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 implements HierarchicalPart {
  16         private Composite area;
  17         private final Tree tree;
  18
  19         private Consumer<Object> onSelected;
  20         private Consumer<Object> onAction;
  21
  22         public SwtHierarchicalPart(Composite parent, int style) {
  23                 area = new Composite(parent, style);
  24                 area.setLayout(CmsSwtUtils.noSpaceGridLayout());
  25                 tree = new Tree(area, SWT.VIRTUAL | SWT.BORDER);
  26         }
  27
  28         @Override
  29         public void refresh() {
  30                 // TODO optimise
  31                 tree.clearAll(true);
  32                 tree.addListener(SWT.SetData, event -> {
  33                         TreeItem item = (TreeItem) event.item;
  34                         TreeItem parentItem = item.getParentItem();
  35                         if (parentItem == null) {
  36                                 refreshRootItem(item);
  37                         } else {
  38                                 refreshItem(parentItem, item);
  39                         }
  40                 });
  41                 tree.setItemCount(getRootItemCount());
  42                 CmsSwtUtils.fill(tree);
  43
  44                 tree.addSelectionListener(new SelectionListener() {
  45
  46                         private static final long serialVersionUID = 4334785560035009330L;
  47
  48                         @Override
  49                         public void widgetSelected(SelectionEvent e) {
  50                                 if (onSelected != null)
  51                                         onSelected.accept(e.item.getData());
  52                         }
  53
  54                         @Override
  55                         public void widgetDefaultSelected(SelectionEvent e) {
  56                                 if (onAction != null)
  57                                         onAction.accept(e.item.getData());
  58                         }
  59                 });
  60
  61         }
  62
  63         @Override
  64         public void setInput(Object data) {
  65                 area.setData(data);
  66                 refresh();
  67         }
  68
  69         @Override
  70         public Object getInput() {
  71                 return area.getData();
  72         }
  73
  74         protected void refreshRootItem(TreeItem item) {
  75
  76         }
  77
  78         protected void refreshItem(TreeItem parentItem, TreeItem item) {
  79
  80         }
  81
  82         protected int getRootItemCount() {
  83                 return 0;
  84         }
  85
  86         protected Tree getTree() {
  87                 return tree;
  88         }
  89
  90         public void onSelected(Consumer<Object> onSelected) {
  91                 this.onSelected = onSelected;
  92         }
  93
  94         public void onAction(Consumer<Object> onAction) {
  95                 this.onAction = onAction;
  96         }
  97
  98         public Composite getArea() {
  99                 return area;
 100         }
 101
 102 }