Java Tutorial/SWT/Text

Append line to Text

   <source lang="java">

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();
 }

}</source>

Change Text Font

   <source lang="java">

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();
 }

}</source>

Create a multiple-line text field

   <source lang="java">

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();
 }

}</source>

Create a password text field

   <source lang="java">

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();
 }

}</source>

Create a read-only text field

   <source lang="java">

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();
 }

}</source>

Create a right-aligned single-line text field

   <source lang="java">

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();
 }

}</source>

Create a single-line text field

   <source lang="java">

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();
 }

}</source>

Draw on the background of Text

   <source lang="java">

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();
     }
   }
 }

}</source>

Get Caret Position

   <source lang="java">

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();
 }

}</source>

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

   <source lang="java">

/*******************************************************************************

* 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();
 }

}</source>

Select all text in Text

   <source lang="java">

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();
 }

}</source>

Set size for Text

   <source lang="java">

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();
 }

}</source>

Set the selection (start, end)

   <source lang="java">

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();
 }

}</source>

Text: type in one text, output to another

   <source lang="java">

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();
 }

}</source>