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package com.vaadin.tests.layouts;
import com.vaadin.tests.components.TestBase;
import com.vaadin.ui.Button;
import com.vaadin.ui.GridLayout;
import com.vaadin.ui.Label;
import com.vaadin.ui.VerticalLayout;
public class GridLayoutNPE extends TestBase {
@Override
protected void setup() {
final VerticalLayout lo = new VerticalLayout();
final GridLayout gl = new GridLayout(2, 1);
gl.setSpacing(true);
final Label toRemove = new Label("First");
gl.addComponent(toRemove);
final Label toEdit = new Label("Second");
gl.addComponent(toEdit);
final Button b = new Button("remove 'First'");
final Button b2 = new Button("edit 'Second'");
b2.setVisible(false);
lo.addComponent(gl);
lo.addComponent(b);
lo.addComponent(b2);
b.addClickListener(event -> {
gl.removeComponent(toRemove);
// move another component to where the first was removed
// before rendering to the client
gl.removeComponent(toEdit);
// this could also be the result of removeAllComponents()
// followed by a loop of addComponent(c)
gl.addComponent(toEdit, 0, 0);
b.setVisible(false);
b2.setVisible(true);
});
b2.addClickListener(event -> toEdit.setValue("Second (edited)"));
addComponent(lo);
}
@Override
protected String getDescription() {
return "VGridLayout throws an NPE, causing client side to crash";
}
@Override
protected Integer getTicketNumber() {
return 4019;
}
}
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