text1.java

Eclipse从入门到精通源代码/第二篇 SWT_JFace篇(6-16章)

/**
 * @作者：陈刚
 * @Email：[e-mail]
 * @Blog：http://blog.csdn.net/glchengang
 */
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.events.VerifyEvent;
import org.eclipse.swt.events.VerifyListener;
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 Text1 {
    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 Text text = new Text(shell, SWT.BORDER); //定义一个文本框
        text.setBounds(18, 20, 153, 25); //文本框的定位
        text.setTextLimit(10); //最多只能输入10个字符
        //检验监听器，每键入一个字符前都会触发
        text.addVerifyListener(new VerifyListener() {
            public void verifyText(VerifyEvent e) {
                //检查输入的字符(e.text)是否在0123456789这个字符串中，不在indexOf会返回-1
                boolean b = ("0123456789".indexOf(e.text) >= 0);
                e.doit = b; //doit属性如果为true，则字符允许输入。反之不允许
            }
        });

        final Button button = new Button(shell, SWT.NONE); //定义一个"确定"按钮
        button.setText("确定");
        button.addSelectionListener(new SelectionAdapter() {
            public void widgetSelected(SelectionEvent e) { //按钮的单击事件
                //如果文本框没有输入，则出一个警告窗，否则出一个信息提示窗
                String str = text.getText();
                if (str == null || str.equals(""))
                    MessageDialog.openWarning(shell, "", "请输入一个字符");
                else
                    MessageDialog.openInformation(shell, "", "输入值通过检证");
            }
        });

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