changing test functionality by intended showing now selected file

main/ui/src/main/java/org/cryptomator/ui/addvaultwizard/ChooseExistingVaultController.java

@@ -1,6 +1,8 @@
 package org.cryptomator.ui.addvaultwizard;
 
 import javafx.event.ActionEvent;
+import javafx.fxml.FXML;
+import javafx.scene.control.TextField;
 import javafx.stage.FileChooser;
 import javafx.stage.Stage;
 import org.cryptomator.ui.common.FXMLLoaderFactory;
@@ -16,6 +18,9 @@ public class ChooseExistingVaultController implements FxController {
 	private final FXMLLoaderFactory fxmlLoaders;
 	private final Stage window;
 
+	@FXML
+	public TextField textField;
+
 	@Inject
 	ChooseExistingVaultController(@AddVaultWizard Stage window, @AddVaultWizard FXMLLoaderFactory fxmlLoaders) {
 		this.window = window;
@@ -28,7 +33,7 @@ public class ChooseExistingVaultController implements FxController {
 		fileChooser.getExtensionFilters().add(new FileChooser.ExtensionFilter("Cryptomator Masterkey", "*.cryptomator"));
 		final File file = fileChooser.showOpenDialog(window);
 		if (file != null) {
-			window.setWidth(100);
+			textField.setText(file.getAbsolutePath());
 		}
 	}
 

main/ui/src/main/resources/fxml/addvault_existing.fxml

@@ -4,6 +4,7 @@
 <?import javafx.scene.control.Button?>
 <?import javafx.scene.control.Label?>
 <?import javafx.scene.layout.VBox?>
+<?import javafx.scene.control.TextField?>
 <VBox xmlns="http://javafx.com/javafx"
 	  xmlns:fx="http://javafx.com/fxml"
 	  fx:controller="org.cryptomator.ui.addvaultwizard.ChooseExistingVaultController"
@@ -15,6 +16,7 @@
 	</padding>
 	<children>
 		<Label text="Open your existing vault by choosing its masterkey file:"/>
+		<TextField fx:id="textField" text="path/to/masterkey.cryptomator" disable="true"/>
 		<Button text="file picker" onAction="#chooseFile"/>
 		<Button text="Back" onAction="#goBack"/>
 		<Button text="Open" onAction="#confirm"/>