I want to add a Hyperlink (or a text that is styled like a Hyperlink) in a TableViewerColumn Cell.
I tried this and this.
Summarize: I either get a clickable Hyperlink for which the text is cropped (the column width is too small) or I get a link that is not clickable (MouseListener missing, no cursor).
Both tries are making use of a StyledCellLabelProvider for the TableViewerColumn. The first try does this:
TableViewerColumn column = new TableViewerColumn(viewer, SWT.NONE);
column .getColumn().setText(TITLE);
column .setLabelProvider(new MyHyperlinkLabelProvider());
However, the text in the cell is cropped and I have no idea how to set the column width so that the text fits in the cell. I tried with using pack(), but it had no effect.
private final class MyHyperlinkLabelProvider extends StyledCellLabelProvider {
private MyHyperlinkLabelProvider() {
}
#Override
public void update(ViewerCell cell) {
TableItem item = (TableItem)cell.getItem();
String myText= "Hyperlink text, unfortunately cropped";
link = new MyHyperlink((Composite)cell.getViewerRow().getControl(), SWT.NONE);
toolkit.adapt(link);
link.setText(myText);
TableEditor editor = new TableEditor(item.getParent());
editor.grabHorizontal = true;
editor.grabVertical = true;
editor.setEditor(link, item, cell.getColumnIndex());
GridDataFactory.fillDefaults().applyTo(editor.getEditor());
editor.layout();
link.addMouseListener(new MouseAdapter() {
#Override
public void mouseUp(MouseEvent event) {
super.mouseUp(event);
if (event.getSource() instanceof MyHyperlink) {
MyHyperlink link = (MyHyperlink)event.getSource();
System.out.println("Label was clicked: " + link.getText());
}
}
});
super.update(cell);
}
}
private class MyHyperlink extends Hyperlink {
public MyHyperlink(Composite parent, int style) {
super(parent, style);
this.setUnderlined(true);
}
}
The less preferred alternative is given in the second link. If I cannot get the column width correct, I'd go with this.
The second link suggests to try it with StyledString instead of Hyperlink. The StyledString at least is shown in full width and the column has the correct width. However, you cannot add a MouseListener to a StyledString. Only on the table, but that doesn't help.
private final class MyHyperlinkLabelProvider extends StyledCellLabelProvider {
private MyHyperlinkLabelProvider() {
}
#Override
public void update(ViewerCell cell) {
TableItem item = (TableItem)cell.getItem();
String mytext= "This is the hyperlink text";
/* make text look like a link */
StyledString text = new StyledString();
StyleRange myStyledRange =
new StyleRange(0, phase.length(), Display.getCurrent().getSystemColor(SWT.COLOR_BLUE), null);
myStyledRange.underline = true;
text.append(mytext, StyledString.DECORATIONS_STYLER);
cell.setText(text.toString());
StyleRange[] range = {myStyledRange };
cell.setStyleRanges(range);
super.update(cell);
}
}
To have the column size computed correctly, the cell text has to be set. Although the Hyperlink is what should be displayed link.setText(myText); is not enough. cell.setText(myText) is needed, too.
One can see it in the second snippet, for which the column size is correct. It is because of the cell.setText() call.
I would like to remove some of the functionality of a Textfield.
When the enter or return keys are pressed, the field becomes empty. I would like the value entered to stay within the field.
I have tried overriding the submit method but this hasn't done the job:
widthTopField = new Textfield(controlP5, "widthField"){
# Override public Textfield submit(){
return this;
}
};
Demonstrates using .setAutoClear() to retain edit field contents after hitting return button. Field 1 is set to true and the other is set to false.
import controlP5.*;
ControlP5 cp5;
void setup() {
size(400,400);
PFont font = createFont("arial",18);
cp5 = new ControlP5(this);
cp5.addTextfield("Field 1")
.setPosition(40,50)
.setSize(200,40)
.setFont(font)
.setFocus(true)
.setColor(color(255))
.setAutoClear(true);
;
cp5.addTextfield("Field 2")
.setPosition(40,130)
.setSize(200,40)
.setFont(font)
.setAutoClear(false);
;
}
void draw() {
background(0);
}
So I have been experimenting with it a litle bit with javaFX and I came across some rather weird behavior which might be linked to the TableView#edit() method.
I'll post a working example on the bottom of this post again, so you can see what exactually is happening on which cell (debuging included!).
I'll try to explain all the behavior myself, though its way easier to see it for yourself. Basically the events are messed up when using the TableView#edit() method.
