I tried a few methods:
tabPane.getSelectionModel().selectedItemProperty().addListener((e, o, n)
if (tabPane.getTabs().isEmpty()) someButton.setDisable(false);
and this when creating the tab:
tab.setOnCloseRequest(e ->
if (tabPane.getTabs().isEmpty()) someButton.setDisable(false);
But both are not working. The second method is definitly wrong as it is checking if there are tabs before actually closing the tab. Any solutions? Many thanks
Create isNotEmpty BooleanBinding on TabPane ObservableList<Tab>.
TabPane tp = new TabPane(new Tab("A"),new Tab("B"));
final BooleanBinding empty = Bindings.isNotEmpty(tp.getTabs());
Button someButton = new Button();
someButton.disableProperty().bind(empty);
I'm not sure if the below is what you want, but you can check that the size of the matched tab list in the tabpane <= 1 rather than empty.
tab.setOnCloseRequest(event -> {
TabPane tabPane = tab.getTabPane();
if (tabPane.getTabs().size() <= 1) {
// don't allow the last tab to be closed.
event.consume();
return;
}
});
Consuming the close request will prevent closure, but you could do other work in that event as well or instead (such as manipulating the disable property of your button) if you wish.
Usually button disable properties are well controlled via a binding, so perhaps something like MBec's solution might be a good idea in that case if that is all you need to accomplish.
Related
Essentially, what I'm trying to do is something like to a text-based RPG using JavaFX. Right now, to display some text, I've got this:
final IntegerProperty i = new SimpleIntegerProperty(0);
Timeline timeline = new Timeline();
KeyFrame keyFrame = new KeyFrame(
Duration.millis(70),
event -> {
if (i.get() > info.getText().length()) {
timeline.stop();
} else {
text.setText(info.getText().substring(0, i.get()));
i.set(i.get() + 1);
}
});
timeline.getKeyFrames().add(keyFrame);
timeline.setCycleCount(Animation.INDEFINITE);
timeline.play();
timeline.setOnFinished(a -> {
hb_start.getChildren().clear();
hb_start.getChildren().addAll(start_left,start_right);
hb_start.setAlignment(Pos.CENTER);
});
Because the length of the animation depends on the size of the text, the cyclecount is set to indefinite. Unless there's some other way I'm missing to make the animation play once and then stop, I'd like it so that when you press enter (or some other key that I decide on later) for it to call timeline.stop(); but I can't figure out how to add any sort of listener. Trying to implement keyListenerseems to come with all sorts of stuff that I don't need, and it also doesn't work with a TextField, and instead wants a JTextField, which might be fine, except that I don't have a clue how to do anything with Swing.
Currently, the text is being displayed in aTextFlow from the text of Text. I'm assuming the listener would be added to the TextFlow, or even the scene itself, honestly, I'm at a loss for what to do. It sounds simple, but I can't seem to figure it out.
KeyListener is a AWT class, not a JavaFX class. Unless you're embedding a Swing component in your JavaFX application or a JavaFX node in a Swing application, you should use JavaFX's equivalent EventHandler<KeyEvent> instead. Furthermore there is no need to include a TextField (or Swing's JTextField) in your application just for the sake of receiving key events. You could add the listener directly to the Scene:
final KeyCode stopKey = KeyCode.ENTER;
EventHandler<KeyEvent> handler = event -> {
if (event.getCode() == stopKey) {
timeline.stop();
}
};
scene.setOnKeyPressed(handler);
Note that events can be consumed by nodes before they reach the scene, e.g. by a TextField that has the focus. In this case you could make sure you get the event by registering a the listener as a event filter instead:
// scene.setOnKeyPressed(handler);
scene.addEventFilter(KeyEvent.KEY_PRESSED, handler);
In order to use a TableView (with resizable columns) as drag source,
I have attached an onDragDetected handler on that TableView with the effect, that resizing TableColumns does not work anymore: If the user clicks into the TableHeaderRow for dragging the column separators, these mouse events are consumed by my handler too.
The handler is attached to the whole TableView and I do not see a way to distinguish between events from TableRows and events from the TableHeaderRow.
