I have 3 fields:
#FXML
private TextField name;
#FXML
private TextField lastName;
#FXML
private TextField phoneNumber;
I created for them EventHandler:
EventHandler<InputEvent> fieldChangeListener = new EventHandler<InputEvent>() {
public void handle(InputEvent event) {
String input = ((TextField) event.getSource()).getText();
System.out.println("Changed: "+event.getSource());
event.consume();
}
};
And assigned to them:
name.addEventHandler(InputMethodEvent.INPUT_METHOD_TEXT_CHANGED, fieldChangeListener);
lastName.addEventHandler(InputMethodEvent.INPUT_METHOD_TEXT_CHANGED, fieldChangeListener);
phoneNumber.addEventHandler(InputMethodEvent.INPUT_METHOD_TEXT_CHANGED, fieldChangeListener);
How can I determine which one of my 3 fields triggered event?
I want to call different functions depending on which one of those was changed, like:-
if(name){
function changedName();
}
else if(lastName){
function changedLastName();
}
else if(phoneNumber){
function changedPhoneNumber();
}
Instead of setting one event handler on all of them, create 3 different handlers
EventHandler<InputEvent> nameChangedHandler = (event) -> changedName();
EventHandler<InputEvent> lastNameChangedHandler = (event) -> changedLastName();
EventHandler<InputEvent> phoneNumberChangedHandler = (event) -> changedPhoneNumber();
and then then add them to their respective TextFields. If you are using a single event handler because there is common code at the start and end, then simply refactor those into separate functions and call them in all the event handlers.
If you still need an explicit check then use
Object source = event.getSource();
if(source == name) {
changedName();
} else if(source == lastName) {
changedLastName();
} else if(source == phoneNumber) {
changedPhoneNumber();
}
TextField input = ((TextField) event.getSource());
input.getId();
Related
I would like to validate if a textfield is empty or not using javafx.
I am confused of event handlers. I want to confirm :
- whether there are many ways to use setOnAction :
submit.setOnAction((new EventHandler<MouseEvent>() {
public void handle(MouseEvent event) {
System.out.println("Hello World");
}
}));
or
submit.setOnAction(e -> handle(e));
what is the difference between these two choices?
whether the second choice can not use the ActionEvent
submit.setOnAction(e -> handle());
but then what is the purpose of defining e?
I would like to validate textfields in my application.
public class AppGUI extends Application{
public static void main(String[] args)
{
launch();
}
public void start(Stage topView)
{
createUI(topView);
}
private void createUI(Stage topView)
{
TextField name = TextField();
Button submit = new Button("Submit");
submit.setOnAction(e -> validate());
}
private boolean validate()
{
// if textfield is empty, return false. else, return true.
}
I am lost here. Is it okay if the e in setOnAction is not used in validate? How do I pass the value of textfield to validate()? is making the textfields private variables the only way? (because I have so many text fields I wonder if its a good option).
in createUI method, how do i say if validate() returns false, show error message and if true, do something else?
Thank you and sorry for bothering
what is the difference between these two choices?
In second option lambdas are used (appeared since Java 8)
but then what is the purpose of defining e?
For a button your method have a signature like this setOnAction(EventHandler<ActionEvent> handler) You should see EventHandler tutorials and an ActionEvent javadoc. For instance, from e you can get the object on which the Event initially occurred this way e.getSource()
It is ok if you don't use e in validate.
To pass the value of textfield your method should have signature like this
boolean validate(String text);
Code example:
private void createUI(Stage topView){
TextField name = TextField();
Button submit = new Button("Submit");
submit.setOnAction(e -> {
boolean validated = validate(name.getText());
if(validated) System.out.println("validated");
}
}
private boolean validate(String text){
return text != null && !text.isEmpty();
}
I want draw path between two imageview same as picture
.
this path start from one of these imageview by mouse press, continue by mouse press and move event on pane and must be end in another imageview by mouse press.here is the problem after first mouse press didn't recieve any mouse press event on imageviews, the event just recieves on the pane becuase of that draw line didn't stop. what is wrong in my code ?
