various small fixes

src/me/teridax/jcash/Main.java

@@ -53,6 +53,8 @@ public final class Main {
     }
 
     private void initialize() {
+        // create the login mask
+
         this.loginMask = new LoginController();
 
         // when we have logged in set the account viewer as window content
@@ -64,6 +66,8 @@ public final class Main {
 
         this.window.getContentPane().add(loginMask.getView(), LOGIN_SCREEN_STRING_IDENT);
 
+        // create the account viewer
+
         this.accountController = new AccountController();
         this.window.getContentPane().add(accountController.getView(), PROFILE_SCREEN_STRING_IDENT);
     }
@@ -72,7 +76,9 @@ public final class Main {
         this.bms = Loader.load();
         this.loginMask.setBankingManagementSystem(bms);
         showLoginScreen();
-        this.window.setSize(800, 600);
+        this.window.pack();
+        this.window.setResizable(false);
+        this.window.setLocationRelativeTo(null);
         this.window.setVisible(true);
     }
 
@@ -90,13 +96,16 @@ public final class Main {
         getInstance().loadDatabase();
     }
 
+    /**
+     * Loads the extra font file used on the login button
+     */
     private static void loadExtraFont() {
         try {
-            var font = Font.createFont(Font.TRUETYPE_FONT, IconProvider.class.getResourceAsStream("res/Circus.ttf"));
+            var font = Font.createFont(Font.TRUETYPE_FONT, Objects.requireNonNull(IconProvider.class.getResourceAsStream("res/Circus.ttf")));
             GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment();
             ge.registerFont(font);
-        } catch (IOException | FontFormatException e) {
-            e.printStackTrace();
+        } catch (IOException | FontFormatException | NullPointerException e) {
+            LOGGER.warning("Could not load font file: " + e.getMessage());
         }
     }
 
@@ -173,6 +182,7 @@ public final class Main {
      * Logs the user out of the database, hiding the main window.
      */
     public void logout() {
+        this.loginMask.logout();
         this.layout.show(this.window.getContentPane(), LOGIN_SCREEN_STRING_IDENT);
     }
 

src/me/teridax/jcash/decode/StringDecoder.java

@@ -29,6 +29,16 @@ public class StringDecoder {
         return formatter;
     }
 
+    public static Object getIntegerNumberFormatter() {
+        var formatter = new NumberFormatter();
+        formatter.setValueClass(Integer.class);
+        formatter.setMinimum(0d);
+        formatter.setAllowsInvalid(true);
+        formatter.setCommitsOnValidEdit(true);
+
+        return formatter;
+    }
+
     /**
      * Attempts to convert the given string into a double value representing a percentage.
      * The output value will be in the range [0, 100]. Strings formatted without a percentage
@@ -129,7 +139,7 @@ public class StringDecoder {
 
         var trimmed = name.trim();
 
-        var pattern = Pattern.compile("[^\\s]+", Pattern.CASE_INSENSITIVE);
+        var pattern = Pattern.compile("[^\\d]+", Pattern.CASE_INSENSITIVE);
         var matcher = pattern.matcher(trimmed);
         if (matcher.find()) {
             return matcher.group();

src/me/teridax/jcash/gui/IconProvider.java

@@ -26,7 +26,7 @@ public class IconProvider {
         return DEFAULT_IMAGE;
     }
 
-    public static Image getSetupIcon() {
-        return loadIcon("res/login.jpg");
+    public static Image getBackground() {
+        return loadIcon("res/background.png");
     }
 }

src/me/teridax/jcash/gui/NumberDocumentFilter.java

@@ -1,17 +0,0 @@
-package me.teridax.jcash.gui;
-
-import javax.swing.text.AttributeSet;
-import javax.swing.text.BadLocationException;
-import javax.swing.text.DocumentFilter;
-import javax.swing.text.NumberFormatter;
-
-public class NumberDocumentFilter extends DocumentFilter {
-    @Override
-    public void insertString(FilterBypass fb, int offset, String string, AttributeSet attr) throws BadLocationException {
-        super.insertString(fb, offset, string, attr);
-    }
-
-    private String filterString(String text) {
-        return "";
-    }
-}

src/me/teridax/jcash/gui/Utils.java

@@ -32,6 +32,9 @@ public class Utils {
         constraints.fill = GridBagConstraints.HORIZONTAL;
         target.add(new JLabel(name, SwingConstants.RIGHT), constraints);
 
+        if (comp == null)
+            return;
+
         constraints.gridx = 2;
         constraints.gridy = row;
         constraints.weightx = 1;

src/me/teridax/jcash/gui/login/LoginController.java

@@ -57,13 +57,13 @@ public class LoginController {
         var blz = this.view.getBlz().getText();
         var iban = this.getIban();
         if (iban.isEmpty()) {
-            Utils.error("no IBAN entered");
+            Utils.error("invalid IBAN entered");
             return;
         }
 
         var pin = this.getPin();
         if (pin.isEmpty()) {
-            Utils.error("no PIN entered");
+            Utils.error("invalid PIN entered");
             return;
         }
 
@@ -86,4 +86,8 @@ public class LoginController {
     public LoginData getData() {
         return data;
     }
+
+    public void logout() {
+        this.view.getPin().setText("");
+    }
 }

src/me/teridax/jcash/gui/login/LoginView.java

@@ -1,15 +1,12 @@
 package me.teridax.jcash.gui.login;
 
