adamc@944
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1 con colMeta' = fn (row :: Type) (input :: Type) (filter :: Type) =>
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2 {Header : string,
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3 Project : row -> transaction input,
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4 Update : row -> input -> transaction row,
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5 Display : input -> xbody,
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6 Edit : input -> xbody,
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7 Validate : input -> signal bool,
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8 CreateFilter : transaction filter,
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9 DisplayFilter : filter -> xbody,
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10 Filter : filter -> row -> signal bool}
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11
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12 con colMeta = fn (row :: Type) (global_input_filter :: (Type * Type * Type)) =>
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13 {Initialize : transaction global_input_filter.1,
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14 Handlers : global_input_filter.1 -> colMeta' row global_input_filter.2 global_input_filter.3}
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15
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16 con aggregateMeta = fn (row :: Type) (acc :: Type) =>
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17 {Initial : acc,
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18 Step : row -> acc -> acc,
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19 Display : acc -> xbody}
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20
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21 functor Make(M : sig
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22 type row
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23 type key
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24 val keyOf : row -> key
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25
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26 val list : transaction (list row)
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27 val new : transaction row
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28 val save : key -> row -> transaction unit
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29 val delete : key -> transaction unit
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30
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31 con cols :: {(Type * Type * Type)}
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32 val cols : $(map (colMeta row) cols)
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33
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34 val folder : folder cols
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35
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36 con aggregates :: {Type}
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37 val aggregates : $(map (aggregateMeta row) aggregates)
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38 val aggFolder : folder aggregates
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39 end) = struct
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40 style tabl
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41 style tr
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42 style th
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43 style td
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44 style agg
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45
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46 fun make (row : M.row) [input] [filter] (m : colMeta' M.row input filter) : transaction input = m.Project row
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47
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48 fun makeAll cols row = @@Monad.exec [transaction] _ [map snd3 M.cols]
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49 (map2 [fst3] [colMeta M.row] [fn p => transaction (snd3 p)]
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50 (fn [p] data meta => make row [_] [_] (meta.Handlers data))
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51 [_] M.folder cols M.cols)
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52 (@@Folder.mp [_] [_] M.folder)
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53
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54 type grid = {Cols : $(map fst3 M.cols),
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55 Rows : Dlist.dlist {Row : source M.row,
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56 Cols : source ($(map snd3 M.cols)),
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57 Updating : source bool,
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58 Selected : source bool},
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59 Selection : source bool,
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60 Filters : $(map thd3 M.cols)}
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61
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62 fun addRow cols rows row =
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63 rowS <- source row;
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64 cols <- makeAll cols row;
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65 colsS <- source cols;
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66 ud <- source False;
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67 sd <- source False;
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68 Monad.ignore (Dlist.append rows {Row = rowS,
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69 Cols = colsS,
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70 Updating = ud,
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71 Selected = sd})
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72
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73 val grid =
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74 cols <- Monad.mapR [colMeta M.row] [fst3]
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75 (fn [nm :: Name] [p :: (Type * Type * Type)] meta => meta.Initialize)
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76 [_] M.folder M.cols;
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77
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78 filters <- Monad.mapR2 [colMeta M.row] [fst3] [thd3]
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79 (fn [nm :: Name] [p :: (Type * Type * Type)] meta state =>
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80 (meta.Handlers state).CreateFilter)
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81 [_] M.folder M.cols cols;
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82
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83 rows <- Dlist.create {Filter = fn all =>
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84 row <- signal all.Row;
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85 foldR3 [colMeta M.row] [fst3] [thd3] [fn _ => M.row -> signal bool]
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86 (fn [nm :: Name] [p :: (Type * Type * Type)]
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87 [rest :: {(Type * Type * Type)}] [[nm] ~ rest]
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88 meta state filter combinedFilter row =>
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89 previous <- combinedFilter row;
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90 this <- (meta.Handlers state).Filter filter row;
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91 return (previous && this))
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92 (fn _ => return True)
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93 [_] M.folder M.cols cols filters row};
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94 sel <- source False;
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95 return {Cols = cols, Rows = rows, Selection = sel, Filters = filters}
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96
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97 fun sync {Cols = cols, Rows = rows, ...} =
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98 Dlist.clear rows;
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99 init <- rpc M.list;
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100 List.app (addRow cols rows) init
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101
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102 fun render grid = <xml>
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103 <table class={tabl}>
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104 <tr class={tr}>
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105 <th/> <th/> <th/>
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106 {foldRX2 [fst3] [colMeta M.row] [_]
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107 (fn [nm :: Name] [p :: (Type * Type * Type)] [rest :: {(Type * Type * Type)}] [[nm] ~ rest]
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108 data (meta : colMeta M.row p) =>
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109 <xml><th class={th}>{[(meta.Handlers data).Header]}</th></xml>)
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110 [_] M.folder grid.Cols M.cols}
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111 </tr>
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112
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113 {Dlist.render (fn {Row = rowS, Cols = colsS, Updating = ud, Selected = sd} pos =>
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114 let
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115 val delete =
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116 Dlist.delete pos;
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117 row <- get rowS;
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118 rpc (M.delete (M.keyOf row))
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119
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120 val update = set ud True
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121
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122 val cancel =
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123 set ud False;
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124 row <- get rowS;
