import javafx.application.Application;
import javafx.stage.Stage;
import javafx.scene.Scene;
import javafx.scene.layout.VBox;
import javafx.scene.layout.HBox;
import javafx.scene.control.Button;
import javafx.scene.control.TextField;
import javafx.event.EventHandler;
import javafx.event.ActionEvent;
import javafx.geometry.Pos;

public class Calculator extends Application {

	public TextField tall1= null;
	public TextField tall2 = null;
	Button knappAdd = null;
	Button knappSub = null;
	Button knappMul = null;
	Button knappDiv = null;
	public TextField svar = null;

	@Override
	public void start (Stage stage) {
		VBox rootPane = new VBox();

		tall1 = new TextField("Tall 1");
		tall2 = new TextField("Tall 2");

		knappAdd = new Button("+");
		knappSub = new Button("-");
		knappMul = new Button("*");
		knappDiv = new Button("/");

		ButtonHandler handler = new ButtonHandler();
		knappAdd.setOnAction(handler);
		knappSub.setOnAction(handler);
		knappMul.setOnAction(handler);
		knappDiv.setOnAction(handler);

		svar = new TextField("SVAR");

		HBox hbox1 = new HBox();
		hbox1.getChildren().addAll(tall1, tall2);

		HBox hbox2 = new HBox();
		hbox2.getChildren().addAll(knappAdd, knappSub, knappMul, knappDiv);

		rootPane.getChildren().addAll(hbox1, hbox2, svar);

		Scene scene = new Scene(rootPane);

		stage.setWidth(300);
		stage.setHeight(300);
		stage.setScene(scene);
		stage.setTitle("Kalkulator");
		stage.show();


	}


	class ButtonHandler implements EventHandler<ActionEvent>{

		@Override public void handle (ActionEvent e) {


            Button denne = (Button) e.getSource();
			int svarTall = 0;

			if (denne == knappAdd){
				int en = Integer.parseInt(tall1.getText());
				int to = Integer.parseInt(tall2.getText());
				svarTall = en + to;
			}
			else if (denne == knappSub){
				int en = Integer.parseInt(tall1.getText());
				int to = Integer.parseInt(tall2.getText());
				svarTall = en - to;
			}
			else if (denne == knappMul){
				int en = Integer.parseInt(tall1.getText());
				int to = Integer.parseInt(tall2.getText());
				svarTall = en * to;
			}
			else if (denne == knappDiv){
				int en = Integer.parseInt(tall1.getText());
				int to = Integer.parseInt(tall2.getText());
				try {
					svarTall = en / to;
				}
				catch(Exception f){}
			}

			svar.setText(""+svarTall);
		}
	}
}