com.google.speedtracer.latencydashboard.client.WarningPane.java Source code

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Here is the source code for com.google.speedtracer.latencydashboard.client.WarningPane.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.speedtracer.latencydashboard.client;

import com.google.gwt.event.dom.client.ClickEvent;
import com.google.gwt.event.dom.client.ClickHandler;
import com.google.gwt.resources.client.ClientBundle;
import com.google.gwt.resources.client.CssResource;
import com.google.gwt.user.client.ui.DockPanel;
import com.google.gwt.user.client.ui.Label;
import com.google.gwt.user.client.ui.RootPanel;

/**
 * Flashes an error at the top of the screen, then transitions itself away if
 * you click the 'x' button.
 */
public class WarningPane {

    /**
     * Css definitions for this UI component.
     */
    public interface Css extends CssResource {
        String warningCloseIcon();

        String warningPaneInner();

        String warningPaneOuter();

        String warningPaneText();
    }

    /**
     * ClientBundle definitions for this UI component.
     */
    public interface Resources extends ClientBundle {
        @Source("resources/WarningPane.css")
        Css warningPaneCss();
    }

    public static WarningPane singleton;

    public static WarningPane get() {
        return singleton;
    }

    public static void init(Resources resources) {
        if (singleton == null) {
            singleton = new WarningPane(resources);
        }
    }

    private final Label closeIconElement;
    private final DockPanel outerElement;
    private final Label textElement;

    private WarningPane(Resources resources) {
        this.outerElement = new DockPanel();
        this.textElement = new Label();
        this.closeIconElement = new Label();

        createUi(resources);
        RootPanel.get().add(outerElement);
    }

    public void hide() {
        outerElement.setVisible(false);
    }

    public void show(String message) {
        textElement.setText(message);
        outerElement.setVisible(true);
    }

    private void createUi(Resources resources) {
        Css css = resources.warningPaneCss();
        outerElement.addStyleName(css.warningPaneOuter());
        outerElement.setVisible(false);

        DockPanel innerElement = new DockPanel();
        innerElement.addStyleName(css.warningPaneInner());
        outerElement.add(innerElement, DockPanel.NORTH);

        textElement.addStyleName(css.warningPaneText());
        innerElement.add(textElement, DockPanel.CENTER);

        // Create the close icon
        closeIconElement.setStyleName(css.warningCloseIcon());
        closeIconElement.setText("x");
        closeIconElement.addClickHandler(new ClickHandler() {
            public void onClick(ClickEvent event) {
                hide();
            }
        });
        innerElement.add(closeIconElement, DockPanel.EAST);
    }
}