November 2019
Beginner to intermediate
674 pages
15h
English
Content preview from Mastering Delphi Programming: A Complete Reference Guide
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Client
All of this comes together in the client. Besides creating and dispatching commands, the client also provides a user interface for undoing last action and an interface for recording and playing macros, as shown in the following screenshot:
Command-driven editor
All of the user interfaces in this program are action-driven. Every button has a corresponding action with Update and Execute event handlers attached. This allows the program to enable/disable buttons according to the current program's state.
Delphi's TAction object is in fact, an implementation of the command design pattern!
As we can see in the following code, the actUndo ...
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.