Develop Reference

Change specific row color in javaFX

Here is the code i write to change row color where leather's meter < 200 but i face null pointer exception in if condition. First i get all data from database and add them all to table view so i don't expect null pointer exception. What is the problem?
#FXML
TableView<Leather> tableView;
ObservableList<Leather> data = FXCollections.observableArrayList();
#Override
public void initialize(URL location, ResourceBundle resources) {
tableView.setEditable(true);
codeCol.setCellValueFactory(new PropertyValueFactory<>("code"));
colorCol.setCellValueFactory(new PropertyValueFactory<>("color"));
meterCol.setCellValueFactory(new PropertyValueFactory<>("meter"));
indexCol.setCellFactory(col -> new TableCell<Task, String>() {
#Override
public void updateIndex(int index) {
super.updateIndex(index);
if (isEmpty() || index < 0) {
setText(null);
} else {
setText(Integer.toString(index+1));
}
}
});
data.addAll(storeService.getAll());
tableView.setItems(data);
tableView.setRowFactory(tv -> new TableRow<Leather>(){
#Override
protected void updateItem(Leather item, boolean empty) {
super.updateItem(item,empty);
if (item.getMeter()<200){
setStyle("-fx-background-color: #DB8A6B");
}
}
});
}

You need to handle all cases in your rowFactory (in the same way you do in your cellFactory):
tableView.setRowFactory(tv -> new TableRow<Leather>(){
#Override
protected void updateItem(Leather item, boolean empty) {
super.updateItem(item,empty);
if (empty || item == null) {
setStyle("");
} else if (item.getMeter()<200){
setStyle("-fx-background-color: #DB8A6B");
} else {
setStyle("");
}
}
});

JafaFX ListView change Color of single Cells/Items/Rows

Probably the answer to this question is very simple, so I'm going to try to keep my post so.
My Problem
I want the Text-Color of different Cells/Rows/Items to be customizable through a JavaFX ColorPicker. My Code does work, but not really like I want it to.. Everytime a new Item is added to the ListView, the whole ListView changes its Text-Color the Text-Color chosen for the latest Item.
Here's my code (Full class linked below, but I don't think it's needed)
#FXML
void handleAdd(){ //When add button is clicked
fontSize = 16.0;
listView.setCellFactory(cell -> {
ListCell<String> cel = new ListCell<String>() {
#Override
protected void updateItem(String item, boolean empty) {
super.updateItem(item, empty);
if (item != null) {
setTextFill(colorPicker.getValue());
setFont(Font.font(16));
setText(item);
} else {
setText("");
}
}
};
return cel;
});
listView.getItems().add(input.getText()); //input is my TextField
input.clear();
}
full class
Thanks in advance!

Use a item type for the ListView that contains a ObjectProperty<Color> in addition to a string
private static class ListItem {
public ListItem(String text) {
this.text = text;
}
private final String text;
private final ObjectProperty<Color> color = new SimpleObjectProperty(Color.BLACK);
}
ListView<ListItem> listView;
listView.setCellFactory(cell -> {
ListCell<ListItem> cel = new ListCell<ListItem>() {
#Override
protected void updateItem(ListItem item, boolean empty) {
super.updateItem(item, empty);
if (item != null) {
textFillProperty().bind(item.color);
setFont(Font.font(16));
setText(item.text);
} else {
setText("");
textFillProperty().unbind();
setTextFill(Color.BLACK);
}
}
};
return cel;
});
This way you simply need to set the property to a different value, if you want to change the color, e.g:
ListItem selectedItem = listView.getSelectionModel().getSelectedItem();
if (item != null) {
item.color.set(Color.RED);
}

JavaFX - Put a control (like a button) in a TableCell?

I'm trying to build custom content into a JavaFX table based on the object in the table cell. My feeling is that I can use the setCellFactory to do this, but I'm at a loss....
for instance...if I have an interface for my data:
public interface dbBase { ... }
then, each of my datatypes implement that interface
public class dbType1 implements dbBase { ... }
public class dbType2 implements dbBase { ... }
public class dbType3 implements dbBase { ... }
then, when setting up my table, I have...
dataColumn.setCellFactory(data -> {
// what should I put here?
});
dataColumn is:
TableColumn<dbBase, object> dataColumn;
So, my question is:
How can I return a custom TableViewCell based on the type of the object in the column?

