Delphi Cookbook - Third Edition

Getting ready...

What exactly does the cross-platform TMessageManager class do? Put simply, it allows you to listen for events and assign actions to run when those events occur. Just like in VCL or FireMonkey, you know about mouse and keyboard events that occur on certain user interactions. These are very similar, except that we can emit events (or send messages) on our own, when we want to, and not necessarily based on user interaction or other mechanisms inside other components. TMessageManager is based on the publish/subscribe model because we can subscribe to a particular type of message and then publish it.

The other important question is this—Why would you use the event model? You already know that, in Delphi, the event model allows ...