eclipse/org.argeo.cms.swt/src/org/argeo/cms/swt/widgets/SwtHierarchicalPart.java

   1 package org.argeo.cms.swt.widgets;
   2
   3 import java.util.function.Consumer;
   4
   5 import org.argeo.cms.swt.CmsSwtUtils;
   6 import org.argeo.cms.ux.widgets.HierarchicalPart;
   7 import org.eclipse.swt.SWT;
   8 import org.eclipse.swt.events.SelectionEvent;
   9 import org.eclipse.swt.events.SelectionListener;
  10 import org.eclipse.swt.widgets.Composite;
  11 import org.eclipse.swt.widgets.Tree;
  12 import org.eclipse.swt.widgets.TreeItem;
  13
  14 /** {@link HierarchicalPart} implementation based on a {@link Tree}. */
  15 public class SwtHierarchicalPart extends Composite implements HierarchicalPart {
  16         private static final long serialVersionUID = -2189742596757101778L;
  17
  18         private final Tree tree;
  19
  20         private Consumer<Object> onSelected;
  21         private Consumer<Object> onAction;
  22
  23         public SwtHierarchicalPart(Composite parent, int style) {
  24                 super(parent, style);
  25                 setLayout(CmsSwtUtils.noSpaceGridLayout());
  26                 tree = new Tree(this, SWT.VIRTUAL | SWT.BORDER);
  27         }
  28
  29         public void refresh() {
  30                 tree.addListener(SWT.SetData, event -> {
  31                         TreeItem item = (TreeItem) event.item;
  32                         TreeItem parentItem = item.getParentItem();
  33                         if (parentItem == null) {
  34                                 refreshRootItem(item);
  35                         } else {
  36                                 refreshItem(parentItem, parentItem);
  37                         }
  38                 });
  39                 tree.setItemCount(getRootItemCount());
  40                 CmsSwtUtils.fill(tree);
  41
  42                 tree.addSelectionListener(new SelectionListener() {
  43
  44                         private static final long serialVersionUID = 4334785560035009330L;
  45
  46                         @Override
  47                         public void widgetSelected(SelectionEvent e) {
  48                                 onSelected.accept(e.item.getData());
  49                         }
  50
  51                         @Override
  52                         public void widgetDefaultSelected(SelectionEvent e) {
  53                                 onAction.accept(e.item.getData());
  54                         }
  55                 });
  56
  57         }
  58
  59         protected void refreshRootItem(TreeItem item) {
  60
  61         }
  62
  63         protected void refreshItem(TreeItem parentItem, TreeItem item) {
  64
  65         }
  66
  67         protected int getRootItemCount() {
  68                 return 0;
  69         }
  70
  71         protected Tree getTree() {
  72                 return tree;
  73         }
  74
  75         public void onSelected(Consumer<Object> onSelected) {
  76                 this.onSelected = onSelected;
  77         }
  78
  79         public void onAction(Consumer<Object> onAction) {
  80                 this.onAction = onAction;
  81         }
  82
  83 }