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

TGrid and TStringGrid

TGrid and TStringGrid are very similar from the functionality point of view, but there is a significant difference in terms of the data to be displayed; that is, TGrid does not hold the data it is showing. To provide data for each cell, you must implement the OnGetValue event handler.

This handler will be called each time the grid needs a value for a cell, but it will not actually be stored within the grid. There is a caching mechanism to improve performance and avoid multiple unnecessary requests to the OnGetValue implementation, but the cache only contains data for the visible cells and it is cleared as soon as the cell goes beyond the scope of visibility. If you need to solicit the grid to refresh data shown to the user, you will have to instruct the grid model that some data has changed. The following code block shows a simple implementation of the OnGetValue event handler, providing (mostly random) values for a grid with three...