ScrollBar within custom Alert box not working JavaFX - javafx

Question

Is there an easy way to put a scroll bar in an Alert box and have it actually scroll? I'm adding a grid pane to the scroll pane. While the Alert box is active, I'm adding and removing content as the user requests. Unfortunately, there is a limit to ho much I can add because the Alert box grows beyond the screen height. Hence the reason for a scroll pane. The problem is, it doesn't seem to think it needs to scroll even though the content is below the screen
I've tried a bunch of things, but each time the scroll bars grow with the scroll pane. I even tried a custom ScrollPane as suggested by James_D. Still not luck.
Any help would be awesome!
Here is the code for the custom Alert box
import java.util.ArrayList;
import java.util.List;
import com.sun.xml.internal.bind.v2.runtime.unmarshaller.XmlVisitor.TextPredictor;
import javafx.application.Platform;
import javafx.beans.value.ChangeListener;
import javafx.beans.value.ObservableValue;
import javafx.collections.ObservableList;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.geometry.Bounds;
import javafx.geometry.Insets;
import javafx.scene.Node;
import javafx.scene.control.Alert;
import javafx.scene.control.Button;
import javafx.scene.control.DialogPane;
import javafx.scene.control.Label;
import javafx.scene.control.ScrollPane;
import javafx.scene.control.ScrollPane.ScrollBarPolicy;
import javafx.scene.control.TextField;
import javafx.scene.layout.GridPane;
import javafx.scene.layout.Region;
import javafx.scene.layout.VBox;
import javafx.scene.text.Font;
import javafx.scene.text.FontWeight;
import javafx.scene.text.Text;
public class SettingsChangeWindow extends Alert {
public enum SETTING_TYPE {SINGLE, MULTIPLE};
private SETTING_TYPE type = null;
private IndexedGridPane parentGrid;
private SettingBean bean;
private DialogPane parentPane;
public SettingsChangeWindow(SettingBean bean) {
super(AlertType.CONFIRMATION);
this.bean = bean;
this.type = bean.getType();
SizeableScrollPane scroll = new SizeableScrollPane();
scroll.setHbarPolicy(ScrollBarPolicy.ALWAYS);
scroll.setVbarPolicy(ScrollBarPolicy.ALWAYS);
scroll.setFitToHeight(true);
scroll.setFitToWidth(true);
parentGrid = new IndexedGridPane();
scroll.setContent(parentGrid);
this.parentPane = getDialogPane();
setResizable(true);
if(type == SETTING_TYPE.SINGLE){
FriendlyVBox vbox = new FriendlyVBox();
setTitle("Change " + bean.getName());
setHeaderText("Change the " + bean.getName() + " value by changing the value in the box");
parentGrid.setPadding(new Insets(20, 150, 0, 10));
vbox.getChildren().addAll(new Label(bean.getName()), new AutoTextBox(bean.getValue()));
parentGrid.add(vbox, 0, 0);
}else{
setTitle("Change " + bean.getName());
String header = "Change the " + bean.getName() + " value by changing the value in the box\n";
header += "You may add and delete value sets (may require resizing)";
setHeaderText(header);
parentGrid.add(new AddButton(), 1, 0);
parentGrid.add(new RemoveButton(), 2, 0);
addMultipleValues();
}
this.parentPane.setContent(scroll);
// parentPane.setMinHeight(GridPane.USE_PREF_SIZE);
// parentPane.setMinWidth(GridPane.USE_PREF_SIZE);
// getDialogPane().getChildren().stream().forEach(node -> ((Label)node).setMinHeight(Region.USE_PREF_SIZE));
}
public SettingBean getValue(){
return bean;
}
private void addMultipleValues(){
List<Object> values = bean.getChildren();
if(bean.getName().equals("TSPAddressPostal") || bean.getName().equals("SchemeOperatorAddressPostal")){
for(Object addr : values){
PhysicalAddressBean address = (PhysicalAddressBean)addr;
addPhysicalAddress(address);
}
}else{
for(Object uri : values){
addURI((String)uri);
}
}
}
public void saveValue(){
if(type == SETTING_TYPE.SINGLE){
List<Node> children = parentGrid.getChildren();
for(Node child : children){
if(child instanceof FriendlyVBox){
// cast to FriendlyVBox
