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