Develop Reference

Wicket, how to get data line index number

When a user clicks on the edit link in a wicket data grid component, a new window would open and they would modify whatever appears on the new form. In the datagrid, there are many rows. How can I get the index number of the row I want to edit? Please see below, the onclick event of the “edit” link.
columnList.add(new AbstractLinkColumn<MyModel>(new Model<String>("Edit")) {
#Override
protected AbstractLink newLink(String componentId, final IModel<MyModel> rowModel) {
return new AjaxLink<String>(componentId, getDisplayModel()) {
#Override
public void onClick(AjaxRequestTarget target) {
ModalWindow myModelWindow = requestForm.getmyModelWindow();
MyPanel panel = new MyPanel(myModelWindow.getContentId(), requestForm
.getModelObject(), myModelWindow, rowModel.getObject(), false, isSetReadOnly);
myModelWindow.setContent(panel);
Ricola.refresh(target, panel);
myModelWindow.show(target);
}
};
}
#Override
protected Label newLinkLabel(String componentId, IModel<MyModel> rowModel) {
return new Label(componentId, getDisplayModel());
}
}.setTooltip(new Model<String>("Click the Edit link to edit the line")));

public class MyColumn extends AbstractColumn {
#Override
public void populateItem(Item item, String componentId, IModel model) {
Item rowItem = item.findParent(Item.class);
int rowIndex = rowItem.getIndex();
...
}
}

Container Visibility control on Change behavior of text field in Wicket 1.4

I've a container which output markup placeholder tag is set to true. I want to display it only if I digit in a certain text field a certain string. For example if I digit "show" in text field, container appears, if I digit "hide" it disappears. I made this code:
container.setOutputPlaceHolderTag(true);
container.setOuputMarkupId(true);
textfield.add(new OnChangeAjaxBehavior() {
#Override
protected void onUpdate(AjaxRequestTarget target) {
form.modelChanged();
if ("SHOW".equals(textfield.getModelObject())) {
container.setVisible(true);
} else {
container.setVisible(false);
}
target.addComponent(container);
}
this code works only if I write SHOW, BUT when I write another string it doesn't disappear. To make it disappear I've to refresh the whole form they are into (and I don't want it).
How can I solve this problem??
some details: all component I'm refering to are in a form, and only if I refresh the form setVisible(false) works. From now only setVisible(true) works, it seems the container stucks on visibility true.

This code works:
public class HomePage extends WebPage {
private static final long serialVersionUID = 1L;
private String someValue;
private WebMarkupContainer container;
public HomePage(final PageParameters parameters) {
super(parameters);
add(container = container());
add(textfield());
}
private WebMarkupContainer container() {
WebMarkupContainer wmc = new WebMarkupContainer("container") {
#Override
protected void onConfigure() {
super.onConfigure();
setVisible("SHOW".equals(someValue));
}
};
wmc.setOutputMarkupPlaceholderTag(true);
return wmc;
}
private TextField textfield() {
TextField tf = new TextField("textfield", new PropertyModel(HomePage.this, "someValue"));
tf.add(new OnChangeAjaxBehavior() {
#Override
protected void onUpdate(AjaxRequestTarget art) {
//just model update
art.add(container);
}
});
return tf;
}
}

Use
container.setOutputPlaceHolderTag(true);
container.setOuputMarkupId(true);
textfield.add(new OnChangeAjaxBehavior() {
#Override
protected void onUpdate(AjaxRequestTarget target) {
form.modelChanged();
if ("SHOW".equals(((TextField<String>) getComponent()).getModelObject())) { //change this
container.setVisible(true);
} else {
container.setVisible(false);
}
target.addComponent(container);
}
I got this tip from Getting a Wicket text box's value in an AJAX onchange event

Wicket AjaxSelfUpdatingTimerBehavior refreshes the full page when opened with 2 browser tags

