Eclipse插件开发系列7.TreeViewer的使用(1)

/*
 * @author 陈刚 ,2004-8-21 0:54:20
 * Email: glchengang@yeah.net
 * Blog : glchengang.yeah.net
 */
package book.c3.e1;

import org.eclipse.jface.viewers.ILabelProvider;
import org.eclipse.jface.viewers.ILabelProviderListener;
import org.eclipse.jface.viewers.ITreeContentProvider;
import org.eclipse.jface.viewers.TreeViewer;
import org.eclipse.jface.viewers.Viewer;
import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;

public class S3_1 {

    public static void main(String[] args) {
        S3_1 window = new S3_1();
        window.open();
    }

    public void open() {
        final Display display = new Display();
        final Shell shell = new Shell();
        shell.setLayout(new FillLayout());
        ui(shell);
        shell.open();
        while (!shell.isDisposed()) {
            if (!display.readAndDispatch())
                display.sleep();
        }
    }

    private void ui(Shell shell) {
        Composite c = new Composite(shell, SWT.NONE);
        c.setLayout(new FillLayout());

        TreeViewer tv = new TreeViewer(c, SWT.BORDER);
        tv.setContentProvider(new MyContentProvider());
        tv.setLabelProvider(new MyLableProvider());
        tv.setInput(new Object());//设置输入对象的方法与前面相同

    }

    /**
     * 内容提供器。由它决定那些对象应该输出在TreeViewer里显示
     */
    private static final class MyContentProvider implements ITreeContentProvider {
        /**
         * 由这个方法决定树的顶级显示那些对象。在此方法里生成了三个Country对象
         * @param inputElement  用tv.setInput()方法输入的那个对象，在这里没有使用这个对象
         */
        public Object[] getElements(Object inputElement) {
            String[] obj = new String[3];
            obj[0] = "中国";
            obj[1] = "美国";
            obj[2] = "英国";
            return obj;
        }