170 lines
6.3 KiB
C#
170 lines
6.3 KiB
C#
//------------------------------------------------------------------------------
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// <copyright file="ItemPager.cs" company="Microsoft">
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// Copyright (c) Microsoft Corporation. All rights reserved.
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// </copyright>
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//------------------------------------------------------------------------------
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using System;
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using System.Collections;
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using System.Web;
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using System.Web.UI;
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using System.Web.UI.WebControls;
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using System.Security.Permissions;
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namespace System.Web.UI.MobileControls
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{
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/*
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* Item pager, a class that provides state as items of a control are paginated.
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*
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* Copyright (c) 2000 Microsoft Corporation
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*/
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/// <include file='doc\ItemPager.uex' path='docs/doc[@for="ItemPager"]/*' />
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[AspNetHostingPermission(SecurityAction.LinkDemand, Level=AspNetHostingPermissionLevel.Minimal)]
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[AspNetHostingPermission(SecurityAction.InheritanceDemand, Level=AspNetHostingPermissionLevel.Minimal)]
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[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.")]
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public class ItemPager
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{
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private MobileControl _control;
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private int _firstPageItemCount;
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private int _fullPageItemCount;
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private int _lastPageItemCount;
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private int _firstPage;
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private int _lastPage;
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/// <include file='doc\ItemPager.uex' path='docs/doc[@for="ItemPager.ItemPager"]/*' />
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public ItemPager()
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{
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}
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/// <include file='doc\ItemPager.uex' path='docs/doc[@for="ItemPager.ItemPager1"]/*' />
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public ItemPager(ControlPager pager, MobileControl control, int itemCount, int itemsPerPage, int itemWeight)
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{
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_control = control;
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if (itemsPerPage > 0)
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{
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// User-specified pagination behavior, always given
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// number of items per page.
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if (itemCount < itemsPerPage)
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{
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_firstPageItemCount = itemCount;
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_firstPage = _lastPage = pager.GetPage(itemCount * itemWeight);
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}
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else
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{
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int numberOfPages = (itemCount - 1) / itemsPerPage + 1;
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_firstPageItemCount = itemsPerPage;
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_fullPageItemCount = itemsPerPage;
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_lastPageItemCount = itemCount - (numberOfPages - 1) * itemsPerPage;
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_firstPage = pager.GetPage(itemsPerPage * itemWeight);
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pager.PageCount += numberOfPages - 1;
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if (numberOfPages > 1)
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{
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pager.RemainingWeight = Math.Max(0, pager.PageWeight - _lastPageItemCount * itemWeight);
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}
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_lastPage = _firstPage + numberOfPages - 1;
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}
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}
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else
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{
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int totalItemWeight = itemCount * itemWeight;
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if (totalItemWeight <= pager.RemainingWeight)
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{
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_firstPageItemCount = itemCount;
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_firstPage = _lastPage = pager.GetPage(totalItemWeight);
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}
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else
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{
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_firstPageItemCount = pager.RemainingWeight / itemWeight;
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int remainingItemCount = itemCount - _firstPageItemCount;
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_fullPageItemCount = Math.Max(1, pager.PageWeight / itemWeight);
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int fullPageCount = remainingItemCount / _fullPageItemCount;
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_lastPageItemCount = remainingItemCount % _fullPageItemCount;
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_firstPage = pager.PageCount;
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// increment for first page
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pager.PageCount++;
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pager.RemainingWeight = pager.PageWeight;
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// increment for full pages
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pager.PageCount += fullPageCount;
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// remove remaining weight for last page
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pager.RemainingWeight -= _lastPageItemCount * itemWeight;
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// correct if first page is empty
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if (_firstPageItemCount == 0)
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{
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_firstPage++;
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_firstPageItemCount = Math.Min(_fullPageItemCount, itemCount);
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}
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// correct if last page is empty
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if (_lastPageItemCount == 0)
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{
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pager.PageCount--;
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_lastPageItemCount = Math.Min(_fullPageItemCount, itemCount);
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pager.RemainingWeight = 0;
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}
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_lastPage = pager.PageCount;
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}
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}
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_control.FirstPage = _firstPage;
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_control.LastPage = _lastPage;
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}
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/// <include file='doc\ItemPager.uex' path='docs/doc[@for="ItemPager.ItemIndex"]/*' />
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public int ItemIndex
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{
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get
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{
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int page = _control.Form.CurrentPage;
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if (page < _firstPage || page > _lastPage)
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{
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return -1;
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}
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if (page == _firstPage)
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{
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return 0;
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}
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else
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{
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int fullPageCount = (page - _firstPage) - 1;
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return fullPageCount * _fullPageItemCount + _firstPageItemCount;
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}
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}
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}
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/// <include file='doc\ItemPager.uex' path='docs/doc[@for="ItemPager.ItemCount"]/*' />
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public int ItemCount
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{
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get
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{
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int page = _control.Form.CurrentPage;
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if (page < _firstPage || page > _lastPage)
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{
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return -1;
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}
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if (page == _firstPage)
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{
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return _firstPageItemCount;
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}
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else if (page == _lastPage)
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{
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return _lastPageItemCount;
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}
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else
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{
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return _fullPageItemCount;
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}
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}
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}
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}
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}
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