com.youtube.statistics.client.ResultsPanel.java Source code

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Here is the source code for com.youtube.statistics.client.ResultsPanel.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.youtube.statistics.client;

import com.google.gwt.user.client.ui.FlowPanel;
import com.google.gwt.user.client.ui.HTML;
import com.google.gwt.user.client.ui.Image;
import com.google.gwt.user.client.ui.Label;
import com.google.gwt.user.client.ui.Panel;
import com.google.gwt.user.client.ui.RootPanel;
import com.google.gwt.visualization.client.visualizations.Visualization;

/**
 * A panel to show the results of the RPC requst, or the progress indicator or
 * error message as appropriate.
 *
 * @author martinstrauss@google.com (Martin Strauss)
 */
public class ResultsPanel {
    /** The title for the error message when the server returns an error. */
    private static final String MSG_RPC_FAILURE = "Remote Procedure Call - Failure";
    /** The prefix for all error messages. */
    private static final String MSG_ERROR = "Error";
    /** Displayed when the server cannot be reached or returns an error. */
    private static final String MSG_SERVER_ERROR = "An error occurred while "
            + "attempting to contact the server. Please check your network " + "connection and try again.";

    private static final String PROGRESS_SPINNER_STYLE = "progressSpinner";

    private static final String SERVER_RESPONSE_LABEL_ERROR_ID = "serverResponseLabelError";

    private static final String PROGRESS_SPINNER_IMAGE = "spin.gif";

    private final RootPanel panel;

    public ResultsPanel(String domId) {
        panel = RootPanel.get(domId);
    }

    public void drawProgressIndicator() {
        panel.clear();
        Image progress = new Image(PROGRESS_SPINNER_IMAGE);
        progress.addStyleName(PROGRESS_SPINNER_STYLE);
        panel.add(progress);
    }

    public void drawError(String error) {
        panel.clear();
        panel.add(new Label(MSG_ERROR));
        final Label serverResponseLabel = new Label();
        panel.add(serverResponseLabel);
        serverResponseLabel.addStyleName(SERVER_RESPONSE_LABEL_ERROR_ID);
        serverResponseLabel.setText(error);
    }

    public void drawRpcError() {
        panel.clear();
        panel.add(new Label(MSG_RPC_FAILURE));
        final HTML serverResponseLabel = new HTML();
        panel.add(serverResponseLabel);
        serverResponseLabel.addStyleName(SERVER_RESPONSE_LABEL_ERROR_ID);
        serverResponseLabel.setHTML(MSG_SERVER_ERROR);
    }

    public void addVisualization(Visualization<?> chart) {
        panel.add(chart);
    }

    public void addVisualization(Label title, Visualization<?> chart) {
        Panel visualizationPanel = new FlowPanel();
        visualizationPanel.addStyleName("visualizationPanel");
        visualizationPanel.add(title);
        visualizationPanel.add(chart);
        panel.add(visualizationPanel);
    }

    public void clear() {
        panel.clear();
    }
}