Angus Leeming wrote:
> On Thursday 30 October 2003 2:00 pm, Ronald Florence wrote:
>> Angus Leeming <[EMAIL PROTECTED]> writes:
>> > The fix is trivial (for Qt too) and requires that
>> > LyX responds only to a subset of mouse events from the underlying
>> > X11, MacOS or Win32 graphics libraries. In the xforms frontend we
>> > use a timer, so:
>> > // The timer runs for 200ms
>> > static Timer timer(200);
>> > if (timer.running())
>> > return;
>> > timer.start();
>> > dispatch(mouse_event_to_the_lyx_core);
>> >
>> > This could go in, almost as is, to the mouseEventHandler in
>> > QContentPane.C. Feel free to try ;-)
>>
>> Is this fix going into LyX-1.3.4?
>
> In order for any fix to go in, I'd need to know the Qt equivalent of
> XEvent::xmotion.[x,y].
Well, I had a go. See below. Unfortunately, it doesn't work as I'd
like. Qt emits a mouseMoveEvent signal only when --- you've guessed
it --- the mouse is moved. No signal is emitted when the mouse is
just pressed but otherwise doing nothing. This differs from xforms
that emits event calls when this happens (using a timer to
artificially generate events).
So, shold we do what xforms does and start a timer on a mouse press
event so that we can generate 'pseudo' mouse events every 'interval'
msecs?
Angus
void QContentPane::mouseMoveEvent(QMouseEvent * e)
{
// Check if the mouse is above or below the workarea
if (e->y() <= y() || e->y() >= y() + height()) {
// The mouse button is depressed and we are outside the
// workarea. That means we are simultaneously selecting
// text and scrolling the view.
// Use a Timeout to react to a drag events only every
// 200ms. All intervening events are discarded,
// allowing the user to control position easily.
static int const discard_interval = 200;
static Timeout timeout(discard_interval);
if (timeout.running())
return;
// The timeout is not running, so process the
// event, first starting the timeout to discard future
// events.
timeout.start();
}
FuncRequest cmd(LFUN_MOUSE_MOTION, e->x(), e->y(),
q_motion_state(e->state()));
wa_->dispatch(cmd);
}
