WrapPanel.cs source code in C# .NET

                        Code:
                         / Dotnetfx_Vista_SP2 / Dotnetfx_Vista_SP2 / 8.0.50727.4016 / DEVDIV / depot / DevDiv / releases / Orcas / QFE / wpf / src / Framework / System / Windows / Controls / WrapPanel.cs / 1 / WrapPanel.cs
                        
                        
                            //---------------------------------------------------------------------------- 
//
// Copyright (C) Microsoft Corporation.  All rights reserved.
//
// File: WrapPanel.cs 
//
// Description: Contains the WrapPanel class. 
//              Spec at http://avalon/layout/Specs/WrapPanel.xml 
//
//--------------------------------------------------------------------------- 

using MS.Internal;
using MS.Utility;
using System.ComponentModel; 

using System.Diagnostics; 
using System.Reflection; 
using System.Windows.Threading;
 
using System.Windows.Media;


using System; 

namespace System.Windows.Controls 
{ 
    /// 
    /// WrapPanel is used to place child UIElements at sequential positions from left to the right 
    /// and then "wrap" the lines of children from top to the bottom.
    ///
    /// All children get the layout partition of size ItemWidth x ItemHeight.
    /// 
    /// 
    public class WrapPanel : Panel 
    { 
        //-------------------------------------------------------------------
        // 
        //  Constructors
        //
        //-------------------------------------------------------------------
 
        #region Constructors
 
        ///  
        ///     Default constructor
        ///  
        public WrapPanel() : base()
        {
            _orientation = (Orientation) OrientationProperty.GetDefaultValue(DependencyObjectType);
        } 

        #endregion 
 
        //--------------------------------------------------------------------
        // 
        //  Public Methods
        //
        //-------------------------------------------------------------------
 
        #region Public Methods
 
 
        #endregion
 
        //--------------------------------------------------------------------
        //
        //  Public Properties + Dependency Properties's
        // 
        //--------------------------------------------------------------------
 
        #region Public Properties 

        private static bool IsWidthHeightValid(object value) 
        {
            double v = (double)value;
            return (DoubleUtil.IsNaN(v)) || (v >= 0.0d && !Double.IsPositiveInfinity(v));
        } 

        ///  
        /// DependencyProperty for  property. 
        /// 
        public static readonly DependencyProperty ItemWidthProperty = 
                DependencyProperty.Register(
                        "ItemWidth",
                        typeof(double),
                        typeof(WrapPanel), 
                        new FrameworkPropertyMetadata(
                                Double.NaN, 
                                FrameworkPropertyMetadataOptions.AffectsMeasure), 
                        new ValidateValueCallback(IsWidthHeightValid));
 
        /// 
        /// The ItemWidth and ItemHeight properties specify the size of all items in the WrapPanel.
        /// Note that children of
        /// WrapPanel may have their own Width/Height properties set - the ItemWidth/ItemHeight 
        /// specifies the size of "layout partition" reserved by WrapPanel for the child.
        /// If this property is not set (or set to "Auto" in markup or Double.NaN in code) - the size of layout 
        /// partition is equal to DesiredSize of the child element. 
        /// 
        [TypeConverter(typeof(LengthConverter))] 
        public double ItemWidth
        {
            get { return (double) GetValue(ItemWidthProperty); }
            set { SetValue(ItemWidthProperty, value); } 
        }
 
 
        /// 
        /// DependencyProperty for  property. 
        /// 
        public static readonly DependencyProperty ItemHeightProperty =
                DependencyProperty.Register(
                        "ItemHeight", 
                        typeof(double),
                        typeof(WrapPanel), 
                        new FrameworkPropertyMetadata( 
                                Double.NaN,
                                FrameworkPropertyMetadataOptions.AffectsMeasure), 
                        new ValidateValueCallback(IsWidthHeightValid));


