Disappearing widgets

[Bo1 (Bo Thorsen)]

Hello people,

I have a problem with disappearing widgets.

I have a main window with a vertical layout containing a top toolbar and a a panel. Inside the panel, I set the current view of the application.

One of my views is a split panel subclass with a table and a form. When I show this view, the panel is just empty. All other views work fine.

If I change the main window code to put the views directly in the vertical layout instead of the panel, all views show up as intended.

Unless I have done something bad, this looks like a Vaadin bug to me.

Here is the code involved:

MainWindow:
private void setMainComponent(Component c) {

[indent]
contentPanel.replaceComponent(currentView, c);
// contentPanel.setExpandRatio(c, 1);
currentView = c;

[/indent] }

private void buildMainLayout() {

	Component toolbar = createToolbar();

	contentPanel = new Panel();
	contentPanel.setSizeFull();
	contentPanel.addStyleName("light");

	topLayout = new VerticalLayout();
	topLayout.setSizeFull();
	topLayout.addComponent(toolbar);
	topLayout.addComponent(contentPanel);
	topLayout.setExpandRatio(contentPanel, 1);

	// Show the list view as the initial view
	setMainComponent(new ListView(this));

	setContent(topLayout);

}

ListView:
public ListView(MainWindow window) {

	entryList = new Table();
	entryList.setContainerDataSource(window.getDataSource());
	entryList.addListener(new Property.ValueChangeListener() {

		private static final long serialVersionUID = 1L;

		@Override
		public void valueChange(ValueChangeEvent event) {

			Item item = entryList.getItem(entryList.getValue());
			if (item != entryForm.getItemDataSource()) {

				entryForm.setItemDataSource(item);

			}

		}

	});

	entryForm = new Form();

	setFirstComponent(entryList);
	setSecondComponent(entryForm);
	setSplitPosition(40);

}

Bug in Vaadin or in my code?

Bo.

[Dmitri (Dmitri Livotov)]

Have you tried launching your application with debug console on and using the “analyze layout” option ?

Described behavior may also happen on wrong layout sizing which is detected and displayed by the debug console layout analyzer.