using System;
using System.Collections;
using System.Collections.Generic;
using System.ComponentModel;
using System.Drawing;
using System.Data;
using System.Text;
using System.Windows.Forms;
using System.Text.RegularExpressions;
using AT.STO.UI.Win;
using VEPROMS.CSLA.Library;

namespace Volian.Controls.Library
{
	public partial class DisplayTransition : UserControl
	{
		#region Properties
		private int _TranFmtIndx = -1;		// stores selected transition format
		private ItemInfo _CurItemFrom;		// stores what item transition is 'from'
		private TransitionInfo _CurTrans;	// if modify, this is transition to modify
		public TransitionInfo CurTrans
		{
			get { return _CurTrans; }
			set 
			{
				if (!Visible) return;
				if (value == null)			// Insert a transition
				{
					if (MyRTB == null) return;
					if (_CurTrans == value && _CurItemFrom == MyRTB.MyItemInfo) return;
					_CurItemFrom = MyRTB.MyItemInfo;
					_TranFmtIndx = 0;
				}
				else						// Modify a transition
				{
					if (_CurTrans == value) return;
					_TranFmtIndx = value.TranType;
					_CurItemFrom = MyRTB.MyItemInfo;
				}
				_CurTrans = value;
				_SavCurItemFrom = _CurItemFrom;
				_SavTranFmtIndx = _TranFmtIndx;
				TransitionFillIn();
			}
		}
		// use the following if user selects 'cancel' button
		private ItemInfo _SavCurItemFrom;
		private int _SavTranFmtIndx;

		private bool _DoingRange = false;	// flags if in 'range' transition mode
		private VETreeNode _RangeNode1;
		private VETreeNode _RangeNode2;
		// Use _RangeColor to show highlighting for steps selected in range. This is set from 
		// calling methods from application settings. If not default to aquamarine.
		private Color _RangeColor = Color.LightGreen;
		public Color RangeColor
		{
			get { return _RangeColor; }
			set { _RangeColor = value; }
		}
		private StepRTB _MyRTB;			// Current MyDisplayRTB, i.e. insert transition to it.
		public StepRTB MyRTB
		{
			get { return _MyRTB; }
			set 
			{
				if (!Visible) return;
				// add or remove events for 
				if (_MyRTB != null)		
					_MyRTB.LinkChanged -= new StepRTBLinkEvent(_MyRTB_LinkChanged);
				if (value == null) return;
				_MyRTB = value;
				_MyRTB.LinkChanged += new StepRTBLinkEvent(_MyRTB_LinkChanged);
				if (_MyRTB.MyLinkText == null)
				{
					CurTrans = null;
				}
			}
		}
		void _MyRTB_LinkChanged(object sender, StepPanelLinkEventArgs args)
		{
			//if (_MyRTB.MyLinkText == null)
			//  CurTrans = null;
			//else
			//{
			//  StepPanelLinkEventArgs tmp = new StepPanelLinkEventArgs(null, e);
				CurTrans = args.MyLinkText.MyTransitionInfo;
			//}
		}
		private ItemInfo _CurrentItemProcedure;		// the selected item's procedure
		private ItemInfo _CurrentToProcedure;		// the 'to' location's procedure (may be same as _CurrentItemProcedure)
		private ItemInfo _CurrentProcedure;			// current procedure used to set all of the controls (may switch between above two)
		private int _CurrentProcIndex;
		private bool _AlwaysDisableSets;	// true if there is only 1 item in tree/combo for sets
		private Color _OrigGroupPanelSets;
		private Color _OrigGroupPanelProcs;
		private Color _OrigGroupPanelSects;
		private Color _OrigGroupPanelSteps;
		#endregion
		#region Constructors
		public DisplayTransition()
		{
			InitializeComponent();
		}
		#endregion
		#region LoadControlData
		// TransitionFillIn uses other methods to fill in all controls on the transition tab.  
		private bool _InitializingTrans;
		private void TransitionFillIn()
		{
			_InitializingTrans = true;
			if (_RangeNode1 != null || _RangeNode2 != null) ClearRangeTransition();
			InitControls();
			_InitializingTrans = false;
		}
		private void InitControls()
		{
			_OrigGroupPanelSets = groupPanelTransitionSets.Style.BackColor;
			_OrigGroupPanelProcs = groupPanelTransitionProcs.Style.BackColor;
			_OrigGroupPanelSects = groupPanelTransitionSect.Style.BackColor;
			_OrigGroupPanelSteps = groupPanelTranstionSteps.Style.BackColor;

			ListBoxTranFmtFillIn();

			// if new, use _CurItemFrom to setup the initial selections in the controls,
			// if modify, use the first transition to, _CurTrans
			// This item will be either a procedure, section or step, never a docversion
			ItemInfo selitm = _CurTrans==null?_CurItemFrom:_CurTrans.MyItemToID;
			// If this points to an invalid transtion, make it point to itself.
			if (selitm.PreviousID == null && selitm.ItemPartCount == 0 && selitm.ItemDocVersionCount == 0)
			{
				selitm = _CurItemFrom;
			}
			ItemInfo tmpitm = selitm;
			ItemInfo secitm = null;

