UndoableChangeAlternativeRepeat.java

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

import org.herac.tuxguitar.gui.TuxGuitar;
import org.herac.tuxguitar.gui.editors.tab.Caret;
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.TGMeasure;

public class UndoableChangeAlternativeRepeat implements UndoableEdit {
  private static Caret getCaret() {
    return TuxGuitar.instance().getTablatureEditor().getTablature().getCaret();
  }

  public static UndoableChangeAlternativeRepeat startUndo() {
    UndoableChangeAlternativeRepeat undoable = new UndoableChangeAlternativeRepeat();
    Caret caret = getCaret();
    undoable.doAction = UNDO_ACTION;
    undoable.undoCaret = new UndoableCaretHelper();
    undoable.position = caret.getPosition();
    undoable.undoRepeatAlternative = caret.getMeasure().getHeader()
        .getRepeatAlternative();

    return undoable;
  }

  private int doAction;
  private long position;
  private UndoableCaretHelper redoCaret;
  private int redoRepeatAlternative;

  private UndoableCaretHelper undoCaret;

  private int undoRepeatAlternative;

  private UndoableChangeAlternativeRepeat() {
    super();
  }

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

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

  public UndoableChangeAlternativeRepeat endUndo(int redoRepeatAlternative) {
    this.redoCaret = new UndoableCaretHelper();
    this.redoRepeatAlternative = redoRepeatAlternative;
    return this;
  }

  public void redo() throws CannotRedoException {
    if (!canRedo()) {
      throw new CannotRedoException();
    }
    TGSongManager manager = TuxGuitar.instance().getSongManager();
    manager.changeAlternativeRepeat(this.position, this.redoRepeatAlternative);
    TGMeasure measure = manager.getTrackManager().getMeasureAt(
        manager.getFirstTrack(), this.position);
    TuxGuitar.instance().getTablatureEditor().getTablature().getViewLayout()
        .fireUpdate(measure.getNumber());
    this.redoCaret.update();

    this.doAction = UNDO_ACTION;
  }

  public void undo() throws CannotUndoException {
    if (!canUndo()) {
      throw new CannotUndoException();
    }
    TGSongManager manager = TuxGuitar.instance().getSongManager();
    manager.changeAlternativeRepeat(this.position, this.undoRepeatAlternative);
    TGMeasure measure = manager.getTrackManager().getMeasureAt(
        manager.getFirstTrack(), this.position);
    TuxGuitar.instance().getTablatureEditor().getTablature().getViewLayout()
        .fireUpdate(measure.getNumber());
    this.undoCaret.update();

    this.doAction = REDO_ACTION;
  }

}