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(GXT) Change registration in ALL Children of Popup Panel

I have the following Problem in my GXT-Application:
In a Popup-Panel, I have a bunch of different fields, which are to be saved in a Databse (see picture)
I would add a new feature, which recogizes changes in the Children of this Popup-Panel. For this reason, I added a Change-Event to the Popup-Panel:
editorPanel.addHandler(new ChangeHandler() {
#Override
public void onChange(ChangeEvent event) {
Info.display("Change","Now");
}
}, ChangeEvent.getType());
My Problem is now, that this only works with DataFields but not with Comboboxes. As far as I understood, this is due to the fact, that Comboboxes do not have a Change-Event but a Select-Event.
And here is my question: Is there an elegant way to gat those changes on the Level of the Popup-Panel or do I have to thriger the change event by every selection?
Sincerely,
Erik

In LibGDX scene2d, after changing the items of a selectbox, it no longer has a default listener

I dont think my problem is that hard to solve but I have been searching for a while and cant figure it out.
I have two scene2d SelectBox widgets one above the other, in a table, on a stage. Let's call them A and B. Whatever is selected in A determines which list is shown in B. I implement this using a ChangeListener on A and all works fine (this isn't the problem).
However, my list A was getting extremely long (500+ items) so I wanted to add a TextField above it which would search and match the strings, replacing the old list of A with a shorter one, making it much easier to find what you are looking for. This works fine, I use a ChangeListener on the textfield to get the string, compare it to a main list of strings using a for loop and use aList.setItems(); to add the adjusted string to the SelectBox. The list displays (without a click, so I use aList.showList(); in the ChangeListener of the TextField) and I think this is where the problem occurs - instead of a click, showList() is called from elsewhere. Lets say I change my mind and want to select a different item from A, it will no longer drop down the menu on click. Yet if I change the text which is in the search bar, it displays the list. When the list is displayed, I can click an item and it hides as normal.
This might seems a bit confusing, so here is the code (edited for clarity, so if something is missing let me know)
SelectBox aSelect, bSelect;
TextField searchBar;
Stage stage;
Table table;
Skin skin;
ArrayList<String> completeAList;
ArrayList<String> abrevAList;
public chooseItemScreen()
{
stage = new Stage(new ScreenViewport());
skin = new Skin(Gdx.files.internal("uiskin.json"));
table = new Table();
table.setFillparent(true);
completeAList = new ArrayList<String>;
abrevAList = new ArrayList<String>;
aSelect = new SelectBox(skin);
//ItemList is a class with the list of strings as a static method
completeAList = ItemList.getAList();
aSelect.setItems(completeAList.toArray());
//bSelect omitted as is same as A
//aSelect changeListener also omitted as it is working fine
searchBar = new TextField("", skin);
searchBar.setMessageText("SEARCH LIST");
searchPokemon.addListener(new ChangeListener() {
#Override
public void changed(ChangeEvent event, Actor actor) {
updateASelect();
}
});
table.add(searchBar);
table.row();
table.add(aList);
stage.addActor(table);
Gdx.input.setInputProcessor(stage);
}
private void updateAList()
{
abrevAList.clear();
aSelect.clearItems();
aSelect.hideList()
for (String string: completeAList)
{
if (string.toLowerCase().startsWith(searchBar.getText().toLowerCase()))
{
abrevAList.add(string);
}
}
if (abrevAList.isEmpty())
{
abrevAList.add("NOT FOUND");
}
aSelect.setItems(abrevAList.toArray());
//It's at this point where I am no longer to click on aSelect
//I can still select an item from the drop down list, closing the list
//it's just I can't show list by clicking on the widget after that
aSelect.showList();
}
#Override
public void render(float delta) {
Gdx.gl20.glClearColor(0,0,0,0);
Gdx.gl20.glClear(GL20.GL_COLOR_BUFFER_BIT);
stage.act();
stage.draw();
}
I added the following listener to tell if the selectBox was being clicked (which it was). I gave all actors names
stage.getRoot().addCaptureListener(new InputListener() {
public boolean touchDown(InputEvent event, float x, float y, int pointer, int button) {
System.out.println(event.getTarget().getName());
return false;
}
});
The click is recognised, just the list doesn't show. In my opinion, it is a problem with calling showList() and changing the list at the same time.
Any help is appreciated, and if you need more code or any other information, let me know.
Thanks

