protected override void StartDrag()
        {
            DockWindow window = Parent as DockWindow;

            if (window == null)
            {
                return;
            }

            window.DockPanel.DragHandler.BeginDragDockWindowSplitter(window, this.Location);
        }
        private Rectangle GetWindowSplitterDragRectangle()
        {
            DockState state;
            DockPanel dockPanel;

            DockWindow     dockWindow     = DragControl as DockWindow;
            AutoHideWindow autoHideWindow = DragControl as AutoHideWindow;

            if (dockWindow != null)
            {
                state     = dockWindow.DockState;
                dockPanel = dockWindow.DockPanel;
            }
            else if (autoHideWindow != null)
            {
                state     = autoHideWindow.DockState;
                dockPanel = autoHideWindow.DockPanel;
            }
            else
            {
                return(Rectangle.Empty);
            }

            Rectangle rectLimit = dockPanel.DockArea;
            bool      bVerticalSplitter;

            if (state == DockState.DockLeft || state == DockState.DockRight || state == DockState.DockLeftAutoHide || state == DockState.DockRightAutoHide)
            {
                rectLimit.X      += MeasurePane.MinSize;
                rectLimit.Width  -= 2 * MeasurePane.MinSize;
                rectLimit.Y       = DragControl.Location.Y;
                rectLimit.Height  = DragControl.Height;
                bVerticalSplitter = true;
            }
            else
            {
                rectLimit.Y      += MeasurePane.MinSize;
                rectLimit.Height -= 2 * MeasurePane.MinSize;
                rectLimit.X       = DragControl.Location.X;
                rectLimit.Width   = DragControl.Width;
                bVerticalSplitter = false;
            }

            rectLimit.Location = dockPanel.PointToScreen(rectLimit.Location);

            return(GetSplitterDragRectangle(rectLimit, bVerticalSplitter));
        }
        private void DockWindowSplitter_OnEndDrag(bool abort)
        {
            if (abort)
            {
                return;
            }

            DockWindow dockWindow = DragControl as DockWindow;

            if (dockWindow == null)
            {
                return;
            }
            DockPanel dockPanel = dockWindow.DockPanel;
            DockState state     = dockWindow.DockState;

            Point     pt           = m_splitterLocation;
            Rectangle rect         = GetWindowSplitterDragRectangle();
            Rectangle rectDockArea = dockPanel.DockArea;

            if (state == DockState.DockLeft && rectDockArea.Width > 0)
            {
                dockPanel.DockLeftPortion += ((double)rect.X - (double)pt.X) / (double)rectDockArea.Width;
            }
            else if (state == DockState.DockRight && rectDockArea.Width > 0)
            {
                dockPanel.DockRightPortion += ((double)pt.X - (double)rect.X) / (double)rectDockArea.Width;
            }
            else if (state == DockState.DockBottom && rectDockArea.Height > 0)
            {
                dockPanel.DockBottomPortion += ((double)pt.Y - (double)rect.Y) / (double)rectDockArea.Height;
            }
            else if (state == DockState.DockTop && rectDockArea.Height > 0)
            {
                dockPanel.DockTopPortion += ((double)rect.Y - (double)pt.Y) / (double)rectDockArea.Height;
            }
        }
        public static void LoadFromXml(DockPanel dockPanel, Stream stream, DeserializeDockContent deserializeContent)
        {
            if (dockPanel.Contents.Count != 0)
            {
                throw new InvalidOperationException(ResourceHelper.GetString("DockPanel.LoadFromXml.AlreadyInitialized"));
            }

            EnumConverter      dockStateConverter     = new EnumConverter(typeof(DockState));
            EnumConverter      dockAlignmentConverter = new EnumConverter(typeof(DockAlignment));
            RectangleConverter rectConverter          = new RectangleConverter();

