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Vaadin 7 Cookbook

You're reading from   Vaadin 7 Cookbook Take the shortcut to developing rich internet applications in pure Java. Vaadin makes it easy and this cookbook makes it easier still with its practical recipes and straightforward approach.

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Product type Paperback
Published in Apr 2013
Publisher
ISBN-13 9781849518802
Length 404 pages
Edition Edition
Languages
Tools
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Toc

Table of Contents (19) Chapters Close

Vaadin 7 Cookbook
Credits
About the Authors
About the Reviewers
www.PacktPub.com
Preface
1. Creating a Project in Vaadin 2. Layouts FREE CHAPTER 3. UI Components 4. Custom Widgets 5. Events 6. Messages 7. Working with Forms 8. Spring and Grails Integration 9. Data Management 10. Architecture and Performance 11. Facilitating Development 12. Fun Index

Changing Label to TextField by double-clicking


We will create an editable Label class. It will be possible to edit this Label, because after double-clicking on it, the Label will become a TextField. After losing focus, it again becomes a Label. But how to add click listener to the Label or to a similar component that doesn't support such a listener? In those cases we can use LayoutClickListener. This listener is added to the layout in which the component is placed. It's called whenever the user clicks inside the layout.

How to do it...

Carry out the following steps to create an editable Label:

  1. We create a Vaadin project with a main UI class called Demo as follows:

    public class Demo extends UI {…}
  2. Next, we create the EditableLabel class. It extends VerticalLayout.

    public class EditableLabel extends VerticalLayout {…}
  3. Firstly, we need two variables: label and textField.

       private Label label = new Label();
       private TextField textField = new TextField();
  4. Then, we create a simple constructor. Through...

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