I am using per-pixel transparency using AWTUtilities.setWindowOpaque() on JFrame, that contains JScrollPane. When transparency is on, the scrolling in that pane is very slow and laggy, without it is not. Trying this on Windows 7 and JDK 6.
public class MainFrame extends JFrame {
super();
setUndecorated(true);
AWTUtilities.setWindowOpaque(this, false); //this turns JScrollPane inside of this JFrame slow and laggy
}
Have anyone issued this? Thanks!
I can't see any scrolling issue, nor to create testing scenario for code that is based on good Swing rules, this code is quite too hard for processor(s) and GPU, Java6, Win7 64b
from code
import com.sun.awt.AWTUtilities;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.image.BufferedImage;
import javax.swing.*;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;
import javax.swing.table.TableModel;
public class ViewPortFlickeringOriginal {
private JFrame frame = new JFrame("Table");
private JViewport viewport = new JViewport();
private Rectangle RECT = new Rectangle();
private Rectangle RECT1 = new Rectangle();
private JTable table = new JTable(50, 3);
private javax.swing.Timer timer;
private int count = 0;
private GradientViewPortOriginal tableViewPort;
private static boolean loggerOpacity;
private JPanel panel = new JPanel();
private static JButton button;
public ViewPortFlickeringOriginal() {
tableViewPort = new GradientViewPortOriginal(table);
viewport = tableViewPort.getViewport();
viewport.addChangeListener(new ChangeListener() {
@Override
public void stateChanged(ChangeEvent e) {
if (tableViewPort.bolStart) {
RECT = table.getCellRect(0, 0, true);
RECT1 = table.getCellRect(table.getRowCount() - 1, 0, true);
Rectangle viewRect = viewport.getViewRect();
if (viewRect.intersects(RECT)) {
System.out.println("Visible RECT -> " + RECT);
tableViewPort.paintBackGround(new Color(250, 150, 150));
} else if (viewRect.intersects(RECT1)) {
System.out.println("Visible RECT1 -> " + RECT1);
tableViewPort.paintBackGround(new Color(150, 250, 150));
} else {
System.out.println("Visible RECT1 -> ???? ");
tableViewPort.paintBackGround(new Color(150, 150, 250));
}
}
}
});
frame.add(tableViewPort);
button = new JButton("Change Opacity for Java6 / Win7");
button.setBounds(100, 100, 50, 50);
button.setVisible(true);
panel.add(button);
loggerOpacity = true;
button.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent evt) {
Object src = evt.getSource();
if (src == button && loggerOpacity) {
AWTUtilities.setWindowOpacity(frame, 0.80f);
}
}
});
frame.add(panel, BorderLayout.SOUTH);
frame.setPreferredSize(new Dimension(600, 300));
frame.pack();
frame.setLocation(50, 100);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
RepaintManager.setCurrentManager(new RepaintManager() {
@Override
public void addDirtyRegion(JComponent c, int x, int y, int w, int h) {
Container con = c.getParent();
while (con instanceof JComponent) {
if (!con.isVisible()) {
return;
}
if (con instanceof GradientViewPortOriginal) {
c = (JComponent) con;
x = 0;
y = 0;
w = con.getWidth();
h = con.getHeight();
}
con = con.getParent();
}
super.addDirtyRegion(c, x, y, w, h);
}
});
frame.setVisible(true);
start();
}
private void start() {
timer = new javax.swing.Timer(100, updateCol());
timer.start();
}
public Action updateCol() {
return new AbstractAction("text load action") {
private static final long serialVersionUID = 1L;
@Override
public void actionPerformed(ActionEvent e) {
System.out.println("updating row " + (count + 1));
TableModel model = table.getModel();
int cols = model.getColumnCount();
int row = 0;
for (int j = 0; j < cols; j++) {
row = count;
table.changeSelection(row, 0, false, false);
timer.setDelay(100);
Object value = "row " + (count + 1) + " item " + (j + 1);
model.setValueAt(value, count, j);
}
count++;
if (count >= table.getRowCount()) {
timer.stop();
table.changeSelection(0, 0, false, false);
java.awt.EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
table.clearSelection();
tableViewPort.bolStart = true;
}
});
}
}
};
}
public static void main(String[] args) {
java.awt.EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
ViewPortFlickeringOriginal viewPortFlickering = new ViewPortFlickeringOriginal();
}
});
}
}
class GradientViewPortOriginal extends JScrollPane {
private static final long serialVersionUID = 1L;
private final int h = 50;
