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Viewing changes to TuxGuitar/src/org/herac/tuxguitar/gui/undo/undoables/custom/UndoableChangeTempo.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/UndoableChangeTempo.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.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.models.TGMeasureHeader;
 
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import org.herac.tuxguitar.song.models.TGTempo;
 
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public class UndoableChangeTempo 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 List undoableTempos;
 
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        private List redoableTempos;
 
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        private UndoableChangeTempo(){
 
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                super();
 
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                this.undoableTempos = new ArrayList();
 
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                this.redoableTempos = new ArrayList();
 
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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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                this.setTempos(this.redoableTempos);
 
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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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                this.setTempos(this.undoableTempos);
 
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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 UndoableChangeTempo startUndo(){
 
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                UndoableChangeTempo undoable = new UndoableChangeTempo();
 
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                undoable.doAction = UNDO_ACTION;
 
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                undoable.undoCaret = new UndoableCaretHelper();
 
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                undoable.getTempos(undoable.undoableTempos);
 
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                return undoable;
 
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        }
 
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        public UndoableChangeTempo endUndo(){
 
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                this.redoCaret = new UndoableCaretHelper();
 
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                this.getTempos(this.redoableTempos);
 
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                return this;
 
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        }
 
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        private void getTempos(List list){
 
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                Iterator it = TuxGuitar.instance().getSongManager().getSong().getMeasureHeaders();
 
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                while(it.hasNext()){
 
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                        TGMeasureHeader header = (TGMeasureHeader)it.next();
 
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                        list.add(header.getTempo().clone(TuxGuitar.instance().getSongManager().getFactory()));
 
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                }
 
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        }
 
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        private void setTempos(List tempos){
 
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                int length = tempos.size();
 
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                if(length != TuxGuitar.instance().getSongManager().getSong().countMeasureHeaders()){
 
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                        return;
 
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                }
 
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                for(int i =0; i < length; i ++){
 
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                        TGTempo tempo = ((TGTempo)tempos.get(i)).clone(TuxGuitar.instance().getSongManager().getFactory());
 
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                        TuxGuitar.instance().getSongManager().changeTempo(TuxGuitar.instance().getSongManager().getMeasureHeader(i + 1),tempo);
 
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                }
 
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                TuxGuitar.instance().fireUpdate();
 
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        }
 
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}