source: branches/WebJobManager/HeuristicLab.ExtLibs/HeuristicLab.WinFormsUI/2.7.0/WinFormsUI-2.7.0/Docking/DockWindow.cs

using System;
using System.Windows.Forms;
using System.Drawing;
using System.Runtime.InteropServices;
using System.ComponentModel;

namespace WeifenLuo.WinFormsUI.Docking
{
  [ToolboxItem(false)]
  public partial class DockWindow : Panel, INestedPanesContainer, ISplitterDragSource
  {
    private DockPanel m_dockPanel;
    private DockState m_dockState;
    private SplitterControl m_splitter;
    private NestedPaneCollection m_nestedPanes;

    internal DockWindow(DockPanel dockPanel, DockState dockState)
    {
      m_nestedPanes = new NestedPaneCollection(this);
      m_dockPanel = dockPanel;
      m_dockState = dockState;
      Visible = false;

      SuspendLayout();

      if (DockState == DockState.DockLeft || DockState == DockState.DockRight ||
        DockState == DockState.DockTop || DockState == DockState.DockBottom)
      {
        m_splitter = new SplitterControl();
        Controls.Add(m_splitter);
      }

      if (DockState == DockState.DockLeft)
      {
        Dock = DockStyle.Left;
        m_splitter.Dock = DockStyle.Right;
      }
      else if (DockState == DockState.DockRight)
      {
        Dock = DockStyle.Right;
        m_splitter.Dock = DockStyle.Left;
      }
      else if (DockState == DockState.DockTop)
      {
        Dock = DockStyle.Top;
        m_splitter.Dock = DockStyle.Bottom;
      }
      else if (DockState == DockState.DockBottom)
      {
        Dock = DockStyle.Bottom;
        m_splitter.Dock = DockStyle.Top;
      }
      else if (DockState == DockState.Document)
      {
        Dock = DockStyle.Fill;
      }

      ResumeLayout();
    }

    public VisibleNestedPaneCollection VisibleNestedPanes
    {
      get { return NestedPanes.VisibleNestedPanes;  }
    }

    public NestedPaneCollection NestedPanes
    {
      get { return m_nestedPanes; }
    }

    public DockPanel DockPanel
    {
      get { return m_dockPanel; }
    }

    public DockState DockState
    {
      get { return m_dockState; }
    }

    public bool IsFloat
    {
      get { return DockState == DockState.Float;  }
    }

    internal DockPane DefaultPane
    {
      get { return VisibleNestedPanes.Count == 0 ? null : VisibleNestedPanes[0];  }
    }

    public virtual Rectangle DisplayingRectangle
    {
      get
      {
        Rectangle rect = ClientRectangle;
        // if DockWindow is document, exclude the border
        if (DockState == DockState.Document)
        {
          rect.X += 1;
          rect.Y += 1;
          rect.Width -= 2;
          rect.Height -= 2;
        }
        // exclude the splitter
        else if (DockState == DockState.DockLeft)
          rect.Width -= Measures.SplitterSize;
        else if (DockState == DockState.DockRight)
        {
          rect.X += Measures.SplitterSize;
          rect.Width -= Measures.SplitterSize;
        }
        else if (DockState == DockState.DockTop)
          rect.Height -= Measures.SplitterSize;
        else if (DockState == DockState.DockBottom)
        {
          rect.Y += Measures.SplitterSize;
          rect.Height -= Measures.SplitterSize;
        }

        return rect;
      }
    }

    protected override void OnPaint(PaintEventArgs e)
    {
      // if DockWindow is document, draw the border
            if (DockState == DockState.Document)
                e.Graphics.DrawRectangle(SystemPens.ControlDark, ClientRectangle.X, ClientRectangle.Y, ClientRectangle.Width - 1, ClientRectangle.Height - 1);

      base.OnPaint(e);
    }

    protected override void OnLayout(LayoutEventArgs levent)
    {
      VisibleNestedPanes.Refresh();
      if (VisibleNestedPanes.Count == 0)
      {
                if (Visible)
                    Visible = false;
      }
      else if (!Visible)
      {
        Visible = true;
        VisibleNestedPanes.Refresh();
      }

      base.OnLayout (levent);
    }

        #region ISplitterDragSource Members

        void ISplitterDragSource.BeginDrag(Rectangle rectSplitter)
        {
        }

        void ISplitterDragSource.EndDrag()
        {
        }

        bool ISplitterDragSource.IsVertical
        {
            get { return (DockState == DockState.DockLeft || DockState == DockState.DockRight); }
        }

        Rectangle ISplitterDragSource.DragLimitBounds
        {
            get
            {
                Rectangle rectLimit = DockPanel.DockArea;
                Point location;
                if ((Control.ModifierKeys & Keys.Shift) == 0)
                    location = Location;
                else
                    location = DockPanel.DockArea.Location;

                if (((ISplitterDragSource)this).IsVertical)
                {
                    rectLimit.X += MeasurePane.MinSize;
                    rectLimit.Width -= 2 * MeasurePane.MinSize;
                    rectLimit.Y = location.Y;
                    if ((Control.ModifierKeys & Keys.Shift) == 0)
                        rectLimit.Height = Height;
                }
                else
                {
                    rectLimit.Y += MeasurePane.MinSize;
                    rectLimit.Height -= 2 * MeasurePane.MinSize;
                    rectLimit.X = location.X;
                    if ((Control.ModifierKeys & Keys.Shift) == 0)
                        rectLimit.Width = Width;
                }

                return DockPanel.RectangleToScreen(rectLimit);
            }
        }

        void ISplitterDragSource.MoveSplitter(int offset)
        {
            if ((Control.ModifierKeys & Keys.Shift) != 0)
                SendToBack();

            Rectangle rectDockArea = DockPanel.DockArea;
            if (DockState == DockState.DockLeft && rectDockArea.Width > 0)
            {
                if (DockPanel.DockLeftPortion > 1)
                    DockPanel.DockLeftPortion = Width + offset;
                else
                    DockPanel.DockLeftPortion += ((double)offset) / (double)rectDockArea.Width;
            }
            else if (DockState == DockState.DockRight && rectDockArea.Width > 0)
            {
                if (DockPanel.DockRightPortion > 1)
                    DockPanel.DockRightPortion = Width - offset;
                else
                    DockPanel.DockRightPortion -= ((double)offset) / (double)rectDockArea.Width;
            }
            else if (DockState == DockState.DockBottom && rectDockArea.Height > 0)
            {
                if (DockPanel.DockBottomPortion > 1)
                    DockPanel.DockBottomPortion = Height - offset;
                else
                    DockPanel.DockBottomPortion -= ((double)offset) / (double)rectDockArea.Height;
            }
            else if (DockState == DockState.DockTop && rectDockArea.Height > 0)
            {
                if (DockPanel.DockTopPortion > 1)
                    DockPanel.DockTopPortion = Height + offset;
                else
                    DockPanel.DockTopPortion += ((double)offset) / (double)rectDockArea.Height;
            }
        }

        #region IDragSource Members

        Control IDragSource.DragControl
        {
            get { return this; }
        }

        #endregion
        #endregion
    }
}