source: trunk/sources/HeuristicLab.ExtLibs/HeuristicLab.WinFormsUI/2.3.1/WinFormsUI-2.3.1/Docking/VS2005DockPaneStrip.cs @ 7489

using System;
using System.ComponentModel;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Windows.Forms;

namespace WeifenLuo.WinFormsUI.Docking {
  internal class VS2005DockPaneStrip : DockPaneStripBase {
    private class TabVS2005 : Tab {
      public TabVS2005(IDockContent content)
        : base(content) {
      }

      private int m_tabX;
      public int TabX {
        get { return m_tabX; }
        set { m_tabX = value; }
      }

      private int m_tabWidth;
      public int TabWidth {
        get { return m_tabWidth; }
        set { m_tabWidth = value; }
      }

      private int m_maxWidth;
      public int MaxWidth {
        get { return m_maxWidth; }
        set { m_maxWidth = value; }
      }

      private bool m_flag;
      protected internal bool Flag {
        get { return m_flag; }
        set { m_flag = value; }
      }
    }

    protected internal override DockPaneStripBase.Tab CreateTab(IDockContent content) {
      return new TabVS2005(content);
    }

    private sealed class InertButton : InertButtonBase {
      private Bitmap m_image0, m_image1;

      public InertButton(Bitmap image0, Bitmap image1)
        : base() {
        m_image0 = image0;
        m_image1 = image1;
      }

      private int m_imageCategory = 0;
      public int ImageCategory {
        get { return m_imageCategory; }
        set {
          if (m_imageCategory == value)
            return;

          m_imageCategory = value;
          Invalidate();
        }
      }

      public override Bitmap Image {
        get { return ImageCategory == 0 ? m_image0 : m_image1; }
      }
    }

    #region consts
    private const int _ToolWindowStripGapTop = 0;
    private const int _ToolWindowStripGapBottom = 1;
    private const int _ToolWindowStripGapLeft = 0;
    private const int _ToolWindowStripGapRight = 0;
    private const int _ToolWindowImageHeight = 16;
    private const int _ToolWindowImageWidth = 16;
    private const int _ToolWindowImageGapTop = 3;
    private const int _ToolWindowImageGapBottom = 1;
    private const int _ToolWindowImageGapLeft = 2;
    private const int _ToolWindowImageGapRight = 0;
    private const int _ToolWindowTextGapRight = 3;
    private const int _ToolWindowTabSeperatorGapTop = 3;
    private const int _ToolWindowTabSeperatorGapBottom = 3;

    private const int _DocumentStripGapTop = 0;
    private const int _DocumentStripGapBottom = 1;
    private const int _DocumentTabMaxWidth = 200;
    private const int _DocumentButtonGapTop = 4;
    private const int _DocumentButtonGapBottom = 4;
    private const int _DocumentButtonGapBetween = 0;
    private const int _DocumentButtonGapRight = 3;
    private const int _DocumentTabGapTop = 3;
    private const int _DocumentTabGapLeft = 3;
    private const int _DocumentTabGapRight = 3;
    private const int _DocumentIconGapBottom = 2;
    private const int _DocumentIconGapLeft = 8;
    private const int _DocumentIconGapRight = 0;
    private const int _DocumentIconHeight = 16;
    private const int _DocumentIconWidth = 16;
    private const int _DocumentTextGapRight = 3;
    #endregion

    private static Bitmap _imageButtonClose;
    private static Bitmap ImageButtonClose {
      get {
        if (_imageButtonClose == null)
          _imageButtonClose = Resources.DockPane_Close;

        return _imageButtonClose;
      }
    }

    private InertButton m_buttonClose;
    private InertButton ButtonClose {
      get {
        if (m_buttonClose == null) {
          m_buttonClose = new InertButton(ImageButtonClose, ImageButtonClose);
          m_toolTip.SetToolTip(m_buttonClose, ToolTipClose);
          m_buttonClose.Click += new EventHandler(Close_Click);
          Controls.Add(m_buttonClose);
        }

        return m_buttonClose;
      }
    }

    private static Bitmap _imageButtonWindowList;
    private static Bitmap ImageButtonWindowList {
      get {
        if (_imageButtonWindowList == null)
          _imageButtonWindowList = Resources.DockPane_Option;

        return _imageButtonWindowList;
      }
    }

    private static Bitmap _imageButtonWindowListOverflow;
    private static Bitmap ImageButtonWindowListOverflow {
      get {
        if (_imageButtonWindowListOverflow == null)
          _imageButtonWindowListOverflow = Resources.DockPane_OptionOverflow;

        return _imageButtonWindowListOverflow;
      }
    }

    private InertButton m_buttonWindowList;
    private InertButton ButtonWindowList {
      get {
        if (m_buttonWindowList == null) {
          m_buttonWindowList = new InertButton(ImageButtonWindowList, ImageButtonWindowListOverflow);
          m_toolTip.SetToolTip(m_buttonWindowList, ToolTipSelect);
          m_buttonWindowList.Click += new EventHandler(WindowList_Click);
          Controls.Add(m_buttonWindowList);
        }

        return m_buttonWindowList;
      }
    }

    private static GraphicsPath GraphicsPath {
      get { return VS2005AutoHideStrip.GraphicsPath; }
    }

    private IContainer m_components;
    private ToolTip m_toolTip;
    private IContainer Components {
      get { return m_components; }
    }

    #region Customizable Properties
    private static int ToolWindowStripGapTop {
      get { return _ToolWindowStripGapTop; }
    }

    private static int ToolWindowStripGapBottom {
      get { return _ToolWindowStripGapBottom; }
    }

    private static int ToolWindowStripGapLeft {
      get { return _ToolWindowStripGapLeft; }
    }

    private static int ToolWindowStripGapRight {
      get { return _ToolWindowStripGapRight; }
    }

    private static int ToolWindowImageHeight {
      get { return _ToolWindowImageHeight; }
    }

    private static int ToolWindowImageWidth {
      get { return _ToolWindowImageWidth; }
    }

    private static int ToolWindowImageGapTop {
      get { return _ToolWindowImageGapTop; }
    }

    private static int ToolWindowImageGapBottom {
      get { return _ToolWindowImageGapBottom; }
    }

    private static int ToolWindowImageGapLeft {
      get { return _ToolWindowImageGapLeft; }
    }

    private static int ToolWindowImageGapRight {
      get { return _ToolWindowImageGapRight; }
    }

    private static int ToolWindowTextGapRight {
      get { return _ToolWindowTextGapRight; }
    }

    private static int ToolWindowTabSeperatorGapTop {
      get { return _ToolWindowTabSeperatorGapTop; }
    }