here's my controller code :
public class DrawLine {
#FXML
ImageView imageView1 ;
#FXML
ImageView imageView2 ;
#FXML
AnchorPane pane ;
private Line currentLine ;
private String state ;
private DoubleProperty mouseX = new SimpleDoubleProperty();
private DoubleProperty mouseY = new SimpleDoubleProperty();
#FXML
private void initialize(){
state = "dfkl" ;
imageView1.setPreserveRatio( false);
imageView2.setPreserveRatio( false);
imageView1.setOnMousePressed( event -> {
imageMousePress( event);
});
imageView2.setOnMousePressed( event -> {
imageMousePress( event);
});
pane.setOnMousePressed( event -> {
paneMousePress( event) ;
});
imageView2.setPickOnBounds(false);
imageView1.setPickOnBounds(false);
pane.setOnMouseMoved( event -> {
paneMouseMove( event);
});
}
public void paneMouseMove( MouseEvent e) {
if( this.state.equals("DRAWLINE") && this.currentLine != null) {
makeLine( e);
}
}
public void paneMousePress( MouseEvent e) {
if( this.state.equals("DRAWLINE") && this.currentLine != null) {
endLine(e);
startLine(e);
}
}
private void startLine( MouseEvent e ){
currentLine = new Line();
currentLine.setStyle( "-fx-stroke: #a86a6a ; -fx-stroke-width: 5");
currentLine.setStartX( e.getSceneX());
currentLine.setStartY(e.getSceneY());
mouseX.set( e.getSceneX()) ;
mouseY.set( e.getSceneY());
currentLine.endXProperty().bind(mouseX);
currentLine.endYProperty().bind(mouseY);
pane.getChildren().add(currentLine);
}
private void endLine ( MouseEvent e){
currentLine.endXProperty().unbind();
currentLine.endYProperty().unbind();
currentLine.setEndX(e.getX());
currentLine.setEndY(e.getY());
currentLine = null;
}
private void makeLine( MouseEvent e){
mouseX.set(e.getX());
mouseY.set(e.getY());
}
private void imageMousePress( MouseEvent event){
if( currentLine == null){
startLine(event);
state = "DRAWLINE" ;
}else if( currentLine != null & state.equals("DRAWLINE")){
endLine( event);
}
}
}
help me please.
When dragging the end point of the line around, the end is positioned below the mouse cursor. This way the target of the mouse event is the Line, not the ImageView and since there is no event handler for the event for the Line that consumes it, the event is delivered to the parent of the Line which is the AnchorPane, not the ImageView.
To fix this set the mouseTransparent property of the Line to true:
private void startLine(MouseEvent e) {
currentLine = new Line();
currentLine.setMouseTransparent(true);
...
}
Also you should consume the events for the ImageViews to not trigger the event handler for the AnchorPane too:
imageView1.setOnMousePressed(event -> {
imageMousePress(event);
event.consume();
});
imageView2.setOnMousePressed(event -> {
imageMousePress(event);
event.consume();
});
Also note that x and y properties of the MouseEvent are relative to the coordinate system of the Node where the handler is added.
private void endLine(MouseEvent e) {
currentLine.endXProperty().unbind();
currentLine.endYProperty().unbind();
currentLine.setEndX(e.getX());
currentLine.setEndY(e.getY());
currentLine = null;
}
needs to be changed to
private void endLine(MouseEvent e) {
currentLine.endXProperty().unbind();
currentLine.endYProperty().unbind();
currentLine = null;
}
Furthermore if there are a limited number of states, I recommend using a enum instead since this way you get compile time checks for typos. Using strings for this purpose you could accidentally add bugs, e.g. if you accidentally use "DRAWLlNE" instead of "DRAWLINE" which can be hard to spot. Additionally enum constants can be compared using ==.
private enum States {
DRAWLINE
}
I want to bind the disable of a button with dynamically created checkboxes. The Button should be enabled if a checkbox is selected.
This is my code
public class DietTabPageController {
#FXML
private FlowPane parent;
#FXML
private Button okButton;
private ObservableList<CheckBox> checkBoxes=FXCollections.observableArrayList();
#FXML
private void initialize() {
ObservableList<Diet> diets = DietDAO.getDiets();
diets.forEach(diet -> checkBoxes.add(new CheckBox(diet.getName())));
//checkboxes added in parent Flowpane
parent.getChildren().addAll(checkBoxes);
}
}
Any suggestions? Thanks
You can use JavaFX's really nice Bindings-class!
