Book Image

Expert Delphi

By : Paweł Głowacki
Book Image

Expert Delphi

By: Paweł Głowacki

Overview of this book

Delphi is the most powerful Object Pascal IDE and component library for cross-platform native app development. It enables building natively compiled, blazingly fast apps for all major platforms including Android, iOS, Windows, Mac, and Linux. If you want to build server-side applications, create web services, and have clear GUIs for your project, then this book is for you. The book begins with a basic primer on Delphi helping you get accustomed to the IDE and the Object Pascal language and will then quickly move on to advanced-level concepts. Through this book, we’ll help you understand the architecture of applications and will teach you the important concepts of the FireMonkey library, show you how to build server-side services, and enable you to interact with the Internet of Things. Towards the end, you will learn to integrate your app with various web services and deploy them. By the end of the book, you will be able to build powerful, cross-platform, native apps for iOS and Android with a single code base.
Table of Contents (14 chapters)

Building data-driven user interface

The data access logic has been implemented and it is available through the IToDoData interface. This should be the only way for the user interface logic to access the data. That is why we are going to implement the GetToDoData method in the main form's unit that will return the reference to the data access interface. See the following code:

uses uDMToDo; 
function TFormToDo.GetToDoData: IToDoData; 
  if DMToDo = nil then 
    DMToDo := TDMToDo.Create(Application); 
  Result := DMToDo; 

In this way, we have achieved a truly pluggable architecture. If we decide to change the underlying database access logic, database access framework, or the database platform, we only need to make sure that the new implementation implements the IToDoData interface that is available to the GUI code through the GetToDoData method.

The user interface...