SWT: Button: Create a button

Button widget is used to create a button, and clicked by user to perform some processing.

Ex:

Button button1 = new Button(shell, SWT.PUSH);

button1.setText("Submit");

button1.setLocation(0, 0);

button1.setSize(100, 20);

Above statements create a button with text ‘Submit’. You can also set the style, background, image and more by using set methods.

You can apply following styles to Button element.

Style	Description
SWT.ARROW	Style constant for arrow button behavior
SWT.CHECK	Style constant for check box behavior
SWT.PUSH	Style constant for push button behavior
SWT.RADIO	Style constant for radio button behavior
SWT.TOGGLE	Style constant for toggle button behavior
SWT.FLAT	Style constant for flat appearance.
SWT.WRAP	Style constant for automatic line wrap behavior.
SWT.UP	Style constant for align up behavior
SWT.DOWN	Style constant for align down behavior
SWT.LEFT	Style constant for align left behavior
SWT.RIGHT	Style constant for align right behavior
SWT.CENTER	Style constant for align center behavior

Note

a.   Only one of the styles ARROW, CHECK, PUSH, RADIO, and TOGGLE may be specified.

b.   Only one of the styles LEFT, RIGHT, and CENTER may be specified.

c.    Only one of the styles UP, DOWN, LEFT, and RIGHT may be specified when the ARROW style is specified.

package swt_app;

import org.eclipse.swt.SWT;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Text;

public class Test {

  private static int xPosition = 30;
  private static int yPosition = 30;
  private static int width = 500;
  private static int height = 30;
  private static int scrollWidth = 500;
  private static int scrollHeight = 350;

  private static int shellWidth = 600;
  private static int shellHeight = 600;

  private static void addTextToShell(Display display, Shell shell) {

    Text text1 = new Text(shell, SWT.BORDER);
    text1.setText("You can't edit me");
    text1.setBounds(xPosition, yPosition, width, height);
    text1.setEditable(false);

    yPosition += 40;

    Text text2 = new Text(shell, SWT.BORDER | SWT.H_SCROLL | SWT.V_SCROLL);
    text2.setText("Bordered scrolled text box");
    text2.setBounds(xPosition, yPosition, scrollWidth, scrollHeight);

    yPosition += 80;

    Button button1 = new Button(shell, SWT.PUSH);
    button1.setText("Submit");
    button1.setLocation(xPosition + 130, yPosition + 300);
    button1.setSize(100, 20);

    Button button2 = new Button(shell, SWT.PUSH);
    button2.setText("Cancel");
    button2.setLocation(xPosition + 260, yPosition + 300);
    button2.setSize(100, 20);

  }

  public static void main(String[] args) {

    /* Instantiate Display object, it represents SWT session */
    Display display = new Display();

    /*
     * Define Shell, it represent a window, You can add more than one shell
     * to Display
     */
    Shell shell = new Shell(display);
    shell.setSize(shellWidth, shellHeight);

    addTextToShell(display, shell);

    /* Open shell window */
    shell.open();

    /*
     * Run the event dispatching loop until an exit condition occurs, which
     * is typically when the main shell window is closed by the user.
     */

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

    /* Dispose the display */
    display.dispose();
  }
}

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