eclipseprojects/eu.etaxonomy.taxeditor.prototype2/src/eu/etaxonomy/taxeditor/prototype2/view/propertysheetsupport/PropertySheetValueLabelProvider.java

   1 package eu.etaxonomy.taxeditor.prototype2.view.propertysheetsupport;
   2
   3 import org.eclipse.core.databinding.DataBindingContext;
   4 import org.eclipse.core.databinding.beans.BeansObservables;
   5 import org.eclipse.core.databinding.observable.value.IObservableValue;
   6 import org.eclipse.core.runtime.Assert;
   7 import org.eclipse.jface.viewers.ColumnLabelProvider;
   8 import org.eclipse.jface.viewers.ViewerCell;
   9 import org.eclipse.swt.graphics.Image;
  10 import org.eclipse.swt.widgets.TreeItem;
  11
  12 import eu.etaxonomy.taxeditor.prototype2.model.PropertySheetNode;
  13 import eu.etaxonomy.taxeditor.prototype2.view.PropertySheetViewer;
  14
  15 /**
  16  *
  17  * Borrowed from tomson <tom.schindl@bestsolution.at>'s GenericObservableMapCellLabelProvider
  18  *
  19  * @author p.ciardelli
  20  *
  21  */
  22 public class PropertySheetValueLabelProvider extends ColumnLabelProvider {
  23
  24         private DataBindingContext bindingContext;
  25
  26         public PropertySheetValueLabelProvider(PropertySheetViewer viewer) {
  27                 this.bindingContext = viewer.getBindingContext();
  28         }
  29
  30         public Image getImage(Object element) {
  31                 return null;
  32         }
  33
  34         public String getText(Object element) {
  35                 return (String) ((PropertySheetNode) element).getPropertyValue();
  36         }
  37
  38         public void update(ViewerCell cell) {
  39
  40                 Object element = cell.getElement();
  41                 cell.setText(getText(element));
  42                 Image image = getImage(element);
  43                 cell.setImage(image);
  44                 cell.setBackground(getBackground(element));
  45                 cell.setForeground(getForeground(element));
  46                 cell.setFont(getFont(element));
  47
  48                 // if node element is observing a value, bind it to its TreeItem
  49                 IObservableValue observeNodeValue = ((PropertySheetNode) element).getObserveValue();
  50                 if (observeNodeValue != null) {
  51
  52                 Assert.isNotNull(bindingContext,
  53                     "Label provider: PropertySheetViewer's binding context must be explicitly set.");
  54
  55                 TreeItemColumnBean itemColumn = new TreeItemColumnBean((TreeItem) cell.getItem(),1);
  56                         IObservableValue observeCellValue = BeansObservables.observeValue(itemColumn, "text");
  57                         bindingContext.bindValue(observeCellValue, observeNodeValue, null, null);
  58                 }
  59         }
  60
  61         /**
  62          * TreeItem returns column texts by index, i.e. getText(1) - this is a wrapper which
  63          *  allows BeansObservables to observe value with getText / setText
  64          **/
  65         class TreeItemColumnBean {
  66
  67                 TreeItem item;
  68                 int index;
  69
  70                 TreeItemColumnBean(TreeItem item, int index) {
  71                         this.item = item;
  72                         this.index = index;
  73                 }
  74
  75                 public String getText() {
  76                         return item.getText(index);
  77                 }
  78
  79                 public void setText(String string) {
  80                         item.setText(index, string);
  81                 }
  82         }
  83 }