Attaching the handler to the data-rows only is not appropriate in my case, since I need multiline selection (and do not want to have dependencies from the RowFactory to the application data model).
Any suggestions?
best Hans
I found the solution myself: I had to look up the TableHeaderRow instance with the lookup-method, and discard the DRAG_DETECTED event there.
Pane header = (Pane) mainTableView.lookup("TableHeaderRow");
header.setOnDragDetected(new EventHandler<MouseEvent>() {
public void handle(MouseEvent event) {
System.out.println("ignoring drag operation from table header.");
event.consume();
}
});
After that, resising of table columns works. Maybe there is something wrong with my drag+drop event handling that initially caused the problem!? Somebody voted down without comment...
The solution by Hans does work, but only after the window is shown. I added a window.setOnShown((WindowEvent e) listener and then I was able to do the lookup and header.setOnDragDetected.
Here is how I added it:
window.setOnShown((WindowEvent e) -> {
Pane header = (Pane) mainTableView.lookup("TableHeaderRow");
....
});
Otherwise, lookup returns null.
I want to have a TreeView that has all of its children permanently expanded, and I don't want the user to be able to expand or collapse any of the children.
To do this I've found that I need to do the following:
Remove icon with CSS (Done)
Change expand and collapse image TreeView JavaFX 2.2
[edit] Above link should be used to change image; to remove completely, use this solution: https://stackoverflow.com/a/27831191/4430591
Remove double click functionality (Done)
Disable TreeItem's default expand/collapse on double click JavaFX 2.2
[edit] Remove ability to collapse / expand using keyboard arrrow keys (Done)
Given in José Pereda's solution below ( https://stackoverflow.com/a/27831085/4430591 )
[edit] Remove ability to right click for a ContextMenu (Done)
Given in José Pereda's solution below ( https://stackoverflow.com/a/27831085/4430591 )
Remove icon's clickablity (How do I do this?)
[edit] solution: https://stackoverflow.com/a/27831191/4430591
Even though the icon is no longer visible, it's still clickable. I don't see any way of filtering this; I only see ways to be able to respond to it after the fact.
Also, if I'm missing anything else that I need to do to ensure this functionality, please let me know.
I feel quite silly. I think this was mostly just a matter of not knowing what that darn arrow was called. Apparently it's a disclosureNode? Maybe that's common knowledge.
In the custom defined TreeCell, all I did was add this line in the updateItem method:
setDisclosureNode(null);
The solution to avoid modifying the skin or the default behavior is more simple if we trap the clicks before they are dispatched, and consume the right ones.
For that we can use an EventDispatcher, to filter both the mouse pressed and the right click over the arrows, which are StackPane nodes:
class CellEventDispatcher implements EventDispatcher {
private final EventDispatcher original;
public CellEventDispatcher(EventDispatcher original) {
this.original = original;
}
#Override
public Event dispatchEvent(Event event, EventDispatchChain tail) {
if (event.getEventType().equals(MouseEvent.MOUSE_PRESSED) ||
event.getEventType().equals(ContextMenuEvent.ANY)){
event.consume();
}
if(event instanceof KeyEvent && event.getEventType().equals(KeyEvent.KEY_PRESSED)){
if((((KeyEvent)event).getCode().equals(KeyCode.LEFT) ||
((KeyEvent)event).getCode().equals(KeyCode.RIGHT))){
event.consume();
}
}
return original.dispatchEvent(event, tail);
}
}
Now we apply our custom dispatcher to the tree view:
#Override
public void start(Stage primaryStage) {
TreeView<String> tree = new TreeView<>();
...
EventDispatcher treeOriginal = tree.getEventDispatcher();
tree.setEventDispatcher(new CellEventDispatcher(treeOriginal));
Scene scene = new Scene(tree);
primaryStage.setScene(scene);
primaryStage.show();
}
This will consume any click (left or right) over the arrows on the tree.
EDIT
Added to the event dispatcher class the case where the user uses the keyboard to traverse the tree view, consuming the collapse/expand events with arrow LEFT or RIGHT.
