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src/org/herac/tuxguitar/gui/undo/undoables/track/UndoableMoveTrackDown.java

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

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import org.herac.tuxguitar.gui.TuxGuitar;

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

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import org.herac.tuxguitar.gui.undo.CannotRedoException;

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import org.herac.tuxguitar.gui.undo.CannotUndoException;

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import org.herac.tuxguitar.gui.undo.UndoableEdit;

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import org.herac.tuxguitar.gui.undo.undoables.UndoableCaretHelper;

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import org.herac.tuxguitar.song.managers.SongManager;

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import org.herac.tuxguitar.song.models.SongTrack;

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public class UndoableMoveTrackDown implements UndoableEdit{

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        private int doAction;

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        private int trackNumber;

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        private UndoableCaretHelper undoCaret;

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        private UndoableCaretHelper redoCaret;          

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        private UndoableMoveTrackDown(){

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        }

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        public void redo() throws CannotRedoException { 

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                if(!canRedo()){

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                        throw new CannotRedoException();

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                }        

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                SongManager manager = TuxGuitar.instance().getSongManager();

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                manager.moveTrackDown(manager.getTrack(trackNumber - 1));

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                TuxGuitar.instance().fireUpdate();

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                TuxGuitar.instance().getMixer().update();               

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                this.redoCaret.update();

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                this.doAction = UNDO_ACTION;

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        }

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        public void undo() throws CannotUndoException {

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                if(!canUndo()){

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                        throw new CannotUndoException();

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                }

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                SongManager manager = TuxGuitar.instance().getSongManager();

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                manager.moveTrackUp(manager.getTrack(trackNumber));

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                TuxGuitar.instance().fireUpdate();

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                TuxGuitar.instance().getMixer().update();                               

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                this.undoCaret.update();

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                this.doAction = REDO_ACTION;

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        }

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    public boolean canRedo() {

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        return (doAction == REDO_ACTION);

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    }

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    public boolean canUndo() {

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        return (doAction == UNDO_ACTION);

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    }

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    public static UndoableMoveTrackDown startUndo(){

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        UndoableMoveTrackDown undoable = new UndoableMoveTrackDown();           

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        undoable.doAction = UNDO_ACTION;

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        undoable.undoCaret = new UndoableCaretHelper(); 

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        return undoable;

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    }

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    public UndoableMoveTrackDown endUndo(SongTrack track){    

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        this.redoCaret = new UndoableCaretHelper();

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        this.trackNumber = track.getNumber();

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                return this;

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    }

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    private static Caret getCaret(){

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        return TuxGuitar.instance().getTablatureEditor().getTablature().getCaret();

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    }

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}

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