[haiku-3rdparty-dev] Re: Finding property changes in a widget or BControl
- From: Stephan Assmus <superstippi@xxxxxx>
- To: haiku-3rdparty-dev@xxxxxxxxxxxxx
- Date: Fri, 13 Nov 2009 10:18:22 +0100
Hi,
On 2009-11-13 at 08:51:38 [+0100], Yashasvi A.C. <yashasviac@xxxxxxxxx>
wrote:
> I have been trying to capture messages to find out when the property of a
> specific widget has changed. Thus, when a "button goes disabled" or a
> "checkbox is checked" or something similar, I attached a filter to these
> widgets to catch messages like _DIS (for disabled) or _CHE(for checked).
> Those message names are just examples to explain what I am trying to
> catch. :)
>
> I have put in a filter for each widget in the parent window using:
> *fWidgetFilter = new BMessageFilter(B_ANY_DELIVERY, B_ANY_SOURCE,
> (filter_hook) &BALM::widget_message_hook);
>
> for (int32 i = 0; i < parent->CountChildren(); i++)
> fParent->ChildAt(i)->AddFilter(fWidgetFilter);
>
> *So, inside the widget_message_hook() function, I pretty much display the
> message->what as 4 characters. Whenever I hover, the mouse over the
> button or checkbox, I get the _MMV message. A click gives me _MDN and
> _MUP messages. That is perfect. But, I cant get the property state
> changes to pop up as a message. Am I doing something wrong? Or does Haiku
> work differently for property changes and not create a message? If so,
> how can I capture it? I am trying to get a generic function going so that
> I can just put in an event handler for all the widgets (like the for loop
> above) and just print out the messages.
IIRC, I already replied to your problem with one specific solution. But I
just now have Internet access again, so I have a lot of catching up to do.
I don't know if you already replied to my message. In any case, it sounds
like you still have the exact same problem as before, and my original reply
would still be a good solution. If you have not already responded, please
try to ask specific questions you have with regards to the solution I
already provided.
> Also, the BTextControl works strangely different. The moment the focus
> goes inside the text box, the _MMV, _MDN, _MUP messages stop displaying.
> Also, I cant seem to capture the key change events which I could catch
> before. Does BTextControl have some sort "absorbing" functionality for
> the messages and not let them get displayed? I am quite baffled. :( I
> would like to get messages related to the text box as well.
The BTextControl is a compound widget (same as BMenuField/BOptionControl).
It embeds another view, so the mouse events go to that one.
Best regards,
-Stephan
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