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Printing and Preview of Nested JTable not working and performance is slow....

Mohammed Ajmal
Greenhorn

Joined: Sep 20, 2004
Posts: 29
Hi,

I have a problem in printing and preview of JTable which is nested.
I mean to say, that if the table is simple it is printing the contents correctly and also its preview. But if it is a nested, that is table is having another table with its own headers etc.. then the nested table is not getting printed correctly. Only its object is shown, like {com.hyd.nms.detail} instead of its contents.

Could you please help me whether it is possible to print a nested table, and how to take care of the same.

Also, it takes much time to open the preview dialog to display. So ,any tips on improving the performance in java for printing.

Below is the snapshot of code.... which I downloaded from one of the sites.. and using the same.


public class PrintPreview extends JFrame
{
protected int m_wPage;
protected int m_hPage;
protected Printable m_target;
protected JComboBox m_cbScale;
protected PreviewContainer m_preview;


public PrintPreview(Printable target) {
this(target, "Print Preview",PageFormat.PORTRAIT );
}

public PrintPreview(Printable target, String title , int orientation) {
super(title);
setSize(800, 600);
getContentPane().setLayout(new BorderLayout());
m_target = target;

JToolBar tb = new JToolBar();
JButton bt = new JButton("Print");
ActionListener lst = new ActionListener() {

public void actionPerformed(ActionEvent e) {
try {
// Use default printer, no dialog
PrinterJob prnJob = PrinterJob.getPrinterJob();
PageFormat pageFormat = prnJob.defaultPage();

prnJob.setPrintable(m_target , pageFormat);
if (!prnJob.printDialog())
return;
setCursor( Cursor.getPredefinedCursor(
Cursor.WAIT_CURSOR));
prnJob.print();
setCursor( Cursor.getPredefinedCursor(
Cursor.DEFAULT_CURSOR));
dispose();
}

catch (PrinterException ex) {
ex.printStackTrace();
System.err.println("Printing error: "+ex.toString());
}
}
};

bt.addActionListener(lst);
bt.setAlignmentY(0.5f);
bt.setMargin(new Insets(4,6,4,6));
tb.add(bt);
bt = new JButton("Close");
lst = new ActionListener() {
public void actionPerformed(ActionEvent e) {
dispose();
}
};

bt.addActionListener(lst);
bt.setAlignmentY(0.5f);
bt.setMargin(new Insets(2,6,2,6));
tb.add(bt);
String[] scales = { "10 %", "25 %", "50 %", "100 %" };
m_cbScale = new JComboBox(scales);
lst = new ActionListener() {

public void actionPerformed(ActionEvent e) {
Thread runner = new Thread() {

public void run() {
String str = m_cbScale.getSelectedItem().
toString();

if (str.endsWith("%"))
str = str.substring(0, str.length()-1);
str = str.trim();
int scale = 0;
try { scale = Integer.parseInt(str); }
catch (NumberFormatException ex) { ex.printStackTrace(); return; }
int w = (int)(m_wPage*scale/100);
int h = (int)(m_hPage*scale/100);
Component[] comps = m_preview.getComponents();

for (int k=0; k<comps.length; k++) {
if (!(comps[k] instanceof PagePreview))
continue;
PagePreview pp = (PagePreview)comps[k];
pp.setScaledSize(w, h);
}

m_preview.doLayout();
m_preview.getParent().getParent().validate();
}
};

runner.start();
}
};

m_cbScale.addActionListener(lst);
m_cbScale.setMaximumSize(m_cbScale.getPreferredSize());
m_cbScale.setEditable(true);
tb.addSeparator();
tb.add(m_cbScale);
getContentPane().add(tb, BorderLayout.NORTH);
m_preview = new PreviewContainer();
PrinterJob prnJob = PrinterJob.getPrinterJob();