            XmlTextReader xmlIn = new XmlTextReader(stream);

            xmlIn.WhitespaceHandling = WhitespaceHandling.None;
            xmlIn.MoveToContent();

            if (xmlIn.Name != "DockPanel")
            {
                throw new ArgumentException(ResourceHelper.GetString("DockPanel.LoadFromXml.InvalidXmlFormat"));
            }

            string formatVersion = xmlIn.GetAttribute("FormatVersion");

            if (formatVersion != ConfigFileVersion)
            {
                throw new ArgumentException(ResourceHelper.GetString("DockPanel.LoadFromXml.InvalidFormatVersion"));
            }
            DockPanelStruct dockPanelStruct = new DockPanelStruct();

            dockPanelStruct.DockLeftPortion         = Convert.ToDouble(xmlIn.GetAttribute("DockLeftPortion"), CultureInfo.InvariantCulture);
            dockPanelStruct.DockRightPortion        = Convert.ToDouble(xmlIn.GetAttribute("DockRightPortion"), CultureInfo.InvariantCulture);
            dockPanelStruct.DockTopPortion          = Convert.ToDouble(xmlIn.GetAttribute("DockTopPortion"), CultureInfo.InvariantCulture);
            dockPanelStruct.DockBottomPortion       = Convert.ToDouble(xmlIn.GetAttribute("DockBottomPortion"), CultureInfo.InvariantCulture);
            dockPanelStruct.IndexActiveDocumentPane = Convert.ToInt32(xmlIn.GetAttribute("ActiveDocumentPane"));
            dockPanelStruct.IndexActivePane         = Convert.ToInt32(xmlIn.GetAttribute("ActivePane"));

            // Load Contents
            MoveToNextElement(xmlIn);
            if (xmlIn.Name != "Contents")
            {
                throw new ArgumentException(ResourceHelper.GetString("DockPanel.LoadFromXml.InvalidXmlFormat"));
            }
            int countOfContents = Convert.ToInt32(xmlIn.GetAttribute("Count"));

            ContentStruct[] contents = new ContentStruct[countOfContents];
            MoveToNextElement(xmlIn);
            for (int i = 0; i < countOfContents; i++)
            {
                int id = Convert.ToInt32(xmlIn.GetAttribute("ID"));
                if (xmlIn.Name != "Content" || id != i)
                {
                    throw new ArgumentException(ResourceHelper.GetString("DockPanel.LoadFromXml.InvalidXmlFormat"));
                }

                contents[i].PersistString   = xmlIn.GetAttribute("PersistString");
                contents[i].AutoHidePortion = Convert.ToDouble(xmlIn.GetAttribute("AutoHidePortion"), CultureInfo.InvariantCulture);
                contents[i].IsHidden        = Convert.ToBoolean(xmlIn.GetAttribute("IsHidden"));
                contents[i].IsFloat         = Convert.ToBoolean(xmlIn.GetAttribute("IsFloat"));
                MoveToNextElement(xmlIn);
            }

            // Load Panes
            if (xmlIn.Name != "Panes")
            {
                throw new ArgumentException(ResourceHelper.GetString("DockPanel.LoadFromXml.InvalidXmlFormat"));
            }
            int countOfPanes = Convert.ToInt32(xmlIn.GetAttribute("Count"));

            PaneStruct[] panes = new PaneStruct[countOfPanes];
            MoveToNextElement(xmlIn);
            for (int i = 0; i < countOfPanes; i++)
            {
                int id = Convert.ToInt32(xmlIn.GetAttribute("ID"));
                if (xmlIn.Name != "Pane" || id != i)
                {
                    throw new ArgumentException(ResourceHelper.GetString("DockPanel.LoadFromXml.InvalidXmlFormat"));
                }

                panes[i].DockState          = (DockState)dockStateConverter.ConvertFrom(xmlIn.GetAttribute("DockState"));
                panes[i].IndexActiveContent = Convert.ToInt32(xmlIn.GetAttribute("ActiveContent"));
                panes[i].ZOrderIndex        = -1;

