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src/org/herac/tuxguitar/gui/undo/undoables/measure/UndoableAddMeasure.java

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

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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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public class UndoableAddMeasure implements UndoableEdit{

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        private int doAction;

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        private UndoableCaretHelper undoCaret;

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        private UndoableCaretHelper redoCaret;

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        private int number;

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        private UndoableAddMeasure(){

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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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                TuxGuitar.instance().getSongManager().addNewMeasure(this.number);

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                TuxGuitar.instance().fireUpdate();

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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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                TuxGuitar.instance().getSongManager().removeMeasure(this.number);

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                TuxGuitar.instance().fireUpdate();

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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 UndoableAddMeasure startUndo(int number){

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        UndoableAddMeasure undoable = new UndoableAddMeasure();

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        Caret caret = getCaret();               

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        undoable.undoCaret = new UndoableCaretHelper();

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        undoable.doAction = UNDO_ACTION;        

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        undoable.number = number;

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        return undoable;

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    }

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    public UndoableAddMeasure endUndo(){

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        this.redoCaret = new UndoableCaretHelper();

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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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