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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
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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

Understanding TDummy and the design-time camera

In the standard (2D) FMX environment, we are used to having TLayout instances acting as invisible containers. This lets the developer easily position and size objects (or groups of them) to achieve responsive UIs (as we discussed in Chapter 9, Building Responsive UIs). TLayout instances are invisible at runtime (and to the end user), yet they can be used to group other components and implement relative positioning and sizing. TDummy is the equivalent of TLayout in the 3D conception.

A TDummy component has a cubic shape and its boundaries are rendered only at design time. You can nest as many instances of TDummy as you like and you can size them as you prefer. They also can host other components and the contained component(s) will be relative to the container in terms of position, rotation, visibility, and other qualities (opacity, for example).

It is quite common to use a TDummy instance as the parent of all other components in the...

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