Book Image

Delphi GUI Programming with FireMonkey

By : Andrea Magni
4 (1)
Book Image

Delphi GUI Programming with FireMonkey

4 (1)
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

Exploring CustomFormat/CustomParse expressions

Let's provide some background information about the CustomFormat format (note that CustomFormat and CustomParse are twin properties). As an example scenario, we'll keep our Salary field bound to the Edit1 button:

  • The CustomFormat format's default value is an empty string. The value is not formatted and is sent to the other end of the binding as is (this is the same value you would get by accessing the TField.AsString value).
  • The following are the conventions and peculiarities of the expression:
    • %s is a placeholder for the textual representation of the current data value.
    • Value is a reference to the underlying TField.Value of the field that's associated through the binding. Its type is Variant.
    • Self is a reference to the underlying TField associated with the binding.
    • The expression engine supports dot notation, method invocation, and property access (including indexed ones), which...