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/* Glazed Lists (c) 2003-2006 */
/* http://publicobject.com/glazedlists/ publicobject.com,*/
/* O'Dell Engineering Ltd.*/
package ca.odell.glazedlists.impl.swing;
// the core Glazed Lists packages
import ca.odell.glazedlists.ThresholdList;
import javax.swing.*;
/**
* A LowerThresholdRangeModel provides an implementation of a bounded-range
* model for a slider widget that binds a JSlider to a ThresholdList. This
* implementation maps the slider value to the lower threshold of the
* ThresholdList.
*
* @author <a href="mailto:kevin@swank.ca">Kevin Maltby</a>
*/
public class LowerThresholdRangeModel extends DefaultBoundedRangeModel implements BoundedRangeModel {
/** the list to connect a slider widget to */
private ThresholdList target = null;
/**
* Creates a new range that controls specified ThresholdList.
*/
public LowerThresholdRangeModel(ThresholdList target) {
this.target = target;
}
/**
* Returns the model's maximum.
*/
@Override
public int getMaximum() {
target.getReadWriteLock().readLock().lock();
try {
return target.getUpperThreshold();
} finally {
target.getReadWriteLock().readLock().unlock();
}
}
/**
* Returns the model's current value.
*/
@Override
public int getValue() {
target.getReadWriteLock().readLock().lock();
try {
return target.getLowerThreshold();
} finally {
target.getReadWriteLock().readLock().unlock();
}
}
/**
* Sets all of the properties for this bounded-range.
*
* <p>This is a tweaked version of the setRangeProperties method to be found
* in the JDK source for DefaultBoundedRangeModel. Just giving credit where
* credit is due.
*/
@Override
public void setRangeProperties(int newValue, int newExtent, int newMin, int newMax, boolean adjusting) {
target.getReadWriteLock().writeLock().lock();
try {
// Correct invalid values
if(newMin > newMax) newMin = newMax;
if(newValue > newMax) newMax = newValue;
if(newValue < newMin) newMin = newValue;
// See if non-threshold model changes are necessary
boolean changed =
(newExtent != getExtent()) ||
(newMin != getMinimum()) ||
(adjusting != getValueIsAdjusting());
// Set the lower threshold if applicable
if(newValue != getValue()) {
target.setLowerThreshold(newValue);
changed = true;
}
// Set the upper threshold if applicable
if(newMax != getMaximum()) {
target.setUpperThreshold(newMax);
changed = true;
}
// Update all of the range properties if there was a change
if(changed) super.setRangeProperties(newValue, newExtent, newMin, newMax, adjusting);
} finally {
target.getReadWriteLock().writeLock().unlock();
}
}
}
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