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.Machine;
   7 import net.mograsim.machine.Machine.ActiveMicroInstructionChangedListener;
   8 import net.mograsim.machine.mi.MicroInstructionMemory;
   9 import net.mograsim.plugin.util.SingleSWTRequest;
  10
  11 public class ActiveInstructionPreviewContentProvider implements InstructionTableContentProvider
  12 {
  13         private TableViewer viewer;
  14         private MicroInstructionMemory memory;
  15         private InstructionTableRow activeRow;
  16         private Machine machine;
  17         private SingleSWTRequest requester = new SingleSWTRequest();
  18
  19         private ActiveMicroInstructionChangedListener instChanged = (oldAddress, newAddress) ->
  20         {
  21                 activeRow = new InstructionTableRow(Long.max(0, newAddress), memory);
  22                 requester.request(() -> updateElement(0));
  23         };
  24
  25         public ActiveInstructionPreviewContentProvider(TableViewer viewer)
  26         {
  27                 this.viewer = viewer;
  28                 viewer.setItemCount(1);
  29         }
  30
  31         @Override
  32         public void update(long address)
  33         {
  34                 // Nothing to do here
  35         }
  36
  37         @Override
  38         public void inputChanged(Viewer viewer, Object oldInput, Object newInput)
  39         {
  40                 memory = (MicroInstructionMemory) newInput;
  41         }
  42
  43         public void setMachine(Machine newMachine)
  44         {
  45                 if (machine != null)
  46                         machine.removeActiveMicroInstructionChangedListener(instChanged);
  47
  48                 machine = newMachine;
  49                 if (machine != null)
  50                 {
  51                         instChanged.instructionChanged(-1, 0);
  52                         machine.addActiveMicroInstructionChangedListener(instChanged);
  53                 }
  54         }
  55
  56         @Override
  57         public void updateElement(int index)
  58         {
  59                 viewer.replace(activeRow, index);
  60         }
  61 }