			// Find the procedure level first.
			while (tmpitm.MyContent.Type != 0)
			{
				if (tmpitm.MyContent.Type >=10000 && tmpitm.MyContent.Type<20000) secitm = tmpitm;
				tmpitm = tmpitm.MyParent;
			}
			_CurrentProcedure = tmpitm;
			_CurrentToProcedure = _CurrentProcedure;
			if (_CurTrans == null)
				_CurrentItemProcedure = _CurrentProcedure;
			else
			{
				// use the transition from to get the procedure 'from'....
				ItemInfo curfrom = _CurItemFrom;
				while (curfrom.MyContent.Type != 0) curfrom = curfrom.MyParent;
				_CurrentItemProcedure = curfrom;
			}
			// set other procedure related private variables.  
			vlnTreeComboSetsFillIn(_CurrentProcedure);
			cbTranProcsFillIn(_CurrentProcedure);
			if (_CurrentProcedure.Sections != null)
			{
				cbTranSectsFillIn(secitm, secitm == null ? -1 : secitm.ItemID);

				// Fill step items, passing in the active step to the selected item, or the first
				// step if the selection was not at the step level.
				ItemInfo stpitm = null;
				ItemInfo rngitm = null;
				bool rangeSameLevel = true;
				int i1 = 0;
				int i2 = 0;
				if (selitm.MyContent.Type >= 20000)
				{
					// if this is a range, find the 'outermost' range step, i.e. the highest level 
					// in the tree.
					if (_DoingRange)
					{
						ItemInfo itm1 = selitm;
						ItemInfo itm2 = _CurTrans.MyItemRangeID;
						while (!itm1.IsHigh)
						{
							i1++;
							itm1 = itm1.MyParent;
						}
						while (!itm2.IsHigh)
						{
							i2++;
							itm2 = itm2.MyParent;
						}
						
						if (i1 != i2) rangeSameLevel = false;
						stpitm = (i1 <= i2) ? selitm : _CurTrans.MyItemRangeID;
						rngitm = (stpitm == selitm) ? _CurTrans.MyItemRangeID : selitm;
					}
					else
						stpitm = selitm;
				}
				else if (secitm != null && secitm.Steps != null && secitm.Steps.Count > 0)
					stpitm = selitm.Steps[0];
				tvTranFillIn(stpitm);
				if (_DoingRange) tvInitHiliteRange(rangeSameLevel, stpitm, rngitm, (i1 < i2) ? i2 : i1);
			}
			else
			{
				cbTranSects.Items.Clear();
				tvTran.Nodes.Clear();
			}

			SetControlsEnabling();
		}
		private void tvInitHiliteRange(bool rangeSameLevel, ItemInfo stpitm, ItemInfo rngitm, int uplevel)
		{
			_RangeNode1 = _CurTrans != null ? (VETreeNode)tvTran.SelectedNode : null;
			_RangeNode2 = null;
			// get first treenode at this level
			VETreeNode tn = (VETreeNode)tvTran.Nodes[0];

			if (rangeSameLevel)
			{
				// look at all children looking for the 'rngitm'.
				while (_RangeNode2 == null)
				{
					ItemInfo ii = (ItemInfo)tn.VEObject;
					if (ii.ItemID == rngitm.ItemID) _RangeNode2 = tn;
					tn = (VETreeNode)tn.NextNode;
				}
			}
			else
			{
				// Node that is outermost in tree between the two range items is 'stpitm', so need to expand tree from 
				// 'rngitm's parents down to rngitm.  Make a list with the path from the range item to the selected item.
				List<ItemInfo> path = new List<ItemInfo>();
				ItemInfo parRng = rngitm;
				for (int i = 0; i < uplevel+1; i++)
				{
					path.Insert(i, parRng);
					parRng = (ItemInfo)parRng.ActiveParent;
				}

				// find each node to expand in the tree. look at all children looking for the items in the path list
				
				VETreeNode tnExpand = null;
				while (tnExpand == null && tn != null)
				{
					ItemInfo ii = (ItemInfo)tn.VEObject;
					if (ii.ItemID == path[uplevel].ItemID) tnExpand = tn;
					tn = (VETreeNode)tn.NextNode;
				}
				if (tnExpand == null)
				{
					MessageBox.Show("Error in highlighting step range.");
					return;
				}
				VETreeNode tmp = null;
				// Expand levels of subtree until second node in range.
				for (int i = uplevel-1; i >= 0; i--)
				{
					tnExpand.Expand();
					foreach (VETreeNode ctn in tnExpand.Nodes)
					{
						ItemInfo ii = (ItemInfo)ctn.VEObject;
						if (ii.ItemID == path[i].ItemID)
						{
							tmp = ctn;
							if (i == 0) _RangeNode2 = tmp;
						}
					}
					tnExpand = tmp;
				}
			}
			tvTranRangeHilites(true, _RangeNode1, _RangeNode2);
		}
		private void vlnTreeComboSetsFillIn(ItemInfo prcitm)
		{
			// from this procedure, walk up the tree storing the FolderInfos.  This is done
			// so that the tree can be expanded highlighting (selecting) the current set.
			List<FolderInfo> filist = new List<FolderInfo>();
			DocVersionInfo mydocversion = prcitm.ActiveParent as DocVersionInfo;
			FolderInfo tmpfi = mydocversion.ActiveParent as FolderInfo;
			while (tmpfi != null)
			{
				if (tmpfi.FolderID != 1) filist.Add(tmpfi);  // don't add top folder
				tmpfi = tmpfi.ActiveParent as FolderInfo;
			}

