According to the sample code below Java FX Bindings seem to be non-greedy by default.
assertEquals(2,calledEffect);
does not work
but
assertEquals(2,keepBinding.get())
does.
How could I make sure the Binding is automatically activated - getting a greedy behavior?
long calledEffect=0;
private LongBinding keepBinding;
public long callMe(long value) {
calledEffect=value+1;
return calledEffect;
}
#Test
public void testBinding() {
SimpleLongProperty lp = new SimpleLongProperty();
lp.setValue(4711);
keepBinding=Bindings.createLongBinding(()->callMe(lp.get()),lp);
lp.setValue(1);
//assertEquals(2,calledEffect);
assertEquals(2,keepBinding.get());
}
Bindings are computed only when you need to get their value. If you want to invoke code whenever the value changes, use a change listener:
lp.addListener((obs, oldValue, newValue) -> callMe(newValue));
Your code then needs to be changed to:
long calledEffect=0;
private LongBinding keepBinding;
public long callMe(Number newValue) {
calledEffect=newValue.longValue()+1;
return calledEffect;
}
#Test
public void testBinding() {
SimpleLongProperty lp = new SimpleLongProperty();
lp.setValue(4711);
keepBinding=Bindings.createLongBinding(()->callMe(lp.get()),lp);
lp.addListener((obs, oldValue, newValue) -> callMe(newValue));
lp.setValue(1);
assertEquals(2,calledEffect);
assertEquals(2,keepBinding.get());
}
Related
I've created a simple TableView that is fed with data from a database, and what I want is just to be able to easily change the value of a numeric column of that table with JavaFx.
But... since I have some mental issue or something, I can't make it work.
Below it's the "SpinnerCell" component, and the issue I've been having is that even after the commitEdit is fired, when I get the items from the TableView, no values were altered. What am I missing from this update lifecycle?
import javafx.scene.control.Spinner;
import javafx.scene.control.TableCell;
public class SpinnerTableCell<S, T extends Number> extends TableCell<S, T> {
private final Spinner<T> spinner;
public SpinnerTableCell() {
this(1);
}
public SpinnerTableCell(int step) {
this.spinner = new Spinner<>(0, 100, step);
this.spinner.valueProperty().addListener((observable, oldValue, newValue) -> commitEdit(newValue));
}
#Override
protected void updateItem(T c, boolean empty) {
super.updateItem(c, empty);
if (empty || c == null) {
setText(null);
setGraphic(null);
return;
}
this.spinner.getValueFactory().setValue(c);
setGraphic(spinner);
}
}
Because your table cell is always showing the editing control (the Spinner), you bypass the usual table cell mechanism for beginning an edit. For example, in the TextFieldTableCell, if the cell is not in an editing state, then a label is shown. When the user double-clicks the cell, it enters an editing state: the cell's editingProperty() is set to true, and the enclosing TableView's editingCellProperty() is set to the position of the current cell, etc.
In your case, since this never happens, isEditing() is always false for the cell, and as a consequence, commitEdit() becomes a no-op.
Note that the CheckBoxTableCell is implemented similarly: its documentation highlights this fact. (The check box table cell implements its own direct update of properties via the selectedStateCallback.)
So there are two options here: one would be to enter an editing state when the spinner gains focus. You can do this by adding the following to the cell's constructor:
this.spinner.focusedProperty().addListener((obs, wasFocused, isNowFocused) -> {
if (isNowFocused) {
getTableView().edit(getIndex(), getTableColumn());
}
});
Another option would be to provide a callback for "direct updates". So you could do something like:
public SpinnerTableCell(BiConsumer<S,T> update, int step) {
this.spinner = new Spinner<>(0, 100, step);
this.spinner.valueProperty().addListener((observable, oldValue, newValue) ->
update.accept(getTableView().getItems().get(getIndex()), newValue));
}
and then given a model class for the table, say
public class Item {
private int value ;
public int getValue() { return value ;}
public void setValue(int value) { this.value = value ;}
// ...
