mcs/class/System.Design/System.Web.UI.Design.WebControls/BaseDataListDesigner.cs

   1
   2 //
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   4 // a copy of this software and associated documentation files (the
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   8 // permit persons to whom the Software is furnished to do so, subject to
   9 // the following conditions:
  10 //
  11 // The above copyright notice and this permission notice shall be
  12 // included in all copies or substantial portions of the Software.
  13 //
  14 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  15 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  16 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  17 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  18 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  19 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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  21 //
  22 /**
  23  * Namespace:   System.Web.UI.Design.WebControls
  24  * Class:       BaseDataListDesigner
  25  *
  26  * Author:      Gaurav Vaish
  27  * Maintainer:  mastergaurav AT users DOT sf DOT net
  28  *
  29  * (C) Gaurav Vaish (2002)
  30  */
  31
  32 using System;
  33 using System.Collections;
  34 using System.ComponentModel;
  35 using System.ComponentModel.Design;
  36 using System.Reflection;
  37 using System.Web.UI.Design;
  38 using System.Web.UI;
  39 using System.Web.UI.WebControls;
  40 using System.Data;
  41
  42 namespace System.Web.UI.Design.WebControls
  43 {
  44         public abstract class BaseDataListDesigner : TemplatedControlDesigner,
  45                                                      IDataSourceProvider
  46         {
  47                 private BaseDataList baseDataList;
  48                 private DataTable    desTimeDataTable;
  49                 private DataTable    dummyDataTable;
  50
  51                 private static readonly string[] validNames = new string[] {
  52                         "AlternatingItemStyle",
  53                         "BackColor",
  54                         "DataSource",
  55                         "DataMember",
  56                         "EditItemStyle",
  57                         "Font",
  58                         "ForeColor",
  59                         "HeaderStyle",
  60                         "FooterStyle",
  61                         "ItemStyle",
  62                         "SelectedItemStyle",
  63                         "SeparatorStyle"
  64                 };
  65
  66                 public BaseDataListDesigner()
  67                 {
  68                 }
  69
  70                 public string DataKeyField
  71                 {
  72                         get
  73                         {
  74                                 return baseDataList.DataKeyField;
  75                         }
  76                         set
  77                         {
  78                                 baseDataList.DataKeyField = value;
  79                         }
  80                 }
  81
  82                 public string DataMember
  83                 {
  84                         get
  85                         {
  86                                 return baseDataList.DataMember;
  87                         }
  88                         set
  89                         {
  90                                 baseDataList.DataMember = value;
  91                         }
  92                 }
  93
  94                 public string DataSource
  95                 {
  96                         get
  97                         {
  98                                 DataBinding element = DataBindings["DataSource"];
  99                                 if(element != null)
 100                                 {
 101                                         return element.Expression;
 102                                 }
 103                                 return String.Empty;
 104                         }
 105                         set
 106                         {
 107                                 if(value == null && value.Length == 0)
 108                                 {
 109                                         DataBindings.Remove("DataSource");
 110                                 } else
 111                                 {
 112                                         DataBinding element = DataBindings["DataSource"];
 113                                         if(element == null)
 114                                         {
 115                                                 element = new DataBinding("DataSource",
 116                                                                           typeof(IEnumerable),
 117                                                                           value);
 118                                         } else
 119                                         {
 120                                                 element.Expression = value;
 121                                         }
 122                                         DataBindings.Add(element);
 123                                 }
 124                                 OnDataSourceChanged();
 125                                 OnBindingsCollectionChanged("DataSource");
 126                         }
 127                 }
 128
 129                 protected internal virtual void OnDataSourceChanged()
 130                 {
 131                         desTimeDataTable = null;
 132                 }
 133
 134                 public override bool DesignTimeHtmlRequiresLoadComplete
 135                 {
 136                         get
 137                         {
 138                                 return (DataSource.Length > 0);
 139                         }
 140                 }
 141
 142                 public override DesignerVerbCollection Verbs
 143                 {
 144                         get
 145                         {
 146                                 throw new NotImplementedException();
 147                         }
 148                 }
 149
 150                 public object GetSelectedDataSource()
 151                 {
 152                         object retVal = null;
 153                         DataBinding element = DataBindings["DataSource"];
 154                         if(element != null)
 155                         {
 156                                 retVal = DesignTimeData.GetSelectedDataSource(baseDataList,
 157                                                                        element.Expression);
 158                         }
 159                         return retVal;
 160                 }
 161
 162                 public IEnumerable GetResolvedSelectedDataSource()
 163                 {
 164                         IEnumerable retVal = null;
 165                         DataBinding element = DataBindings["DataSource"];
 166                         if(element != null)
 167                         {
 168                                 retVal = DesignTimeData.GetSelectedDataSource(baseDataList,
 169                                                                         element.Expression,
 170                                                                         DataMember);
 171                         }
 172                         return retVal;
 173                 }
 174
 175                 public override IEnumerable GetTemplateContainerDataSource(
 176                                                                string templateName)
 177                 {
 178                         return GetResolvedSelectedDataSource();
 179                 }
 180
 181                 public override void Initialize(IComponent component)
 182                 {
 183                         baseDataList = (BaseDataList)component;
 184                         base.Initialize(component);
 185                 }
 186
 187                 public override void OnComponentChanged(object sender,
 188                                                         ComponentChangedEventArgs e)
 189                 {
 190                         if(e.Member != null)
 191                         {
 192                                 string name = e.Member.Name;
 193                                 foreach(string current in validNames)
 194                                 {
 195                                         if(name == current)
 196                                         {
 197                                                 OnStylesChanged();
 198                                                 break;
 199                                         }
 200                                 }
 201                         }
 202                         base.OnComponentChanged(sender, e);
 203                 }
 204
 205                 protected internal void OnStylesChanged()
 206                 {
 207                         OnTemplateEditingVerbsChanged();
 208                 }
 209
 210                 protected abstract void OnTemplateEditingVerbsChanged();
 211
 212                 protected override void Dispose(bool disposing)
 213                 {
 214                         if(disposing)
 215                                 baseDataList = null;
 216                         base.Dispose(disposing);
 217                 }
 218
 219                 protected IEnumerable GetDesignTimeDataSource(int minimumRows,
 220                                                       out bool dummyDataSource)
 221                 {
 222                         return GetDesignTimeDataSource(GetResolvedSelectedDataSource(),
 223                                                        minimumRows,
 224                                                        out dummyDataSource);
 225                 }
 226
 227                 protected IEnumerable GetDesignTimeDataSource(IEnumerable selectedDataSource,
 228                                                               int minimumRows,
 229                                                               out bool dummyDataSource)
 230                 {
 231                         DataTable toDeploy = desTimeDataTable;
 232                         dummyDataSource = false;
 233                         if(minimumRows == 0)
 234                         {
 235                                 if(selectedDataSource != null)
 236                                 {
 237                                         desTimeDataTable = DesignTimeData.CreateSampleDataTable(
 238                                                                           selectedDataSource);
 239                                         toDeploy = desTimeDataTable;
 240                                 }
 241                                 if(toDeploy == null)
 242                                 {
 243                                         if(dummyDataTable == null)
 244                                                 dummyDataTable = DesignTimeData.CreateDummyDataTable();
 245                                         toDeploy = dummyDataTable;
 246                                         dummyDataSource = true;
 247                                 }
 248                         }
 249                         return DesignTimeData.GetDesignTimeDataSource(toDeploy, minimumRows);
 250                 }
 251         }
 252 }