			// Now start at the top folder. Continue to get children using the filist to determine
			// the expanded part of the tree. Note that if there is only 1 item at a level,
			// the level is not added to the tree, except if there are no sub-folders, i.e.
			// right before the docversion. Also note that docversions are not displayed
			// (at least for now - as of 2/14/08), this may change and if so uncomment (& fix/test)
			// the next section of code where docversions are processed.
			FolderInfo fi = FolderInfo.GetTop();
			DropDownNode topnode = null;
			int cntnd = 0;
			while (fi.ChildFolderCount > 0)
			{
				// if there is more than 1 child, add this level of children to the
				// to the tree.  The second part of the 'if' covers the last level of
				// folder.
				if ((fi.ChildFolders.Count > 1) || 
					(fi.ChildFolders.Count==1 && fi.ChildFolders[0].FolderDocVersionCount>0))
				{
					int indx = -1;
					int pathid = filist[filist.Count - 1].FolderID;
					foreach (FolderInfo fic in fi.ChildFolders)
					{
						DropDownNode newnode = new DropDownNode(fic.FolderID, fic.ToString());
						int	tmp = topnode==null?vlnTreeComboSets.DropDownControl.Nodes.Add(newnode):topnode.Nodes.Add(newnode);
						cntnd++;
						newnode.Tag = fic;
						if (fic.FolderID == pathid)
							indx = tmp;		// flag the path to expand.
						else if (fic.ChildFolderCount > 0)		// allow for '+' for tree expansion
						{
							DropDownNode tnt = new DropDownNode(0, "VLN_DUMMY");
							newnode.Nodes.Add(tnt);
						}
					}
					topnode = topnode==null?(DropDownNode)vlnTreeComboSets.DropDownControl.Nodes[indx]:(DropDownNode)topnode.Nodes[indx];
				}
				fi = (filist.Count > 0) ? FolderInfo.Get(filist[filist.Count - 1].FolderID) : null;
				if (filist.Count > 0) filist.RemoveAt(filist.Count - 1);
			}
			// if nothing was added to the tree, just put in the node above the docversions...
			if (vlnTreeComboSets.DropDownControl.Nodes.Count == 0)
			{
				cntnd++;
				fi = mydocversion.MyFolder;
				topnode = new DropDownNode(fi.FolderID, fi.ToString());
				vlnTreeComboSets.DropDownControl.Nodes.Add(topnode);
				topnode.Tag = fi;
			}
			// if there is only one node in entire tree, disable selection...
			if (cntnd == 1) _AlwaysDisableSets = true;
			else _AlwaysDisableSets = false;

			// the following selects the set & displays its value in the combo box portion
			// of the tree combo control.
			vlnTreeComboSets.Value = topnode;
			vlnTreeComboSets.DropDownControl.SelectedNode = topnode;
			vlnTreeComboSets.DropDownControl.BeforeExpand += new TreeViewCancelEventHandler(vlnTreeComboSets_BeforeExpand);

			#region CheckIfNeeded Commented Out
			//vlnTreeComboSets.DropDownControl. = vlnTreeComboSets.Width;
			// The DropDownNode should be at a DocVersion now. The expanded DocVersion
			// is the one that matches mydocversion
			//tmpfi = mydocversion.ActiveParent as FolderInfo;
			//DocVersionInfoList dvlist = tmpfi.FolderDocVersions;
			//DropDownNode tnDV = null;
			// Once at a docversions, only allow working
			// draft sets. Use DocVersion that we're in, to expand it showing the active procedure.
			// first count how many versions can be displayed, i.e. only workingdraft?
			// if more than one, put out a tree node for them.
			//int cntdocv = 0;
			//foreach (DocVersionInfo dv in dvlist)
			//{
			//    if ((VersionTypeEnum)dv.VersionType == VersionTypeEnum.WorkingDraft) cntdocv++;

			//}
			//if (cntdocv>1)
			//{
			//    foreach (DocVersionInfo dv in dvlist)
			//    {
			//        if ((VersionTypeEnum)dv.VersionType == VersionTypeEnum.WorkingDraft)
			//        {
			//            DropDownNode tn = new DropDownNode(dv.VersionID, dv.ToString());
			//            tn.Tag = dv;
			//            if (topnode != null)
			//                topnode.Nodes.Add(tn);
			//            else
			//                vlnTreeComboSets.DropDownControl.Nodes.Add(tn);
			//            if (dv.VersionID == mydocversion.VersionID)
			//            {
			//                tnDV = tn;
			//                vlnTreeComboSets.Value = tnDV;
			//                vlnTreeComboSets.DropDownControl.SelectedNode = tnDV;

