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Delphi GUI Programming with FireMonkey

You're reading from   Delphi GUI Programming with FireMonkey Unleash the full potential of the FMX framework to build exciting cross-platform apps with Embarcadero Delphi

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Product type Paperback
Published in Oct 2020
Publisher Packt
ISBN-13 9781788624176
Length 546 pages
Edition 1st Edition
Languages
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Author (1):
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Andrea Magni Andrea Magni
Author Profile Icon Andrea Magni
Andrea Magni
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Table of Contents (18) Chapters Close

Preface 1. Section 1: Delphi GUI Programming Frameworks
2. Introducing the FireMonkey Framework FREE CHAPTER 3. Exploring Similarities and Differences with VCL 4. Section 2: The FMX Framework in Depth
5. Mastering Basic Components 6. Discovering Lists and Advanced Components 7. Using FireDAC in FMX Applications 8. Implementing Data Binding 9. Understanding FMX Style Concept 10. Divide and Conquer with TFrameStand 11. Building Responsive UIs 12. Orchestrating Transitions and Animations 13. Section 3: Pushing to The Top: Advanced Topics
14. Building Responsive Applications 15. Exploring Cross-Platform Services 16. Learning about FMX 3D Capabilities 17. Other Books You May Enjoy

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...

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