I need a reference to the object under the mouse cursor in a javaFX Pane (or ScrollPane)
The following code removes the node under the cursor from the Pane.
The node object is stored in an ArrayList and has a unique id. If I had a reference to the node object, it would be a simple matter to remove it from the list. I'd be happy just to be able to pull the id of the node object out of the target description supplied by the MouseEvent's description of the target, and use it to find my node in the list. Note: I am creating these nodes dynamically and they are nameless: myList.add(new TYPE()).
Here's the snippet that I'm using to remove the node in the Pane;
root.setOnMouseClicked(new EventHandler<MouseEvent>() {
#Override
public void handle (MouseEvent me) {
// would like a line here that grabbed the reference to the target
pane.getChildren().remove(me.getTarget());
}
});
It would be better for you to put the setOnMouseClicked listener to the node on which you want to remove from the list.
List<Node> listOfNodes = new ArrayList();
Node node = new Node();
listOfNodes.add(node);
node.setOnMouseClicked((event) -> {
listOfNodes.remove(node);
});
Note: Better use ObservableList than the ordinary ArrayList especially if you want that node to be removed also out from the root pane.
To James_D: Reason for disbelief: the syntax that fails to get past the compiler is the statement containing the expression me.getTarget().getText() which is commented out. It seemed to me that that ought to have worked.
for (Text tl : textList)
if ( (me.getTarget()) == (tl) )
{
System.out.println("HuRah!");
System.out.println("text is " + tl.getText());
//System.out.println("text is " + me.getTarget().getText());
textList.remove(me.getTarget());
}
Related
so I am using JavFX to create a form that stores all the answers in a csv file. I need to create a dropdown menu that allows the users to select an option, which is then recorded in the csv file. I have tried a lot of different options, however I think comboBox is the best option.
I have no problem creating the ComboBox, I only run into problems when it comes to the method to get the value of the box.
Can someone help me find a solution, or suggest what another JavaFX menu I can use?
This is the code I have right now:
public VBox setFamiliar(){
Button button = new Button();
button.setOnAction(e -> toString());
familiarComboBox = new ComboBox<>();
familiarVBox = new VBox();
familiarComboBox.getItems().addAll("Irmão", "Irmã", "Avó", "Avô", "Tio", "Tia", "Pai", "Mãe");
familiarVBox.getChildren().add(familiarComboBox);
familiarVBox.getChildren().add(button);
return familiarVBox;
}
Here I set the ComboBox, this part doesnt seem to have a problem because it appears and I can select an item. I created a separate void toString() method that sets the value of a variable to the current selected item
public void toString(ActionEvent e){
familiar = familiarComboBox.getSelectionModel().getSelectedItem().toString();
}
The problem is then in the get method to get the value that was selected.
public String getIrmao(){
if(familiar.equals("Irmão")){
return "2";
}
return "0";
I also tried to do familiarComboBox.getSelectionModel().getSelectedItem().equals(), and other variations of this combination.
If I understand your requirement -- that when a user makes a choice from the "Familiar" combo box, a value should be written immediately to a CSV file -- you don't need the getIrmao() method. You simply write the value out in the action which you are calling toString(...) (not a good choice of names), but which we will rename to handleFamiliarChange(...).
Now the method becomes
public void handleFamiliarChange(ActionEvent e){
final String familiar =
familiarComboBox.getSelectionModel().getSelectedItem().toString();
FileUtils.writeToCsvFile(familiar.equals("Irmão") ? 2 : 0);
}
where FileUtils.writeToCsvFile(...) is a method that does the file writing. Note that FileUtils is a class you have created to separate out file handling concerns -- your JavaFX view class should only concern itself with views.
i have the following method:
CreateStrip createStrip = new CreateStrip(input);
depBox.getChildren().add(createStrip.getStripGrid());
depBox is a VBox and .getStripGrid() return a GridPane.
CreateStrip has this method too:
public String getNameStrip() { return input.getNameStrip();}
during the life of the program depBox get many GridPane, each one with a different NameStrip.
sometimes i have the necessity to remove a specific GridPane from depBox that match with .getNameStrip().
i have tried:
for (Node node: depBox.getChildren()) {
//TODO REMOVE GRIDPANE CONTAIN THE NAME THAT MATCH WITH THE MESSAGE RECEIVED..
}
but i don't know how to set the matching control.
Step 1:
Attach data to the GridPane that allows you to identify the one to remove.