+import me.teridax.jcash.decode.StringDecoder;
 import me.teridax.jcash.gui.IconProvider;
 
 import javax.swing.*;
 import javax.swing.text.*;
 import java.awt.*;
-import java.io.IOException;
-import java.text.NumberFormat;
 
-import static java.awt.BorderLayout.NORTH;
-import static javax.swing.SwingConstants.CENTER;
 import static me.teridax.jcash.gui.Utils.addGridBagRow;
 import static me.teridax.jcash.gui.Utils.addHeading;
 import static me.teridax.jcash.lang.Translator.translate;
@@ -33,41 +30,47 @@ public class LoginView extends JPanel {
     }
 
     private void layoutComponents() {
-        var content = new JPanel(new GridBagLayout());
+        var content = new JLabel();
+        content.setIcon(new ImageIcon(IconProvider.getBackground()));
+        content.setLayout(new BorderLayout());
 
-        this.setBorder(BorderFactory.createEmptyBorder(8, 8, 8, 8));
-        this.setLayout(new BorderLayout(16, 16));
+        var loginPane = new JPanel(new GridBagLayout());
+        loginPane.setOpaque(true);
+        content.add(loginPane, BorderLayout.CENTER);
+        content.add(Box.createHorizontalStrut(400), BorderLayout.WEST);
+
+        this.setLayout(new BorderLayout(32, 32));
         this.add(new JScrollPane(content), BorderLayout.CENTER);
-        this.add(new JLabel(addHeading(translate("Cashmachine")), CENTER), NORTH);
 
         var constraints = new GridBagConstraints();
 
         constraints.gridwidth = 4;
         constraints.insets = new Insets(12, 12, 12, 12);
 
-        addGridBagRow(constraints, content, blz, 1, translate("BLZ"));
-        addGridBagRow(constraints, content, iban, 2, translate("IBAN"));
-        addGridBagRow(constraints, content, pin, 3, translate("PIN"));
+        addGridBagRow(constraints, loginPane, new JLabel(addHeading(translate("Cashmachine"))), 0, "");
+        addGridBagRow(constraints, loginPane, blz, 1, translate("BLZ"));
+        addGridBagRow(constraints, loginPane, iban, 2, translate("IBAN"));
+        addGridBagRow(constraints, loginPane, pin, 3, translate("PIN"));
 
         constraints.gridy = 4;
         constraints.anchor = GridBagConstraints.PAGE_END;
         constraints.weightx = 0;
         constraints.fill = GridBagConstraints.NONE;
-        constraints.insets = new Insets(12, 12, 12, 12);
-        content.add(login, constraints);
+        constraints.insets = new Insets(0, 0, 0, 12);
+        loginPane.add(login, constraints);
     }
 
     private void createComponents() {
         this.blz = new JFormattedTextField();
-        this.iban = new JFormattedTextField(getNumberFormat());
+        this.iban = new JFormattedTextField();
         this.pin = new JPasswordField();
         this.login = new JButton(translate("Login"));
 
-        this.login.setFont(new Font("Circus", Font.PLAIN, 72));
-        this.login.setBackground(Color.RED);
-        this.login.setForeground(Color.CYAN);
+        this.login.setFont(new Font("Circus", Font.PLAIN, 28));
+        this.login.setBackground(Color.CYAN);
 
         restrictPasswordToDigits();
+        restrictIbanInput();
     }
 
     /**
@@ -88,17 +91,22 @@ public class LoginView extends JPanel {
         });
     }
 
-    private NumberFormatter getNumberFormat() {
-        var format = NumberFormat.getIntegerInstance();
-        format.setGroupingUsed(false);
+    /**
+     * Adds a document filter onto {@link #iban} that filters out everything that is not a digit.
+     * The filter also restricts the amount of digits that can be entered to {@link #MAX_PIN_DECIMAL_DIGITS}
+     */
+    private void restrictIbanInput() {
+        ((AbstractDocument) this.iban.getDocument()).setDocumentFilter(new DocumentFilter() {
+            @Override
+            public void replace(FilterBypass fb, int offset, int length, String text, AttributeSet attrs)
+                    throws BadLocationException {
+                String newText = fb.getDocument().getText(0, fb.getDocument().getLength()) + text;
 
-        var formatter = new NumberFormatter(format);
-        formatter.setValueClass(Integer.class);
-        formatter.setMinimum(0);
-        formatter.setMaximum(Integer.MAX_VALUE);
-        formatter.setAllowsInvalid(false);
-
-        return formatter;
+                if (newText.matches(String.format("\\d{1,%s}", MAX_PIN_DECIMAL_DIGITS))) {
+                    super.replace(fb, offset, length, text, attrs);
+                }
+            }
+        });
     }
 
     public JTextField getBlz() {

src/me/teridax/jcash/gui/res/image-sources.md

@@ -1,2 +1,4 @@
 https://pixabay.com/vectors/register-cash-register-modern-23666/
 ![register](https://cdn.pixabay.com/photo/2012/04/01/17/34/register-23666_960_720.png)
+Font file
+https://www.dafont.com/de/circus.font?text=Login