			//            }
			//            //else if (dv.HasChildren)		// allow for '+' for tree expansion
			//            //{
			//            //    DropDownNode tnt = new DropDownNode(0,"VLN_DUMMY");
			//            //    tn.Nodes.Add(tnt);
			//            //}
			//        }
			//    }
			//}
			#endregion
		}
		private void ListBoxTranFmtFillIn()
		{
			TransTypeList ttl = _CurItemFrom.ActiveFormat.PlantFormat.FormatData.TransData.TransTypeList;
			listBoxTranFmt.Items.Clear();
			for (int i = 0; i < ttl.Count; i++)
				listBoxTranFmt.Items.Add(ttl[i].TransFormat.Replace("?.",""));
			listBoxTranFmt.SelectedIndex = _TranFmtIndx;
			groupPanelTranFmt.Style.BackColor = (_CurTrans == null && _TranFmtIndx==0) ? Color.Yellow : Color.Orange;
			E_TransUI etm = (E_TransUI)_CurItemFrom.ActiveFormat.PlantFormat.FormatData.TransData.TransTypeList[_TranFmtIndx].TransUI;
			_DoingRange = (etm & E_TransUI.StepLast) == E_TransUI.StepLast;
		}
		private void tvTranFillIn(ItemInfo startitm)
		{
			tvTran.Nodes.Clear();
			groupPanelTranstionSteps.Style.BackColor = _OrigGroupPanelSteps;
			if (startitm == null) return;
			// if the transition to point is a section or procedure, just return
			if (startitm.MyContent.Type < 20000) return;

			groupPanelTranstionSteps.Style.BackColor = Color.Cornsilk;

			// For the tree view, use parent, unless already at HLS.  If at HLS, use this level.
			ItemInfo selitm = startitm;
			if (_CurTrans == null)
			{
				if (!startitm.IsHigh)
				{
					startitm = startitm.MyParent;
					selitm = startitm;
				}
			}
			startitm = startitm.FirstSibling;
			while (startitm != null)
			{
				VETreeNode tvn = new VETreeNode(startitm);
				tvn.Tag = startitm;
				int active = this.tvTran.Nodes.Add(tvn);
				if (startitm.ItemID == selitm.ItemID) tvTran.SelectedNode = tvTran.Nodes[active];
				startitm = (startitm.NextItemCount > 0 ? startitm.NextItems[0] : null);
			}
			tvTran.BeforeExpand += new TreeViewCancelEventHandler(tvTran_BeforeExpand);
		}
		private void cbTranSectsFillIn(ItemInfo secitm, int secstart)
		{
			cbTranSects.Items.Clear();
			// if the transition points 'to' procedure, don't list the sections yet.
			if (secitm == null || secitm.MyContent.Type < 10000) return;
			// if sectstart is not -1, then use this as the section to select, otherwise
			// use the id for the item passed in.
			int startitm = secstart;
			if (secstart < 0) secstart = secitm.ItemID;
			ItemInfo selitm = secitm;			// this is the selected 'section'
			secitm = secitm.FirstSibling;
			while (secitm != null)
			{
				// if the selected transition format requires a step be selected (show only step sections), only add step sections
				E_TransUI etm = (E_TransUI)_CurItemFrom.ActiveFormat.PlantFormat.FormatData.TransData.TransTypeList[listBoxTranFmt.SelectedIndex].TransUI;
				if (((!((etm & E_TransUI.StepAllowNone) == E_TransUI.StepAllowNone)) && secitm.IsStepSection) || 
					((etm & E_TransUI.StepAllowNone) == E_TransUI.StepAllowNone))
				{
					int active = cbTranSects.Items.Add(secitm);
					if (secitm.ItemID == secstart) cbTranSects.SelectedIndex = active;
				}
				secitm = (secitm.NextItemCount > 0 ? secitm.NextItems[0] : null);
			}
		}
		private void cbTranProcsFillIn(ItemInfo prcitm)
		{
			cbTranProcs.Items.Clear();
			ItemInfo selitm = prcitm;			// this is the selected 'section'
			prcitm = prcitm.FirstSibling;
			while (prcitm != null)
			{
				int active = cbTranProcs.Items.Add(prcitm);
				if (_CurrentProcedure.ContentID == prcitm.MyContent.ContentID) _CurrentProcIndex = active;
				if (prcitm.MyContent.ContentID == selitm.MyContent.ContentID) cbTranProcs.SelectedIndex = active;
				prcitm = (prcitm.NextItemCount > 0 ? prcitm.NextItems[0] : null);
			}
		}
		private void SetControlsEnabling()
		{
			groupPanelTransitionSets.Style.BackColor = _OrigGroupPanelSets;
			groupPanelTransitionProcs.Style.BackColor = _OrigGroupPanelProcs;
			groupPanelTransitionSect.Style.BackColor = _OrigGroupPanelSects;
			// Based on selection & enum representing the transition format, determine the enabling of associated controls
			if (_CurItemFrom == null) return;
			int indx = listBoxTranFmt.SelectedIndex;
			if (listBoxTranFmt.SelectedIndex < 0 || listBoxTranFmt.SelectedIndex > listBoxTranFmt.Items.Count) indx = 0;
			E_TransUI etm = (E_TransUI)_CurItemFrom.ActiveFormat.PlantFormat.FormatData.TransData.TransTypeList[indx].TransUI;
			