I have a label that checks for new notifications every 5 seconds and updates its text to represent the current notification count by using AjaxSelfUpdatingTimeBehaviour.
All is good until I open another browser tab with the same page, then on both tabs instead of updating the label, AjaxSelfUpdatingTimeBehaviour starts refreshing the page every 5 seconds.
private void initializeNotificationPanel() {
EventNotificationService notificationService = EventNotificationService
.getInstanceOfNotificationService();
List<Event> list = notificationService
.getSubscribedEvents(MyFoodSession.get().getUser());
final User currentUser = MyFoodSession.get().getUser();
final Label countLabel;
final WebMarkupContainer wmc = new WebMarkupContainer("markupContainer");
wmc.setOutputMarkupId(true);
final ListView<Event> listView = initListView(list);
wmc.add(listView);
listView.setVisible(false);
listView.setOutputMarkupId(true);
final AjaxLink<String> notificationLink = initializeAjaxLink(wmc,
listView);
if (notificationService.hasNotifications(currentUser)) {
countLabel = new Label("countlbl", list.size());
} else {
countLabel = new Label("countlbl", "0");
}
countLabel.add(new AjaxSelfUpdatingTimerBehavior(Duration.seconds(5)) {
private static final long serialVersionUID = 1L;
EventNotificationService notificationService = EventNotificationService
.getInstanceOfNotificationService();
#Override
protected final void onPostProcessTarget(AjaxRequestTarget target) {
if (notificationService.hasNotifications(currentUser)) {
countLabel.setDefaultModelObject(""
+ notificationService.getSubscribedEvents(
MyFoodSession.get().getUser()).size());
} else {
countLabel.setDefaultModelObject("0");
}
}
});
wmc.add(notificationLink);
notificationLink.add(countLabel);
add(wmc);
}

I can't think of a reason why AjaxSelfUpdatingTimerBehavior should expose this behavior. You should create a quickstart and attache it to a new Jira issue.

GWT DialogBox that returns values back to the "opener"

I want to create a popup (implemented as a DialogBox or other similar component) which i should be able to reuse in multiple pages or forms. I want the DialogBox to be able to return a value to the "opener".
I am thinking i.e. on a DialogBox that shows a table (obtained via RPC). That DialogBox can be used in several different pages. When the user selects a row, an object is "passed back to the page" (for example, calling a method on it), so it can write it to a form field, or do whatever with it. The called doesn't know anything about the logic inside de DialogBox, only knows how to deal with the returning type.
A good example of what i'm intending to do could be a DatePicker that returns a java.util.Date.
Have you done something similiar?
I appreciate your help.
Thanks!
David

It's really easy. You should first create an interface that will be implemented by all the pages opening you DialogBox :
public interface DialogBoxOpener {
void dialogBoxValidated (Date selectedDate);
void dialogBoxCancelled ();
}
Then, create your DialogBox, and take a DialogBoxOpener as parameter to your showDialogBox method :
public class MyDialogBox extends DialogBox {
private DialogBoxOpener opener = null;
private final Button cancelButton = new Button("Cancel");
private final Button validButton = new Button("Ok");
private final DateBox myDateBox = new DateBox();
public MyDialogBox () {
cancelButton.addClickHandler(new ClickHandler () {
#Override
public void onClick(final ClickEvent event) {
hide();
if (opener!=null)
opener.dialogBoxCancelled();
}
});
validButton.addClickHandler(new ClickHandler () {
#Override
public void onClick(final ClickEvent event) {
hide();
if (opener!=null)
opener.dialogBoxValidated(myDateBox.getValue());
}
});
// TODO : create your DialogBox
}
public void showDialogBox (final DialogBoxOpener opener) {
this.opener = opener;
// Show the DialogBox
center ();
}
}
And now, you can show your DialogBox from your page :
public class MyPage implements DialogBoxOpener {
private MyDialogBox myDialogBox = getMyDialogBox();
private void openDialogBox () {
myDialogBox.showDialogBox(this);
}
public void dialogBoxValidated (Date selectedDate) {
// TODO : Do something with the date
}
public void dialogBoxCancelled () {
// TODO : Do something
}
}

