JTable how to change BackGround Color
Solution 1:
since I search for different suggestion I closed this question with my original knowledges about Graphics
based on code
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.image.BufferedImage;
//import java.awt.image.ColorModel; // I don't know how to use that
//import java.awt.image.SampleModel;// I don't know how to use that
import javax.swing.*;
import javax.swing.RepaintManager;
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 boolean topOrBottom = false;
private GradientViewPortOriginal tableViewPort;
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);
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);
}
}
Solution 2:
Something like this... a bit of a hack.
class GradientViewPort extends JScrollPane {
private static final long serialVersionUID = 1L;
private final int h = 50;
private BufferedImage img = null;
private BufferedImage imgBottom = null;
private BufferedImage shadow = new BufferedImage(1, h,
BufferedImage.TYPE_INT_ARGB);
private BufferedImage shadowBottom = new BufferedImage(1, h,
BufferedImage.TYPE_INT_ARGB);
private JViewport viewPort;
public GradientViewPort(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);
createShadow(new Color(250, 150, 150),shadow);
createShadow(Color.BLUE,shadowBottom);
}
private void createShadow(Color color, BufferedImage shadow) {
Graphics2D g2 = shadow.createGraphics();
g2.setPaint(color);
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(0.5f, 0.8f, 0.8f, 0.5f)));
g2.fillRect(0, 0, 1, h);
g2.dispose();
}
@Override
public void paint(Graphics g) {
paintTop(g,img);
paintBottom(g,imgBottom);
}
private void paintBottom(Graphics g,BufferedImage img) {
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(shadowBottom, bounds.x, -bounds.y - y - h, null);
g2.scale(1, -1);
g2.drawImage(shadowBottom, bounds.x, bounds.y + bounds.height - h + y, null);
g2.dispose();
g.drawImage(img, 0, 0, null);
}
private void paintTop(Graphics g,BufferedImage img) {
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);
}
EDIT fixed the code so when first and last row are in the view port the color is red when they are not the color is blue.
class GradientViewPort extends JScrollPane {
private static final long serialVersionUID = 1L;
private final int h = 50;
private BufferedImage imgRed = null;
private BufferedImage imgBlue = null;
private BufferedImage shadowRed = new BufferedImage(1, h,
BufferedImage.TYPE_INT_ARGB);
private BufferedImage shadowBlue = new BufferedImage(1, h,
BufferedImage.TYPE_INT_ARGB);
private JViewport viewPort;
private boolean recVisible = true;
public GradientViewPort(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);
createShadow(new Color(250, 150, 150),shadowRed);
createShadow(Color.BLUE,shadowBlue);
final JTable table = (JTable) com;
viewport.addChangeListener(new ChangeListener() {
@Override
public void stateChanged(ChangeEvent e) {
Rectangle RECT = table.getCellRect(0, 0, true);
Rectangle viewRect = viewport.getViewRect();
if (viewRect.intersects(RECT)) {
System.out.println("Visible RECT -> " + RECT);
recVisible = true;
} else {
recVisible = false;
}
}
});
}
private void createShadow(Color color, BufferedImage shadow) {
Graphics2D g2 = shadow.createGraphics();
g2.setPaint(color);
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(0.5f, 0.8f, 0.8f, 0.5f)));
g2.fillRect(0, 0, 1, h);
g2.dispose();
}
@Override
public void paint(Graphics g) {
if(recVisible){
paintShadow(g,imgRed,shadowRed);
} else {
paintShadow(g,imgBlue,shadowBlue);
}
}
private void paintShadow(Graphics g,BufferedImage img, BufferedImage shadow) {
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);
}
}