			// do the set tree/combo & procedure combo. in 16-bit system it was types 0, 3, 5
			vlnTreeComboSets.Enabled = false;
			if ((etm & E_TransUI.ProcMenu) == E_TransUI.ProcMenu)
			{
				if (!_AlwaysDisableSets)
				{
					vlnTreeComboSets.Enabled = true;
					groupPanelTransitionSets.Style.BackColor = Color.Cornsilk;
				}
				cbTranProcs.Enabled = true;
				groupPanelTransitionProcs.Style.BackColor = Color.Cornsilk;
			}
			else
			{
				cbTranProcs.SelectedIndex = _CurrentProcIndex > 0 ? _CurrentProcIndex : 0;
				cbTranProcs.Enabled = false;
			}

			// Do section combo, in 16-bit system it was types 0, 3, 4, 5
			if (cbTranSects.Items.Count > 0 &&
				(((etm & E_TransUI.SectDefault) == E_TransUI.SectDefault) ||
				((etm & E_TransUI.SectMenuAny) == E_TransUI.SectMenuAny) ||
				((etm & E_TransUI.SectMenuStep) == E_TransUI.SectMenuStep)))
			{
				cbTranSects.Enabled = true;
				groupPanelTransitionSect.Style.BackColor = Color.Cornsilk;
			}
			else
				cbTranSects.Enabled = false;
			
			// check for range - if no range, then range button/label & step tree selections should be
			// 'cleared/invisble'.
			btnTranRangeClear.Visible = _DoingRange;
			lblxTranRangeTip.Visible = _DoingRange;
			if (_DoingRange)
			{
				lblxTranRangeTip.BackColor = Color.Yellow;
			}
			// if any previous nodes selected for range - clear them here
			if (!_DoingRange && _RangeNode1 != null) ClearRangeTransition();
			// Always allow for step selection if there are items.
			if (tvTran.Nodes.Count>0)tvTran.Enabled = true;
		}
		#endregion
		#region Events
		private void vlnTreeComboSets_BeforeExpand(object sender, TreeViewCancelEventArgs e)
		{
			DropDownNode par = ((DropDownNode)e.Node);
			// get first child's text, if it has one & if the text is VLN_DUMMY, load children
			DropDownNode tn = null;
			if (par.Nodes.Count > 0) tn = (DropDownNode)par.Nodes[0];
			if (tn.Text == "VLN_DUMMY")		// expand this
			{
				par.Nodes.Clear();
				Object obj = par.Tag;
				if (!(obj is FolderInfo)) return;   // should always be folderinfo on expand
				FolderInfo fi = (FolderInfo)obj;
				if (fi.ChildFolderCount > 0)
				{
					foreach (FolderInfo fic in fi.ChildFolders)
					{
						DropDownNode newnode = new DropDownNode(fic.FolderID, fic.ToString());
						par.Nodes.Add(newnode);
						newnode.Tag = fic;
						if (fic.HasChildren)		// allow for '+' for tree expansion
						{
							DropDownNode tnt = new DropDownNode(0, "VLN_DUMMY");
							newnode.Nodes.Add(tnt);
						}
					}
				}
				else if (fi.FolderDocVersionCount > 0)
				{
					foreach (DocVersionInfo dv in fi.FolderDocVersions)
					{
						if ((VersionTypeEnum)dv.VersionType == VersionTypeEnum.WorkingDraft)
						{
							DropDownNode newnode = new DropDownNode(dv.VersionID, dv.ToString());
							newnode.Tag = dv;
							par.Nodes.Add(newnode);
						}
					}
				}
			}
			vlnTreeComboSets.Value = par;
			vlnTreeComboSets.DropDownControl.SelectedNode = par;
		}
		private void DropDown_FinishEditing(object sender, DropDownValueChangedEventArgs e)
		{
			DropDownNode selnd = (DropDownNode)vlnTreeComboSets.DropDownControl.SelectedNode;
			Object obj = selnd.Tag;
			// only allow selections from proc, sect & step controls if the user has
			// selected a folder with only 1 working draft docversion or has
			// selected the docversion itself....
			bool defines_set = false;
			FolderInfo fi = null;
			if (obj is FolderInfo)
			{
				fi = (FolderInfo)obj;
				if (fi.ChildFolderCount == 0)
				{
					// note that the folder may contain more than one docversion, check for
					// only 1 working draft.
					int cntwd = 0;
					foreach (DocVersionInfo dvt in fi.FolderDocVersions)
					{
						if ((VersionTypeEnum)dvt.VersionType == VersionTypeEnum.WorkingDraft) cntwd++;
					}
					if (cntwd == 1) defines_set = true;
				}
			}
			else if (obj is DocVersionInfo)
				defines_set = true;
			if (!defines_set)
			{
				MessageBox.Show("Based on your selection, cannot get list of procedures, narrow the procedure set selection.");
				// disable ALL other controls
				cbTranProcs.Enabled = false;
				cbTranSects.Enabled = false;
				tvTran.Enabled = false;
				return;
			}

