Editable JavaFx ComboBoxes works well but the left-arrow key is interpreted as Shift-TAB.
As you can see the focus is set to the ComboBox and the insertion point is in the middle of its field. Pressing the left arrow key move the focus to the first control, the TextField on the left of the image when pressing right arrow key move the insertion one character right as expected like in any TextField.
How can I catch events to reproduce the behavior of a TextField in an editable ComboBox?
I've tried to catch key events via ComboBox.setOnKeyPressed() and event.consume() but without success.
Here is a minimal program to reproduce this unexpected behavior:
#Override
public void start( Stage stage ) {
stage.setTitle( "Editable ComboBox and left-arrow key" );
ComboBox<String> cmbBx = new ComboBox<>();
cmbBx.getItems().addAll( "A", "B", "C", "D", "E" );
cmbBx.setMinWidth( 150 );
cmbBx.setEditable( true );
cmbBx.setOnKeyPressed( new EventHandler<KeyEvent>(){
#Override public void handle( KeyEvent event ) {
System.err.println( event );
event.consume(); }}); // Consuming left arrow key is inoperant
GridPane grid = new GridPane();
grid.setVgap( 4 );
grid.setHgap( 4 );
grid.setPadding( new Insets( 4, 4, 4, 4 ));
grid.add( new Label( "TextField:" ), 0, 0 );
grid.add( new TextField() , 1, 0 );
grid.add( new Label( "ComboBox:" ) , 2, 0 );
grid.add( cmbBx , 3, 0 );
stage.setScene( new Scene( grid ));
stage.show();
}
The answer is around key bindings like shown in this SO post "key bindings in javafx".
This code catch the LEFT event:
cmbBx.addEventFilter( KeyEvent.ANY, new EventHandler< KeyEvent >() {
#Override public void handle(KeyEvent event ) {
if( event.getCode() == KeyCode.LEFT ) {
event.consume(); }}});
And that's all, but I'm surprised because the left arrow key move the insertion point as expected, only the undesired behavior is removed. Why?
Related
Say I am making a program that keeps track of people's favorite food. I have a dropdown, as such:
String foods = { "Pizza", "Burgers", "Pasta", "Bacon" };
String favoriteFood = JOptionPane.showInputDialog(null, "What is your favorite food?", "Choice", JOptionPane.QUESTION_MESSAGE, null, foods, foods[0]));
JOptionPane.showMessageDialog(null, favoriteFood);
How do I make a part in the dropdown that is like "Choose now...", but if you click the "Choose now...", it doesn't become your choice? Thank you!
You may do it like this
String[] foods = { "Pizza", "Burgers", "Pasta", "Bacon" };
JComboBox<String> cb = new JComboBox<String>(foods);
cb.getModel().setSelectedItem("Choose now...");
cb.addHierarchyListener(hEv -> {
if((hEv.getChangeFlags() & HierarchyEvent.SHOWING_CHANGED) != 0 && cb.isShowing()) {
JButton ok = SwingUtilities.getRootPane(cb).getDefaultButton();
ok.setEnabled(cb.getSelectedIndex() >= 0);
cb.addActionListener(aEv -> ok.setEnabled(cb.getSelectedIndex() >= 0));
} });
JPanel p = new JPanel(new GridLayout(0, 1, 0, 8));
p.add(new JLabel("What is your favorite food?"));
p.add(cb);
int choice = JOptionPane.showConfirmDialog(null,
p, "Choice", JOptionPane.OK_CANCEL_OPTION, JOptionPane.QUESTION_MESSAGE);
JOptionPane.showMessageDialog(null,
choice == JOptionPane.OK_OPTION? cb.getSelectedItem(): "no choice");
The first challenge is to set a (pre)selected value that is not part of the selectable choices. When you call setSelectedItem on a non-editable JComboBox, it will reject any values outside the model. However, we can set the selected value on the model directly, like in cb.getModel().setSelectedItem("Choose now...");
Then, to ensure that we won’t confuse this initial selection with an actual selection, we have to disable the “Ok” button until a choice from the list has been made (cb.getSelectedIndex() >= 0). To get the “Ok” button itself, we wait until the entire AWT hierarchy has been constructed and get the default button.
