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Component Development: Publishing events from ancestors

Posted on August 23, 2016 by by Holger Flick Posted in Delphi

When developing a new component and deriving from TGraphicControl the list of events in the Object Inspector looks rather empty.

Does this mean we have to implement any user interaction like OnDblClick or OnClick ourselves?

If we look closer at the ancestor TControl we clearly find the definition of the events:

property OnCanResize: TCanResizeEvent
read FOnCanResize write FOnCanResize;…

Flexibility of VCL and FMX programming …using events or properties

Posted on July 19, 2016 by by Holger Flick Posted in Delphi

The following example might seem rather trivial, but I could not help but think about if there was a downside to any of the two….

Here’s the example: I have a grid that allows the data in it to be edited. Furthermore, I added a checkbox to the form that is to make the grid read only when checked:

gridreadonly

Reason for this is that I do not want to get into edit mode by accident.

…

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Component Development: Publishing events from ancestors

Flexibility of VCL and FMX programming …using events or properties

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