Merlin’s Delphi Forge

When creating components you may want to know when the user changed the font or text. This can be quite easily done using the CM_FONTCHANGED and CM_TEXTCHANGED messages.

TComponent1 = class(TComponent)
…
private
…
procedure CMFontChanged(var Message: TMessage); message CM_FONTCHANGED;
procedure CMTextChanged(var Message: TMessage); message CM_TEXTCHANGED;
…
procedure TComponent1.CMTextChanged(var Message:TMessage);
begin
…
end;
procedure TComponent1.CMFontChanged(var Message:TMessage);
begin
…
end;

Delphi sends messages for notification of events that are only applicable to Delphi components. They are like Windows messages in use. If you have a component that publishes the Font property the component probably needs to be repainted if any subproperties in the Font are changed. Changing the Font property does not necessarily generate a [...]