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Viewing changes to TuxGuitar/src/org/herac/tuxguitar/gui/undo/undoables/custom/UndoableChangeTimeSignature.java

  • Committer: Bazaar Package Importer
  • Author(s): Philippe Coval
  • Date: 2008-06-19 00:30:30 UTC
  • mto: (5.1.2 sid)
  • mto: This revision was merged to the branch mainline in revision 3.
  • Revision ID: james.westby@ubuntu.com-20080619003030-h719szrhsngou7c6
Tags: upstream-1.0
Import upstream version 1.0

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TuxGuitar/src/org/herac/tuxguitar/gui/undo/undoables/custom/UndoableChangeTimeSignature.java
 
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package org.herac.tuxguitar.gui.undo.undoables.custom;
 
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import java.util.ArrayList;
 
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import java.util.Iterator;
 
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import java.util.List;
 
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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.editors.tab.TGMeasureImpl;
 
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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.TGSongManager;
 
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import org.herac.tuxguitar.song.models.TGMeasure;
 
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import org.herac.tuxguitar.song.models.TGTimeSignature;
 
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import org.herac.tuxguitar.song.models.TGTrack;
 
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public class UndoableChangeTimeSignature 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 long position;
 
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        private TGTimeSignature redoableTimeSignature;
 
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        private TGTimeSignature undoableTimeSignature;
 
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        private List nextTimeSignaturePositions;
 
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        private boolean toEnd;
 
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        private UndoableChangeTimeSignature(){
 
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                super();
 
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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().changeTimeSignature(this.position,this.redoableTimeSignature.clone(TuxGuitar.instance().getSongManager().getFactory()),this.toEnd);
 
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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().changeTimeSignature(this.position,this.undoableTimeSignature.clone(TuxGuitar.instance().getSongManager().getFactory()),this.toEnd);
 
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                if(this.toEnd){
 
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                        Iterator it = this.nextTimeSignaturePositions.iterator();
 
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                        while(it.hasNext()){
 
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                                TimeSignaturePosition tsp = (TimeSignaturePosition)it.next();
 
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                                TuxGuitar.instance().getSongManager().changeTimeSignature(tsp.getPosition(),tsp.getTimeSignature().clone(TuxGuitar.instance().getSongManager().getFactory()),true);
 
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                        }
 
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                }
 
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                if( shouldRemoveRightBeats() ){
 
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                        removeRightBeats( this.position, this.toEnd );
 
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                }
 
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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 (this.doAction == REDO_ACTION);
 
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        }
 
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        public boolean canUndo() {
 
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                return (this.doAction == UNDO_ACTION);
 
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        }
 
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        public static UndoableChangeTimeSignature startUndo(){
 
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                UndoableChangeTimeSignature undoable = new UndoableChangeTimeSignature();
 
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                Caret caret = getCaret();
 
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                undoable.doAction = UNDO_ACTION;
 
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                undoable.undoCaret = new UndoableCaretHelper();
 
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                undoable.position = caret.getPosition();
 
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                undoable.undoableTimeSignature = caret.getMeasure().getTimeSignature().clone(TuxGuitar.instance().getSongManager().getFactory());
 
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                undoable.nextTimeSignaturePositions = new ArrayList();
 
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                TGTimeSignature prevTimeSignature = undoable.undoableTimeSignature;
 
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                Iterator it = TuxGuitar.instance().getSongManager().getFirstTrack().getMeasures();
 
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                while(it.hasNext()){
 
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                        TGMeasureImpl measure = (TGMeasureImpl)it.next();
 
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                        if(measure.getStart() > undoable.position){
 
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                                TGTimeSignature currTimeSignature = measure.getTimeSignature();
 
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                                int numerator = prevTimeSignature.getNumerator();
 
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                                int value = prevTimeSignature.getDenominator().getValue();
 
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                                int currNumerator = currTimeSignature.getNumerator();
 
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                                int currValue = currTimeSignature.getDenominator().getValue();
 
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                                if(numerator != currNumerator || value != currValue){
 
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                                        TimeSignaturePosition tsp = undoable.new TimeSignaturePosition(measure.getStart(),currTimeSignature.clone(TuxGuitar.instance().getSongManager().getFactory()));
 
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                                        undoable.nextTimeSignaturePositions.add(tsp);
 
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                                }
 
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                                prevTimeSignature = currTimeSignature;
 
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                        }
 
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                }
 
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                return undoable;
 
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        }
 
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        public UndoableChangeTimeSignature endUndo(TGTimeSignature timeSignature,boolean toEnd){
 
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                this.redoCaret = new UndoableCaretHelper();
 
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                this.redoableTimeSignature = timeSignature.clone(TuxGuitar.instance().getSongManager().getFactory());
 
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                this.toEnd = toEnd;
 
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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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        private boolean shouldRemoveRightBeats(){
 
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                long redoableTime = (this.redoableTimeSignature.getNumerator() * this.redoableTimeSignature.getDenominator().getTime());
 
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                long undoableTime = (this.undoableTimeSignature.getNumerator() * this.undoableTimeSignature.getDenominator().getTime());
 
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                return (redoableTime > undoableTime);
 
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        }
 
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        private void removeRightBeats(long position, boolean toEnd){
 
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                TGSongManager manager = TuxGuitar.instance().getSongManager();
 
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                int tracks = manager.getSong().countTracks();
 
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                for( int i = 1 ; i <= tracks ; i ++ ){
 
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                        TGTrack track = manager.getTrack( i );
 
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                        TGMeasure measure = manager.getTrackManager().getMeasureAt(track, position );
 
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                        manager.getMeasureManager().removeBeatsBeforeEnd(measure, ( measure.getStart() + measure.getLength() ) );
 
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                        if( toEnd ){
 
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                                while( (measure = manager.getTrackManager().getNextMeasure(measure)) != null ){
 
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                                        manager.getMeasureManager().removeBeatsBeforeEnd(measure, ( measure.getStart() + measure.getLength() ) );
 
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                                }
 
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                        }
 
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                }
 
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        }
 
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        private class TimeSignaturePosition{
 
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                private long position;
 
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                private TGTimeSignature timeSignature;
 
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                public TimeSignaturePosition(long position, TGTimeSignature timeSignature) {
 
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                        this.position = position;
 
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                        this.timeSignature = timeSignature;
 
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                }
 
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                public long getPosition() {
 
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                        return this.position;
 
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                }
 
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                public TGTimeSignature getTimeSignature() {
 
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                        return this.timeSignature;
 
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                }
 
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        }
 
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}