Set a fixed size to the selectbox when adding it to the table, something like
table.add(selectBox).width(someValue);
or
table.add(selectBox).growX();
Also, after reviewing your code, I suggest you to remove
aSelect.clearItems();
aSelect.hideList();
And make ArrayList be just libgdx Array< String>, it will make things easier, wont cause allocation when iterating with ':' and you wont need .toArray() when setting the items of your selectboxes. You also can set SelectBox type with SelectBox< String>, and, you can add a row in the same line with table.add(something).row().
After changing the size of the selectbox cell your code worked just fine in my side.

GWT SuggestBox: How do I force the SuggestBox to select the first item in the suggestion list?

I have a textbox and one suggestbox. I attach a value change and key up handler to the text box such that whatever the user types (or pastes) into the text box is echo-ed inside the suggestbox. I can get the suggestbox to display the suggestion list by calling showSuggestionList on each value change and key up event.
Now, how do I get the suggestbox to automatically choose the first item in the suggestion list?
One of the methods I tried is to programatically simulate key presses, i.e
suggestBox.setFocus(true);
NativeEvent enterEvent = Document.get().createKeyPressEvent(false, false, false, false, KeyCodes.KEY_ENTER);
DomEvent.fireNativeEvent(enterEvent, suggestBox);
textBox.setFocus(true);
This doesn't work at all. The enter key isn't simulated. Another possible solution is to extend SuggestionBox.SuggestionDisplay, but I'm not too sure how to that. Any pointers appreciated.
Update: I'm still working on this and trying various methods.
Here, I tried to implement my own SuggestionDisplay by subclassing DefaultSuggestionDisplay and overriding getCurrentSelection() to make accessible from my class. This doesn't work either. Null is returned.
private class CustomSuggestionDisplay extends DefaultSuggestionDisplay {
#Override
protected Suggestion getCurrentSelection() {
return super.getCurrentSelection();
}
}
suggestBox.setAutoSelectEnabled(true);
textBox.addKeyUpHandler(new KeyUpHandler() {
public void onKeyUp(KeyUpEvent event) {
suggestBox.setValue(textBox.getText(), true);
suggestBox.showSuggestionList();
if (suggestBox.isSuggestionListShowing()) {
String s = ((CustomSuggestionDisplay) suggestBox.getSuggestionDisplay()).getCurrentSelection().getDisplayString();
Window.alert(s);
}
}
});
Here, I tried to attach a value change handler to the SuggestBox, and casting the event type to SuggestOracle.Suggestion. Again, null is returned.
suggestBox.addValueChangeHandler(new ValueChangeHandler<String>() {
public void onValueChange(ValueChangeEvent<String> event) {
String s = ((SuggestOracle.Suggestion) event).getDisplayString();
Window.alert(s);
}
});

Use suggesBox.setAutoSelectEnabled(true)
Here more info about the SuggestBox of GWT:

You could try using addSelectionHandler in conjunction with setAutoSelectEnabled to receive an event whenever a suggestion is selected. You could also have your Oracle send a message when it suggests something, or your Display send a message when it displays a list:
public class AutomaticallySelectingSuggestionDisplay extends SuggestBox.DefaultSuggestionDisplay {
#Override
protected void showSuggestions(SuggestBox box, Collection<? extends SuggestOracle.Suggestion> suggestions, boolean isDisplayHtml, boolean isAutoSelectEnabled, SuggestBox.SuggestionCallback callback) {
super.showSuggestions(box, suggestions, isDisplayHtml, isAutoSelectEnabled, callback);
fireValueChangeEventWithFirstSuggestion(suggestions);
}
}
This idea feels a little muddled to me, so I hope you can find a solution just using event handlers.

