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//------------------------------------------------------------------------------
// <copyright file="ItemPager.cs" company="Microsoft">
// Copyright (c) Microsoft Corporation. All rights reserved.
// </copyright>
//------------------------------------------------------------------------------
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
*/
/// <include file='doc\ItemPager.uex' path='docs/doc[@for="ItemPager"]/*' />
[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;
/// <include file='doc\ItemPager.uex' path='docs/doc[@for="ItemPager.ItemPager"]/*' />
public ItemPager()
{
}
/// <include file='doc\ItemPager.uex' path='docs/doc[@for="ItemPager.ItemPager1"]/*' />
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;
}
/// <include file='doc\ItemPager.uex' path='docs/doc[@for="ItemPager.ItemIndex"]/*' />
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;
}
}
}
/// <include file='doc\ItemPager.uex' path='docs/doc[@for="ItemPager.ItemCount"]/*' />
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;
}
}
}
}
}
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