I couldn't find anyway to determine the type of the class at the time of the setCellFactory call, so I decided to subclass TreeTableCell instead. That way I could change up the GUI anytime an item was updated.
So, my setCellValueFactor and setCellFactory call now looks like this:
dataColumn.setCellValueFactory(p ->
new SimpleObjectProperty<object>(p.getValue().getValue()));
dataColumn.setCellFactory(p -> new CustomTreeTableCell());
and CustomTreeTableCell() looks like this:
public class CANESTreeTableCell extends TreeTableCell<dbBase, object> {
private final Button button;
private final TextField textField;
private final CheckBox checkBox;
private ObservableValue<object> observable;
public CustomTreeTableCell() {
this.button = new Button();
this.textField = new TextField();
this.checkBox = new CheckBox();
}
#Override
public void updateItem(object item, boolean empty) {
super.updateItem(item, empty);
if(empty) {
setGraphic(null);
} else {
final TreeTableColumn<dbBase, object> column = getTableColumn();
observable = column==null ? null :
column.getCellObservableValue(getIndex());
if(item instanceof dbType1) {
if(observable != null) {
button.textProperty().bind(
observable.getValue().getNameProperty());
} else if (item!=null) {
button.setText(item.getName());
}
setGraphic(button);
} else if (item instanceof dbType2) {
if(checkBox != null) {
checkBox.textProperty().bind(
observable.getValue().getNameProperty());
} else if (item!=null) {
checkBox.setText(item.getName());
}
setGraphic(checkBox);
} else if (item instanceof dbType3) {
if(observable != null) {
textField.textProperty().bind(
observable.getValue().getNameProperty());
} else if (item!=null) {
textField.setText(item.getName());
}
setGraphic(textField);
} else {
setGraphic(null);
}
}
}
}

How to get a ComboBox to use an Object's toString method instead of setting it as a graphic? [duplicate]

I have a combobox which shows list of User objects. I have coded a custom cell factory for the combobox:
#FXML ComboBox<User> cmbUserIds;
cmbUserIds.setCellFactory(new Callback<ListView<User>,ListCell<User>>(){
#Override
public ListCell<User> call(ListView<User> l){
return new ListCell<User>(){
#Override
protected void updateItem(Useritem, boolean empty) {
super.updateItem(item, empty);
if (item == null || empty) {
setGraphic(null);
} else {
setText(item.getId()+" "+item.getName());
}
}
} ;
}
});
ListView is showing a string(id+name), but when I select an item from listview, Combobox is showing toString() method return value i.e address of object.
I can't override toString() method, because the User domain object should be same as the one at server.
How to display id in combobox? Please suggest
EDIT1
I tried below code. Now combo box shows id when I select a value from the listview.
cmbUserIds.setConverter(new StringConverter<User>() {
#Override
public String toString(User user) {
if (user== null){
return null;
} else {
return user.getId();
}
}
#Override
public User fromString(String id) {
return null;
}
});
The selected value in combo box is cleared when control focus is lost. How to fix this?
EDIT2:
#FXML AnchorPane root;
#FXML ComboBox<UserDTO> cmbUsers;
List<UserDTO> users;
public class GateInController implements Initializable {
#Override
public void initialize(URL location, ResourceBundle resources) {
users = UserService.getListOfUsers();
cmbUsers.setItems(FXCollections.observableList(users));
cmbUsers.getSelectionModel().selectFirst();
// list of values showed in combo box drop down
cmbUsers.setCellFactory(new Callback<ListView<UserDTO>,ListCell<UserDTO>>(){
#Override
public ListCell<UserDTO> call(ListView<UserDTO> l){
return new ListCell<UserDTO>(){
#Override
protected void updateItem(UserDTO item, boolean empty) {
super.updateItem(item, empty);
if (item == null || empty) {
setGraphic(null);
} else {
setText(item.getUserId()+" "+item.getUserNm());
}
}
} ;
}
});
//selected value showed in combo box
cmbUsers.setConverter(new StringConverter<UserDTO>() {
#Override
public String toString(UserDTO user) {
if (user == null){
return null;
} else {
return user.getUserId();
}
}
#Override
public UserDTO fromString(String userId) {
return null;
}
});
}
}

