I would like to create menu with 3 radio buttons(comm,med,all). Where for example Comm button should create hbox, but when the other option is selected, this hbox should disapear, but it wont.
Could anyone set me to the right direction?
Thank you a lot.
Heres what Ive got:
comm.setOnAction(new EventHandler<ActionEvent>() {
#Override public void handle(ActionEvent e) {
if(comm.isSelected())
root.add(commBox, 0,1);
else if(med.isSelected()||all.isSelected())
root.getChildren().remove(commBox);
}
});
The onAction handler for the radio button is invoked when an action is performed on that button. The radio button will become deselected when one of the other buttons in the same toggle group is selected. So your handler does not get invoked when the button is deselected.
Register a listener with the selectedProperty instead:
comm.selectedProperty().addListener((obs, wasSelected, isNowSelected) -> {
if (isNowSelected) {
root.add(commBox, 0,1);
} else {
root.getChildren().remove(commBox);
}
});
Alternatively, you could register a listener with the toggle group:
// assuming the following existing code, or its equivalent:
ToggleGroup toggleGroup = new ToggleGroup();
comm.setToggleGroup(toggleGroup);
med.setToggleGroup(toggleGroup);
all.setToggleGroup(toggleGroup);
// then this will work:
toggleGroup.selectedToggleProperty().addListener((obs, oldToggle, newToggle) -> {
if (newToggle == comm) {
root.add(commBox, 0, 1);
} else {
root.getChildren().remove(commBox);
}
// maybe more logic here to handle med or all selected...
});
Related
My controller class has a moveButton method that on button click moves the button to a new location. This works fine and is called by a number of buttons which do the same thing. I want to add a key listener so when a button has been clicked once, until a different button is clicked, the user can use the up arrow to move the button (ie call the same moveButton function). The below is how I have tried to implement it, I also tried putting the key listener in the initialize method but neither seem to be working. Any advice would be greatly appreciated!
public void moveButton(ActionEvent actionEvent) {
Button buttonPressed = (Button) actionEvent.getSource();
double newAnchor = getNewAnchor(AnchorPane.getBottomAnchor(buttonPressed)) // separate method that returns new anchor location
AnchorPane.setBottomAnchor(buttonPressed, newAnchor);
buttonPressed.getScene().setOnKeyPressed(new EventHandler<KeyEvent>() {
#Override
public void handle(KeyEvent event) {
if(event.getCode() == KeyCode.UP){
moveButton(actionEvent);
}
}
});
}
Don't treat the events like data that you need to pass around. Use them as triggers to do work. Generally, don't write generic event handlers that are called from multiple events and multiple nodes. Write short event handlers that just call methods to do something, and pass them the minimum from the event that they need to do the job.
If you do this, then it changes your thinking about how all of this stuff works and then it's just plain old Java, with no magic. And it's simple:
public class MoveButton extends Application {
private Node activeButton;
private Pane pane;
#Override
public void start(Stage primaryStage) throws Exception {
pane = new Pane();
Scene scene = new Scene(pane, 1200, 800);
primaryStage.setScene(scene);
primaryStage.show();
Button button1 = new Button("Button 1");
Button button2 = new Button("Button 2");
button2.setTranslateX(80);
button1.setOnAction(evt -> buttonClick(button1));
button2.setOnAction(evt -> buttonClick(button2));
pane.getChildren().addAll(button1, button2);
pane.setOnKeyPressed(evt -> moveButton(evt.getCode()));
}
private void moveButton(KeyCode keyCode) {
switch (keyCode) {
case UP -> activeButton.setTranslateY(activeButton.getTranslateY() - 30);
case RIGHT -> activeButton.setTranslateX(activeButton.getTranslateX() + 30);
case DOWN -> activeButton.setTranslateY(activeButton.getTranslateY() + 30);
case LEFT -> activeButton.setTranslateX(activeButton.getTranslateX() - 30);
}
}
private void buttonClick(Node button) {
activeButton = button;
pane.requestFocus();
}
}
JavaFX does not execute events like the ActionEvent for Button or CheckBox, if a modifier key like CTRL or SHIFT is pressed. As far as I understand this behavior is implemented in ButtonBehavior (e.g. note the expression ! keyDown in the following method from that class):
#Override public void mouseReleased(MouseEvent e) {
// if armed by a mouse press instead of key press, then fire!
