source: branches/Persistence Test/WinFormsUI/Docking/Helpers/DockHelper.cs @ 3191

using System;
using System.Drawing;
using System.Windows.Forms;

namespace WeifenLuo.WinFormsUI.Docking
{
  internal static class DockHelper
  {
    public static bool IsDockStateAutoHide(DockState dockState)
    {
      if (dockState == DockState.DockLeftAutoHide ||
        dockState == DockState.DockRightAutoHide ||
        dockState == DockState.DockTopAutoHide ||
        dockState == DockState.DockBottomAutoHide)
        return true;
      else
        return false;
    }

    public static bool IsDockStateValid(DockState dockState, DockAreas dockableAreas)
    {
      if (((dockableAreas & DockAreas.Float) == 0) &&
        (dockState == DockState.Float))
        return false;
      else if (((dockableAreas & DockAreas.Document) == 0) &&
        (dockState == DockState.Document))
        return false;
      else if (((dockableAreas & DockAreas.DockLeft) == 0) &&
        (dockState == DockState.DockLeft || dockState == DockState.DockLeftAutoHide))
        return false;
      else if (((dockableAreas & DockAreas.DockRight) == 0) &&
        (dockState == DockState.DockRight || dockState == DockState.DockRightAutoHide))
        return false;
      else if (((dockableAreas & DockAreas.DockTop) == 0) &&
        (dockState == DockState.DockTop || dockState == DockState.DockTopAutoHide))
        return false;
      else if (((dockableAreas & DockAreas.DockBottom) == 0) &&
        (dockState == DockState.DockBottom || dockState == DockState.DockBottomAutoHide))
        return false;
      else
        return true;
    }

    public static bool IsDockWindowState(DockState state)
    {
      if (state == DockState.DockTop || state == DockState.DockBottom || state == DockState.DockLeft ||
        state == DockState.DockRight || state == DockState.Document)
        return true;
      else
        return false;
    }

    public static DockState ToggleAutoHideState(DockState state)
    {
      if (state == DockState.DockLeft)
        return DockState.DockLeftAutoHide;
      else if (state == DockState.DockRight)
        return DockState.DockRightAutoHide;
      else if (state == DockState.DockTop)
        return DockState.DockTopAutoHide;
      else if (state == DockState.DockBottom)
        return DockState.DockBottomAutoHide;
      else if (state == DockState.DockLeftAutoHide)
        return DockState.DockLeft;
      else if (state == DockState.DockRightAutoHide)
        return DockState.DockRight;
      else if (state == DockState.DockTopAutoHide)
        return DockState.DockTop;
      else if (state == DockState.DockBottomAutoHide)
        return DockState.DockBottom;
      else
        return state;
    }

    public static DockPane PaneAtPoint(Point pt, DockPanel dockPanel)
    {
      for (Control control = Win32Helper.ControlAtPoint(pt); control != null; control = control.Parent)
      {
        IDockContent content = control as IDockContent;
        if (content != null && content.DockHandler.DockPanel == dockPanel)
          return content.DockHandler.Pane;

        DockPane pane = control as DockPane;
        if (pane != null && pane.DockPanel == dockPanel)
          return pane;
      }

      return null;
    }

    public static FloatWindow FloatWindowAtPoint(Point pt, DockPanel dockPanel)
    {
      for (Control control = Win32Helper.ControlAtPoint(pt); control != null; control = control.Parent)
      {
        FloatWindow floatWindow = control as FloatWindow;
        if (floatWindow != null && floatWindow.DockPanel == dockPanel)
          return floatWindow;
      }

      return null;
    }
  }
}