source: trunk/sources/WinFormsUI/Docking/VS2005AutoHideStrip.cs @ 2498

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

namespace WeifenLuo.WinFormsUI.Docking
{
  internal class VS2005AutoHideStrip : AutoHideStripBase
  {
        private class TabVS2005 : Tab
        {
            internal TabVS2005(IDockContent content)
                : base(content)
            {
            }

            private int m_tabX = 0;
            public int TabX
            {
                get { return m_tabX; }
                set { m_tabX = value; }
            }

            private int m_tabWidth = 0;
            public int TabWidth
            {
                get { return m_tabWidth; }
                set { m_tabWidth = value; }
            }

        }

    private const int _ImageHeight = 16;
    private const int _ImageWidth = 16;
    private const int _ImageGapTop = 2;
    private const int _ImageGapLeft = 4;
    private const int _ImageGapRight = 2;
    private const int _ImageGapBottom = 2;
    private const int _TextGapLeft = 0;
    private const int _TextGapRight = 0;
    private const int _TabGapTop = 3;
    private const int _TabGapLeft = 4;
    private const int _TabGapBetween = 10;

    #region Customizable Properties
        private static Font TextFont
        {
            get { return SystemInformation.MenuFont; }
        }

    private static StringFormat _stringFormatTabHorizontal;
    private StringFormat StringFormatTabHorizontal
    {
      get
      {
        if (_stringFormatTabHorizontal == null)
        {
          _stringFormatTabHorizontal = new StringFormat();
          _stringFormatTabHorizontal.Alignment = StringAlignment.Near;
          _stringFormatTabHorizontal.LineAlignment = StringAlignment.Center;
          _stringFormatTabHorizontal.FormatFlags = StringFormatFlags.NoWrap;
            _stringFormatTabHorizontal.Trimming = StringTrimming.None;
        }

                if (RightToLeft == RightToLeft.Yes)
                    _stringFormatTabHorizontal.FormatFlags |= StringFormatFlags.DirectionRightToLeft;
                else
                    _stringFormatTabHorizontal.FormatFlags &= ~StringFormatFlags.DirectionRightToLeft;

        return _stringFormatTabHorizontal;
      }
    }

    private static StringFormat _stringFormatTabVertical;
    private StringFormat StringFormatTabVertical
    {
      get
      { 
        if (_stringFormatTabVertical == null)
        {
          _stringFormatTabVertical = new StringFormat();
          _stringFormatTabVertical.Alignment = StringAlignment.Near;
          _stringFormatTabVertical.LineAlignment = StringAlignment.Center;
          _stringFormatTabVertical.FormatFlags = StringFormatFlags.NoWrap | StringFormatFlags.DirectionVertical;
            _stringFormatTabVertical.Trimming = StringTrimming.None;
        }
                if (RightToLeft == RightToLeft.Yes)
                    _stringFormatTabVertical.FormatFlags |= StringFormatFlags.DirectionRightToLeft;
                else
                    _stringFormatTabVertical.FormatFlags &= ~StringFormatFlags.DirectionRightToLeft;

                return _stringFormatTabVertical;
      }
    }

    private static int ImageHeight
    {
      get { return _ImageHeight;  }
    }

    private static int ImageWidth
    {
      get { return _ImageWidth; }
    }

    private static int ImageGapTop
    {
      get { return _ImageGapTop;  }
    }

    private static int ImageGapLeft
    {
      get { return _ImageGapLeft; }
    }

    private static int ImageGapRight
    {
      get { return _ImageGapRight;  }
    }

    private static int ImageGapBottom
    {
      get { return _ImageGapBottom; }
    }

    private static int TextGapLeft
    {
      get { return _TextGapLeft;  }
    }

    private static int TextGapRight
    {
      get { return _TextGapRight; }
    }

    private static int TabGapTop
    {
      get { return _TabGapTop;  }
    }

    private static int TabGapLeft
    {
      get { return _TabGapLeft; }
    }

    private static int TabGapBetween
    {
      get { return _TabGapBetween;  }
    }