You could do this by using Node.setUserData or by using the properties Map (which I'll do in the following code snippets).
Creating the GridPane
GridPane gp = createStrip.getStripGrid();
gp.getProperties().put(NAME_KEY, createStrip);
depBox.getChildren().add(gp);
// use object not equal to any other object as key (i.e. equals uses reference equality)
static final Object NAME_KEY = new Object();
Step 2:
Use the information to remove the appropriate GridPane. searchName is the String that identifies the GridPane you want to remove (to check for equality with getNameStrip()):
depBox.getChildren().removeIf(c -> {
CreateStrip strip = (CreateStrip) c.getProperties().get(NAME_KEY);
return strip != null && searchName.equals(strip.getNameStrip());
});
Depending on your CreateStrip class it may not be necessary to add a instance of it as property. It may not even be the right thing to do, if it's a factory, but I think you get the idea nontheless.
Alternative
You can also assign a value to the id property of the Node and use those to identify the correct node using Node.lookup. However those need to be unique and be a valid css id, but you could use a Map to map from message to id.
I've a couple of copied elements in an observablelist which I use for copy/paste operations in a TableView. The name of the table is cpTable (copy and paste Table) for storing copied elements and to paste elements that are stored in the table. After each paste operation I want to clear the contents of cpTable before I copy other selected items with Ctrl+C.
But I always get the error:
JavaFX Application Thread" java.lang.UnsupportedOperationException:
Not supported.
at com.sun.javafx.scene.control.ReadOnlyUnbackedObservableList.remove(ReadOnlyUnbackedObservableList.java:246)
Here is my pseudocode:
if (cpTable !=null) {
//first, get all copied items for removing all elements
ObservableList<String> copiedItems = cpTable.getItems();
int size = copiedItems.size();
// remove all elements
for(int i=0;i<size;i++) {
copiedItems.remove(i);
}
cpTable.setItems(copiedItems); //clear cpTable by setting an empty list
}
This is a method that copies the contents of selected items and puts it in a cpTable
public TableView<String> copySelectionToClipboard(TableView<String> table) {
ObservableList<String> data = table.getSelectionModel().getSelectedItems();
TableView<String> tmp = new TableView<>();
tmp.setItems(data);
return tmp;
}
When Ctrl+C is pressed the following line puts all copied items in a cpTable:
cpTable = copySelectionToClipboard( (TableView<String>) keyEvent.getSource());
As mentioned I want to clear all cpTable contents immediately after pasting
the items in a table.
Just clear your Observable List. It looks like you should use copiedItems.clear();
That should clear your table.
As James_D already mentioned, you haven't cleared exactly what's the point.
If you want to delete selected items from a table, you need to delete them from the table item list itself and not from the selection model.
A possible solution looks like this:
TableView<String> table = new TableView<>();
ObservableList<String> tableItems = table.getItems();
// needs multirowselection is set to true
ObservableList<String> readOnlyItems = table.getSelectionModel().getSelectedItems();
// removes all selected elements for the table
readOnlyItems.stream().forEach((item) -> {
tableItems.remove(item);
});
// clear the selection
table.getSelectionModel().clearSelection();
Update
This method get's an TableView, calls it's selection model to get all selected items. And then you add the data to a new TableView. And there is the problem! It's an unmodifiable read only list that you attached to your new table. First make it modifiable, like in the code below:
public TableView<String> copySelectionToClipboard(TableView<String> table) {
ObservableList<String> readOnlyData = table.getSelectionModel().getSelectedItems();
ObservableList<String> writableData = FXCollections.<String>observableArrayList(readOnlyData);
TableView<String> tmp = new TableView<>();
tmp.setItems(writableData);
return tmp;
The next problem is in your call to this method. You call it with a TableView<CsvData> and with a TableView<String> as your method needs. If CsvData is a subtype of String, than you have to change your method signature to TableView<? extends String>
If you are trying to clear all the items from your tableView and want just an empty tableView. You can use this:
myTableView.getItems().clear();
This basically gets all the items from your table view which is nothing but just the observable list now it performs clear operations to remove all the items in tableView.
Assuming you mean
table.getSelectionModel().getSelectedItems()
(since the selection model has no getItems() method), according to the Javadocs, this returns a read-only list. Thus attempting to modify the list will throw an UnsupportedOperationException.