1:
If you are using the contextMenu to add a new item, the keyEvents for the the keys 'escape' and 'Enter' (and propably the arrow keys, though I dont use them right now) are consumed before they fire the events on the Cells (e.g. textField and cell KeyEvents!) Though it is firing the keyEvent on the Parent node. (the AnchorPane in this case).
Now I know for a fact that these keys are captured and consumed by the contextMenu default behavior. Though it shouldn't be happening since the contextMenu is already hidden after the new item is added. further more the textField should recieve the events, especially when it is focused!
2:
When you use the button at the bottom of the TableView to add a new Item, The keyEvents are fired on the Parent node (the AnchorPane) and the Cell. Though the textField (even when focused) recieve no keyEvents at all. I cannot explain why the TextField wouldn't recieve any event even when typed in, so I assume that would definitely be a bug?
3:
When editing a cell through double click, it updates the editingCellProperty of the TableView correctly (which I check for several times). Though when start editing though the contextMenu Item (which only calls startEdit() for testpurpose) It doesnt update the editing state correctly! Funny enough it allows the keyEvents to continue as usual, unlike situation 1 & 2.
4:
When you edit an item, and then add an item (either way will cause this problem) it will update the editingCellProperty to the current cell, though when stop editing, it somehow revert back to the last Cell?!? Thats the part where funny things are happening, which I really cannot explain.
Note that the startEdit() & cancelEdit() methods are called in weird moments, and on the wrong Cells!
Right now I dont understand any of this logic. If this is intended behavior, some explanation of it would be greatly appreciated!
This is the example:
package testpacket;
import javafx.application.Application;
import javafx.beans.property.SimpleStringProperty;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.event.ActionEvent;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.ContextMenu;
import javafx.scene.control.MenuItem;
import javafx.scene.control.TableCell;
import javafx.scene.control.TableColumn;
import javafx.scene.control.TableView;
import javafx.scene.control.TextField;
import javafx.scene.input.KeyCode;
import javafx.scene.layout.AnchorPane;
import javafx.stage.Stage;
public class EditStateTest extends Application
{
private static ObservableList<SimpleStringProperty> exampleList = FXCollections.observableArrayList();
//Placeholder for the button
private static SimpleStringProperty PlaceHolder = new SimpleStringProperty();
public static void main(String[] args)
{
launch(args);
}
#Override
public void start(Stage primaryStage) throws Exception
{
// basic ui setup
AnchorPane parent = new AnchorPane();
Scene scene = new Scene(parent);
primaryStage.setScene(scene);
//fill backinglist with data
for(int i = 0 ; i < 20; i++)
exampleList.add(new SimpleStringProperty("Hello Test"));
exampleList.add(PlaceHolder);
//create a basic tableView
TableView<SimpleStringProperty> listView = new TableView<SimpleStringProperty>();
listView.setEditable(true);
TableColumn<SimpleStringProperty, String> column = new TableColumn<SimpleStringProperty, String>();
column.setCellFactory(E -> new TableCellTest<SimpleStringProperty, String>());
column.setCellValueFactory(E -> E.getValue());
column.setEditable(true);
// set listViews' backing list
listView.setItems(exampleList);
listView.getColumns().clear();
listView.getColumns().add(column);
parent.getChildren().add(listView);
parent.setOnKeyReleased(E -> System.out.println("Parent - KeyEvent"));
primaryStage.show();
}
// basic editable cell example
public static class TableCellTest<S, T> extends TableCell<S, T>
{
// The editing textField.