Just create and set a CallBack like follows:
#FXML ComboBox<User> cmbUserIds;
Callback<ListView<User>, ListCell<User>> cellFactory = new Callback<ListView<User>, ListCell<User>>() {
#Override
public ListCell<User> call(ListView<User> l) {
return new ListCell<User>() {
#Override
protected void updateItem(User item, boolean empty) {
super.updateItem(item, empty);
if (item == null || empty) {
setGraphic(null);
} else {
setText(item.getId() + " " + item.getName());
}
}
} ;
}
}
// Just set the button cell here:
cmbUserIds.setButtonCell(cellFactory.call(null));
cmbUserIds.setCellFactory(cellFactory);

You need to provide a functional fromString() Method within the Converter!
I had the same problem as you have and as I implemented the fromString() with working code, the ComboBox behaves as expected.
This class provides a few of my objects, for dev-test purposes:
public class DevCatProvider {
public static final CategoryObject c1;
public static final CategoryObject c2;
public static final CategoryObject c3;
static {
// Init objects
}
public static CategoryObject getCatForName(final String name) {
switch (name) {
case "Kategorie 1":
return c1;
case "Cat 2":
return c2;
case "Steuer":
return c3;
default:
return c1;
}
}
}
The converter object:
public class CategoryChooserConverter<T> extends StringConverter<CategoryObject> {
#Override
public CategoryObject fromString(final String catName) {
//This is the important code!
return Dev_CatProvider.getCatForName(catName);
}
#Override
public String toString(final CategoryObject categoryObject) {
if (categoryObject == null) {
return null;
}
return categoryObject.getName();
}
}

Making Table Column editable for float data types

I am sucessfull in making table column editable for those which refers to a string data type column of database table. But I am unsucessfull in doing the same with a float data type column of database table.
tblColProductID.setCellValueFactory(new PropertyValueFactory<ProductHeader, String>("Product_ID"));
tblColProductName.setCellFactory(TextFieldTableCell.forTableColumn());
tblColProductName.setOnEditCommit(new EventHandler<TableColumn.CellEditEvent<ProductHeader,String>>() {
#Override
public void handle(CellEditEvent<ProductHeader, String> t) {
// TODO Auto-generated method stub
((ProductHeader) t.getTableView().getItems()
.get(t.getTablePosition().getRow())).setProduct_ID((String) t.getNewValue());
}
The above tblColProductID refers to ProductID column which is has string datatype. But the code below gives me error in setCellFactory
tblColQuantity.setCellValueFactory(new PropertyValueFactory<PurchaseDetail, Float>("Quantity"));
tblColQuantity.setCellFactory(TextFieldTableCell.forTableColumn());
tblColQuantity.setOnEditCommit(new EventHandler<TableColumn.CellEditEvent<PurchaseDetail,Float>>() {
#Override
public void handle(CellEditEvent<PurchaseDetail, Float> t) {
((PurchaseDetail) t.getTableView().getItems().get(t.getTablePosition().getRow())).setQuantity((t.getNewValue()));
}
});
How do I make this second code work?
Thank you

Okay I have solved the problem and this is how I did it.
I refered to https://stackoverflow.com/a/27915420/5675550 which showed how to edit a table column with int datatype. I modified the code and made it work for float datatypes.
Here is the code :-
tblColQuantity.setCellFactory(col -> new IntegerEditingCell());
public class IntegerEditingCell extends TableCell<ProductHeader, Number> {
private final TextField textField = new TextField();
private final Pattern intPattern = Pattern.compile("\\d*\\.\\d+");
public IntegerEditingCell(){
textField.focusedProperty().addListener((obs, wasFocused, isNowFocused) -> {
if (! isNowFocused) {
processEdit();
}
});
textField.setOnAction(event -> processEdit());
}
private void processEdit() {
String text = textField.getText();
if (intPattern.matcher(text).matches()) {
commitEdit(Float.parseFloat(text));
} else {
cancelEdit();
}
}
#Override
public void updateItem(Number value, boolean empty) {
super.updateItem(value, empty);
if (empty) {
setText(null);
setGraphic(null);
}else if (isEditing()) {
setText(null);
textField.setText(value.toString());
setGraphic(textField);
} else {
setText(value.toString());
setGraphic(null);
}
}
#Override
public void startEdit() {
super.startEdit();
Number value = getItem();
if (value != null) {
textField.setText(value.toString());
setGraphic(textField);
setText(null);
}
}
#Override
public void cancelEdit() {
super.cancelEdit();
setText(getItem().toString());
setGraphic(null);
}
// This seems necessary to persist the edit on loss of focus; not sure why:
#Override
public void commitEdit(Number value) {
super.commitEdit(value);
((Item)this.getTableRow().getItem()).setValue(value.floatValue());
}
}