refactoring, moved panel views into separate files, added generic generator of paneViews

src/main/java/cz/muni/fi/pv168/project/ui/ViewBar/StatisticsPanel.java

+package cz.muni.fi.pv168.project.ui.ViewBar;
+
+import cz.muni.fi.pv168.project.data.Category;
+import cz.muni.fi.pv168.project.ui.main.statistic.CategoryStatistic;
+import cz.muni.fi.pv168.project.ui.main.statistic.StatisticsTable;
+
+import javax.swing.JScrollPane;
+import java.awt.Color;
+import java.util.Arrays;
+import java.util.List;
+
+public class StatisticsPanel extends JScrollPane {
+    private static final List<CategoryStatistic> statisticsSampleData = Arrays.asList(
+            new CategoryStatistic(new Category("Work", Color.RED), 236),
+            new CategoryStatistic(new Category("Partner", Color.BLUE), 36),
+            new CategoryStatistic(new Category("School", Color.GREEN), 23676));
+
+    public StatisticsPanel() {
+        super(new StatisticsTable(statisticsSampleData));
+    }
+}

src/main/java/cz/muni/fi/pv168/project/ui/ViewBar/TasksPanel.java

+package cz.muni.fi.pv168.project.ui.ViewBar;
+
+import cz.muni.fi.pv168.project.ui.main.TaskList;
+
+import javax.swing.JScrollPane;
+
+public class TasksPanel extends JScrollPane {
+    public TasksPanel() {
+        // TODO MileStone 2 connect to real database
+        super(new TaskList());
+    }
+}

src/main/java/cz/muni/fi/pv168/project/ui/ViewBar/ViewBarInstances.java

+package cz.muni.fi.pv168.project.ui.ViewBar;
+
+import java.util.Locale;
+
+public enum ViewBarInstances {
+    TASKS(TasksPanel.class),
+    STATISTICS(StatisticsPanel.class);
+
+    private final Class<?> type;
+
+    ViewBarInstances(Class<?> type) {
+        this.type = type;
+    }
+
+    public Class<?> getType() {
+        return this.type;
+    }
+
+    @Override
+    public String toString() {
+        String value = this.name().replace("_", " ");
+        return value.charAt(0) + value.substring(1).toLowerCase(Locale.ROOT);
+    }
+}
+

src/main/java/cz/muni/fi/pv168/project/ui/main/MainWindow.java

 package cz.muni.fi.pv168.project.ui.main;
 
-import cz.muni.fi.pv168.project.data.Category;
-import cz.muni.fi.pv168.project.ui.main.statistic.CategoryStatistic;
-import cz.muni.fi.pv168.project.ui.main.statistic.StatisticsTable;
+import cz.muni.fi.pv168.project.ui.ViewBar.TasksPanel;
+import cz.muni.fi.pv168.project.ui.ViewBar.ViewBarInstances;
 
 import javax.swing.JButton;
+import javax.swing.JComponent;
 import javax.swing.JFrame;
 import javax.swing.JLabel;
 import javax.swing.JPanel;
 import javax.swing.JScrollPane;
 import javax.swing.JTabbedPane;
-import javax.swing.JTable;
 import javax.swing.JToolBar;
 import javax.swing.SwingConstants;
 import javax.swing.WindowConstants;
 import javax.swing.border.EtchedBorder;
 import java.awt.BorderLayout;
-import java.awt.Color;
 import java.awt.Dimension;
 import java.awt.event.ComponentAdapter;
 import java.awt.event.ComponentEvent;
-import java.util.Arrays;
-import java.util.List;
 
