Added instructions.

src/main/java/nl/andrewlalis/erme/control/actions/AboutAction.java

@@ -0,0 +1,36 @@
+package nl.andrewlalis.erme.control.actions;
+
+import nl.andrewlalis.erme.EntityRelationMappingEditor;
+
+import javax.swing.*;
+import java.awt.*;
+import java.awt.event.ActionEvent;
+
+public class AboutAction extends AbstractAction {
+	private static AboutAction instance;
+
+	public static AboutAction getInstance() {
+		if (instance == null) instance = new AboutAction();
+		return instance;
+	}
+
+	public AboutAction() {
+		super("About");
+		this.putValue(SHORT_DESCRIPTION, "Show some information about this program.");
+	}
+
+	@Override
+	public void actionPerformed(ActionEvent e) {
+		JOptionPane.showMessageDialog(
+				(Component) e.getSource(),
+				"Entity-Relation Mapping Editor\n" +
+						"by Andrew Lalis\n" +
+						"Version " + EntityRelationMappingEditor.VERSION + "\n" +
+						"To report bugs or make suggestions, please visit the GitHub\n" +
+						"repository for this application and create a new issue.\n\n" +
+						"Thank you for using the ERME!",
+				"About ERME",
+				JOptionPane.INFORMATION_MESSAGE
+		);
+	}
+}

src/main/java/nl/andrewlalis/erme/control/actions/InstructionsAction.java

@@ -0,0 +1,83 @@
+package nl.andrewlalis.erme.control.actions;
+
+import javax.swing.*;
+import javax.swing.event.HyperlinkEvent;
+import java.awt.*;
+import java.awt.event.ActionEvent;
+import java.io.*;
+import java.net.URI;
+import java.net.URISyntaxException;
+import java.nio.file.Files;
+
+public class InstructionsAction extends AbstractAction {
+	private static InstructionsAction instance;
+
+	public static InstructionsAction getInstance() {
+		if (instance == null) instance = new InstructionsAction();
+		return instance;
+	}
+
+	public InstructionsAction() {
+		super("Instructions");
+		this.putValue(SHORT_DESCRIPTION, "Instructions for how to use this program.");
+	}
+
+	@Override
+	public void actionPerformed(ActionEvent e) {
+		JDialog dialog = new JDialog(SwingUtilities.getWindowAncestor((Component) e.getSource()), "Instructions", Dialog.ModalityType.APPLICATION_MODAL);
+		JTextPane textPane = new JTextPane();
+		textPane.setEditable(false);
+		textPane.setContentType("text/html");
+		try {
+			textPane.setText(this.readFile());
+			textPane.addHyperlinkListener(event -> {
+				if (event.getEventType() == HyperlinkEvent.EventType.ACTIVATED) {
+					if (!Desktop.isDesktopSupported()) {
+						JOptionPane.showMessageDialog(dialog, "Desktop API not supported. You may still visit the link manually:\n" + event.getURL(), "Desktop API Not Supported", JOptionPane.WARNING_MESSAGE);
+					} else {
+						Desktop desktop = Desktop.getDesktop();
+						try {
+							desktop.browse(event.getURL().toURI());
+						} catch (IOException | URISyntaxException ex) {
+							ex.printStackTrace();
+							JOptionPane.showMessageDialog(dialog, "An error occurred and the URL could not be opened:\n" + event.getURL(), "URL Could Not Open", JOptionPane.ERROR_MESSAGE);
+						}
+					}
+				}
+			});
+		} catch (IOException ex) {
+			ex.printStackTrace();
+			JOptionPane.showMessageDialog(
+					(Component) e.getSource(),
+					"An error occured:\n" + ex.getMessage(),
+					"Error",
+					JOptionPane.ERROR_MESSAGE
+			);
+			textPane.setContentType("text/plain");
+			textPane.setText("Unable to load content.");
+		}
+		JScrollPane scrollPane = new JScrollPane(textPane, ScrollPaneConstants.VERTICAL_SCROLLBAR_AS_NEEDED, ScrollPaneConstants.HORIZONTAL_SCROLLBAR_AS_NEEDED);
+		dialog.setContentPane(scrollPane);
+		dialog.setMaximumSize(new Dimension(600, 800));
+		dialog.setPreferredSize(new Dimension(600, 800));
+		dialog.pack();
+		dialog.setLocationRelativeTo(null);
+		dialog.setVisible(true);
+	}
+
+	private String readFile() throws IOException {
+		InputStream is = getClass().getClassLoader().getResourceAsStream("html/instructions.html");
+		if (is == null) {
+			throw new IOException("Could not get stream for instructions.html.");
+		}
+		StringBuilder sb = new StringBuilder();
+		try (BufferedReader reader = new BufferedReader(new InputStreamReader(is))) {
+			String line = reader.readLine();
+			while (line != null) {
+				sb.append(line).append('\n');
+				line = reader.readLine();
+			}
+		}
+		return sb.toString();
+	}
+}

src/main/java/nl/andrewlalis/erme/view/EditorMenuBar.java

@@ -1,6 +1,5 @@
 package nl.andrewlalis.erme.view;
 
