[haiku-development] BView with messages
- From: Caitlin Shaw <rogueeve@xxxxxxxxxxxxx>
- To: haiku-development@xxxxxxxxxxxxx
- Date: Sun, 27 Sep 2009 13:29:38 -0700
Yup, I have something to say about BViews again :). Anyway one of the
things I have found lacking in the Be API (although it makes sense) is
that BViews cannot receive messages. This is annoying when you have, for
example, a class derived from BView which is supposed to be a drop-in
component, and that class creates it's own controls etc within it's frame.
Be controls by default send their invocation messages to the owning
window, which means you have to either ping-pong the messages off the
window's MessageReceived (breaks encapsulation), or have the view spawn
it's own BLooper (a bit more extra clutter).
So I put together this little class, "MessageView". It works exactly
like BView, except that it provides a MessageReceived function which you
can override. It also provides two functions "Looper()" and
"Messenger()" which return a pointer to a looper and a messenger that
can be used to send messages which will show up in the view's
MessageReceived. All you do is tell your controls
"control->SetTarget(Looper())".
Is there something like this already? If not maybe someone will find it
useful. You can get it from
http://five75.sourceforge.net/files/MessageView.zip
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