MARKUS

// (c) Copyright Microsoft Corporation.

// This source is subject to the Microsoft Public License (Ms-PL).

// Please see http://go.microsoft.com/fwlink/?LinkID=131993 for details.

// All other rights reserved.

using System;

using System.Runtime.InteropServices;

using System.Windows.Controls;

namespace KCOM.WrapPanel

{

    /// <summary>

    /// The OrientedSize structure is used to abstract the growth direction from

    /// the layout algorithms of WrapPanel.  When the growth direction is

    /// oriented horizontally (ex: the next element is arranged on the side of

    /// the previous element), then the Width grows directly with the placement

    /// of elements and Height grows indirectly with the size of the largest

    /// element in the row.  When the orientation is reversed, so is the

    /// directional growth with respect to Width and Height.

    /// </summary>

    [StructLayout(LayoutKind.Sequential)]

    internal struct OrientedSize

    {

        /// <summary>

        /// The orientation of the structure.

        /// </summary>

        private Orientation _orientation;

        /// <summary>

        /// Gets the orientation of the structure.

        /// </summary>

        public Orientation Orientation

        {

            get { return _orientation; }

        }

        /// <summary>

        /// The size dimension that grows directly with layout placement.

        /// </summary>

        private double _direct;

        /// <summary>

        /// Gets or sets the size dimension that grows directly with layout

        /// placement.

        /// </summary>

        public double Direct

        {

            get { return _direct; }

            set { _direct = value; }

        }

        /// <summary>

        /// The size dimension that grows indirectly with the maximum value of

        /// the layout row or column.

        /// </summary>

        private double _indirect;

        /// <summary>

        /// Gets or sets the size dimension that grows indirectly with the

        /// maximum value of the layout row or column.

        /// </summary>

        public double Indirect

        {

            get { return _indirect; }

            set { _indirect = value; }

        }

        /// <summary>

        /// Gets or sets the width of the size.

        /// </summary>

        public double Width

        {

            get

            {

                return (Orientation == Orientation.Horizontal) ?

                    Direct :

                    Indirect;

            }

            set

            {

                if (Orientation == Orientation.Horizontal)

                {

                    Direct = value;

                }

                else

                {

                    Indirect = value;

                }

            }

        }

        /// <summary>

        /// Gets or sets the height of the size.

        /// </summary>

        public double Height

        {

            get

            {

                return (Orientation != Orientation.Horizontal) ?

                    Direct :

                    Indirect;

            }

            set

            {

                if (Orientation != Orientation.Horizontal)

                {

                    Direct = value;

                }

                else

                {

                    Indirect = value;

                }

            }

        }

        /// <summary>

        /// Initializes a new OrientedSize structure.

        /// </summary>

        /// <param name="orientation">Orientation of the structure.</param>

        public OrientedSize(Orientation orientation) :

            this(orientation, 0.0, 0.0)

        {

        }

        /// <summary>

        /// Initializes a new OrientedSize structure.

        /// </summary>

        /// <param name="orientation">Orientation of the structure.</param>

        /// <param name="width">Un-oriented width of the structure.</param>

        /// <param name="height">Un-oriented height of the structure.</param>

        public OrientedSize(Orientation orientation, double width, double height)

        {

            _orientation = orientation;

            // All fields must be initialized before we access the this pointer

            _direct = 0.0;

            _indirect = 0.0;

            Width = width;

            Height = height;

        }

    }

}