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125 cols <- makeAll grid.Cols row;
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126 set colsS cols
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127
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128 val save =
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129 cols <- get colsS;
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130 errors <- Monad.foldR3 [fst3] [colMeta M.row] [snd3] [fn _ => option string]
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131 (fn [nm :: Name] [p :: (Type * Type * Type)] [rest :: {(Type * Type * Type)}]
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132 [[nm] ~ rest] data meta v errors =>
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133 b <- current ((meta.Handlers data).Validate v);
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134 return (if b then
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135 errors
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136 else
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137 case errors of
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138 None => Some ((meta.Handlers data).Header)
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139 | Some s => Some ((meta.Handlers data).Header
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140 ^ ", " ^ s)))
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141 None [_] M.folder grid.Cols M.cols cols;
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142
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143 case errors of
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144 Some s => alert ("Can't save because the following columns have invalid values:\n"
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145 ^ s)
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146 | None =>
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147 set ud False;
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148 row <- get rowS;
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149 row' <- Monad.foldR3 [fst3] [colMeta M.row] [snd3] [fn _ => M.row]
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150 (fn [nm :: Name] [t :: (Type * Type * Type)]
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151 [rest :: {(Type * Type * Type)}]
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152 [[nm] ~ rest] data meta v row' =>
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153 (meta.Handlers data).Update row' v)
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154 row [_] M.folder grid.Cols M.cols cols;
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155 rpc (M.save (M.keyOf row) row');
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156 set rowS row';
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157
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158 cols <- makeAll grid.Cols row';
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159 set colsS cols
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160 in
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161 <xml><tr class={tr}>
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162 <td>
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163 <dyn signal={b <- signal grid.Selection;
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164 return (if b then
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165 <xml><ccheckbox source={sd}/></xml>
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166 else
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167 <xml/>)}/>
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168 </td>
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169
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170 <td>
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171 <dyn signal={b <- signal ud;
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172 return (if b then
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173 <xml><button value="Save" onclick={save}/></xml>
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174 else
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175 <xml><button value="Update" onclick={update}/></xml>)}/>
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176 </td>
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177
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178 <td><dyn signal={b <- signal ud;
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179 return (if b then
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180 <xml><button value="Cancel" onclick={cancel}/></xml>
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181 else
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182 <xml><button value="Delete" onclick={delete}/></xml>)}/>
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183 </td>
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184
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185 <dyn signal={cols <- signal colsS;
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186 return (foldRX3 [fst3] [colMeta M.row] [snd3] [_]
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187 (fn [nm :: Name] [t :: (Type * Type * Type)]
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188 [rest :: {(Type * Type * Type)}]
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189 [[nm] ~ rest] data meta v =>
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190 <xml><td class={td}>
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191 <dyn signal={b <- signal ud;
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192 return (if b then
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193 (meta.Handlers data).Edit v
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194 else
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195 (meta.Handlers data).Display
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196 v)}/>
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197 <dyn signal={b <- signal ud;
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198 if b then
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199 valid <-
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200 (meta.Handlers data).Validate v;
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201 return (if valid then
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202 <xml/>
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203 else
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204 <xml>!</xml>)
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205 else
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206 return <xml/>}/>
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207 </td></xml>)
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208 [_] M.folder grid.Cols M.cols cols)}/>
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209 </tr></xml>
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210 end) grid.Rows}
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211
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212 <dyn signal={rows <- Dlist.foldl (fn row => Monad.mapR2 [aggregateMeta M.row] [id] [id]
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213 (fn [nm :: Name] [t :: Type] meta acc =>
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214 Monad.mp (fn v => meta.Step v acc)
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215 (signal row.Row))
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216 [_] M.aggFolder M.aggregates)
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217 (mp [aggregateMeta M.row] [id]
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218 (fn [t] meta => meta.Initial)
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219 [_] M.aggFolder M.aggregates) grid.Rows;
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220 return <xml><tr>
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221 <th colspan={3}>Aggregates</th>
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222 {foldRX2 [aggregateMeta M.row] [id] [_]
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223 (fn [nm :: Name] [t :: Type] [rest :: {Type}] [[nm] ~ rest] meta acc =>
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224 <xml><td class={agg}>{meta.Display acc}</td></xml>)
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225 [_] M.aggFolder M.aggregates rows}
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226 </tr></xml>}/>
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227
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228 <tr><th colspan={3}>Filters</th>
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229 {foldRX3 [colMeta M.row] [fst3] [thd3] [_]
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230 (fn [nm :: Name] [p :: (Type * Type * Type)] [rest :: {(Type * Type * Type)}] [[nm] ~ rest]
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231 meta state filter => <xml><td>{(meta.Handlers state).DisplayFilter filter}</td></xml>)
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232 [_] M.folder M.cols grid.Cols grid.Filters}
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233 </tr>
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234 </table>
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235
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236 <button value="New row" onclick={row <- rpc M.new;
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237 addRow grid.Cols grid.Rows row}/>
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238 <button value="Refresh" onclick={sync grid}/>
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239 </xml>
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240
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241 fun showSelection grid = grid.Selection
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242
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243 fun selection grid = Dlist.foldl (fn {Row = rowS, Selected = sd, ...} ls =>
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244 sd <- signal sd;
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245 if sd then
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246 row <- signal rowS;
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247 return (row :: ls)
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248 else
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249 return ls) [] grid.Rows
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250 end
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