plugins/net.mograsim.plugin.core/src/net/mograsim/plugin/tables/mi/ActiveInstructionPreviewContentProvider.java

   1 package net.mograsim.plugin.tables.mi;
   2
   3 import org.eclipse.jface.viewers.TableViewer;
   4 import org.eclipse.jface.viewers.Viewer;
   5
   6 import net.mograsim.machine.mi.MicroInstructionMemory;
   7 import net.mograsim.machine.mi.MicroInstructionMemory.ActiveMicroInstructionChangedListener;
   8
   9 public class ActiveInstructionPreviewContentProvider implements InstructionTableContentProvider, ActiveMicroInstructionChangedListener
  10 {
  11         private TableViewer viewer;
  12         private MicroInstructionMemory memory;
  13         private InstructionTableRow activeRow;
  14
  15         public ActiveInstructionPreviewContentProvider(TableViewer viewer)
  16         {
  17                 this.viewer = viewer;
  18                 viewer.setItemCount(1);
  19         }
  20
  21         @Override
  22         public void activeMicroInstructionChanged(long address)
  23         {
  24                 this.activeRow = new InstructionTableRow(address, memory);
  25                 viewer.refresh();
  26         }
  27
  28         @Override
  29         public void update(long address)
  30         {
  31                 // Nothing to do here
  32         }
  33
  34         @Override
  35         public void inputChanged(Viewer viewer, Object oldInput, Object newInput)
  36         {
  37                 if (oldInput != null)
  38                         ((MicroInstructionMemory) oldInput).deregisterActiveMicroInstructionChangedListener(this);
  39
  40                 memory = (MicroInstructionMemory) newInput;
  41                 if (memory != null)
  42                 {
  43                         activeMicroInstructionChanged(0);
  44                         memory.registerActiveMicroInstructionChangedListener(this);
  45                 }
  46         }
  47
  48         @Override
  49         public void updateElement(int index)
  50         {
  51                 viewer.replace(activeRow, index);
  52         }
  53 }