我的 Printable Swing 组件的所有部分都无法打印 [英] All parts of my Printable Swing component doesn't print
问题描述
我正在尝试制作可打印组件(发票文档).我使用 JComponent
而不是 JPanel
因为我不想要背景.该组件有许多子组件.
I'm trying to do a printable component (an invoice document). I use JComponent
instead of JPanel
because I don't want a background. The component has many subcomponents.
主要组件实现了 Printable 并有一个调用 printAll(g)
的 print
方法,以便打印所有子组件.但我的子组件不打印.
The main component implements Printable and has a print
-method that is calling printAll(g)
so that all subcomponents should be printed. But my subcomponents doesn't print.
我错过了什么?是否所有子组件也必须实现 Printable?
What am I missing? Does all subcomponents also has to implement Printable?
在我下面的代码中,TopHeader 没有打印出来.
In my code below, the TopHeader is not printed.
import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.GridLayout;
import java.awt.print.PageFormat;
import java.awt.print.Printable;
import java.awt.print.PrinterException;
import java.awt.print.PrinterJob;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;
public class PPanel extends JComponent implements Printable {
static double w;
static double h;
public PPanel() {
this.setLayout(new BorderLayout());
this.add(new JLabel("Document Body"), BorderLayout.CENTER);
this.add(new TopHeader(), BorderLayout.NORTH);
}
class TopHeader extends JComponent {
public TopHeader() {
this.setLayout(new BorderLayout());
JLabel companyName = new JLabel("Company name");
JLabel docType = new JLabel("Document type");
this.add(companyName, BorderLayout.WEST);
this.add(docType, BorderLayout.EAST);
}
}
public static void main(String[] args) {
final PPanel p = new PPanel();
PrinterJob job = PrinterJob.getPrinterJob();
job.setPrintable(p);
try {
job.print();
} catch (PrinterException ex) {
// print failed
}
// Preview
new JFrame() {{ getContentPane().add(p); this.setSize((int)w, (int)h); setVisible(true); }};
}
@Override
public int print(Graphics g, PageFormat pf, int page)
throws PrinterException {
if (page > 0) {
return NO_SUCH_PAGE;
}
Graphics2D g2d = (Graphics2D)g;
g2d.translate(pf.getImageableX(), pf.getImageableY());
w = pf.getImageableWidth();
h = pf.getHeight();
this.setSize((int)w, (int)h);
this.setPreferredSize(new Dimension((int)w, (int)h));
this.doLayout();
this.printAll(g);
return PAGE_EXISTS;
}
}
推荐答案
您可能会遍历 getComponents()
返回的 Component[]
,但这是一个简单的权宜之计如下所示.请注意屏幕预览和打印输出之间的区别.另外,请注意 validate()
的使用优先于 doLayout()
.最后,为了方便预览,本例实现了使用打印设置对话框.
You could probably loop through the Component[]
returned by getComponents()
, but a simple expedient is shown below. Note the difference between the screen preview and the printout. Also, note the use of validate()
in preference to doLayout()
. Finally, as a convenience for previewing, this example implements Using Print Setup Dialogs.
附录:您还可以查看Printing支持 Swing 组件并比较此示例中采用的方法.
Addendum: You might also look at Printing Support in Swing Components and compare the approach taken in this example.
import java.awt.*;
import java.awt.print.*;
import javax.swing.*;
public class PPanel extends JComponent implements Printable {
private JComponent top = new TopHeader();
private JComponent mid = new JLabel("Document Body");
public PPanel() {
this.setLayout(new BorderLayout());
this.add(top, BorderLayout.NORTH);
this.add(mid, BorderLayout.CENTER);
}
private static class TopHeader extends JComponent {
public TopHeader() {
this.setLayout(new BorderLayout());
JLabel companyName = new JLabel("Company name");
JLabel docType = new JLabel("Document type");
this.add(companyName, BorderLayout.WEST);
this.add(docType, BorderLayout.EAST);
}
}
@Override
public int print(Graphics g, PageFormat pf, int page)
throws PrinterException {
if (page > 0) {
return NO_SUCH_PAGE;
}
Graphics2D g2d = (Graphics2D)g;
g2d.translate(pf.getImageableX(), pf.getImageableY());
int w = (int)pf.getImageableWidth();
int h = (int)pf.getImageableHeight();
top.setSize(new Dimension(w, top.getPreferredSize().height));
this.setSize(w, h);
this.validate();
this.printAll(g2d);
return PAGE_EXISTS;
}
public static void main(String[] args) {
final PPanel p = new PPanel();
// Preview before print()
new JFrame() {
{
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
this.add(p);
this.pack();
this.setVisible(true);
}
};
PrinterJob pj = PrinterJob.getPrinterJob();
PageFormat pf = pj.pageDialog(pj.defaultPage());
pj.setPrintable(p, pf);
if (pj.printDialog()) {
try {
pj.print();
} catch (PrinterException pe) {
pe.printStackTrace();
}
}
}
}
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