			// get to DocVersion node, if at folder... If there are no procedures, notify
			// the user and return (a transition must at least go to a procedure).  
			// Otherwise, enable/disable controls based on format type of transition.
			DocVersionInfo dv = null;
			if (fi != null)
			{
				foreach (DocVersionInfo dvt in fi.FolderDocVersions)
				{
					if ((VersionTypeEnum)dvt.VersionType == VersionTypeEnum.WorkingDraft)
					{
						dv = dvt;
						break;
					}
				}
			}
			else
				dv = (DocVersionInfo)obj;
			if (dv.Procedures.Count < 1)
			{
				MessageBox.Show("There are no procedures in this set. Cannot insert a transition within it.");
				cbTranProcs.Enabled = false;
				cbTranSects.Enabled = false;
				tvTran.Enabled = false;
				return;
			}
			cbTranProcsFillIn(dv.Procedures[0]);
			cbTranProcs.SelectedIndex = 0;
			SetControlsEnabling();
		}
		private void listBoxTranFmt_Click(object sender, EventArgs e)
		{
			if (_InitializingTrans) return;
			if (listBoxTranFmt.SelectedIndex == _TranFmtIndx) return;
			if (_RangeNode1 != null) ClearRangeTransition();
			// if this selection needs a step, but not a procedure, use the current procedure & the section list may need to updated 
			// with step only section.  List the step sections of the current procedure.....
			E_TransUI etmprev = (E_TransUI)_CurItemFrom.ActiveFormat.PlantFormat.FormatData.TransData.TransTypeList[_TranFmtIndx].TransUI;
			E_TransUI etmnew = (E_TransUI)_CurItemFrom.ActiveFormat.PlantFormat.FormatData.TransData.TransTypeList[listBoxTranFmt.SelectedIndex].TransUI;
			if (((etmnew & E_TransUI.ProcCur) == E_TransUI.ProcCur) && ((etmprev & E_TransUI.ProcCur) == E_TransUI.ProcCur) != ((etmnew & E_TransUI.ProcCur) == E_TransUI.ProcCur))
			{
				_CurrentProcedure = _CurrentItemProcedure;
				cbTranProcsFillIn(_CurrentProcedure);
				int sectstartid = FindSectionStart(_CurrentProcedure);
				IList chldrn = _CurrentProcedure.GetChildren();
				if (chldrn != null && chldrn.Count > 0) cbTranSectsFillIn((ItemInfo)chldrn[0], sectstartid);
			}
			_TranFmtIndx = listBoxTranFmt.SelectedIndex;
			groupPanelTranFmt.Style.BackColor = (_CurTrans == null && _TranFmtIndx == 0) ? Color.Yellow : Color.Orange;
			E_TransUI etm = (E_TransUI)_CurItemFrom.ActiveFormat.PlantFormat.FormatData.TransData.TransTypeList[_TranFmtIndx].TransUI;
			_DoingRange = (etm & E_TransUI.StepLast) == E_TransUI.StepLast;
			SetControlsEnabling();
		}
		private void btnUp1_Click(object sender, EventArgs e)
		{
			// if at HLS, don't do anything.
			ItemInfo curitm = (ItemInfo)((VETreeNode)tvTran.Nodes[0]).VEObject;
			if (curitm.IsHigh) return;
			tvTranFillIn(curitm);
		}
		private void tvTran_BeforeExpand(object sender, TreeViewCancelEventArgs e)
		{
			VETreeNode tn = ((VETreeNode)e.Node);
			// true fixes empty expand, but allows for transitions 'way down' in RNO tree. HVJ & PAL wanted to
			// allow this (12/2/09)
			tn.LoadChildren(true); 
		}
		private void cbTranSects_SelectedIndexChanged(object sender, EventArgs e)
		{
			if (_InitializingTrans) return;
			//	a different section was selected, if step section, update step list, otherwise, empty
			//	it & disable.
			ItemInfo secitm = (ItemInfo)cbTranSects.SelectedItem;
			if (!secitm.IsStepSection)
			{
				tvTran.Nodes.Clear();
				tvTran.Enabled = false;
			}
			else
			{
				_InitializingTrans = true;			// just initializing now, don't set any ranges, etc.
				tvTranFillIn(secitm.Steps[0]);
				tvTran.Enabled = true;
				_InitializingTrans = false;
			}
		}
		private int FindSectionStart(ItemInfo prcitm)
		{
			ProcedureConfig pc = (ProcedureConfig)prcitm.MyConfig;
			int sectstartid = -1;
			string ss = pc == null ? null : pc.SectionStart;
			if (ss != null) sectstartid = System.Convert.ToInt32(ss);
			return sectstartid;
		}
		private void cbTranProcs_SelectedIndexChanged(object sender, EventArgs e)
		{
			if (_InitializingTrans) return;
			ItemInfo prcitm = (ItemInfo)cbTranProcs.SelectedItem;
			if (prcitm == null || prcitm.Sections == null || prcitm.Sections.Count < 1)
			{
				cbTranSects.Items.Clear();
				tvTran.Nodes.Clear();
				return;
			}
			int sectstartid = FindSectionStart(prcitm);
			IList chldrn = prcitm.GetChildren();
			cbTranSectsFillIn((ItemInfo)chldrn[0], sectstartid);
		}
		private void tvTran_AfterSelect(object sender, TreeViewEventArgs e)
		{
			if (_InitializingTrans) return;
			// check if node is a true end-point, i.e. not a 'part' node.  If part node, don't
			// allow selection.
			bool allowSave = false;
			VETreeNode vt = tvTran.SelectedNode as VETreeNode;
			if (vt != null)
			{
				ItemInfo ii = vt.VEObject as ItemInfo;
				if (ii != null) allowSave = true;
			}
			if (!_DoingRange)
			{	
				btnTranSave.Enabled = allowSave;
				return;
			}
			if (!allowSave)
			{
				MessageBox.Show("Must select a valid step, not a grouping part such as 'RNO', 'Steps', etc");
				return;
			}
			if (_DoingRange)
			{
				if (_RangeNode1 == null || (_RangeNode1 != null && _RangeNode2 != null))
				{
					if (_RangeNode1 != null) tvTranRangeHilites(false, _RangeNode1, _RangeNode2);
					tvTran.SelectedNode.BackColor = _RangeColor;
					_RangeNode1 = (VETreeNode)tvTran.SelectedNode;
					_RangeNode2 = null;
					lblxTranRangeTip.Text = "Select Last Step \r\nfor Range";
					lblxTranRangeTip.BackColor = Color.LightPink;
				}
				else
				{
					if (_RangeNode2 != null) tvTranRangeHilites(false, _RangeNode1, _RangeNode2);
					_RangeNode2 = (VETreeNode)tvTran.SelectedNode;
					tvTran.SelectedNode.BackColor = _RangeColor;
					tvTranRangeHilites(true, _RangeNode1, _RangeNode2);
					lblxTranRangeTip.Text = "Select First Transition\r\nfor Range";
					lblxTranRangeTip.BackColor = Color.Yellow;
				}
			}
		}
		private void btnTranCancel_Click(object sender, EventArgs e)
		{
			_CurItemFrom = _SavCurItemFrom;
			_TranFmtIndx = _SavTranFmtIndx;
			TransitionFillIn();
		}
		private void btnTranRangeClear_Click(object sender, EventArgs e)
		{
			ClearRangeTransition();
		}
		private void btnTranSave_Click(object sender, EventArgs e)
		{
			string trantxt = "(Resolved Transition Text)";
			string linktxt = null;
			E_TransUI etm = (E_TransUI)_CurItemFrom.ActiveFormat.PlantFormat.FormatData.TransData.TransTypeList[listBoxTranFmt.SelectedIndex].TransUI;
			// if must have a step, test for this first.
			if (!((etm & E_TransUI.StepAllowNone) == E_TransUI.StepAllowNone))		// _tranitem1 is set from step tree node.
			{
				if (tvTran.SelectedNode==null)
				{
					MessageBox.Show("Must 'Select Step' for transition 'to'");
					return;
				}
			}
			ItemInfo toItem = null;
			ItemInfo rangeItem = null;
			if ((etm & E_TransUI.StepLast) == E_TransUI.StepLast)	//range
			{
				if (_RangeNode1==null)
				{
					MessageBox.Show("Must 'Select Step' for transition 'to'");
					return;
				}
				toItem = (ItemInfo)_RangeNode1.VEObject;
				// Get the second item in the range, based on current tree view selection.
				if (_RangeNode2 == null && tvTran.SelectedNode == null)
				{
					MessageBox.Show("Must 'Select Step' for range transition 'to'");
					return;
				}
				if (_RangeNode2 == null) _RangeNode2 = (VETreeNode)tvTran.SelectedNode;
				rangeItem = (ItemInfo)_RangeNode2.VEObject;

