promptdialog.java

来自「J2ME MIDP_Example_Applications」· Java 代码 · 共 143 行

// Copyright 2003 Nokia Corporation.
//
// THIS SOURCE CODE IS PROVIDED 'AS IS', WITH NO WARRANTIES WHATSOEVER,
// EXPRESS OR IMPLIED, INCLUDING ANY WARRANTY OF MERCHANTABILITY, FITNESS
// FOR ANY PARTICULAR PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE
// OR TRADE PRACTICE, RELATING TO THE SOURCE CODE OR ANY WARRANTY OTHERWISE
// ARISING OUT OF ANY PROPOSAL, SPECIFICATION, OR SAMPLE AND WITH NO
// OBLIGATION OF NOKIA TO PROVIDE THE LICENSEE WITH ANY MAINTENANCE OR
// SUPPORT. FURTHERMORE, NOKIA MAKES NO WARRANTY THAT EXERCISE OF THE
// RIGHTS GRANTED HEREUNDER DOES NOT INFRINGE OR MAY NOT CAUSE INFRINGEMENT
// OF ANY PATENT OR OTHER INTELLECTUAL PROPERTY RIGHTS OWNED OR CONTROLLED
// BY THIRD PARTIES
//
// Furthermore, information provided in this source code is preliminary,
// and may be changed substantially prior to final release. Nokia Corporation
// retains the right to make changes to this source code at
// any time, without notice. This source code is provided for informational
// purposes only.
//
// Nokia and Nokia Connecting People are registered trademarks of Nokia
// Corporation.
// Java and all Java-based marks are trademarks or registered trademarks of
// Sun Microsystems, Inc.
// Other product and company names mentioned herein may be trademarks or
// trade names of their respective owners.
//
// A non-exclusive, non-transferable, worldwide, limited license is hereby
// granted to the Licensee to download, print, reproduce and modify the
// source code. The licensee has the right to market, sell, distribute and
// make available the source code in original or modified form only when
// incorporated into the programs developed by the Licensee. No other
// license, express or implied, by estoppel or otherwise, to any other
// intellectual property rights is granted herein.
package example.mesql;

import javax.microedition.lcdui.*;

class PromptDialog
   extends Form
   implements CommandListener
{
  private final TextField userField;
  private final TextField passwordField;
  private final Command okCommand;
  private final Command cancelCommand;
  private final Display display;
  private Displayable previousDisplayable;
  private transient boolean wasCancelled;


  PromptDialog(Display display, String realm)
  {
    super(realm);
    this.display = display;

    userField = new TextField("User:", "", 16, TextField.ANY);
    passwordField = new TextField("Password:", "", 16, TextField.PASSWORD);
    
    okCommand = new Command("OK", Command.OK, 2);
    cancelCommand = new Command("Cancel", Command.CANCEL, 2);
    
    append(userField);
    append(passwordField);
    
    addCommand(okCommand);
    addCommand(cancelCommand);

    setCommandListener(this);
  }


  public void promptForInput()
  {
    // Warning: if previousDisplayable is an Alert, we'll fail when
    // we try to restore it.
    previousDisplayable = display.getCurrent();
    display.setCurrent(this);

    synchronized (this)
    {
      try
      {
        wait();
        // make caller wait on our monitor
      }
      catch (InterruptedException e)
      {
        // never thrown in MIDP

      }
    }
  }


  public void commandAction(Command c, Displayable d)
  {
    if (c == okCommand)
    {
      wasCancelled = false;
      display.setCurrent(previousDisplayable);
      synchronized (this)
      {
        notify();
        // wake up caller
      }
    }
    else if (c == cancelCommand)
    {
      wasCancelled = true;
      display.setCurrent(previousDisplayable);
      synchronized (this)
      {
        notify();
        // wake up caller
      }
    }
  }


  String getUsername()
  {
    String username = null;
    if (!wasCancelled)
    {
      username = userField.getString();
    }
    return username;
  }


  String getPassword()
  {
    String password = null;
    if (!wasCancelled)
    {
      password = passwordField.getString();
    }
    return password;
  }

}