[Lazarus] Detect that component selected in OI.

[Ondrej Pokorny]

On 22.05.2016 11:02, Ondrej Pokorny wrote:
> On 22.05.2016 8:50, Ondrej Pokorny wrote:
>> IMO you can suggest a custom designing message that will handle it 
>> without hard-coding it into the IDE. Because e.g. the TNotebook page 
>> change doesn't work.
>
> No need. I added CM_OBJECTINSPECTORSELECT in r52338.

No, I reverted it. I though a little bit more about it and we shouldn't 
pollute the LCL with designer code if not necessary.

Instead, do what Howard suggested (although not directly): In your 
component's design-time package, register a SetSelection hook 
("GlobalDesignHook.AddHandlerSetSelection(@OnComponentSelection);"). 
Then in OnComponentSelection you check if your own component is in the 
new selection and do whatever you want.

Ondrej