The Event Model : SWT Event « SWT « Java Tutorial

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Java Tutorial » SWT » SWT Event

17. 89. 2. The Event Model

SWT uses the observer design pattern based event model.
Multiple listeners can be registered to be notified.
In SWT, only Widgets and Displays can have event listeners.

The following code demonstrates usage of a listener:


import org.eclipse.swt.SWT;

import org.eclipse.swt.events.SelectionEvent;

import org.eclipse.swt.events.SelectionListener;

import org.eclipse.swt.layout.FillLayout;

import org.eclipse.swt.widgets.Button;

import org.eclipse.swt.widgets.Display;

import org.eclipse.swt.widgets.Shell;



public class EventModelPattern {

  static Display display = new Display();



  public static void main(String[] args) {

    Shell shell = new Shell(display);

    shell.setLayout(new FillLayout());



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

    button.setText("push me");

    button.addSelectionListener(new SelectionListener() {

      public void widgetDefaultSelected(SelectionEvent e) {

      }



      public void widgetSelected(SelectionEvent e) {

        System.out.println("Button pushed.");

      }

    });



    shell.open();

    while (!shell.isDisposed()) { // Event loop.

      if (!display.readAndDispatch())

        display.sleep();

    }

    display.dispose();

  }

}

17. 89. SWT Event
	17. 89. 1.	Events
	17. 89. 2.	The Event Model
	17. 89. 3.	The listener notification process
	17. 89. 4.	SWT provides two kinds of event listening mechanism: typed and untyped.
	17. 89. 5.	Untyped Events and Untyped Event Listeners
	17. 89. 6.	Introducing Untyped Listeners
	17. 89. 7.	Get event type
	17. 89. 8.	implements general Event Listener
	17. 89. 9.	Introducing Typed Listeners
	17. 89. 10.	Typed Listeners
	17. 89. 11.	SWT Message Keys and Values
	17. 89. 12.	Using SelectionListener
	17. 89. 13.	Add Resize listener to Shell
	17. 89. 14.	Add addPaintListener to Composite
	17. 89. 15.	Add default selection listener to Combo
	17. 89. 16.	Using HelpListener
	17. 89. 17.	Demonstrate DisposeListener which is notified on the associated widget's disposal
	17. 89. 18.	Using ControlListener
	17. 89. 19.	Using FocusListener
	17. 89. 20.	Using VerifyListener
	17. 89. 21.	Using ModifyListener
	17. 89. 22.	Adding AccessibleListener
	17. 89. 23.	Adding AccessibleControlListener
	17. 89. 24.	Add and remove filter listeners

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