 @SuppressWarnings({"Indentation", "CommentsIndentation"}) // JComponent hierarchy
 public class MainWindow {
-    private JFrame mainFrame;
-        private JPanel mainPanel;
-            private JToolBar mainToolBar;
-                private JButton addTaskButton;
-                private JButton addCategoryButton;
-                private JButton removeTaskButton;
-                private JButton removeCategoryButton;
-                private JButton editTaskButton;
-            private JTabbedPane tabbedPane;
-                private JPanel taskPanel;
-                    private TaskView taskView;
-                private JTable categoryStatisticsTable;
-    // TODO milestone-02 connect with live data
-    private final List<CategoryStatistic> statisticsSampleData = Arrays.asList(
-            new CategoryStatistic(new Category("Work", Color.RED), 236),
-            new CategoryStatistic(new Category("Partner", Color.BLUE), 36),
-            new CategoryStatistic(new Category("School", Color.GREEN), 23676));
+    private final JFrame mainFrame;
+    private final JPanel mainPanel;
+    private final JToolBar mainToolBar;
+    private final JScrollPane taskPane;
+    private final JScrollPane statisticsPane;
+    private JButton addTaskButton;
+    private JButton addCategoryButton;
+    private JButton removeTaskButton;
+    private JButton removeCategoryButton;
+    private JButton editTaskButton;
+    private JTabbedPane tabbedPane;
 
     public MainWindow() {
         mainFrame = new JFrame();
         mainPanel = new JPanel(new BorderLayout());
 
-        categoryStatisticsTable = new StatisticsTable(statisticsSampleData);
+        taskPane = new TasksPanel();
+        statisticsPane = new TasksPanel();
 
         mainToolBar = createToolBar();
 
@@ -66,22 +57,31 @@ public class MainWindow {
     }
 
     private void createTabbedPane() {
-        taskView = new TaskView();
         tabbedPane = new JTabbedPane();
         tabbedPane.setBorder(new EtchedBorder());
 
-        tabbedPane.add(new JScrollPane(taskView));
-        tabbedPane.setTabComponentAt(0, new JLabel("Tasks", SwingConstants.CENTER));
-        tabbedPane.add(new JScrollPane(categoryStatisticsTable));
-        tabbedPane.setTabComponentAt(1, new JLabel("Statistics", SwingConstants.CENTER));
-
+        int index = 0;
+        for (var instance : ViewBarInstances.values()
+        ) {
+            final JComponent component;
+            try {
+                component = (JScrollPane) instance.getType().getConstructor().newInstance();
+            } catch (Exception e) {
+                // TODO make it more robust and handle the exception properly
+                System.out.print(String.format("Error creating [%s] component", instance.toString()));
+                continue;
+            }
+            tabbedPane.add((component));
+            tabbedPane.setTabComponentAt(index, new JLabel(instance.toString(), SwingConstants.CENTER));
+            index += 1;
+        }
         // make tabs span (nearly) the whole width of the window
         tabbedPane.addComponentListener(new ComponentAdapter() {
             @Override
             public void componentResized(ComponentEvent e) {
-                for (int i = 0; i < 2; i++) {
+                for (int i = 0; i < ViewBarInstances.values().length; i++) {
                     JLabel tab = (JLabel) tabbedPane.getTabComponentAt(i);
-                    Dimension newDimension = new Dimension(tabbedPane.getWidth() / 2 - 30, tab.getFontMetrics(tab.getFont()).getHeight());
+                    Dimension newDimension = new Dimension(tabbedPane.getWidth() / ViewBarInstances.values().length - 30, tab.getFontMetrics(tab.getFont()).getHeight());
                     // setting only one doesn't work when maximizing
                     tab.setPreferredSize(newDimension);
                     tab.setSize(newDimension);

src/test/java/cz/muni/fi/pv168/project/testingData/TestingDataSet.java

+package cz.muni.fi.pv168.project.testingData;
+
+import cz.muni.fi.pv168.project.data.Category;
+import cz.muni.fi.pv168.project.ui.main.statistic.CategoryStatistic;
+
+import java.awt.Color;
+import java.util.Arrays;
+import java.util.List;
+
+public class TestingDataSet {
+
+    private static final List<CategoryStatistic> statisticsSampleData = Arrays.asList(
+            new CategoryStatistic(new Category("Work", Color.RED), 236),
+            new CategoryStatistic(new Category("Partner", Color.BLUE), 36),
+            new CategoryStatistic(new Category("School", Color.GREEN), 23676));
+}