ItemPager.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / MIT / System / Web / UI / MobileControls / ItemPager.cs / 1305376 / ItemPager.cs
                        

                        
                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//----------------------------------------------------------------------------- 

using System; 
using System.Collections; 
using System.Web;
using System.Web.UI; 
using System.Web.UI.WebControls;
using System.Security.Permissions;

namespace System.Web.UI.MobileControls 
{
 
    /* 
     * Item pager, a class that provides state as items of a control are paginated.
     * 
     * Copyright (c) 2000 Microsoft Corporation
     */

    ///  
    [AspNetHostingPermission(SecurityAction.LinkDemand, Level=AspNetHostingPermissionLevel.Minimal)]
    [AspNetHostingPermission(SecurityAction.InheritanceDemand, Level=AspNetHostingPermissionLevel.Minimal)] 
    [Obsolete("The System.Web.Mobile.dll assembly has been deprecated and should no longer be used. For information about how to develop ASP.NET mobile applications, see http://go.microsoft.com/fwlink/?LinkId=157231.")] 
    public class ItemPager
    { 

        private MobileControl _control;
        private int _firstPageItemCount;
        private int _fullPageItemCount; 
        private int _lastPageItemCount;
        private int _firstPage; 
        private int _lastPage; 

        ///  
        public ItemPager()
        {
        }
 
        /// 
        public ItemPager(ControlPager pager, MobileControl control, int itemCount, int itemsPerPage, int itemWeight) 
        { 
            _control = control;
 
            if (itemsPerPage > 0)
            {
                // User-specified pagination behavior, always given
                // number of items per page. 

                if (itemCount < itemsPerPage) 
                { 
                    _firstPageItemCount = itemCount;
                    _firstPage = _lastPage = pager.GetPage(itemCount * itemWeight); 
                }
                else
                {
                    int numberOfPages = (itemCount - 1) / itemsPerPage + 1; 
                    _firstPageItemCount = itemsPerPage;
                    _fullPageItemCount = itemsPerPage; 
                    _lastPageItemCount = itemCount - (numberOfPages - 1) * itemsPerPage; 
                    _firstPage = pager.GetPage(itemsPerPage * itemWeight);
                    pager.PageCount += numberOfPages - 1; 
                    if (numberOfPages > 1)
                    {
                        pager.RemainingWeight = Math.Max(0, pager.PageWeight - _lastPageItemCount * itemWeight);
                    } 
                    _lastPage = _firstPage + numberOfPages - 1;
                } 
            } 
            else
            { 
                int totalItemWeight = itemCount * itemWeight;
                if (totalItemWeight <= pager.RemainingWeight)
                {
                    _firstPageItemCount = itemCount; 
                    _firstPage = _lastPage = pager.GetPage(totalItemWeight);
                } 
                else 
                {
                    _firstPageItemCount = pager.RemainingWeight / itemWeight; 
                    int remainingItemCount = itemCount - _firstPageItemCount;
                    _fullPageItemCount  = Math.Max(1, pager.PageWeight / itemWeight);
                    int fullPageCount = remainingItemCount / _fullPageItemCount;
                    _lastPageItemCount  = remainingItemCount % _fullPageItemCount; 

                    _firstPage = pager.PageCount; 
 
                    //  increment for first page
                    pager.PageCount++; 
                    pager.RemainingWeight = pager.PageWeight;

                    //  increment for full pages
                    pager.PageCount += fullPageCount; 

                    //  remove remaining weight for last page 
                    pager.RemainingWeight -= _lastPageItemCount * itemWeight; 

                    //  correct if first page is empty 
                    if (_firstPageItemCount == 0)
                    {
                        _firstPage++;
                        _firstPageItemCount = Math.Min(_fullPageItemCount, itemCount); 
                    }
                    //  correct if last page is empty 
                    if (_lastPageItemCount == 0) 
                    {
                        pager.PageCount--; 
                        _lastPageItemCount = Math.Min(_fullPageItemCount, itemCount);
                        pager.RemainingWeight = 0;
                    }
                    _lastPage = pager.PageCount; 
                }
            } 
            _control.FirstPage = _firstPage; 
            _control.LastPage = _lastPage;
        } 

        /// 
        public int ItemIndex
        { 
            get
            { 
                int page = _control.Form.CurrentPage; 
                if (page < _firstPage || page > _lastPage)
                { 
                    return -1;
                }
                if (page == _firstPage)
                { 
                    return 0;
                } 
                else 
                {
                    int fullPageCount = (page - _firstPage) - 1; 
                    return fullPageCount * _fullPageItemCount + _firstPageItemCount;
                }
            }
        } 

        ///  
        public int ItemCount 
        {
            get 
            {
                int page = _control.Form.CurrentPage;
                if (page < _firstPage || page > _lastPage)
                { 
                    return -1;
                } 
                if (page == _firstPage) 
                {
                    return _firstPageItemCount; 
                }
                else if (page == _lastPage)
                {
                    return _lastPageItemCount; 
                }
                else 
                { 
                    return _fullPageItemCount;
                } 
            }
        }

    } 

} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.

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