Try this:
okButton.disableProperty().bind(
Bindings.createBooleanBinding(
()->!checkBoxes.stream().anyMatch(CheckBox::isSelected),
checkBoxes.stream().map(x->x.selectedProperty()).toArray(Observable[]::new)
)
);
This creates a new Binding, which will listen on every checkbox and then call the given function to calculate the value of your property.
Additional reading here: Bindings
Regarding your comment:
I don't know how much you can edit your Diet class, but if you can, there is a very simple way to display your checkboxes and add the button-binding. Take a look at the following sample:
ListView<Diet> dietsView = new ListView<>(diets);
dietsView.setCellFactory(CheckBoxListCell.forListView(diet ->
diet.selectedProperty()));
btn.disableProperty().bind(
Bindings.createBooleanBinding(
() -> !diets.stream().anyMatch(diet->diet.isSelected()),
diets.stream().map(x->x.selectedProperty())
.toArray(Observable[]::new)
)
);
add this to Diet class:
private final BooleanProperty selected = new SimpleBooleanProperty();
public final BooleanProperty selectedProperty() {
return this.selected;
}
public final boolean isSelected() {
return this.selectedProperty().get();
}
public final void setSelected(final boolean on) {
this.selectedProperty().set(on);
}
You need to add listeners to all the selected properties of the CheckBoxes. Every time one of the property changes, modify the Button's disable property, if necessary. BTW: Making checkBoxes observable doesn't seem necessary:
private List<CheckBox> checkBoxes;
#FXML
private void initialize() {
ObservableList<Diet> diets = DietDAO.getDiets();
checkBoxes = new ArrayList<>(diets.size());
ChangeListener<Boolean> listener = (o, oldValue, newValue) -> {
if (newValue) {
// activate button since at least one CheckBox is selected
okButton.setDisable(false);
} else {
// disable button, if the last CheckBox was unselected
for (CheckBox cb : checkBoxes) {
if (cb.isSelected()) {
return; // don't do anything, if there still is a selected CheckBox
}
}
okButton.setDisable(true);
}
};
for (Diet diet : diets) {
CheckBox cb = new CheckBox(diet.getName());
cb.selectedProperty().addListener(listener);
checkBoxes.add(cb);
}
//checkboxes added in parent Flowpane
parent.getChildren().addAll(checkBoxes);
}
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.
Ok if i have the following code:
protected void makebutton(String name){
JButton button = new JButton(name);
mypanel.add(button);
}
then:
makebutton("Button1");
makebutton("Button2");
makebutton("Button3");
How can i add ActionListener to them. Which name do I use for ActionListener, tried many combination but no success.
What you could do is make the method return a Button. Thats way you can use the button variable else where in your program. What's happening in your case is that the button is encapsulated. so you can't access from anywhere else in your code. Something like this
private JButton makeButton(String name){
JButton button = new JButton(name);
button.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
// code action to perform
}
});
return button;
}
You can use the method when you declare the button
JButton aButton = makeButton();
panel.add(aButton);
The more reasonable way to do it is just create the buttons without a method.
JButtton button = new JButton("Button");
panel.add(button);
button.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
// code action to perform
}
});
I don't really see the need for a method.
Another option is to create a custom listener class
public class GUI {
JButton button1;
JButton button2;
public GUI(){
button1 = new JButton();
button2 = new JButton();
button1.addActionListner(new ButtonListener());
button2.addActionListner(new ButtonListener());
}
private class ButtonListener implements ActionListener{
public void actionPerformed(ActionEvent e){
if (e.getSource() == button1){
// do something
} else if (e.getSource() == button2){
// something
}
}
}
}
protected void makebutton(String name){
final String n = name;
JButton button = new JButton(name);
mypanel.add(button);
button.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
if(n=="Button1"){
button1ActionListener();
}else if(n=="Button2"){
button2ActionListener();
}
}
});
}
you have to create more methods for every button.
I think peeskillet's second code is the good one.