refactor: replace current collection window

Replace CurrentCollectionWindow with CollectionDisplayWindow.

app/src/main/java/ru/project/ui/window/CollectionDisplayWindow.java

@@ -0,0 +1,102 @@
+package ru.project.ui.window;
+
+import com.googlecode.lanterna.TerminalSize;
+import com.googlecode.lanterna.gui2.Button;
+import com.googlecode.lanterna.gui2.Direction;
+import com.googlecode.lanterna.gui2.EmptySpace;
+import com.googlecode.lanterna.gui2.LinearLayout;
+import com.googlecode.lanterna.gui2.Panel;
+import com.googlecode.lanterna.gui2.TextBox;
+import com.googlecode.lanterna.gui2.WindowBasedTextGUI;
+import com.googlecode.lanterna.input.KeyStroke;
+import com.googlecode.lanterna.input.KeyType;
+import ru.project.collection.MyList;
+import ru.project.student.Student;
+import ru.project.ui.base.BaseWindow;
+
+public class CollectionDisplayWindow extends BaseWindow {
+
+  private final MyList<Student> collection;
+
+  private TextBox collectionTextBox;
+  private Button exitButton;
+
+  public CollectionDisplayWindow(WindowBasedTextGUI gui, MyList<Student> collection) {
+
+    super("Просмотр коллекции", gui);
+
+    this.collection = collection;
+
+    Panel panel = createPanel();
+
+    setComponent(panel);
+
+    exitButton.takeFocus();
+  }
+
+  @Override
+  public boolean handleInput(KeyStroke key) {
+    if (key.getKeyType() == KeyType.Escape && collectionTextBox.isFocused()) {
+
+      exitButton.takeFocus();
+      return true;
+    }
+
+    return super.handleInput(key);
+  }
+
+  private Panel createPanel() {
+    Panel panel = new Panel();
+
+    panel.setLayoutManager(new LinearLayout(Direction.VERTICAL));
+
+    addCollectionDisplay(panel);
+    addExitButton(panel);
+
+    return panel;
+  }
+
+  private void addCollectionDisplay(Panel panel) {
+    collectionTextBox = createCollectionScrollBox();
+
+    panel.addComponent(collectionTextBox);
+  }
+
+  private TextBox createCollectionScrollBox() {
+    TextBox textBox = new TextBox(new TerminalSize(80, 20), TextBox.Style.MULTI_LINE);
+
+    textBox.setReadOnly(true);
+
+    if (collection == null || collection.isEmpty()) {
+      textBox.setText("Коллекция пуста.");
+    } else {
+      textBox.setText(buildCollectionText());
+    }
+
+    return textBox;
+  }
+
+  private void addExitButton(Panel panel) {
+    panel.addComponent(new EmptySpace(new TerminalSize(0, 1)));
+
+    exitButton = new Button("Выйти", this::close);
+
+    panel.addComponent(exitButton);
+  }
+
+  private String buildCollectionText() {
+    StringBuilder text = new StringBuilder();
+
+    for (int i = 0; i < collection.size(); i++) {
+      Student student = collection.get(i);
+
+      text.append("[")
+          .append(i)
+          .append("] ")
+          .append(student == null ? "null" : student)
+          .append("\n");
+    }
+
+    return text.toString();
+  }
+}

app/src/main/java/ru/project/ui/window/CurrentCollectionWindow.java

@@ -1,41 +0,0 @@
-package ru.project.ui.window;
-
-import com.googlecode.lanterna.gui2.Button;
-import com.googlecode.lanterna.gui2.Label;
-import com.googlecode.lanterna.gui2.LinearLayout;
-import com.googlecode.lanterna.gui2.Panel;
-import com.googlecode.lanterna.gui2.WindowBasedTextGUI;
-import ru.project.collection.MyList;
-import ru.project.model.AppState;
-import ru.project.student.Student;
-import ru.project.ui.base.BaseWindow;
-
-public class CurrentCollectionWindow extends BaseWindow {
-
-  public CurrentCollectionWindow(WindowBasedTextGUI gui, AppState state) {
-    super("Текущая коллекция", gui);
-
-    Panel panel = new Panel();
-    panel.setLayoutManager(new LinearLayout());
-
-    MyList<Student> collection = state.getCollection();
-
-    if (collection == null || collection.isEmpty()) {
-      panel.addComponent(new Label("Текущая коллекция пуста."));
-    } else {
-      addStudents(panel, collection);
-    }
-
-    panel.addComponent(new Button("Выйти", this::close));
-
-    setComponent(panel);
-  }
-
-  private void addStudents(Panel panel, MyList<Student> collection) {
-    for (int i = 0; i < collection.size(); i++) {
-      Student student = collection.get(i);
-
-      panel.addComponent(new Label((i + 1) + ". " + student));
-    }
-  }
-}