private BufferedImage img = null;
private BufferedImage shadow = new BufferedImage(1, h, BufferedImage.TYPE_INT_ARGB);
private JViewport viewPort;
public boolean bolStart = false;
public GradientViewPortOriginal(JComponent com) {
super(com);
viewPort = this.getViewport();
viewPort.setScrollMode(JViewport.BLIT_SCROLL_MODE);
viewPort.setScrollMode(JViewport.BACKINGSTORE_SCROLL_MODE);
viewPort.setScrollMode(JViewport.SIMPLE_SCROLL_MODE);
paintBackGround(new Color(250, 150, 150));
}
public void paintBackGround(Color g) {
Graphics2D g2 = shadow.createGraphics();
g2.setPaint(g);
g2.fillRect(0, 0, 1, h);
g2.setComposite(AlphaComposite.DstIn);
g2.setPaint(new GradientPaint(0, 0, new Color(0, 0, 0, 0f), 0, h,
new Color(0.1f, 0.8f, 0.8f, 0.5f)));
g2.fillRect(0, 0, 1, h);
g2.dispose();
}
@Override
public void paint(Graphics g) {
if (img == null || img.getWidth() != getWidth() || img.getHeight() != getHeight()) {
img = new BufferedImage(getWidth(), getHeight(), BufferedImage.TYPE_INT_ARGB);
}
Graphics2D g2 = img.createGraphics();
super.paint(g2);
Rectangle bounds = getViewport().getVisibleRect();
g2.scale(bounds.getWidth(), -1);
int y = (getColumnHeader() == null) ? 0 : getColumnHeader().getHeight();
g2.drawImage(shadow, bounds.x, -bounds.y - y - h, null);
g2.scale(1, -1);
g2.drawImage(shadow, bounds.x, bounds.y + bounds.height - h + y, null);
g2.dispose();
g.drawImage(img, 0, 0, null);
}
}
but I'm able to demonstrating lazy scrolling for JScrollPane contains others JComponents as is JTable or JList or JTextArea or JTextPane
import java.awt.Color;
import java.awt.Component;
import java.awt.GridLayout;
import java.awt.event.AdjustmentEvent;
import java.awt.event.AdjustmentListener;
import javax.swing.*;
public class ListPanel extends JFrame {
private static final long serialVersionUID = 1L;
public ListPanel() {
setLayout(new GridLayout(0, 2, 10, 10));
DefaultListModel model = new DefaultListModel();
model.addElement(createButtons("one"));
model.addElement(createButtons("two"));
model.addElement(createButtons("three"));
model.addElement(createButtons("four"));
model.addElement(createButtons("five"));
model.addElement(createButtons("six"));
model.addElement(createButtons("seven"));
model.addElement(createButtons("eight"));
model.addElement(createButtons("nine"));
model.addElement(createButtons("ten"));
model.addElement(createButtons("eleven"));
model.addElement(createButtons("twelwe"));
JList list = new JList(model);
list.setCellRenderer(new PanelRenderer());
JScrollPane scroll1 = new JScrollPane(list);
final JScrollBar scrollBar = scroll1.getVerticalScrollBar();
scrollBar.addAdjustmentListener(new AdjustmentListener() {
@Override
public void adjustmentValueChanged(AdjustmentEvent e) {
System.out.println("JScrollBar's current value = " + scrollBar.getValue());
}
});
add(scroll1);
JScrollPane scroll2 = new JScrollPane(createPanel());
add(scroll2);
final JScrollBar scrollBar1 = scroll2.getVerticalScrollBar();
scrollBar1.addAdjustmentListener(new AdjustmentListener() {
@Override
public void adjustmentValueChanged(AdjustmentEvent e) {
System.out.println("JScrollBar's current value = " + scrollBar1.getValue());
}
});
}
public static JPanel createPanel() {
JPanel panel = new JPanel();
panel.setLayout(new GridLayout(0, 1, 1, 1));
panel.add(createButtons("one"));
panel.add(createButtons("two"));
panel.add(createButtons("three"));
panel.add(createButtons("four"));
panel.add(createButtons("five"));
panel.add(createButtons("six"));
panel.add(createButtons("seven"));
panel.add(createButtons("eight"));
panel.add(createButtons("nine"));
panel.add(createButtons("ten"));
panel.add(createButtons("eleven"));
panel.add(createButtons("twelwe"));
return panel;
}
public static JButton createButtons(String text) {
JButton button = new JButton(text);
return button;
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
ListPanel frame = new ListPanel();
frame.setDefaultCloseOperation(EXIT_ON_CLOSE);
//frame.pack();
frame.setSize(270, 200);
frame.setVisible(true);
}
});
}
class PanelRenderer implements ListCellRenderer {
@Override
public Component getListCellRendererComponent(JList list, Object value, int index, boolean isSelected, boolean cellHasFocus) {
JButton renderer = (JButton) value;
renderer.setBackground(isSelected ? Color.red : list.getBackground());
return renderer;
}
}
}