    private static int ToolWindowTabSeperatorGapBottom {
      get { return _ToolWindowTabSeperatorGapBottom; }
    }

    private static string _toolTipClose;
    private static string ToolTipClose {
      get {
        if (_toolTipClose == null)
          _toolTipClose = Strings.DockPaneStrip_ToolTipClose;
        return _toolTipClose;
      }
    }

    private static string _toolTipSelect;
    private static string ToolTipSelect {
      get {
        if (_toolTipSelect == null)
          _toolTipSelect = Strings.DockPaneStrip_ToolTipWindowList;
        return _toolTipSelect;
      }
    }

    private TextFormatFlags ToolWindowTextFormat {
      get {
        TextFormatFlags textFormat = TextFormatFlags.EndEllipsis |
            TextFormatFlags.HorizontalCenter |
            TextFormatFlags.SingleLine |
            TextFormatFlags.VerticalCenter;
        if (RightToLeft == RightToLeft.Yes)
          return textFormat | TextFormatFlags.RightToLeft | TextFormatFlags.Right;
        else
          return textFormat;
      }
    }

    private static int DocumentStripGapTop {
      get { return _DocumentStripGapTop; }
    }

    private static int DocumentStripGapBottom {
      get { return _DocumentStripGapBottom; }
    }

    private TextFormatFlags DocumentTextFormat {
      get {
        TextFormatFlags textFormat = TextFormatFlags.EndEllipsis |
            TextFormatFlags.SingleLine |
            TextFormatFlags.VerticalCenter |
            TextFormatFlags.HorizontalCenter;
        if (RightToLeft == RightToLeft.Yes)
          return textFormat | TextFormatFlags.RightToLeft;
        else
          return textFormat;
      }
    }

    private static int DocumentTabMaxWidth {
      get { return _DocumentTabMaxWidth; }
    }

    private static int DocumentButtonGapTop {
      get { return _DocumentButtonGapTop; }
    }

    private static int DocumentButtonGapBottom {
      get { return _DocumentButtonGapBottom; }
    }

    private static int DocumentButtonGapBetween {
      get { return _DocumentButtonGapBetween; }
    }

    private static int DocumentButtonGapRight {
      get { return _DocumentButtonGapRight; }
    }

    private static int DocumentTabGapTop {
      get { return _DocumentTabGapTop; }
    }

    private static int DocumentTabGapLeft {
      get { return _DocumentTabGapLeft; }
    }

    private static int DocumentTabGapRight {
      get { return _DocumentTabGapRight; }
    }

    private static int DocumentIconGapBottom {
      get { return _DocumentIconGapBottom; }
    }

    private static int DocumentIconGapLeft {
      get { return _DocumentIconGapLeft; }
    }

    private static int DocumentIconGapRight {
      get { return _DocumentIconGapRight; }
    }

    private static int DocumentIconWidth {
      get { return _DocumentIconWidth; }
    }

    private static int DocumentIconHeight {
      get { return _DocumentIconHeight; }
    }

    private static int DocumentTextGapRight {
      get { return _DocumentTextGapRight; }
    }

    private static Pen PenToolWindowTabBorder {
      get { return SystemPens.GrayText; }
    }

    private static Pen PenDocumentTabActiveBorder {
      get { return SystemPens.ControlDarkDark; }
    }

    private static Pen PenDocumentTabInactiveBorder {
      get { return SystemPens.GrayText; }
    }
    #endregion

    public VS2005DockPaneStrip(DockPane pane)
      : base(pane) {
      SetStyle(ControlStyles.ResizeRedraw |
                ControlStyles.UserPaint |
                ControlStyles.AllPaintingInWmPaint |
                ControlStyles.OptimizedDoubleBuffer, true);

      SuspendLayout();

      m_components = new Container();
      m_toolTip = new ToolTip(Components);
      m_selectMenu = new ContextMenuStrip(Components);

      ResumeLayout();
    }

    protected override void Dispose(bool disposing) {
      if (disposing) {
        Components.Dispose();
        if (m_boldFont != null) {
          m_boldFont.Dispose();
          m_boldFont = null;
        }
      }
      base.Dispose(disposing);
    }

    private static Font TextFont {
      get { return SystemInformation.MenuFont; }
    }

    private Font m_font;
    private Font m_boldFont;
    private Font BoldFont {
      get {
        if (IsDisposed)
          return null;

        if (m_boldFont == null) {
          m_font = TextFont;
          m_boldFont = new Font(TextFont, FontStyle.Bold);
        } else if (m_font != TextFont) {
          m_boldFont.Dispose();
          m_font = TextFont;
          m_boldFont = new Font(TextFont, FontStyle.Bold);
        }

        return m_boldFont;
      }
    }

    private int m_startDisplayingTab = 0;
    private int StartDisplayingTab {
      get { return m_startDisplayingTab; }
      set {
        m_startDisplayingTab = value;
        Invalidate();
      }
    }

    private int m_endDisplayingTab = 0;
    private int EndDisplayingTab {
      get { return m_endDisplayingTab; }
      set { m_endDisplayingTab = value; }
    }

    private int m_firstDisplayingTab = 0;
    private int FirstDisplayingTab {
      get { return m_firstDisplayingTab; }
      set { m_firstDisplayingTab = value; }
    }

    private bool m_documentTabsOverflow = false;
    private bool DocumentTabsOverflow {
      set {
        if (m_documentTabsOverflow == value)
          return;

        m_documentTabsOverflow = value;
        if (value)
          ButtonWindowList.ImageCategory = 1;
        else
          ButtonWindowList.ImageCategory = 0;
      }
    }

    protected internal override int MeasureHeight() {
      if (Appearance == DockPane.AppearanceStyle.ToolWindow)
        return MeasureHeight_ToolWindow();
      else
        return MeasureHeight_Document();
    }

    private int MeasureHeight_ToolWindow() {
      if (DockPane.IsAutoHide || Tabs.Count <= 1)
        return 0;

      int height = Math.Max(TextFont.Height, ToolWindowImageHeight + ToolWindowImageGapTop + ToolWindowImageGapBottom)
          + ToolWindowStripGapTop + ToolWindowStripGapBottom;

      return height;
    }

    private int MeasureHeight_Document() {
      int height = Math.Max(TextFont.Height + DocumentTabGapTop,
        ButtonClose.Height + DocumentButtonGapTop + DocumentButtonGapBottom)
                + DocumentStripGapBottom + DocumentStripGapTop;

      return height;
    }

    protected override void OnPaint(PaintEventArgs e) {
      Rectangle rect = TabsRectangle;

      if (Appearance == DockPane.AppearanceStyle.Document) {
        rect.X -= DocumentTabGapLeft;