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

        private static Matrix _matrixIdentity = new Matrix();
        private static Matrix MatrixIdentity
    {
            get { return _matrixIdentity; }
    }

        private static DockState[] _dockStates;
        private static DockState[] DockStates
    {
      get
            {
                if (_dockStates == null)
                {
                    _dockStates = new DockState[4];
                    _dockStates[0] = DockState.DockLeftAutoHide;
                    _dockStates[1] = DockState.DockRightAutoHide;
                    _dockStates[2] = DockState.DockTopAutoHide;
                    _dockStates[3] = DockState.DockBottomAutoHide;
                }
                return _dockStates;
            }
    }

        private static GraphicsPath _graphicsPath;
        internal static GraphicsPath GraphicsPath
        {
            get
            {
                if (_graphicsPath == null)
                    _graphicsPath = new GraphicsPath();

                return _graphicsPath;
            }
        }

    public VS2005AutoHideStrip(DockPanel panel) : base(panel)
    {
      SetStyle(ControlStyles.ResizeRedraw | 
                ControlStyles.UserPaint |
                ControlStyles.AllPaintingInWmPaint |
                ControlStyles.OptimizedDoubleBuffer, true);
            BackColor = SystemColors.ControlLight;
    }

    protected override void OnPaint(PaintEventArgs e)
    {
      Graphics g = e.Graphics;
            
            Color startColor = DockPanel.Skin.AutoHideStripSkin.DockStripGradient.StartColor;
            Color endColor = DockPanel.Skin.AutoHideStripSkin.DockStripGradient.EndColor;
            LinearGradientMode gradientMode = DockPanel.Skin.AutoHideStripSkin.DockStripGradient.LinearGradientMode;
            using (LinearGradientBrush brush = new LinearGradientBrush(ClientRectangle, startColor, endColor, gradientMode))
            {
                g.FillRectangle(brush, ClientRectangle);
            }
      
            DrawTabStrip(g);
    }

    protected override void OnLayout(LayoutEventArgs levent)
    {
      CalculateTabs();
      base.OnLayout (levent);
    }

    private void DrawTabStrip(Graphics g)
    {
      DrawTabStrip(g, DockState.DockTopAutoHide);
      DrawTabStrip(g, DockState.DockBottomAutoHide);
      DrawTabStrip(g, DockState.DockLeftAutoHide);
      DrawTabStrip(g, DockState.DockRightAutoHide);
    }

    private void DrawTabStrip(Graphics g, DockState dockState)
    {
      Rectangle rectTabStrip = GetLogicalTabStripRectangle(dockState);

      if (rectTabStrip.IsEmpty)
        return;

            Matrix matrixIdentity = g.Transform;
            if (dockState == DockState.DockLeftAutoHide || dockState == DockState.DockRightAutoHide)
      {
        Matrix matrixRotated = new Matrix();
        matrixRotated.RotateAt(90, new PointF((float)rectTabStrip.X + (float)rectTabStrip.Height / 2,
          (float)rectTabStrip.Y + (float)rectTabStrip.Height / 2));
        g.Transform = matrixRotated;
      }

      foreach (Pane pane in GetPanes(dockState))
      {
        foreach (TabVS2005 tab in pane.AutoHideTabs)
          DrawTab(g, tab);
      }
      g.Transform = matrixIdentity;
    }

    private void CalculateTabs()
    {
      CalculateTabs(DockState.DockTopAutoHide);
      CalculateTabs(DockState.DockBottomAutoHide);
      CalculateTabs(DockState.DockLeftAutoHide);
      CalculateTabs(DockState.DockRightAutoHide);
    }

        private void CalculateTabs(DockState dockState)
        {
            Rectangle rectTabStrip = GetLogicalTabStripRectangle(dockState);

            int imageHeight = rectTabStrip.Height - ImageGapTop - ImageGapBottom;
            int imageWidth = ImageWidth;
            if (imageHeight > ImageHeight)
                imageWidth = ImageWidth * (imageHeight / ImageHeight);

            int x = TabGapLeft + rectTabStrip.X;
            foreach (Pane pane in GetPanes(dockState))
            {
                foreach (TabVS2005 tab in pane.AutoHideTabs)
                {
                    int width = imageWidth + ImageGapLeft + ImageGapRight +
                        TextRenderer.MeasureText(tab.Content.DockHandler.TabText, TextFont).Width +
                        TextGapLeft + TextGapRight;
                    tab.TabX = x;
                    tab.TabWidth = width;
                    x += width;
                }

