MessageFormat header/footerFormat 如何更改 JTable 打印的字体 [英] MessageFormat header/footerFormat how to change Font for JTable printing
问题描述
关于这个线程 我有一个问题，如果有人知道是否可以为 MessageFormat headerFormat 来自 JTable.PrintMode 否则我必须分别绘制 g2.drawString("my header/footer") 和 JTable#print()
in relation to this thread I have a question if someone to know if is possible to override/change larger font (Font Type, Size, Color) for MessageFormat headerFormat comings with JTable.PrintMode or I must paint g2.drawString("my header/footer") and JTable#print() separatelly
推荐答案
正如大家已经提到的(当我在度假时放松 :-) - TablePrintable 是为了保密而紧密结合的，无法子类化，无法配置标题/页脚打印.钩子的唯一选择是包装表格的默认可打印内容，让它在没有页眉/页脚的情况下工作，并自行打印页眉/页脚.
As everybody already mentioned (while I was relaxing in vacation :-) - TablePrintable is tightly knitted for secrecy, no way to subclass, no way to configure the header/footer printing. The only option to hook is to wrap the table's default printable, let it do its work without header/footer and take over the header/footer printing oneself.
到目前为止显示的片段的问题是它们不能很好地处理多页 - 当然，正如所有作者都知道和提到的那样 - 因为默认的可打印文件认为没有页眉/页脚并自由使用所需的空间被他们.毫不奇怪:-)
The problem with the snippets shown so far is that they dont play nicely with multi-page - as known and mentioned by all authors, of course - because the default printable thinks there are no headers/footers and freely uses the space required by them. Not surprisingly :-)
所以问题是:有没有办法让默认不打印到页眉/页脚的区域?是的，它是:double-wopper (ehh ..wrapper) 是答案 - 通过将给定的 pageFormat 包装成一个返回调整后的 getImageableHeight/Y 的页面格式，让默认的可打印文件相信它的可打印空间更少.类似的东西:
So the question is: is there a way to make to default not print into the region of the header/footer? And yeah, it is: double-wopper (ehh .. wrapper) is the answer - make the default printable believe it has less printable space by wrapping the given pageFormat into one that returns a adjusted getImageableHeight/Y. Something like:
public class CustomPageFormat extends PageFormat {
private PageFormat delegate;
private double headerHeight;
private double footerHeight;
public CustomPageFormat(PageFormat format, double headerHeight, double footerHeight) {
this.delegate = format;
this.headerHeight = headerHeight;
this.footerHeight = footerHeight;
}
/**
* @inherited <p>
*/
@Override
public double getImageableY() {
return delegate.getImageableY() + headerHeight;
}
/**
* @inherited <p>
*/
@Override
public double getImageableHeight() {
return delegate.getImageableHeight() - headerHeight - footerHeight;
}
// all other methods simply delegate
然后在可打印的包装器中使用(页脚必须类似地完成):
Then use in the printable wrapper (footer has to be done similarly):
public class CustomTablePrintable implements Printable {
Printable tablePrintable;
JTable table;
MessageFormat header;
MessageFormat footer;
public CustomTablePrintable(MessageFormat header, MessageFormat footer) {
this.header = header;
this.footer = footer;
}
public void setTablePrintable(JTable table, Printable printable) {
tablePrintable = printable;
this.table = table;
}
@Override
public int print(Graphics graphics, PageFormat pageFormat,
int pageIndex) throws PrinterException {
// grab an untainted graphics
Graphics2D g2d = (Graphics2D)graphics.create();
// calculate the offsets and wrap the pageFormat
double headerOffset = calculateHeaderHeight(g2d, pageIndex);
CustomPageFormat wrappingPageFormat = new CustomPageFormat(pageFormat, headerOffset, 0);
// feed the wrapped pageFormat into the default printable
int exists = tablePrintable.print(graphics, wrappingPageFormat, pageIndex);
if (exists != PAGE_EXISTS) {
g2d.dispose();
return exists;
}
// translate the graphics to the start of the original pageFormat and draw header
g2d.translate(pageFormat.getImageableX(), pageFormat.getImageableY());
printHeader(g2d, pageIndex, (int) pageFormat.getImageableWidth());
g2d.dispose();
return PAGE_EXISTS;
}
protected double calculateHeaderHeight(Graphics2D g, int pageIndex) {
if (header == null) return 0;
Object[] pageNumber = new Object[]{new Integer(pageIndex + 1)};
String text = header.format(pageNumber);
Font headerFont = table.getFont().deriveFont(Font.BOLD, 18f);
g.setFont(headerFont);
Rectangle2D rect = g.getFontMetrics().getStringBounds(text, g);
return rect.getHeight();
}
protected void printHeader(Graphics2D g, int pageIndex, int imgWidth) {
Object[] pageNumber = new Object[]{new Integer(pageIndex + 1)};
String text = header.format(pageNumber);
Font headerFont = table.getFont().deriveFont(Font.BOLD, 18f);
g.setFont(headerFont);
Rectangle2D rect = g.getFontMetrics().getStringBounds(text, g);
// following is c&p from TablePrintable printText
int tx;
// if the text is small enough to fit, center it
if (rect.getWidth() < imgWidth) {
tx = (int) ((imgWidth - rect.getWidth()) / 2);
// otherwise, if the table is LTR, ensure the left side of
// the text shows; the right can be clipped
} else if (table.getComponentOrientation().isLeftToRight()) {
tx = 0;
// otherwise, ensure the right side of the text shows
} else {
tx = -(int) (Math.ceil(rect.getWidth()) - imgWidth);
}
int ty = (int) Math.ceil(Math.abs(rect.getY()));
g.setColor(Color.BLACK);
g.drawString(text, tx, ty);
}
}
最后从表的 getPrintable 返回它，例如:
And at the end return that from table's getPrintable, like:
final JTable table = new JTable(myModel){
/**
* @inherited <p>
*/
@Override
public Printable getPrintable(PrintMode printMode,
MessageFormat headerFormat, MessageFormat footerFormat) {
Printable printable = super.getPrintable(printMode, null, null);
CustomTablePrintable custom = new CustomTablePrintable(headerFormat, footerFormat);
custom.setTablePrintable(this, printable);
return custom;
}
};
printHeader/Footer 可以被实现来做任何需要的事情.
printHeader/Footer can be implemented to do whatever is required.
归根结底:我是否需要调用 g.drawString(...)"这个问题的答案仍然是是".但至少它安全地在桌子外面:-)
At the end of the day: the answer to the question "do I need to call g.drawString(...)" still is "Yes". But at least it's safely outside of the table itself :-)
这篇关于MessageFormat header/footerFormat 如何更改 JTable 打印的字体的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