protected static Button addButton = new Button("Add");
protected TextField textField = new TextField();;
protected ContextMenu menu;
public TableCellTest()
{
this.setOnContextMenuRequested(E -> {
if(this.getTableView().editingCellProperty().get() == null)
this.menu.show(this, E.getScreenX(), E.getScreenY());
});
this.menu = new ContextMenu();
MenuItem createNew = new MenuItem("create New");
createNew.setOnAction(E -> {
System.out.println("Cell ContextMenu " + this.getIndex() + " - createNew: onAction");
this.onNewItem(this.getIndex() + 1);
});
MenuItem edit = new MenuItem("edit");
edit.setOnAction(E -> {
System.out.println("Cell ContextMenu " + this.getIndex() + " - edit: onAction");
this.startEdit();
});
this.menu.getItems().setAll(createNew, edit);
addButton.addEventHandler(ActionEvent.ACTION, E -> {
if(this.getIndex() == EditStateTest.exampleList.size() - 1)
{
System.out.println("Cell " + this.getIndex() + " - Button: onAction");
this.onNewItem(this.getIndex());
}
});
addButton.prefWidthProperty().bind(this.widthProperty());
this.setOnKeyReleased(E -> System.out.println("Cell " + this.getIndex() + " - KeyEvent"));
}
public void onNewItem(int index)
{
EditStateTest.exampleList.add(index, new SimpleStringProperty("New Item"));
this.getTableView().edit(index, this.getTableColumn());
textField.requestFocus();
}
#Override
public void startEdit()
{
if (!isEditable()
|| (this.getTableView() != null && !this.getTableView().isEditable())
|| (this.getTableColumn() != null && !this.getTableColumn().isEditable()))
return;
System.out.println("Cell " + this.getIndex() + " - StartEdit");
super.startEdit();
this.createTextField();
textField.setText((String)this.getItem());
this.setGraphic(textField);
textField.selectAll();
this.setText(null);
}
#Override
public void cancelEdit()
{
if (!this.isEditing())
return;
System.out.println("Cell " + this.getIndex() + " - CancelEdit");
super.cancelEdit();
this.setText((String)this.getItem());
this.setGraphic(null);
}
#Override
protected void updateItem(T item, boolean empty)
{
System.out.println("Cell " + this.getIndex() + " - UpdateItem");
super.updateItem(item, empty);
if(empty || item == null)
{
if(this.getIndex() == EditStateTest.exampleList.size() - 1)
{
this.setText("");
this.setGraphic(addButton);
}
else
{
this.setText(null);
this.setGraphic(null);
}
}
else
{
// These checks are needed to make sure this cell is the specific cell that is in editing mode.
// Technically this#isEditing() can be left out, as it is not accurate enough at this point.
if(this.getTableView().getEditingCell() != null
&& this.getTableView().getEditingCell().getRow() == this.getIndex())
{
//change to TextField
this.setText(null);
this.setGraphic(textField);
}
else
{
//change to actual value
this.setText((String)this.getItem());
this.setGraphic(null);
}
}
}
#SuppressWarnings("unchecked")
public void createTextField()
{
textField.setOnKeyReleased(E -> {
System.out.println("TextField " + this.getIndex() + " - KeyEvent");
System.out.println(this.getTableView().getEditingCell());
// if(this.getTableView().getEditingCell().getRow() == this.getIndex())
if(E.getCode() == KeyCode.ENTER)
{
this.setItem((T) textField.getText());
this.commitEdit(this.getItem());
}
else if(E.getCode() == KeyCode.ESCAPE)
this.cancelEdit();
});
}
}
}
I hope somebody could help me further with this. If you have suggestions/solutions or workarounds for this, please let me know!
Thanks for your time!
This is kind of the poster child for Josh Bloch's "Inheritance breaks Encapsulation" mantra. What I mean by that is that when you create a subclass of an existing class (TableCell in this case), you need to know a lot about the implementation of that class in order to make the subclass play nicely with the superclass. You make a lot of assumptions in your code about the interaction between the TableView and its cells that are not true, and that (along with some bugs and general weird implementations of event handling in some controls) is why your code is breaking.
I don't think I can address every single issue, but I can give some general pointers here and provide what I think is working code that achieves what you are trying to achieve.
First, cells are reused. This is a good thing, because it makes the table perform very efficiently when there is a large amount of data, but it makes it complicated. The basic idea is that cells are essentially only created for the visible items in the table. As the user scrolls around, or as the table content changes, cells that are no longer needed are reused for different items that become visible. This massively saves on memory consumption and CPU time (if used properly). In order to be able to improve the implementation, the JavaFX team deliberately don't specify how this works, and how and when cells are likely to be reused. So you have to be careful about making assumptions about the continuity of the item or index fields of a cell (and conversely, which cell is assigned to a given item or index), particularly if you change the structure of the table.
What you are basically guaranteed is:
Any time the cell is reused for a different item, the updateItem() method is invoked before the cell is rendered.
Any time the index of the cell changes (which may be because an item is inserted in the list, or may be because the cell is reused, or both), the updateIndex() method is invoked before the cell is rendered.
However, note that in the case where both change, there is no guarantee of the order in which these are invoked. So, if your cell rendering depends on both the item and the index (which is the case here: you check both the item and the index in your updateItem(...) method), you need to ensure the cell is updated when either of those properties change. The best way (imo) to achieve this is to create a private method to perform the update, and to delegate to it from both updateItem() and updateIndex(). This way, when the second of those is invoked, your update method is invoked with consistent state.
