Summary

In this chapter, we learned how to create a new Lazarus package and add a new component to that using the New Package dialog window to create our own custom component, TMessageLog. We also learned about compiling and installing a new component into the IDE, which requires Lazarus to rebuild itself in order to do so. Moreover, we discussed component properties. Then, we became acquainted with the events, which are triggered by any interaction that a user has with a component, such as clicking it, or by a system response, which could be caused by the change in any component of a form that affects another component. We studied that Events are properties, and they are handled through a technique called delegation. We discovered the simplest way to create an event is to create a descendant of TNotifyEvent—if you needed to send more parameters to an event and a single parameter provided by TNotifyEvent, then you need to declare a method pointer.

We learned that property editors are custom...