                x += TabGapBetween;
            }
        }

        private Rectangle RtlTransform(Rectangle rect, DockState dockState)
        {
            Rectangle rectTransformed;
            if (dockState == DockState.DockLeftAutoHide || dockState == DockState.DockRightAutoHide)
                rectTransformed = rect;
            else
                rectTransformed = DrawHelper.RtlTransform(this, rect);

            return rectTransformed;
        }

        private GraphicsPath GetTabOutline(TabVS2005 tab, bool transformed, bool rtlTransform)
        {
            DockState dockState = tab.Content.DockHandler.DockState;
            Rectangle rectTab = GetTabRectangle(tab, transformed);
            if (rtlTransform)
                rectTab = RtlTransform(rectTab, dockState);
            bool upTab = (dockState == DockState.DockLeftAutoHide || dockState == DockState.DockBottomAutoHide);
            DrawHelper.GetRoundedCornerTab(GraphicsPath, rectTab, upTab);

            return GraphicsPath;
        }

    private void DrawTab(Graphics g, TabVS2005 tab)
    {
      Rectangle rectTabOrigin = GetTabRectangle(tab);
      if (rectTabOrigin.IsEmpty)
        return;

      DockState dockState = tab.Content.DockHandler.DockState;
      IDockContent content = tab.Content;

            GraphicsPath path = GetTabOutline(tab, false, true);

            Color startColor = DockPanel.Skin.AutoHideStripSkin.TabGradient.StartColor;
            Color endColor = DockPanel.Skin.AutoHideStripSkin.TabGradient.EndColor;
            LinearGradientMode gradientMode = DockPanel.Skin.AutoHideStripSkin.TabGradient.LinearGradientMode;
            g.FillPath(new LinearGradientBrush(rectTabOrigin, startColor, endColor, gradientMode), path);
            g.DrawPath(PenTabBorder, path);

            // Set no rotate for drawing icon and text
      Matrix matrixRotate = g.Transform;
      g.Transform = MatrixIdentity;

      // Draw the icon
      Rectangle rectImage = rectTabOrigin;
      rectImage.X += ImageGapLeft;
      rectImage.Y += ImageGapTop;
      int imageHeight = rectTabOrigin.Height - ImageGapTop - ImageGapBottom;
      int imageWidth = ImageWidth;
      if (imageHeight > ImageHeight)
        imageWidth = ImageWidth * (imageHeight/ImageHeight);
      rectImage.Height = imageHeight;
      rectImage.Width = imageWidth;
      rectImage = GetTransformedRectangle(dockState, rectImage);
      g.DrawIcon(((Form)content).Icon, RtlTransform(rectImage, dockState));

      // Draw the text
      Rectangle rectText = rectTabOrigin;
      rectText.X += ImageGapLeft + imageWidth + ImageGapRight + TextGapLeft;
      rectText.Width -= ImageGapLeft + imageWidth + ImageGapRight + TextGapLeft;
      rectText = RtlTransform(GetTransformedRectangle(dockState, rectText), dockState);

            Color textColor = DockPanel.Skin.AutoHideStripSkin.TabGradient.TextColor;
            
      if (dockState == DockState.DockLeftAutoHide || dockState == DockState.DockRightAutoHide)
        g.DrawString(content.DockHandler.TabText, TextFont, new SolidBrush(textColor), rectText, StringFormatTabVertical);
      else
                g.DrawString(content.DockHandler.TabText, TextFont, new SolidBrush(textColor), rectText, StringFormatTabHorizontal);

      // Set rotate back
      g.Transform = matrixRotate;
    }

    private Rectangle GetLogicalTabStripRectangle(DockState dockState)
    {
      return GetLogicalTabStripRectangle(dockState, false);
    }

    private Rectangle GetLogicalTabStripRectangle(DockState dockState, bool transformed)
    {
      if (!DockHelper.IsDockStateAutoHide(dockState))
        return Rectangle.Empty;

      int leftPanes = GetPanes(DockState.DockLeftAutoHide).Count;
      int rightPanes = GetPanes(DockState.DockRightAutoHide).Count;
      int topPanes = GetPanes(DockState.DockTopAutoHide).Count;
      int bottomPanes = GetPanes(DockState.DockBottomAutoHide).Count;