        // Add these values back in so that the DockStrip color is drawn
        // beneath the close button and window list button.
        rect.Width += DocumentTabGapLeft +
            DocumentTabGapRight +
            DocumentButtonGapRight +
            ButtonClose.Width +
            ButtonWindowList.Width;

        // It is possible depending on the DockPanel DocumentStyle to have
        // a Document without a DockStrip.
        if (rect.Width > 0 && rect.Height > 0) {
          Color startColor = DockPane.DockPanel.Skin.DockPaneStripSkin.DocumentGradient.DockStripGradient.StartColor;
          Color endColor = DockPane.DockPanel.Skin.DockPaneStripSkin.DocumentGradient.DockStripGradient.EndColor;
          LinearGradientMode gradientMode = DockPane.DockPanel.Skin.DockPaneStripSkin.DocumentGradient.DockStripGradient.LinearGradientMode;
          using (LinearGradientBrush brush = new LinearGradientBrush(rect, startColor, endColor, gradientMode)) {
            e.Graphics.FillRectangle(brush, rect);
          }
        }
      } else {
        Color startColor = DockPane.DockPanel.Skin.DockPaneStripSkin.ToolWindowGradient.DockStripGradient.StartColor;
        Color endColor = DockPane.DockPanel.Skin.DockPaneStripSkin.ToolWindowGradient.DockStripGradient.EndColor;
        LinearGradientMode gradientMode = DockPane.DockPanel.Skin.DockPaneStripSkin.ToolWindowGradient.DockStripGradient.LinearGradientMode;
        using (LinearGradientBrush brush = new LinearGradientBrush(rect, startColor, endColor, gradientMode)) {
          e.Graphics.FillRectangle(brush, rect);
        }
      }
      base.OnPaint(e);
      CalculateTabs();
      if (Appearance == DockPane.AppearanceStyle.Document && DockPane.ActiveContent != null) {
        if (EnsureDocumentTabVisible(DockPane.ActiveContent, false))
          CalculateTabs();
      }

      DrawTabStrip(e.Graphics);
    }

    protected override void OnRefreshChanges() {
      SetInertButtons();
      Invalidate();
    }

    protected internal override GraphicsPath GetOutline(int index) {

      if (Appearance == DockPane.AppearanceStyle.Document)
        return GetOutline_Document(index);
      else
        return GetOutline_ToolWindow(index);

    }

    private GraphicsPath GetOutline_Document(int index) {
      Rectangle rectTab = GetTabRectangle(index);
      rectTab.X -= rectTab.Height / 2;
      rectTab.Intersect(TabsRectangle);
      rectTab = RectangleToScreen(DrawHelper.RtlTransform(this, rectTab));
      Rectangle rectPaneClient = DockPane.RectangleToScreen(DockPane.ClientRectangle);

      GraphicsPath path = new GraphicsPath();
      GraphicsPath pathTab = GetTabOutline_Document(Tabs[index], true, true, true);
      path.AddPath(pathTab, true);

      if (DockPane.DockPanel.DocumentTabStripLocation == DocumentTabStripLocation.Bottom) {
        path.AddLine(rectTab.Right, rectTab.Top, rectPaneClient.Right, rectTab.Top);
        path.AddLine(rectPaneClient.Right, rectTab.Top, rectPaneClient.Right, rectPaneClient.Top);
        path.AddLine(rectPaneClient.Right, rectPaneClient.Top, rectPaneClient.Left, rectPaneClient.Top);
        path.AddLine(rectPaneClient.Left, rectPaneClient.Top, rectPaneClient.Left, rectTab.Top);
        path.AddLine(rectPaneClient.Left, rectTab.Top, rectTab.Right, rectTab.Top);
      } else {
        path.AddLine(rectTab.Right, rectTab.Bottom, rectPaneClient.Right, rectTab.Bottom);
        path.AddLine(rectPaneClient.Right, rectTab.Bottom, rectPaneClient.Right, rectPaneClient.Bottom);
        path.AddLine(rectPaneClient.Right, rectPaneClient.Bottom, rectPaneClient.Left, rectPaneClient.Bottom);
        path.AddLine(rectPaneClient.Left, rectPaneClient.Bottom, rectPaneClient.Left, rectTab.Bottom);
        path.AddLine(rectPaneClient.Left, rectTab.Bottom, rectTab.Right, rectTab.Bottom);
      }
      return path;
    }

    private GraphicsPath GetOutline_ToolWindow(int index) {
      Rectangle rectTab = GetTabRectangle(index);
      rectTab.Intersect(TabsRectangle);
      rectTab = RectangleToScreen(DrawHelper.RtlTransform(this, rectTab));
      int y = rectTab.Top;
      Rectangle rectPaneClient = DockPane.RectangleToScreen(DockPane.ClientRectangle);

      GraphicsPath path = new GraphicsPath();
      GraphicsPath pathTab = GetTabOutline(Tabs[index], true, true);
      path.AddPath(pathTab, true);
      path.AddLine(rectTab.Left, rectTab.Top, rectPaneClient.Left, rectTab.Top);
      path.AddLine(rectPaneClient.Left, rectTab.Top, rectPaneClient.Left, rectPaneClient.Top);
      path.AddLine(rectPaneClient.Left, rectPaneClient.Top, rectPaneClient.Right, rectPaneClient.Top);
      path.AddLine(rectPaneClient.Right, rectPaneClient.Top, rectPaneClient.Right, rectTab.Top);
      path.AddLine(rectPaneClient.Right, rectTab.Top, rectTab.Right, rectTab.Top);
      return path;
    }

    private void CalculateTabs() {
      if (Appearance == DockPane.AppearanceStyle.ToolWindow)
        CalculateTabs_ToolWindow();
      else
        CalculateTabs_Document();
    }

    private void CalculateTabs_ToolWindow() {
      if (Tabs.Count <= 1 || DockPane.IsAutoHide)
        return;

      Rectangle rectTabStrip = TabStripRectangle;

      // Calculate tab widths
      int countTabs = Tabs.Count;
      foreach (TabVS2005 tab in Tabs) {
        tab.MaxWidth = GetMaxTabWidth(Tabs.IndexOf(tab));
        tab.Flag = false;
      }

