent);
                }

                graphics.Flush();
            }

            // Return null if error
            if (exceptionOccured != null) {
                Log.ErrorFormat("Error calling print window: {0}", exceptionOccured.Message);
                returnImage.Dispose();
                return null;
            }
            if (!HasParent && Maximised) {
                Log.Debug("Correcting for maximalization");
                GetBorderSize(out var borderSize);
                Rectangle borderRectangle = new Rectangle(borderSize.Width, borderSize.Height, windowRect.Width - (2 * borderSize.Width), windowRect.Height - (2 * borderSize.Height));
                ImageHelper.Crop(ref returnImage, ref borderRectangle);
            }
            return returnImage;
        }

        /// <summary>
        ///  Constructs a new instance of this class for
        ///  the specified Window Handle.
        /// </summary>
        /// <param name="hWnd">The Window Handle</param>
        public WindowDetails(IntPtr hWnd) {
            Handle = hWnd;
        }

        /// <summary>
        /// Gets an instance of the current active foreground window
        /// </summary>
        /// <returns>WindowDetails of the current window</returns>
        public static WindowDetails GetActiveWindow() {
            IntPtr hWnd = User32.GetForegroundWindow();
            if (hWnd != IntPtr.Zero) {
                if (IgnoreHandles.Contains(hWnd)) {
                    return GetDesktopWindow();
                }

                WindowDetails activeWindow = new WindowDetails(hWnd);
                // Invisible Windows should not be active
                if (!activeWindow.Visible) {
                    return GetDesktopWindow();
                }
                return activeWindow;
            }
            return null;
        }

        /// <summary>
        /// Check if this window is Greenshot
        /// </summary>
        public bool IsGreenshot {
            get {
                try {
                    if (!IsMetroApp)
                    {
                        using Process thisWindowProcess = Process;
                        return "Greenshot".Equals(thisWindowProcess.MainModule.FileVersionInfo.ProductName);
                    }
                } catch (Exception ex) {
                    Log.Warn(ex);
                }
                return false;
            }
        }

        /// <summary>
        /// Gets the Desktop window
        /// </summary>
        /// <returns>WindowDetails for the desktop window</returns>
        public static WindowDetails GetDesktopWindow() {
            return new WindowDetails(User32.GetDesktopWindow());
        }

        /// <summary>
        /// Get all the top level windows
        /// </summary>
        /// <returns>List of WindowDetails with all the top level windows</returns>
        public static IList<WindowDetails> GetAllWindows() {
            return GetAllWindows(null);
        }

        /// <summary>
        /// Get all the top level windows, with matching classname
        /// </summary>
        /// <returns>List WindowDetails with all the top level windows</returns>
        public static IList<WindowDetails> GetAllWindows(string classname) {
            return new WindowsEnumerator().GetWindows(IntPtr.Zero, classname).Items;
        }

        /// <summary>
        /// Recursive "find children which"
        /// </summary>
        /// <param name="point">point to check for</param>
        /// <returns></returns>
        public WindowDetails FindChildUnderPoint(Point point) {
            if (!Contains(point)) {
                return null;
            }
            var rect = WindowRectangle;
            // If the mouse it at the edge, take the whole window
            if (rect.X == point.X || rect.Y == point.Y || rect.Right == point.X || rect.Bottom == point.Y)
            {
                return this;
            }
            // Look into the child windows
            foreach(var childWindow in Children) {
                if (childWindow.Contains(point)) {
                    return childWindow.FindChildUnderPoint(point);
                }
            }
            return this;
        }

        /// <summary>
        /// Retrieves the classname for a hWnd
        /// </summary>
        /// <param name="hWnd">IntPtr with the windows handle</param>
        /// <returns>String with ClassName</returns>
        public static string GetClassName(IntPtr hWnd) {
            var classNameBuilder = new StringBuilder(260, 260);
            User32.GetClassName(hWnd, classNameBuilder, classNameBuilder.Capacity);
            return classNameBuilder.ToString();
        }

