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1 using System;
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2 using System.Collections;
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3 using System.Text.RegularExpressions;
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4 using System.Web.UI;
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5 using System.Web.UI.WebControls;
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6
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7 namespace PetShop.Web
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8 {
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9 public class CustomList : DataList
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10 {
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11 private static readonly Regex RX = new Regex(@"^&page=\d+", RegexOptions.Compiled);
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12
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13 protected string _emptyText;
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14 private IList _dataSource;
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15 private int _pageSize = 10;
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16 private int _currentPageIndex;
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17 private int _itemCount;
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18
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19 public override object DataSource
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20 {
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21 set
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22 {
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23 //This try catch block is to avoid issues with the VS.NET designer
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24 //The designer will try and bind a datasource which does not derive from ILIST
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25 try
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26 {
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27 _dataSource = (IList)value;
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28 ItemCount = _dataSource.Count;
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29 }
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30 catch
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31 {
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32 _dataSource = null;
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33 ItemCount = 0;
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34 }
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35 }
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36 }
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37
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38 public int PageSize { get { return _pageSize; } set { _pageSize = value; } }
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39 protected virtual int ItemCount { get { return _itemCount; } set { _itemCount = value; } }
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40 public virtual int CurrentPageIndex { get { return _currentPageIndex; } set { _currentPageIndex = value; } }
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41
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42 protected int PageCount { get { return (ItemCount - 1) / _pageSize; } }
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43 public string EmptyText { set { _emptyText = value; } }
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44
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45 public void SetPage(int index)
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46 {
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47 OnPageIndexChanged(new DataGridPageChangedEventArgs(null, index));
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48 }
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49
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50 protected override void OnLoad(EventArgs e)
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51 {
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52 if (Visible)
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53 {
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54 string page = Context.Request["page"];
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55 int index = page != null ? int.Parse(page) : 0;
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56
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57 SetPage(index);
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58 }
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59 }
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60
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61 /// <summary>
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62 /// Overridden method to control how the page is rendered
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63 /// </summary>
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64 /// <param name="writer"></param>
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65 protected override void Render(HtmlTextWriter writer)
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66 {
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67 // Check there is some data attached
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68 //
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69 if (ItemCount == 0)
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70 {
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71 writer.Write(_emptyText);
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72 return;
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73 }
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74
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75 // Mask the query
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76 //
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77 string query = Context.Request.Url.Query.Replace("?", "&");
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78
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79 query = RX.Replace(query, string.Empty);
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80
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81 // Write out the first part of the control, the table header
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82 //
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83 writer.Write("<table cellpadding=0 cellspacing=0><tr><td colspan=2>");
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84
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85 // Call the inherited method
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86 //
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87 base.Render(writer);
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88
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89 // Write out a table row closure
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90 //
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91 writer.Write("</td></tr><tr><td class=paging align=left>");
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92
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93 // Determin whether next and previous buttons are required Previous button?
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94 //
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95 if (_currentPageIndex > 0)
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96 writer.Write(string.Format("<a href=?page={0}>< Previous</a>", _currentPageIndex - 1 + query));
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97
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98 // Close the table data tag
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99 //
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100 writer.Write("</td><td align=right class=paging>");
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101
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102 // Next button?
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103 //
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104 if (_currentPageIndex < PageCount)
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105 writer.Write(string.Format("<a href=?page={0}>More ></a>", _currentPageIndex + 1 + query));
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106
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107 // Close the table
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108 //
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109 writer.Write("</td></tr></table>");
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110 }
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111
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112 protected override void OnDataBinding(EventArgs e)
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113 {
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114 // Work out which items we want to render to the page
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115 //
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116 int start = CurrentPageIndex * _pageSize;
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117 int size = Math.Min(_pageSize, ItemCount - start);
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118
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119 IList page = new ArrayList();
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120
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121 // Add the relevant items from the datasource
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122 //
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123 for (int i = 0; i < size; i++)
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124 page.Add(_dataSource[start + i]);
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125
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126 // set the base objects datasource
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127 //
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128 base.DataSource = page;
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129 base.OnDataBinding(e);
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130 }
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131
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132 public event DataGridPageChangedEventHandler PageIndexChanged;
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133
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134 virtual protected void OnPageIndexChanged(DataGridPageChangedEventArgs e)
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135 {
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136 if (PageIndexChanged != null)
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137 PageIndexChanged(this, e);
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138 }
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139 }
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140 }
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