A possible solution using the JOptionPane is shown below. In this code the JDialog is more or less manually created. The OK button and available options are then pulled from the JOptionPane and the OK button is only enabled when anything other than 'Choose from...' is selected.
String[] foods = new String[]{"Choose now...", "Pizza", "Burgers", "Pasta", "Bacon"};
JOptionPane pane = new JOptionPane("What is your favorite food?", JOptionPane.QUESTION_MESSAGE,
JOptionPane.OK_CANCEL_OPTION, null,
null, null);
pane.setWantsInput(true);
pane.setSelectionValues(foods);
pane.setInitialSelectionValue(foods[0]);
// create the dialog and select the initial value
JDialog dialog = pane.createDialog( null, "title" );
pane.selectInitialValue();
// find the OK Button and disable it by default
JPanel buttonPanel = (JPanel) pane.getComponent( 1 );
JButton ok = (JButton) buttonPanel.getComponent( 0 );
ok.setEnabled( false );
// find the JComboBox (the panel holding the available options)
JPanel childPanel = (JPanel) ((JPanel) pane.getComponent( 0 )).getComponent( 0 );
JPanel innerPanel = (JPanel) childPanel.getComponent( 1 );
JComboBox options = (JComboBox) innerPanel.getComponent( 1 );
// add an action listener to the JComboBox; enable the OK button if a valid option is selected
options.addActionListener(new ActionListener() {
#Override
public void actionPerformed(ActionEvent e) {
if ( options.getSelectedIndex() == 0 ) {
ok.setEnabled( false );
} else {
ok.setEnabled( true );
}
}
});
// show the dialog
dialog.show(); // <--- note this one is deprecated, should probably use: dialog.setVisible( true );
dialog.dispose();
// get the selected value
String value = pane.getInputValue().toString();
I am using a logarithmic scale for a graph and I want to be able to make the individual curves a little wider when hovered over and on top of all the other curves as well as the color key's value too. Below is a picture better illustrating what I want to do (with sensitive data redacted)
Is something like this even possible? And if so what direction should I move in to achieve this?
The first of your cases, which is applying the visual changes when the mouse hovers over the curve, is possible by modifying the Node that represents the Series on the chart, which is a Path. You can apply the changes to the stroke of the Path making it darker, wider and bringing in to the front when the mouse enters and reverting them when the mouse leaves
The second, which is applying the visual changes when hovering over the legend items is still possible but it's not as clean a solution, at least it's not in my implementation below. With a Node lookup you can get the items and cast them to either a Label or a LegendItem which expose the graphic and text. I chose Label to avoid using the internal API
See more here: It is a bad practice to use Sun's proprietary Java classes?
With String comparisons between the legend text and series names you can associate the two assuming each series has a name and that it is unique. If it isn't unique you could compare the stroke fills as well as the names
Important: These assumptions limit this approach and so if possible I'd avoid it
SSCCE:
public class DarkerSeriesOnHoverExample extends Application {
#SuppressWarnings("unchecked")
#Override
public void start(Stage primaryStage) throws Exception {
//LogarithmicNumberAxis source: https://stackoverflow.com/a/22424519/5556314
LineChart lineChart = new LineChart(new LogarithmicNumberAxis(1, 1000000), new NumberAxis(0, 2.25, 0.25));
lineChart.setCreateSymbols(false);
//Values guessed from the screen shot
ObservableList<XYChart.Data> seriesData = FXCollections.observableArrayList(new XYChart.Data(1, 2),
new XYChart.Data(10, 2), new XYChart.Data(100, 2), new XYChart.Data(1000, 1.85),
new XYChart.Data(10000, 1.50), new XYChart.Data(100000, 1.20), new XYChart.Data(1000000, 0.9));
