实现SWT打印表格与图片功能(ZT)

转载自 http://hi.baidu.com/gridrender/blog/item/0fff0f335b52ef44ac4b5f43.html
源代码下载地址：
参考网址：
（1）http://club.xasoft.org/?uid-167-action-viewspace-itemid-346#xspace-itemreply
（2）http://www.eclipseworld.org/bbs/read-cec-tid-5299-keyword-.html

纯SWT的报表库: SWT Report，支持报表打印功能：
1. 跨行和跨列功能
2. 页码和页数统计
3. 边距和间距调整
4. 各边框颜色设置
5. 前景和背景颜色
6. 自适应页面大小
其中，CustomReportTest 类生成的报表

SWT提供的打印功能很简单，特别是在做表格打印的时候，需要大家使用GC自己绘出来，才能打印，对于初级的开发人员和人力不足的公司来说是非常麻烦的事情。

import org.ceclipse.reporting.IReport;
import org.ceclipse.reporting.IReportPage;
import org.ceclipse.reporting.Report;
import org.ceclipse.reporting.ReportData;
import org.ceclipse.reporting.ReportUtil;
import org.eclipse.nebula.widgets.grid.Grid;
import org.eclipse.swt.printing.PrintDialog;
import org.eclipse.swt.printing.Printer;
import org.eclipse.swt.widgets.Table;
import org.eclipse.ui.PlatformUI;

/**
* 通用表格打印组件，目前提供两个方法分别用于打印表格（Gird,Table）;
* 工作任务名:printContent
* @author lign
*
*/
public class PrintContent {

/**
* 对Gird进行打印操作
* @param grid SWT 的nebula项目的Grid
* @param title 表头文字描述
*/
public static void printGird(Grid grid, String title) {
IReportPage page = ReportUtil.convert(grid, title);
Report report = new Report();
report.addPage(page);
printToPrinter(report);

}

/**
* 对Table进行打印操作
* @param table SWT 的Table
* @param title 表头文字描述
*/
public static void printTable(Table table, String title) {
IReportPage page = ReportUtil.convert(table, title);
Report report = new Report();
report.addPage(page);
printToPrinter(report);

}

/**
* 处理打印以及调用Printer
* @param report
*/
private static void printToPrinter(IReport report) {
ReportData reportData = report.getReportData();
reportData.setJobName("printContent");
reportData.setPrinter(new Printer(new PrintDialog(PlatformUI.getWorkbench

().getActiveWorkbenchWindow().getShell()).open()));
report.print();
}
}

参考网址：
（1）http://club.xasoft.org/?uid-167-action-viewspace-itemid-346#xspace-itemreply
（2）http://www.eclipseworld.org/bbs/read-cec-tid-5299-keyword-.html
（3）http://www.blogjava.net/Javawind/articles/129899.html

和打印文字不同。因为系统中的dpi(dot per inch)和打印机的dpi不同，所以要进行转换。

import org.eclipse.swt.*;
import org.eclipse.swt.graphics.*;
import org.eclipse.swt.printing.*;
import org.eclipse.swt.widgets.*;

/** *//**
* This class demonstrates printing images
*/
public class ImagePrinterExample {
/** *//**
* The application entry point
* @param args the command line arguments
*/
public static void main(String[] args) {
Display display = new Display();
Shell shell = new Shell(display, SWT.NONE);

try {
// Prompt the user for an image file
FileDialog fileChooser = new FileDialog(shell, SWT.OPEN);
String fileName = fileChooser.open();

if (fileName == null) { return; }

// Load the image
ImageLoader loader = new ImageLoader();
ImageData[] imageData = loader.load(fileName);

if (imageData.length > 0) {
// Show the Choose Printer dialog
PrintDialog dialog = new PrintDialog(shell, SWT.NULL);
PrinterData printerData = dialog.open();

if (printerData != null) {
// Create the printer object
Printer printer = new Printer(printerData);

// Calculate the scale factor between the screen resolution and printer
// resolution in order to correctly size the image for the printer
Point screenDPI = display.getDPI();
Point printerDPI = printer.getDPI();
int scaleFactor = printerDPI.x / screenDPI.x;

// Determine the bounds of the entire area of the printer
Rectangle trim = printer.computeTrim(0, 0, 0, 0);

// Start the print job
if (printer.startJob(fileName)) {
if (printer.startPage()) {
GC gc = new GC(printer);
Image printerImage = new Image(printer, imageData[0]);

// Draw the image
gc.drawImage(printerImage, 0, 0, imageData[0].width,
imageData[0].height, -trim.x, -trim.y,
scaleFactor * imageData[0].width,
scaleFactor * imageData[0].height);

// Clean up
printerImage.dispose();
gc.dispose();
printer.endPage();
}
}
// End the job and dispose the printer
printer.endJob();
printer.dispose();
}
}
} catch (Exception e) {
MessageBox messageBox = new MessageBox(shell, SWT.ICON_ERROR);
messageBox.setMessage("Error printing test image");
messageBox.open();
}
}
}