If you change the structure of the table, say by adding a new row, the cells will need to be rearranged, and some of them are likely to be reused for different items (and indexes). However, this rearrangement only happens when the table is laid out, which by default will not happen until the next frame rendering. (This makes sense from a performance perspective: imagine you make 1000 different changes to a table in a loop; you don't want the cells to be recalculated on every change, you just want them recalculated once the next time the table is rendered to the screen.) This means, if you add rows to the table, you cannot rely on the index or item of any cell being correct. This is why your call to table.edit(...) immediately after adding a new row is so unpredictable. The trick here is to force a layout of the table by calling TableView.layout() after adding the row.
Note that pressing "Enter" when a table cell is focused will cause that cell to go into editing mode. If you handle commits on the text field in a cell with a key released event handler, these handlers will interact in an unpredictable way. I think this is why you see the strange key handling effects you see (also note that text fields consume the key events they process internally). The workaround for that is to use an onAction handler on the text field (which is arguably more semantic anyway).
Don't make the button static (I have no idea why you would want to do this anyway). "Static" means that the button is a property of the class as a whole, not of the instances of that class. So in this case, all the cells share a reference to a single button. Since the cell reuse mechanism is unspecified, you don't know that only one cell will have the button set as its graphic. This can cause disaster. For example, if you scroll the cell with the button out of view and then back into view, there is no guarantee the same cell will be used to display that last item when it comes back into view. It is possible (I don't know the implementation) that the cell that previously displayed the last item is sitting unused (perhaps part of the virtual flow container, but clipped out of view) and is not updated. In that case, the button would then appear twice in the scene graph, which would either throw an exception or cause unpredictable behavior. There's basically no valid reason to ever make a scene graph node static, and here it's a particularly bad idea.
To code functionality like this, you should read extensively the documentation for the cell mechanism and for TableView, TableColumn, and TableCell. At some point you might find you need to dig into the source code to see how the provided cell implementations work.
Here's (I think, I'm not sure I've fully tested) a working version of what I think you were looking for. I made some slight changes to the structure (no need for StringPropertys as the data type, String works just fine as long as you have no identical duplicates), added an onEditCommit handler, etc.
import javafx.application.Application;
import javafx.beans.value.ObservableValueBase;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.ContextMenu;
import javafx.scene.control.MenuItem;
import javafx.scene.control.TableCell;
import javafx.scene.control.TableColumn;
import javafx.scene.control.TableView;
import javafx.scene.control.TextField;
import javafx.scene.input.KeyCode;
import javafx.scene.layout.BorderPane;
import javafx.stage.Stage;
public class TableViewWithAddAtEnd extends Application {
#Override
public void start(Stage primaryStage) {
TableView<String> table = new TableView<>();
table.setEditable(true);
TableColumn<String, String> column = new TableColumn<>("Data");
column.setPrefWidth(150);
table.getColumns().add(column);
// use trivial wrapper for string data:
column.setCellValueFactory(cellData -> new ObservableValueBase<String>() {
#Override
public String getValue() {
return cellData.getValue();
}
});
column.setCellFactory(col -> new EditingCellWithMenuEtc());
column.setOnEditCommit(e ->
table.getItems().set(e.getTablePosition().getRow(), e.getNewValue()));
for (int i = 1 ; i <= 20; i++) {
table.getItems().add("Item "+i);
}
// blank for "add" button:
table.getItems().add("");
BorderPane root = new BorderPane(table);
primaryStage.setScene(new Scene(root, 600, 600));
primaryStage.show();
}
public static class EditingCellWithMenuEtc extends TableCell<String, String> {
private TextField textField ;
private Button button ;
private ContextMenu contextMenu ;
// The update relies on knowing both the item and the index
// Since we don't know (or at least shouldn't rely on) the order
// in which the item and index are updated, we just delegate
// implementations of both updateItem and updateIndex to a general
// method. This way doUpdate() is always called last with consistent
// state, so we are guaranteed to be in a consistent state when the
// cell is rendered, even if we are temporarily in an inconsistent
// state between the calls to updateItem and updateIndex.