String value = ((FriendlyVBox)child).getTextField().getText();
this.bean.setValue(value);
}
}
}else{
saveMultipleValues();
}
}
/**
* For values in XML that can have multiple child nodes
*/
private void saveMultipleValues(){
switch(bean.getName()){
case "TSPAddressPostal" :
savePostalAddress();
break;
case "SchemeOperatorAddressPostal":
savePostalAddress();
break;
default:
saveURI();
break;
}
}
/**
* If the setting bean is encapsulating a list of physical address
* (when the name is: PostalAddress) populate via predefined structure
*/
private void savePostalAddress(){
List<Object> addresses = new ArrayList<>();
List<Node> children = parentGrid.getChildren();
for(Node child : children){
if(child instanceof IndexedGridPane){
IndexedGridPane pane = (IndexedGridPane) child;
PhysicalAddressBean add = new PhysicalAddressBean();
// each address attribute in the order listed in Trust List XML
add.setStreetAddress(((FriendlyVBox)pane.get(0, 1)).getTextField().getText());
add.setLocality(((FriendlyVBox)pane.get(0, 2)).getTextField().getText());
add.setPostalCode(((FriendlyVBox)pane.get(0, 3)).getTextField().getText());
add.setCountryName(((FriendlyVBox)pane.get(0, 4)).getTextField().getText());
// add address bean to list
addresses.add(add);
}
}
bean.setChildren(addresses);
}
/**
* used to store any values in the XML that can have multiple child URI values
*/
private void saveURI(){
List<Object> uris = new ArrayList<>();
List<Node> children = parentGrid.getChildren();
for(Node child : children){
if(child instanceof FriendlyVBox){
FriendlyVBox vBox = (FriendlyVBox) child;
uris.add(vBox.getTextField().getText());
}
}
bean.setChildren(uris);
}
private void addURI(String uri){
int newSlot = parentGrid.getRowCount();
FriendlyVBox vBox = new FriendlyVBox();
vBox.getChildren().addAll(new Label("\n" + bean.getName()), new AutoTextBox(""));
parentGrid.add(vBox, 0, newSlot);
}
private void addPhysicalAddress(){
int newSlot = parentGrid.getRowCount();
IndexedGridPane pane = new IndexedGridPane();
Label label = new Label("\nPostal Address");
pane.add(label, 0, 0);
label.setFont(Font.font("system", FontWeight.BOLD, 12));
FriendlyVBox postal = new FriendlyVBox();
postal.getChildren().addAll(new Label("Street Address"), new AutoTextBox(""));
FriendlyVBox local = new FriendlyVBox();
local.getChildren().addAll(new Label("Locale"), new AutoTextBox(""));
FriendlyVBox postalCode = new FriendlyVBox();
postalCode.getChildren().addAll(new Label("Postal Code"), new AutoTextBox(""));
FriendlyVBox country = new FriendlyVBox();
country.getChildren().addAll(new Label("Country Name"), new AutoTextBox(""));
pane.add(postal, 0, 1);
pane.add(local, 0, 2);
pane.add(postalCode, 0, 3);
pane.add(country, 0, 4);
parentGrid.add(pane, 0, newSlot);
}
private void addPhysicalAddress(PhysicalAddressBean address){
int newSlot = parentGrid.getRowCount();
IndexedGridPane pane = new IndexedGridPane();
Label label = new Label("\nPostal Address");
pane.add(label, 0, 0);
label.setFont(Font.font("system", FontWeight.BOLD, 12));
FriendlyVBox street = new FriendlyVBox();
street.getChildren().addAll(new Label("Street Address"), new AutoTextBox(address.getStreetAddress()));
FriendlyVBox local = new FriendlyVBox();
local.getChildren().addAll(new Label("Locale"), new AutoTextBox(address.getLocality()));
FriendlyVBox postalCode = new FriendlyVBox();
postalCode.getChildren().addAll(new Label("Postal Code"), new AutoTextBox(address.getPostalCode()));
FriendlyVBox country = new FriendlyVBox();
country.getChildren().addAll(new Label("Country Name"), new AutoTextBox(address.getCountryName()));
pane.add(street, 0, 1);
pane.add(local, 0, 2);
pane.add(postalCode, 0, 3);
pane.add(country, 0, 4);
parentGrid.add(pane, 0, newSlot);
}
private class IndexedGridPane extends GridPane{
public Node get(final int row, final int column) {
Node result = null;
ObservableList<Node> childrens = super.getChildren();
for (Node node : childrens) {
