DynamicDocumentPaginator.cs source code in C# .NET

                        Code:
                         / DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / wcp / Core / System / Windows / Documents / DynamicDocumentPaginator.cs / 1 / DynamicDocumentPaginator.cs
                        
                        
                            //---------------------------------------------------------------------------- 
//
// Copyright (C) Microsoft Corporation.  All rights reserved.
//
// File: DynamicDocumentPaginator.cs 
//
// Description: Defines advanced methods and properties for paginating layouts, 
//              such as background pagination and methods for tracking content 
//              positions across repaginations.
// 
// History:
//  08/29/2005 : [....] - created.
//
//--------------------------------------------------------------------------- 

using System.ComponentModel;        // AsyncCompletedEventArgs 
using MS.Internal.PresentationCore; // SR, SRID 

namespace System.Windows.Documents 
{
    /// 
    /// Defines advanced methods and properties for paginating layouts, such
    /// as background pagination and methods for tracking content positions 
    /// across repaginations.
    ///  
    public abstract class DynamicDocumentPaginator : DocumentPaginator 
    {
        //------------------------------------------------------------------- 
        //
        //  Public Methods
        //
        //------------------------------------------------------------------- 

        #region Public Methods 
 
        /// 
        /// Returns the page number on which the ContentPosition appears. 
        /// 
        /// Content position.
        /// 
        /// Returns the page number on which the ContentPosition appears. 
        /// 
        ///  
        /// Throws ArgumentException if the ContentPosition does not exist within 
        /// this element's tree.
        ///  
        public abstract int GetPageNumber(ContentPosition contentPosition);

        /// 
        /// Async version of  
        /// 
        /// Content position. 
        ///  
        /// Throws ArgumentException if the ContentPosition does not exist within
        /// this element's tree. 
        /// 
        public virtual void GetPageNumberAsync(ContentPosition contentPosition)
        {
            GetPageNumberAsync(contentPosition, null); 
        }
 
        ///  
        /// Async version of 
        ///  
        /// Content position.
        /// Unique identifier for the asynchronous task.
        /// 
        /// Throws ArgumentException if the ContentPosition does not exist within 
        /// this element�s tree.
        ///  
        public virtual void GetPageNumberAsync(ContentPosition contentPosition, object userState) 
        {
            int pageNumber; 

            // Content position cannot be null.
            if (contentPosition == null)
            { 
                throw new ArgumentNullException("contentPosition");
            } 
            // Content position cannot be Missing. 
            if (contentPosition == ContentPosition.Missing)
            { 
                throw new ArgumentException(SR.Get(SRID.PaginatorMissingContentPosition), "contentPosition");
            }

            pageNumber = GetPageNumber(contentPosition); 
            OnGetPageNumberCompleted(new GetPageNumberCompletedEventArgs(contentPosition, pageNumber, null, false, userState));
        } 
 
        /// 
        /// Returns the ContentPosition for the given page. 
        /// 
        /// Document page.
        /// Returns the ContentPosition for the given page.
        ///  
        /// Throws ArgumentException if the page is not valid.
        ///  
        public abstract ContentPosition GetPagePosition(DocumentPage page); 

        ///  
        /// Returns the ContentPosition for an object within the content.
        /// 
        /// Object within this element's tree.
        /// Returns the ContentPosition for an object within the content. 
        /// 
        /// Throws ArgumentException if the object does not exist within this element's tree. 
        ///  
        public abstract ContentPosition GetObjectPosition(Object value);
 
        #endregion Public Methods

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

        #region Public Properties 

        /// 
        /// Whether content is paginated in the background.
        /// When True, the Paginator will paginate its content in the background, 
        /// firing the PaginationCompleted and PaginationProgress events as appropriate.
        /// Background pagination begins immediately when set to True. If the 
        /// PageSize is modified and this property is set to True, then all pages 
        /// will be repaginated and existing pages may be destroyed.
        /// The default value is False. 
        /// 
        public virtual bool IsBackgroundPaginationEnabled
        {
            get { return false; } 
            set { }
        } 
 
        #endregion Public Properties
 
        //--------------------------------------------------------------------
        //
        //  Public Events
        // 
        //--------------------------------------------------------------------
 
        #region Public Events 

        ///  
        /// Fired when a GetPageNumberAsync call has completed.
        /// 
        public event GetPageNumberCompletedEventHandler GetPageNumberCompleted;
 
        /// 
        /// Fired when all document content has been paginated. After this event 
        /// IsPageCountValid will be True. 
        /// 
        public event EventHandler PaginationCompleted; 

        /// 
        /// Fired when background pagination is enabled, indicating which pages
        /// have been formatted and are available. 
        /// 
        public event PaginationProgressEventHandler PaginationProgress; 
 
        #endregion Public Events
 
        //-------------------------------------------------------------------
        //
        //  Protected Methods
        // 
        //--------------------------------------------------------------------
 
        #region Protected Methods 

        ///  
        /// Override for subclasses that wish to add logic when this event is fired.
        /// 
        /// Event arguments for the GetPageNumberCompleted event.
        protected virtual void OnGetPageNumberCompleted(GetPageNumberCompletedEventArgs e) 
        {
            if (this.GetPageNumberCompleted != null) 
            { 
                this.GetPageNumberCompleted(this, e);
            } 
        }

        /// 
        /// Override for subclasses that wish to add logic when this event is fired. 
        /// 
        /// Event arguments for the PaginationProgress event. 
        protected virtual void OnPaginationProgress(PaginationProgressEventArgs e) 
        {
            if (this.PaginationProgress != null) 
            {
                this.PaginationProgress(this, e);
            }
        } 

        ///  
        /// Override for subclasses that wish to add logic when this event is fired. 
        /// 
        /// Event arguments for the PaginationCompleted event. 
        protected virtual void OnPaginationCompleted(EventArgs e)
        {
            if (this.PaginationCompleted != null)
            { 
                this.PaginationCompleted(this, e);
            } 
        } 

        #endregion Protected Methods 
    }
}

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

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