#Override
protected void updateItem(String item, boolean empty) {
super.updateItem(item, empty);
doUpdate(item, getIndex(), empty);
}
#Override
public void updateIndex(int index) {
super.updateIndex(index);
doUpdate(getItem(), index, isEmpty());
}
// update the cell. This updates the text, graphic, context menu
// (empty cells and the special button cell don't have context menus)
// and editable state (empty cells and the special button cell can't
// be edited)
private void doUpdate(String item, int index, boolean empty) {
if (empty) {
setText(null);
setGraphic(null);
setContextMenu(null);
setEditable(false);
} else {
if (index == getTableView().getItems().size() - 1) {
setText(null);
setGraphic(getButton());
setContextMenu(null);
setEditable(false);
} else if (isEditing()) {
setText(null);
getTextField().setText(item);
setGraphic(getTextField());
getTextField().requestFocus();
setContextMenu(null);
setEditable(true);
} else {
setText(item);
setGraphic(null);
setContextMenu(getMenu());
setEditable(true);
}
}
}
#Override
public void startEdit() {
if (! isEditable()
|| ! getTableColumn().isEditable()
|| ! getTableView().isEditable()) {
return ;
}
super.startEdit();
getTextField().setText(getItem());
setText(null);
setGraphic(getTextField());
setContextMenu(null);
textField.selectAll();
textField.requestFocus();
}
#Override
public void cancelEdit() {
super.cancelEdit();
setText(getItem());
setGraphic(null);
setContextMenu(getMenu());
}
#Override
public void commitEdit(String newValue) {
// note this fires onEditCommit handler on column:
super.commitEdit(newValue);
setText(getItem());
setGraphic(null);
setContextMenu(getMenu());
}
private void addNewItem(int index) {
getTableView().getItems().add(index, "New Item");
// force recomputation of cells:
getTableView().layout();
// start edit:
getTableView().edit(index, getTableColumn());
}
private ContextMenu getMenu() {
if (contextMenu == null) {
createContextMenu();
}
return contextMenu ;
}
private void createContextMenu() {
MenuItem addNew = new MenuItem("Add new");
addNew.setOnAction(e -> addNewItem(getIndex() + 1));
MenuItem edit = new MenuItem("Edit");
// note we call TableView.edit(), not this.startEdit() to ensure
// table's editing state is kept consistent:
edit.setOnAction(e -> getTableView().edit(getIndex(), getTableColumn()));
contextMenu = new ContextMenu(addNew, edit);
}
private Button getButton() {
if (button == null) {
createButton();
}
return button ;
}
private void createButton() {
button = new Button("Add");
button.prefWidthProperty().bind(widthProperty());
button.setOnAction(e -> addNewItem(getTableView().getItems().size() - 1));
}
private TextField getTextField() {
if (textField == null) {
createTextField();
}
return textField ;
}
private void createTextField() {
textField = new TextField();
// use setOnAction for enter, to avoid conflict with enter on cell:
textField.setOnAction(e -> commitEdit(textField.getText()));
// use key released for escape: note text fields do note consume
// key releases they don't handle:
textField.setOnKeyReleased(e -> {
if (e.getCode() == KeyCode.ESCAPE) {
cancelEdit();
}
});
}
}
public static void main(String[] args) {
launch(args);
}
}
My big learn item of the day (freely summarized and slightly extended from James' answer):
view.edit(...) is safe to call only if all cells are in a stable state and the target cell is visible. Most of the time we can force the stable state by calling view.layout()
Below is yet another example to play with:
as already mentioned in one of my comments, it differs from James' in starting the edit in a listener to the items: might not always be the best place, has the advantage of a single location (at least as far as list mutations are involved) for the layout call. A drawback is that we need to be certain that the viewSkin's listener to the items is called before ours. To guarantee that, our own listener is re/registered whenever the skin changes.
as an exercise in re-use, I extended TextFieldTableCell to additionally handle the button/menu and update the cell's editability based on the row item.
there are also buttons outside the table to experiment with: addAndEdit and scrollAndEdit. The latter is to demonstrate that "instable cell state" can be reached by paths different from modifying the items.
Currently, I tend to subclass TableView and override its edit(...) to force the re-layout. Something like:
public static class TTableView<S> extends TableView<S> {
/**
* Overridden to force a layout before calling super.
*/
#Override
public void edit(int row, TableColumn<S, ?> column) {
layout();
super.edit(row, column);
}
}
Doing, relieves the burden on client code. What's left for them is to make sure the target cell is scrolled into the visible area, though.
The example:
public class TablePersonAddRowAndEdit extends Application {
private PersonStandIn standIn = new PersonStandIn();
private final ObservableList<Person> data =
// Person from Tutorial - with Properties exposed!