        /// <summary>
        /// Helper method to decide if a top level window is visible
        /// </summary>
        /// <param name="window"></param>
        /// <param name="screenBounds"></param>
        /// <returns></returns>
        private static bool IsVisible(WindowDetails window, Rectangle screenBounds)
        {
            // Ignore invisible
            if (!window.Visible)
            {
                return false;
            }
            // Ignore minimized
            if (window.Iconic)
            {
                return false;
            }
            if (IgnoreClasses.Contains(window.ClassName))
            {
                return false;
            }
            // On windows which are visible on the screen
            var windowRect = window.WindowRectangle;
            windowRect.Intersect(screenBounds);
            if (windowRect.IsEmpty)
            {
                return false;
            }
            // Skip everything which is not rendered "normally", trying to fix BUG-2017
            var exWindowStyle = window.ExtendedWindowStyle;
            if (!window.IsApp && !window.IsWin10App && (exWindowStyle & ExtendedWindowStyleFlags.WS_EX_NOREDIRECTIONBITMAP) != 0)
            {
                return false;
            }

            return true;
        }

        /// <summary>
        /// Get all the visible top level windows
        /// </summary>
        /// <returns>List WindowDetails with all the visible top level windows</returns>
        public static IEnumerable<WindowDetails> GetVisibleWindows() {
            Rectangle screenBounds = WindowCapture.GetScreenBounds();
            foreach(var window in GetMetroApps()) {
                if (IsVisible(window, screenBounds))
                {
                    yield return window;
                }
            }
            foreach (var window in GetAllWindows())
            {
                if (IsVisible(window, screenBounds))
                {
                    yield return window;
                }
            }
        }

        /// <summary>
        /// Get the WindowDetails for all Metro Apps
        /// These are all Windows with Classname "Windows.UI.Core.CoreWindow"
        /// </summary>
        /// <returns>List WindowDetails with visible metro apps</returns>
        public static IEnumerable<WindowDetails> GetMetroApps() {
            // if the appVisibility != null we have Windows 8.
            if (AppVisibility == null)
            {
                yield break;
            }
            //string[] wcs = {"ImmersiveGutter", "Snapped Desktop", "ImmersiveBackgroundWindow","ImmersiveLauncher","Windows.UI.Core.CoreWindow","ApplicationManager_ImmersiveShellWindow","SearchPane","MetroGhostWindow","EdgeUiInputWndClass", "NativeHWNDHost", "Shell_CharmWindow"};
            //List<WindowDetails> specials = new List<WindowDetails>();
            //foreach(string wc in wcs) {
            //	IntPtr wcHandle = User32.FindWindow(null, null);
            //	while (wcHandle != IntPtr.Zero) {
            //		WindowDetails special = new WindowDetails(wcHandle);
            //		if (special.WindowRectangle.Left >= 1920 && special.WindowRectangle.Size != Size.Empty) {
            //			specials.Add(special);
            //			LOG.DebugFormat("Found special {0} : {1} at {2} visible: {3} {4} {5}", special.ClassName, special.Text, special.WindowRectangle, special.Visible, special.ExtendedWindowStyle, special.WindowStyle);
            //		}
            //		wcHandle = User32.FindWindowEx(IntPtr.Zero, wcHandle, null, null);
            //	};
            //}
            IntPtr nextHandle = User32.FindWindow(MetroWindowsClass, null);
            while (nextHandle != IntPtr.Zero) {
                var metroApp = new WindowDetails(nextHandle);
                yield return metroApp;
                // Check if we have a gutter!
                if (metroApp.Visible && !metroApp.Maximised) {
                    var gutterHandle = User32.FindWindow(MetroGutterClass, null);
                    if (gutterHandle != IntPtr.Zero) {
                        yield return new WindowDetails(gutterHandle);
                    }
                }
                nextHandle = User32.FindWindowEx(IntPtr.Zero, nextHandle, MetroWindowsClass, null);
            }
        }

        /// <summary>
        /// Check if the window is a top level
        /// </summary>
        /// <param name="window">WindowDetails</param>
        /// <returns>bool</returns>
        private static bool IsTopLevel(WindowDetails window)
        {
            // Window is not on this desktop
            if (window.IsCloaked)
            {
                return false;
            }

