Book - Vaadin7

Vaadin 6 / 7 / 8
1

The Vaadin 7 book for CustomComponent has Panel.addComponent. I believe it is not supported in Vaadin 7

2

What do you mean by “is not supported”?

panel.addcomponent(“”) references a component of type panel named “panel”.

Is the code you mean this?

        Panel panel = new Panel("My Custom Component");
        panel.setContent(new VerticalLayout());
        
        // Compose from multiple components
        Label label = new Label(message);
        label.setSizeUndefined(); // Shrink
        panel.addComponent(label);
        panel.addComponent(new Button("Ok"));

panel.addComponent has nothing to do with the CustomComponent class.
In the code snippet it creates a new component of type Panel and adds a label and button to it.
After that it sets the Composition-Root of the CustomComponent to the panel which means that now the class holds holds the panel and all it’s children.

“Typically, you simply combine existing built-in components to produce composite components.”

So when you do something like this in another class: MyComposite comp = new MyComposite(); someLayout.addComponent.addComponent(comp); It adds the panel + button + label… to the somelayout.

3

In Vaadin 7, Panel is a SingleComponentContainer and you should use setContent() instead of addComponent.

4

There’s still some outdated examples, fixing them one by one. Thanks for noting, fixing that one right away.