Imported Upstream version 4.6.0.125

Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4

mcs/class/referencesource/System.Web.Mobile/UI/MobileControls/ItemPager.cs

@@ -0,0 +1,169 @@
+//------------------------------------------------------------------------------
+// <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;
+                }
+            }
+        }
+
+    }
+
+}