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   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.MainMemoryDefinition;
  10 import net.mograsim.machine.Memory.MemoryCellModifiedListener;
  11
  12 public class MemoryTableContentProvider implements ILazyContentProvider, MemoryCellModifiedListener
  13 {
  14         private long lower, upper;
  15         private TableViewer viewer;
  16         public final static int MAX_VISIBLE_ROWS = 1_000;
  17         private MainMemory memory;
  18
  19         public void setBounds(long lower, long upper)
  20         {
  21                 if (memory != null)
  22                 {
  23                         MainMemoryDefinition definition = memory.getDefinition();
  24                         this.lower = Long.min(definition.getMaximalAddress(), Long.max(definition.getMinimalAddress(), lower));
  25                         this.upper = Long.max(this.lower, Long.min(definition.getMaximalAddress(), upper));
  26                 } else
  27                 {
  28                         this.lower = lower;
  29                         this.upper = Long.max(this.lower, upper);
  30                 }
  31                 updateItemCount();
  32         }
  33
  34         public void updateItemCount()
  35         {
  36                 if (viewer != null)
  37                         viewer.setItemCount(getAmount());
  38         }
  39
  40         public long getLowerBound()
  41         {
  42                 return lower;
  43         }
  44
  45         public long getUpperBound()
  46         {
  47                 return upper;
  48         }
  49
  50         public int getAmount()
  51         {
  52                 return (int) (upper - lower);
  53         }
  54
  55         @Override
  56         public void updateElement(int index)
  57         {
  58                 if (index < getAmount())
  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                 setBounds(0, MAX_VISIBLE_ROWS);
  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 }