multiple windows working with state

.gitignore

@@ -0,0 +1,38 @@
+target/
+!.mvn/wrapper/maven-wrapper.jar
+!**/src/main/**/target/
+!**/src/test/**/target/
+
+### IntelliJ IDEA ###
+.idea/modules.xml
+.idea/jarRepositories.xml
+.idea/compiler.xml
+.idea/libraries/
+*.iws
+*.iml
+*.ipr
+
+### Eclipse ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+build/
+!**/src/main/**/build/
+!**/src/test/**/build/
+
+### VS Code ###
+.vscode/
+
+### Mac OS ###
+.DS_Store

.idea/.gitignore

@@ -0,0 +1,3 @@
+# Default ignored files
+/shelf/
+/workspace.xml

.idea/encodings.xml

@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="Encoding">
+    <file url="file://$PROJECT_DIR$/src/main/java" charset="UTF-8" />
+    <file url="file://$PROJECT_DIR$/src/main/resources" charset="UTF-8" />
+  </component>
+</project>

.idea/misc.xml

@@ -0,0 +1,14 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ExternalStorageConfigurationManager" enabled="true" />
+  <component name="MavenProjectsManager">
+    <option name="originalFiles">
+      <list>
+        <option value="$PROJECT_DIR$/pom.xml" />
+      </list>
+    </option>
+  </component>
+  <component name="ProjectRootManager" version="2" languageLevel="JDK_21" default="true" project-jdk-name="jbr-21" project-jdk-type="JavaSDK">
+    <output url="file://$PROJECT_DIR$/out" />
+  </component>
+</project>

pom.xml

@@ -0,0 +1,26 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+
+    <groupId>de.dhsn.oop</groupId>
+    <artifactId>todo</artifactId>
+    <version>1.0-SNAPSHOT</version>
+
+    <properties>
+        <maven.compiler.source>21</maven.compiler.source>
+        <maven.compiler.target>21</maven.compiler.target>
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+    </properties>
+
+    <dependencies>
+        <!-- https://mvnrepository.com/artifact/com.google.code.gson/gson -->
+        <dependency>
+            <groupId>com.google.code.gson</groupId>
+            <artifactId>gson</artifactId>
+            <version>2.13.1</version>
+        </dependency>
+    </dependencies>
+
+</project>

src/main/java/de/dhsn/oop/Main.java

@@ -0,0 +1,14 @@
+package de.dhsn.oop;
+
+import de.dhsn.oop.data.TodoList;
+import de.dhsn.oop.ui.MainWindow;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class Main {
+    public static void main(String[] args) {
+        List<TodoList> listen = new ArrayList<>();
+        MainWindow mw = new MainWindow(listen);
+    }
+}

src/main/java/de/dhsn/oop/data/TextTodoItem.java

@@ -0,0 +1,7 @@
+package de.dhsn.oop.data;
+
+public class TextTodoItem extends TodoItem{
+    public TextTodoItem(String t) {
+        super(t);
+    }
+}

src/main/java/de/dhsn/oop/data/TodoItem.java

@@ -0,0 +1,31 @@
+package de.dhsn.oop.data;
+
+import javax.swing.*;
+import java.awt.*;
+
+public abstract class TodoItem extends JPanel {
+    public boolean done = false;
+    public String title;
+
+    private JLabel t;
+    private JCheckBox cbdone;
+
+    public TodoItem(String t){
+        title = t;
+        setLayout(new BorderLayout());
+        this.t = new JLabel(t);
+        cbdone = new JCheckBox();
+        add(cbdone, BorderLayout.LINE_START);
+        add(this.t, BorderLayout.CENTER);
+
+        setVisible(true);
+    }
+
+    public String getTitle() {
+        return title;
+    }
+
+    public void setTitle(String title) {
+        this.title = title;
+    }
+}

src/main/java/de/dhsn/oop/data/TodoList.java

@@ -0,0 +1,41 @@
+package de.dhsn.oop.data;
+
+import com.google.gson.Gson;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class TodoList {
+    List<TodoItem> list;
+    String listTitle;
+
+    public TodoList(String listTitle) {
+        this.listTitle = listTitle;
+        this.list = new ArrayList<>();
+    }
+
+    public String getListTitle() {
+        return listTitle;
+    }
+
+    public void setListTitle(String listTitle) {
+        this.listTitle = listTitle;
+    }
+
+    public void addTodo(TodoItem item){
+        list.add(item);
+    }
+
+    public List<TodoItem> getList(){
+        return list;
+    }
+
+    public int length(){
+        return list.toArray().length;
+    }
+
+    @Override
+    public String toString() {
+        return new Gson().toJson(this);
+    }
+}