To clear the selection, do
table.getSelectionModel().clearSelection();
(And similarly, if you want to manipulate the selection in any other way, you use methods on the selection model, rather than on the list.)
I have an application that I am building that has a table in it, I'm not using a tableview to build this table because I need each row to be able to expand similar to an accordion. I was able to achieve what I need by using a timeline and looping through the data and building each row (its kind of crude right now since I'm still working with dummy data eventually it will be a list iterator and not just a for loop) but I'm not happy with how its done. There are a lot of default values that will never change so I don't really need to set them in my worker class every time, I decided to just add them to the object class that I put together. So basically, at a high level it looks something like this:
for (int i = 0; i < 30; i++) {
RowBuilder builder = new RowBuilder(tableBox, i);
try {
builder.run();
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
I'm passing it the parent which is a VBox - tableBox, then I'm passing the count for later use.
Inside the RowBuilder I'm getting a new instance of the object DashboardRow which has all the defaults set in it, then I'm setting the data for each row and returning the DashboardRow.
Here is an example of a getter setting values in the DashboardRow
public HBox getMainRow() {
mainRow.setAlignment(Pos.CENTER_LEFT);
mainRow.setPrefHeight(60);
mainRow.setMinHeight(60);
mainRow.setMaxHeight(60);
mainRow.setPrefWidth(-1);
mainRow.setStyle("-fx-background-color:#FFFFFF;");
return mainRow;
}
Inside the DashboardRow class I have a ton of new objects being created for every element I need in the row. There are 21 for each row, mostly VBox, HBox and StackPane to build the actual row, the rest are just labels and buttons.
This is what is looks like so far. Opened and closed states.
Is there a better way to dynamically build things like this in javafx? I'm basically pulling data from a database and looping through that data to populate a row.
I can't comment but it may be an answer anyway. Why can't you use the setGraphic method of a custom table cell and put the accordion node in a table. setGraphic takes any kind of node.
It sounds simpler than what you're doing.
I just tried it out with the Oracle sample and it works great.
I added
Callback<TableColumn<Person, String>, TableCell<Person, String>> accCellFactory
= new Callback<TableColumn<Person, String>, TableCell<Person, String>>() {
#Override
public TableCell call(TableColumn p) {
TitledPane t1 = new TitledPane("T1", new Button("B1"));
TitledPane t2 = new TitledPane("T2", new Button("B2"));
TitledPane t3 = new TitledPane("T3", new Button("B3"));
Accordion accordion = new Accordion();
accordion.getPanes().addAll(t1, t2, t3);
TableCell tc = new TableCell();
tc.setGraphic(accordion);
return tc;
}
};
and changed this line firstNameCol.setCellFactory(accCellFactory);
and I get
Of course you might want something other than buttons but I just copied the Accordion sample from the javadoc.
In my other methods (data, text, etc.) the setItem method works fine to display changes made to a tree item. However, calling setItem after changing an item's icon doesn't seem to have any effect. What is the best way to update the tree item so the new icon appears?
Thanks
public void modified()
{
FormTreeItem workingItem;
;
super();
//find the current item
workingItem = FormTreeControl.getItem(FormTreeControl.getSelection());
//update the value
workingItem.Image(1);
//update the item in the list
FormTreeControl.setItem(workingItem);
}
Found a couple of issues here:
1. Never found a way to update the icon on a tree item effectively.
2. Found out some of the tree control objects aren't initialized if you try to add/delete from a datasource method, so deleting items throws Object Not Initialized errors.
Fixed it by:
1. Create a new item (addAfterIdx of the old item).
2. Delete the old item.
3. Select the new item.
3. Move the method from the datasource to the actual form control.
Here's the code that worked for me:
public boolean modified()
{
boolean ret;
FormTreeItem workingItem = FormTreeControl.getItem(currentEditingIdx);
TreeItemIdx newItemIdx;
;
ret = super();
//create a new item
newItemIdx = SysFormTreeControl::addTreeItem(FormTreeControl, workingItem.text(), FormTreeControl.getParent(workingItem.idx()), workingItem.data(), element.imageIdx(ABC_Icon.text()));
//delete the old item
FormTreeControl.delete(currentEditingIdx);
//select the new item
FormTreeControl.selectionChanged(FormTreeControl.getItem(FormTreeControl.getRoot()), FormTreeControl.getItem(newItemIdx), FormTreeSelect::Unknown);
return ret;
}