                MoveToNextElement(xmlIn);
                if (xmlIn.Name != "Contents")
                {
                    throw new ArgumentException(ResourceHelper.GetString("DockPanel.LoadFromXml.InvalidXmlFormat"));
                }
                int countOfPaneContents = Convert.ToInt32(xmlIn.GetAttribute("Count"));
                panes[i].IndexContents = new int[countOfPaneContents];
                MoveToNextElement(xmlIn);
                for (int j = 0; j < countOfPaneContents; j++)
                {
                    int id2 = Convert.ToInt32(xmlIn.GetAttribute("ID"));
                    if (xmlIn.Name != "Content" || id2 != j)
                    {
                        throw new ArgumentException(ResourceHelper.GetString("DockPanel.LoadFromXml.InvalidXmlFormat"));
                    }

                    panes[i].IndexContents[j] = Convert.ToInt32(xmlIn.GetAttribute("RefID"));
                    MoveToNextElement(xmlIn);
                }
            }

            // Load DockWindows
            if (xmlIn.Name != "DockWindows")
            {
                throw new ArgumentException(ResourceHelper.GetString("DockPanel.LoadFromXml.InvalidXmlFormat"));
            }
            int countOfDockWindows = Convert.ToInt32(xmlIn.GetAttribute("Count"));

            DockWindowStruct[] dockWindows = new DockWindowStruct[countOfDockWindows];
            MoveToNextElement(xmlIn);
            for (int i = 0; i < countOfDockWindows; i++)
            {
                try
                {
                    int id = Convert.ToInt32(xmlIn.GetAttribute("ID"));
                    if (xmlIn.Name != "DockWindow" || id != i)
                    {
                        throw new ArgumentException(ResourceHelper.GetString("DockPanel.LoadFromXml.InvalidXmlFormat"));
                    }

                    dockWindows[i].DockState   = (DockState)dockStateConverter.ConvertFrom(xmlIn.GetAttribute("DockState"));
                    dockWindows[i].ZOrderIndex = Convert.ToInt32(xmlIn.GetAttribute("ZOrderIndex"));
                    MoveToNextElement(xmlIn);
                    if (xmlIn.Name != "DockList")
                    {
                        throw new ArgumentException(ResourceHelper.GetString("DockPanel.LoadFromXml.InvalidXmlFormat"));
                    }
                    int countOfDockList = Convert.ToInt32(xmlIn.GetAttribute("Count"));
                    dockWindows[i].DockList = new DockListItem[countOfDockList];
                    MoveToNextElement(xmlIn);
                    for (int j = 0; j < countOfDockList; j++)
                    {
                        try
                        {
                            int id2 = Convert.ToInt32(xmlIn.GetAttribute("ID"));
                            if (xmlIn.Name != "Pane" || id2 != j)
                            {
                                throw new ArgumentException(ResourceHelper.GetString("DockPanel.LoadFromXml.InvalidXmlFormat"));
                            }
                            dockWindows[i].DockList[j].IndexPane     = Convert.ToInt32(xmlIn.GetAttribute("RefID"));
                            dockWindows[i].DockList[j].IndexPrevPane = Convert.ToInt32(xmlIn.GetAttribute("PrevPane"));
                            dockWindows[i].DockList[j].Alignment     = (DockAlignment)dockAlignmentConverter.ConvertFrom(xmlIn.GetAttribute("Alignment"));
                            dockWindows[i].DockList[j].Proportion    = Convert.ToDouble(xmlIn.GetAttribute("Proportion"), CultureInfo.InvariantCulture);
                            MoveToNextElement(xmlIn);
                        }
                        catch { continue; }
                    }
                }
                catch { continue; }
            }

            // Load FloatWindows
            if (xmlIn.Name != "FloatWindows")
            {
                throw new ArgumentException(ResourceHelper.GetString("DockPanel.LoadFromXml.InvalidXmlFormat"));
            }
            int countOfFloatWindows = Convert.ToInt32(xmlIn.GetAttribute("Count"));

