failed experiment.

src/main/java/nl/andrewlalis/blockbookbinder/model/BookPage.java

@@ -2,64 +2,65 @@ package nl.andrewlalis.blockbookbinder.model;
 
 import nl.andrewlalis.blockbookbinder.util.ApplicationProperties;
 
-import java.util.ArrayList;
-import java.util.List;
+import java.util.Arrays;
 
 public class BookPage {
-	private final List<String> lines;
+	public static final int MAX_LINES = ApplicationProperties.getIntProp("book.page_max_lines");
+	private final String[] lines;
 
 	public BookPage() {
-		this.lines = new ArrayList<>(ApplicationProperties.getIntProp("book.page_max_lines"));
+		this.lines = new String[MAX_LINES];
+		Arrays.fill(this.lines, "");
 	}
 
-	public boolean addLine(String line) {
-		if (this.lines.size() >= ApplicationProperties.getIntProp("book.page_max_lines")) {
-			return false;
+	private BookPage(String[] lines) {
+		this.lines = lines;
 	}
-		this.lines.add(line);
-		return true;
+
+	public void setLine(int index, String line) {
+		if (index < 0 || index >= this.lines.length) {
+			throw new IndexOutOfBoundsException(index);
+		}
+		this.lines[index] = line;
 	}
 
 	public String getLine(int index) {
-		if (index < 0 || index >= this.lines.size()) {
-			return null;
+		if (index < 0 || index >= this.lines.length) {
+			throw new IndexOutOfBoundsException(index);
 		}
-		return this.lines.get(index);
+		return this.lines[index];
 	}
 
+	/**
+	 * Gets the index of the line at which this offset occurs.
+	 * @param offset The offset, from the start of the page.
+	 * @return The index of the line in which the given offset is placed.
+	 */
 	public int getLineIndexAtOffset(int offset) {
 		int lineIndex = 0;
 		String line = this.getLine(lineIndex);
-		if (line == null) return -1;
 		while (offset - line.length() > 0) {
-			offset-= line.length();
-			line = this.getLine(++lineIndex);
+			offset -= line.length();
+			line = this.getLine(lineIndex++);
 		}
 		return lineIndex;
 	}
 
 	public boolean hasContent() {
-		return !this.lines.isEmpty();
+		for (String line : this.lines) {
+			if (!line.isBlank()) {
+				return true;
+			}
+		}
+		return false;
 	}
 
 	public BookPage copy() {
-		BookPage c = new BookPage();
-		for (String line : this.lines) {
-			c.addLine(line);
-		}
-		return c;
+		return new BookPage(Arrays.copyOf(this.lines, MAX_LINES));
 	}
 
 	@Override
 	public String toString() {
 		return String.join("\n", this.lines);
 	}
-
-	public static BookPage fromString(String s) {
-		BookPage p = new BookPage();
-		for (String line : s.split("\n")) {
-			p.addLine(line);
-		}
-		return p;
-	}
 }

src/main/java/nl/andrewlalis/blockbookbinder/model/build/BookBuilder.java

@@ -2,8 +2,8 @@ package nl.andrewlalis.blockbookbinder.model.build;
 
 import nl.andrewlalis.blockbookbinder.model.Book;
 import nl.andrewlalis.blockbookbinder.model.BookPage;
-import nl.andrewlalis.blockbookbinder.util.CharWidthMapper;
 import nl.andrewlalis.blockbookbinder.util.ApplicationProperties;
+import nl.andrewlalis.blockbookbinder.util.CharWidthMapper;
 
 import java.util.ArrayList;
 import java.util.List;
@@ -15,22 +15,22 @@ public class BookBuilder {
 	 * @return A book containing the source text formatted for a minecraft book.
 	 */
 	public Book build(String source) {
-		final int maxLines = ApplicationProperties.getIntProp("book.page_max_lines");
 		List<String> lines = this.convertSourceToLines(this.cleanSource(source));
 		Book book = new Book();
 		BookPage page = new BookPage();
 		int currentPageLineCount = 0;
 
 		for (String line : lines) {
-			page.addLine(line);
+			page.setLine(currentPageLineCount, line);
 			currentPageLineCount++;
-			if (currentPageLineCount == maxLines) {
+			if (currentPageLineCount == BookPage.MAX_LINES) {
 				book.addPage(page);
 				page = new BookPage();
 				currentPageLineCount = 0;
 			}
 		}
 
+		// Check the last page, and only add it if it contains content.
 		if (page.hasContent()) {
 			book.addPage(page);
 		}

src/main/java/nl/andrewlalis/blockbookbinder/view/book/BookPreviewPanel.java

@@ -19,7 +19,7 @@ public class BookPreviewPanel extends JPanel {
 	private Book book;
 	private int currentPage = 0;
 
-	private final JTextArea previewPageTextArea;
+	private final JEditorPane pageEditorPane;
 	private final BookPageDocumentFilter documentFilter;
 	private final JLabel titleLabel;
 
@@ -35,11 +35,11 @@ public class BookPreviewPanel extends JPanel {
 		this.add(this.titleLabel, BorderLayout.NORTH);
 		this.setBorder(new EmptyBorder(5, 5, 5, 5));
 
-		this.previewPageTextArea = new JTextArea();
+		this.pageEditorPane = new JEditorPane();
 		this.documentFilter = new BookPageDocumentFilter();
-		AbstractDocument doc = (AbstractDocument) this.previewPageTextArea.getDocument();
+		AbstractDocument doc = (AbstractDocument) this.pageEditorPane.getDocument();
 		doc.setDocumentFilter(this.documentFilter);
-		this.previewPageTextArea.setEditable(true);
+		this.pageEditorPane.setEditable(true);
 		try {
 			InputStream is = this.getClass().getClassLoader().getResourceAsStream("fonts/1_Minecraft-Regular.otf");
 			if (is == null) {
@@ -47,11 +47,11 @@ public class BookPreviewPanel extends JPanel {
 			}
 			Font mcFont = Font.createFont(Font.TRUETYPE_FONT, is);
 			mcFont = mcFont.deriveFont(24.0f);
-			this.previewPageTextArea.setFont(mcFont);
+			this.pageEditorPane.setFont(mcFont);
 		} catch (FontFormatException | IOException e) {
 			e.printStackTrace();
 		}
-		JScrollPane previewPageScrollPane = new JScrollPane(this.previewPageTextArea, JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED, JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED);
+		JScrollPane previewPageScrollPane = new JScrollPane(this.pageEditorPane, JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED, JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED);
 		this.add(previewPageScrollPane, BorderLayout.CENTER);
 
 		JPanel previewButtonPanel = new JPanel(new FlowLayout(FlowLayout.CENTER));
@@ -99,7 +99,7 @@ public class BookPreviewPanel extends JPanel {
 			return;
 		}
 		BookPage currentPage = this.book.getPages().get(this.currentPage);
-		this.previewPageTextArea.setText(currentPage.toString());
+		this.pageEditorPane.setText(currentPage.toString());
 		this.titleLabel.setText("Book Preview (Page " + (this.currentPage + 1) + " of " + this.book.getPageCount() + ")");
 	}