FXCollections.observableArrayList(
new Person("Jacob", "Smith", "jacob.smith#example.com"),
new Person("Isabella", "Johnson", "isabella.johnson#example.com"),
new Person("Ethan", "Williams", "ethan.williams#example.com"),
new Person("Emma", "Jones", "emma.jones#example.com"),
new Person("Michael", "Brown", "michael.brown#example.com")
, standIn
);
private Parent getContent() {
TableView<Person> table = new TableView<>();
table.setItems(data);
table.setEditable(true);
TableColumn<Person, String> firstName = new TableColumn<>("First Name");
firstName.setCellValueFactory(new PropertyValueFactory<>("firstName"));
firstName.setCellFactory(v -> new MyTextFieldCell<>());
ListChangeListener l = c -> {
while (c.next()) {
// true added only
if (c.wasAdded() && ! c.wasRemoved()) {
// force the re-layout before starting the edit
table.layout();
table.edit(c.getFrom(), firstName);
return;
}
};
};
// install the listener to the items after the skin has registered
// its own
ChangeListener skinListener = (src, ov, nv) -> {
table.getItems().removeListener(l);
table.getItems().addListener(l);
};
table.skinProperty().addListener(skinListener);
table.getColumns().addAll(firstName);
Button add = new Button("AddAndEdit");
add.setOnAction(e -> {
int standInIndex = table.getItems().indexOf(standIn);
int index = standInIndex < 0 ? table.getItems().size() : standInIndex;
index =1;
Person person = createNewItem("edit", index);
table.getItems().add(index, person);
});
Button edit = new Button("Edit");
edit.setOnAction(e -> {
int index = 1;//table.getItems().size() -2;
table.scrollTo(index);
table.requestFocus();
table.edit(index, firstName);
});
HBox buttons = new HBox(10, add, edit);
BorderPane content = new BorderPane(table);
content.setBottom(buttons);
return content;
}
/**
* A cell that can handle not-editable items. Has to update its
* editability based on the rowItem. Must be done in updateItem
* (tried a listener to the tableRow's item, wasn't good enough - doesn't
* get notified reliably)
*
*/
public static class MyTextFieldCell<S> extends TextFieldTableCell<S, String> {
private Button button;
public MyTextFieldCell() {
super(new DefaultStringConverter());
ContextMenu menu = new ContextMenu();
menu.getItems().add(createMenuItem());
setContextMenu(menu);
}
private boolean isStandIn() {
return getTableRow() != null && getTableRow().getItem() instanceof StandIn;
}
/**
* Update cell's editable based on the rowItem.
*/
private void doUpdateEditable() {
if (isEmpty() || isStandIn()) {
setEditable(false);
} else {
setEditable(true);
}
}
#Override
public void updateItem(String item, boolean empty) {
super.updateItem(item, empty);
doUpdateEditable();
if (isStandIn()) {
if (isEditing()) {
LOG.info("shouldn't be editing - has StandIn");
}
if (button == null) {
button = createButton();
}
setText(null);
setGraphic(button);
}
}
private Button createButton() {
Button b = new Button("Add");
b.setOnAction(e -> {
int index = getTableView().getItems().size() -1;
getTableView().getItems().add(index, createNewItem("button", index));
});
return b;
}
private MenuItem createMenuItem() {
MenuItem item = new MenuItem("Add");
item.setOnAction(e -> {
if (isStandIn()) return;
int index = getIndex();
getTableView().getItems().add(index, createNewItem("menu", index));
});
return item;
}
private S createNewItem(String text, int index) {
return (S) new Person(text + index, text + index, text);
}
}
private Person createNewItem(String text, int index) {
return new Person(text + index, text + index, text);
}
#Override
public void start(Stage primaryStage) throws Exception {
primaryStage.setScene(new Scene(getContent()));
primaryStage.setTitle(FXUtils.version());
primaryStage.show();
}
/**
* Marker-Interface to denote a class as not mutable.
*/
public static interface StandIn {
}
public static class PersonStandIn extends Person implements StandIn{
public PersonStandIn() {
super("standIn", "", "");
}
}
public static void main(String[] args) {
launch(args);
}
#SuppressWarnings("unused")
private static final Logger LOG = Logger
.getLogger(TablePersonAddRowAndEdit.class.getName());
}
Update
shouldn't have been too surprised - a related problem was discussed half a year ago (and produced a bug report)
I am trying to catch the events on the JavaFX Slider especially the one which indicates that the drag stopped and was released. At first I used the valueProperty with mock-up code like this
slider.valueProperty().addListener(new ChangeListener<Number>() {
#Override
public void changed(ObservableValue<? extends Number> ov, Number oldValue, Number newValue) {
log.fine(newValue.toString());
}
});
but with this it update too often. So I searched within SceneBuilder and the API and found some interessting like
slider.setOnMouseDragReleased(new EventHandler<MouseDragEvent>() {
#Override
public void handle(MouseDragEvent event) {
System.out.println("setOnMouseDragReleased");
}
});
but they never get fired. There only some like setOnMouseReleased I get some output, but this for example count for the whole Node like the labels etc.
So my question is, which is the correct hook to know the value is not changing anymore (if possible after release of the mouse like drag'n'drop gesture) and maybe with a small example to see its interfaces working.
