Examples of com.vaadin.ui.Component

com.vaadin.ui.Component
{@code Component} is the top-level interface that is and must be implementedby all Vaadin components. {@code Component} is paired with{@link AbstractComponent}, which provides a default implementation for all the methods defined in this interface.
Components are laid out in the user interface hierarchically. The layout is managed by layout components, or more generally by components that implement the {@link ComponentContainer} interface. Such a container is theparent of the contained components.

The {@link #getParent()} method allows retrieving the parent component of acomponent. While there is a {@link #setParent(Component) setParent()}, you rarely need it as you normally add components with the {@link ComponentContainer#addComponent(Component) addComponent()} method ofthe layout or other {@code ComponentContainer}, which automatically sets the parent.

A component becomes attached to an application (and the {@link #attach()} is called) when it or one of its parents is attached to themain window of the application through its containment hierarchy.
@author IT Mill Ltd. @version 6.7.1 @since 3.0

    protected Component createTestComponent(
            Class<? extends AbstractComponentTest> cls) {
        try {
            AbstractComponentTest t = cls.newInstance();
            t.init();
            Component c = t.getMainWindow().getContent();
            t.getMainWindow().setContent(null);
            return c;
        } catch (InstantiationException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();

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        Class<?>[] components = { Button.class, CheckBox.class,
                DateField.class, NativeButton.class, Link.class, Label.class,
                Panel.class, Slider.class, TextArea.class, TextField.class,
                Upload.class };
        for (Class<?> clazz : components) {
            Component c;
            try {
                c = (Component) clazz.newInstance();
            } catch (Exception e) {
                e.printStackTrace();
                continue;
            }
            c.setCaption(clazz.getSimpleName());
            c.setIcon(icon);
            gl.addComponent(c);
        }


        // TabSheet, caption + tab icons
        TabSheet tabs = new TabSheet();

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    }


    @Test
    public void addComponent() {
        TestUI ui = new TestUI();
        Component c = new Label("abc");


        ui.addComponent(c);


        assertSame(c.getParent(), ui.iterator().next());
        assertSame(c, ui.getContent().iterator().next());
        assertEquals(1, ui.getComponentCount());
        assertEquals(1, ui.getContent().getComponentCount());
    }

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    }


    @Test
    public void removeComponent() {
        TestUI ui = new TestUI();
        Component c = new Label("abc");


        ui.addComponent(c);


        ui.removeComponent(c);

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    }


    @Test
    public void replaceComponent() {
        TestUI ui = new TestUI();
        Component c = new Label("abc");
        Component d = new Label("def");


        ui.addComponent(c);


        ui.replaceComponent(c, d);


        assertSame(d.getParent(), ui.iterator().next());
        assertSame(d, ui.getContent().iterator().next());
        assertEquals(1, ui.getComponentCount());
        assertEquals(1, ui.getContent().getComponentCount());
    }

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public class TestTabSheet {


    @Test
    public void addExistingComponent() {
        Component c = new Label("abc");
        TabSheet tabSheet = new TabSheet();
        tabSheet.addComponent(c);
        tabSheet.addComponent(c);


        Iterator<Component> iter = tabSheet.getComponentIterator();

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        assertNotNull(tabSheet.getTab(c));
    }


    @Test
    public void getComponentFromTab() {
        Component c = new Label("abc");
        TabSheet tabSheet = new TabSheet();
        Tab tab = tabSheet.addTab(c);
        assertEquals(c, tab.getComponent());
    }

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    public void testOrderedLayoutAttachListener() {
        // Reset state variables
        resetVariables();


        // Add component -> Should trigger attach listener
        Component comp = new Label();
        olayout.addComponent(comp);


        // Attach counter should get incremented
        assertEquals(1, attachCounter);

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        assertFalse(indexOfComponent == -1);
    }


    public void testOrderedLayoutDetachListener() {
        // Add a component to detach
        Component comp = new Label();
        olayout.addComponent(comp);


        // Reset state variables (since they are set by the attach listener)
        resetVariables();

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    public void testGridLayoutAttachListener() {
        // Reset state variables
        resetVariables();


        // Add component -> Should trigger attach listener
        Component comp = new Label();
        gridlayout.addComponent(comp);


        // Attach counter should get incremented
        assertEquals(1, attachCounter);

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