            FloatWindowStruct[] floatWindows = new FloatWindowStruct[countOfFloatWindows];
            MoveToNextElement(xmlIn);
            for (int i = 0; i < countOfFloatWindows; i++)
            {
                int id = Convert.ToInt32(xmlIn.GetAttribute("ID"));
                if (xmlIn.Name != "FloatWindow" || id != i)
                {
                    throw new ArgumentException(ResourceHelper.GetString("DockPanel.LoadFromXml.InvalidXmlFormat"));
                }

                floatWindows[i].Bounds         = (Rectangle)rectConverter.ConvertFromInvariantString(xmlIn.GetAttribute("Bounds"));
                floatWindows[i].AllowRedocking = Convert.ToBoolean(xmlIn.GetAttribute("AllowRedocking"));
                floatWindows[i].ZOrderIndex    = Convert.ToInt32(xmlIn.GetAttribute("ZOrderIndex"));
                MoveToNextElement(xmlIn);
                if (xmlIn.Name != "DockList")
                {
                    throw new ArgumentException(ResourceHelper.GetString("DockPanel.LoadFromXml.InvalidXmlFormat"));
                }
                int countOfDockList = Convert.ToInt32(xmlIn.GetAttribute("Count"));
                floatWindows[i].DockList = new DockListItem[countOfDockList];
                MoveToNextElement(xmlIn);
                for (int j = 0; j < countOfDockList; j++)
                {
                    int id2 = Convert.ToInt32(xmlIn.GetAttribute("ID"));
                    if (xmlIn.Name != "Pane" || id2 != j)
                    {
                        throw new ArgumentException(ResourceHelper.GetString("DockPanel.LoadFromXml.InvalidXmlFormat"));
                    }
                    floatWindows[i].DockList[j].IndexPane     = Convert.ToInt32(xmlIn.GetAttribute("RefID"));
                    floatWindows[i].DockList[j].IndexPrevPane = Convert.ToInt32(xmlIn.GetAttribute("PrevPane"));
                    floatWindows[i].DockList[j].Alignment     = (DockAlignment)dockAlignmentConverter.ConvertFrom(xmlIn.GetAttribute("Alignment"));
                    floatWindows[i].DockList[j].Proportion    = Convert.ToDouble(xmlIn.GetAttribute("Proportion"), CultureInfo.InvariantCulture);
                    MoveToNextElement(xmlIn);
                }
            }
            xmlIn.Close();

            dockPanel.DockLeftPortion   = dockPanelStruct.DockLeftPortion;
            dockPanel.DockRightPortion  = dockPanelStruct.DockRightPortion;
            dockPanel.DockTopPortion    = dockPanelStruct.DockTopPortion;
            dockPanel.DockBottomPortion = dockPanelStruct.DockBottomPortion;

            // Create Contents
            for (int i = 0; i < contents.Length; i++)
            {
                DockContent content = deserializeContent(contents[i].PersistString);
                if (content == null)
                {
                    content = new DummyContent();
                }
                content.DockPanel       = dockPanel;
                content.AutoHidePortion = contents[i].AutoHidePortion;
                content.IsHidden        = true;
                content.IsFloat         = contents[i].IsFloat;
            }

            // Create panes
            for (int i = 0; i < panes.Length; i++)
            {
                DockPane pane = null;
                for (int j = 0; j < panes[i].IndexContents.Length; j++)
                {
                    DockContent content = dockPanel.Contents[panes[i].IndexContents[j]];
                    if (j == 0)
                    {
                        pane = dockPanel.DockPaneFactory.CreateDockPane(content, panes[i].DockState, false);
                    }
                    else if (panes[i].DockState == DockState.Float)
                    {
                        content.FloatPane = pane;
                    }
                    else
                    {
                        content.PanelPane = pane;
                    }
                }
            }

            // Assign Panes to DockWindows
            for (int i = 0; i < dockWindows.Length; i++)
            {
                for (int j = 0; j < dockWindows[i].DockList.Length; j++)
                {
                    DockWindow    dw            = dockPanel.DockWindows[dockWindows[i].DockState];
                    int           indexPane     = dockWindows[i].DockList[j].IndexPane;
                    DockPane      pane          = dockPanel.Panes[indexPane];
                    int           indexPrevPane = dockWindows[i].DockList[j].IndexPrevPane;
                    DockPane      prevPane      = (indexPrevPane == -1) ? dw.DockList.GetDefaultPrevPane(pane) : dockPanel.Panes[indexPrevPane];
                    DockAlignment alignment     = dockWindows[i].DockList[j].Alignment;
                    double        proportion    = dockWindows[i].DockList[j].Proportion;
                    pane.AddToDockList(dw, prevPane, alignment, proportion);
                    if (panes[indexPane].DockState == dw.DockState)
                    {
                        panes[indexPane].ZOrderIndex = dockWindows[i].ZOrderIndex;
                    }
                }
            }

