userinfopage.java

学生成绩管理系统 eclipse rcp开发 swt技术

package com.zdh.sms.editor.wizard;

import org.eclipse.jface.dialogs.IMessageProvider;
import org.eclipse.jface.dialogs.MessageDialog;
import org.eclipse.jface.wizard.WizardPage;
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.ModifyEvent;
import org.eclipse.swt.events.ModifyListener;
import org.eclipse.swt.events.SelectionAdapter;
import org.eclipse.swt.events.SelectionEvent;
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.Label;
import org.eclipse.swt.widgets.Text;

import com.zdh.sms.model.IUser;
import com.zdh.sms.system.SmsFactory;


//本类实现了ModifyListener接口，将自己变成了一个文本框改变事件的监听器
public class UserInfoPage extends WizardPage implements ModifyListener {
	private Text useridText; // 用户名

	private Text passwordText; // 密码

	private Text nameText; // 姓名

	protected UserInfoPage(String pageName) {
		super(pageName);
	}

	public void createControl(Composite parent) {
		setTitle("添加用户");
		setMessage("输入用户基本信息", IMessageProvider.INFORMATION);
		Composite topComp = new Composite(parent, SWT.NONE);
		topComp.setLayoutData(new GridData(GridData.CENTER, GridData.CENTER,
				true, true));
		// 创建界面组件
		topComp.setLayout(new GridLayout(3, false));// 网格布局，3列
		new Label(topComp, SWT.NONE).setText("用户名：");
		useridText = createText(topComp, SWT.BORDER);
		useridText.addModifyListener(this);
		Button checkButton = new Button(topComp, SWT.NONE);
		checkButton.setText("检查惟一性");
		checkButton.addSelectionListener(new SelectionAdapter() {
			public void widgetSelected(SelectionEvent e) {
				String userid = useridText.getText();
				if (!userid.trim().equals("")) {// 文本框传出值不必作null值判断
					if (SmsFactory.getDbOperate().getUser(userid) == null) {
						MessageDialog.openInformation(null, "", "通过");
					} else {
						MessageDialog.openError(null, "", "此用户名已经存在");
						useridText.forceFocus();// 获得焦点
						useridText.selectAll();// 全选
					}
				}
			}
		});

		new Label(topComp, SWT.NONE).setText("密码：");
		passwordText = createText(topComp, SWT.BORDER);
		passwordText.addModifyListener(this);
		new Label(topComp, SWT.NONE);

		new Label(topComp, SWT.NONE).setText("姓名：");
		nameText = createText(topComp, SWT.BORDER);
		new Label(topComp, SWT.NONE);
		nameText.addModifyListener(this);

		setPageComplete(false);
		setControl(topComp);
	}

	// 得到一个固定长度的Text框
	private Text createText(Composite comp, int style) {
		Text text = new Text(comp, style);
		text.setLayoutData(new GridData(100, -1));
		return text;
	}

	// 文本修改事件——当文本被修改时触发
	public void modifyText(ModifyEvent e) {
		setPageComplete(false);
		if (useridText.getText().trim().equals("")) {
			setErrorMessage("必须填写用户名");// 提示错误信息
			return;
		}
		if (passwordText.getText().trim().equals("")) {
			setErrorMessage("必须填写密码");// 提示错误信息
			return;
		}
		if (nameText.getText().trim().equals("")) {
			setErrorMessage("必须填写姓名");// 提示错误信息
			return;
		}
		setErrorMessage(null); // 消除对话框上的出错提示文字
		setPageComplete(true);
	}

	// 将界面值注入到Teacher对象中
	public void getValue(IUser user) {
		user.setUserId(useridText.getText());
		user.setPassword(passwordText.getText());
		user.setName(nameText.getText());
	}
}