final ButtonBase button = getControl();
if (! keyDown && button.isArmed()) {
button.fire();
button.disarm();
}
}
First of all, I do not really understand the reason for this. What is the purpose of not firing a button if a key is pressed?
This is my use-case: I want to implement a checkbox that can be checked/unchecked as normal. It will toggle some state in a model. But it should have an additional feature: if the user presses some key like CTRL while checking/unchecking with the mouse, an additional flag called "locked" or "protected" should be set in the model, which will prevent that the state can be overwritten by some other logic of the application.
This should give an idea about the use-case, but if not it doesn't really matter for my actual question: How can I make it possible that a CheckBox can still be toggled (or a Button be pressed) even though the user presses a modifier key?
Thanks for your help!
That is odd you can implement it yourself like so
public class Main extends Application {
#Override
public void start(Stage primaryStage) throws Exception{
VBox vBox = new VBox();
vBox.setAlignment(Pos.CENTER);
CheckBox checkBox = new CheckBox();
checkBox.setOnMouseClicked(event -> {
if(event.isControlDown()) {
System.out.print("Control down click ");
checkBox.setSelected(!checkBox.isSelected());
}
else
System.out.print("Normal click ");
System.out.println("Checked Status:"+checkBox.isSelected());
});
Button button = new Button("Button");
button.setOnMouseClicked(event -> {
if(event.isControlDown())
System.out.println("Control down click");
else
System.out.println("Normal click");
});
vBox.getChildren().addAll(new Label("Click the box"),checkBox,button);
primaryStage.setScene(new Scene(vBox));
primaryStage.show();
}
public static void main(String[] args) { launch(args); }
}
The output for CheckBox:
Normal click Checked Status:true
Normal click Checked Status:false
Control down click Checked Status:true
Control down click Checked Status:false
The output for Button:
Normal click
Control down click
I created listview in my application and its item has a delete button:
public Cell() {
super();
this.delete = new Button("delete");
// I have also image and other labels in this cell
this.hBox.getChildren().addAll(productImage, amountLabel, priceLabel, delete);
HBox.setHgrow(pane, Priority.ALWAYS);
delete.setOnAction(event -> getListView().getItems().remove(getItem()));
}
But in my main controller window when I click this button amount field and amountLabel must be changed which are my main controller class:
#FXML
void addToShopCart(ActionEvent event) {
selectedPart.setAmount(amount);
selectedPart.setSumma(amount*selectedPart.getPrice());
shopListView.getItems().add(selectedPart);
summa += amount*selectedPart.getPrice();
totalPriceLabel.setText(summa + "$");
} // this is when I add an item to the list
Now I don't know how to subtract amount from summa that was added. For this I tried return button like this:
Cell cell;
#FXML
void initialize() {
cell = new Cell();
shopListView.setCellFactory(param -> cell));
Button button = cell.getDeleteButton();
button.setOnAction(...//some action)
}
But it doesn't help. I tried to cut the code.
I am working on a javafx Minesweeper game, and currently am only using left mouse button input. I would like to use the right mouse button also so users can flag possible bombs. I looked at the Oracle webpage for Button class, and it says:
"When a button is pressed and released a ActionEvent is sent. Your application can perform some action based on this event by implementing an EventHandler to process the ActionEvent. Buttons can also respond to mouse events by implementing an EventHandler to process the MouseEvent."
https://docs.oracle.com/javafx/2/api/javafx/scene/control/Button.html
Ive tried this several different ways, with no success.