PageFormat pageFormat = prnJob.defaultPage();


if (pageFormat.getHeight()==0 || pageFormat.getWidth()==0) {
System.err.println("Unable to determine default page size");
return;
}

m_wPage = (int)(pageFormat.getWidth());
m_hPage = (int)(pageFormat.getHeight());
int scale = 10;
int w = (int)(m_wPage*scale/100);
int h = (int)(m_hPage*scale/100);
int pageIndex = 0;

try {
while (true) {
BufferedImage img = new BufferedImage(m_wPage,
m_hPage, BufferedImage.TYPE_INT_RGB);
Graphics g = img.getGraphics();
g.setColor(Color.white);
g.fillRect(0, 0, m_wPage, m_hPage);
if (target.print(g, pageFormat, pageIndex) != Printable.PAGE_EXISTS)

break;
PagePreview pp = new PagePreview(w, h, img);
m_preview.add(pp);
pageIndex++;
}
}

catch (PrinterException e) {
e.printStackTrace();
System.err.println("Printing error: "+e.toString());
}

JScrollPane ps = new JScrollPane(m_preview);
getContentPane().add(ps, BorderLayout.CENTER);
setDefaultCloseOperation(DISPOSE_ON_CLOSE);
setVisible(true);
}

class PreviewContainer extends JPanel
{
protected int H_GAP = 16;
protected int V_GAP = 10;
public Dimension getPreferredSize() {
int n = getComponentCount();
if (n == 0)
return new Dimension(H_GAP, V_GAP);
Component comp = getComponent(0);
Dimension dc = comp.getPreferredSize();
int w = dc.width;
int h = dc.height;
Dimension dp = getParent().getSize();
int nCol = Math.max((dp.width-H_GAP)/(w+H_GAP), 1);
int nRow = n/nCol;
if (nRow*nCol < n)
nRow++;
int ww = nCol*(w+H_GAP) + H_GAP;
int hh = nRow*(h+V_GAP) + V_GAP;
Insets ins = getInsets();
return new Dimension(ww+ins.left+ins.right,
hh+ins.top+ins.bottom);
}

public Dimension getMaximumSize() {
return getPreferredSize();
}

public Dimension getMinimumSize() {
return getPreferredSize();
}

public void doLayout() {
Insets ins = getInsets();
int x = ins.left + H_GAP;
int y = ins.top + V_GAP;
int n = getComponentCount();
if (n == 0)
return;
Component comp = getComponent(0);
Dimension dc = comp.getPreferredSize();
int w = dc.width;
int h = dc.height;
Dimension dp = getParent().getSize();
int nCol = Math.max((dp.width-H_GAP)/(w+H_GAP), 1);
int nRow = n/nCol;
if (nRow*nCol < n)
nRow++;
int index = 0;
for (int k = 0; k<nRow; k++) {
for (int m = 0; m<nCol; m++) {
if (index >= n)
return;
comp = getComponent(index++);
comp.setBounds(x, y, w, h);
x += w+H_GAP;
}
y += h+V_GAP;
x = ins.left + H_GAP;
}
}
}

class PagePreview extends JPanel
{
protected int m_w;
protected int m_h;
protected Image m_source;
protected Image m_img;

public PagePreview(int w, int h, Image source) {
m_w = w;
m_h = h;
m_source= source;
m_img = m_source.getScaledInstance(m_w, m_h,
Image.SCALE_SMOOTH);
m_img.flush();
setBackground(Color.white);
setBorder(new MatteBorder(1, 1, 2, 2, Color.black));
}

public void setScaledSize(int w, int h) {
m_w = w;
m_h = h;
m_img = m_source.getScaledInstance(m_w, m_h, Image.SCALE_SMOOTH);
repaint();
}

public Dimension getPreferredSize() {
Insets ins = getInsets();
return new Dimension(m_w+ins.left+ins.right,
m_h+ins.top+ins.bottom);
}

public Dimension getMaximumSize() {
return getPreferredSize();
}

public Dimension getMinimumSize() {
return getPreferredSize();
}

public void paint(Graphics g) {
g.setColor(getBackground());
g.fillRect(0, 0, getWidth(), getHeight());
g.drawImage(m_img, 0, 0, this);
paintBorder(g);

}
}
}



I would appreciate if any comments/help is provided on the same.

Thanks,
Ajmal
 
I agree. Here's the link: http://aspose.com/file-tools
 
subject: Printing and Preview of Nested JTable not working and performance is slow....