demo5() {
f = new Frame();
f.setSize(300, 300);
// f.setBackground(Color.red);
f.setLayout(null);
s1 = new Scrollbar(Scrollbar.VERTICAL, 0, 5, 0, 260);
s1.setBackground(Color.red);
s1.setBounds(30, 35, 20, 255);
s2 = new Scrollbar(Scrollbar.VERTICAL, 0, 5, 0, 260);
s2.setBackground(Color.green);
s2.setBounds(60, 35, 20, 255);
s3 = new Scrollbar(Scrollbar.VERTICAL, 0, 5, 0, 260);
s3.setBackground(Color.blue);
s3.setBounds(90, 35, 20, 255);
f.add(s1);
f.add(s2);
f.add(s3);
s1.addAdjustmentListener(this);
s2.addAdjustmentListener(this);
s3.addAdjustmentListener(this);
p1 = new Panel();
p1.setBounds(120, 35, 170, 255);
f.add(p1);
f.setVisible(true);
}
public void init() {
/*
* O construtor usado cria "uma barra" com valor inicial 0,
* de largura 10 pixels, valor m�ni,o poss�vel 0 e m�ximo 265
* como a barra de rolagem tem 10 pixels, seu canto inferior
* esquerdo d� pode chegar ate 255 (valor m�ximo em RGB)
*/
redScroll = new Scrollbar(Scrollbar.HORIZONTAL, 0, 10, 0, 265);
greenScroll = new Scrollbar(Scrollbar.HORIZONTAL, 0, 10, 0, 265);
blueScroll = new Scrollbar(Scrollbar.HORIZONTAL, 0, 10, 0, 265);
/* Create Labels showing current RGB and HSB values. */
redLabel = new Label(" R = 0");
greenLabel = new Label(" G = 0");
blueLabel = new Label(" B = 0");
/* Set background colors for Scrollbars and Labels, so they don't
inherit the gray background of the applet.
*/
redScroll.setBackground(Color.lightGray);
greenScroll.setBackground(Color.lightGray);
blueScroll.setBackground(Color.lightGray);
redLabel.setBackground(Color.white);
greenLabel.setBackground(Color.white);
blueLabel.setBackground(Color.white);
/* Set the applet to listen for changes to the Scrollbars' values */ redScroll
.addAdjustmentListener(this);
greenScroll.addAdjustmentListener(this);
blueScroll.addAdjustmentListener(this);
/* Create a canvas whose background color will always be set to the currently selected color. */ colorCanvas =
new Canvas();
colorCanvas.setBackground(Color.black);
/* Create the applet layout, which consists of a row of three equal-sized regions holding the Scrollbars, the Labels, and the color patch. The background color of the applet is gray, which will show around the edges and between components. */
setLayout(new GridLayout(1, 3, 3, 3));
setBackground(Color.gray);
Panel scrolls = new Panel();
Panel labels = new Panel();
add(scrolls);
add(labels);
add(colorCanvas);
/* Add the Scrollbars and the Labels to their respective panels. */
scrolls.setLayout(new GridLayout(3, 1, 2, 2));
scrolls.add(redScroll);
scrolls.add(greenScroll);
scrolls.add(blueScroll);
labels.setLayout(new GridLayout(3, 1, 2, 2));
labels.add(redLabel);
labels.add(greenLabel);
labels.add(blueLabel);
setSize(new Dimension(500, 100));
// curiosamente, aqui n�o funcionou setPreferredSize() !!!
} // end init();