Add a change listener to the slider's valueChangingProperty to know when the slider's value is changing, and take whatever action you want on the value change.
The sample below will log the slider's value when it starts to change and again when it finishes changing.
import javafx.application.Application;
import javafx.beans.value.*;
import javafx.geometry.*;
import javafx.scene.Scene;
import javafx.scene.control.*;
import javafx.scene.layout.*;
import javafx.stage.Stage;
public class SliderChangeLog extends Application {
private final ListView<String> startLog = new ListView<>();
private final ListView<String> endLog = new ListView<>();
#Override public void start(Stage stage) throws Exception {
Pane logsPane = createLogsPane();
Slider slider = createMonitoredSlider();
VBox layout = new VBox(10);
layout.setAlignment(Pos.CENTER);
layout.setPadding(new Insets(10));
layout.getChildren().setAll(
slider,
logsPane
);
VBox.setVgrow(logsPane, Priority.ALWAYS);
stage.setTitle("Slider Value Change Logger");
stage.setScene(new Scene(layout));
stage.show();
}
private Slider createMonitoredSlider() {
final Slider slider = new Slider(0, 1, 0.5);
slider.setMajorTickUnit(0.5);
slider.setMinorTickCount(0);
slider.setShowTickMarks(true);
slider.setShowTickLabels(true);
slider.setMinHeight(Slider.USE_PREF_SIZE);
slider.valueChangingProperty().addListener(new ChangeListener<Boolean>() {
#Override
public void changed(
ObservableValue<? extends Boolean> observableValue,
Boolean wasChanging,
Boolean changing) {
String valueString = String.format("%1$.3f", slider.getValue());
if (changing) {
startLog.getItems().add(
valueString
);
} else {
endLog.getItems().add(
valueString
);
}
}
});
return slider;
}
private HBox createLogsPane() {
HBox logs = new HBox(10);
logs.getChildren().addAll(
createLabeledLog("Start", startLog),
createLabeledLog("End", endLog)
);
return logs;
}
public Pane createLabeledLog(String logName, ListView<String> log) {
Label label = new Label(logName);
label.setLabelFor(log);
VBox logPane = new VBox(5);
logPane.getChildren().setAll(
label,
log
);
logPane.setAlignment(Pos.TOP_LEFT);
return logPane;
}
public static void main(String[] args) { launch(args); }
}
There could be times when you want to know when the user is moving the slider versus the slider value changing due to a binding to a property. One example is a slider that is used on a media player view to show the media timeline. The slider not only displays the time but also allows the user to fast forward or rewind. The slider is bound to the media player's current time which fires the change value on the slider. If the user moves the slider, you may want to detect the drag so as to stop the media player, have the media player seek to the new time and resume playing. Unfortunately the only drag event that seems to fire on the slider is the setOnDragDetected event. So I used the following two methods to check for a slider drag.
slider.setOnDragDetected(new EventHandler<Event>() {
#Override
public void handle(Event event) {
currentPlayer.pause();
isDragged=true;
}
});
slider.setOnMouseReleased(new EventHandler<Event>() {
#Override
public void handle(Event event) {
if(isDragged){
currentPlayer.seek(Duration.seconds((double) slider.getValue()));
currentPlayer.play();
isDragged=false;
}
}
});
jewelsea's answer was very helpful for setting me on the right track, however if "snapToTicks" is on, undesired behavior results. The "end" value as captured by jewelsea's listener is before the snap takes place, and the post-snap value is never captured.
My solution sets a listener on value but uses valueChanging as a sentinel. Something like:
slider.valueProperty().addListener(new ChangeListener<Number>() {
#Override
public void changed(
ObservableValue<? extends Number> observableValue,
Number previous,
Number now) {
if (!slider.isValueChanging()
|| now.doubleValue() == slider.getMax()
|| now.doubleValue() == slider.getMin()) {
// This only fires when we're done
// or when the slider is dragged to its max/min.
}
}
});
I found that checking for the max and min value was necessary to catch the corner case where the user drags the slider all the way past its left or right bounds before letting go of the mouse. For some reason, that doesn't fire an event like I'd expect, so this seems like an okay work-around.
Note: Unlike jewelsea, I'm ignoring the starting value for the sake of simplicity.
Note 2: I'm actually using ScalaFX 2, so I'm not sure if this Java translation compiles as-written.
Hello guys I am building a chat server where I use a textfield on the screen to type in the chat message that the user writes, the idea is that it works like a bubble over a persons head when he types a message.
my question is in order to not make a textbox that is too large or too small is there a way to make the textbox resize (trim if you will) so it adjust to the text written in the textfield?
