InlineUIContainer.cs source code in C# .NET

                        Code:
                         / DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / wcp / Framework / System / Windows / Documents / InlineUIContainer.cs / 2 / InlineUIContainer.cs
                        
                        
                            //---------------------------------------------------------------------------- 
//
// Copyright (C) Microsoft Corporation.  All rights reserved.
//
// Description: InlineUIContainer - a wrapper for embedded UIElements in text 
//    flow content inline collections
// 
//--------------------------------------------------------------------------- 

using System.ComponentModel;        // DesignerSerializationVisibility 
using System.Windows.Markup; // XamlDesignerSerializationManager
using MS.Internal;
using MS.Internal.Documents;
 
namespace System.Windows.Documents
{ 
    ///  
    /// InlineUIContainer - a wrapper for embedded UIElements in text
    /// flow content inline collections 
    /// 
    [ContentProperty("Child")]
    [TextElementEditingBehaviorAttribute(IsMergeable = false)]
    public class InlineUIContainer : Inline 
    {
        //------------------------------------------------------------------- 
        // 
        // Constructors
        // 
        //-------------------------------------------------------------------

        #region Constructors
 
        /// 
        /// Initializes a new instance of InlineUIContainer element. 
        ///  
        /// 
        /// The purpose of this element is to be a wrapper for UIElements 
        /// when they are embedded into text flow - as items of
        /// InlineCollections.
        /// 
        public InlineUIContainer() 
        {
        } 
 
        /// 
        /// Initializes an InlineBox specifying its child UIElement 
        /// 
        /// 
        /// UIElement set as a child of this inline item
        ///  
        public InlineUIContainer(UIElement childUIElement) : this(childUIElement, null)
        { 
        } 

        ///  
        /// Creates a new InlineUIContainer instance.
        /// 
        /// 
        /// Optional child of the new InlineUIContainer, may be null. 
        /// 
        ///  
        /// Optional position at which to insert the new InlineUIContainer. May 
        /// be null.
        ///  
        public InlineUIContainer(UIElement childUIElement, TextPointer insertionPosition)
        {
            if (insertionPosition != null)
            { 
                insertionPosition.TextContainer.BeginChange();
            } 
            try 
            {
                if (insertionPosition != null) 
                {
                    // This will throw InvalidOperationException if schema validity is violated.
                    insertionPosition.InsertInline(this);
                } 

                this.Child = childUIElement; 
            } 
            finally
            { 
                if (insertionPosition != null)
                {
                    insertionPosition.TextContainer.EndChange();
                } 
            }
        } 
 
        #endregion Constructors
 
        //--------------------------------------------------------------------
        //
        // Public Properties
        // 
        //-------------------------------------------------------------------
 
        #region Public Properties 

        ///  
        /// The content spanned by this TextElement.
        /// 
        public UIElement Child
        { 
            get
            { 
                return this.ContentStart.GetAdjacentElement(LogicalDirection.Forward) as UIElement; 
            }
 
            set
            {
                TextContainer textContainer = this.TextContainer;
 
                textContainer.BeginChange();
                try 
                { 
                    TextPointer contentStart = this.ContentStart;
 
                    UIElement child = Child;
                    if (child != null)
                    {
                        textContainer.DeleteContentInternal(contentStart, this.ContentEnd); 
                        ContainerTextElementField.ClearValue(child);
                    } 
 
                    if (value != null)
                    { 
                        ContainerTextElementField.SetValue(value, this);
                        contentStart.InsertUIElement(value);
                    }
                } 
                finally
                { 
                    textContainer.EndChange(); 
                }
            } 
        }

        #endregion Public Properties
 

        #region Internal Properties 
 
        /// 
        /// UIElementIsland representing embedded Element Layout island within content world. 
        /// 
        internal UIElementIsland UIElementIsland
        {
            get 
            {
                UpdateUIElementIsland(); 
 
                return _uiElementIsland;
            } 
        }

        #endregion Internal Properties
 

        #region Private Methods 
 
        /// 
        /// Ensures the _uiElementIsland variable is up to date 
        /// 
        private void UpdateUIElementIsland()
        {
            UIElement childElement = this.Child; 

            if(_uiElementIsland == null || _uiElementIsland.Root != childElement) 
            { 
                if(_uiElementIsland != null)
                { 
                    _uiElementIsland.Dispose();
                    _uiElementIsland = null;
                }
 
                if(childElement != null)
                { 
                    _uiElementIsland = new UIElementIsland(childElement); 
                }
            } 
        }

        #endregion Private Methods
 

        #region Private Data 
 
        private UIElementIsland _uiElementIsland;
 
        #endregion Private Data
    }
}

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

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