/source/library/Interlace/Binding/Views/CheckBoxView.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 

// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER 

// 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.Text;

using System.Windows.Forms;



#endregion



namespace Interlace.Binding.Views

{

    public class CheckBoxView : BinderViewBase

    {

        CheckBox _boundControl;

        bool _ignoreChangedEvent;



        public CheckBoxView(CheckBox boundControl)

        {

            _boundControl = boundControl;



            _boundControl.CheckedChanged += new EventHandler(_boundControl_CheckedChanged);

        }



        void _boundControl_CheckedChanged(object sender, EventArgs e)

        {

            if (_ignoreChangedEvent) return;



            ChangeModel(_boundControl.Checked);

        }



        public override int OrderingIndex

        {

            get { return _boundControl.TabIndex; }

        }



        private void SetEditValueAndIgnoreEvents(object value)

        {

            try

            {

                _ignoreChangedEvent = true;



                if (value == null)

                {

                    _boundControl.CheckState = CheckState.Indeterminate;

                }

                else

                {

                    _boundControl.Checked = true.Equals(value);

                }

            }

            finally

            {

                _ignoreChangedEvent = false;

            }

        }



        protected override void OnModelChanged(object value)

        {

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

            {

                SetEditValueAndIgnoreEvents(null);

                _boundControl.Enabled = false;

            }

            else

            { 

                SetEditValueAndIgnoreEvents(value);

                _boundControl.Enabled = true;

            }

        }

    }

}