1 | using System;
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2 | using System.Windows.Forms;
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3 | using System.Runtime.InteropServices;
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4 | using System.Collections;
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5 |
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6 | namespace Common
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7 | {
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8 | public enum ColumnDataType { String, Integer, DateTime, Decimal, Custom };
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9 |
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10 | // Supports sorting by column in ascending or descending order
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11 | public class ListViewItemComparer : IComparer
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12 | {
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13 | private int column;
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14 | private SortOrder order;
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15 |
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16 | public void ColumnClick(int newColumn)
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17 | {
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18 | // Determine if clicked column is already the column that is being sorted.
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19 | if (newColumn == column)
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20 | {
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21 | // Reverse the current sort direction for this column.
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22 | if (order == SortOrder.Ascending)
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23 | {
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24 | order = SortOrder.Descending;
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25 | }
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26 | else
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27 | {
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28 | order = SortOrder.Ascending;
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29 | }
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30 | }
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31 | else
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32 | {
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33 | // Set the column number that is to be sorted; default to ascending.
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34 | column = newColumn;
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35 | order = SortOrder.Ascending;
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36 | }
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37 | }
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38 |
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39 | public void SetColumn(int newColumn)
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40 | {
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41 | column = newColumn;
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42 | }
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43 |
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44 | public void SetOrder(SortOrder newOrder)
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45 | {
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46 | order = newOrder;
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47 | }
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48 |
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49 | public ListViewItemComparer()
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50 | {
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51 | column = -1;
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52 | order = SortOrder.None;
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53 | }
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54 |
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55 | public delegate int CompareItemEventHandler(ListViewItem x, ListViewItem y, int column);
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56 |
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57 | public event CompareItemEventHandler OnCompareItem;
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58 |
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59 | public int Compare(object x, object y)
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60 | {
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61 | ListViewItem listViewItemX = (ListViewItem)x;
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62 | ListViewItem listViewItemY = (ListViewItem)y;
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63 |
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64 | int result = 0;
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65 | if (listViewItemX != null && listViewItemY != null)
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66 | {
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67 | if (column < listViewItemX.SubItems.Count && column < listViewItemY.SubItems.Count && column >= 0)
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68 | {
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69 | ColumnDataType dataType = ColumnDataType.String;
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70 |
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71 | if (listViewItemX.ListView.Columns[column].Tag != null)
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72 | {
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73 | dataType = (ColumnDataType) (listViewItemX.ListView.Columns[column].Tag);
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74 | }
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75 |
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76 | if (dataType == ColumnDataType.Integer)
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77 | {
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78 | if (int.TryParse(listViewItemX.SubItems[column].Text, out var xi) &&
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79 | int.TryParse(listViewItemY.SubItems[column].Text, out var yi))
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80 | {
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81 | if (xi < yi) result = -1;
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82 | else if (xi > yi) result = 1;
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83 | else result = 0;
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84 | }
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85 | }
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86 | else if (dataType == ColumnDataType.Decimal)
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87 | {
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88 | if (decimal.TryParse(listViewItemX.SubItems[column].Text, out var xi) &&
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89 | decimal.TryParse(listViewItemY.SubItems[column].Text, out var yi))
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90 | {
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91 | if (xi < yi) result = -1;
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92 | else if (xi > yi) result = 1;
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93 | else result = 0;
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94 | }
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95 | }
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96 | else if (dataType == ColumnDataType.DateTime)
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97 | {
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98 | if (DateTime.TryParse(listViewItemX.SubItems[column].Text, out var xi) &&
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99 | DateTime.TryParse(listViewItemY.SubItems[column].Text, out var yi))
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100 | {
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101 | result = DateTime.Compare(xi, yi);
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102 | }
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103 | }
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104 | else if (dataType == ColumnDataType.Custom)
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105 | {
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106 | if (OnCompareItem != null)
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107 | {
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108 | result = OnCompareItem(listViewItemX, listViewItemY, column);
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109 | }
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110 | }
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111 | else
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112 | result = string.CompareOrdinal(listViewItemX.SubItems[column].Text,
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113 | listViewItemY.SubItems[column].Text);
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114 | }
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115 | else
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116 | {
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117 | if (!listViewItemX.Selected && listViewItemY.Selected) result = 1;
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118 | else if (listViewItemX.Selected && !listViewItemY.Selected) result = -1;
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119 | }
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120 | }
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121 |
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122 | switch (order)
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123 | {
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124 | case SortOrder.Ascending:
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125 | return result;
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126 | case SortOrder.Descending:
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127 | return -result;
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128 | default:
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129 | return 0;
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130 | }
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131 | }
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132 |
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133 | public static void ConfigureListView(ListView listView, int column = -1, SortOrder order = SortOrder.None)