java Swing -- JPanel and PropertyChangeListener

My use case is that a List<String> is passed to a Jpanel and for each String in the List, the JPanel renders a UI component. This UI component consists of 3 buttons and my current code for my given use case is as follows. -- The code for the 'UI component' follows --
public class MacroEditorEntity implements ActionListener {
private String macro;
private JButton upButton;
private JButton downButton;
private JButton MacroDetailsButton;
public MacroEditorEntity(String macro) {
this.macro = macro;
upButton = new JButton("Up");
downButton = new JButton("Down");
MacroDetailsButton = new JButton(macro);
upButton.addActionListener(this);
downButton.addActionListener(this);
MacroDetailsButton.addActionListener(this);
}
#Override
public void actionPerformed(ActionEvent evt) {
if(evt.getSource().equals(MacroDetailsButton))
{
System.out.println(macro);
}
}
public JButton GetUpButton()
{
return upButton;
}
public JButton GetDownButton()
{
return downButton;
}
public JButton getMacroDetailsButton()
{
return MacroDetailsButton;
}
}
The code for my Panel is as follows --
public class MacroEditor extends JPanel implements PropertyChangeListener {
private static final long serialVersionUID = 1L;
private List<String> stringlist;
public MacroEditor(List<String> list) {
this.stringlist = list;
setupComponents();
validate();
setVisible(true);
}
public void setupComponents()
{
Box allButtons = Box.createVerticalBox();
for(String string : stringlist)
{
MacroEditorEntity entry = new MacroEditorEntity(string);
Box entryBox = Box.createHorizontalBox();
entryBox.add(entry.GetUpButton());
entryBox.add(Box.createHorizontalStrut(15));
entryBox.add(entry.getMacroDetailsButton());
entryBox.add(Box.createHorizontalStrut(15));
entryBox.add(entry.GetDownButton());
allButtons.add(entryBox);
}
add(allButtons);
}
#Override
public void propertyChange(PropertyChangeEvent arg0) {
revalidate();
repaint();
}
}
The code works fine for all Strings in the passed List. I want my Panel to pick up any change that may happen to the List like additions or deletions and add/remove relevant corresponding UI components accordingly. I think this can be done by using PropertyChangeListener but have not been able to account for that in my code.
Any ideas or suggestions on how i can make my Panel render/rerender stuff as soon as there are changes to the List would be of help.

What you need here is an observable collection. This should do it: http://commons.apache.org/dormant/events/apidocs/org/apache/commons/events/observable/ObservableCollection.html
Edit:
Here's the code snippet you requested:
public class ObservableListExample implements StandardPostModificationListener,
StandardPreModificationListener {
public static void main(String[] args) {
new ObservableListExample();
}
public ObservableListExample() {
ObservableList list = ObservableList.decorate(new ArrayList<>(),
new StandardModificationHandler());
list.getHandler().addPostModificationListener(this);
list.getHandler().addPreModificationListener(this);
//....
}
#Override
public void modificationOccurring(StandardPreModificationEvent event) {
// before modification
Collection changeCollection = event.getChangeCollection();
if (event.isTypeAdd()) {
// changeCollection contains added elements
} else if (event.isTypeReduce()) {
// changeCollection contains removed elements
}
}
#Override
public void modificationOccurred(StandardPostModificationEvent event) {
// after modification
Collection changeCollection = event.getChangeCollection();
if (event.isTypeAdd()) {
// changeCollection contains added elements
} else if (event.isTypeReduce()) {
// changeCollection contains removed elements
}
}
}
By the way: Another concept that helps to bind buisness objects to your GUI and react to modifications (bidirectionally) is Data Binding. Have a look at this, a Data Binding Library commonly used with Swing.