bundles/org.simantics.browsing.ui.swt/src/org/simantics/browsing/ui/swt/widgets/impl/WidgetSupportImpl.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.HashMap;\r
  15 import java.util.List;\r
  16 import java.util.Map;\r
  17 import java.util.concurrent.CopyOnWriteArrayList;\r
  18 \r
  19 import org.simantics.db.ReadGraph;\r
  20 import org.simantics.db.common.request.ParametrizedPrimitiveRead;\r
  21 import org.simantics.db.exception.DatabaseException;\r
  22 import org.simantics.db.management.ISessionContext;\r
  23 import org.simantics.db.procedure.Listener;\r
  24 \r
  25 public class WidgetSupportImpl implements WidgetSupport {\r
  26 \r
  27         final protected CopyOnWriteArrayList<Widget> widgets = new CopyOnWriteArrayList<Widget>();\r
  28         final protected Map<String, Object> parameters = new HashMap<String, Object>();\r
  29         protected Object lastInput = NO_INPUT;\r
  30         protected ISessionContext lastContext = null;\r
  31         private boolean finished = false;\r
  32 \r
  33         final protected List<Listener<?>> listeners = new CopyOnWriteArrayList<Listener<?>>();\r
  34         \r
  35         @Override\r
  36         public synchronized void register(Widget widget) {\r
  37                 widgets.add(widget);\r
  38         }\r
  39         \r
  40         @Override\r
  41         public void update(Widget widget) {\r
  42                 if(lastContext != null && lastInput != NO_INPUT) widget.setInput(lastContext, lastInput);\r
  43         }\r
  44 \r
  45         @Override\r
  46         public void update() {\r
  47                 for(Widget widget : widgets) update(widget);\r
  48         }\r
  49         \r
  50         @Override\r
  51         public void finish() {\r
  52                 finished = true;\r
  53                 //for(Widget widget : widgets) update(widget);\r
  54         }\r
  55         \r
  56         @SuppressWarnings("unchecked")\r
  57         @Override\r
  58         public <T> T getInput() {\r
  59                 return (T) lastInput;\r
  60         }\r
  61         \r
  62         public void fireInput(ISessionContext context, Object input) {\r
  63                 \r
  64                 lastInput = input;\r
  65                 lastContext = context;\r
  66                 \r
  67                 for(Widget widget : widgets) {\r
  68                         widget.setInput(context, input);\r
  69                         for (Listener listener : listeners)\r
  70                                 listener.execute(input);\r
  71                 }\r
  72                 \r
  73         }\r
  74         \r
  75         @SuppressWarnings("unchecked")\r
  76         @Override\r
  77         public <T> T getParameter(String key) {\r
  78                 return (T) parameters.get(key);\r
  79         }\r
  80         \r
  81         @Override\r
  82         public void setParameter(String key, Object value) {\r
  83                 parameters.put(key, value);\r
  84         }\r
  85 \r
  86         @Override\r
  87         public <T> T getInput(ReadGraph graph) throws DatabaseException {\r
  88                 return graph.sync(new ParametrizedPrimitiveRead<WidgetSupport, T>(this) {\r
  89 \r
  90                         Listener<T> procedure;\r
  91 \r
  92                         @SuppressWarnings("unchecked")\r
  93                         @Override\r
  94                         public void register(ReadGraph graph, Listener<T> procedure) {\r
  95                                 synchronized (listeners) {\r
  96                                         if(listeners.contains(procedure))\r
  97                                                 return;\r
  98                                         this.procedure = procedure;\r
  99                                         listeners.add(procedure);\r
 100                                         procedure.execute((T)lastInput);\r
 101                                 }\r
 102                         }\r
 103 \r
 104                         @Override\r
 105                         public void unregistered() {\r
 106                                 synchronized (listeners) {\r
 107                                         listeners.remove(procedure);\r
 108                                         procedure = null;\r
 109                                 }\r
 110                         }\r
 111 \r
 112                 });\r
 113         }\r
 114         \r
 115 }\r