P.S. I'm using JavaFx scenebuilder to do all of this.
You can use computeTextWidth method in the com.sun.javafx.scene.control.skin.Utils. the method is used in javafx.scene.control.Label class to calculate the minimum width for label content.
I solved my problem as below:
field.textProperty().addListener(new ChangeListener<String>() {
#Override
public void changed(ObservableValue<? extends String> ob, String o,
String n) {
// expand the textfield
field.setPrefWidth(TextUtils.computeTextWidth(field.getFont(),
field.getText(), 0.0D) + 10);
}
});
I have added a listener to textProperty, and with every text change i change the prefWidth of textfield.
Note: as long as the Utils.computeTextWidth() is not public, I have copied the source code to a new class (TextUtils).
Here is the full source code:
package me.jone30rw.fxcontrol;
import javafx.scene.text.Font;
import javafx.scene.text.Text;
import javafx.scene.text.TextBoundsType;
public class TextUtils {
static final Text helper;
static final double DEFAULT_WRAPPING_WIDTH;
static final double DEFAULT_LINE_SPACING;
static final String DEFAULT_TEXT;
static final TextBoundsType DEFAULT_BOUNDS_TYPE;
static {
helper = new Text();
DEFAULT_WRAPPING_WIDTH = helper.getWrappingWidth();
DEFAULT_LINE_SPACING = helper.getLineSpacing();
DEFAULT_TEXT = helper.getText();
DEFAULT_BOUNDS_TYPE = helper.getBoundsType();
}
public static double computeTextWidth(Font font, String text, double help0) {
// Toolkit.getToolkit().getFontLoader().computeStringWidth(field.getText(),
// field.getFont());
helper.setText(text);
helper.setFont(font);
helper.setWrappingWidth(0.0D);
helper.setLineSpacing(0.0D);
double d = Math.min(helper.prefWidth(-1.0D), help0);
helper.setWrappingWidth((int) Math.ceil(d));
d = Math.ceil(helper.getLayoutBounds().getWidth());
helper.setWrappingWidth(DEFAULT_WRAPPING_WIDTH);
helper.setLineSpacing(DEFAULT_LINE_SPACING);
helper.setText(DEFAULT_TEXT);
return d;
}
}
In JavaFX 8, there is a solution for that, here is the code:
TextField tf = new TextField();
// Set Max and Min Width to PREF_SIZE so that the TextField is always PREF
tf.setMinWidth(Region.USE_PREF_SIZE);
tf.setMaxWidth(Region.USE_PREF_SIZE);
tf.textProperty().addListener((ov, prevText, currText) -> {
// Do this in a Platform.runLater because of Textfield has no padding at first time and so on
Platform.runLater(() -> {
Text text = new Text(currText);
text.setFont(tf.getFont()); // Set the same font, so the size is the same
double width = text.getLayoutBounds().getWidth() // This big is the Text in the TextField
+ tf.getPadding().getLeft() + tf.getPadding().getRight() // Add the padding of the TextField
+ 2d; // Add some spacing
tf.setPrefWidth(width); // Set the width
tf.positionCaret(tf.getCaretPosition()); // If you remove this line, it flashes a little bit
});
});
tf.setText("Hello World!");
In JavaFX 2.2 this code works with little limitations. You can't set the Font(so if you do not use the std-font, you must set it manually).
You can't get the padding from a TextField(so if you know the padding, write it hardcoded).
Happy Coding,
Kalasch
Since JavaFX 8, this is by far the simplest:
textField.prefColumnCountProperty().bind(textField.textProperty().length());
It is time to do some coding behind the scenes(builder) :).
The following code chunk is not a neat solution but better than none. :)
// define width limits
textField.setMinWidth(50);
textField.setPrefWidth(50);
textField.setMaxWidth(400);
// add listner
textField.textProperty().addListener(new ChangeListener<String>() {
#Override
public void changed(ObservableValue<? extends String> observable, String oldValue, String newValue) {
textField.setPrefWidth(textField.getText().length() * 7); // why 7? Totally trial number.
}
});
No font dependent magic required if you use setPrefColumnCount
tf.textProperty().addListener(new ChangeListener<String>() {
#Override
public void changed(ObservableValue<? extends String> ob, String o, String n) {
tf.setPrefColumnCount(tf.getText().length() +1);
}
});
The best / easiest way to do this is to use JavaFX's "USE_COMPUTED_SIZE" option. You can either define it in the FXML, or programatically like this:
TextField textField = new TextField("hello");
textField.setPrefWidth(Control.USE_COMPUTED_SIZE);