8.6. Creating Button and Text Widgets
Problem
You need to use buttons to interact with the user and to display text in your application.
Solution
Use SWT button and text widgets and use SWT listeners to catch button events.
Discussion
This example adds SWT button widgets to a shell and catches click
events, displaying a message in a text widget when the button is
clicked. We’ll start by creating a button widget in
a new project, ButtonApp
.
Here’s a selection of some of the most popular
button widget methods:
-
void addSelectionListener(SelectionListener listener)
Adds the listener to the collection of listeners who will be notified when the button is selected
-
String getText( )
Returns the button’s text
-
void setBounds(int x, int y, int width, int height)
Sets the button’s size and location to the area specified by the arguments
-
void setImage(Image image)
Sets the button’s image
-
void setText(String string)
Sets the button’s text
Creating button widgets is easy enough; just use the
Button
class’s constructor,
position the button with setBounds
or a layout,
and set the caption in the button with the setText
method:
package org.cookbook.ch08; import org.eclipse.swt.widgets.*; import org.eclipse.swt.SWT; import org.eclipse.swt.events.*; public class ButtonClass { public static void main(String [] args) { Display display = new Display( ); Shell shell = new Shell(display); shell.setSize(200, 200); shell.setText("Button Example"); final Button button = new Button(shell, SWT.PUSH); button.setBounds(40, ...
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