Java Tutorial/SWT/Text

Append line to Text

import org.eclipse.swt.SWT;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Text;
public class TextAppendLine {
  public static void main(String[] args) {
    Display display = new Display();
    Shell shell = new Shell(display);
    Text text = new Text(shell, SWT.BORDER | SWT.V_SCROLL);
    text.setBounds(10, 10, 100, 100);
    for (int i = 0; i < 16; i++) {
      text.append("Line " + i + "\n");
    }
    shell.open();
    while (!shell.isDisposed()) {
      if (!display.readAndDispatch())
        display.sleep();
    }
    display.dispose();
  }
}

Change Text Font

import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.Font;
import org.eclipse.swt.graphics.FontData;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Text;
public class FontTextChange {
  public static void main(String[] args) {
    Display display = new Display();
    Shell shell = new Shell(display);
    Text text = new Text(shell, SWT.MULTI|SWT.BORDER);
    text.setBounds(10, 10, 150, 150);
    Font initialFont = text.getFont();
    FontData[] fontData = initialFont.getFontData();
    for (int i = 0; i < fontData.length; i++) {
      fontData[i].setHeight(24);
    }
    Font newFont = new Font(display, fontData);
    text.setFont(newFont);
    shell.open();
    while (!shell.isDisposed()) {
      if (!display.readAndDispatch())
        display.sleep();
    }
    newFont.dispose();
    display.dispose();
  }
}

Create a multiple-line text field

import org.eclipse.swt.SWT;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Text;
public class CreateMultipleLineText {
  public static void main(String[] args) {
    Display display = new Display();
    Shell shell = new Shell(display);
    shell.setLayout(new FillLayout());
    // Create a multiple-line text field
    Text t = new Text(shell, SWT.MULTI | SWT.BORDER | SWT.WRAP | SWT.V_SCROLL);
    t.setLayoutData(new GridData(GridData.FILL_BOTH));
    
    
    
    shell.open();
    while (!shell.isDisposed()) {
      if (!display.readAndDispatch()) {
        display.sleep();
      }
    }
    display.dispose();
  }
}

Create a password text field

import org.eclipse.swt.SWT;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Text;
public class PasswordFieldTextExample {
  public static void main(String[] args) {
    Display display = new Display();
    Shell shell = new Shell(display);
    shell.setLayout(new GridLayout(1, false));

    // Create a password text field
    new Text(shell, SWT.PASSWORD | SWT.BORDER);

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

Create a read-only text field

import org.eclipse.swt.SWT;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Text;
public class ReadOnlyTextExample {
  public static void main(String[] args) {
    Display display = new Display();
    Shell shell = new Shell(display);
    shell.setLayout(new GridLayout(1, false));

    // Create a read-only text field
    new Text(shell, SWT.READ_ONLY | SWT.BORDER).setText("Read Only");

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

Create a right-aligned single-line text field

import org.eclipse.swt.SWT;
import org.eclipse.swt.layout.*;
import org.eclipse.swt.widgets.*;
public class RightalignTextExample {
  public static void main(String[] args) {
    Display display = new Display();
    Shell shell = new Shell(display);
    shell.setLayout(new GridLayout(1, false));

    // Create a right-aligned single-line text field
    new Text(shell, SWT.RIGHT | SWT.BORDER);

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

Create a single-line text field

import org.eclipse.swt.SWT;
import org.eclipse.swt.layout.*;
import org.eclipse.swt.widgets.*;
public class SingleLinefieldTextExample {
  public static void main(String[] args) {
    Display display = new Display();
    Shell shell = new Shell(display);
    shell.setLayout(new GridLayout(1, false));

    // Create a single-line text field
    new Text(shell, SWT.BORDER);

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

Draw on the background of Text

import org.eclipse.swt.SWT;
import org.eclipse.swt.events.TraverseEvent;
import org.eclipse.swt.events.TraverseListener;
import org.eclipse.swt.graphics.Font;
import org.eclipse.swt.graphics.GC;
import org.eclipse.swt.graphics.Rectangle;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Text;
public class TextBackgroundDraw {
  public static void main(String[] args) {
    final Display display = new Display();
    Shell shell = new Shell(display);
    shell.setLayout(new FillLayout());
    final Text text = new Text(shell, SWT.SINGLE | SWT.BORDER);
    text.setText("press tab to draw");
    text.addTraverseListener(new TraverseListener() {
      public void keyTraversed(TraverseEvent e) {
        if (e.detail == SWT.TRAVERSE_TAB_NEXT || e.detail == SWT.TRAVERSE_TAB_PREVIOUS) {
          e.doit = true;
          GC gc = new GC(text);
          // Erase background first.
          Rectangle rect = text.getClientArea();
          gc.fillRectangle(rect.x, rect.y, rect.width, rect.height);
          Font font = new Font(display, "Arial", 32, SWT.BOLD);
          gc.setFont(font);
          gc.drawString("tab event", 15, 10);
          gc.dispose();
        }
      }
    });
    shell.open();
    while (!shell.isDisposed()) {
      if (!display.readAndDispatch()) {
        display.sleep();
      }
    }
  }
}

Get Caret Position

import org.eclipse.swt.SWT;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Text;
public class CaretPosition {
  public static void main(String[] args) {
    Display display = new Display();
    Shell shell = new Shell(display);
    Text text = new Text(shell, SWT.BORDER | SWT.V_SCROLL);
    text.setBounds(10, 10, 100, 100);
    text.append("Line \n");
    text.setSelection(30);
    System.out.println("selection=" + text.getSelection());
    System.out.println("caret position=" + text.getCaretPosition());
    System.out.println("caret location=" + text.getCaretLocation());
    shell.open();
    while (!shell.isDisposed()) {
      if (!display.readAndDispatch())
        display.sleep();
    }
    display.dispose();
  }
}

Introducing Text and Text Styles

SWT offers the Text class for text-entry fields.

