1 /* 2 * File: ScrollbarTest.java 3 * 4 * Create a scrollbar (i.e., a slide control), with scrollbox, unit 5 * and block increment, and direction. Shows Adjustment event and 6 * getting the new value to display in a label. 7 * 8 * Copyright: Northeast Parallel Architectures Center 9 * 10 */ 11 12 import java.awt.Label; 13 import java.awt.Scrollbar; 14 import java.awt.Color; 15 import java.awt.BorderLayout; 16 import java.awt.Font; 17 import java.awt.event.AdjustmentListener; 18 import java.awt.event.AdjustmentEvent; 19 20 public class ScrollbarTest extends java.applet.Applet 21 implements AdjustmentListener { 22 23 private Label labelLeft, labelCenter, labelRight; 24 private Scrollbar scrollbar; 25 26 public void init() { 27 setBackground( Color.white ); 28 Color lightBlue = new Color( 0xB0, 0xE0, 0xE6 ); 29 30 int min = 0; // minimum value of scrollbar 31 labelLeft = new Label( String.valueOf( min ) ); 32 labelLeft.setAlignment( Label.LEFT ); 33 labelLeft.setFont( new Font( "Serif", Font.PLAIN, 18 ) ); 34 labelLeft.setForeground (Color.green); 35 36 int max = 100; // maximum value of scrollbar 37 labelRight = new Label( String.valueOf( max ) ); 38 labelRight.setAlignment( Label.RIGHT ); 39 labelRight.setFont( new Font( "Serif", Font.PLAIN, 18 ) ); 40 labelRight.setForeground (Color.green); 41 42 int pos = 50; // initial position of scrollbox 43 labelCenter = new Label( String.valueOf( pos ) ); 44 labelCenter.setAlignment( Label.CENTER ); 45 labelCenter.setFont( new Font( "Serif", Font.BOLD, 30 ) ); 46 47 int orientation = Scrollbar.HORIZONTAL; 48 int size = 5; // relative size of the scrollbox 49 scrollbar = new Scrollbar( orientation, pos, size, min, max ); 50 scrollbar.setBlockIncrement(10); 51 scrollbar.setBackground( lightBlue ); 52 53 // Add components to the applet: 54 setLayout( new BorderLayout() ); 55 add( labelLeft, BorderLayout.WEST ); 56 add( labelRight, BorderLayout.EAST ); 57 add( labelCenter, BorderLayout.CENTER ); 58 add( scrollbar, BorderLayout.SOUTH ); 59 60 // Listen for AdjustmentEvents: 61 scrollbar.addAdjustmentListener( this ); 62 } 63 64 public void adjustmentValueChanged( AdjustmentEvent event ) { 65 int v = event.getValue(); 66 labelCenter.setText( String.valueOf(v) ); 67 } 68 69 }