bundles/org.simantics.browsing.ui.swt/src/org/simantics/browsing/ui/swt/widgets/impl/ModifyComboListenerImpl.java

   1 /*******************************************************************************\r
   2  * Copyright (c) 2007, 2012 Association for Decentralized Information Management\r
   3  * in Industry THTH ry.\r
   4  * All rights reserved. This program and the accompanying materials\r
   5  * are made available under the terms of the Eclipse Public License v1.0\r
   6  * which accompanies this distribution, and is available at\r
   7  * http://www.eclipse.org/legal/epl-v10.html\r
   8  *\r
   9  * Contributors:\r
  10  *     VTT Technical Research Centre of Finland - initial API and implementation\r
  11  *******************************************************************************/\r
  12 package org.simantics.browsing.ui.swt.widgets.impl;\r
  13 \r
  14 import java.util.List;\r
  15 import java.util.Map;\r
  16 \r
  17 import org.eclipse.jface.viewers.ISelection;\r
  18 import org.eclipse.swt.events.ModifyEvent;\r
  19 import org.eclipse.swt.events.ModifyListener;\r
  20 import org.simantics.browsing.ui.swt.widgets.Combo;\r
  21 import org.simantics.db.WriteGraph;\r
  22 import org.simantics.db.common.request.WriteRequest;\r
  23 import org.simantics.db.exception.DatabaseException;\r
  24 import org.simantics.db.management.ISessionContext;\r
  25 import org.simantics.utils.ReflectionUtils;\r
  26 import org.simantics.utils.datastructures.Pair;\r
  27 import org.simantics.utils.ui.ISelectionUtils;\r
  28 \r
  29 abstract public class ModifyComboListenerImpl<T, S> implements ModifyListener, Widget {\r
  30 \r
  31         private ISessionContext context;\r
  32         private Object lastInput = null;\r
  33         \r
  34     final private Class<?> clazz;\r
  35         \r
  36         public ModifyComboListenerImpl() {\r
  37         clazz = ReflectionUtils.getSingleParameterType(getClass());\r
  38         }\r
  39         \r
  40         private Object getInputContents(Object input, Class<?> inputClass) {\r
  41 \r
  42                 if(inputClass.isInstance(input)) return input;\r
  43                 \r
  44                 if(input instanceof ISelection) {\r
  45                         return ISelectionUtils.filterSingleSelection((ISelection)input, inputClass);\r
  46                 } else {\r
  47                         return null;\r
  48                 }\r
  49                 \r
  50         }\r
  51         \r
  52         @SuppressWarnings("unchecked")\r
  53     @Override\r
  54         public void modifyText(ModifyEvent e) {\r
  55                 \r
  56                 Combo combo = (Combo)e.widget.getData("org.simantics.browsing.ui.widgets.Combo");\r
  57                 \r
  58                 int selectionIndex = combo.getWidget().getSelectionIndex();\r
  59                 if (selectionIndex == -1)\r
  60                     return;\r
  61 \r
  62                 String[] items = combo.getWidget().getItems();\r
  63                 \r
  64                 String key = items[selectionIndex];\r
  65                 final Object input = lastInput;\r
  66                 \r
  67                 if(e.widget.getData() instanceof List) {\r
  68 \r
  69                         List<Pair<String, Object>> data = (List<Pair<String, Object>>) e.widget.getData();\r
  70                         Pair<String, Object> pair = data.get(selectionIndex);\r
  71                         final Object o = pair.second;\r
  72                         \r
  73                         try {\r
  74                                 context.getSession().syncRequest(new WriteRequest() {\r
  75 \r
  76                                         @Override\r
  77                                         public void perform(WriteGraph graph) throws DatabaseException {\r
  78 \r
  79                                                 T single = (T)getInputContents(input, clazz);\r
  80                                                 applySelection(graph, single, (S)o);\r
  81                                                 \r
  82                                         }\r
  83                                         \r
  84                                 });\r
  85                         } catch (DatabaseException e1) {\r
  86                                 e1.printStackTrace();\r
  87                         }\r
  88                         \r
  89                 } else if (e.widget.getData() instanceof Map) {\r
  90                         \r
  91                         Map<String, Object> data = (Map<String, Object>) e.widget.getData();\r
  92                         final Object o = data.get(key);\r
  93                         \r
  94                         try {\r
  95                                 context.getSession().syncRequest(new WriteRequest() {\r
  96 \r
  97                                         @Override\r
  98                                         public void perform(WriteGraph graph) throws DatabaseException {\r
  99 \r
 100                                                 T single = (T)getInputContents(input, clazz);\r
 101                                                 applySelection(graph, single, (S)o);\r
 102                                                 \r
 103                                         }\r
 104                                         \r
 105                                 });\r
 106                         } catch (DatabaseException e1) {\r
 107                                 e1.printStackTrace();\r
 108                         }\r
 109                         \r
 110                 }\r
 111                 \r
 112         }\r
 113 \r
 114         @Override\r
 115         public void setInput(ISessionContext context, Object parameter) {\r
 116                 this.context = context;\r
 117                 lastInput = parameter;\r
 118         }\r
 119         \r
 120         abstract public void applySelection(WriteGraph graph, T input, S selection) throws DatabaseException;\r
 121         \r
 122 }\r
 123