      // Set tab whose max width less than average width
      bool anyWidthWithinAverage = true;
      int totalWidth = rectTabStrip.Width - ToolWindowStripGapLeft - ToolWindowStripGapRight;
      int totalAllocatedWidth = 0;
      int averageWidth = totalWidth / countTabs;
      int remainedTabs = countTabs;
      for (anyWidthWithinAverage = true; anyWidthWithinAverage && remainedTabs > 0; ) {
        anyWidthWithinAverage = false;
        foreach (TabVS2005 tab in Tabs) {
          if (tab.Flag)
            continue;

          if (tab.MaxWidth <= averageWidth) {
            tab.Flag = true;
            tab.TabWidth = tab.MaxWidth;
            totalAllocatedWidth += tab.TabWidth;
            anyWidthWithinAverage = true;
            remainedTabs--;
          }
        }
        if (remainedTabs != 0)
          averageWidth = (totalWidth - totalAllocatedWidth) / remainedTabs;
      }

      // If any tab width not set yet, set it to the average width
      if (remainedTabs > 0) {
        int roundUpWidth = (totalWidth - totalAllocatedWidth) - (averageWidth * remainedTabs);
        foreach (TabVS2005 tab in Tabs) {
          if (tab.Flag)
            continue;

          tab.Flag = true;
          if (roundUpWidth > 0) {
            tab.TabWidth = averageWidth + 1;
            roundUpWidth--;
          } else
            tab.TabWidth = averageWidth;
        }
      }

      // Set the X position of the tabs
      int x = rectTabStrip.X + ToolWindowStripGapLeft;
      foreach (TabVS2005 tab in Tabs) {
        tab.TabX = x;
        x += tab.TabWidth;
      }
    }

    private bool CalculateDocumentTab(Rectangle rectTabStrip, ref int x, int index) {
      bool overflow = false;

      TabVS2005 tab = Tabs[index] as TabVS2005;
      tab.MaxWidth = GetMaxTabWidth(index);
      int width = Math.Min(tab.MaxWidth, DocumentTabMaxWidth);
      if (x + width < rectTabStrip.Right || index == StartDisplayingTab) {
        tab.TabX = x;
        tab.TabWidth = width;
        EndDisplayingTab = index;
      } else {
        tab.TabX = 0;
        tab.TabWidth = 0;
        overflow = true;
      }
      x += width;

      return overflow;
    }

    /// <summary>
    /// Calculate which tabs are displayed and in what order.
    /// </summary>
    private void CalculateTabs_Document() {
      if (m_startDisplayingTab >= Tabs.Count)
        m_startDisplayingTab = 0;

      Rectangle rectTabStrip = TabsRectangle;

      int x = rectTabStrip.X + rectTabStrip.Height / 2;
      bool overflow = false;

      // Originally all new documents that were considered overflow
      // (not enough pane strip space to show all tabs) were added to
      // the far left (assuming not right to left) and the tabs on the
      // right were dropped from view. If StartDisplayingTab is not 0
      // then we are dealing with making sure a specific tab is kept in focus.
      if (m_startDisplayingTab > 0) {
        int tempX = x;
        TabVS2005 tab = Tabs[m_startDisplayingTab] as TabVS2005;
        tab.MaxWidth = GetMaxTabWidth(m_startDisplayingTab);
        int width = Math.Min(tab.MaxWidth, DocumentTabMaxWidth);

        // Add the active tab and tabs to the left
        for (int i = StartDisplayingTab; i >= 0; i--)
          CalculateDocumentTab(rectTabStrip, ref tempX, i);

        // Store which tab is the first one displayed so that it
        // will be drawn correctly (without part of the tab cut off)
        FirstDisplayingTab = EndDisplayingTab;

        tempX = x; // Reset X location because we are starting over

        // Start with the first tab displayed - name is a little misleading.
        // Loop through each tab and set its location. If there is not enough
        // room for all of them overflow will be returned.
        for (int i = EndDisplayingTab; i < Tabs.Count; i++)
          overflow = CalculateDocumentTab(rectTabStrip, ref tempX, i);

        // If not all tabs are shown then we have an overflow.
        if (FirstDisplayingTab != 0)
          overflow = true;
      } else {
        for (int i = StartDisplayingTab; i < Tabs.Count; i++)
          overflow = CalculateDocumentTab(rectTabStrip, ref x, i);
        for (int i = 0; i < StartDisplayingTab; i++)
          overflow = CalculateDocumentTab(rectTabStrip, ref x, i);

        FirstDisplayingTab = StartDisplayingTab;
      }

      if (!overflow) {
        m_startDisplayingTab = 0;
        FirstDisplayingTab = 0;
        x = rectTabStrip.X + rectTabStrip.Height / 2;
        foreach (TabVS2005 tab in Tabs) {
          tab.TabX = x;
          x += tab.TabWidth;
        }
      }
      DocumentTabsOverflow = overflow;
    }

    protected internal override void EnsureTabVisible(IDockContent content) {
      if (Appearance != DockPane.AppearanceStyle.Document || !Tabs.Contains(content))
        return;

      CalculateTabs();
      EnsureDocumentTabVisible(content, true);
    }

    private bool EnsureDocumentTabVisible(IDockContent content, bool repaint) {
      int index = Tabs.IndexOf(content);
      TabVS2005 tab = Tabs[index] as TabVS2005;
      if (tab.TabWidth != 0)
        return false;

      StartDisplayingTab = index;
      if (repaint)
        Invalidate();

      return true;
    }

    private int GetMaxTabWidth(int index) {
      if (Appearance == DockPane.AppearanceStyle.ToolWindow)
        return GetMaxTabWidth_ToolWindow(index);
      else
        return GetMaxTabWidth_Document(index);
    }

    private int GetMaxTabWidth_ToolWindow(int index) {
      IDockContent content = Tabs[index].Content;
      Size sizeString = TextRenderer.MeasureText(content.DockHandler.TabText, TextFont);
      return ToolWindowImageWidth + sizeString.Width + ToolWindowImageGapLeft
        + ToolWindowImageGapRight + ToolWindowTextGapRight;
    }

    private int GetMaxTabWidth_Document(int index) {
      IDockContent content = Tabs[index].Content;

      int height = GetTabRectangle_Document(index).Height;

      Size sizeText = TextRenderer.MeasureText(content.DockHandler.TabText, BoldFont, new Size(DocumentTabMaxWidth, height), DocumentTextFormat);

      if (DockPane.DockPanel.ShowDocumentIcon)
        return sizeText.Width + DocumentIconWidth + DocumentIconGapLeft + DocumentIconGapRight + DocumentTextGapRight;
      else
        return sizeText.Width + DocumentIconGapLeft + DocumentTextGapRight;
    }

    private void DrawTabStrip(Graphics g) {
      if (Appearance == DockPane.AppearanceStyle.Document)
        DrawTabStrip_Document(g);
      else
        DrawTabStrip_ToolWindow(g);
    }

    private void DrawTabStrip_Document(Graphics g) {
      int count = Tabs.Count;
      if (count == 0)
        return;

