Event Handling & ToogleGroup & Formatting

src/application/Main.java

@@ -3,17 +3,37 @@ package application;
 import javafx.application.Application;
 import javafx.stage.Stage;
 import javafx.scene.Scene;
+import javafx.scene.control.Alert;
+import javafx.scene.control.Alert.AlertType;
+import javafx.scene.control.ButtonType;
 
 public class Main extends Application {
-	@Override
 	public void start(Stage primaryStage) {
 		try {
 			RootFlowPane root = new RootFlowPane();
 			Scene scene = new Scene(root, 700, 500);
 			primaryStage.setScene(scene);
+			primaryStage.setTitle("GUI-Uebung 3");
 			primaryStage.show();
 		} catch (Exception e) {
-			e.printStackTrace();
+			showAlert(AlertType.ERROR, e.getMessage());
+		}
+	}
+
+	public static void showAlert(AlertType alertType, String message) {
+		if (message != null) {
+			Alert alert = new Alert(alertType, message, ButtonType.OK);
+			alert.setHeaderText(null);
+			if (alertType == AlertType.WARNING)
+				alert.setTitle("Warnung");
+			else
+				alert.setTitle("Hinweis-Meldung");
+			alert.showAndWait();
+		} else {
+			Alert alert = new Alert(alertType, "Bitte waehlen Sie \"Weiter\" aus", ButtonType.NEXT);
+			alert.setHeaderText(null);
+			alert.setTitle("Hinweis-Meldung");
+			alert.showAndWait();
 		}
 	}
 

src/application/RootFlowPane.java

@@ -1,53 +1,83 @@
 package application;
 
-import javafx.geometry.Insets;
+import javafx.application.Platform;
 import javafx.geometry.Pos;
 import javafx.scene.control.Button;
 import javafx.scene.control.CheckBox;
 import javafx.scene.control.RadioButton;
 import javafx.scene.control.ToggleGroup;
+import javafx.scene.control.Alert.AlertType;
 import javafx.scene.layout.FlowPane;
 
 public class RootFlowPane extends FlowPane {
-	private Button btOK, btBeenden;
-	private CheckBox cbWaehleMich;
+	private CheckBox cb;
 	private RadioButton rb1, rb2, rb3;
+	private Button btOk, btBeenden;
 	private ToggleGroup tgRadios;
 
 	public RootFlowPane() {
 		initComponents();
 		addComponents();
-		addHandler();
+		addHandlers();
 	}
 
 	private void initComponents() {
-		tgRadios = new ToggleGroup();
-
-		btOK = new Button("OK");
-		btBeenden = new Button("Beenden");
-
-		btOK.setPrefWidth(100);
-		btBeenden.setPrefWidth(100);
-
-		cbWaehleMich = new CheckBox("Waehle Mich!");
+		cb = new CheckBox("Waehle mich");
 
 		rb1 = new RadioButton("RB1");
 		rb2 = new RadioButton("RB2");
 		rb3 = new RadioButton("RB3");
 
-		tgRadios.getToggles().addAll(rb1, rb2, rb3);
+		tgRadios = new ToggleGroup();
+
+		btOk = new Button("OK");
+		btOk.setPrefWidth(100);
+		btBeenden = new Button("Beenden");
+		btBeenden.setPrefWidth(100);
 
-		setPadding(new Insets(10));
 		setAlignment(Pos.CENTER);
-		setVgap(10);
-		setHgap(10);
+		setHgap(20);
+		setVgap(20);
 	}
 
 	private void addComponents() {
-		getChildren().addAll(cbWaehleMich, rb1, rb2, rb3, btOK, btBeenden);
+		tgRadios.getToggles().addAll(rb1, rb2, rb3);
+		tgRadios.selectToggle(rb1);
+
+		getChildren().addAll(cb, rb1, rb2, rb3, btOk, btBeenden);
 	}
 
-	private void addHandler() {
+	private void addHandlers() {
 
+		btOk.setOnAction(event -> okClicked());
+		btBeenden.setOnAction(event -> beenden());
+
+		setOnMouseClicked(event -> flowPaneClicked()); // this = RootFlowPane -> das sind wir
+	}
+
+	// ------------------------ handlers ---------------------
+
+	private void okClicked() {
+
+		StringBuilder sb = new StringBuilder();
+		sb.append("Auswertung zu den Buttons:\n");
+		sb.append("Checkbox ist ");
+		if (!cb.isSelected())
+			sb.append(" nicht ");
+		sb.append(" selected;\n");
+
+		sb.append("Ausgewaehlter RadioButton: ");
+		RadioButton rbSelected = (RadioButton) tgRadios.getSelectedToggle();
+		sb.append(rbSelected.getText());
+
+		Main.showAlert(AlertType.INFORMATION, sb.toString());
+	}
+
+	private void beenden() {
+		Platform.exit();
+	}
+
+	private void flowPaneClicked() {
+		Main.showAlert(AlertType.WARNING, "Es wurde irgendwo ins Fenster mit der Maus geklickt");
 	}
 }