/*
* IzPack - Copyright 2001-2008 Julien Ponge, All Rights Reserved.
*
* http://izpack.org/
* http://izpack.codehaus.org/
*
* Copyright 2003 Tino Schwarze
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.izforge.izpack.util;
/**
* This interface describes basic functionality neccessary for user interaction.
* <p/>
* All methods or functions which perform work and need to notify or ask the user use a listener for
* such purposes. This way, we can separate UI from function.
*/
public interface AbstractUIHandler
{
/**
* Notify the user about something.
* <p/>
* The difference between notification and warning is that a notification should not need user
* interaction and can savely be ignored.
*
* @param message The notification.
*/
public void emitNotification(String message);
/**
* Warn the user about something.
*
* @param title The message title (used for dialog name, might not be displayed)
* @param message The warning message.
* @return true if the user decided not to continue
*/
public boolean emitWarning(String title, String message);
/**
* Notify the user of some error.
*
* @param title The message title (used for dialog name, might not be displayed)
* @param message The error message.
*/
public void emitError(String title, String message);
// constants for asking questions
// must all be >= 0!
public static final int ANSWER_CANCEL = 45;
public static final int ANSWER_YES = 47;
public static final int ANSWER_NO = 49;
// values for choices to present to the user
public static final int CHOICES_YES_NO = 37;
public static final int CHOICES_YES_NO_CANCEL = 38;
/**
* Ask the user a question.
*
* @param title The title of the question (useful for dialogs). Might be null.
* @param question The question.
* @param choices The set of choices to present. Either CHOICES_YES_NO or CHOICES_YES_NO_CANCEL
* @return The user's choice. (ANSWER_CANCEL, ANSWER_YES or ANSWER_NO)
*/
public int askQuestion(String title, String question, int choices);
/**
* Ask the user a question.
*
* @param title The title of the question (useful for dialogs). Might be null.
* @param question The question.
* @param choices The set of choices to present. Either CHOICES_YES_NO or CHOICES_YES_NO_CANCEL
* @param default_choice The default choice. One of ANSWER_CANCEL, ANSWER_YES or ANSWER_NO.
* @return The user's choice. (ANSWER_CANCEL, ANSWER_YES or ANSWER_NO)
*/
public int askQuestion(String title, String question, int choices, int default_choice);
}