        ///  
        /// The ItemWidth and ItemHeight properties specify the size of all items in the WrapPanel.
        /// Note that children of 
        /// WrapPanel may have their own Width/Height properties set - the ItemWidth/ItemHeight 
        /// specifies the size of "layout partition" reserved by WrapPanel for the child.
        /// If this property is not set (or set to "Auto" in markup or Double.NaN in code) - the size of layout 
        /// partition is equal to DesiredSize of the child element.
        /// 
        [TypeConverter(typeof(LengthConverter))]
        public double ItemHeight 
        {
            get { return (double) GetValue(ItemHeightProperty); } 
            set { SetValue(ItemHeightProperty, value); } 
        }
 
        /// 
        /// DependencyProperty for  property.
        /// 
        public static readonly DependencyProperty OrientationProperty = 
                StackPanel.OrientationProperty.AddOwner(
                        typeof(WrapPanel), 
                        new FrameworkPropertyMetadata( 
                                Orientation.Horizontal,
                                FrameworkPropertyMetadataOptions.AffectsMeasure, 
                                new PropertyChangedCallback(OnOrientationChanged)));

        /// 
        /// Specifies dimension of children positioning in absence of wrapping. 
        /// Wrapping occurs in orthogonal direction. For example, if Orientation is Horizontal,
        /// the items try to form horizontal rows first and if needed are wrapped and form vertical stack of rows. 
        /// If Orientation is Vertical, items first positioned in a vertical column, and if there is 
        /// not enough space - wrapping creates additional columns in horizontal dimension.
        ///  
        public Orientation Orientation
        {
            get { return _orientation; }
            set { SetValue(OrientationProperty, value); } 
        }
 
        ///  
        /// 
        ///  
        private static void OnOrientationChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
        {
            WrapPanel p = (WrapPanel)d;
            p._orientation = (Orientation) e.NewValue; 
        }
 
        private Orientation _orientation; 

        #endregion 

        //-------------------------------------------------------------------
        //
        //  Protected Methods 
        //
        //-------------------------------------------------------------------- 
 
        #region Protected Methods
 
        private struct UVSize
        {
            internal UVSize (Orientation orientation, double width, double height)
            { 
                U = V = 0d;
                _orientation = orientation; 
                Width = width; 
                Height = height;
            } 

            internal UVSize (Orientation orientation)
            {
                U = V = 0d; 
                _orientation = orientation;
            } 
 
            internal double U;
            internal double V; 
            private Orientation _orientation;

            internal double Width
            { 
                get { return (_orientation == Orientation.Horizontal ? U : V); }
                set { if(_orientation == Orientation.Horizontal) U = value; else V = value; } 
            } 
            internal double Height
            { 
                get { return (_orientation == Orientation.Horizontal ? V : U); }
                set { if(_orientation == Orientation.Horizontal) V = value; else U = value; }
            }
        } 

 
        ///  
        /// 
        ///  
        protected override Size MeasureOverride(Size constraint)
        {
            UVSize curLineSize = new UVSize(Orientation);
            UVSize panelSize = new UVSize(Orientation); 
            UVSize uvConstraint = new UVSize(Orientation, constraint.Width, constraint.Height);
            double itemWidth = ItemWidth; 
            double itemHeight = ItemHeight; 
            bool itemWidthSet = !DoubleUtil.IsNaN(itemWidth);
            bool itemHeightSet = !DoubleUtil.IsNaN(itemHeight); 

            Size childConstraint = new Size(
                (itemWidthSet ?  itemWidth  : constraint.Width),
                (itemHeightSet ? itemHeight : constraint.Height)); 

            UIElementCollection children = InternalChildren; 
 
            for(int i=0, count = children.Count; i
        ///  
        ///  
        protected override Size ArrangeOverride(Size finalSize)
        { 
            int firstInLine = 0;
            double itemWidth = ItemWidth;
            double itemHeight = ItemHeight;
            double accumulatedV = 0; 
            double itemU = (Orientation == Orientation.Horizontal ? itemWidth : itemHeight);
            UVSize curLineSize = new UVSize(Orientation); 
            UVSize uvFinalSize = new UVSize(Orientation, finalSize.Width, finalSize.Height); 
            bool itemWidthSet = !DoubleUtil.IsNaN(itemWidth);
            bool itemHeightSet = !DoubleUtil.IsNaN(itemHeight); 
            bool useItemU = (Orientation == Orientation.Horizontal ? itemWidthSet : itemHeightSet);