src/main/java/de/dhsn/oop/ui/ListOverviewItem.java

@@ -0,0 +1,44 @@
+package de.dhsn.oop.ui;
+
+import de.dhsn.oop.data.TodoList;
+
+import javax.swing.*;
+import java.awt.*;
+
+/**
+ * Overview List Item to show Todo Lists on the home screen
+ */
+public class ListOverviewItem extends JPanel {
+    private JLabel titleText = new JLabel();
+    private JLabel title = new JLabel();
+    private JLabel length = new JLabel();
+    private JLabel lenghtText = new JLabel();
+
+    public ListOverviewItem(TodoList list) {
+        this.setLayout(new GridBagLayout());
+        GridBagConstraints c = new GridBagConstraints();
+        c.gridx = 0;
+        c.gridy = 0;
+
+        c.insets = new Insets(2,2,2,2);
+
+        title.setText(list.getListTitle());
+        title.setFont(title.getFont().deriveFont(Font.BOLD, 15f));
+        titleText.setText("Titel: ");
+        lenghtText.setText("Anz.: ");
+        length.setText(Integer.toString(list.length()));
+
+        this.add(titleText, c);
+        c.gridx++;
+
+        this.add(title, c);
+        c.gridx++;
+
+        this.add(lenghtText, c);
+        c.gridx++;
+
+        this.add(length, c);
+
+        this.setVisible(true);
+    }
+}

src/main/java/de/dhsn/oop/ui/ListsOverview.java

@@ -0,0 +1,25 @@
+package de.dhsn.oop.ui;
+
+import de.dhsn.oop.data.TodoList;
+
+import javax.swing.*;
+import java.awt.*;
+import java.util.List;
+
+public class ListsOverview extends JPanel {
+
+    public ListsOverview(List<TodoList> lists){
+        super();
+        this.setLayout(new GridBagLayout());
+        GridBagConstraints c = new GridBagConstraints();
+        c.insets = new Insets(2,2,2,2);
+        c.gridx=0;
+        c.gridy=0;
+        for(TodoList list: lists){
+            ListOverviewItem listOverviewItem = new ListOverviewItem(list);
+            this.add(listOverviewItem, c);
+            c.gridy++;
+        }
+        this.setVisible(true);
+    }
+}

src/main/java/de/dhsn/oop/ui/MainWindow.java

@@ -0,0 +1,96 @@
+package de.dhsn.oop.ui;
+
+import de.dhsn.oop.data.TodoList;
+import de.dhsn.oop.ui.helpers.TodoListListModel;
+
+import javax.swing.*;
+import javax.swing.event.ListDataListener;
+import javax.swing.event.ListSelectionEvent;
+import javax.swing.event.ListSelectionListener;
+import java.awt.*;
+import java.awt.event.ActionEvent;
+import java.awt.event.ActionListener;
+import java.awt.event.WindowAdapter;
+import java.awt.event.WindowEvent;
+import java.util.List;
+import java.util.Objects;
+
+public class MainWindow extends JFrame implements ActionListener, ListSelectionListener {
+    private JButton addNewList;
+    private List<TodoList> lists;
+    private JList<String> list;
+
+    /**
+     * Main window constructor, takes a (potentially empty) list of TodoList
+     * this list of lists is supposed to keep all application state for easy file save and open operations
+     * @param lists
+     * @throws HeadlessException
+     */
+    public MainWindow(List<TodoList> lists) throws HeadlessException {
+        super();
+        this.lists = lists;
+        Container cp = getContentPane();
+        cp.removeAll();
+        setTitle("Todo List");
+        setSize(new Dimension(800, 600));
+        setMinimumSize(new Dimension(400, 250));
+        setLayout(new BorderLayout());
+
+        list = new JList<>();
+        list.setModel(new TodoListListModel(lists));
+        list.addListSelectionListener(this);
+        cp.add(list, BorderLayout.NORTH);
+
+        addNewList = new JButton("Neue Liste Anlegen");
+        addNewList.addActionListener(this);
+        cp.add(addNewList, BorderLayout.SOUTH);
+
+        pack();
+        setVisible(true);
+
+        this.addWindowListener(new WindowAdapter() {
+            @Override
+            public void windowClosing(WindowEvent e) {
+                System.out.println("exit test");
+                System.out.println(lists);
+                System.exit(0);
+            }
+        });
+    }
+
+    /**
+     * listener function for the add new list button on the main page
+     * @param e the event to be processed
+     */
+    @Override
+    public void actionPerformed(ActionEvent e) {
+        new NewListDialog(this);
+    }
+
+    /**
+     * callback function to be called with a title for a new list
+     * this is called from NewListDialog when the user presses the save button
+     * @param title
+     * @return
+     */
+    public void nldCallback(String title){
+        boolean result = lists.add(new TodoList(title));
+
+        //overwrite list contents
+        list.setModel(new TodoListListModel(lists));
+    }
+
+    /**
+     * handle click events on the list of list titles
+     * displays the list in a new window
+     * @param e the event that characterizes the change.
+     */
+    @Override
+    public void valueChanged(ListSelectionEvent e) {
+        // two events are emitted - only execute the code once
+        if (e.getValueIsAdjusting()){
+            //show new window for the selected list
+            new TodoListView(lists.get(list.getSelectedIndex()));
+        }
+    }
+}