-import nl.andrewlalis.erme.EntityRelationMappingEditor;
 import nl.andrewlalis.erme.control.actions.*;
 import nl.andrewlalis.erme.control.actions.edits.AddAttributeAction;
 import nl.andrewlalis.erme.control.actions.edits.AddRelationAction;
@@ -8,9 +7,6 @@ import nl.andrewlalis.erme.control.actions.edits.RemoveAttributeAction;
 import nl.andrewlalis.erme.control.actions.edits.RemoveRelationAction;
 
 import javax.swing.*;
-import java.awt.*;
-import java.io.IOException;
-import java.net.URI;
 
 /**
  * The menu bar that's visible atop the application.
@@ -48,28 +44,8 @@ public class EditorMenuBar extends JMenuBar {
 
 	private JMenu buildHelpMenu() {
 		JMenu menu = new JMenu("Help");
-		JMenuItem instructionsItem = new JMenuItem("GitHub (Instructions)");
+		menu.add(InstructionsAction.getInstance());
-		instructionsItem.addActionListener(e -> {
+		menu.add(AboutAction.getInstance());
-			try {
-				Desktop.getDesktop().browse(URI.create("https://github.com/andrewlalis/EntityRelationMappingEditor"));
-			} catch (IOException ioException) {
-				ioException.printStackTrace();
-			}
-		});
-		menu.add(instructionsItem);
-		JMenuItem aboutItem = new JMenuItem("About");
-		aboutItem.addActionListener(e -> JOptionPane.showMessageDialog(
-				(Component) e.getSource(),
-				"Entity-Relation Mapping Editor\n" +
-						"by Andrew Lalis\n" +
-						"Version " + EntityRelationMappingEditor.VERSION + "\n" +
-						"To report bugs or make suggestions, please visit the GitHub\n" +
-						"repository for this application and create a new issue.\n\n" +
-						"Thank you for using the ERME!",
-				"About ERME",
-				JOptionPane.INFORMATION_MESSAGE
-		));
-		menu.add(aboutItem);
 		return menu;
 	}
 }

src/main/resources/html/instructions.html

@@ -0,0 +1,56 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="UTF-8">
+    <title>Instructions</title>
+</head>
+<body>
+
+<h1>Entity-Relation Mapping Editor</h1>
+<p>Created by <a href="https://github.com/andrewlalis">@andrewlalis</a></p>
+
+<p><em>A simple UI for editing entity-relation mapping diagrams.</em></p>
+
+<p>
+    Have you noticed any unexpected behavior? Is there something you thing would make a good addition to this application?
+    <a href="https://github.com/andrewlalis/EntityRelationMappingEditor/issues">Create a new issue on GitHub!</a>
+</p>
+
+<h3>Instructions for Use</h3>
+<p>
+    The interface and menus should be pretty self-explanatory, so they'll just be covered here in light detail.
+</p>
+<ul>
+    <li>
+        The <em>File</em> menu contains options for creating a new model, saving, loading or exporting a model, and finally an option to quit the program.
+    </li>
+    <li>
+        The <em>Edit</em> menu contains options for making changes to the current model, such as adding or removing relations and attributes, or undoing/redoing actions.
+    </li>
+    <li>
+        The <em>Help</em> menu contains some items with additional information about the application, like this help page and a simple <em>About</em> popup with version information.
+    </li>
+</ul>
+<p>
+    The main focus of the application is the <em>Diagram Panel</em> where all of the editing actually takes place. This is where any relations you create, or attributes you create, appear; this is what is rendered when you select the option to export your model to an image.
+</p>
+<ul>
+    <li>
+        Click on a relation to select it.
+    </li>
+    <li>
+        CTRL+Click to select multiple relations at once.
+    </li>
+    <li>
+        Drag relations to move them around the workspace.
+    </li>
+    <li>
+        Right-click on different areas to access a context menu with some helpful actions.
+    </li>
+    <li>
+        When exporting the model to an image, be sure to add the desired image file extension (.png, .jpg, .bmp, etc.), or the application will default to .png.
+    </li>
+</ul>
+
+</body>
+</html>