從SWT中建立"print dialog", 當(dāng)call print()時(shí)彈出print dialog
public void print()
{
PrintDialog dialog = new PrintDialog(da.sShell, SWT.NONE);
PrinterData data = dialog.open();
if (data == null) return;
if (data.printToFile) {
data.fileName = "print.out"; // you probably want to ask the user for a filename
}
printer = new Printer(data);
print(printer);
printer.dispose();
}緊接著建立print(Printer printer)
private void print(Printer printer) {
if (printer.startJob("Text")) { // the string is the job name - shows up in the printer's job list
Rectangle trim = printer.computeTrim(0, 0, 0, 0);
//Calculate the scale factor between the screen resolution and printer
// resolution in order to correctly size the image for the printer
Point screenDPI = da.sShell.getDisplay().getDPI();
Point printerDPI = printer.getDPI();
int scaleFactor = printerDPI.x / screenDPI.x;
//int width = image.getImageData().width;
//int height = image.getImageData().height;
/**//* Create printer GC, and create and set the printer font */
gc = new GC(printer);
gc.drawText("some text here", scaleFactor * 20, scaleFactor * 20);
printer.endJob();
gc.dispose();
}
}
完成"print" 之后添加"print preview"。只需要讓"print" method 帶入 2 個(gè)arguments：Device 和 GC
當(dāng)打印時(shí)帶入Printer device 和 包含打印信息的GC。當(dāng)要預(yù)覽時(shí)帶入 Display device 和GC（
drawing on canvas），就是相當(dāng)于把要打印的東西顯示在canvans里。
create all colors, fonts, and images using the correct device，之后運(yùn)行g(shù)c.dispose()
對(duì)于打印的字體的設(shè)置
gc.setFont(new Font())對(duì)于打印的字體的設(shè)置可以參考：
org.eclipse.swt.custom.StyledText
import org.eclipse.swt.SWT;
import org.eclipse.swt.custom.StyleRange;
import org.eclipse.swt.custom.StyledText;
import org.eclipse.swt.graphics.Font;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;
public class SampleStyledText {
Display display = new Display();
Shell shell = new Shell(display);
StyledText styledText;
public SampleStyledText() {
init();
shell.setLayout(new GridLayout());
styledText = new StyledText(shell, SWT.MULTI | SWT.WRAP | SWT.BORDER | SWT.H_SCROLL | SWT.V_SCROLL);
styledText.setLayoutData(new GridData(GridData.FILL_BOTH));
Font font = new Font(shell.getDisplay(), "Courier New", 12, SWT.NORMAL);
styledText.setFont(font);
styledText.setText("123456789\r\nABCDEFGHI");
StyleRange styleRange1 = new StyleRange();
styleRange1.start = 2;
styleRange1.length = 16;
styleRange1.foreground = shell.getDisplay().getSystemColor(SWT.COLOR_BLUE);
styleRange1.background = shell.getDisplay().getSystemColor(SWT.COLOR_YELLOW);
styleRange1.fontStyle = SWT.BOLD;
StyleRange styleRange2 = new StyleRange();
styleRange2.start = 14;
styleRange2.length = 3;
styleRange2.fontStyle = SWT.NORMAL;
styleRange2.foreground = shell.getDisplay().getSystemColor(SWT.COLOR_YELLOW);
styleRange2.background = shell.getDisplay().getSystemColor(SWT.COLOR_BLUE);
// styledText.setStyleRange(styleRange1);
// styledText.setStyleRange(styleRange2);
//styledText.setStyleRanges(new StyleRange[]{styleRange1, styleRange2});
//styledText.setStyleRanges(new StyleRange[]{styleRange2, styleRange1});
//styledText.setLineBackground(1, 1, shell.getDisplay().getSystemColor(SWT.COLOR_GRAY));
// styledText.setSelection(4);
// System.out.println(printStyleRanges(styledText.getStyleRanges()) );
// styledText.insert("000");
System.out.println(printStyleRanges(styledText.getStyleRanges()) );
// styledText.setStyleRanges(new StyleRange[]{styleRange1});
// System.out.println(printStyleRanges(styledText.getStyleRanges()) );
//shell.pack();
shell.setSize(300, 120);
shell.open();
//textUser.forceFocus();
// Set up the event loop.
while (!shell.isDisposed()) {
if (!display.readAndDispatch()) {
// If no more entries in event queue
display.sleep();
}
}
display.dispose();
}
private String printStyleRanges(StyleRange[] styleRanges) {
if(styleRanges == null)
return "null";
else if(styleRanges.length == 0)
return "[]";
StringBuffer sb = new StringBuffer();
for(int i=0; i<styleRanges.length; i++) {
sb.append(styleRanges[i] + "\n");
}
return sb.toString();
}
public static void main(String[] args) {
new SampleStyledText();
}
}
參考：
You will have to think about margins, page breaks, and scaling, and you
may want to think about whether or not the chosen fonts exist on the printer.
For an optimization, you might want to use a set of background images, one
per page, for the display drawing so that your user can flip between the 'pages'
without you having to render them again.
Printing is a lot of work. The widgets don't do it for you - you have to do
all the drawing yourself. Once you have done the work, however, it is a
relatively simple thing to add a "print preview" feature.
The closest thing in SWT to an example of this is the StyledText widget -
have a look at the code in org.eclipse.swt.custom.StyledText. It doesn't do
a print preview specifically, but it does know how to draw itself to the
screen, and to print itself to a printer. Print preview would just be a bit
of a twist on drawing to the screen.