SimpleBrowser.java

/*
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 * and open the template in the editor.
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/*
 * SimpleBrowser.java
 *
 * Created on Apr 11, 2012, 2:00:21 PM
 */
package org.pepsoft.worldpainter.browser;

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.IOException;
import java.net.URL;
import java.util.ArrayList;
import java.util.List;
import javax.swing.AbstractAction;
import javax.swing.Action;
import javax.swing.JOptionPane;
import javax.swing.event.HyperlinkEvent;
import javax.swing.event.HyperlinkEvent.EventType;
import javax.swing.event.HyperlinkListener;
import javax.swing.text.html.HTMLEditorKit;
import org.pepsoft.util.IconUtils;

/**
 *
 * @author pepijn
 */
public class SimpleBrowser extends javax.swing.JDialog implements HyperlinkListener {
    /** Creates new form SimpleBrowser */
    public SimpleBrowser(java.awt.Frame parent, boolean modal, String title, String initialUrl) {
        super(parent, modal);
        initComponents();
        setTitle(title);
        HTMLEditorKit htmlEditorKit = new HTMLEditorKit();
        jEditorPane1.setEditorKit(htmlEditorKit);
        try {
            jEditorPane1.setPage(initialUrl);
        } catch (IOException e) {
            throw new RuntimeException("I/O error loading page", e);
        }
        jEditorPane1.addHyperlinkListener(this);
        history.add(initialUrl);
        historySize = 1;
        historyPointer = 0;
        setLocationRelativeTo(parent);
    }

    public Action getBackAction() {
        return backAction;
    }

    public Action getForwardAction() {
        return forwardAction;
    }

    public ActionListener getActionListener() {
        return actionListener;
    }

    public void setActionListener(ActionListener actionListener) {
        this.actionListener = actionListener;
    }

    // HyperlinkListener
    
    @Override
    public void hyperlinkUpdate(HyperlinkEvent e) {
        if ((e.getEventType() == EventType.ACTIVATED) && (e.getURL().getProtocol().equals("action")) && (actionListener != null)) {
            ActionEvent event = new ActionEvent(this, ActionEvent.ACTION_PERFORMED, e.getURL().getFile());
            actionListener.actionPerformed(event);
        }
    }

    /** This method is called from within the constructor to
     * initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is
     * always regenerated by the Form Editor.
     */
    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">//GEN-BEGIN:initComponents
    private void initComponents() {

        jScrollPane1 = new javax.swing.JScrollPane();
        jEditorPane1 = new javax.swing.JEditorPane();

        setDefaultCloseOperation(javax.swing.WindowConstants.DISPOSE_ON_CLOSE);
        setTitle("Simple Browser");

        jEditorPane1.setEditable(false);
        jEditorPane1.setFont(new java.awt.Font("Dialog", 0, 15)); // NOI18N
        jEditorPane1.addHyperlinkListener(this::jEditorPane1HyperlinkUpdate);
        jScrollPane1.setViewportView(jEditorPane1);

        getContentPane().add(jScrollPane1, java.awt.BorderLayout.CENTER);

        java.awt.Dimension screenSize = java.awt.Toolkit.getDefaultToolkit().getScreenSize();
        setBounds((screenSize.width-800)/2, (screenSize.height-600)/2, 800, 600);
    }// </editor-fold>//GEN-END:initComponents

    private void jEditorPane1HyperlinkUpdate(javax.swing.event.HyperlinkEvent evt) {//GEN-FIRST:event_jEditorPane1HyperlinkUpdate
        if (evt.getEventType() == EventType.ACTIVATED) {
            URL url = evt.getURL();
            try {
                jEditorPane1.setPage(url);
                if (historyPointer == (historySize - 1)) {
                    // At the end of the history
                    history.add(url.toExternalForm());
                    historyPointer++;
                    historySize++;
                } else {
                    // Not at the end of the history; erase the tail end
                    historyPointer++;
                    history.set(historyPointer, url.toExternalForm());
                    historySize = historyPointer + 1;
                }
                backAction.setEnabled(true);
                forwardAction.setEnabled(false);
            } catch (IOException e) {
                JOptionPane.showMessageDialog(this, "I/O error loading page " + url, "Error Loading Page", JOptionPane.ERROR_MESSAGE);
            }
        }
    }//GEN-LAST:event_jEditorPane1HyperlinkUpdate

    private final Action backAction = new AbstractAction("back", IconUtils.loadScaledIcon("org/pepsoft/worldpainter/icons/resultset_previous.png")) {
        {
            setEnabled(false);
        }
        
        @Override
        public void actionPerformed(ActionEvent event) {
            if (historyPointer > 0) {
                historyPointer--;
                String url = history.get(historyPointer);
                try {
                    jEditorPane1.setPage(url);
                    if (historyPointer == 0) {
                        setEnabled(false);
                    }
                    forwardAction.setEnabled(true);
                } catch (IOException e) {
                    JOptionPane.showMessageDialog(SimpleBrowser.this, "I/O error loading page " + url, "Error Loading Page", JOptionPane.ERROR_MESSAGE);
                }
            }
        }
        
        private static final long serialVersionUID = 1L;
    };
    
    private final Action forwardAction = new AbstractAction("forward", IconUtils.loadScaledIcon("org/pepsoft/worldpainter/icons/resultset_next.png")) {
        {
            setEnabled(false);
        }
        
        @Override
        public void actionPerformed(ActionEvent event) {
            if (historyPointer < (historySize - 1)) {
                historyPointer++;
                String url = history.get(historyPointer);
                try {
                    jEditorPane1.setPage(url);
                    if (historyPointer == (historySize - 1)) {
                        setEnabled(false);
                    }
                    backAction.setEnabled(true);
                } catch (IOException e) {
                    JOptionPane.showMessageDialog(SimpleBrowser.this, "I/O error loading page " + url, "Error Loading Page", JOptionPane.ERROR_MESSAGE);
                }
            }
        }
        
        private static final long serialVersionUID = 1L;
    };
    
    // Variables declaration - do not modify//GEN-BEGIN:variables
    private javax.swing.JEditorPane jEditorPane1;
    private javax.swing.JScrollPane jScrollPane1;
    // End of variables declaration//GEN-END:variables

    private final List<String> history = new ArrayList<>();
    private int historySize, historyPointer;
    private ActionListener actionListener;
    
    private static final long serialVersionUID = 1L;
}