            UIElementCollection children = InternalChildren;
 
            for(int i=0, count = children.Count; i
    /// WrapPanel is used to place child UIElements at sequential positions from left to the right 
    /// and then "wrap" the lines of children from top to the bottom.
    ///
    /// All children get the layout partition of size ItemWidth x ItemHeight.
    /// 
    /// 
    public class WrapPanel : Panel 
    { 
        //-------------------------------------------------------------------
        // 
        //  Constructors
        //
        //-------------------------------------------------------------------
 
        #region Constructors
 
        ///  
        ///     Default constructor
        ///  
        public WrapPanel() : base()
        {
            _orientation = (Orientation) OrientationProperty.GetDefaultValue(DependencyObjectType);
        } 

        #endregion 
 
        //--------------------------------------------------------------------
        // 
        //  Public Methods
        //
        //-------------------------------------------------------------------
 
        #region Public Methods
 
 
        #endregion
 
        //--------------------------------------------------------------------
        //
        //  Public Properties + Dependency Properties's
        // 
        //--------------------------------------------------------------------
 
        #region Public Properties 

        private static bool IsWidthHeightValid(object value) 
        {
            double v = (double)value;
            return (DoubleUtil.IsNaN(v)) || (v >= 0.0d && !Double.IsPositiveInfinity(v));
        } 

        ///  
        /// DependencyProperty for  property. 
        /// 
        public static readonly DependencyProperty ItemWidthProperty = 
                DependencyProperty.Register(
                        "ItemWidth",
                        typeof(double),
                        typeof(WrapPanel), 
                        new FrameworkPropertyMetadata(
                                Double.NaN, 
                                FrameworkPropertyMetadataOptions.AffectsMeasure), 
                        new ValidateValueCallback(IsWidthHeightValid));
 
        /// 
        /// The ItemWidth and ItemHeight properties specify the size of all items in the WrapPanel.
        /// Note that children of
        /// WrapPanel may have their own Width/Height properties set - the ItemWidth/ItemHeight 
        /// specifies the size of "layout partition" reserved by WrapPanel for the child.
        /// If this property is not set (or set to "Auto" in markup or Double.NaN in code) - the size of layout 
        /// partition is equal to DesiredSize of the child element. 
        /// 
        [TypeConverter(typeof(LengthConverter))] 
        public double ItemWidth
        {
            get { return (double) GetValue(ItemWidthProperty); }
            set { SetValue(ItemWidthProperty, value); } 
        }
 
 
        /// 
        /// DependencyProperty for  property. 
        /// 
        public static readonly DependencyProperty ItemHeightProperty =
                DependencyProperty.Register(
                        "ItemHeight", 
                        typeof(double),
                        typeof(WrapPanel), 
                        new FrameworkPropertyMetadata( 
                                Double.NaN,
                                FrameworkPropertyMetadataOptions.AffectsMeasure), 
                        new ValidateValueCallback(IsWidthHeightValid));


        ///  
        /// The ItemWidth and ItemHeight properties specify the size of all items in the WrapPanel.
        /// Note that children of 
        /// WrapPanel may have their own Width/Height properties set - the ItemWidth/ItemHeight 
        /// specifies the size of "layout partition" reserved by WrapPanel for the child.
        /// If this property is not set (or set to "Auto" in markup or Double.NaN in code) - the size of layout 
        /// partition is equal to DesiredSize of the child element.
        /// 
        [TypeConverter(typeof(LengthConverter))]
        public double ItemHeight 
        {
            get { return (double) GetValue(ItemHeightProperty); } 
            set { SetValue(ItemHeightProperty, value); } 
        }
 
