/source/library/Interlace.DevExpress/Binding/Views/ColumnVisibleView.cs

#region Using Directives and Copyright Notice



// Copyright (c) 2007-2010, Computer Consultancy Pty Ltd

// All rights reserved.

// 

// Redistribution and use in source and binary forms, with or without

// modification, are permitted provided that the following conditions are met:

//     * Redistributions of source code must retain the above copyright

//       notice, this list of conditions and the following disclaimer.

//     * Redistributions in binary form must reproduce the above copyright

//       notice, this list of conditions and the following disclaimer in the

//       documentation and/or other materials provided with the distribution.

//     * Neither the name of the Computer Consultancy Pty Ltd nor the

//       names of its contributors may be used to endorse or promote products

//       derived from this software without specific prior written permission.

// 

// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 

// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 

// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 

// ARE DISCLAIMED. IN NO EVENT SHALL COMPUTER CONSULTANCY PTY LTD BE LIABLE 

// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 

// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 

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// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 

// LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 

// OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH

// DAMAGE.



using System;

using System.Collections.Generic;

using System.Reflection;

using System.Text;

using System.Windows.Forms;



using DevExpress.XtraBars;

using DevExpress.XtraGrid.Columns;

using DevExpress.XtraGrid.Views.Base;



#endregion



namespace Interlace.Binding.Views

{

    public class ColumnVisibleView : BinderViewBase

    {

        delegate void EnabledSetDelegate(bool enabled);



        EnabledSetDelegate _setDelegate;

        bool _unboundValue = false;



        public ColumnVisibleView(params GridColumn[] boundColumns)

        {            

            if (boundColumns.Length==0) return;



            ViewToModelDisabled = true;



            //Store initial visible index state

            Dictionary<GridColumn, int> storedVisibleIndices = GetVisibleIndices(boundColumns[0].View);



            // Take a private copy:

            GridColumn[] boundColumnsCopy = new GridColumn[boundColumns.Length];           

            Array.Copy(boundColumns, boundColumnsCopy, boundColumnsCopy.Length);

            



            _setDelegate = delegate(bool visible)

            {

                Dictionary<GridColumn, bool> storedVisibility = GetColumnVisibility(boundColumns[0].View);

                foreach (GridColumn column in boundColumnsCopy)

                {

                    if (column.Visible != visible) column.Visible = visible;

                }



                ResetColumnOrder(boundColumnsCopy[0].View, storedVisibility, storedVisibleIndices);                

            };

        }               



        protected override void OnModelChanged(object value)

        {

            bool valueToSet;



            if (value == BinderNotBound.Value || value == BinderMissingProperty.Value)

            {

                valueToSet = _unboundValue;

            }

            else if (value is bool)

            {

                valueToSet = (bool)value;

            }

            else

            {

                valueToSet = value != null;

            }



            _setDelegate(valueToSet);

        }



        private Dictionary<GridColumn, bool> GetColumnVisibility(ColumnView columnView)

        {

            Dictionary<GridColumn, bool> storedVisiblity = new Dictionary<GridColumn, bool>();



            foreach (GridColumn column in columnView.Columns)

            {

                storedVisiblity[column] = column.Visible;

            }



            return storedVisiblity;

        }



        private Dictionary<GridColumn, int> GetVisibleIndices(ColumnView columnView)

        {

            Dictionary<GridColumn, int> storedVisibleIndices = new Dictionary<GridColumn, int>();



            foreach (GridColumn column in columnView.Columns)

            {

                if (column.VisibleIndex > -1)

                    storedVisibleIndices[column] = column.VisibleIndex;

            }



            return storedVisibleIndices;

        }



        private void ResetColumnOrder(ColumnView columnView, Dictionary<GridColumn, bool> storedVisiblity, Dictionary<GridColumn, int> storedVisibleIndices)

        {

            int i = 100;



            foreach (GridColumn column in columnView.Columns)

            {

                if (!storedVisiblity[column]) continue;

                if (storedVisibleIndices.ContainsKey(column))

                {

                    column.Visible = true;

                    column.VisibleIndex = storedVisibleIndices[column];

                }

                else

                {

                    column.VisibleIndex = i++;

                }

            }

        }

    }

}