bundles/org.simantics.document.swt.core/src/org/simantics/document/swt/core/widget/ComboWidget.java

   1 package org.simantics.document.swt.core.widget;
   2
   3 import java.util.Arrays;
   4 import java.util.List;
   5
   6 import org.eclipse.swt.SWT;
   7 import org.eclipse.swt.events.ModifyEvent;
   8 import org.eclipse.swt.events.ModifyListener;
   9 import org.eclipse.swt.widgets.Combo;
  10 import org.eclipse.swt.widgets.Composite;
  11 import org.simantics.document.server.JSONObject;
  12 import org.simantics.document.server.handler.AbstractEventHandler;
  13 import org.simantics.document.server.io.CommandContextImpl;
  14 import org.simantics.document.swt.core.SWTDocument;
  15 import org.simantics.document.swt.core.base.LeafWidgetManager;
  16 import org.simantics.document.swt.core.bean.StringList;
  17
  18 public class ComboWidget extends LeafWidgetManager<Combo> {
  19
  20         private ModifyListener modifyListener = null;
  21
  22         private StringList extractAvailable(Object o) {
  23                 if(o == null) return new StringList(new String[0]);
  24                 if(o instanceof StringList) return (StringList)o;
  25                 if(o instanceof List) return new StringList((List)o);
  26                 if(o instanceof String[]) return new StringList((String[])o);
  27                 throw new IllegalArgumentException("Unaccepted format for available " + o.getClass().getName());
  28         }
  29
  30         @Override
  31         protected void doUpdateProperties(SWTDocument document, Combo combo, JSONObject object) {
  32
  33                 if(combo.isDisposed()) return;
  34
  35                 if(modifyListener != null)
  36                         combo.removeModifyListener(modifyListener);
  37
  38                 StringList availableList = extractAvailable(object.getJSONField("available"));
  39                 String selected = object.getJSONField("selected");
  40
  41                 String[] available = availableList.strings;
  42                 String[] current = combo.getItems();
  43
  44                 if(!Arrays.equals(available, current)) {
  45                 combo.clearSelection();
  46                 combo.removeAll();
  47                 for(String key : available) {
  48                         combo.add(key);
  49                 }
  50                 }
  51
  52                 int index = 0;
  53                 for(;index<available.length;index++) if(available[index].equals(selected)) break;
  54
  55                 if(index == available.length) {
  56                         combo.clearSelection();
  57                 } else {
  58                         combo.select(index);
  59                 }
  60
  61                 if(modifyListener != null)
  62                         combo.addModifyListener(modifyListener);
  63
  64         }
  65
  66         @Override
  67         protected Combo doCreateControl(final SWTDocument document, Composite parent, JSONObject object) {
  68                 final Combo combo = new Combo(parent, SWT.READ_ONLY);
  69                 final AbstractEventHandler onModify = object.getJSONField("onModify");
  70                 if(onModify != null) {
  71                         modifyListener = new ModifyListener() {
  72
  73                                 @Override
  74                                 public void modifyText(ModifyEvent e) {
  75                                         String[] items = combo.getItems();
  76                                         int index = combo.getSelectionIndex();
  77                                         if(index >=0 && index < items.length) {
  78                                 CommandContextImpl parameters = new CommandContextImpl();
  79                                 parameters.putString("selected", items[index]);
  80                                                 document.post(onModify, parameters);
  81                                         }
  82
  83                                 }
  84
  85                         };
  86                         combo.addModifyListener(modifyListener);
  87                 }
  88                 return combo;
  89         }
  90
  91 }