				// Check that the two items are of the below the section type.
				if (toItem.MyContent.Type < 20000 || rangeItem.MyContent.Type < 20000)
				{
					MessageBox.Show("Must select two items at the step level or below, i.e. no sections, procedures, etc.");
					return;
				}
				linktxt = string.Format("#Link:Transition:{0} <NewID> {1} {2}", listBoxTranFmt.SelectedIndex, toItem.ItemID, rangeItem.ItemID);
			}
			else if ((etm & E_TransUI.StepFirst) == E_TransUI.StepFirst)
			{
				VETreeNode vtn = (VETreeNode)tvTran.SelectedNode;
				if (vtn != null)
				{
					toItem = (ItemInfo)vtn.VEObject;		// is this cast valid?
					linktxt = string.Format("#Link:Transition:{0} <NewID> {1}", listBoxTranFmt.SelectedIndex, toItem.ItemID);
				}
			}
			if (toItem == null && (etm & E_TransUI.SectMenuAny) == E_TransUI.SectMenuAny)
			{
				if (tvTran.Enabled == false || toItem.IsAccPages)
					toItem = (ItemInfo)cbTranSects.SelectedItem;
				else
				{
					VETreeNode vtn = (VETreeNode)tvTran.SelectedNode;
					toItem = (ItemInfo)vtn.VEObject;
				}
				if (toItem==null)
				{
					MessageBox.Show("Must 'Select Section' or 'Select Step' for transition 'to'");
					return;
				}
				linktxt = string.Format("#Link:Transition:{0} <NewID> {1}", listBoxTranFmt.SelectedIndex, toItem.ItemID);
			}
			if (toItem == null && (((etm & E_TransUI.ProcCur) == E_TransUI.ProcCur) || ((etm & E_TransUI.ProcMenu) == E_TransUI.ProcMenu)))
			{
				toItem = (ItemInfo)cbTranProcs.SelectedItem;
				if (toItem == null)
				{
					MessageBox.Show("Must select an item for transition 'to'");
					return;
				}
				linktxt = string.Format("#Link:Transition:{0} <NewID> {1}", listBoxTranFmt.SelectedIndex, toItem.ItemID);
			}
			// Can I build the text right now?
			trantxt = TransitionText.GetResolvedText(_MyRTB.MyItemInfo, listBoxTranFmt.SelectedIndex,toItem,rangeItem ?? toItem);
			_MyRTB.InsertTran(trantxt, linktxt);
			_MyRTB.Select(_MyRTB.SelectionStart + trantxt.Length + linktxt.Length,0);
			_MyRTB.Focus();
		}
		#endregion
		#region VariousSupportMethods
		private void ClearRangeTransition()
		{
			if (_RangeNode1 == null && _RangeNode2 == null) return;
			tvTranRangeHilites(false, _RangeNode1, _RangeNode2);
			lblxTranRangeTip.Text = "Select First Transition\r\nfor Range";
			_RangeNode1 = _RangeNode2 = null;
		}
		private void tvTranRangeHilites(bool on, VETreeNode node1, VETreeNode node2)
		{
			if (node1==null && node2==null) return;
			if (node1 != null && node2 == null)
			{
				node1.BackColor = on ? _RangeColor : tvTran.BackColor;
				return;
			}