}
You could do
TableView<Item> table = ... ;
TableColumn<Item, Integer> valueCol = new TableColumn<>("Value");
valueCol.setCellValueFactory(cellData -> new SimpleIntegerProperty(cellData.getValue().getValue()).asObject());
valueCol.setCellFactory(tc -> new SpinnerTableCell<>(Item::setValue, 1));
Ho can I run the change method inside ChangeListener in the initialization.
Since it only run when changes happen. For example I have a TextField that I want to set it's value to 0 when it's empty, and I do it like this:
textField.textProperty().addListener(new ChangeListener<String>() {
#Override
public void changed(ObservableValue<? extends String> observable, String oldValue, String newValue) {
if (!newValue.matches("\\d*")) {
textField.setText(newValue.replaceAll("[^\\d]", ""));
}
if (newValue.isEmpty())
textField.setText("0");
}
});
But at the start of the application the changed method is not called. So how to work around this issue?
There's no way to access a listener added to a property. Obviously you could just keep a reference to it:
ChangeListener<String> textFieldListener = (observable, oldValue, newValue) -> {
if (!newValue.matches("\\d*")) {
textField.setText(newValue.replaceAll("[^\\d]", ""));
}
if (newValue.isEmpty())
textField.setText("0");
};
textField.textProperty().addListener(textFieldListener);
textFieldListener.changed(null, null, textField.getText());
or, perhaps more naturally, just move the actual functionality to a different method:
textField.textProperty().addListener((observable, oldValue, newValue) -> vetoTextFieldChanges());
vetoTextFieldChanges();
// ...
private void vetoTextFieldChanges() {
String newText = textField.getText();
if (!newText.matches("\\d*")) {
textField.setText(newText.replaceAll("[^\\d]", ""));
}
if (newText.isEmpty())
textField.setText("0");
}
Note that the whole approach of watching for changes and then modifying them if they are inconsistent with your business logic is not very satisfactory. For example, if you have other listeners registered with the property, they may see the intermediate (invalid) values of the text. The supported way to do this is to use a TextFormatter. The TextFormatter both allows you to veto changes that are requested to the text, before the textProperty() is updated, and to convert the text to an appropriate value. So in your case you could do:
UnaryOperator<TextFormatter.Change> filter = change -> {
// remove any non-digit characters from inserted text:
if (! change.getText().matches("\\d*")) {
change.setText(change.getText().replaceAll("[^\\d]", ""));
}
// if new text is empty, replace all text with "0":
if (change.getControlNewText().isEmpty()) {
change.setRange(0, change.getControlText().length());
change.setText("0");
}
return change ;
};
TextFormatter<Integer> formatter = new TextFormatter<Integer>(new IntegerStringConverter(), 0, filter);
textField.setTextFormatter(formatter);
Now you can use the formatter to get the (numeric) values directly via the formatter's value property, and bind them to your model, etc:
// assume model is a data model and valueProperty() returns a Property<Integer>:
formatter.valueProperty().bindBidirectional(model.valueProperty());
Note that a binding like this will both update the formatter (and consequently the text field) when the model changes, and will also initialize it depending on your model value (thus providing a solution for your original question).
How do I get the resolution of the screen application (during resize) but only once the mouse has been released ?
I've looked around, but I found nothing. I've done this :
scene.widthProperty().addListener(new ChangeListener<Number>() {
#Override
public void changed(ObservableValue<? extends Number> observable, Number oldValue, Number newValue) {
ConfigBusiness.getInstance().setScreenWidth(newValue.intValue());
}
});
scene.heightProperty().addListener(new ChangeListener<Number>() {
#Override
public void changed(ObservableValue<? extends Number> observable, Number oldValue, Number newValue) {
ConfigBusiness.getInstance().setScreenHeight(newValue.intValue());
}
});
But as you expect, everytime the width / height changes, it calls the function to save the value (in my case, in the registry, which results in many calls).
Is there a way to get the value only when the mouse button has been released ? Or maybe use another kind of listener (setOnMouseDragRelease or something like that) ?