            // Create float windows
            for (int i = 0; i < floatWindows.Length; i++)
            {
                FloatWindow fw = null;
                for (int j = 0; j < floatWindows[i].DockList.Length; j++)
                {
                    int      indexPane = floatWindows[i].DockList[j].IndexPane;
                    DockPane pane      = dockPanel.Panes[indexPane];
                    if (j == 0)
                    {
                        fw = dockPanel.FloatWindowFactory.CreateFloatWindow(dockPanel, pane, floatWindows[i].Bounds);
                    }
                    else
                    {
                        int           indexPrevPane = floatWindows[i].DockList[j].IndexPrevPane;
                        DockPane      prevPane      = indexPrevPane == -1 ? null : dockPanel.Panes[indexPrevPane];
                        DockAlignment alignment     = floatWindows[i].DockList[j].Alignment;
                        double        proportion    = floatWindows[i].DockList[j].Proportion;
                        pane.AddToDockList(fw, prevPane, alignment, proportion);
                        if (panes[indexPane].DockState == fw.DockState)
                        {
                            panes[indexPane].ZOrderIndex = floatWindows[i].ZOrderIndex;
                        }
                    }
                }
            }

            // sort DockContent by its Pane's ZOrder
            int[] sortedContents = null;
            if (contents.Length > 0)
            {
                sortedContents = new int[contents.Length];
                for (int i = 0; i < contents.Length; i++)
                {
                    sortedContents[i] = i;
                }

                int lastDocument = contents.Length;
                for (int i = 0; i < contents.Length - 1; i++)
                {
                    for (int j = i + 1; j < contents.Length; j++)
                    {
                        DockPane pane1        = dockPanel.Contents[sortedContents[i]].Pane;
                        int      ZOrderIndex1 = pane1 == null ? 0 : panes[dockPanel.Panes.IndexOf(pane1)].ZOrderIndex;
                        DockPane pane2        = dockPanel.Contents[sortedContents[j]].Pane;
                        int      ZOrderIndex2 = pane2 == null ? 0 : panes[dockPanel.Panes.IndexOf(pane2)].ZOrderIndex;
                        if (ZOrderIndex1 > ZOrderIndex2)
                        {
                            int temp = sortedContents[i];
                            sortedContents[i] = sortedContents[j];
                            sortedContents[j] = temp;
                        }
                    }
                }
            }

            // show non-document DockContent first to avoid screen flickers
            for (int i = 0; i < contents.Length; i++)
            {
                DockContent content = dockPanel.Contents[sortedContents[i]];
                if (content.Pane != null && content.Pane.DockState != DockState.Document)
                {
                    content.IsHidden = contents[sortedContents[i]].IsHidden;
                }
            }

            // after all non-document DockContent, show document DockContent
            for (int i = 0; i < contents.Length; i++)
            {
                DockContent content = dockPanel.Contents[sortedContents[i]];
                if (content.Pane != null && content.Pane.DockState == DockState.Document)
                {
                    content.IsHidden = contents[sortedContents[i]].IsHidden;
                }
            }

            for (int i = 0; i < panes.Length; i++)
            {
                dockPanel.Panes[i].ActiveContent = panes[i].IndexActiveContent == -1 ? null : dockPanel.Contents[panes[i].IndexActiveContent];
            }

            if (dockPanelStruct.IndexActiveDocumentPane != -1)
            {
                dockPanel.Panes[dockPanelStruct.IndexActiveDocumentPane].Activate();
            }

            if (dockPanelStruct.IndexActivePane != -1)
            {
                dockPanel.Panes[dockPanelStruct.IndexActivePane].Activate();
            }

            for (int i = dockPanel.Contents.Count - 1; i >= 0; i--)
            {
                if (dockPanel.Contents[i] is DummyContent)
                {
                    dockPanel.Contents[i].Close();
                }
            }
        }