vs6262
Silver Member | Редактировать | Профиль | Сообщение | Цитировать | Сообщить модератору
import java.awt.Color;
import java.awt.Container;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Insets;
import java.awt.Rectangle;
import java.awt.RenderingHints;
//from w w w. j a va 2 s .c o m
import javax.swing.JButton;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JScrollBar;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.ScrollPaneLayout;
import javax.swing.WindowConstants;
import javax.swing.plaf.basic.BasicScrollBarUI;
public class Main {
public static void main(String[] args) {
JTextArea cmp = new JTextArea();
String str = "a";
for (int i = 0; i < 20; i++) {
cmp.append(str + str + "\n");
}
JScrollPane scrollPane = new JScrollPane(cmp);
scrollPane.setComponentZOrder(scrollPane.getVerticalScrollBar(), 0);
scrollPane.setComponentZOrder(scrollPane.getViewport(), 1);
scrollPane.getVerticalScrollBar().setOpaque(false);
scrollPane.setLayout(new ScrollPaneLayout() {
@Override
public void layoutContainer(Container parent) {
JScrollPane scrollPane = (JScrollPane) parent;
Rectangle availR = scrollPane.getBounds();
availR.x = availR.y = 0;
Insets parentInsets = parent.getInsets();
availR.x = parentInsets.left;
availR.y = parentInsets.top;
availR.width -= parentInsets.left + parentInsets.right;
availR.height -= parentInsets.top + parentInsets.bottom;
Rectangle vsbR = new Rectangle();
vsbR.width = 12;
vsbR.height = availR.height;
vsbR.x = availR.x + availR.width - vsbR.width;
vsbR.y = availR.y;
if (viewport != null) {
viewport.setBounds(availR);
}
if (vsb != null) {
vsb.setVisible(true);
vsb.setBounds(vsbR);
}
}
});
scrollPane.getVerticalScrollBar().setUI(new MyScrollBarUI());
scrollPane.getHorizontalScrollBar().setUI(new MyScrollBarUI());
JFrame f = new JFrame();
f.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
f.getContentPane().add(scrollPane);
f.setSize(320, 240);
f.setVisible(true);
}
}
class MyScrollBarUI extends BasicScrollBarUI {
private final Dimension d = new Dimension();
@Override
protected JButton createDecreaseButton(int orientation) {
return new JButton() {
@Override
public Dimension getPreferredSize() {
return d;
}
};
}
@Override
protected JButton createIncreaseButton(int orientation) {
return new JButton() {
@Override
public Dimension getPreferredSize() {
return d;
}
};
}
@Override
protected void paintTrack(Graphics g, JComponent c, Rectangle r) {
}
@Override
protected void paintThumb(Graphics g, JComponent c, Rectangle r) {
Graphics2D g2 = (Graphics2D) g.create();
g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
RenderingHints.VALUE_ANTIALIAS_ON);
Color color = null;
JScrollBar sb = (JScrollBar) c;
if (!sb.isEnabled() || r.width > r.height) {
return;
} else if (isDragging) {
color = Color.DARK_GRAY;
} else if (isThumbRollover()) {
color = Color.LIGHT_GRAY;
} else {
color = Color.GRAY;
}
g2.setPaint(color);
g2.fillRoundRect(r.x, r.y, r.width, r.height, 10, 10);
g2.setPaint(Color.WHITE);
g2.drawRoundRect(r.x, r.y, r.width, r.height, 10, 10);
g2.dispose();
}
@Override
protected void setThumbBounds(int x, int y, int width, int height) {
super.setThumbBounds(x, y, width, height);
scrollbar.repaint();
}
} |