Included is my current EventHandler code. If anyone can explain the best way to handle right/left mouse clicks, or point me in the right direction of where to find that information, it is greatly appreciated.
MineButton is a custom class that extends Button. I would like on right click to mark as "m" and change cell color, and left click would remain the same.
for (int row = 0; row < 8; row++){
for (int col = 0; col <8; col++){
MineButton button = new MineButton(row, col);
button.setPrefSize(100, 100);
button.setText("?");
button.setStyle("-fx-font: 22 arial; -fx-base:#dcdcdc;");
button.setOnAction(new EventHandler<ActionEvent>() {
#Override
public void handle(ActionEvent event) {
if ( button.isAMine() == true){
button.setText("B");
for( int row1 = 0; row1 < 8; row1++){
for ( int col1 = 0; col1 < 8; col1++){
if (mineButtons[row1][col1].isAMine() == true){
mineButtons[row1][col1].setText("B");
mineButtons[row1][col1].setStyle("-fx- font: 22 arial; -fx-base: #dc143c;");
}
}
}
}
else{
recursion(mineButtons, button.getX(), button.getY());
}
}
});
You cannot handle right clicks on a button by attaching an event handler on action event. Instead you need to add a handler to the mouse event:
button.setOnMouseClicked(new EventHandler<MouseEvent>() {
#Override
public void handle(MouseEvent mouseEvent) {
if(mouseEvent.getButton().equals(MouseButton.SECONDARY)){
System.out.println("Set flag on the button");
}
}
});
If u wanna handle the MouseEvent use this code. It will work.
button.addEventFilter(MouseEvent.MOUSE_CLICKED, new EventHandler<MouseEvent>() {
#Override
public void handle(MouseEvent event) {
if(event.getButton() == MouseButton.SECONDARY){
// Type code to set flag here
}
}
});
scene.setOnMousePressed(event ->{
if(event.getButton() == MouseButton.PRIMARY) {
anchorX = event.getSceneX();
anchorY = event.getSceneY();
anchorAngleX = angleX.get();
anchorAngleY = angleY.get();
}
});
scene.setOnMouseDragged((MouseEvent event) -> {
if(event.getButton() == MouseButton.PRIMARY) {
angleX.set(anchorAngleX - (anchorY - event.getSceneY()));
angleY.set(anchorAngleY - (anchorX - event.getSceneX()));
}
});
This code rotates a JavaFX group in a scene with a left mouse button and a drag. You can print the event.getButton to make certain your primary and secondary are working. I have tried many other ways including JavaFXtras. This is by far the simplest way to handle the primary and secondary mouse click events.
A JavaFX MenuItem can respond to most KeyPress events by setting an ActionEvent EventHandler. However, while the event handler does catch a KeyPress of KeyCode.ENTER, it does not catch a KeyCode.TAB KeyPress event. Apparently, some key events like TAB are handled at a deeper level. For example, the arrow keys enable traversal of the menu.
My ContextMenu is a list of completions of an email address string the user has started typing in a TextField. The users want to press the arrow keys to select the desired item, and the TAB key to execute the completion.
I can attach an event handler to the ContextMenu itself and catch the TAB keypress. But the event's Source is then the ContextMenu, and I can find no variables in the ContextMenu indicating which MenuItem was highlighted when the TAB key was pressed. MenuItem allows css style to control appearance of the menu item in focus, but it does not have any properties telling whether it is in focus or not.
I have tried futzing with the EventDispatchChain via MenuItem buildEventDispatchChain() to no avail. There seems to be no way to intercept the TAB KeyPress or otherwise determine which menu item was in focus when the TAB key was pressed.
Any suggestions?
If I get this right, you want to override the default keypressed listener to add your own response, so for that we have to find where it's applied.
To get this working, we've got to get our hands dirty with private API...
