Develop Reference

How to delete a CheckBox from a TableView in JavaFX?

I'm writing a seating chart program using JavaFX. I have a table that keeps a list of students together that holds their name, grade, and whether they are present or absent (using a checkbox). I have a delete button that allows me to delete the students from the list. This works fine, however, whenever I delete the student object, the checkbox does not go along with it. I'm not sure what I would need to add to get that to work. Here is a snippet of the delete code. There are also two images below that show my problem. This is my first post so please let me know if I missed something. Please help! Thanks!
ObservableList<Student> items, sel;
items = currentTable.getItems();
sel = currentTable.getSelectionModel().getSelectedItems();
Student s = new Student("", "", 0, "");
for (Student p : sel) {
items.remove(p);
s = p;
}
Before Delete
After Delete

This has nothing to do with the delete or remove method. It has to do with what you did in TableColumn.setCellFactory().
To get the checkbox you shown, you should have used (in general) one of the two methods:
Overriding updateItem() in TableCell while setting Cell Factory
There is this empty parameter in updateItem() which indicates whether the row is empty or not. You need to use that to determine when not to show the checkbox.
column.setCellFactory(col -> {
return new TableCell<Foo, Boolean>() {
final CheckBox checkBox = new CheckBox();
#Override
public void updateItem(final Boolean selected, final boolean empty) {
super.updateItem(selected, empty);
if (!this.isEmpty()) {
setGraphic(checkBox);
setText("");
}
else {
setGraphic(null); // Remove checkbox if row is empty
setText("");
}
}
}
}
Using CheckBoxTableCell
JavaFX API has this convenient class CheckBoxTableCell that would do all these for you. Most people find this class hard to use because there are 2 things that you need to ensure to use it correctly:
The TableView that the column belongs to must be editable.
The TableColumn itself must be editable.
Example:
tableView.setEditable(true);
tableColumnSelected.setCellFactory(CheckBoxTableCell.forTableColumn(tableColumnSelected));
tableColumnSelected.setEditable(true);
As for whether which entry you want to be removed with the delete button, you just need to remove the correct items from the TableView.

How to force combobox to render autocomplete options?

This is my zul code:
<combobox id="digitalPublisherCombobox" value="#load(ivm.inventory.digitalPublisherName)"
onOK="#command('setDigitalPublisher', digitalPublisherBox = self)"
onSelect="#command('setDigitalPublisher', digitalPublisherBox = self)"
onChanging="#command('setupQuicksearchByEvent', searchlayout = event, prefix = 'PUB', tags = 'PublisherName, PublisherNameTranslit')"
mold="rounded" hflex="1" buttonVisible="false" autodrop="true">
<comboitem self="#{each=entry}" value="#{entry.key}" label="#{entry.value}"/>
</combobox>
And this is QuickSearch implementations:
#Command
public void setupQuicksearchByEvent(#BindingParam("searchlayout")Event event, #BindingParam("prefix") String prefix, #BindingParam("tags") String tags) throws WrongValueException, SearchException, IOException
{
if(event instanceof InputEvent)
{
InputEvent inputEvent = (InputEvent) event;
String inputText = inputEvent.getValue();
List<String> searchFields = Arrays.asList(tags.split(","));
ListModel model = new ListModelMap(ZKLogic.findDocsStartingWith(prefix, searchFields, "proxy", inputText), true);
ListModel subModel = ListModels.toListSubModel(model, Autocompleter.MAP_VALUE_CONTAINS_COMPARATOR, 10);
Combobox searchBox = (Combobox) event.getTarget();
searchBox.setModel(subModel);
searchBox.setItemRenderer(new ComboitemRenderer()
{
#Override
public void render( Comboitem item, Object data, int pos ) throws Exception
{
String publisherString = data.toString();
UID key = getUidFromPublisherString(publisherString);
int startIndex = publisherString.indexOf('=') + 1;
String publisher = publisherString.substring(startIndex);
item.setLabel(publisher);
item.setValue(key);
}
});
}
}
ZKLogic.findDocsStartingWith return map with UID-key and String-value.
With code above I achieved to get dropdown list when I switch to another window. I need to type something, then select another browser or notepad window - and comboitems will be displayed immediately.
So, my question still need answer, is there are any techniques to reproduce this windows switching in code? Or maybe I should do something with autocomplete, because I've got some ac working with preloaded lists, but this thing should return only 10 records from db, instead of all 70000 entries, every time when user type something in the field.
Edit 20/09/2013: Problem still exist. Rename question a bit, because thing that I need is to call render option by force in code. Is there is any way to do it? Code hasn't changed a lot, but print option in render method said, that method can miss two or more onChange events and suddenly render text for one variant.
Maybe you know another autocomplete options in zk framework where database participating? I'm ready to change implementation, if there is a guide with working implementation of it.

