[Lazarus] Maybe a bug: click on TImage behind another control with SetShape

[Fabio Luis Girardi]

Here is it: http://bugs.freepascal.org/view.php?id=20381

2014-11-21 22:24 GMT-02:00 Fabio Luis Girardi <fluisgirardi at gmail.com>:

> I found this bug on bug tracker. I followed your idea and send a patch
> that solves this. I'll try another approach tomorrow.
>
> Thank you very much!
> Em 21/11/2014 20:48, "Frederic Da Vitoria" <davitofrg at gmail.com> escreveu:
>
> 2014-11-21 16:01 GMT+01:00 Frederic Da Vitoria <davitofrg at gmail.com>:
>>
>>>
>>> 2014-11-20 19:21 GMT+01:00 Fabio Luis Girardi <fluisgirardi at gmail.com>:
>>>
>>>> I don't know if this is a bug or not. I created a control from a
>>>> TCustomControl that draws a polyline with a transparent background. The
>>>> transparent effect has been using SetShape procedure using a bitmap of 1
>>>> bit color depth.
>>>>
>>>> The "bug" (I don't know if this is a bug) is that a TImage behind of a
>>>> instance of my polyline control don't receive the click messages, but a
>>>> TButton instance receives.
>>>>
>>>> So, I don't know if this is a bug or I have to do something in my
>>>> control to send these messages to TImage behind.
>>>>
>>>
>>> I had once a similar issue with a tPanel behind another control, in
>>> Delphi. IIRC, I indeed had to forward the messages in some way to the
>>> tPanel. I can check in my archives, if you want, but I won't be able to do
>>> it before tomorrow.
>>>
>>
>> I just checked. Sorry, my memory was wrong, I did use TButtons. But it
>> makes sense that the uppermost control would prevent any deeper control
>> from receiving clicks, even if the uppermost control is visually
>> transparent.
>>
>> --
>> Frederic Da Vitoria
>> (davitof)
>>
>> Membre de l'April - « promouvoir et défendre le logiciel libre » -
>> http://www.april.org
>>
>


-- 
The best regards,

Fabio Luis Girardi
PascalSCADA Project
http://sourceforge.net/projects/pascalscada
http://www.pascalscada.com
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