if(super.getRowIndex(node) == row && super.getColumnIndex(node) == column) {
result = node;
break;
}
}
return result;
}
public int getRowCount() {
int numRows = getRowConstraints().size();
for (int i = 0; i < getChildren().size(); i++) {
Node child = getChildren().get(i);
if (child.isManaged()) {
Integer rowIndex = GridPane.getRowIndex(child);
if(rowIndex != null){
numRows = Math.max(numRows,rowIndex+1);
}
}
}
return numRows;
}
}
private class AutoTextBox extends TextField{
public AutoTextBox(String contents){
setMinWidth(Region.USE_PREF_SIZE);
setMaxWidth(Region.USE_PREF_SIZE);
textProperty().addListener(new AutoAdjustText());
setText(contents);
}
private class AutoAdjustText implements ChangeListener<String>{
#Override
public void changed(ObservableValue<? extends String> ov,
String prevText, String currText) {
Platform.runLater(() -> {
Text text = new Text(currText);
text.setFont(getFont()); // Set the same font, so the size is the same
double width = text.getLayoutBounds().getWidth() // This big is the Text in the TextField
+ getPadding().getLeft() + getPadding().getRight() // Add the padding of the TextField
+ 2d; // Add some spacing
setPrefWidth(width); // Set the width
positionCaret(getCaretPosition()); // If you remove this line, it flashes a little bit
});
}
}
}
private class FriendlyVBox extends VBox{
public TextField getTextField(){
List<Node> children = getChildren();
for(Node child : children){
if(child instanceof TextField){
return (TextField)child;
}
}
return null;
}
}
private class AddButton extends Button{
public AddButton(){
setText("Add+");
onActionProperty().set(new AddValue());
}
private class AddValue implements EventHandler<ActionEvent>{
#Override
public void handle(ActionEvent event) {
if(bean.getName().equals("TSPAddressPostal") || bean.getName().equals("SchemeOperatorAddressPostal")){
addPhysicalAddress();
}else{
addURI("Add URI here");
// parentPane.setContent(parentGrid);
}
parentPane.getScene().getWindow().sizeToScene();
}
}
}
private class RemoveButton extends Button{
public RemoveButton(){
setText("Remove");
onActionProperty().set(new RemoveValue());
}
private class RemoveValue implements EventHandler<ActionEvent>{
#Override
public void handle(ActionEvent event) {
int rowCount = parentGrid.getRowCount();
parentGrid.getChildren().remove(rowCount);
parentPane.getScene().getWindow().sizeToScene();
}
}
}
private class SizeableScrollPane extends ScrollPane{
public SizeableScrollPane() {
viewportBoundsProperty().addListener(new Resizer());
hvalueProperty().addListener(new Resizer());
vvalueProperty().addListener(new Resizer());
}
private class Resizer implements ChangeListener<Object> {
#Override
public void changed(ObservableValue<? extends Object> observable, Object oldValue, Object newValue) {
double hmin = getHmin();
double hmax = getHmax();
double hvalue = getHvalue();
double contentWidth = getContent().getLayoutBounds().getWidth();
double viewportWidth = getViewportBounds().getWidth();
double hoffset =
Math.max(0, contentWidth - viewportWidth) * (hvalue - hmin) / (hmax - hmin);
double vmin = getVmin();
double vmax = getVmax();
double vvalue = getVvalue();
double contentHeight = getContent().getLayoutBounds().getHeight();
double viewportHeight = getViewportBounds().getHeight();
double voffset =
Math.max(0, contentHeight - viewportHeight) * (vvalue - vmin) / (vmax - vmin);
System.out.printf("Offset: [%.1f, %.1f] width: %.1f height: %.1f %n",
hoffset, voffset, viewportWidth, viewportHeight);
}
}
}
}

Answer 1

I feel stupid.
if you comment out the lines in the constructor:
scroll.setHbarPolicy(ScrollBarPolicy.ALWAYS);
scroll.setVbarPolicy(ScrollBarPolicy.ALWAYS);
scroll.setFitToHeight(true);
scroll.setFitToWidth(true);
And you comment out the lines in the button listeners:
parentPane.getScene().getWindow().sizeToScene();
All is good in the world. You don't even need a custom ScrollPane, it works as expected. I hope this helps someone else