EDIT : I want the user to be able to resize the application window, and once he releases the mouse button after resizing I would like to trigger an event (and not during the whole resizing process).
Thanks
EDIT 2 : Following a bit the idea of #Tomas Bisciak, I came up with this idea.
scene.widthProperty().addListener(new ChangeListener<Number>() {
#Override
public void changed(ObservableValue<? extends Number> observable, Number oldValue, Number newValue) {
if(!widthHasChanged()){
setWidthChanged(true);
System.out.println("Width changed");
}
}
});
scene.heightProperty().addListener(new ChangeListener<Number>() {
#Override
public void changed(ObservableValue<? extends Number> observable, Number oldValue, Number newValue) {
if(!heightHasChanged()){
setHeightChanged(true);
System.out.println("Height changed");
}
}
});
scene.addEventFilter(MouseEvent.MOUSE_RELEASED, new EventHandler<MouseEvent>() {
#Override
public void handle(MouseEvent event) {
if(widthHasChanged()){
ConfigBusiness.getInstance().setScreenWidth(scene.getWidth());
System.out.println("Width changed > release");
setWidthChanged(false);
}
if(heightHasChanged()){
ConfigBusiness.getInstance().setScreenHeight(scene.getHeight());
System.out.println("Height changed > release");
setHeightChanged(false);
}
}
});
I flagged the changes done during the resizing process (with the help of widthProperty and heightProperty) and set them to true if changed, and then when releasing the mouse, I set the values if they have changed.
The problem is that the last event MOUSE_RELEASED is not triggered. I see the output from the changeListeners but not the eventFilter. Any ideas ?
Hook listener onto scene Handle mouse event anywhere with JavaFX (use MouseEvent.MOUSE_RELEASED) and on mouse release write values of the setScreenHeight/width(on every mouse release ),
if you want to only write values when drag happened with intention of resize , use boolean flag in change() "flag=true on change" methods to indicate that change has started, aferwards on mouse release just write values wherever you want and set flag to (flag=false).
If you want every time the mouse is released to get the resolution of the Monitor Screen here is the code:
Assuming you have the code for the Stage and Scene you can add a Listener for MouseReleased Event like this:
public double screenWidth ;
public double screenHeight;
.......
scene.setOnMouseReleased(m->{
screenWidth = Screen.getPrimary().getBounds().getWidth();
screenHeight = Screen.getPrimary().getBounds().getHeight();
});
......
In case you have an undecorated window that you resize it manually
when the mouse is dragged i recommend you using setOnMouseDragged();
Assuming that you are doing the above this code for moving the window
manually can be useful:
public int initialX;
public int initialY;
public double screenWidth = Screen.getPrimary().getBounds().getWidth() ;
public double screenHeight = Screen.getPrimary().getBounds().getHeight();
setOnMousePressed(m -> {
if (m.getButton() == MouseButton.PRIMARY) {
if (m.getClickCount() == 1) { // one Click
setCursor(Cursor.MOVE);
if (window.getWidth() < screenWidth ) {
initialX = (int) (window.getX() - m.getScreenX());
initialY = (int) (window.getY() - m.getScreenY());
} else
setFullScreen(false);
} else if (m.getClickCount() == 2) // two clicks
setFullScreen(true);
}
});
setOnMouseDragged(m -> {
if (window.getWidth() < screenWidth && m.getButton() == MouseButton.PRIMARY) {
window.setX(m.getScreenX() + initialX);
window.setY(m.getScreenY() + initialY);
}
});
setOnMouseReleased(m -> setCursor(Cursor.DEFAULT));
I finally found a way to accomplish "more or less" what I wanted. Here is the code for those who are looking for how to do it.
