/* * Works in 1.1+Swing, 1.4, and all releases in between. * Used by the Converter example. */import javax.swing.*;import javax.swing.event.*;/** * Implements a model whose data is actually in another model (the * "source model").  The follower model adjusts the values obtained * from the source model (or set in the follower model) to be in * a different unit of measure. * */public class FollowerRangeModel extends ConverterRangeModel                                implements ChangeListener {    ConverterRangeModel sourceModel; //the real model    /** Creates a FollowerRangeModel that gets its state from sourceModel. */    public FollowerRangeModel(ConverterRangeModel sourceModel) {        this.sourceModel = sourceModel;        sourceModel.addChangeListener(this);    }    //The only method in the ChangeListener interface.    public void stateChanged(ChangeEvent e) {        fireStateChanged();    }    public int getMaximum() {        int modelMax = sourceModel.getMaximum();        double multiplyBy = sourceModel.getMultiplier()/this.getMultiplier();        return (int)(modelMax * multiplyBy);    }    public void setMaximum(int newMaximum) {        sourceModel.setMaximum((int)(newMaximum *                     (this.getMultiplier()/sourceModel.getMultiplier())));    }    public int getValue() {        return (int)getDoubleValue();    }    public void setValue(int newValue) {        setDoubleValue((double)newValue);    }    public double getDoubleValue() {        return sourceModel.getDoubleValue()               * sourceModel.getMultiplier()               / this.getMultiplier();    }    public void setDoubleValue(double newValue) {        sourceModel.setDoubleValue(                     newValue * this.getMultiplier()                     / sourceModel.getMultiplier());    }    public int getExtent() {        return super.getExtent();    }    public void setExtent(int newExtent) {        super.setExtent(newExtent);    }    public void setRangeProperties(int value,                                   int extent,                                   int min,                                   int max,                                   boolean adjusting) {        double multiplyBy = this.getMultiplier()/sourceModel.getMultiplier();        sourceModel.setRangeProperties(value*multiplyBy,                                     extent, min,                                     (int)(max*multiplyBy),                                     adjusting);    }}