fmjslider.java

FMJ（freedom media for java)是java视频开发的新选择

package net.sf.fmj.ui.control;

import java.awt.Color;
import java.util.HashSet;

import javax.swing.JSlider;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;

import net.sf.fmj.ui.plaf.FmjSliderUI;

/**
 * A slider with a nice look-and-feel.
 * 
 * @author Warren Bloomer
 *
 */
public class FmjSlider extends JSlider {
	private static final long serialVersionUID = 014L;

	/** whether to track the slider */
//	private boolean trackSlider = false;

	private boolean paintFocus = false;
	
	private int value = -1;
	
	private HashSet linearListeners;
	
	/**
	 * Constructor
	 *
	 */
	public FmjSlider() {
		initialize();
	}
	
	public boolean getPaintFocus() {
		return paintFocus;
	}
	
	public void setPaintFocus(boolean paintFocus) {
		this.paintFocus = paintFocus;
	}
	

	private void initialize() {
		this.setUI(FmjSliderUI.createUI(this));
		this.setName("Slider");
		this.setBackground(Color.WHITE);
		this.setOpaque(false);

		this.setPaintTrack(true);
		this.setPaintTicks(false);
		this.setSnapToTicks(true);

		this.addChangeListener(new SliderListener());
	}
	
	/**
	 * Returns the Linear listeners.
	 * 
	 * @return the Linear listeners
	 */
	private HashSet getLinearListeners() {
		if (linearListeners == null) {
			linearListeners = new HashSet();
		}
		return linearListeners;
	}

	/**
	 * A listener for state change events on the slider
	 */
	private class SliderListener implements ChangeListener {
		public void stateChanged(ChangeEvent event) {
			sendValue();
		}
		
		private void sendValue() {
		    int newValue = getValue();

		    // only send if value has changed
		    if (newValue != value) {
			    value = newValue;
			    // TODO send to listeners
		    }
		}

	}
}