      Rectangle rectTabStrip = TabStripRectangle;

      // Draw the tabs
      Rectangle rectTabOnly = TabsRectangle;
      Rectangle rectTab = Rectangle.Empty;
      TabVS2005 tabActive = null;
      g.SetClip(DrawHelper.RtlTransform(this, rectTabOnly));
      for (int i = 0; i < count; i++) {
        rectTab = GetTabRectangle(i);
        if (Tabs[i].Content == DockPane.ActiveContent) {
          tabActive = Tabs[i] as TabVS2005;
          continue;
        }
        if (rectTab.IntersectsWith(rectTabOnly))
          DrawTab(g, Tabs[i] as TabVS2005, rectTab);
      }

      g.SetClip(rectTabStrip);

      if (DockPane.DockPanel.DocumentTabStripLocation == DocumentTabStripLocation.Bottom)
        g.DrawLine(PenDocumentTabActiveBorder, rectTabStrip.Left, rectTabStrip.Top + 1,
          rectTabStrip.Right, rectTabStrip.Top + 1);
      else
        g.DrawLine(PenDocumentTabActiveBorder, rectTabStrip.Left, rectTabStrip.Bottom - 1,
            rectTabStrip.Right, rectTabStrip.Bottom - 1);

      g.SetClip(DrawHelper.RtlTransform(this, rectTabOnly));
      if (tabActive != null) {
        rectTab = GetTabRectangle(Tabs.IndexOf(tabActive));
        if (rectTab.IntersectsWith(rectTabOnly))
          DrawTab(g, tabActive, rectTab);
      }
    }

    private void DrawTabStrip_ToolWindow(Graphics g) {
      Rectangle rectTabStrip = TabStripRectangle;

      g.DrawLine(PenToolWindowTabBorder, rectTabStrip.Left, rectTabStrip.Top,
        rectTabStrip.Right, rectTabStrip.Top);

      for (int i = 0; i < Tabs.Count; i++)
        DrawTab(g, Tabs[i] as TabVS2005, GetTabRectangle(i));
    }

    private Rectangle GetTabRectangle(int index) {
      if (Appearance == DockPane.AppearanceStyle.ToolWindow)
        return GetTabRectangle_ToolWindow(index);
      else
        return GetTabRectangle_Document(index);
    }

    private Rectangle GetTabRectangle_ToolWindow(int index) {
      Rectangle rectTabStrip = TabStripRectangle;

      TabVS2005 tab = (TabVS2005)(Tabs[index]);
      return new Rectangle(tab.TabX, rectTabStrip.Y, tab.TabWidth, rectTabStrip.Height);
    }

    private Rectangle GetTabRectangle_Document(int index) {
      Rectangle rectTabStrip = TabStripRectangle;
      TabVS2005 tab = (TabVS2005)Tabs[index];

      Rectangle rect = new Rectangle();
      rect.X = tab.TabX;
      rect.Width = tab.TabWidth;
      rect.Height = rectTabStrip.Height - DocumentTabGapTop;

      if (DockPane.DockPanel.DocumentTabStripLocation == DocumentTabStripLocation.Bottom)
        rect.Y = rectTabStrip.Y + DocumentStripGapBottom;
      else
        rect.Y = rectTabStrip.Y + DocumentTabGapTop;

      return rect;
    }

    private void DrawTab(Graphics g, TabVS2005 tab, Rectangle rect) {
      if (Appearance == DockPane.AppearanceStyle.ToolWindow)
        DrawTab_ToolWindow(g, tab, rect);
      else
        DrawTab_Document(g, tab, rect);
    }

    private GraphicsPath GetTabOutline(Tab tab, bool rtlTransform, bool toScreen) {
      if (Appearance == DockPane.AppearanceStyle.ToolWindow)
        return GetTabOutline_ToolWindow(tab, rtlTransform, toScreen);
      else
        return GetTabOutline_Document(tab, rtlTransform, toScreen, false);
    }

    private GraphicsPath GetTabOutline_ToolWindow(Tab tab, bool rtlTransform, bool toScreen) {
      Rectangle rect = GetTabRectangle(Tabs.IndexOf(tab));
      if (rtlTransform)
        rect = DrawHelper.RtlTransform(this, rect);
      if (toScreen)
        rect = RectangleToScreen(rect);

      DrawHelper.GetRoundedCornerTab(GraphicsPath, rect, false);
      return GraphicsPath;
    }

    private GraphicsPath GetTabOutline_Document(Tab tab, bool rtlTransform, bool toScreen, bool full) {
      int curveSize = 6;

      GraphicsPath.Reset();
      Rectangle rect = GetTabRectangle(Tabs.IndexOf(tab));
      if (rtlTransform)
        rect = DrawHelper.RtlTransform(this, rect);
      if (toScreen)
        rect = RectangleToScreen(rect);

