Examples of com.vaadin.ui.Component$Event

com.vaadin.ui.Component
Superclass of all component originated events.
Events are the basis of all user interaction handling in Vaadin. To handle events, you provide a listener object that receives the events of the particular event type.
```
 Button button = new Button("Click Me!"); button.addListener(new Button.ClickListener() { public void buttonClick(ClickEvent event) { getWindow().showNotification("Thank You!"); } }); layout.addComponent(button); 
```
Notice that while each of the event types have their corresponding listener types; the listener interfaces are not required to inherit the {@code Component.Listener} interface.
@see Component.Listener

    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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