I am using this link for creating a ContextMenu for each table row. Right now I'm running into problems because I'm not sure how to attach a ContextMenu after the 'type' has been inserted into a row.
Lets say I'm using a .zip editor program, and it lists the contents. I have an Image, and a text file, and some other stuff, all of them are under a class called Entry. My table's generic type is 'Entry', and I'd like to be able to create a context menu for each entry based on it's underlying subclass type (like an ImageEntry might return a menu item to open it up in an image editor...etc).
Right now I have a generic context menu for everything, but it's not great displaying a menu item about opening a text file with an image editor...
Is this possible to do? If so, what is the proper way to go about doing it?
Add a listener to the row's itemProperty (which represents the item displayed in the row) and update the context menu when it changes:
table.setRowFactory(new Callback<TableView<Person>, TableRow<Person>>() {
#Override
public TableRow<Person> call(TableView<Person> tableView) {
final TableRow<Person> row = new TableRow<>();
final ContextMenu contextMenu = new ContextMenu();
row.itemProperty().addListener((obs, oldPerson, newPerson) -> {
contextMenu.getItems().clear();
// add items to context menu depending on value of newPerson
// ...
});
// Set context menu on row, but use a binding to make it only show for non-empty rows:
row.contextMenuProperty().bind(
Bindings.when(row.emptyProperty())
.then((ContextMenu)null)
.otherwise(contextMenu)
);
return row ;
}
});
Related
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.
Well it appears I have been stumped by one of the simplest ListView implementations out there. For a few days I have found it impossible to properly reallocate a JavaFX ListView. I am working on making an EntityView completely dynamic, being able to remove elements whenever needed through a ContextMenu. So I have a ListView that is populated by an ArrayList, which we will refer to as "renderable". When you select "Remove" in the context menu, it removes the Entity from the renderable list, which also happens to be the "value" of the List Cell on whom I right clicked. Afterwards, I wish to refresh the ListView and remove now the nonexistent cell. So by creating a new ObservableList with the new renderable list (which removes the correct entity and that works fine), I set the items in the ListView, which does jack shit. I can set the list to null in this case, which removes all the elements. But I cannot reset the list with the new array and it remove the now missing entity. Somebody point me in the right direction please!
When I use the method I stated above, it removes it from the list, but not visually. There becomes an unusable cell at the bottom of the list, which has its name.
public void createContextMenu(final Entity curr, MouseEvent me){
MenuItem[] items = {new MenuItem("EDIT TYPE"), new MenuItem("REMOVE")};
ContextMenu menu = new ContextMenu(items);
menu.show(list, me.getScreenX(), me.getScreenY());
items[1].setOnAction(new EventHandler<ActionEvent>(){
public void handle(ActionEvent arg0) {
CanvasTab tab = (CanvasTab) core.canvasTabbedPane.getSelectionModel().getSelectedItem();
Kanvas k = tab.canvas;
k.renderable.remove(curr);
System.out.println(k.renderable);
k.redraw();
EntityView.this.list.getItems().remove(curr);
ObservableList<Entity> temp = FXCollections.observableList(k.renderable);
EntityView.this.list.setItems(temp);
}
});
}
This is the context menu:
I am implementing a custom cellFactory on a TreeView component and I would like to call the startEdit() function on a certain tree item. According to the javaFX documentation, the following method should work:
// "Item Title" is the title of the item to be edited
tree.edit(new TreeItem<String>("Item Title"));
But nothing happens when I use it. I am only able to start the editing mode by double clicking the tree item itself, and I would like to be able to call this function automatically when the user creates a new treeItem:
// Create a new TreeItem
TreeItem<String> item = new TreeItem<String> ("New Item");
// Insert it to the current tree
tree.getRoot().getChildren().add(item);
// Enter edit mode
tree.edit(item);
I want to completely view updates when a row is selected in a CellTable. How can this be done? In the following test case, using NoSelectionModel, the view is still updated: clicking on a row changes the background and border colors of the row until another row is clicked.
CellTable<String> table = new CellTable<String>();
TextColumn<String> column = new TextColumn<String>()
{
#Override
public String getValue(String string)
{
return string;
}
};
table.addColumn(column);
List<String> sampleData = Arrays.asList("foo", "bar", "baz");
table.setRowData(sampleData);
final NoSelectionModel<String> selectionModel = new NoSelectionModel<String>();
table.setSelectionModel(selectionModel);
RootPanel.get().add(table);
I've also attempted to subclass SingleSelectionModel with empty override methods, without success.
I can fake the behavior I want by providing empty CSS stylings for selected rows, but that method seems hack-ish.
What you're seeing is the keyboard-selection highlighting (really useful when you're not using the mouse to interact with the table).
You can disable it using setKeyboardSelectionPolicy(KeyboardSelectionPolicy.DISABLED)
Requirement:
I have a list of strings displayed in the ComboBox. Each of these Strings can have some properties. These properties are displayed in PropertyTable. ComboBox's selected Item's properties are displayed in the table. In addition, we use PropertyTable for editing or setting property values to the selected item in the comboBox.
Problem:
The moment I de-select the comboBox Item,say item1, all the existing property values in the PropertyTable are set as new property values to item1. Again, when I select this item1 back, I should get above property values(i.e values before item1 is Deselected) back in to the PropertyTable?
Current Implementation Logic:
I am having TableCellListner for each PropertyTableCell, whenever cell content is changed, it takes the cell's new value and assigns this as new property value to the combo box's selected item. whenever new item is selected, table is refreshed with the selected Item's property values.
//before is Table initialization code
Action action = new AbstractAction()
{
public void actionPerformed(ActionEvent e)
{
TableCellListener table = (TableCellListener)e.getSource();
String selectedItem=(String)ComponentPropComboBox.getSelectedItem();
if(table.getColumn()==1 && selectedItem!=null)
{
Property property=propertyMap.get(selectedItem);
else if(table.getRow()==0)
{
property.setProperty("MIN_LENGTH", (String)table.getNewValue());
propertyMap.put(selectedItem, property);
}
else if(table.getRow()==1)
{
property.setProperty("STARTS_WITH_STRING", (String)table.getNewValue());
propertyMap.put(selectedItem, property);
}
}
}
};
TableCellListener tcl = new TableCellListener(PropertiesTable, action);
How do i implement this requirement by overcoming the above challenge?
PS:
TableCellListner is a Not a java generic library. You can view code and its explanation at the following links:
http://www.camick.com/java/source/TableCellListener.java
http://tips4java.wordpress.com/2009/06/07/table-cell-listener/
I believe the question is obvious! Pls do let me know if question is not clear.Thanks in advance for your help & donating the knowledge!
In the code that listens for JComboBox selections. At its start have it set a boolean that the item is being changed. Then have your table refresh code ignore events that come while the boolean is set. After you are finished refreshing then set the boolean back.