ObservableList<XYChart.Data> series2Data = FXCollections.observableArrayList(new XYChart.Data(1, 2),
new XYChart.Data(10, 2), new XYChart.Data(100, 2), new XYChart.Data(1000, 1.60),
new XYChart.Data(10000, 1.25), new XYChart.Data(100000, 0.95), new XYChart.Data(1000000, 0.65));
ObservableList<XYChart.Data> series3Data = FXCollections.observableArrayList(new XYChart.Data(1, 2),
new XYChart.Data(10, 1.85), new XYChart.Data(100, 1.55), new XYChart.Data(1000, 1),
new XYChart.Data(10000, 0.65), new XYChart.Data(100000, 0.5), new XYChart.Data(1000000, 0.45));
ObservableList<XYChart.Series> displayedSeries = FXCollections.observableArrayList(
new XYChart.Series("Series 1", seriesData), new XYChart.Series("Series 2", series2Data),
new XYChart.Series("Series 3", series3Data));
lineChart.getData().addAll(displayedSeries);
Scene scene = new Scene(lineChart, 300, 300);
primaryStage.setScene(scene);
primaryStage.show();
darkenSeriesOnHover(displayedSeries); //Setup for hovering on series (cleaner)
darkenSeriesOnLegendHover(lineChart); //Setup both hovering on series and legend (messier)
}
private void darkenSeriesOnHover(List<XYChart.Series> seriesList){
for(XYChart.Series series : seriesList){
Node seriesNode = series.getNode();
//seriesNode will be null if this method is called before the scene CSS has been applied
if(seriesNode != null && seriesNode instanceof Path){
Path seriesPath = (Path) seriesNode;
Color initialStrokeColor = (Color)seriesPath.getStroke();
double initialStrokeWidth = seriesPath.getStrokeWidth();
seriesPath.setOnMouseEntered(event -> {
updatePath(seriesPath, initialStrokeColor.darker(), initialStrokeWidth*2, true);
});
seriesPath.setOnMouseExited(event -> {
//Reset
updatePath(seriesPath, initialStrokeColor, initialStrokeWidth, false);
});
}
}
}
private void darkenSeriesOnLegendHover(LineChart lineChart){
Set<Node> legendItems = lineChart.lookupAll("Label.chart-legend-item");
List<XYChart.Series> seriesList = lineChart.getData();
//Will be empty if this method is called before the scene CSS has been applied
if(legendItems.isEmpty()){ return; }
for(Node legendItem : legendItems){
Label legend = (Label) legendItem;
XYChart.Series matchingSeries = getMatchingSeriesByName(seriesList, legend.getText());
if(matchingSeries == null){ return; }
Node seriesNode = matchingSeries.getNode();
//seriesNode will be null if this method is called before the scene CSS has been applied
if(seriesNode != null && seriesNode instanceof Path){
Path seriesPath = (Path) seriesNode;
Color initialStrokeColor = (Color)seriesPath.getStroke();
double initialStrokeWidth = seriesPath.getStrokeWidth();
legendItem.setOnMouseEntered(event -> {
updatePath(seriesPath, initialStrokeColor.darker(), initialStrokeWidth*2, true);
});
legendItem.setOnMouseExited(event -> {
//Reset
updatePath(seriesPath, initialStrokeColor, initialStrokeWidth, false);
});
seriesPath.setOnMouseEntered(event -> {
updatePath(seriesPath, initialStrokeColor.darker(), initialStrokeWidth*2, true);
});
seriesPath.setOnMouseExited(event -> {
//Reset
updatePath(seriesPath, initialStrokeColor, initialStrokeWidth, false);
});
}
}
}
private void updatePath(Path seriesPath, Paint strokeColor, double strokeWidth, boolean toFront){
seriesPath.setStroke(strokeColor);
seriesPath.setStrokeWidth(strokeWidth);
if(!toFront){ return; }
seriesPath.toFront();
}
private XYChart.Series getMatchingSeriesByName(List<XYChart.Series> seriesList, String searchParam){
for (XYChart.Series series : seriesList){
if(series.getName().equals(searchParam)){
return series;
}
}
return null;
}
}
Output:
Before vs Hover
I've got a little problem with my JavaFX code. I'm sure you all know that you can get the input from a TextInputDialog with an Optional< String > and .showAndWait(). But what should I do when I have a custom dialog with multiple TextFields and a ChoiceBox? How do I get the results from all of them when clicking OK? I thought about a List<String> but I didn't manage to do it..
