cdc.ui.swing.widgets.HtmlPanel Maven / Gradle / Ivy

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package cdc.ui.swing.widgets;

import java.awt.Desktop;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.io.File;
import java.io.IOException;
import java.net.MalformedURLException;
import java.net.URISyntaxException;
import java.net.URL;

import javax.swing.JEditorPane;
import javax.swing.JPanel;
import javax.swing.event.HyperlinkEvent;

import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;

import cdc.ui.swing.GridBagConstraintsBuilder;
import cdc.ui.swing.app.ExceptionDialog;

public class HtmlPanel extends JPanel {
    private static final long serialVersionUID = 1L;
    private static final Logger LOGGER = LogManager.getLogger(HtmlPanel.class);
    private final JEditorPane wPane = new JEditorPane();
    private final StringBuilder builder = new StringBuilder();

    public HtmlPanel() {
        setLayout(new GridBagLayout());
        add(wPane,
            GridBagConstraintsBuilder.builder()
                                     .gridx(0)
                                     .gridy(0)
                                     .weightx(1.0)
                                     .weighty(1.0)
                                     .fill(GridBagConstraints.BOTH)
                                     .build());

        wPane.setEditorKit(JEditorPane.createEditorKitForContentType("text/html"));
        wPane.setEditable(false);
        wPane.setText("TODO");

        wPane.addHyperlinkListener(event -> {
            if (event.getEventType() == HyperlinkEvent.EventType.ACTIVATED) {
                // Do something with e.getURL() here
                LOGGER.info("event: " + event.getURL());
                if (Desktop.isDesktopSupported()) {
                    try {
                        Desktop.getDesktop().browse(event.getURL().toURI());
                    } catch (IOException | URISyntaxException e) {
                        ExceptionDialog.showExceptionDialog(this, e, "Failed fo open '" + event.getURL() + "'", null);
                    }
                }
            }
        });
    }

    public HtmlPanel clear() {
        builder.setLength(0);
        builder.append("");
        return this;
    }

    public HtmlPanel append(String text) {
        builder.append(text);
        return this;
    }

    public HtmlPanel href(URL url,
                          String title) {
        return this.append("")
                   .append(title)
                   .append("");
    }

    public HtmlPanel href(File file,
                          String title) {
        try {
            return href(file.toURI().toURL(),
                        title);
        } catch (final MalformedURLException e) {
            throw new IllegalArgumentException(e);
        }
    }

    public HtmlPanel href(File file) {
        return href(file, file.getPath());
    }

    public void build() {
        builder.append("");
        wPane.setText(builder.toString());
    }
}