ChangeListener<Number> resizeListener = new ChangeListener<Number>() {
Timer timer = null; // used to schedule the saving task
final long delay = 200; // the delay between 2 changes
TimerTask task = null; // the task : saves resolution values
#Override
public void changed(ObservableValue<? extends Number> observable, Number oldValue, Number newValue) {
// cancels the old task as a new one has been queried
// at every change, we cancel the old task and start a new one
if(task != null) task.cancel();
// reset of the timer
if(timer == null) timer = new Timer();
task = new TimerTask() {
#Override
public void run() {
ConfigBusiness.getInstance().setScreenWidth(scene.getWidth());
ConfigBusiness.getInstance().setScreenHeight(scene.getHeight());
// stopping the timer once values are set
timer.cancel();
timer = null;
// stopping the task once values are set
task.cancel();
task = null;
}
};
timer.schedule(task, delay);
}
};
scene.widthProperty().addListener(resizeListener);
scene.heightProperty().addListener(resizeListener);
I added some comments just to help understanding the way it works. During resizing, a timer schedules a task to retrieve the width / height of the window and is started.
If another changes incomes, then the task is "reset" in order to get only the last values set.
Once the values are retrieved, it is important to clear the timer and the task, else threads will continue running.
Thanks to all who gave me hints on how to do it, hope this helps !
Nowadays I am working on raspberry pi and I write some programs in java , javafx platforms.I just would like to inform you that I am simply beginner on javafx.
According to that I just would like to trigger ENTER key after changing my textfield.Working principle of my program is like this;
1)I have created one masterform fxml and it is directing all other pages with one textfield.
2)I created main method that let me to use keyboard to enter some specific String values to assign them to textfield for page alteration.
3)I have a bridge java page, it includes global variables to use everywhere in project.So Firstly I set value from keyboard to these global variables.These global variables are created as stringproperty for adding actionlistener for any change.
4)Then I set these global variables to textfield.
5)Textfield indicates relevant values from keyboard.But Unfortunately I can not forward the pages without pressing to enter key.In this case ı would like to trigger this textfield.But unfortunately ı have no idea how to trigger texfield without pressing enter key.Therefore I decided to make auto trigger to enter key for this textfield.
I simply used robot method;
Robot robot = new Robot();
robot.keyPress(KeyEvent.VK_ENTER);
But it didn't work.Because After I set the global variable to textfield for first time.It does not define the value of the textfield is changed.It determines after pressing the enter key.
So how can I trigger this textfield after getting value of my global variables.I would like to pass how to set pages, I will show you how my program works.
Example of my code is;
Main method
public static void main(String[] args) {
Scanner scanner=new Scanner(System.in);
for (String strBarcode = scanner.nextLine(); !strBarcode.isEmpty();
strBarcode = scanner.nextLine()) {
if (strBarcode.equals("distribution")){
Global.G_MOD.set("distribution");
System.out.println(Global.G_MOD.get());
}
}}
GlobalVariables.java(bridge page)
public class Global{
public static StringProperty G_MOD = new SimpleStringProperty("");
}
My MasterController Page for javafx
public class masterformController implements Initializable {
#FXML
public TextField tbxBarcode;
#FXML
void onchangetbxBarcode(ActionEvent event) {
if(Global.G_MOD.get().equals("distribution")){
try {
FXMLLoader loader = new FXMLLoader(getClass().getResource("/puttolightfx/fxml/page1.fxml"));
Parent rootpage1 = (Parent)loader.load();
pnPages.getChildren().clear();
pnPages.getChildren().add(rootpage1);
} catch (IOException ex) {
Logger.getLogger(masterformController.class.getName()).log(Level.SEVERE, null, ex);
}
}
#Override
public void initialize(URL url, ResourceBundle rb) {
Global.G_MOD.addListener(new ChangeListener(){
#Override
public void changed(ObservableValue observable, Object oldValue, Object newValue) {
String Newvalue = (String)newValue;
tbxBarcode.setText(Global.G_MOD.get());}
});
}
}
So Everything is working, just I have to trigger textfield when the global value : Global.G_MOD is indicated on texfield.Then it will pass to another page according to global value of Global.G_MOD : "distribution".