      // Draws the full angle piece for active content (or first tab)
      if (tab.Content == DockPane.ActiveContent || full || Tabs.IndexOf(tab) == FirstDisplayingTab) {
        if (RightToLeft == RightToLeft.Yes) {
          if (DockPane.DockPanel.DocumentTabStripLocation == DocumentTabStripLocation.Bottom) {
            // For some reason the next line draws a line that is not hidden like it is when drawing the tab strip on top.
            // It is not needed so it has been commented out.
            //GraphicsPath.AddLine(rect.Right, rect.Bottom, rect.Right + rect.Height / 2, rect.Bottom);
            GraphicsPath.AddLine(rect.Right + rect.Height / 2, rect.Top, rect.Right - rect.Height / 2 + curveSize / 2, rect.Bottom - curveSize / 2);
          } else {
            GraphicsPath.AddLine(rect.Right, rect.Bottom, rect.Right + rect.Height / 2, rect.Bottom);
            GraphicsPath.AddLine(rect.Right + rect.Height / 2, rect.Bottom, rect.Right - rect.Height / 2 + curveSize / 2, rect.Top + curveSize / 2);
          }
        } else {
          if (DockPane.DockPanel.DocumentTabStripLocation == DocumentTabStripLocation.Bottom) {
            // For some reason the next line draws a line that is not hidden like it is when drawing the tab strip on top.
            // It is not needed so it has been commented out.
            //GraphicsPath.AddLine(rect.Left, rect.Top, rect.Left - rect.Height / 2, rect.Top);
            GraphicsPath.AddLine(rect.Left - rect.Height / 2, rect.Top, rect.Left + rect.Height / 2 - curveSize / 2, rect.Bottom - curveSize / 2);
          } else {
            GraphicsPath.AddLine(rect.Left, rect.Bottom, rect.Left - rect.Height / 2, rect.Bottom);
            GraphicsPath.AddLine(rect.Left - rect.Height / 2, rect.Bottom, rect.Left + rect.Height / 2 - curveSize / 2, rect.Top + curveSize / 2);
          }
        }
      }
        // Draws the partial angle for non-active content
      else {
        if (RightToLeft == RightToLeft.Yes) {
          if (DockPane.DockPanel.DocumentTabStripLocation == DocumentTabStripLocation.Bottom) {
            GraphicsPath.AddLine(rect.Right, rect.Top, rect.Right, rect.Top + rect.Height / 2);
            GraphicsPath.AddLine(rect.Right, rect.Top + rect.Height / 2, rect.Right - rect.Height / 2 + curveSize / 2, rect.Bottom - curveSize / 2);
          } else {
            GraphicsPath.AddLine(rect.Right, rect.Bottom, rect.Right, rect.Bottom - rect.Height / 2);
            GraphicsPath.AddLine(rect.Right, rect.Bottom - rect.Height / 2, rect.Right - rect.Height / 2 + curveSize / 2, rect.Top + curveSize / 2);
          }
        } else {
          if (DockPane.DockPanel.DocumentTabStripLocation == DocumentTabStripLocation.Bottom) {
            GraphicsPath.AddLine(rect.Left, rect.Top, rect.Left, rect.Top + rect.Height / 2);
            GraphicsPath.AddLine(rect.Left, rect.Top + rect.Height / 2, rect.Left + rect.Height / 2 - curveSize / 2, rect.Bottom - curveSize / 2);
          } else {
            GraphicsPath.AddLine(rect.Left, rect.Bottom, rect.Left, rect.Bottom - rect.Height / 2);
            GraphicsPath.AddLine(rect.Left, rect.Bottom - rect.Height / 2, rect.Left + rect.Height / 2 - curveSize / 2, rect.Top + curveSize / 2);
          }
        }
      }

      if (RightToLeft == RightToLeft.Yes) {
        if (DockPane.DockPanel.DocumentTabStripLocation == DocumentTabStripLocation.Bottom) {
          // Draws the bottom horizontal line (short side)
          GraphicsPath.AddLine(rect.Right - rect.Height / 2 - curveSize / 2, rect.Bottom, rect.Left + curveSize / 2, rect.Bottom);

          // Drawing the rounded corner is not necessary. The path is automatically connected
          //GraphicsPath.AddArc(new Rectangle(rect.Left, rect.Top, curveSize, curveSize), 180, 90);
        } else {
          // Draws the bottom horizontal line (short side)
          GraphicsPath.AddLine(rect.Right - rect.Height / 2 - curveSize / 2, rect.Top, rect.Left + curveSize / 2, rect.Top);
          GraphicsPath.AddArc(new Rectangle(rect.Left, rect.Top, curveSize, curveSize), 180, 90);
        }
      } else {
        if (DockPane.DockPanel.DocumentTabStripLocation == DocumentTabStripLocation.Bottom) {
          // Draws the bottom horizontal line (short side)
          GraphicsPath.AddLine(rect.Left + rect.Height / 2 + curveSize / 2, rect.Bottom, rect.Right - curveSize / 2, rect.Bottom);

          // Drawing the rounded corner is not necessary. The path is automatically connected
          //GraphicsPath.AddArc(new Rectangle(rect.Right - curveSize, rect.Bottom, curveSize, curveSize), 90, -90);
        } else {
          // Draws the top horizontal line (short side)
          GraphicsPath.AddLine(rect.Left + rect.Height / 2 + curveSize / 2, rect.Top, rect.Right - curveSize / 2, rect.Top);

          // Draws the rounded corner oppposite the angled side
          GraphicsPath.AddArc(new Rectangle(rect.Right - curveSize, rect.Top, curveSize, curveSize), -90, 90);
        }
      }

      if (Tabs.IndexOf(tab) != EndDisplayingTab &&
          (Tabs.IndexOf(tab) != Tabs.Count - 1 && Tabs[Tabs.IndexOf(tab) + 1].Content == DockPane.ActiveContent)
          && !full) {
        if (RightToLeft == RightToLeft.Yes) {
          if (DockPane.DockPanel.DocumentTabStripLocation == DocumentTabStripLocation.Bottom) {
            GraphicsPath.AddLine(rect.Left, rect.Bottom - curveSize / 2, rect.Left, rect.Bottom - rect.Height / 2);
            GraphicsPath.AddLine(rect.Left, rect.Bottom - rect.Height / 2, rect.Left + rect.Height / 2, rect.Top);
          } else {
            GraphicsPath.AddLine(rect.Left, rect.Top + curveSize / 2, rect.Left, rect.Top + rect.Height / 2);
            GraphicsPath.AddLine(rect.Left, rect.Top + rect.Height / 2, rect.Left + rect.Height / 2, rect.Bottom);
          }
        } else {
          if (DockPane.DockPanel.DocumentTabStripLocation == DocumentTabStripLocation.Bottom) {
            GraphicsPath.AddLine(rect.Right, rect.Bottom - curveSize / 2, rect.Right, rect.Bottom - rect.Height / 2);
            GraphicsPath.AddLine(rect.Right, rect.Bottom - rect.Height / 2, rect.Right - rect.Height / 2, rect.Top);
          } else {
            GraphicsPath.AddLine(rect.Right, rect.Top + curveSize / 2, rect.Right, rect.Top + rect.Height / 2);
            GraphicsPath.AddLine(rect.Right, rect.Top + rect.Height / 2, rect.Right - rect.Height / 2, rect.Bottom);
          }
        }
      } else {
        // Draw the vertical line opposite the angled side
        if (RightToLeft == RightToLeft.Yes) {
          if (DockPane.DockPanel.DocumentTabStripLocation == DocumentTabStripLocation.Bottom)
            GraphicsPath.AddLine(rect.Left, rect.Bottom - curveSize / 2, rect.Left, rect.Top);
          else
            GraphicsPath.AddLine(rect.Left, rect.Top + curveSize / 2, rect.Left, rect.Bottom);
        } else {
          if (DockPane.DockPanel.DocumentTabStripLocation == DocumentTabStripLocation.Bottom)
            GraphicsPath.AddLine(rect.Right, rect.Bottom - curveSize / 2, rect.Right, rect.Top);
          else
            GraphicsPath.AddLine(rect.Right, rect.Top + curveSize / 2, rect.Right, rect.Bottom);
        }
      }

      return GraphicsPath;
    }

    private void DrawTab_ToolWindow(Graphics g, TabVS2005 tab, Rectangle rect) {
      Rectangle rectIcon = new Rectangle(
        rect.X + ToolWindowImageGapLeft,
        rect.Y + rect.Height - 1 - ToolWindowImageGapBottom - ToolWindowImageHeight,
        ToolWindowImageWidth, ToolWindowImageHeight);
      Rectangle rectText = rectIcon;
      rectText.X += rectIcon.Width + ToolWindowImageGapRight;
      rectText.Width = rect.Width - rectIcon.Width - ToolWindowImageGapLeft -
        ToolWindowImageGapRight - ToolWindowTextGapRight;

