uitest/src/main/java/com/vaadin/tests/application/MissingHierarchyDetection.java


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package com.vaadin.tests.application;

import com.vaadin.server.VaadinRequest;
import com.vaadin.tests.components.AbstractReindeerTestUIWithLog;
import com.vaadin.ui.Button;
import com.vaadin.ui.Component;
import com.vaadin.ui.CssLayout;
import com.vaadin.ui.Label;
import com.vaadin.ui.SelectiveRenderer;

public class MissingHierarchyDetection extends AbstractReindeerTestUIWithLog {

    private boolean isChildRendered = true;
    private BrokenCssLayout brokenLayout = new BrokenCssLayout();

    private CssLayout normalLayout = new CssLayout(
            new Label("Normal layout child"));

    public class BrokenCssLayout extends CssLayout
            implements SelectiveRenderer {
        public BrokenCssLayout() {
            setCaption("Broken layout");
            Label label = new Label("Child component");
            label.setId("label");
            addComponent(label);
        }

        @Override
        public boolean isRendered(Component childComponent) {
            return isChildRendered;
        }
    }

    @Override
    protected void setup(VaadinRequest request) {
        addComponent(brokenLayout);
        addComponent(normalLayout);
        addComponent(new Button("Toggle properly", event -> toggle(true)));
        addComponent(new Button("Toggle improperly", event -> toggle(false)));
    }

    private void toggle(boolean properly) {
        isChildRendered = !isChildRendered;
        if (properly) {
            brokenLayout.markAsDirtyRecursive();
        }

        normalLayout.getComponent(0).setVisible(isChildRendered);
        // Must also have a state change of the layout to trigger special case
        // related to optimizations
        normalLayout.setCaption("With child: " + isChildRendered);
    }
}