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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 CustomGrid : Repeater
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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 query = RX.Replace(query, string.Empty);
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79
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80 // Write out the first part of the control, the table header
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81 //
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82 writer.Write("<table cellpadding=0 cellspacing=0><tr><td colspan=2>");
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83
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84 // Call the inherited method
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85 //
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86 base.Render(writer);
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87
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88 // Write out a table row closure
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89 //
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90 writer.Write("</td></tr><tr><td class=paging align=left>");
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91
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92 // Determin whether next and previous buttons are required Previous button?
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93 //
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94 if (_currentPageIndex > 0)
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95 writer.Write(string.Format("<a href=?page={0}>< Previous</a>", _currentPageIndex - 1 + query));
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96
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97 // Close the table data tag
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98 //
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99 writer.Write("</td><td align=right class=paging>");
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100
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101 // Next button?
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102 //
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103 if (_currentPageIndex < PageCount)
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104 writer.Write(string.Format("<a href=?page={0}>More ></a>", _currentPageIndex + 1 + query));
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105
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106 // Close the table
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107 //
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108 writer.Write("</td></tr></table>");
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109 }
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110
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111 protected override void OnDataBinding(EventArgs e)
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112 {
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113 // Work out which items we want to render to the page
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114 //
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115 int start = CurrentPageIndex * _pageSize;
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116 int size = Math.Min(_pageSize, ItemCount - start);
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117
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118 IList page = new ArrayList();
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119
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120 // Add the relevant items from the datasource
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121 //
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122 for (int i = 0; i < size; i++)
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123 page.Add(_dataSource[start + i]);
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124
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125 // Set the base objects datasource
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126 //
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127 base.DataSource = page;
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128 base.OnDataBinding(e);
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129 }
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130
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131 public event DataGridPageChangedEventHandler PageIndexChanged;
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132
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133 protected virtual void OnPageIndexChanged(DataGridPageChangedEventArgs e)
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134 {
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135 if (PageIndexChanged != null)
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136 PageIndexChanged(this, e);
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137 }
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138 }
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139 }
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