src/main/java/de/dhsn/oop/ui/NewListDialog.java

@@ -0,0 +1,37 @@
+package de.dhsn.oop.ui;
+
+import de.dhsn.oop.data.TodoList;
+
+import javax.swing.*;
+import java.awt.*;
+import java.awt.event.ActionEvent;
+import java.awt.event.ActionListener;
+import java.util.List;
+
+public class NewListDialog extends JFrame implements ActionListener {
+    private JTextField input = new JTextField("TODO");
+    private JButton confirm = new JButton("Anlegen");
+    private MainWindow mw;
+
+    public NewListDialog(MainWindow mw){
+        this.mw = mw;
+        Container cp = getContentPane();
+        setLayout(new BorderLayout());
+        JLabel l = new JLabel("Name der Liste: ");
+        cp.add(l, BorderLayout.LINE_START);
+
+        input.setColumns(15);
+        cp.add(input, BorderLayout.LINE_END);
+        confirm.addActionListener(this);
+        cp.add(confirm, BorderLayout.SOUTH);
+        pack();
+        setVisible(true);
+    }
+
+    @Override
+    public void actionPerformed(ActionEvent e) {
+        mw.nldCallback(input.getText().strip());
+        setVisible(false);
+        dispose();
+    }
+}

src/main/java/de/dhsn/oop/ui/TodoListView.java

@@ -0,0 +1,51 @@
+package de.dhsn.oop.ui;
+
+import de.dhsn.oop.data.TextTodoItem;
+import de.dhsn.oop.data.TodoItem;
+import de.dhsn.oop.data.TodoList;
+
+import javax.swing.*;
+import java.awt.*;
+
+public class TodoListView extends JFrame {
+    class TodoListItem extends JPanel {
+        public TodoListItem(TodoItem item) {
+
+        }
+    }
+
+    JLabel title;
+    TodoList list;
+
+    public TodoListView(TodoList list) {
+        super();
+        this.list = list;
+
+        for(int i = 0; i < 32; i++)
+            this.list.addTodo(new TextTodoItem("item " + i));
+
+        setMinimumSize(new Dimension(100, 100));
+        setSize(new Dimension(100, 300));
+        Container cp = getContentPane();
+        setLayout(new BorderLayout());
+        title = new JLabel(list.getListTitle());
+        cp.add(title, BorderLayout.NORTH);
+
+        // scrolling content panel
+        JPanel scrollContent = new JPanel();
+        //not setting a size results in immediate collapsing of the lsit upon resizing the window
+        scrollContent.setMinimumSize(new Dimension(50,50));
+        scrollContent.setLayout(new BoxLayout(scrollContent, BoxLayout.Y_AXIS));
+
+        //add all todoitems in the list to the scrolpane
+        for (TodoItem t : list.getList())
+            scrollContent.add(t);
+
+        JScrollPane scp = new JScrollPane(scrollContent);
+
+        cp.add(scp,BorderLayout.CENTER);
+
+        pack();
+        setVisible(true);
+    }
+}

src/main/java/de/dhsn/oop/ui/helpers/TodoListListModel.java

@@ -0,0 +1,32 @@
+package de.dhsn.oop.ui.helpers;
+
+import de.dhsn.oop.data.TodoList;
+
+import javax.swing.*;
+import javax.swing.event.ListDataListener;
+import java.util.List;
+
+public class TodoListListModel implements ListModel<String> {
+    List<TodoList> global;
+    public TodoListListModel(List<TodoList> lists){
+        global = lists;
+    }
+    @Override
+    public int getSize() {
+        return global.size();
+    }
+
+    @Override
+    public String getElementAt(int index) {
+        return ((TodoList) global.get(index)).getListTitle();
+    }
+
+    @Override
+    public void addListDataListener(ListDataListener l) {
+    }
+
+    @Override
+    public void removeListDataListener(ListDataListener l) {
+
+    }
+}