Aufgabe 4 ausgeführt.

code/FXML-Calculator/src/main/java/ch/zhaw/prog2/fxmlcalculator/IsObservable.java

@@ -0,0 +1,18 @@
+package ch.zhaw.prog2.fxmlcalculator;
+/**
+ * Most basic interface for observing an object
+ * @author bles
+ *
+ */
+public interface IsObservable {
+	/**
+	 * Add an observer that listens for updates
+	 * @param observer
+	 */
+	void addListener(IsObserver observer);
+	/**
+	 * Remove an observer from the list
+	 * @param observer
+	 */
+	void removeListener(IsObserver observer);
+}

code/FXML-Calculator/src/main/java/ch/zhaw/prog2/fxmlcalculator/IsObserver.java

@@ -0,0 +1,13 @@
+package ch.zhaw.prog2.fxmlcalculator;
+/**
+ * Most basic interface for beeing an observer
+ * @author bles
+ *
+ */
+public interface IsObserver {
+	/**
+	 * This method is always called when an observed object
+	 * changes
+	 */
+	void update();
+}

code/FXML-Calculator/src/main/java/ch/zhaw/prog2/fxmlcalculator/Main.java

@@ -5,6 +5,9 @@ import javafx.fxml.FXMLLoader;
 import javafx.scene.Scene;
 import javafx.scene.layout.Pane;
 import javafx.stage.Stage;
+
+import java.io.IOException;
+
 /**
  * Main-Application. Opens the first window (MainWindow) and the common ValueHandler
  * @author
@@ -14,10 +17,21 @@ public class Main extends Application {
 
     private ValueHandler valueHandler;
 
+    private static final String INFO = """
+        Enter valid values to
+        - Initial amount (> 0)
+        - Return in % (can be +/- or 0)
+        - Annual Costs (> 0)
+        - Number of years (> 0)
+        Calculate displays the annual balance development!";
+        """;
+
 	public static void main(String[] args) {
 		launch(args);
 	}
 
+
+
 	@Override
 	public void start(Stage primaryStage) {
 		valueHandler = new ValueHandler();
@@ -27,16 +41,17 @@ public class Main extends Application {
 	private void mainWindow(Stage primaryStage) {
 		//load main window
         try {
-            FXMLLoader loader = new FXMLLoader(getClass().getResource("MainWindow.fxml"));
-
-            Pane rootNode = loader.load();
-
-            MainWindowController mainWindowController = loader.getController();
 
 
-            Scene scene = new Scene(rootNode);
+            FXMLLoader mainWindowLoader = new FXMLLoader(getClass().getResource("MainWindow.fxml"));
+            Pane rootNode = mainWindowLoader.load();
 
-            primaryStage.setScene(scene);
+            MainWindowController mainWindowController = mainWindowLoader.getController();
+            mainWindowController.setValueHandler(new ValueHandler());
+            mainWindowController.setHelpText(INFO);
+            Scene mainWindowScene = new Scene(rootNode);
+
+            primaryStage.setScene(mainWindowScene);
             primaryStage.show();
         } catch(Exception e) {
             e.printStackTrace();

code/FXML-Calculator/src/main/java/ch/zhaw/prog2/fxmlcalculator/MainWindowController.java

@@ -1,24 +1,27 @@
 package ch.zhaw.prog2.fxmlcalculator;
 
-
+import javafx.application.Platform;
+import javafx.event.ActionEvent;
+import javafx.fxml.FXML;
+import javafx.fxml.FXMLLoader;
 import javafx.scene.Scene;
 import javafx.scene.control.CheckMenuItem;
+import javafx.scene.control.Label;
 import javafx.scene.control.TextArea;
 import javafx.scene.control.TextField;
 import javafx.scene.layout.*;
 import javafx.scene.paint.Color;
 import javafx.stage.Stage;
-import javafx.event.ActionEvent;
+import javafx.scene.Scene;
-import javafx.fxml.FXML;
+
+import javax.xml.transform.Result;
+import java.io.IOException;
 
-/**
- * Controller for the MainWindow. One controller per mask (or FXML file)
- * Contains everything the controller has to reach in the view (controls)
- * and all methods the view calls based on events.
- * @author
- * @version 1.0
- */
 public class MainWindowController {
+    ValueHandlerDecorator valueHandlerDecorator;
+    ValueHandler valueHandler;
+    String helpText;
+
     @FXML
     private TextField annualCost;
 
@@ -48,12 +51,79 @@ public class MainWindowController {
 
     @FXML
     void calculate(ActionEvent event) {
+        valueHandlerDecorator.checkValuesAndCalculateResult(initialAmount.getText(), returnInPercent.getText(), annualCost.getText(), numberOfYears.getText());
+    }
 
