com.google.gwt.gadgets.sample.traveler.client.ErrorNotifier.java Source code

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Here is the source code for com.google.gwt.gadgets.sample.traveler.client.ErrorNotifier.java

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/*
 * Copyright 2010 Google Inc.
 *
 * 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.google.gwt.gadgets.sample.traveler.client;

import com.google.gwt.event.dom.client.ClickEvent;
import com.google.gwt.event.dom.client.ClickHandler;
import com.google.gwt.user.client.ui.Button;
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.HasHorizontalAlignment;
import com.google.gwt.user.client.ui.Label;
import com.google.gwt.user.client.ui.VerticalPanel;

/**
 * Component responsible for displaying errors.
 */
public class ErrorNotifier {

    private static ErrorNotifier errorNotifier;

    public static ErrorNotifier getErrorNotifier() {
        if (errorNotifier == null) {
            errorNotifier = new ErrorNotifier();
        }
        return errorNotifier;
    }

    private DialogBox dialogBox;
    private Label codeLabel;
    private HTML detailsHTML;
    private Button detailsButton;

    private ErrorNotifier() {
        dialogBox = new DialogBox();
        dialogBox.setText("Error occurred");
        dialogBox.setAnimationEnabled(true);

        codeLabel = new Label();
        detailsHTML = new HTML();
        detailsHTML.setVisible(false);
        detailsButton = new Button("Show details");
        detailsButton.addClickHandler(new ClickHandler() {
            public void onClick(ClickEvent event) {
                toggleDetails();
            }
        });
        final Button closeButton = new Button("Close");
        closeButton.addClickHandler(new ClickHandler() {
            public void onClick(ClickEvent event) {
                dialogBox.hide();
            }
        });

        VerticalPanel dialogVPanel = new VerticalPanel();
        dialogVPanel.setStylePrimaryName("error-panel");
        dialogVPanel.setHorizontalAlignment(HasHorizontalAlignment.ALIGN_CENTER);
        dialogVPanel.add(codeLabel);

        dialogVPanel.add(detailsHTML);
        FlowPanel buttons = new FlowPanel();
        buttons.add(detailsButton);
        buttons.add(closeButton);
        dialogVPanel.add(buttons);
        dialogBox.setWidget(dialogVPanel);
    }

    public void showError(int code, String details) {
        codeLabel.setText("Error code: " + code);
        detailsHTML.setHTML(details);
        if (detailsHTML.isVisible()) {
            toggleDetails();
        }
        dialogBox.center();
    }

    private void toggleDetails() {
        detailsHTML.setVisible(!detailsHTML.isVisible());
        if (detailsHTML.isVisible()) {
            detailsButton.setText("Hide details");
        } else {
            detailsButton.setText("Show details");
        }
        dialogBox.center();
    }
}