SOLUTION(SOLVED):
I solved my problem using thread on listener of the textfield.I gave up to trigger enter key automatically and focused on textfield change.
I simply decided to use thread to change .fxml pages in textfield listener.
Platform.runLater(new Runnable() {
#Override
public void run() {
//if you change the UI, do it here !
}
});
EDITED CODE :
tbxBarcode.textProperty().addListener((ObservableValue<? extends String> observable, String oldValue, String newValue) -> {
String Newvalue=(String)newValue;
System.out.println(tbxBarcode.getText());
Platform.runLater(new Runnable() {
#Override
public void run() {
if(Global.G_MOD.get().equals("distribution")){
try {
FXMLLoader loader = new FXMLLoader(getClass().getResource("/puttolightfx/fxml/page1.fxml"));
Parent rootpage1 = (Parent)loader.load();
pnPages.getChildren().clear();
pnPages.getChildren().add(rootpage1);
} catch (IOException ex) {
Logger.getLogger(masterformController.class.getName()).log(Level.SEVERE, null, ex);
}
}
// }
}
});
});
Try using
textField.fireEvent(new KeyEvent(KeyEvent.KEY_PRESSED, "", "", KeyCode.ENTER, true, true, true, true));
According to the docs
public KeyEvent(EventType<KeyEvent> eventType,
String character,
String text,
KeyCode code,
boolean shiftDown,
boolean controlDown,
boolean altDown,
boolean metaDown)
Constructs new KeyEvent event with null source and target and KeyCode object directly specified.
Parameters:
eventType - The type of the event.
character - The character or sequence of characters associated with the event
text - A String describing the key code
code - The integer key code
shiftDown - true if shift modifier was pressed.
controlDown - true if control modifier was pressed.
altDown - true if alt modifier was pressed.
metaDown - true if meta modifier was pressed.
Since:
JavaFX 8.0
You can refer https://docs.oracle.com/javase/8/javafx/api/javafx/scene/input/KeyEvent.html
Edit 1
You need to identify the moment when Enter key event must be triggered.
For example:
If your textfield allows a limited number of characters, then you can add the above mentioned code in the following way:
txtField.textProperty().addListener(new ChangeListener<String>() {
#Override
public void changed(ObservableValue<? extends String> observable, String oldValue, String newValue) {
if (newValue.length()>30) {
txtField.setText(oldValue);
txtField.fireEvent(new KeyEvent(KeyEvent.KEY_PRESSED, "", "", KeyCode.ENTER, true, true, true, true));
}
}
});
This is just an example. It can fire your event multiple times, so you need to write the code to fire the event just once.
how can I listen to a change in the CalendarTextField in JFXtras? For example a new choosen date from the picker-menu or a typed-in date?
date.addEventFilter(MouseEvent.ANY, new EventHandler<Event>() {
#Override
public void handle(Event arg0) {
System.out.println("EVENT");
}
});
gives me every movement of the mouse within the field. I didn't find another eventType that makes sense.
I also thought about adding this event filter in the window and check the selected date at every click in the window. But that can't be the right way.
Alright, found it here:
date.valueProperty().addListener(new ChangeListener<Calendar>() {
#Override
public void changed(
ObservableValue<? extends Calendar> observableValue,
Calendar oldValue, Calendar newValue) {
System.out.println(oldValue + " -> " + newValue);
}
});
I didn't realize that in FX a listener has to be set to the property, not to the component like in Swing.
I have redesigned a calendar component in a control with FXML, for the picker-menu I use the XCalendarPicker and I add a changelistener to it calendar() (who is a property). And when a date is changed I update my textfield with the new Date
final XCalendarPicker calendarPicker = new XCalendarPicker();
final ChangeListener<Calendar> calendarListener = new ChangeListener<Calendar>() {
#Override
public void changed(ObservableValue<? extends Calendar> observable, Calendar oldValue, Calendar newValue) {
Date date = newValue.getTime();
setDate(date);
}
};
calendarPicker.calendar().addListener(calendarListener);