+    @FXML
+    void clearResults(ActionEvent event) {
+        valueHandlerDecorator.clearResult();
+    }
+
+
+    @FXML
+    void clearValues(ActionEvent event) {
+        if(clearAnnualCosts.isSelected()){
+            annualCost.clear();
+        }
+        if(clearReturnInPercent.isSelected()){
+            returnInPercent.clear();
+        }
+        if(clearNumberOfYears.isSelected()){
+            numberOfYears.clear();
+        }
+        if(clearInitialAmount.isSelected()){
+            initialAmount.clear();
+        }
     }
 
     @FXML
     void close(ActionEvent event) {
+        Platform.exit();
+    }
 
+    @FXML
+    void openResultWindow(ActionEvent event) {
+
+        FXMLLoader resultWindowLoader = new FXMLLoader(getClass().getResource("ResultWindow.fxml"));
+        Pane resultNode = new StackPane();
+        try {
+            resultNode = resultWindowLoader.load();
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+        ResultWindowController resultWindowController = resultWindowLoader.getController();
+        resultWindowController.setValueHandler(valueHandler, valueHandlerDecorator);
+        Scene resultScene = new Scene(resultNode);
+
+        // New window (Stage)
+        Stage resultStage = new Stage();
+        resultStage.setTitle("Results");
+        resultStage.setScene(resultScene);
+
+        resultStage.show();
+
+        valueHandlerDecorator.informListener();
+    }
+
+
+    @FXML
+    void showHelp(ActionEvent event) {
+        valueHandlerDecorator.showHelp(helpText);
+    }
+
+    public void setValueHandler(ValueHandler valueHandler){
+        this.valueHandler = valueHandler;
+        valueHandlerDecorator = new ValueHandlerDecorator(valueHandler);
+        valueHandlerDecorator.addListener(new IsObserver() {
+            @Override
+            public void update() {
+                results.setText(valueHandler.getResultBound());
+            }
+        });
+    }
+
+    public void setHelpText(String helpText){
+        this.helpText = helpText;
     }
 
 }

code/FXML-Calculator/src/main/java/ch/zhaw/prog2/fxmlcalculator/ResultWindowController.java

@@ -1,5 +1,6 @@
 package ch.zhaw.prog2.fxmlcalculator;
 
+import javafx.fxml.FXML;
 import javafx.scene.control.TextArea;
 import javafx.stage.Stage;
 
@@ -11,15 +12,26 @@ import javafx.stage.Stage;
  * @version 1.0
  */
 public class ResultWindowController {
-    // add datafields
+    ValueHandler valueHandler;
+    ValueHandlerDecorator valueHandlerDecorator;
 
-	//@FXML
+	@FXML
     private TextArea results;
 
-	//@FXML
+	@FXML
 	private void closeWindow() {
 		Stage stage = (Stage) results.getScene().getWindow();
 		stage.close();
 	}
 
+    public void setValueHandler(ValueHandler valueHandler, ValueHandlerDecorator valueHandlerDecorator){
+        this.valueHandler = valueHandler;
+        valueHandlerDecorator.addListener(new IsObserver() {
+            @Override
+            public void update() {
+                results.setText(valueHandler.getResultBound());
+            }
+        });
+    }
+
 }

code/FXML-Calculator/src/main/java/ch/zhaw/prog2/fxmlcalculator/ValueHandlerDecorator.java

@@ -0,0 +1,60 @@
+package ch.zhaw.prog2.fxmlcalculator;
+
+import ch.zhaw.prog2.fxmlcalculator.IsObservable;
+import ch.zhaw.prog2.fxmlcalculator.IsObserver;
+import ch.zhaw.prog2.fxmlcalculator.ValueHandler;
+import javafx.fxml.FXMLLoader;
+import javafx.scene.Scene;
+import javafx.scene.layout.Pane;
+import javafx.scene.layout.StackPane;
+import javafx.stage.Stage;
+
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.List;
+/**
+ * Adds observable functionality to one Value Handler.
+ * The decorator uses the original methods of the WordModel-object.
+ * @author bles
+ *
+ */
+public class ValueHandlerDecorator implements IsObservable {
+    private final ValueHandler valueHandler;
+    private List<IsObserver> listener = new ArrayList<>();
+
+    public ValueHandlerDecorator(ValueHandler valueHandler) {
+        this.valueHandler = valueHandler;
+    }
+
+    @Override
+    public void addListener(IsObserver observer) {
+        listener.add(observer);
+    }
+
+    @Override
+    public void removeListener(IsObserver observer) {
+        listener.remove(observer);
+    }
+
+    public void checkValuesAndCalculateResult(String initialAmount, String returnInPercent, String annualCost, String numberOfYears) {
+        valueHandler.checkValuesAndCalculateResult(initialAmount, returnInPercent, annualCost, numberOfYears);
+        informListener();
+    }
+
+    public void showHelp(String text) {
+        valueHandler.setResultBound(text);
+        informListener();
+    }
+
+    public void clearResult(){
+        valueHandler.clearResult();
+        informListener();
+    }
+
+    public void informListener() {
+        for(IsObserver observer : listener) {
+            observer.update();
+        }
+    }
+
+}

code/FXML-Calculator/src/main/resources/ch/zhaw/prog2/fxmlcalculator/MainWindow.fxml

