net.mograsim.plugin.core/src/net/mograsim/plugin/tables/LazyTableViewer.java

   1 package net.mograsim.plugin.tables;
   2
   3 import org.eclipse.jface.viewers.IContentProvider;
   4 import org.eclipse.jface.viewers.ILazyContentProvider;
   5 import org.eclipse.jface.viewers.TableViewer;
   6 import org.eclipse.swt.SWT;
   7 import org.eclipse.swt.widgets.Composite;
   8 import org.eclipse.swt.widgets.Table;
   9
  10 public class LazyTableViewer extends TableViewer
  11 {
  12
  13         public LazyTableViewer(Composite parent, int style)
  14         {
  15                 super(parent, style | SWT.VIRTUAL);
  16         }
  17
  18         public LazyTableViewer(Composite parent)
  19         {
  20                 super(parent);
  21         }
  22
  23         public LazyTableViewer(Table table)
  24         {
  25                 super(table);
  26         }
  27
  28         @Override
  29         public void setContentProvider(IContentProvider provider)
  30         {
  31                 if (!(provider instanceof ILazyContentProvider))
  32                         throw new IllegalArgumentException("Content provider must be an ILazyContentProvider");
  33                 super.setContentProvider(provider);
  34         }
  35
  36         public void refreshLazy()
  37         {
  38                 Table t = getTable();
  39                 ILazyContentProvider provider = (ILazyContentProvider) getContentProvider();
  40                 doClearAll();
  41                 int startIndex = t.getTopIndex();
  42                 int numRows = t.getBounds().height / t.getItemHeight();
  43                 int endIndex = startIndex + numRows + 5;
  44
  45                 for (int i = startIndex; i < endIndex; i++)
  46                 {
  47                         provider.updateElement(i);
  48                 }
  49         }
  50 }