Book Image

Delphi GUI Programming with FireMonkey

By : Andrea Magni
Book Image

Delphi GUI Programming with FireMonkey

By: Andrea Magni

Overview of this book

FireMonkey (FMX) is a cross-platform application framework that allows developers to create exciting user interfaces and deliver applications on multiple operating systems (OS). This book will help you learn visual programming with Delphi and FMX. Starting with an overview of the FMX framework, including a general discussion of the underlying philosophy and approach, you’ll then move on to the fundamentals and architectural details of FMX. You’ll also cover a significant comparison between Delphi and the Visual Component Library (VCL). Next, you’ll focus on the main FMX components, data access/data binding, and style concepts, in addition to understanding how to deliver visually responsive UIs. To address modern application development, the book takes you through topics such as animations and effects, and provides you with a general introduction to parallel programming, specifically targeting UI-related aspects, including application responsiveness. Later, you’ll explore the most important cross-platform services in the FMX framework, which are essential for delivering your application on multiple platforms while retaining the single codebase approach. Finally, you’ll learn about FMX’s built-in 3D functionalities. By the end of this book, you’ll be familiar with the FMX framework and be able to build effective cross-platform apps.
Table of Contents (18 chapters)
Section 1: Delphi GUI Programming Frameworks
Section 2: The FMX Framework in Depth
Section 3: Pushing to The Top: Advanced Topics

Pull to refresh

One of the most universally accepted UI patterns on mobile devices involves the way in which the user can call for a data refresh, that is, pull down on the screen with a finger and have some visual feedback linked to the actual gesture of the user. If a threshold is reached, update the content and hide the visual feedback.

This kind of interaction is very common in a wide variety of applications (mail, social networks, and more) and can be applied to lists, grids, and other controls. The TListView component makes it very easy to implement this behavior, which is, in fact, built in and, on mobile platforms, can have some native integrations (that is, platform-specific animations). To enable pull-to-refresh (which is off by default), you can set the PullToRefresh property of TListView to True and implement the OnPullRefresh event handler.

In the following screenshot, you can see the steps involved in a pull-to-refresh interaction...