InlineCollection.cs source code in C# .NET

                        Code:
                         / DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / wcp / Framework / System / Windows / Documents / InlineCollection.cs / 1 / InlineCollection.cs
                        
                        
                            //---------------------------------------------------------------------------- 
//
//    Copyright (C) Microsoft Corporation.  All rights reserved.
//
// Description: Collection of Inline elements 
//
//--------------------------------------------------------------------------- 
namespace System.Windows.Documents 
{
    using MS.Internal; // Invariant 
    using System.Windows.Markup; // ContentWrapper
    using System.Windows.Controls; // TextBlock
    using System.Collections;
 
    /// 
    /// Collection of Inline elements - elements allowed as children 
    /// of Paragraph, Span and TextBlock elements. 
    /// 
    [ContentWrapper(typeof(Run))] 
    [ContentWrapper(typeof(InlineUIContainer))]
    [WhitespaceSignificantCollection]
    public class InlineCollection : TextElementCollection, IList
    { 
        //-------------------------------------------------------------------
        // 
        //  Constructors 
        //
        //------------------------------------------------------------------- 

        #region Constructors

        // Constructor is internal. We allow InlineCollection creation only from inside owning elements such as TextBlock or TextElement. 
        // Note that when a SiblingInlines collection is created for an Inline, the owner of collection is that member Inline object.
        // Flag isOwnerParent indicates whether owner is a parent or a member of the collection. 
        internal InlineCollection(DependencyObject owner, bool isOwnerParent) 
            : base(owner, isOwnerParent)
        { 
        }

        #endregion Constructors
 
        //--------------------------------------------------------------------
        // 
        //  Public Methods 
        //
        //------------------------------------------------------------------- 

        #region Public Methods

        ///  
        /// Implementation of Add method from IList
        ///  
        internal override int OnAdd(object value) 
        {
            int index; 

            this.TextContainer.BeginChange();
            try
            { 
                string text = value as string;
 
                if (text != null) 
                {
                    index = AddText(text, true /* returnIndex */); 
                }
                else
                {
                    UIElement uiElement = value as UIElement; 

                    if (uiElement != null) 
                    { 
                        index = AddUIElement(uiElement, true /* returnIndex */);
                    } 
                    else
                    {
                        index = base.OnAdd(value);
                    } 
                }
            } 
            finally 
            {
                this.TextContainer.EndChange(); 
            }

            return index;
        } 

        ///  
        /// Adds an implicit Run element with a given text 
        /// 
        ///  
        /// Text set as a Text property for implicit Run.
        /// 
        public void Add(string text)
        { 
            AddText(text, false /* returnIndex */);
        } 
 
        /// 
        /// Adds an implicit InlineUIContainer with a given UIElement in it. 
        /// 
        /// 
        /// UIElement set as a Child property for the implicit InlineUIContainer.
        ///  
        public void Add(UIElement uiElement)
        { 
            AddUIElement(uiElement, false /* returnIndex */); 
        }
 
        #endregion Public Methods

        //--------------------------------------------------------------------
        // 
        //  Public Properties
        // 
        //-------------------------------------------------------------------- 

        #region Public Properties 

        /// 
        /// Returns a first Inline element of this collection
        ///  
        public Inline FirstInline
        { 
            get 
            {
                return this.FirstChild; 
            }
        }

        ///  
        /// Returns a last Inline element of this collection
        ///  
        public Inline LastInline 
        {
            get 
            {
                return this.LastChild;
            }
        } 

        #endregion Public Properties 
 
        //-------------------------------------------------------------------
        // 
        //  Internal Methods
        //
        //--------------------------------------------------------------------
 
        #region Internal Methods
 
        ///  
        /// This method performs schema validation for inline collections.
        /// (1) We want to disallow nested Hyperlink elements. 
        /// (2) Also, a Hyperlink element allows only these child types: Run, InlineUIContainer and Span elements other than Hyperlink.
        /// 
        internal override void ValidateChild(Inline child)
        { 
            base.ValidateChild(child);
 
            if (this.Parent is TextElement) 
            {
                TextSchema.ValidateChild((TextElement)this.Parent, child, true /* throwIfIllegalChild */, true /* throwIfIllegalHyperlinkDescendent */); 
            }
            else
            {
                if (!TextSchema.IsValidChildOfContainer(this.Parent.GetType(), child.GetType())) 
                {
                    throw new InvalidOperationException(SR.Get(SRID.TextSchema_ChildTypeIsInvalid, this.Parent.GetType().Name, child.GetType().Name)); 
                } 
            }
        } 

        #endregion Internal Methods

        //------------------------------------------------------------------- 
        //
        //  Private Methods 
        // 
        //-------------------------------------------------------------------
 
        #region Private Methods

        // Worker for OnAdd and Add(string).
        // If returnIndex == true, uses the more costly IList.Add 
        // to calculate and return the index of the newly inserted
        // Run, otherwise returns -1. 
        private int AddText(string text, bool returnIndex) 
        {
            if (text == null) 
            {
                throw new ArgumentNullException("text");
            }
 
            // Special case for TextBlock - to keep its simple content in simple state
            if (this.Parent is TextBlock) 
            { 
                TextBlock textBlock = (TextBlock)this.Parent;
                if (!textBlock.HasComplexContent) 
                {
                    textBlock.Text = textBlock.Text + text;
                    return 0; // There's always one implicit Run with simple content, at index 0.
                } 
            }
 
            Run implicitRun = Run.CreateImplicitRun(this.Parent); 
            int index;
 
            if (returnIndex)
            {
                index = base.OnAdd(implicitRun);
            } 
            else
            { 
                this.Add(implicitRun); 
                index = -1;
            } 

            // Set the Text property after inserting the Run to avoid allocating
            // a temporary TextContainer.
            implicitRun.Text = text; 

            return index; 
        } 

        // Worker for OnAdd and Add(UIElement). 
        // If returnIndex == true, uses the more costly IList.Add
        // to calculate and return the index of the newly inserted
        // Run, otherwise returns -1.
        private int AddUIElement(UIElement uiElement, bool returnIndex) 
        {
            if (uiElement == null) 
            { 
                throw new ArgumentNullException("uiElement");
            } 

            InlineUIContainer implicitInlineUIContainer = Run.CreateImplicitInlineUIContainer(this.Parent);
            int index;
 
            if (returnIndex)
            { 
                index = base.OnAdd(implicitInlineUIContainer); 
            }
            else 
            {
                this.Add(implicitInlineUIContainer);
                index = -1;
            } 

            implicitInlineUIContainer.Child = uiElement; 
 
            return index;
        } 

        #endregion Private Methods
    }
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
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InlineCollection.cs source code in C# .NET

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