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

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