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