      int x, y, width, height;

      height = MeasureHeight();
      if (dockState == DockState.DockLeftAutoHide && leftPanes > 0)
      {
        x = 0;
        y = (topPanes == 0) ? 0 : height;
        width = Height - (topPanes == 0 ? 0 : height) - (bottomPanes == 0 ? 0 :height);
      }
      else if (dockState == DockState.DockRightAutoHide && rightPanes > 0)
      {
        x = Width - height;
        if (leftPanes != 0 && x < height)
          x = height;
        y = (topPanes == 0) ? 0 : height;
        width = Height - (topPanes == 0 ? 0 : height) - (bottomPanes == 0 ? 0 :height);
      }
      else if (dockState == DockState.DockTopAutoHide && topPanes > 0)
      {
        x = leftPanes == 0 ? 0 : height;
        y = 0;
        width = Width - (leftPanes == 0 ? 0 : height) - (rightPanes == 0 ? 0 : height);
      }
      else if (dockState == DockState.DockBottomAutoHide && bottomPanes > 0)
      {
        x = leftPanes == 0 ? 0 : height;
        y = Height - height;
        if (topPanes != 0 && y < height)
          y = height;
        width = Width - (leftPanes == 0 ? 0 : height) - (rightPanes == 0 ? 0 : height);
      }
      else
        return Rectangle.Empty;

      if (!transformed)
        return new Rectangle(x, y, width, height);
      else
        return GetTransformedRectangle(dockState, new Rectangle(x, y, width, height));
    }

    private Rectangle GetTabRectangle(TabVS2005 tab)
    {
      return GetTabRectangle(tab, false);
    }

    private Rectangle GetTabRectangle(TabVS2005 tab, bool transformed)
    {
      DockState dockState = tab.Content.DockHandler.DockState;
      Rectangle rectTabStrip = GetLogicalTabStripRectangle(dockState);

      if (rectTabStrip.IsEmpty)
        return Rectangle.Empty;

      int x = tab.TabX;
      int y = rectTabStrip.Y + 
        (dockState == DockState.DockTopAutoHide || dockState == DockState.DockRightAutoHide ?
        0 : TabGapTop);
      int width = tab.TabWidth;
      int height = rectTabStrip.Height - TabGapTop;

      if (!transformed)
        return new Rectangle(x, y, width, height);
      else
        return GetTransformedRectangle(dockState, new Rectangle(x, y, width, height));
    }

    private Rectangle GetTransformedRectangle(DockState dockState, Rectangle rect)
    {
      if (dockState != DockState.DockLeftAutoHide && dockState != DockState.DockRightAutoHide)
        return rect;

      PointF[] pts = new PointF[1];
      // the center of the rectangle
      pts[0].X = (float)rect.X + (float)rect.Width / 2;
      pts[0].Y = (float)rect.Y + (float)rect.Height / 2;
      Rectangle rectTabStrip = GetLogicalTabStripRectangle(dockState);
      Matrix matrix = new Matrix();
      matrix.RotateAt(90, new PointF((float)rectTabStrip.X + (float)rectTabStrip.Height / 2,
        (float)rectTabStrip.Y + (float)rectTabStrip.Height / 2));
      matrix.TransformPoints(pts);

      return new Rectangle((int)(pts[0].X - (float)rect.Height / 2 + .5F),
        (int)(pts[0].Y - (float)rect.Width / 2 + .5F),
        rect.Height, rect.Width);
    }

    protected override IDockContent HitTest(Point ptMouse)
    {
      foreach(DockState state in DockStates)
      {
        Rectangle rectTabStrip = GetLogicalTabStripRectangle(state, true);
        if (!rectTabStrip.Contains(ptMouse))
          continue;

        foreach(Pane pane in GetPanes(state))
        {
                    DockState dockState = pane.DockPane.DockState;
          foreach(TabVS2005 tab in pane.AutoHideTabs)
          {
                        GraphicsPath path = GetTabOutline(tab, true, true);
                        if (path.IsVisible(ptMouse))
              return tab.Content;
          }
        }
      }
      
      return null;
    }

    protected internal override int MeasureHeight()
    {
      return Math.Max(ImageGapBottom +
        ImageGapTop + ImageHeight,
        TextFont.Height) + TabGapTop;
    }

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

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