loginwidget.java.svn-base

利用google开发的GWT工具

package org.gjj.gwt.client;

import java.util.List;

import com.google.gwt.core.client.GWT;
import com.google.gwt.user.client.Window;
import com.google.gwt.user.client.rpc.AsyncCallback;
import com.google.gwt.user.client.rpc.ServiceDefTarget;
import com.google.gwt.user.client.ui.Button;
import com.google.gwt.user.client.ui.ClickListener;
import com.google.gwt.user.client.ui.Composite;
import com.google.gwt.user.client.ui.DecoratorPanel;
import com.google.gwt.user.client.ui.DockPanel;
import com.google.gwt.user.client.ui.Grid;
import com.google.gwt.user.client.ui.HTML;
import com.google.gwt.user.client.ui.HasHorizontalAlignment;
import com.google.gwt.user.client.ui.HorizontalPanel;
import com.google.gwt.user.client.ui.KeyboardListenerAdapter;
import com.google.gwt.user.client.ui.PasswordTextBox;
import com.google.gwt.user.client.ui.TextBox;
import com.google.gwt.user.client.ui.Widget;

public class LoginWidget extends Composite implements ClickListener{

    PasswordTextBox pw = new PasswordTextBox();
    TextBox usrName = new TextBox();
    MainControlPanel mcPanel = new MainControlPanel();
    LoginSystemAsync loginService;

   // DockPanel mainDockP = new DockPanel();
    DecoratorPanel mainDockP = new DecoratorPanel();
    Button login;
    Button clear;
    /**
     * constructor
     */
    public LoginWidget(){
    	/*Main Dock Panel*/
//    	mainDockP.setBorderWidth(1);
//    	mainDockP.setSpacing(5);
//    	mainDockP.setStylePrimaryName("dock");
    	initRPC();
    	//mainDockP.add(buildLoginPanel(), DockPanel.CENTER);
    	mainDockP.setWidget(buildLoginPanel());
    	//init widget
    	initWidget(mainDockP);
    }
    
	/**
	   * @author gaojinjun
	   * @return DockPanel
	   */
	  public DockPanel buildLoginPanel(){
		  
		  DockPanel usrPanel = new DockPanel();
		  /*USR Panel*/
		  usrPanel.setStylePrimaryName("usrhorizontalpanel");
		  usrPanel.setSpacing(10);
		  
		  HorizontalPanel head = new HorizontalPanel();
		  head.setSpacing(5);
		  
		  head.add(new HTML("<h2 align=center>登录页</h2>"));
		  //head.add(new HTML("<h2 align=center>HLA Cluster Manager</h2>"));
		  
		  usrPanel.add(head, DockPanel.NORTH);
		  /*
		   * Add username and password text  box
		   */
		  Grid namePw = new Grid(2,3);
		  namePw.setText(0, 0, "用户名:");
		  namePw.setWidget(0, 1, usrName);
		  namePw.setText(1, 0, "密码:");
		  namePw.setWidget(1, 1, pw);
		  usrPanel.add(namePw,DockPanel.CENTER);
		  /*
		   * Add login and clear button
		   */
		  HorizontalPanel bnPanel = new HorizontalPanel();
		  bnPanel.setSpacing(5);
		  bnPanel.setHorizontalAlignment(HasHorizontalAlignment.ALIGN_CENTER);
		  login = new Button("登录",new ClickListener(){
			  public void onClick(Widget sender){
				  isAccountValid();
			  }
		  });
		  clear = new Button("清空",new ClickListener(){
			  public void onClick(Widget sender){
				  usrName.setText("");
				  pw.setText("");
			  }
		  });
		  
		//init pw and usrName's click
		  usrName.addKeyboardListener(new KeyboardListenerAdapter() {
			  public void onKeyPress(Widget sender, char keyCode, int modifier){
				  if(keyCode == '\r'){
					  login.click();
				  }
			  }
		  });
	    pw.addKeyboardListener(new KeyboardListenerAdapter() {
	    	public void onKeyPress(Widget sender, char keyCode, int modifiers){
	    		if (keyCode == '\r'){
	    			login.click();	
	    		}
	    	}
	    });
		  bnPanel.add(login);
		  bnPanel.add(clear);
		  bnPanel.setCellHorizontalAlignment(login, HasHorizontalAlignment.ALIGN_LEFT);
		  bnPanel.setCellHorizontalAlignment(clear, HasHorizontalAlignment.ALIGN_RIGHT);
		  usrPanel.add(bnPanel, DockPanel.SOUTH);
		  
		  return usrPanel;
	  }
	  
	  /**
	   * @author gaojinjun
	   * @param null
	   * initial async rpc
	   */
	  public void initRPC(){
		// get a handle on the async version of our service
		  loginService = (LoginSystemAsync)GWT.create(LoginSystem.class);
		  ServiceDefTarget endpoint = (ServiceDefTarget)loginService;
		  String moduleRelativeURL = GWT.getModuleBaseURL() + "LoginSystem";
		  endpoint.setServiceEntryPoint(moduleRelativeURL);
	  }
	  
	  /**
	   * @author gaojinjun
	   * @return boolean
	   */
	  public void isAccountValid(){
		// create the response handler
		  final AsyncCallback callback = new AsyncCallback(){
			  public void onFailure(Throwable caught) {
				  System.out.println("error!");
				  Window.alert("Sorry there was an error");
			  }
			  public void onSuccess(Object result) {
				 boolean flag = result.toString() == "true";
				 //flag = true;
				 if(!flag)
					  Window.alert("用户不存在或密码错误！");
				  else {
					  //login
					 mainDockP.clear();
					 mainDockP.add(mcPanel.buildMainControl());
					  
				  }
			  }
		  };
		  loginService.isValid(usrName.getText(),pw.getText(),callback);
	  }

	public void onClick(Widget sender){
		
	}
}