bundles/org.simantics.browsing.ui.swt/src/org/simantics/browsing/ui/swt/widgets/CCombo2.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;\r
  13 \r
  14 import java.util.List;\r
  15 import java.util.concurrent.CopyOnWriteArrayList;\r
  16 \r
  17 import org.eclipse.swt.events.SelectionListener;\r
  18 import org.eclipse.swt.widgets.Composite;\r
  19 import org.eclipse.swt.widgets.Control;\r
  20 import org.eclipse.swt.widgets.Display;\r
  21 import org.simantics.Simantics;\r
  22 import org.simantics.browsing.ui.swt.widgets.impl.Widget;\r
  23 import org.simantics.browsing.ui.swt.widgets.impl.WidgetSupport;\r
  24 import org.simantics.db.ReadGraph;\r
  25 import org.simantics.db.common.request.ParametrizedRead;\r
  26 import org.simantics.db.common.request.UniqueRead;\r
  27 import org.simantics.db.exception.DatabaseException;\r
  28 import org.simantics.db.management.ISessionContext;\r
  29 import org.simantics.db.procedure.Listener;\r
  30 import org.simantics.utils.datastructures.Pair;\r
  31 \r
  32 public class CCombo2 extends WidgetImpl {\r
  33 \r
  34     private final CopyOnWriteArrayList<SelectionListener> selectionListeners = new CopyOnWriteArrayList<SelectionListener>();\r
  35     private List<Pair<String, Object>> itemList;\r
  36 \r
  37     final private Display display;\r
  38     final private org.eclipse.swt.custom.CCombo combo;\r
  39 \r
  40     public CCombo2(Composite parent, WidgetSupport support, int style) {\r
  41         super(support);\r
  42         this.display = parent.getDisplay();\r
  43         combo = new org.eclipse.swt.custom.CCombo(parent, style);\r
  44         combo.setData("org.simantics.browsing.ui.widgets.Combo", this);\r
  45         support.register(this);\r
  46     }\r
  47 \r
  48     public <T> void setAvailable(final ParametrizedRead<T, List<Pair<String, Object>>> read) {\r
  49         \r
  50         Simantics.getSession().async(new UniqueRead<List<Pair<String, Object>>>() {\r
  51 \r
  52                         @Override\r
  53                         public List<Pair<String, Object>> perform(ReadGraph graph) throws DatabaseException {\r
  54                                 T input = support.getInput(graph);\r
  55                                 System.err.println("read: " + read);\r
  56                                 return graph.syncRequest(read.get(input));\r
  57                         }\r
  58                 \r
  59         }, new Listener<List<Pair<String, Object>>>() {\r
  60 \r
  61             @Override\r
  62             public void exception(Throwable t) {\r
  63                 t.printStackTrace();\r
  64             }\r
  65 \r
  66             @Override\r
  67             public void execute(final List<Pair<String, Object>> items) {\r
  68                 if(isDisposed()) return;\r
  69                 display.asyncExec(new Runnable() {\r
  70 \r
  71                     @Override\r
  72                     public void run() {\r
  73                         if(isDisposed()) return;\r
  74                         itemList = items;\r
  75                         for(SelectionListener listener : selectionListeners) combo.removeSelectionListener(listener);\r
  76                         combo.setData(items);\r
  77                         combo.clearSelection();\r
  78                         try {\r
  79                             combo.removeAll();\r
  80                         } catch (Throwable t) {\r
  81                             t.printStackTrace();\r
  82                         }\r
  83                         if (items != null) {\r
  84                             int index = 0;\r
  85                             for(Pair<String, Object> key : items) {\r
  86                                 combo.add(key.first);\r
  87                                 combo.setData(key.first, index++);\r
  88                             }\r
  89                             String selectionKey = (String)combo.getData("_SelectionKey");\r
  90                             if(selectionKey != null) {\r
  91                                 Integer selectionIndex = (Integer)combo.getData(selectionKey);\r