Ok I see two problems, you should solve first.
Setting the Renderer in every call of setupQuicksearchByEvent(...).
that is not logical, cos it is the same every time.
Add to the zul combobox tag something like
itemRenderer="#load(ivm.myRenderer)" ....
If you want just 10 items, do not let the db-request return more then 10.
If you use JPA klick here or for sql here or just google a bit.
After you fixed this two issues, we can exclude these as a reason of the unexpected behavior and fix it, if it is still present.
Edit
Ok, I have two possible ways to fix it.
Call Combobox#invalidate()
This schould force zk to rerender the Combobox, but could
lead to low performance and I would not prefer this.
Use Listbox with the select mold instead of Combobox.
To force the rerender, use Listbox#renderAll()

Try setting the selected item on your combobox or throw its related event

Solution is simple. Really. Nothing is better then brute-force, but I think I tried to avoid it and use it in despair.
#Command
public void setupQuicksearchByEvent(#BindingParam("searchlayout")Event event, #BindingParam("prefix") String prefix, #BindingParam("tags") String tags) throws WrongValueException, SearchException, IOException
{
if(event instanceof InputEvent)
{
InputEvent inputEvent = (InputEvent) event;
String inputText = inputEvent.getValue();
List<String> searchFields = Arrays.asList(tags.split(","));
Map<UID, String> publishers = ZKLogic.findDocsStartingWith(prefix, searchFields, "proxy", inputText);
Combobox searchBox = (Combobox) event.getTarget();
searchBox.getChildren().clear();
for (Map.Entry<UID, String > entry : publishers.entrySet())
{
Comboitem item = new Comboitem();
item.setLabel(entry.getValue());
item.setValue(entry.getKey());
searchBox.appendChild(item);
}
}
}

How can I (un)hide a SWT TableItem?

I am trying to allow my user to search through a table of information, dynamically hiding/showing results that contain the search. I have the hiding part down, and it works well, but I'm having trouble showing the table item again once the search criteria is changed.
Here is my hide code:
searchField.addModifyListener(new ModifyListener() {
#Override
public void modifyText(ModifyEvent arg0) {
modified = true;
for (int i = 0; i < table.getItems().length; i++) {
if (!(table.getItem(i).getText(2)
.contains(searchField.getText()))) {
table.getItem(i).dispose();
}
}
if ("".equals(searchField.getText())) {
modified = false;
//where I would want to un-hide items
}
}
});

Looking at your code, it seems you try to hide the item by calling dispose(). If you dispose a widget, it is gone for good. You cannot get it back.
If you want to unhide it again, will have to create a new item at the position of the previously hidden one with the same content.

Isn't it better to actually operate with some kind of a table model and JFace bindings, rather, then do it like that? And yes, disposing is not hiding. You should probably remove the item from the table.

You have probably to save the data from TableItem into collection before you call dispose. Then when you search again you could check that collection and if matches are found, then insert back into Table by creating new TableItem.

How to get the table whose cell is currently being clicked?

I've two tables in panels. When I click on first table on some cell, its row is getting selected. And when I click on the second table on some cell, its row is also getting selected.
Now, How will I come to know, which table is last clicked. I tried with isRowSelected on both the tables, both are returning, so I'm not able to find the last clicked table?
Can somebody help me?

you have to read how
JTable
ListSelectionListener
works,
you have to understand both concepts, simple example here, another here

I don't know if this must be determined from a MouseListener or from a ListSelectionListener, but the simplest solution is similar: use a different listener for each table:
table1.addXxxListener(new XxxListener() {
// here, you know it's table 1
}
table2.addXxxListener(new XxxListener() {
// here, you know it's table 2
}

Another way to do it is to check the source of the event:
new ListSelectionListener() {
#Override
public void valueChanged(ListSelectionEvent e) {
if (e.getSource()==table1.getSelectionModel()) {
// Event comes from table1
} else if (e.getSource()==table2.getSelectionModel()) {
// Event comes from table2
}
}
}
Of course this is true if and only if the selection model is used by a single table (which is the case if you have not set your own ListSelectionModel)

problem when implementing a selection listener in a JTable

I am developing a JTable with different rows. I would like to associate an event to the selection of a row in this table. I have used the following selection class to provide behaviour to the table selection:
public class TableSelectionListener implements ListSelectionListener{
public Integer item;
public TableSelectionListener(Integer item){
this.dialog = item;
}
public void valueChanged(ListSelectionEvent e) {
System.out.println("The row clicked is "+item);
}
}
When I create an instance of this table, sai tabletest, I have added the following piece of code:
tabletest.getSelectionModel().addListSelectionListener(new TableSelectionListener(tabletest.getSelectedRow());
The problem is that when I click on one row once, instead of retrieving the related message once, I retrieve the same message several times, suggesting that the actions repeated several times. For example:
The row clicked is 0
The row clicked is 0
The row clicked is 0
The row clicked is 0
Does anyone know where the problem may be?

Well, that's just normal.
Your selection listener is created with the value of tabletest.getSelectedRow() at its creation table (which is zero). And, as you never change the value of item in your listener, this listener fcan only display 0as a result.
If I were you, I wouold replace the valueChanged() method by something like (although it's untested and I remember strange things happens sometimes when mixing view and model row values) this :
public void valueChanged(ListSelectionEvent e) {
if(!e.getValueIsAdjusting()) // added as sometimes, multiple events are fired while selection changes
System.out.println("The row clicked is "+e.getFirstIndex());
}

Firstly, it's perfectly normal to get multiple ListSelectionEvents, while the selection is being changed. You can use the getValueIsAdjusting method to determine when selection has ended (it will return false).
Secondly, there's no need to construct your TableSelectionListener with a row number. When your valueChanged method is called, you can get the index of the first/last selected row (remember it's possibly to select multiple rows in the table, unless you disable that) using e.getFirstIndex() and e.getLastIndex() respectively.

An easier way of doing it, is as follows:
table.getSelectionModel().addListSelectionListener(new ListSelectionListener() {
#Override
public void valueChanged(ListSelectionEvent e) {
System.out.println("e...."+table.getSelectedRow());
}
});