plugins/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.graphics.Color;
   8 import org.eclipse.swt.widgets.Composite;
   9 import org.eclipse.swt.widgets.Display;
  10 import org.eclipse.swt.widgets.Table;
  11
  12 public class LazyTableViewer extends TableViewer
  13 {
  14         public static Color highlightColor = Display.getDefault().getSystemColor(SWT.COLOR_YELLOW);
  15
  16         public LazyTableViewer(Composite parent, int style)
  17         {
  18                 super(parent, style | SWT.VIRTUAL);
  19         }
  20
  21         public LazyTableViewer(Composite parent)
  22         {
  23                 super(parent);
  24         }
  25
  26         public LazyTableViewer(Table table)
  27         {
  28                 super(table);
  29         }
  30
  31         public void highlightRow(int index, boolean highlight)
  32         {
  33                 Table table = getTable();
  34                 if (index < 0 || index >= table.getItemCount())
  35                         return;
  36                 table.getItem(index).setBackground(highlight ? highlightColor : table.getBackground());
  37                 ((ILazyContentProvider) getContentProvider()).updateElement(index);
  38         }
  39
  40         @Override
  41         public void setContentProvider(IContentProvider provider)
  42         {
  43                 if (!(provider instanceof ILazyContentProvider))
  44                         throw new IllegalArgumentException("Content provider must be an ILazyContentProvider");
  45                 super.setContentProvider(provider);
  46         }
  47
  48         @Override
  49         public void refresh()
  50         {
  51                 Table t = getTable();
  52                 ILazyContentProvider provider = (ILazyContentProvider) getContentProvider();
  53                 doClearAll();
  54                 int startIndex = t.getTopIndex();
  55                 int numRows = t.getBounds().height / t.getItemHeight();
  56                 int endIndex = Integer.min(startIndex + numRows + 5, doGetItemCount());
  57
  58                 for (int i = startIndex; i < endIndex; i++)
  59                 {
  60                         provider.updateElement(i);
  61                 }
  62         }
  63 }