Book Image

qooxdoo Beginner's Guide

Book Image

qooxdoo Beginner's Guide

Overview of this book

Over the past few years, all the major internet or enterprise applications are developed or migrated to Rich Internet Application to support all the features that are provided in the desktop applications. This helps organizations keep the end users happy and also improves application deployment and maintenance. qooxdoo is a stable, open source RIA framework. If you are waiting and watching for the right time to migrate your application to qooxdoo, this is the right time!This book explains in detail about the rich user interface development in qooxdoo. It explains various concepts of qooxdoo framework in an easy to grasp and organized way, making it simple even for a novice in qooxdoo and also increases the competency level of the developer who is already working in qooxdoo.This book helps developers understand the qooxdoo framework, setup the environment, and start the development of RIA using qooxdoo. You will learn the core programming techniques in qooxdoo, user interface development in qooxdoo, testing & debugging qooxdoo applications, internationalization of qooxdoo applications to multiple languages, customizing the look and feel of qooxdoo applications using Themes, Performance management, etc.In the course of the book, we develop a complete application which will help the developer to understand the concepts better and to put things together to see the step-by-step progress to complete an application. By the end, this book will get the developer accustomed to the widgets and API available in the qooxdoo framework, and will enable him to design, develop, debug, and test the RIA in qooxdoo.
Table of Contents (19 chapters)
qooxdoo
Credits
About the Authors
About the Reviewers
www.PacktPub.com
Preface
References

Layout managers


Layout managers control the position, size, and arrangement of all the widgets inside the container. The qooxdoo framework provides different layout managers for different purposes, for example, to arrange widgets horizontally or vertically, to place the widgets in rows and columns such as in a grid, to place the widgets at the corners, to place the widgets at fixed points, and so on.

When a user resizes the web page, the qooxdoo layout engine prompts the layout manager to recalculate and reposition the widgets in the container.

The different criteria or properties involved in laying out the screen are discussed in the sections that follow.

Size hint of the widget and its parent widget

Size hint is nothing but a map of boundaries, widths, and heights, and it's been calculated based on the widgets' internal widgets. qooxdoo provides two different methods to calculate and get the size hints of a widget, mentioned next:

  • getSizeHint(Boolean compute): This default value for compute...