  92                                 if(selectionIndex != null) combo.select(selectionIndex);\r
  93                             }\r
  94                         }\r
  95                         for(SelectionListener listener : selectionListeners) combo.addSelectionListener(listener);\r
  96                     }\r
  97 \r
  98                 });\r
  99             }\r
 100 \r
 101             @Override\r
 102             public boolean isDisposed() {\r
 103                 return combo.isDisposed();\r
 104             }\r
 105 \r
 106         });\r
 107         \r
 108     }\r
 109 \r
 110     public <T> void setSelection(final ParametrizedRead<T, String> read) {\r
 111         \r
 112         Simantics.getSession().async(new UniqueRead<String>() {\r
 113 \r
 114                         @Override\r
 115                         public String perform(ReadGraph graph) throws DatabaseException {\r
 116                                 T input = support.getInput(graph);\r
 117                                 System.err.println("read: " + read);\r
 118                                 return graph.syncRequest(read.get(input));\r
 119                         }\r
 120                 \r
 121         }, new Listener<String>() {\r
 122 \r
 123             @Override\r
 124             public void exception(Throwable t) {\r
 125                 t.printStackTrace();\r
 126             }\r
 127 \r
 128             @Override\r
 129             public void execute(final String selectionKey) {\r
 130                 if(isDisposed()) return;\r
 131                 display.asyncExec(new Runnable() {\r
 132 \r
 133                     @Override\r
 134                     public void run() {\r
 135                         if(isDisposed()) return;\r
 136                         if(selectionKey == null) return;\r
 137                         for(SelectionListener listener : selectionListeners) combo.removeSelectionListener(listener);\r
 138                         combo.setData("_SelectionKey", selectionKey);\r
 139                         Integer selectionIndex = (Integer)combo.getData(selectionKey);\r
 140                         if(selectionIndex != null) combo.select(selectionIndex);\r
 141                         for(SelectionListener listener : selectionListeners) combo.addSelectionListener(listener);\r
 142                     }\r
 143 \r
 144                 });\r
 145             }\r
 146 \r
 147             @Override\r
 148             public boolean isDisposed() {\r
 149                 return combo.isDisposed();\r
 150             }\r
 151 \r
 152         });\r
 153         \r
 154     }\r
 155 \r
 156     public org.eclipse.swt.custom.CCombo getWidget() {\r
 157         return combo;\r
 158     }\r
 159 \r
 160     @Override\r
 161     public Control getControl() {\r
 162         return combo;\r
 163     }\r
 164 \r
 165     @Override\r
 166     public void setInput(ISessionContext context, Object input) {\r
 167 \r
 168         if (selectionListeners != null) {\r
 169             for (SelectionListener listener : selectionListeners) {\r
 170                 if(listener instanceof Widget) {\r
 171                     ((Widget) listener).setInput(context, input);\r
 172                 }\r
 173             }\r
 174         }\r
 175 \r
 176     }\r
 177 \r
 178     public synchronized void addSelectionListener(SelectionListener listener) {\r
 179         selectionListeners.add(listener);\r
 180         combo.addSelectionListener(listener);\r
 181     }\r
 182 \r
 183     /**\r
 184      * @param index\r
 185      * @return\r
 186      * @throws IndexOutOfBoundsException if index is outside widget bounds\r
 187      */\r
 188     @SuppressWarnings("unchecked")\r
 189     public <T> Pair<String, T> getData(int index) {\r
 190         if (index == -1)\r
 191             return null;\r
 192         return (Pair<String, T>) itemList.get(index);\r
 193     }\r
 194 \r
 195     /**\r
 196      * @return selected combo list item or <code>null</code> if no item is\r
 197      *         selected\r
 198      */\r
 199     public <T> Pair<String, T> getSelectedData() {\r
 200         return getData(combo.getSelectionIndex());\r
 201     }\r
 202 \r
 203 }\r