/source/library/Interlace/Binding/Utilities/BindableOr.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 

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// 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 Interlace.Binding.Views;



#endregion



namespace Interlace.Binding.Utilities

{

    public class BindableOr

    {

        List<BindableLogicInput> _inputs;

        Binder _binder;



        bool _default = false;



        bool _currentValue;



        public BindableOr()

        {

            _inputs = new List<BindableLogicInput>();

            _currentValue = CalculatedOutput;

            _binder = new Binder(this);

        }



        public Binder Binder

        { 	 

            get { return _binder; }

        }



        public void AddBinding(BinderViewBase view)

        {

            _binder.AddBinding("Output", view);

        }



        public void AddBinding(BinderViewBase view, ViewConverterBase converter)

        {

            _binder.AddBinding("Output", view, converter);

        }



        public BinderViewBase CreateInput()

        {

            BindableLogicInput input = new BindableLogicInput();



            _inputs.Add(input);



            input.ValueChanged += new EventHandler(input_ValueChanged);



            UpdateValueIfRequired();



            return new PropertyView(input, "Value", true, true);

        }



        void UpdateValueIfRequired()

        {

            if (CalculatedOutput != _currentValue)

            {

                _currentValue = CalculatedOutput;



                if (OutputChanged != null) OutputChanged(this, EventArgs.Empty);

            }

        }



        void input_ValueChanged(object sender, EventArgs e)

        {

            UpdateValueIfRequired();

        }



        bool CalculatedOutput

        {

            get

            {

                if (_inputs.Count == 0) return _default;



                foreach (BindableLogicInput input in _inputs)

                {

                    if (input.Value) return true;

                }



                return false;

            }

        }



        public event EventHandler OutputChanged;



        public bool Output

        {

            get 

            {

                return _currentValue;

            }

        }

    }

}