      Rectangle rectTab = DrawHelper.RtlTransform(this, rect);
      rectText = DrawHelper.RtlTransform(this, rectText);
      rectIcon = DrawHelper.RtlTransform(this, rectIcon);
      GraphicsPath path = GetTabOutline(tab, true, false);
      if (DockPane.ActiveContent == tab.Content) {
        Color startColor = DockPane.DockPanel.Skin.DockPaneStripSkin.ToolWindowGradient.ActiveTabGradient.StartColor;
        Color endColor = DockPane.DockPanel.Skin.DockPaneStripSkin.ToolWindowGradient.ActiveTabGradient.EndColor;
        LinearGradientMode gradientMode = DockPane.DockPanel.Skin.DockPaneStripSkin.ToolWindowGradient.ActiveTabGradient.LinearGradientMode;
        g.FillPath(new LinearGradientBrush(rectTab, startColor, endColor, gradientMode), path);
        g.DrawPath(PenToolWindowTabBorder, path);

        Color textColor = DockPane.DockPanel.Skin.DockPaneStripSkin.ToolWindowGradient.ActiveTabGradient.TextColor;
        TextRenderer.DrawText(g, tab.Content.DockHandler.TabText, TextFont, rectText, textColor, ToolWindowTextFormat);
      } else {
        Color startColor = DockPane.DockPanel.Skin.DockPaneStripSkin.ToolWindowGradient.InactiveTabGradient.StartColor;
        Color endColor = DockPane.DockPanel.Skin.DockPaneStripSkin.ToolWindowGradient.InactiveTabGradient.EndColor;
        LinearGradientMode gradientMode = DockPane.DockPanel.Skin.DockPaneStripSkin.ToolWindowGradient.InactiveTabGradient.LinearGradientMode;
        g.FillPath(new LinearGradientBrush(rectTab, startColor, endColor, gradientMode), path);

        if (Tabs.IndexOf(DockPane.ActiveContent) != Tabs.IndexOf(tab) + 1) {
          Point pt1 = new Point(rect.Right, rect.Top + ToolWindowTabSeperatorGapTop);
          Point pt2 = new Point(rect.Right, rect.Bottom - ToolWindowTabSeperatorGapBottom);
          g.DrawLine(PenToolWindowTabBorder, DrawHelper.RtlTransform(this, pt1), DrawHelper.RtlTransform(this, pt2));
        }

        Color textColor = DockPane.DockPanel.Skin.DockPaneStripSkin.ToolWindowGradient.InactiveTabGradient.TextColor;
        TextRenderer.DrawText(g, tab.Content.DockHandler.TabText, TextFont, rectText, textColor, ToolWindowTextFormat);
      }

      if (rectTab.Contains(rectIcon))
        g.DrawIcon(tab.Content.DockHandler.Icon, rectIcon);
    }

    private void DrawTab_Document(Graphics g, TabVS2005 tab, Rectangle rect) {
      if (tab.TabWidth == 0)
        return;

      Rectangle rectIcon = new Rectangle(
          rect.X + DocumentIconGapLeft,
          rect.Y + rect.Height - 1 - DocumentIconGapBottom - DocumentIconHeight,
          DocumentIconWidth, DocumentIconHeight);
      Rectangle rectText = rectIcon;
      if (DockPane.DockPanel.ShowDocumentIcon) {
        rectText.X += rectIcon.Width + DocumentIconGapRight;
        rectText.Y = rect.Y;
        rectText.Width = rect.Width - rectIcon.Width - DocumentIconGapLeft -
            DocumentIconGapRight - DocumentTextGapRight;
        rectText.Height = rect.Height;
      } else
        rectText.Width = rect.Width - DocumentIconGapLeft - DocumentTextGapRight;

      Rectangle rectTab = DrawHelper.RtlTransform(this, rect);
      Rectangle rectBack = DrawHelper.RtlTransform(this, rect);
      rectBack.Width += rect.X;
      rectBack.X = 0;

      rectText = DrawHelper.RtlTransform(this, rectText);
      rectIcon = DrawHelper.RtlTransform(this, rectIcon);
      GraphicsPath path = GetTabOutline(tab, true, false);
      if (DockPane.ActiveContent == tab.Content) {
        Color startColor = DockPane.DockPanel.Skin.DockPaneStripSkin.DocumentGradient.ActiveTabGradient.StartColor;
        Color endColor = DockPane.DockPanel.Skin.DockPaneStripSkin.DocumentGradient.ActiveTabGradient.EndColor;
        LinearGradientMode gradientMode = DockPane.DockPanel.Skin.DockPaneStripSkin.DocumentGradient.ActiveTabGradient.LinearGradientMode;
        g.FillPath(new LinearGradientBrush(rectBack, startColor, endColor, gradientMode), path);
        g.DrawPath(PenDocumentTabActiveBorder, path);

        Color textColor = DockPane.DockPanel.Skin.DockPaneStripSkin.DocumentGradient.ActiveTabGradient.TextColor;
        if (DockPane.IsActiveDocumentPane)
          TextRenderer.DrawText(g, tab.Content.DockHandler.TabText, BoldFont, rectText, textColor, DocumentTextFormat);
        else
          TextRenderer.DrawText(g, tab.Content.DockHandler.TabText, TextFont, rectText, textColor, DocumentTextFormat);
      } else {
        Color startColor = DockPane.DockPanel.Skin.DockPaneStripSkin.DocumentGradient.InactiveTabGradient.StartColor;
        Color endColor = DockPane.DockPanel.Skin.DockPaneStripSkin.DocumentGradient.InactiveTabGradient.EndColor;
        LinearGradientMode gradientMode = DockPane.DockPanel.Skin.DockPaneStripSkin.DocumentGradient.InactiveTabGradient.LinearGradientMode;
        g.FillPath(new LinearGradientBrush(rectBack, startColor, endColor, gradientMode), path);
        g.DrawPath(PenDocumentTabInactiveBorder, path);

