Java Tutorial/SWT 2D Graphics/Draw String

Draw string and display newlines and tabs as nonprintable characters.

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

Draw string and display newlines and tabs as nonprintable characters: isTransparent

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

Draw string and processing newlines and expanding tabs

void drawText(String text, int x, int y, int flags)

Draw string and process newlines and expanding tabs: drawText(String text, int x, int y)

void drawText(String text, int x, int y)

Draw string and process newlines and expanding tabs: drawText(String text, int x, int y, boolean isTransparent)

void drawText(String text, int x, int y, boolean isTransparent)

Get the extent of a string

import org.eclipse.swt.SWT;
import org.eclipse.swt.custom.ControlEditor;
import org.eclipse.swt.events.ControlAdapter;
import org.eclipse.swt.events.ControlEvent;
import org.eclipse.swt.events.PaintEvent;
import org.eclipse.swt.events.PaintListener;
import org.eclipse.swt.events.SelectionAdapter;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.graphics.Font;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.widgets.Canvas;
import org.eclipse.swt.widgets.rubo;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;
public class FontSizeString {
  private static final String STRING = "www.jexp.ru";
  private static final String[] SIZES = { "8", "10", "12", "14", "16", "18" };
  private static Font font;
  public static void main(String[] a) {
    Display display = new Display();
    final Shell shell = new Shell(display);
    shell.setText("Extents");
    final Canvas canvas = new Canvas(shell, SWT.NONE);
    shell.addControlListener(new ControlAdapter() {
      public void controlResized(ControlEvent event) {
        canvas.setBounds(shell.getClientArea());
      }
    });
    canvas.addPaintListener(new PaintListener() {
      public void paintControl(PaintEvent event) {
        event.gc.setFont(font);
        Point pt = event.gc.stringExtent(STRING);
        System.out.println(pt);
      }
    });
    // Create an editor to house the dropdown
    ControlEditor editor = new ControlEditor(canvas);
    // Create the combo and fill it
    final Combo combo = new Combo(canvas, SWT.READ_ONLY);
    for (int i = 0, n = SIZES.length; i < n; i++) {
      combo.add(SIZES[i]);
    }
    // Set up the editor
    editor.horizontalAlignment = SWT.CENTER;
    editor.verticalAlignment = SWT.TOP;
    Point size = combo.ruputeSize(SWT.DEFAULT, SWT.DEFAULT);
    editor.minimumWidth = size.x;
    editor.minimumHeight = size.y;
    editor.setEditor(combo);
    combo.addSelectionListener(new SelectionAdapter() {
      public void widgetSelected(SelectionEvent event) {
        if (font != null)
          font.dispose();
        font = new Font(shell.getDisplay(), "Helvetica", new Integer(combo.getText()).intValue(),
            SWT.BOLD);
        canvas.redraw();
      }
    });
    // Select the first item in the combo
    combo.select(0);
    shell.open();
    while (!shell.isDisposed()) {
      if (!display.readAndDispatch()) {
        display.sleep();
      }
    }
    if (font != null)
      font.dispose();
    display.dispose();
  }
}

Measure a String

import org.eclipse.swt.graphics.GC;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;
public class MeasureString {
  public static void main(String[] args) {
    Display display = new Display();
    Shell shell = new Shell(display);

    GC gc = new GC(shell);
    Point size = gc.textExtent("Hellooooooooooooooooooooo");
    System.out.println("Hello -> " + size);
    shell.pack();
    shell.open();
    
    while (!shell.isDisposed()) {
      if (!display.readAndDispatch())
        display.sleep();
    }
    display.dispose();
  }
}

String with new line and tab

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 DrawStringLineTabSWT {
  public static void main(String[] args) {
    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.\njexp\t.ru", 5, 5);
      }
    });
    shell.open();
    while (!shell.isDisposed()) {
      if (!display.readAndDispatch()) {
        display.sleep();
      }
    }
    display.dispose();
  }
}