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

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Repository https://bitbucket.org/VahidN/interlace.git View Raw File View Project SPDX
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#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;
            }
        }
    }
}
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