        Color textColor = DockPane.DockPanel.Skin.DockPaneStripSkin.DocumentGradient.InactiveTabGradient.TextColor;
        TextRenderer.DrawText(g, tab.Content.DockHandler.TabText, TextFont, rectText, textColor, DocumentTextFormat);
      }

      if (rectTab.Contains(rectIcon) && DockPane.DockPanel.ShowDocumentIcon)
        g.DrawIcon(tab.Content.DockHandler.Icon, rectIcon);
    }

    private Rectangle TabStripRectangle {
      get {
        if (Appearance == DockPane.AppearanceStyle.Document)
          return TabStripRectangle_Document;
        else
          return TabStripRectangle_ToolWindow;
      }
    }

    private Rectangle TabStripRectangle_ToolWindow {
      get {
        Rectangle rect = ClientRectangle;
        return new Rectangle(rect.X, rect.Top + ToolWindowStripGapTop, rect.Width, rect.Height - ToolWindowStripGapTop - ToolWindowStripGapBottom);
      }
    }

    private Rectangle TabStripRectangle_Document {
      get {
        Rectangle rect = ClientRectangle;
        return new Rectangle(rect.X, rect.Top + DocumentStripGapTop, rect.Width, rect.Height - DocumentStripGapTop - ToolWindowStripGapBottom);
      }
    }

    private Rectangle TabsRectangle {
      get {
        if (Appearance == DockPane.AppearanceStyle.ToolWindow)
          return TabStripRectangle;

        Rectangle rectWindow = TabStripRectangle;
        int x = rectWindow.X;
        int y = rectWindow.Y;
        int width = rectWindow.Width;
        int height = rectWindow.Height;

        x += DocumentTabGapLeft;
        width -= DocumentTabGapLeft +
            DocumentTabGapRight +
            DocumentButtonGapRight +
            ButtonClose.Width +
            ButtonWindowList.Width +
            2 * DocumentButtonGapBetween;

        return new Rectangle(x, y, width, height);
      }
    }

    private ContextMenuStrip m_selectMenu;
    private ContextMenuStrip SelectMenu {
      get { return m_selectMenu; }
    }

    private void WindowList_Click(object sender, EventArgs e) {
      int x = 0;
      int y = ButtonWindowList.Location.Y + ButtonWindowList.Height;

      SelectMenu.Items.Clear();
      foreach (TabVS2005 tab in Tabs) {
        IDockContent content = tab.Content;
        ToolStripItem item = SelectMenu.Items.Add(content.DockHandler.TabText, content.DockHandler.Icon.ToBitmap());
        item.Tag = tab.Content;
        item.Click += new EventHandler(ContextMenuItem_Click);
      }
      SelectMenu.Show(ButtonWindowList, x, y);
    }

    private void ContextMenuItem_Click(object sender, EventArgs e) {
      ToolStripMenuItem item = sender as ToolStripMenuItem;
      if (item != null) {
        IDockContent content = (IDockContent)item.Tag;
        DockPane.ActiveContent = content;
      }
    }

    private void SetInertButtons() {
      if (Appearance == DockPane.AppearanceStyle.ToolWindow) {
        if (m_buttonClose != null)
          m_buttonClose.Left = -m_buttonClose.Width;

        if (m_buttonWindowList != null)
          m_buttonWindowList.Left = -m_buttonWindowList.Width;
      } else {
        bool showCloseButton = DockPane.ActiveContent == null ? true : DockPane.ActiveContent.DockHandler.CloseButton;
        ButtonClose.Enabled = showCloseButton;
        ButtonClose.Visible = DockPane.ActiveContent == null ? true : DockPane.ActiveContent.DockHandler.CloseButtonVisible;
        ButtonClose.RefreshChanges();
        ButtonWindowList.RefreshChanges();
      }
    }

    protected override void OnLayout(LayoutEventArgs levent) {
      if (Appearance != DockPane.AppearanceStyle.Document) {
        base.OnLayout(levent);
        return;
      }

      Rectangle rectTabStrip = TabStripRectangle;

      // Set position and size of the buttons
      int buttonWidth = ButtonClose.Image.Width;
      int buttonHeight = ButtonClose.Image.Height;
      int height = rectTabStrip.Height - DocumentButtonGapTop - DocumentButtonGapBottom;
      if (buttonHeight < height) {
        buttonWidth = buttonWidth * (height / buttonHeight);
        buttonHeight = height;
      }
      Size buttonSize = new Size(buttonWidth, buttonHeight);

      int x = rectTabStrip.X + rectTabStrip.Width - DocumentTabGapLeft
        - DocumentButtonGapRight - buttonWidth;
      int y = rectTabStrip.Y + DocumentButtonGapTop;
      Point point = new Point(x, y);
      ButtonClose.Bounds = DrawHelper.RtlTransform(this, new Rectangle(point, buttonSize));

      // If the close button is not visible draw the window list button overtop.
      // Otherwise it is drawn to the left of the close button.
      if (ButtonClose.Visible)
        point.Offset(-(DocumentButtonGapBetween + buttonWidth), 0);

      ButtonWindowList.Bounds = DrawHelper.RtlTransform(this, new Rectangle(point, buttonSize));

      OnRefreshChanges();

      base.OnLayout(levent);
    }

    private void Close_Click(object sender, EventArgs e) {
      DockPane.CloseActiveContent();
    }

    protected internal override int HitTest(Point ptMouse) {
      Rectangle rectTabStrip = TabsRectangle;
      if (!TabsRectangle.Contains(ptMouse))
        return -1;

      foreach (Tab tab in Tabs) {
        GraphicsPath path = GetTabOutline(tab, true, false);
        if (path.IsVisible(ptMouse))
          return Tabs.IndexOf(tab);
      }
      return -1;
    }

    protected override void OnMouseHover(EventArgs e) {
      int index = HitTest(PointToClient(Control.MousePosition));
      string toolTip = string.Empty;

      base.OnMouseHover(e);

      if (index != -1) {
        TabVS2005 tab = Tabs[index] as TabVS2005;
        if (!String.IsNullOrEmpty(tab.Content.DockHandler.ToolTipText))
          toolTip = tab.Content.DockHandler.ToolTipText;
        else if (tab.MaxWidth > tab.TabWidth)
          toolTip = tab.Content.DockHandler.TabText;
      }

      if (m_toolTip.GetToolTip(this) != toolTip) {
        m_toolTip.Active = false;
        m_toolTip.SetToolTip(this, toolTip);
        m_toolTip.Active = true;
      }

      // requires further tracking of mouse hover behavior,
      ResetMouseEventArgs();
    }

    protected override void OnRightToLeftChanged(EventArgs e) {
      base.OnRightToLeftChanged(e);
      PerformLayout();
    }
  }
}