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134 | {
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135 | if (listView.ListViewItemSorter == null)
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136 | {
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137 | listView.ListViewItemSorter = new ListViewItemComparer();
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138 | }
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139 |
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140 | ((ListViewItemComparer) listView.ListViewItemSorter).SetOrder(order);
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141 | ((ListViewItemComparer) listView.ListViewItemSorter).SetColumn(column);
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142 | if ((column != -1) && (order != SortOrder.None))
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143 | {
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144 | listView.Sort();
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145 | listView.SetSortIcon(column, order);
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146 | }
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147 | listView.ColumnClick += delegate (object sender, ColumnClickEventArgs e)
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148 | {
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149 | ((ListViewItemComparer) ((ListView) sender).ListViewItemSorter).ColumnClick(e.Column);
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150 | ((ListView) sender).Sort();
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151 | ((ListView) sender).SetSortIcon(((ListViewItemComparer) ((ListView) sender).ListViewItemSorter).column, ((ListViewItemComparer) ((ListView) sender).ListViewItemSorter).order);
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152 | };
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153 | }
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154 |
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155 | public static void SetColumnDataType(ListView listView, int index, ColumnDataType dataType)
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156 | {
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157 | listView.Columns[index].Tag = dataType;
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158 | }
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159 | }
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160 |
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161 | internal static class ListViewExtensions
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162 | {
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163 | [StructLayout(LayoutKind.Sequential)]
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164 | public struct LVCOLUMN
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165 | {
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166 | public Int32 mask;
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167 | public Int32 cx;
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168 | [MarshalAs(UnmanagedType.LPTStr)]
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169 | public string pszText;
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170 | public IntPtr hbm;
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171 | public Int32 cchTextMax;
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172 | public Int32 fmt;
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173 | public Int32 iSubItem;
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174 | public Int32 iImage;
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175 | public Int32 iOrder;
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176 | }
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177 |
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178 | const Int32 HDI_WIDTH = 0x0001;
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179 | const Int32 HDI_HEIGHT = HDI_WIDTH;
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180 | const Int32 HDI_TEXT = 0x0002;
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181 | const Int32 HDI_FORMAT = 0x0004;
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182 | const Int32 HDI_LPARAM = 0x0008;
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183 | const Int32 HDI_BITMAP = 0x0010;
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184 | const Int32 HDI_IMAGE = 0x0020;
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185 | const Int32 HDI_DI_SETITEM = 0x0040;
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186 | const Int32 HDI_ORDER = 0x0080;
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187 | const Int32 HDI_FILTER = 0x0100;
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188 |
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189 | const Int32 HDF_LEFT = 0x0000;
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190 | const Int32 HDF_RIGHT = 0x0001;
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191 | const Int32 HDF_CENTER = 0x0002;
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192 | const Int32 HDF_JUSTIFYMASK = 0x0003;
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193 | const Int32 HDF_RTLREADING = 0x0004;
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194 | const Int32 HDF_OWNERDRAW = 0x8000;
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195 | const Int32 HDF_STRING = 0x4000;
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196 | const Int32 HDF_BITMAP = 0x2000;
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197 | const Int32 HDF_BITMAP_ON_RIGHT = 0x1000;
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198 | const Int32 HDF_IMAGE = 0x0800;
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199 | const Int32 HDF_SORTUP = 0x0400;
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200 | const Int32 HDF_SORTDOWN = 0x0200;
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201 |
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202 | const Int32 LVM_FIRST = 0x1000; // List messages
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203 | const Int32 LVM_GETHEADER = LVM_FIRST + 31;
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204 | const Int32 HDM_FIRST = 0x1200; // Header messages
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205 | const Int32 HDM_SETIMAGELIST = HDM_FIRST + 8;
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206 | const Int32 HDM_GETIMAGELIST = HDM_FIRST + 9;
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207 | const Int32 HDM_GETITEM = HDM_FIRST + 11;
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208 | const Int32 HDM_SETITEM = HDM_FIRST + 12;
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209 |
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210 | [DllImport("user32.dll")]
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211 | private static extern IntPtr SendMessage(IntPtr hWnd, uint Msg, IntPtr wParam, IntPtr lParam);
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212 |
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213 | [DllImport("user32.dll", EntryPoint = "SendMessage")]
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214 | private static extern IntPtr SendMessageLVCOLUMN(IntPtr hWnd, Int32 Msg, IntPtr wParam, ref LVCOLUMN lPLVCOLUMN);
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215 |
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216 |
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217 | // This method used to set arrow icon
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218 | public static void SetSortIcon(this ListView listView, int columnIndex, SortOrder order)
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219 | {
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220 | IntPtr columnHeader = SendMessage(listView.Handle, LVM_GETHEADER, IntPtr.Zero, IntPtr.Zero);
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221 |
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222 | for (int columnNumber = 0; columnNumber <= listView.Columns.Count - 1; columnNumber++)
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223 | {
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224 | IntPtr columnPtr = new IntPtr(columnNumber);
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225 | LVCOLUMN lvColumn = new LVCOLUMN {mask = HDI_FORMAT};
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226 |
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227 | SendMessageLVCOLUMN(columnHeader, HDM_GETITEM, columnPtr, ref lvColumn);
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228 |
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229 | if (order != SortOrder.None && columnNumber == columnIndex)
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230 | {
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231 | switch (order)
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232 | {
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233 | case SortOrder.Ascending:
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234 | lvColumn.fmt &= ~HDF_SORTDOWN;
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235 | lvColumn.fmt |= HDF_SORTUP;
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236 | break;
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237 | case SortOrder.Descending:
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238 | lvColumn.fmt &= ~HDF_SORTUP;
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239 | lvColumn.fmt |= HDF_SORTDOWN;
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240 | break;
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241 | }
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242 | lvColumn.fmt |= (HDF_LEFT | HDF_BITMAP_ON_RIGHT);
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243 | }
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244 | else
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245 | {
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246 | lvColumn.fmt &= ~HDF_SORTDOWN & ~HDF_SORTUP & ~HDF_BITMAP_ON_RIGHT;
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247 | }
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248 |
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249 | SendMessageLVCOLUMN(columnHeader, HDM_SETITEM, columnPtr, ref lvColumn);
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250 | }
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251 | }
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252 | }
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253 | } |
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