StyleDescriptionSWT.MULTICreates a multiple-line text field.SWT.SINGLECreates a single-line text field. This is the default. You may specifiy only one of SWT.MULTI or SWT.SINGLE.SWT.READ_ONLYCreates a text field with uneditable contents.SWT.WRAPWith multiple-line text fields, causes text to wrap.SWT.BORDERDraws a border around the text field. Note that this style isn"t set by default, and your text fields will look funny without it.SWT.CENTERCenters the text in this text field.SWT.LEFTLeft-aligns the text in this text field. This is the default.SWT.RIGHTRight-aligns the text in this text field. You may specify only one of SWT.CENTER, SWT.LEFT, or SWT.RIGHT.SWT.PASSWORDCreates a text field suitable for password entry-it doesn"t display the actual characters the user types, but rather it displays asterisks.SWT.H_SCROLLCreates a horizontal scrollbar to scroll this text field.SWT.V_SCROLLCreates a vertical scrollbar to scroll this text field.

SWT.SINGLE | SWT.LEFT is set by default

Resize a text control

/*******************************************************************************
 * Copyright (c) 2000, 2004 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
 
 
import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.FontMetrics;
import org.eclipse.swt.graphics.GC;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Text;
public class TextControlResize {
  public static void main(String[] args) {
    Display display = new Display();
    Shell shell = new Shell(display);
    Text text = new Text(shell, SWT.BORDER);
    int columns = 10;
    GC gc = new GC(text);
    FontMetrics fm = gc.getFontMetrics();
    int width = columns * fm.getAverageCharWidth();
    int height = fm.getHeight();
    gc.dispose();
    text.setSize(text.ruputeSize(width, height));
    shell.pack();
    shell.open();
    while (!shell.isDisposed()) {
      if (!display.readAndDispatch())
        display.sleep();
    }
    display.dispose();
  }
}

Select all text in Text

import org.eclipse.swt.SWT;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Text;
public class TextTextSelection {
  public static void main(String[] args) {
    Display display = new Display();
    Shell shell = new Shell(display);
    shell.setLayout(new FillLayout());
    final Text t = new Text(shell, SWT.BORDER | SWT.MULTI);
    t.setText("here is some text to be selected");
    
    t.selectAll();
    shell.setSize(200, 200);
    shell.open();
    while (!shell.isDisposed()) {
      if (!display.readAndDispatch())
        display.sleep();
    }
    display.dispose();
  }
}

Set size for Text

import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Text;
public class TextSetSize {
  public static void main(String[] args) {
    Display display = new Display();
    Shell shell = new Shell(display);
    Text text = new Text(shell, 0);
    text.setText("ASDF");
    text.setSize(64, 32);
    shell.pack();
    shell.open();
    while (!shell.isDisposed()) {
      if (!display.readAndDispatch())
        display.sleep();
    }
    display.dispose();
  }
}

Set the selection (start, end)

import org.eclipse.swt.SWT;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Text;
public class SelectionStartEnd {
  public static void main(String[] args) {
    Display display = new Display();
    Shell shell = new Shell(display);
    Text text = new Text(shell, SWT.BORDER | SWT.V_SCROLL);
    text.setBounds(10, 10, 400, 100);
    text.append("text text text text text text text text text text text text text ");
    shell.open();
    text.setSelection(30, 38);
    System.out.println("selection=" + text.getSelection());
    System.out.println("caret position=" + text.getCaretPosition());
    System.out.println("caret location=" + text.getCaretLocation());
    while (!shell.isDisposed()) {
      if (!display.readAndDispatch())
        display.sleep();
    }
    display.dispose();
  }
}

Text: type in one text, output to another

import org.eclipse.swt.SWT;
import org.eclipse.swt.events.VerifyEvent;
import org.eclipse.swt.events.VerifyListener;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Text;
public class TextLink {
  public static void main(String[] args) {
    final Display display = new Display();
    Shell shell = new Shell(display);
    shell.setLayout(new FillLayout());
    final Text text0 = new Text(shell, SWT.BORDER | SWT.H_SCROLL | SWT.V_SCROLL);
    final Text text1 = new Text(shell, SWT.BORDER | SWT.H_SCROLL | SWT.V_SCROLL);
    
    text0.addVerifyListener(new VerifyListener() {
      public void verifyText(VerifyEvent event) {
        text1.setTopIndex(text0.getTopIndex());
        text1.setSelection(event.start, event.end);
        text1.insert(event.text);
      }
    });
    
    shell.setBounds(10, 10, 200, 200);
    shell.open();
    
    while (!shell.isDisposed()) {
      if (!display.readAndDispatch())
        display.sleep();
    }
    
    display.dispose();
  }
}