[Qt] Request to add clipboard operation messages

[Luiz Americo Pereira Camara]

On 13/10/2011 07:47, zeljko wrote:
>
> On Thursday 13 of October 2011 08:17:27 Luiz Americo Pereira Camara wrote:
>
> > Hi,
>
> >
>
> > In order to implement LM_CLEAR, LM_CUT, LM_PASTE and LM_COPY under
>
> > LCL/Qt is necessary to notify the widgetset when those actions occurs.
>
>
> Why ?
>

To fix the following bugs:

http://bugs.freepascal.org/view.php?id=20475
http://bugs.freepascal.org/view.php?id=20394
http://bugs.freepascal.org/view.php?id=20330

> or better eg: if LCL sent LM_COPY to Qt ws, what happened before
>
> a) LCL already maded copy ?
>

No

> b) LCL wants to copy something ?
>

Yes. Under Delphi you can even abort the copy


Under Qt those messages are not handled at all.
They're used to notify controls that a paste, copy, cut is about to 
occur. Delphi also allows to abort them. Lazarus currently does not 
allow that, but in win32 and gtk2 i can make also make abort. With the 
proposed i can make it work also on Qt

I attached a Delphi test program (switch CallInherited). You can also 
take a look at example in http://bugs.freepascal.org/view.php?id=20330

Under Lazarus it will not be possible to abort not calling inherited in 
all widgetsets but can be done using Message.Result at least in Qt, Gtk2 
and Win32 like other events. Carbon does not work at all. Felipe was 
looking at it.

Luiz

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