        /// 
        /// DependencyProperty for  property.
        /// 
        public static readonly DependencyProperty OrientationProperty = 
                StackPanel.OrientationProperty.AddOwner(
                        typeof(WrapPanel), 
                        new FrameworkPropertyMetadata( 
                                Orientation.Horizontal,
                                FrameworkPropertyMetadataOptions.AffectsMeasure, 
                                new PropertyChangedCallback(OnOrientationChanged)));

        /// 
        /// Specifies dimension of children positioning in absence of wrapping. 
        /// Wrapping occurs in orthogonal direction. For example, if Orientation is Horizontal,
        /// the items try to form horizontal rows first and if needed are wrapped and form vertical stack of rows. 
        /// If Orientation is Vertical, items first positioned in a vertical column, and if there is 
        /// not enough space - wrapping creates additional columns in horizontal dimension.
        ///  
        public Orientation Orientation
        {
            get { return _orientation; }
            set { SetValue(OrientationProperty, value); } 
        }
 
        ///  
        /// 
        ///  
        private static void OnOrientationChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
        {
            WrapPanel p = (WrapPanel)d;
            p._orientation = (Orientation) e.NewValue; 
        }
 
        private Orientation _orientation; 

        #endregion 

        //-------------------------------------------------------------------
        //
        //  Protected Methods 
        //
        //-------------------------------------------------------------------- 
 
        #region Protected Methods
 
        private struct UVSize
        {
            internal UVSize (Orientation orientation, double width, double height)
            { 
                U = V = 0d;
                _orientation = orientation; 
                Width = width; 
                Height = height;
            } 

            internal UVSize (Orientation orientation)
            {
                U = V = 0d; 
                _orientation = orientation;
            } 
 
            internal double U;
            internal double V; 
            private Orientation _orientation;

            internal double Width
            { 
                get { return (_orientation == Orientation.Horizontal ? U : V); }
                set { if(_orientation == Orientation.Horizontal) U = value; else V = value; } 
            } 
            internal double Height
            { 
                get { return (_orientation == Orientation.Horizontal ? V : U); }
                set { if(_orientation == Orientation.Horizontal) V = value; else U = value; }
            }
        } 

 
        ///  
        /// 
        ///  
        protected override Size MeasureOverride(Size constraint)
        {
            UVSize curLineSize = new UVSize(Orientation);
            UVSize panelSize = new UVSize(Orientation); 
            UVSize uvConstraint = new UVSize(Orientation, constraint.Width, constraint.Height);
            double itemWidth = ItemWidth; 
            double itemHeight = ItemHeight; 
            bool itemWidthSet = !DoubleUtil.IsNaN(itemWidth);
            bool itemHeightSet = !DoubleUtil.IsNaN(itemHeight); 

            Size childConstraint = new Size(
                (itemWidthSet ?  itemWidth  : constraint.Width),
                (itemHeightSet ? itemHeight : constraint.Height)); 

            UIElementCollection children = InternalChildren; 
 
            for(int i=0, count = children.Count; i
        ///  
        ///  
        protected override Size ArrangeOverride(Size finalSize)
        { 
            int firstInLine = 0;
            double itemWidth = ItemWidth;
            double itemHeight = ItemHeight;
            double accumulatedV = 0; 
            double itemU = (Orientation == Orientation.Horizontal ? itemWidth : itemHeight);
            UVSize curLineSize = new UVSize(Orientation); 
            UVSize uvFinalSize = new UVSize(Orientation, finalSize.Width, finalSize.Height); 
            bool itemWidthSet = !DoubleUtil.IsNaN(itemWidth);
            bool itemHeightSet = !DoubleUtil.IsNaN(itemHeight); 
            bool useItemU = (Orientation == Orientation.Horizontal ? itemWidthSet : itemHeightSet);

            UIElementCollection children = InternalChildren;
 
            for(int i=0, count = children.Count; i
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