I'm using ControlsFX's CheckComboBox and want to listen for open and close events of the menu. Is there a way to do that?
I need this, to commit the done changes when the users closes the menu / leaves the field. In TextFields I do this when the user hits Enter, which doesn't seem appropriate using this control. Alternatively, I could try working with focusedProperty in some way.
I used
// Commit only when box closes
checkComboBox.addEventHandler(ComboBox.ON_HIDDEN, event -> {
System.out.println("CheckComboBox is now hidden.");
});
Seemed pretty clean.
Old question but may help someone. Original source came from: https://bitbucket.org/controlsfx/controlsfx/issues/462/checkcombobox-ignores-prefwidth-maybe-any by Olivier Vanrumbeke
To reach the combobox from CheckComboBox, try this if the skin is not null:
CheckComboBoxSkin skin = (CheckComboBoxSkin)checkComboBox.getSkin();
ComboBox combo = (ComboBox)skin.getChildren().get(0);
combo.showingProperty().addListener((obs, hidden, showing) -> {
if(hidden) performTaskWhenPopUpCloses();});
And if it's not set yet (skin is null), try this (ugly workaround):
private final ChangeListener<Skin> skinListener = (skinObs, oldVal, newVal) -> {
if (oldVal == null && newVal != null) {
CheckComboBoxSkin skin = (CheckComboBoxSkin) newVal;
ComboBox combo = (ComboBox) skin.getChildren().get(0);
combo.showingProperty().addListener((obs, hidden, showing) -> {
if(hidden)
performTaskWhenPopUpCloses();
});
}
};
checkComboBox.skinProperty().addListener(skinListener);
(version 8.40.9)
Problem:
Have tabPane tabs OK.
In the first tab there is a text field. I am able to get focus on this field when starting the application.
After changing the tabs and coming back to the first tab I want focus to be on this textfield (barcodereader should be active in this field) without having to select the field with the mouse.
I am able to catch event from tabs with
tp.getSelectionModel().selectedItemProperty().addListener(new ChangeListener<Tab>()
{ etc
(could not post with code)
and I am able to trigger en event for the first tab.
But field.requestFocus(); does not work. Probably because this method comes before rendering the textfield.
So here is my question:
How do you set focus on a control after clicking tabs in TabPane?
If you handle the mouse release event, it works: (The doFocus enables the requestFocus handling only when a tab selection changed before, otherwise it kicks in every time you click somewhere in the TabPane.)
final SimpleBooleanProperty doFocus = new SimpleBooleanProperty(false);
tabPane.setOnMouseReleased(new EventHandler<Event>() {
#Override
public void handle(Event event) {
if (!doFocus.get()) {
return;
}
doFocus.set(false);
switch (tabPane.selectionModelProperty().getValue().selectedIndexProperty().intValue()) {
case 0: tf1b.requestFocus(); break;
case 1: tf2a.requestFocus(); break;
default: break;
}
}
});
tabPane.selectionModelProperty().getValue().selectedIndexProperty().addListener(new ChangeListener<Number>() {
#Override
public void changed(ObservableValue<? extends Number> observable,
Number oldValue, Number newValue) {
doFocus.set(true);
}
});
When the TabPane has focus, one can change tab selection with the cursor keys and there the TextFields also won't get the focus with selection based approach. This probably should be handled too, if you need it.
(Recently I had a similar problem. I noticed, that the TabPane switches tabs immediately when you press the mouse button. My guess would be, that the selection based approach requests focus on the TextField right after mouse down, but the continued mouse down steals the focus back to the TabPane. Or maybe even the single mouse down event which changes selection causes the focus to go back to TabPane. However, my assumptions regarding the reasons may not be correct, as I am a newbie to JavaFX.)
EDIT: That handling certainly is not optimal. For instance, if you change tabs with the keys, the doFocus will be enabled and then clicking anywhere in the TabPane will trigger the requestFocus call. I thought this should be mentioned.
Also, take a look at my solution for setting focus on TextArea, when user changes selected tab(using mouse or keyboard) https://stackoverflow.com/a/19046535/2791746