eclipseprojects/eu.etaxonomy.taxeditor/src/eu/etaxonomy/taxeditor/view/propertysheetsupport/PropertySheetValueEditingSupport.java

   1 package eu.etaxonomy.taxeditor.view.propertysheetsupport;
   2
   3 import java.util.TreeMap;
   4
   5 import org.eclipse.core.databinding.DataBindingContext;
   6 import org.eclipse.core.databinding.UpdateValueStrategy;
   7 import org.eclipse.core.databinding.observable.value.IObservableValue;
   8 import org.eclipse.core.runtime.Assert;
   9 import org.eclipse.jface.databinding.swt.SWTObservables;
  10 import org.eclipse.jface.viewers.CellEditor;
  11 import org.eclipse.jface.viewers.EditingSupport;
  12 import org.eclipse.jface.viewers.TextCellEditor;
  13 import org.eclipse.jface.viewers.ViewerCell;
  14 import org.eclipse.swt.SWT;
  15
  16 import eu.etaxonomy.taxeditor.model.PropertySheetNode;
  17 import eu.etaxonomy.taxeditor.view.PropertySheetViewer;
  18
  19 public class PropertySheetValueEditingSupport extends EditingSupport {
  20
  21         private TreeMap<String,CellEditor> cellEditors;
  22         private PropertySheetViewer viewer;
  23         private DataBindingContext bindingContext;
  24
  25         public PropertySheetValueEditingSupport(PropertySheetViewer viewer) {
  26                 super(viewer);
  27                 this.viewer = viewer;
  28                 this.bindingContext = viewer.getBindingContext();
  29                 this.cellEditors = new TreeMap<String, CellEditor>();
  30         }
  31
  32         protected boolean canEdit(Object element) {
  33                 return ((PropertySheetNode) element).isEditable();
  34         }
  35
  36         protected CellEditor getCellEditor(Object element) {
  37                 String elementString = element.toString();
  38                 if (cellEditors.get(elementString) == null)
  39                         cellEditors.put(elementString, new TextCellEditor(viewer.getTree()));
  40                 return cellEditors.get(elementString);
  41         }
  42
  43         protected Object getValue(Object element) {
  44                 return (PropertySheetNode) element;
  45         }
  46
  47         protected void setValue(Object element, Object value) {
  48                 ((PropertySheetNode) element).setPropertyValue(value.toString());
  49                 this.getViewer().update(element, null);
  50         }
  51
  52         protected void initializeCellEditorValue(CellEditor cellEditor, ViewerCell cell) {
  53                 PropertySheetNode node = (PropertySheetNode) getValue(cell.getElement());
  54
  55                 // an empty string instead of a null makes the field editable
  56                 cellEditor.setValue(node.getPropertyValue() == null ? "" : node.getPropertyValue());
  57
  58                 // if node element is observing a value, bind it to its TreeItem
  59                 IObservableValue observeNodeValue = node.getObserveValue();
  60                 if (observeNodeValue != null) {
  61
  62                 Assert.isNotNull(bindingContext,
  63                 "Editing support: PropertySheetViewer's binding context must be explicitly set.");
  64
  65                         IObservableValue observeCellValue = SWTObservables.observeText(cellEditor.getControl(), SWT.Modify);
  66                         bindingContext.bindValue(observeNodeValue, observeCellValue,
  67                                         new UpdateValueStrategy(UpdateValueStrategy.POLICY_CONVERT), null);
  68
  69                 }
  70         }
  71 }