            // Ignore windows without title
            if (window.Text.Length == 0)
            {
                return false;
            }
            if (IgnoreClasses.Contains(window.ClassName))
            {
                return false;
            }
            // Windows without size
            if (window.WindowRectangle.Size.Width * window.WindowRectangle.Size.Height == 0)
            {
                return false;
            }
            if (window.HasParent)
            {
                return false;
            }
            var exWindowStyle = window.ExtendedWindowStyle;
            if ((exWindowStyle & ExtendedWindowStyleFlags.WS_EX_TOOLWINDOW) != 0)
            {
                return false;
            }
            // Skip everything which is not rendered "normally", trying to fix BUG-2017
            if (!window.IsApp && !window.IsWin10App && (exWindowStyle & ExtendedWindowStyleFlags.WS_EX_NOREDIRECTIONBITMAP) != 0)
            {
                return false;
            }
            // Skip preview windows, like the one from Firefox
            if ((window.WindowStyle & WindowStyleFlags.WS_VISIBLE) == 0)
            {
                return false;
            }
            return window.Visible || window.Iconic;
        }

        /// <summary>
        /// Get all the top level windows
        /// </summary>
        /// <returns>List WindowDetails with all the top level windows</returns>
        public static IEnumerable<WindowDetails> GetTopLevelWindows() {
            foreach (var possibleTopLevel in GetMetroApps())
            {
                if (IsTopLevel(possibleTopLevel))
                {
                    yield return possibleTopLevel;
                }
            }

            foreach (var possibleTopLevel in GetAllWindows())
            {
                if (IsTopLevel(possibleTopLevel))
                {
                    yield return possibleTopLevel;
                }
            }
        }

        /// <summary>
        /// Find a window belonging to the same process as the supplied window.
        /// </summary>
        /// <param name="windowToLinkTo"></param>
        /// <returns></returns>
        public static WindowDetails GetLinkedWindow(WindowDetails windowToLinkTo) {
            int processIdSelectedWindow = windowToLinkTo.ProcessId;
            foreach(var window in GetAllWindows()) {
                // Ignore windows without title
                if (window.Text.Length == 0) {
                    continue;
                }
                // Ignore invisible
                if (!window.Visible) {
                    continue;
                }
                if (window.Handle == windowToLinkTo.Handle) {
                    continue;
                }
                if (window.Iconic) {
                    continue;
                }

                // Windows without size
                Size windowSize = window.WindowRectangle.Size;
                if (windowSize.Width == 0 ||  windowSize.Height == 0) {
                    continue;
                }

                if (window.ProcessId == processIdSelectedWindow) {
                    Log.InfoFormat("Found window {0} belonging to same process as the window {1}", window.Text, windowToLinkTo.Text);
                    return window;
                }
            }
            return null;
        }

        /// <summary>
        /// Helper method to "active" all windows that are not in the supplied list.
        /// One should preferably call "GetVisibleWindows" for the oldWindows.
        /// </summary>
        /// <param name="oldWindows">List WindowDetails with old windows</param>
        public static void ActiveNewerWindows(IEnumerable<WindowDetails> oldWindows)
        {
            var oldWindowsList = new List<WindowDetails>(oldWindows);
            foreach(var window in GetVisibleWindows()) {
                if (!oldWindowsList.Contains(window)) {
                    window.ToForeground();
                }
            }
        }

        /// <summary>
        /// Get the AppLauncher
        /// </summary>
        /// <returns></returns>
        public static WindowDetails GetAppLauncher() {
            // Only if Windows 8 (or higher)
            if (AppVisibility == null) {
                return null;
            }
            IntPtr appLauncher = User32.FindWindow(MetroApplauncherClass, null);
            if (appLauncher != IntPtr.Zero) {
                return new WindowDetails (appLauncher);
            }
            return null;
        }

        /// <summary>
        /// Return true if the metro-app-launcher is visible
        /// </summary>
        /// <returns></returns>
        public static bool IsAppLauncherVisible {
            get {
                if (AppVisibility != null) {
                    return AppVisibility.IsLauncherVisible;
                }
                return false;
            }
        }
    }
}