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| Back to [[Into Java - Part XVI]]
| | [[Category:For Removal]] |
| <PRE>
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| import javax.swing.*;
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| import javax.swing.event.*;
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| import java.awt.event.*;
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| import java.awt.*;
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| //import java.util.*;
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| public class SlidePanel extends JPanel {
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| private PaintBox owner; // the main JFrame
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| private JSlider red;
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| private JSlider green;
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| private JSlider blue;
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| public SlidePanel(PaintBox o) {
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| owner = o; // reference to the main frame
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| Box box = Box.createHorizontalBox(); // a holder
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| box.add(red = addSlider(Color.red, true));
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| box.add(green = addSlider(Color.green, true));
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| box.add(blue = addSlider(Color.blue, false));
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| add(box);
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| }
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| /*
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| * A helper medthod to avoid duplicated code
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| */
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| private JSlider addSlider(Color c, boolean bol) {
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| JSlider s = new JSlider(SwingConstants.VERTICAL, // direction
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| 0, // min value
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| 255, // max value
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| 0); // initial value
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| s.setMinorTickSpacing(25);
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| if (bol) {
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| s.setMajorTickSpacing(50);
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| }
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| s.setPaintTicks(true);
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| s.setForeground(c); // foreground color
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| s.addChangeListener(new SliderChangeListener());
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| return s;
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| }
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| public void setColor() {
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| int r = red.getValue();
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| int g = green.getValue();
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| int b = blue.getValue();
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| owner.setColor(r, g, b);
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| }
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| /*
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| * An anonymous listener class that have full access to
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| * the variables and methods of the "surrounding" object
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| */
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| class SliderChangeListener implements ChangeListener {
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| public void stateChanged(ChangeEvent e) {
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| setColor();
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| }
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| }
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| }
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| </PRE>
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| [[Category:Java Articles]] | |