loginform.java

来自「SWT Example : Shows how to create button」· Java 代码 · 共 74 行

import org.eclipse.swt.SWT;
import org.eclipse.swt.layout.*;
import org.eclipse.swt.widgets.*;
import org.eclipse.swt.events.*;

public class LoginForm {
  Display display = new Display();
  Shell shell = new Shell(display);
  Label label1,label2;
  Text username;
  Text password;
  Text text;
 
    public LoginForm() {
    shell.setLayout(new GridLayout(2, false));
	shell.setText("Login form");
    label1=new Label(shell, SWT.NULL);
	label1.setText("User Name: ");
    
    username = new Text(shell, SWT.SINGLE | SWT.BORDER);
    username.setText("");
    username.setTextLimit(30);
    
    label2=new Label(shell, SWT.NULL);
	label2.setText("Password: ");
    
    password = new Text(shell, SWT.SINGLE | SWT.BORDER);
    System.out.println(password.getEchoChar());
    password.setEchoChar('*');
    password.setTextLimit(30);

    Button button=new Button(shell,SWT.PUSH);
	button.setText("Submit");
	button.addListener(SWT.Selection, new Listener() {
      public void handleEvent(Event event) {
		  String selected=username.getText();
          String selected1=password.getText();
		  
		if(selected==""){ 
			MessageBox messageBox = new MessageBox(shell, SWT.OK |SWT.ICON_WARNING |SWT.CANCEL);
			messageBox.setMessage("Enter the User Name");
			 messageBox.open();
		}
		if(selected1==""){
             MessageBox messageBox = new MessageBox(shell, SWT.OK |SWT.ICON_WARNING |SWT.CANCEL);
			messageBox.setMessage("Enter the Password");
			 messageBox.open();
		}
		else{
		MessageBox messageBox = new MessageBox(shell, SWT.OK | SWT.CANCEL);
        messageBox.setText("Login Form");
		messageBox.setMessage("Welcome:" + username.getText());
        messageBox.open();
		}
		}
	});
    username.setLayoutData(new GridData(GridData.FILL_HORIZONTAL));
    password.setLayoutData(new GridData(GridData.FILL_HORIZONTAL));
    
    shell.pack();
    shell.open();
    
    while (!shell.isDisposed()) {
      if (!display.readAndDispatch()) {
        display.sleep();
      }
    }
   display.dispose();
	}
   public static void main(String[] args) {
   new LoginForm();
  }
}