plugins/net.mograsim.plugin.core/src/net/mograsim/plugin/tables/memory/MemoryTableContentProvider.java

   1 package net.mograsim.plugin.tables.memory;
   2
   3 import org.eclipse.jface.viewers.ILazyContentProvider;
   4 import org.eclipse.jface.viewers.TableViewer;
   5 import org.eclipse.jface.viewers.Viewer;
   6 import org.eclipse.swt.widgets.Display;
   7
   8 import net.mograsim.machine.MainMemory;
   9 import net.mograsim.machine.Memory.MemoryCellModifiedListener;
  10
  11 public class MemoryTableContentProvider implements ILazyContentProvider, MemoryCellModifiedListener
  12 {
  13         private long lower;
  14         private TableViewer viewer;
  15         private final static int limit = 10_000;
  16         private int amount = 0;
  17         private MainMemory memory;
  18
  19         public void setLowerBound(long lower)
  20         {
  21                 if (memory != null)
  22                         this.lower = Long.min(memory.getDefinition().getMaximalAddress(), Long.max(memory.getDefinition().getMinimalAddress(), lower));
  23                 else
  24                         this.lower = lower;
  25                 updateItemCount();
  26         }
  27
  28         public void updateItemCount()
  29         {
  30                 if (viewer != null)
  31                         if (memory != null)
  32                         {
  33                                 long size = memory.getDefinition().getMaximalAddress() - lower;
  34                                 viewer.setItemCount(size > amount ? amount : (int) size);
  35                         } else
  36                                 viewer.setItemCount(0);
  37         }
  38
  39         public long getLowerBound()
  40         {
  41                 return lower;
  42         }
  43
  44         public void setAmount(int amount)
  45         {
  46                 this.amount = Integer.min(amount, limit);
  47                 updateItemCount();
  48         }
  49
  50         public int getAmount()
  51         {
  52                 return amount;
  53         }
  54
  55         @Override
  56         public void updateElement(int index)
  57         {
  58                 if (index < amount)
  59                 {
  60                         long address = lower + index;
  61                         if (address <= memory.getDefinition().getMaximalAddress())
  62                                 viewer.replace(new MemoryTableRow(address, memory), index);
  63                 }
  64         }
  65
  66         @Override
  67         public void inputChanged(Viewer viewer, Object oldInput, Object newInput)
  68         {
  69                 this.viewer = (TableViewer) viewer;
  70                 this.memory = (MainMemory) newInput;
  71                 if (oldInput != null)
  72                         ((MainMemory) oldInput).deregisterCellModifiedListener(this);
  73                 if (memory != null)
  74                         memory.registerCellModifiedListener(this);
  75                 setLowerBound(0L);
  76         }
  77
  78         @Override
  79         public void update(long address)
  80         {
  81                 // TODO check if viewer.refresh() does what we expect
  82                 Display.getDefault().asyncExec(address == -1 ? viewer::refresh : () -> updateElement((int) (address - lower)));
  83         }
  84 }