Code (Custom Dialog):
public class ImageEffectInputDialog extends Dialog {
private ButtonType apply = new ButtonType("Apply", ButtonBar.ButtonData.OK_DONE);
private ButtonType cancel = new ButtonType("Cancel", ButtonBar.ButtonData.CANCEL_CLOSE);
public ImageEffectInputDialog(String title) {
setTitle(title);
setHeaderText(null);
GridPane dPane = new GridPane();
Label offsetX = new Label("Offset X: ");
Label offsetY = new Label("Offset Y: ");
Label color = new Label("Shadow Color: ");
TextField offsetXText = new TextField();
TextField offsetYText = new TextField();
ChoiceBox<String> shadowColors = new ChoiceBox<>();
shadowColors.getItems().add(0, "Black");
shadowColors.getItems().add(1, "White");
dPane.setHgap(7D);
dPane.setVgap(8D);
GridPane.setConstraints(offsetX, 0, 0);
GridPane.setConstraints(offsetY, 0, 1);
GridPane.setConstraints(offsetXText, 1, 0);
GridPane.setConstraints(offsetYText, 1, 1);
GridPane.setConstraints(color, 0, 2);
GridPane.setConstraints(shadowColors, 1, 2);
dPane.getChildren().addAll(offsetX, offsetY, color, offsetXText, offsetYText, shadowColors);
getDialogPane().getButtonTypes().addAll(apply, cancel);
getDialogPane().setContent(dPane);
}
}
Code (where I want the results)
if(scrollPane.getContent() != null && scrollPane.getContent() instanceof ImageView) {
// ImageEffectUtil.addDropShadow((ImageView) scrollPane.getContent());
ImageEffectInputDialog drop = new ImageEffectInputDialog("Drop Shadow");
//Want the Results here..
}
I hope someone might be able to help.
First of all, in order to obtain different values of different types (generic solution) just define a new data structure, say Result, which contains fields like offsetX, offsetY and whatever else you need. Next, extend Dialog<Result> instead of just Dialog. Finally, in the constructor of your ImageEffectInputDialog you need to set result converter, as follows:
setResultConverter(button -> {
// here you can also check what button was pressed
// and return things accordingly
return new Result(offsetXText.getText(), offsetYText.getText());
});
Now wherever you need to use the dialog, you can do:
ImageEffectInputDialog dialog = new ImageEffectInputDialog("Title");
dialog.showAndWait().ifPresent(result -> {
// do something with result object, which is of type Result
});
I am writing an Eclipse plugin(And RCP application) using SWT. In one of the views, I have 4 tabs and in couple of tabs I have many composites created with different textbox, checkbox and combobox(Tablecombo) controls. In one of the tab page, I get the org.eclipse.swt.SWTError: No more handles error. I read through multiple forum posts and see that this might be a resource leak but I am not sure how to find it in the RCP application. Also if I write a small test to create 10000 composites, I get the same SWT No more handles error.
Here is the code
public static void main( String[] args )
{
Display display = new Display();
Shell shell = new Shell( display );
shell.setBounds( 10, 10, 350, 200 );
shell.setLayout( new FillLayout() );
for ( int i = 0; i < 10000; i++ )
{
Composite comp = new Composite( shell, SWT.NONE );
}
shell.open();
while ( !shell.isDisposed() )
{
if ( !display.readAndDispatch() )
display.sleep();
}
display.dispose();
}
I've a Window which contains two ContentPanel (horizontally), one with a Image into it and the other one with some text. The problem is that my text is truncated : it's going out of the Window...
Window win = new Window();
win.setLayout( new FillLayout() );
win.setMinWidth( 250 );
win.setHeight( 120 );
ContentPanel content = new ContentPanel( new RowLayout( Orientation.HORIZONTAL ) );
ContentPanel iconePanel = new ContentPanel( new FillLayout() );
iconePanel.add(myImage);
content.add( iconePanel, new RowData( 48, 1 ) );
Text textPanel = new Text();
textPanel.setText( msg );
content.add( textPanel, new RowData( -1, 1 ) );
win.add( content );
win.show();
How can I keep the text in the panel?
Its necessary that you should have a good understanding of different panels in the GXT,There is another trick by adjusting the padding size,Its better you use a firebug and adjust the Layout using Firebug,it will help a lot for adjusting the window.