com.google.appinventor.client.utils.MessageDialog.java Source code

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Here is the source code for com.google.appinventor.client.utils.MessageDialog.java

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// -*- mode: java; c-basic-offset: 2; -*-
// Copyright 2017 MIT, All rights reserved
// Released under the Apache License, Version 2.0
// http://www.apache.org/licenses/LICENSE-2.0

package com.google.appinventor.client.utils;

import com.google.appinventor.client.widgets.boxes.Box;

import com.google.gwt.user.client.ui.Button;
import com.google.gwt.user.client.ui.ClickListener;
import com.google.gwt.user.client.ui.DialogBox;
import com.google.gwt.user.client.ui.FlowPanel;
import com.google.gwt.user.client.ui.HTML;
import com.google.gwt.user.client.ui.VerticalPanel;
import com.google.gwt.user.client.ui.Widget;

/**
 * A Utility for Dialog Boxes
 *
 * Put up a Dialog Box in the middle of the screen. It must have an
 * "OK" button and can optionally have a "Cancel" button. Also takes
 * an object to call on OK or Cancel after the OK or Cancel button is
 * pressed. This dialog is modal, locking out other activity.
 *
 * @author jis@mit.edu (Jeffrey I. Schiller)
 */

public class MessageDialog {
    public interface Actions {
        /**
         * Action to perform when OK button is pressed.
         * Note: the dialog box itself is already dismissed
         */
        public void onOK();

        /**
         * Action to peform when the Cancel button is pressed.
         * Note: the dialog box itself is already dismissed
         */
        public void onCancel();
    }

    private MessageDialog() {
    }

    /**
     * Put up a modal dialog box.
     *
     * @param title Title for the dialog, already internationalized
     * @param message Message box content, already internationalized
     * @param OK String for OK button, already internationalized
     * @param Cancel String for Cancel button, null if non, internationalized
     * @param actions Actions object to call upon completion, can be null
     */
    public static void messageDialog(String title, String message, String OK, String Cancel,
            final Actions actions) {
        final DialogBox dialogBox = new DialogBox(false, true); // DialogBox(autohide, modal)
        dialogBox.setStylePrimaryName("ode-DialogBox");
        dialogBox.setText(title);
        dialogBox.setHeight("100px");
        dialogBox.setWidth("400px");
        dialogBox.setGlassEnabled(true);
        dialogBox.setAnimationEnabled(true);
        dialogBox.center();
        VerticalPanel DialogBoxContents = new VerticalPanel();
        HTML messageHtml = new HTML("<p>" + message + "</p>");
        messageHtml.setStyleName("DialogBox-message");
        FlowPanel holder = new FlowPanel();
        Button okButton = new Button(OK);
        okButton.addClickListener(new ClickListener() {
            public void onClick(Widget sender) {
                dialogBox.hide();
                if (actions != null)
                    actions.onOK();
            }
        });
        holder.add(okButton);
        if (Cancel != null) {
            Button cancelButton = new Button(Cancel);
            cancelButton.addClickListener(new ClickListener() {
                @Override
                public void onClick(Widget sender) {
                    dialogBox.hide();
                    if (actions != null)
                        actions.onCancel();
                }
            });
            holder.add(cancelButton);
        }
        DialogBoxContents.add(messageHtml);
        DialogBoxContents.add(holder);
        dialogBox.setWidget(DialogBoxContents);
        dialogBox.show();
    }
}