ContextMenu skin (ContextMenuSkin) uses a ContextMenuContent object, as a container with all the items. Each of these items are also in a ContextMenuContent.MenuItemContainer container.
We can override the keypressed listener on the parent container, while we can add a focusedProperty listener to the items on the items container.
Using this private API
import com.sun.javafx.scene.control.skin.ContextMenuContent;
this is working for me:
private ContextMenuContent.MenuItemContainer itemSelected=null;
#Override
public void start(Stage primaryStage) {
MenuItem cmItem1 = new MenuItem("Item 1");
cmItem1.setOnAction(e->System.out.println("Item 1"));
MenuItem cmItem2 = new MenuItem("Item 2");
cmItem2.setOnAction(e->System.out.println("Item 2"));
final ContextMenu cm = new ContextMenu(cmItem1,cmItem2);
Scene scene = new Scene(new StackPane(), 300, 250);
scene.setOnMouseClicked(t -> {
if(t.getButton()==MouseButton.SECONDARY || t.isControlDown()){
cm.show(scene.getWindow(),t.getScreenX(),t.getScreenY());
ContextMenuContent cmc= (ContextMenuContent)cm.getSkin().getNode();
cmc.setOnKeyPressed(ke->{
switch (ke.getCode()) {
case UP: break;
case DOWN: break;
case TAB: ke.consume();
if(itemSelected!=null){
itemSelected.getItem().fire();
}
cm.hide();
break;
default: break;
}
});
VBox itemsContainer = cmc.getItemsContainer();
itemsContainer.getChildren().forEach(n->{
ContextMenuContent.MenuItemContainer item=(ContextMenuContent.MenuItemContainer)n;
item.focusedProperty().addListener((obs,b,b1)->{
if(b1){
itemSelected=item;
}
});
});
}
});
primaryStage.setScene(scene);
primaryStage.show();
}
Excellent! Thank you #jose! I ended up writing somewhat different code but
the key is using com.sun.javafx.scene.control.skin.ContextMenuContent, which provides
access to the ContextMenuContent.MenuItemContainer objects that hold the MenuItems.
In order to not break the existing UP/DOWN key behavior, I added a new handler
to the ContextMenuContent object; this handler only consumes the TAB KeyPress and
everthing else passes through to their normal handlers.
Looking at the ContextMenuContent class, I borrowed their existing method for
finding the focused item, so didn't have to add focusedProperty listeners.
Also, I'm on Java 1.7 and don't have lambdas and I use a very basic programming style.
public class MenuItemHandler_CMC <T extends Event> implements EventHandler {
public ContextMenuContent m_cmc;
public AddressCompletionMenuItemHandler_CMC(ContextMenuContent cmc){
m_cmc = cmc;
}
#Override
public void handle(Event event){
KeyEvent ke = (KeyEvent)event;
switch(ke.getCode()){
case TAB:
ke.consume();
MenuItem focused_menu_item = findFocusedMenuItem();
if(focused_menu_item != null){
focused_menu_item.fire();
}
break;
default: break;
}
}
public MenuItem findFocusedMenuItem() {
VBox items_container = m_cmc.getItemsContainer();
for (int i = 0; i < items_container.getChildren().size(); i++) {
Node n = items_container.getChildren().get(i);
if (n.isFocused()) {
ContextMenuContent.MenuItemContainer menu_item_container = (ContextMenuContent.MenuItemContainer)n;
MenuItem menu_item = menu_item_container.getItem();
return menu_item;
}
}
return null;
}
}
...Attach the additional handler
if(m_context_menu.getSkin() != null){
ContextMenuContent cmc = (ContextMenuContent)m_context_menu.getSkin().getNode();
MenuItemHandler_CMC menu_item_handler_cmc = new MenuItemHandler_CMC(cmc);
cmc.addEventHandler(KeyEvent.KEY_PRESSED, menu_item_handler_cmc);
}