[mythtv] Socket class?

David Engel dlengel at attbi.com
Mon Nov 24 01:26:06 EST 2003

On Mon, Nov 24, 2003 at 12:05:49AM -0500, Isaac Richards wrote:
> On Sunday 23 November 2003 09:39 pm, Matt Zimmerman wrote:
> > What's wrong with the one that myth is already using?
> It'd be really nice if it didn't require the Qt event loop to run to
> function.

I think that's what he's after.  It may be a moot point though.  I
suspect QSqlDatabase uses QSocket so any database queries will have
the same problem so we still have to solve it.

I wasn't intending to work on this problem, but it came up again while
doing some work on ViewScheduled(* see below).  What I came up with is
just some slight variations on what has already been done or
discussed.  The basic idea has two components.

First, block keyPressEvents or customEvents with a flag if either is
already active.  If a keyPressEvent gets blocked, just ignore it.  If
a customEvent gets blocked, set aother flag to handle it at then end
of the active keyPressEvent.

Second, block paintEventss with a flag when the internal data
structures are being refilled from the network or database.  If a
paintEvent gets blocked, set another flag to cause the next unblocked
paintEvent to always update everything.

I'm attaching a work-in-progress version of ViewScheduled for
comments.  It's not finished and not fully tested but works enough to
show the approach is sound.

(*)I was mainly doing two other changes.

First, I wanted to take a stab at simplifying the UIListType handling
which I always thought was confusing and over complicated.  I think
I've succeeded, but I'm biased.

Second, I wanted to add support for SCHEDULE_CHANGE customEvents.  We
now get the recording data from the scheduler in the master backend.
However, updaed data isn't available instantaneously after a change.
If we wait for the SCHEDULE_CHANGE customEvent, we get the latest data
and don't refill the internal data twice.

David Engel
dlengel at attbi.com
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