@@ -10,6 +10,7 @@
 <?import javafx.scene.control.SeparatorMenuItem?>
 <?import javafx.scene.control.TextArea?>
 <?import javafx.scene.control.TextField?>
+<?import javafx.scene.input.KeyCodeCombination?>
 <?import javafx.scene.layout.BorderPane?>
 <?import javafx.scene.layout.ColumnConstraints?>
 <?import javafx.scene.layout.GridPane?>
@@ -17,7 +18,7 @@
 <?import javafx.scene.layout.RowConstraints?>
 <?import javafx.scene.layout.VBox?>
 
-<BorderPane prefHeight="400.0" prefWidth="300.0" xmlns="http://javafx.com/javafx/17" xmlns:fx="http://javafx.com/fxml/1" fx:controller="ch.zhaw.prog2.fxmlcalculator.MainWindowController">
+<BorderPane prefHeight="400.0" prefWidth="400.0" xmlns="http://javafx.com/javafx/17" xmlns:fx="http://javafx.com/fxml/1" fx:controller="ch.zhaw.prog2.fxmlcalculator.MainWindowController">
    <top>
       <MenuBar BorderPane.alignment="CENTER">
          <menus>
@@ -28,14 +29,17 @@
                   <CheckMenuItem fx:id="clearAnnualCosts" mnemonicParsing="false" text="Annual Cost" />
                   <CheckMenuItem fx:id="clearNumberOfYears" mnemonicParsing="false" text="Number of years" />
                   <SeparatorMenuItem mnemonicParsing="false" />
-                  <MenuItem mnemonicParsing="false" text="Clear values" />
+                  <MenuItem mnemonicParsing="false" onAction="#clearValues" text="Clear values" />
                   <SeparatorMenuItem mnemonicParsing="false" />
-                  <MenuItem mnemonicParsing="false" text="Clear results" />
+                  <MenuItem mnemonicParsing="false" onAction="#clearResults" text="Clear results" />
                </items>
             </Menu>
             <Menu mnemonicParsing="false" text="?">
                <items>
-                  <MenuItem mnemonicParsing="false" text="Show help F1" />
+                  <MenuItem mnemonicParsing="false" onAction="#showHelp" text="Show help F1">
+                     <accelerator>
+                        <KeyCodeCombination alt="ANY" code="F1" control="ANY" meta="ANY" shift="ANY" shortcut="ANY" />
+                     </accelerator></MenuItem>
                </items>
             </Menu>
          </menus>
@@ -97,6 +101,11 @@
                   <Insets bottom="5.0" left="10.0" right="10.0" top="5.0" />
                </HBox.margin>
             </Button>
+            <Button mnemonicParsing="false" onAction="#openResultWindow" text="Open result window">
+               <HBox.margin>
+                  <Insets bottom="5.0" left="10.0" right="10.0" top="5.0" />
+               </HBox.margin>
+            </Button>
          </children>
          <BorderPane.margin>
             <Insets />

code/FXML-Calculator/src/main/resources/ch/zhaw/prog2/fxmlcalculator/ResultWindow.fxml

@@ -4,12 +4,12 @@
 <?import javafx.scene.control.Button?>
 <?import javafx.scene.control.Label?>
 <?import javafx.scene.control.TextArea?>
-<?import javafx.scene.layout.*?>
+<?import javafx.scene.layout.BorderPane?>
+<?import javafx.scene.layout.HBox?>
+<?import javafx.scene.layout.VBox?>
 <?import javafx.scene.text.Font?>
 
-<BorderPane maxHeight="-Infinity" maxWidth="-Infinity" minHeight="250.0" minWidth="400.0" prefHeight="250.0" prefWidth="400.0"
+<BorderPane maxHeight="-Infinity" maxWidth="-Infinity" minHeight="250.0" minWidth="400.0" prefHeight="250.0" prefWidth="400.0" xmlns="http://javafx.com/javafx/17" xmlns:fx="http://javafx.com/fxml/1" fx:controller="ch.zhaw.prog2.fxmlcalculator.ResultWindowController">
-            xmlns="http://javafx.com/javafx/11.0.1" xmlns:fx="http://javafx.com/fxml/1"
-            fx:controller="ch.zhaw.prog2.fxmlcalculator.ResultWindowController">
    <center>
       <VBox minWidth="300.0" BorderPane.alignment="TOP_CENTER">
          <children>
@@ -35,7 +35,7 @@
    <bottom>
       <HBox alignment="BOTTOM_RIGHT" BorderPane.alignment="CENTER">
          <children>
-            <Button fx:id="closeForm" mnemonicParsing="false" onMouseClicked="#closeWindow" text="Close">
+            <Button fx:id="closeForm" mnemonicParsing="false" onAction="#closeWindow" text="Close">
                <HBox.margin>
                   <Insets bottom="5.0" left="5.0" right="5.0" top="5.0" />
                </HBox.margin>