Draw string and display newlines and tabs as nonprintable characters: isTransparent : Draw String « SWT 2D Graphics « Java Tutorial

1. Java Tutorial
2. SWT 2D Graphics
3. Draw String

void drawString(String string, int x, int y, boolean isTransparent)

If isTransparent is true, GC will use a transparent background, allowing the original background to show through. Otherwise, GC will use an opaque background.

import org.eclipse.swt.SWT;
import org.eclipse.swt.events.PaintEvent;
import org.eclipse.swt.events.PaintListener;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.widgets.Canvas;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;

public class DrawStringTransparent {
  public static void main(String[] args) {
    final Display display = new Display();
    Shell shell = new Shell(display);
    shell.setText("Canvas Example");
    shell.setLayout(new FillLayout());

    Canvas canvas = new Canvas(shell, SWT.NONE);

    canvas.addPaintListener(new PaintListener() {
      public void paintControl(PaintEvent e) {
        e.gc.drawString("www.\njava2s\t.com", 5, 5, true);
        e.gc.drawString("www.\njava2s\t.com", 5, 55, false);

      }
    });

    shell.open();
    while (!shell.isDisposed()) {
      if (!display.readAndDispatch()) {
        display.sleep();
      }
    }
    display.dispose();
  }
}

18.14.Draw String
	18.14.1.	Draw string and display newlines and tabs as nonprintable characters.
	18.14.2.	String with new line and tab
	18.14.3.	Draw string and display newlines and tabs as nonprintable characters: isTransparent
	18.14.4.	Draw string and process newlines and expanding tabs: drawText(String text, int x, int y)
	18.14.5.	Draw string and process newlines and expanding tabs: drawText(String text, int x, int y, boolean isTransparent)
	18.14.6.	Draw string and processing newlines and expanding tabs
	18.14.7.	Get the extent of a string
	18.14.8.	Measure a String