Through event-driven, create different parts

Mar 29 posted in Java (RSS), comments.

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A very easy thing is to dispose the first re-create.

Written mainly to see if they have a better realization method

import org.eclipse.swt.SWT;
import org.eclipse.swt.custom.CCombo;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.events.SelectionListener;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Label;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Text;
/**
 *  The program purpose: event-driven, dynamically created components simple demo.  
 *  Select Yes when: choose from the drop-down box.  
 *  Select "no" when you are making a specific text configuration  
 * @author Administrator
 */
public class MyComposite {

        private  Button useOutSourceButton;
        private  Button newSourceButton;
        private  Composite dbSourceComposite;
        private  Shell shell;

        /**
         *  The main program  
         * @param args
         */
        public static void main(String[] args) {
                MyComposite myComposite = new MyComposite();

                myComposite.open();
        }

        /**
         * shell
         */
        private void open() {
                Display display = Display.getDefault();
                shell = new Shell(display);
                shell.setText(" Component replacement test  ");
                shell.setSize(400, 200);
                shell.setLayout(new GridLayout(3, false));

                final Label label = new Label(shell, SWT.NONE);
                label.setLayoutData(new GridData(100, SWT.DEFAULT));
                label.setText(" Use the database resources  ");

                useOutSourceButton = new Button(shell, SWT.RADIO);
                useOutSourceButton.setText(" Is  ");
                newSourceButton = new Button(shell, SWT.RADIO);
                newSourceButton.setText(" No  ");

                dbSourceComposite = new Composite(shell, SWT.NONE);
                dbSourceComposite.setLayoutData(new GridData(SWT.FILL, SWT.CENTER,true, false,3,1));
                dbSourceComposite.setLayout(new GridLayout(3,false));

                createInnerListeners();

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

        }

        /**
         *  Event listener  
         */
        protected void createInnerListeners() {
                useOutSourceButton.addSelectionListener(new SelectionListener() {
                        public void widgetSelected(SelectionEvent e) {
                                Button btn = (Button) e.getSource();
                                if (btn.getSelection()) {
                                        initSelectDBSourceUI(dbSourceComposite);
                                }
                        }

                        public void widgetDefaultSelected(SelectionEvent e) {
                        }
                });
                newSourceButton.addSelectionListener(new SelectionListener() {
                        public void widgetSelected(SelectionEvent e) {
                                Button btn = (Button) e.getSource();
                                if (btn.getSelection()) {
                                        initConfigDBSourceUI(dbSourceComposite);
                                }
                        }

                        public void widgetDefaultSelected(SelectionEvent e) {
                        }
                });
        }

        /**
         *  Create part Group 1  
         * @param composite
         */
        private void initConfigDBSourceUI(final Composite composite) {
                this.disposedComposite(composite);
                Text configureText = new Text(composite, SWT.BORDER);
                configureText.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, true,
                                false));
                configureText.setEditable(false);
                Button configureButton = new Button(composite, SWT.NONE);
                configureButton.setText(" Configuration  ");
                Button resetButton = new Button(composite, SWT.NONE);
                resetButton.setText(" Reset  ");
                shell.layout(true, true);
        }

        /**
         *  Create part Group 2  
         * @param composite
         */
        private void initSelectDBSourceUI(final Composite composite) {
                this.disposedComposite(composite);
                Label dbTypeLabel = new Label(composite, SWT.NONE);
                dbTypeLabel.setText(" Database resource name  ");
                dbTypeLabel.setLayoutData(new GridData(100, SWT.DEFAULT));
                dbTypeLabel.setToolTipText(" Select an existing database resources  ");

                CCombo dbCombo = new CCombo(composite, SWT.BORDER);
                dbCombo.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, true, false));
                dbCombo.setEditable(false);

                Button resetButton = new Button(composite, SWT.NONE);
                resetButton.setText(" Reset  ");
                shell.layout(true, true);
        }
        
        /**
         *  Destroy the original parts  
         * @param composite
         */
        private void disposedComposite(Composite composite) {
                Control[] arrays = composite.getChildren();
                for (Control control : arrays) {
                        if (control != null)
                                control.dispose();
                }
        }
}