Avoiding create new ClickHandler Instances on every Click

im sitting on this for 4 hours now, and once again I end up on Stackoverflow because I just cant solve this (simple) problem.
I want to fire a method when I click a button, Google gives an Example like this:
// Listen for mouse events on the Add button.
addStockButton.addClickHandler(new ClickHandler() {
public void onClick(ClickEvent event) {
addStock();
}
});
But this creates a new Instance(?..How can they even create an instance of Clickhandler, since its an Interface) everytime the button is clicked. How can I solve this that all buttons share a Clickhandler and the Handler askes the Button which button he is, so he can fire the method attached to that button.
Any Ideas? If you this is to vage information and you require more code please let me know.
Thanks in advance,
Daniel

Java creates a new instance of an anonymous class that implements ClickHandler. Which it can do because you provide an implementation for the onClick function specified by the interface.
This class is however not created when you click on the button but at the moment you call addClickhandler. If you need the handler for multiple events do something like:
ClickHandler handler = new ClickHandler() {
public void onClick(ClickEvent event) {
addStock();
}
};
addStockButton.addClickHandler(handler);
someOtherButton.addClickHandler(handler);
Within the handler you can identify from where the event is coming using event.getSource().
If you have access to your button variables you could simply check the pointer
if (addStockButton == event.getSource()) ...
Or you can cast the result of getSource to the appropriate type and access the properties/methods of the object.

Eelke has already answered your question. I just add that if you would use GWT's UiBinder feature, you could achieve what you want like this:
#UiField
Button addStockButton;
#UiField
Button removeStockButton;
#UiHandler({ "addStockButton", "removeStockButton" })
void handleClickEvents(ClickEvent event)
{
if (event.getSource() == addStockButton)
{
addStock();
}
else if (event.getSource() == removeStockButton)
{
removeStock();
}
}

Its an anonymous instance of the interface, this is like declaring a new class that implements that interface.
I would have to ask why you would want to do this, you would need to make the ClickHandler contain a reference to its parent. You would also need to make the buttons identifiable so you can select the right one in the body of the ClickHandler. Is your need to only have a single instance really that bad that you can't have multiple anonymous instances ?

Can a value from a JTextField be forced into the ValueModel (JGoodies)

I have this code:
this.trigger = new Trigger();
this.presentationModel = new PresentationModel(this.personBean, this.trigger);
final ValueModel firstNameAdapter = presentationModel.getBufferedModel("firstName");
final JTextField firstNameTextField = BasicComponentFactory.createTextField(firstNameAdapter);
and
firstNameTextField.addActionListener(new ActionListener()
{
#Override
public void actionPerformed(ActionEvent e)
{
trigger.triggerCommit();
}
});
So when I push the enter button on the JTextField, I expect the value in my ValueModel class to be the same as the value in my JTextField. This doesn't happen unless I click outside the JTextField, then back inside the JTextField, and then push enter. If I just type in the text and hit enter, the ValueModel does not get the updated value. I am stuck on this problem, can anybody help?
BTW, I used this link for figuring out JGoodies in the first place: JGoodies Tutorial

I hope I am understanding your question correctly.
You need to get the text in the text field and set it in the ValueModel.
firstNameTextField.addActionListener(new ActionListener()
{
#Override
public void actionPerformed(ActionEvent e)
{
//this get the text from the text field
String firstName = firstNameTextField.getText();
//now write your code to set the firstname into the ValueModel
trigger.triggerCommit();
}
});

I looked through the JGoodies API (should have done this sooner) and found an unexpected static call, Bindings.commitImmediately()
If I call this method before my call to trigger.triggerCommit(), everything works as expected :)

Create a text field that commits on each key typed instead of when focus is lost:
BasicComponentFactory.createTextField(firstNameAdapter, false);
Also, you should consider architecting your program to not use buffered models. I find that they make things more complicated and tricky, and think I saw Karsten Lentzsch recommending not to use them as well in a mailing list.
The most useful way for me to learn JGoodies was to look at the tutorial code for the JGoodies binding and validation libraries.