UndoableTrackInstrument.java

package org.herac.tuxguitar.gui.undo.undoables.track;

import org.herac.tuxguitar.gui.TuxGuitar;
import org.herac.tuxguitar.gui.undo.CannotRedoException;
import org.herac.tuxguitar.gui.undo.CannotUndoException;
import org.herac.tuxguitar.gui.undo.UndoableEdit;
import org.herac.tuxguitar.gui.undo.undoables.UndoableCaretHelper;
import org.herac.tuxguitar.song.managers.TGSongManager;
import org.herac.tuxguitar.song.models.TGTrack;

public class UndoableTrackInstrument implements UndoableEdit {
  public static UndoableTrackInstrument startUndo(TGTrack track) {
    UndoableTrackInstrument undoable = new UndoableTrackInstrument();
    undoable.doAction = UNDO_ACTION;
    undoable.undoCaret = new UndoableCaretHelper();
    undoable.trackNumber = track.getNumber();
    undoable.undoInstrument = track.getChannel().getInstrument();
    undoable.undoPercussion = track.isPercussionTrack();

    return undoable;
  }

  private int doAction;
  private UndoableCaretHelper redoCaret;
  private short redoInstrument;
  private boolean redoPercussion;
  private int trackNumber;
  private UndoableCaretHelper undoCaret;
  private short undoInstrument;

  private boolean undoPercussion;

  private UndoableTrackInstrument() {
    super();
  }

  public boolean canRedo() {
    return (this.doAction == REDO_ACTION);
  }

  public boolean canUndo() {
    return (this.doAction == UNDO_ACTION);
  }

  public UndoableTrackInstrument endUndo(TGTrack track) {
    this.redoCaret = new UndoableCaretHelper();
    this.redoInstrument = track.getChannel().getInstrument();
    this.redoPercussion = track.isPercussionTrack();

    return this;
  }

  public void redo() throws CannotRedoException {
    if (!canRedo()) {
      throw new CannotRedoException();
    }
    TGSongManager manager = TuxGuitar.instance().getSongManager();
    manager.getTrackManager().changeInstrument(
        manager.getTrack(this.trackNumber), this.redoInstrument,
        this.redoPercussion);
    TuxGuitar.instance().fireUpdate();
    TuxGuitar.instance().getMixer().updateValues();
    if (TuxGuitar.instance().getPlayer().isRunning()) {
      TuxGuitar.instance().getPlayer().updatePrograms();
    }
    this.redoCaret.update();
    this.doAction = UNDO_ACTION;
  }

  public void undo() throws CannotUndoException {
    if (!canUndo()) {
      throw new CannotUndoException();
    }
    TGSongManager manager = TuxGuitar.instance().getSongManager();
    manager.getTrackManager().changeInstrument(
        manager.getTrack(this.trackNumber), this.undoInstrument,
        this.undoPercussion);
    TuxGuitar.instance().fireUpdate();
    TuxGuitar.instance().getMixer().updateValues();
    if (TuxGuitar.instance().getPlayer().isRunning()) {
      TuxGuitar.instance().getPlayer().updatePrograms();
    }
    this.undoCaret.update();

    this.doAction = REDO_ACTION;
  }

}