combo2.java

eclipse 从入门到精通的源码,有了这个如果学会的话,可以毫无质疑的说我会SWT编程.包括:thread,button,canvas,combol,filllayout,griddata,prog

/**
 * 作者：刘 金鑫
 * Email：[e-mail]
 */
package swt;

import org.eclipse.jface.dialogs.MessageDialog;
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.SelectionAdapter;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Combo;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;

public class Combo1 {
    public static void main(String[] args) {
        final Display display = Display.getDefault();
        final Shell shell = new Shell();
        shell.setSize(327, 253);
        shell.setText("SWT Application");
        //------------------新插入的界面核心代码------------------------

        final Combo combo = new Combo(shell, SWT.READ_ONLY); //定义一个只读的下拉框
        combo.setBounds(16, 11, 100, 25);
        //设值按钮
        final Button button1 = new Button(shell, SWT.NONE);
        button1.setBounds(17, 65, 100, 25);
        button1.setText("设值");
        button1.addSelectionListener(new SelectionAdapter() {
            public void widgetSelected(SelectionEvent e) {
                combo.removeAll(); //先清空combo，以防"设值"按钮多次按下时出BUG
                for (int i = 1; i <= 10; i++){
                    //循环，赋值
                    combo.add("第" + i + "个字符串"); //在combo中显示的字符串
		    combo.setData("" + (i - 1),new Integer(i));
		}
                combo.select(0); //设置第一项为当前项
            }
        });

        //取值按钮
        final Button button2 = new Button(shell, SWT.NONE);
        button2.setBounds(136, 66, 100, 25);
        button2.setText("取值");
        button2.addSelectionListener(new SelectionAdapter() {
            public void widgetSelected(SelectionEvent e) {
		//根据SelectionIndex值转化成字符串后得到对应的key
		String key = "" + combo.getSelectionIndex();
		//根据key值得到Object(对象)，注意还要用(Integer)进行类型转换
		Integer selectionObj = (Integer)combo.getData(key);
                // combo.getText()得到combo中当前显示的字符串
                MessageDialog.openInformation(shell, null, "选择的Integer对象的值是" ＋selectObj.toString());
            }
        });

        //------------------END---------------------------------------------
        shell.layout();
        shell.open();
        while (!shell.isDisposed()) {
            if (!display.readAndDispatch())
                display.sleep();
        }
    }
}