			// If node2 is below node1 in the tree switch them...  get to high level step &
			// then just walk down tree.
			ItemInfo itm1 = (ItemInfo)node1.VEObject;
			ItemInfo itm2 = (ItemInfo)node2.VEObject;
			while (!itm1.IsHigh) itm1 = itm1.MyParent;
			while (!itm2.IsHigh) itm2 = itm2.MyParent;
			ItemInfoList itmlst = (ItemInfoList)itm1.MyParent.GetChildren();
			int i1 = -1;
			int i2 = -1;
			int cnt = 1;
			foreach (ItemInfo chld in itmlst)
			{
				if (chld.ItemID == itm1.ItemID) i1 = cnt;
				if (chld.ItemID == itm2.ItemID) i2 = cnt;
				cnt++;
				if (i1 != -1 && i2 != -1) break;
			}
			if (i1 > i2)
			{
				VETreeNode t = node2;
				node2 = node1;
				node1 = t;
			}

			// Turn Hilighting on/off (depending on bool argument) between the two nodes
			// they may be at different tree levels.

			// find common parent level first and save the 'top parent' node for each selection.
			VETreeNode top1 = node1;
			VETreeNode top2 = node2;
			// loop, walking up node2's tree checking against node1.  If not found, go to node1
			// parent, etc.
			bool foundcommon = false;
			while (!foundcommon && top1 != null)
			{
				while (!foundcommon & top2 != null)
				{
					if (top1.Parent == top2.Parent) foundcommon = true;
					else top2 = (VETreeNode)top2.Parent;
				}
				if (!foundcommon)
				{
					top2 = node2;
					top1 = (VETreeNode)top1.Parent;
				}
			}

			// work down from node1.
			VETreeNode cur = node1;
			while (cur != null)
			{
				cur.BackColor = on ? _RangeColor : tvTran.BackColor;
				cur = (VETreeNode)(cur.NextNode == null ? cur.Parent : cur.NextNode);
				// if these nodes were at the same level, then stop after the current node = range2
				if (cur == top1) cur = null;   // stop at top
				if (cur == top2) top1 = cur = null;
			}
			// set background for highest level between two nodes.
			cur = top1==null?null:(VETreeNode)top1.NextNode;
			while (cur != null)
			{
				cur.BackColor = on ? _RangeColor : tvTran.BackColor;
				cur = (cur == top2) ? null : (VETreeNode)cur.NextNode;
			}
			// finish subtree of second node in range.
			cur = top2==node2?null:node2;
			while (cur != null)
			{
				cur.BackColor = on ? _RangeColor : tvTran.BackColor;
				cur = (VETreeNode)(cur.PrevNode == null ? cur.Parent : cur.PrevNode);
				if (cur == top2) cur = null;   // stop at top
			}
			// hilite last selection..
			top2.BackColor = on ? _RangeColor : tvTran.BackColor;
		}
		#endregion
	}
}