simple dialog without cancel button

src/main/java/org/cryptomator/ui/dialogs/SimpleDialog.java

@@ -31,8 +31,9 @@ public class SimpleDialog {
 		FxmlLoaderFactory loaderFactory = FxmlLoaderFactory.forController( //
 				new SimpleDialogController(resolveText(builder.messageKey, null), //
 						resolveText(builder.descriptionKey, null), //
-						builder.icon, resolveText(builder.okButtonKey, null), //
-						resolveText(builder.cancelButtonKey, null), //
+						builder.icon, //
+						resolveText(builder.okButtonKey, null), //
+						builder.cancelButtonKey != null ? resolveText(builder.cancelButtonKey, null) : null, //
 						() -> builder.okAction.accept(dialogStage), //
 						() -> builder.cancelAction.accept(dialogStage)), //
 				Scene::new, builder.resourceBundle);
@@ -67,7 +68,6 @@ public class SimpleDialog {
 		private String descriptionKey;
 		private String okButtonKey;
 		private String cancelButtonKey;
-
 		private FontAwesome5Icon icon;
 		private Consumer<Stage> okAction = Stage::close;
 		private Consumer<Stage> cancelAction = Stage::close;
@@ -128,7 +128,6 @@ public class SimpleDialog {
 			Objects.requireNonNull(messageKey, "SimpleDialog messageKey must be set.");
 			Objects.requireNonNull(descriptionKey, "SimpleDialog descriptionKey must be set.");
 			Objects.requireNonNull(okButtonKey, "SimpleDialog okButtonKey must be set.");
-			Objects.requireNonNull(cancelButtonKey, "SimpleDialog cancelButtonKey must be set.");
 
 			try {
 				return new SimpleDialog(this);

src/main/java/org/cryptomator/ui/dialogs/SimpleDialogController.java

@@ -3,6 +3,8 @@ package org.cryptomator.ui.dialogs;
 import org.cryptomator.ui.common.FxController;
 import org.cryptomator.ui.controls.FontAwesome5Icon;
 
+import javafx.beans.property.BooleanProperty;
+import javafx.beans.property.SimpleBooleanProperty;
 import javafx.fxml.FXML;
 
 public class SimpleDialogController implements FxController {
@@ -14,6 +16,7 @@ public class SimpleDialogController implements FxController {
 	private final String cancelButtonText;
 	private final Runnable okAction;
 	private final Runnable cancelAction;
+	private final BooleanProperty dismissed = new SimpleBooleanProperty();
 
 	public SimpleDialogController(String message, String description, FontAwesome5Icon icon, String okButtonText, String cancelButtonText, Runnable okAction, Runnable cancelAction) {
 		this.message = message;
@@ -24,6 +27,10 @@ public class SimpleDialogController implements FxController {
 		this.okAction = okAction;
 		this.cancelAction = cancelAction;
 	}
+	
+	public void initialize() {
+		dismissed.set(cancelButtonText == null || cancelButtonText.isEmpty());
+	}
 
 	public String getMessage() {
 		return message;
@@ -45,6 +52,11 @@ public class SimpleDialogController implements FxController {
 		return cancelButtonText;
 	}
 
+	@FXML
+	public boolean getDismissed() {
+		return dismissed.get();
+	}
+
 	@FXML
 	private void handleOk() {
 		if (okAction != null) {

src/main/resources/fxml/simple_dialog.fxml

@@ -41,7 +41,7 @@
 			<Region VBox.vgrow="ALWAYS" minHeight="18"/>
 			<ButtonBar buttonMinWidth="120" buttonOrder="+CI">
 				<buttons>
-					<Button text="${controller.cancelButtonText}" ButtonBar.buttonData="CANCEL_CLOSE" cancelButton="true" onAction="#handleCancel"/>
+					<Button text="${controller.cancelButtonText}" ButtonBar.buttonData="CANCEL_CLOSE" cancelButton="true" onAction="#handleCancel" visible="${controller.dismissed}" managed="${controller.dismissed}"/>
 					<Button text="${controller.okButtonText}" ButtonBar.buttonData="FINISH" defaultButton="true" onAction="#handleOk"/>
 				</buttons>
 			</ButtonBar>