slider.java

本程序提供了各种排序算法及演示,由java实现,可以清楚看到各算法的流程演示.

// Slider.java
import java.awt.*;
import java.awt.event.*;

public class Slider extends Panel implements Adjustable
{
   Scrollbar scrollbar;
   Label valueLabel, titleLabel;

   public Slider(String title, int initialValue, int visible, int min, int max)
   {
      String initialValueStr = Integer.toString(initialValue);

      valueLabel = new Label(initialValueStr, Label.CENTER);
      titleLabel = new Label(title, Label.CENTER);

      scrollbar  = new Scrollbar(Scrollbar.HORIZONTAL, initialValue, visible, min, max);

      setLayout(new BorderLayout());
      add(valueLabel, "North");
      add(scrollbar, "Center");
      add(titleLabel, "South");

      scrollbar.addAdjustmentListener(new AdjustmentListener()
      {
         public void adjustmentValueChanged(AdjustmentEvent e)
         {
	    valueLabel.setText(Integer.toString(scrollbar.getValue()));
         }
      });
   }

   public void addAdjustmentListener(AdjustmentListener l)
   {
      scrollbar.addAdjustmentListener(l);
   }

   public void removeAdjustmentListener(AdjustmentListener l)
   {
      scrollbar.removeAdjustmentListener(l);
   }

   public int getOrientation()
   {
      return scrollbar.getOrientation();	
   }

   public void setOrientation(int orient)
   {
      scrollbar.setOrientation(orient);	
   }

   public int getValue()
   {
      return scrollbar.getValue();
   }

   public int getVisibleAmount()
   {
      return scrollbar.getVisibleAmount();
   }

   public int getMinimum()
   {
      return scrollbar.getMinimum();
   }

   public int getMaximum()
   {
      return scrollbar.getMaximum();
   }

   public int getUnitIncrement()
   {
      return scrollbar.getUnitIncrement();
   }

   public int getBlockIncrement()
   {
      return scrollbar.getBlockIncrement();
   }

   public void setValue(int value)
   {
      scrollbar.setValue(value);
      valueLabel.setText(Integer.toString(value));
   }

   public void setVisibleAmount(int value)
   {
      scrollbar.setVisibleAmount(value);
   }

   public void setMinimum(int min)
   {
      scrollbar.setMinimum(min);
   }

   public void setMaximum(int max)
   {
      scrollbar.setMaximum(max);
   }

   public void setUnitIncrement(int inc)
   {
      scrollbar.setUnitIncrement(inc);
   }

   public void setBlockIncrement(int inc)
   {
      scrollbar.setBlockIncrement(inc);
   }
}