Re: setMouseTracking DOESN'T WORK

[Raul C. <vid...@gm...>]

Hi Jason.
If I wrote the previous message is because I ALREADY set
setMouseTracking(true) and
simply it has NO EFFECT, so I think that I'm not stupid.
The documentation that I red say: pass true to setMouseTracking. I done it
and it doesn't work.
So is my mistake or a Qt/Qwt problem?
So there is a solution to this problem?
Regards
Raul


2007/9/27, Jason McInnis <jmc...@ak...>:
>
> First to answer your question:
>
> In Qt, by default mouseMoveEvent() is not generated unless the mouse
> button is
> pressed down.  To change this behaviour, you have to set the mouse
> tracking
> using.... you guessed it... setMouseTracking().
>
> Secondly:
>
> This is, to my knowledge, not a Qwt issue but a QT issue.  QT has one of
> the
> best documentation set of any tool available today. If you haven't
> already,
> you should install Qt's documentation tool "assistant" and use it first to
> answer many of your questions.
>
> Also, there is a good book for getting started with QT called "C++ GUI
> Programming with Qt 4" by Jasmin Blanchette and Mark Summerfield.
>
> I can appreciate the fact that it is very difficult to learn a new tool
> but in
> my experience Qt is the best toolkit I have ever used.  It has great
> documentation, works out-of-the-box, is very well designed and intuitive.
>
> This mailing-list is not for basic Qt or C++ questions. It is for Qwt
> related
> questions concerning software bugs, _undocumented_ features or the future
> of
> the Qwt library.  Although Qwt is not documented as well as Qt, Uwe has
> provide many examples of using Qwt which answer most of the basic uses of
> library.
>
> In other words... the mailing list is for anything not covered by
> documentation. We cannot teach you how to use these things over a mailing
> list. It is up to you to take the time to learn the basics. I suggest you
> take a couple of weeks to read and experiment with Qt before taking out
> your
> frustrations on this mailing list.
>
>
> On Thursday 27 September 2007 13:22:32 Raul Cortez wrote:
> > Hi Uwe thank for the reply.
> > Sorry but I don't understand. I WANT TO EXECUTE THE mouseMoveEvent(
> > QMouseEvent* e)
> > ALWAYS and not only when I press a mouse button.
> > HOW MUST I DO? IT DOESN'T WORK. IS A QT BUG OR WHAT??
> > I don't understand why is so difficult retrieve this informations from
> the
> > qt mailing list.
> > Please can you send to me a little code?
> > Regards
> > Raul
> >
> > 2007/9/27, Uwe Rathmann <Uwe...@ti...>:
> > > On Wednesday 26 September 2007 23:44, Raul Cortez wrote:
> > > > The problem is that I would like to execute the mouseMoveEvent
> routine
> > > > always and not only when I press a mouse button.
> > >
> > > You want to use a QwtPlotPicker with a display mode
> QwtPicker::AlwaysOn.
> > > Of
> > > course you can simply set this mode to your zoomer (also a picker) as
> > > well.
> > > If you want to change the displayed text ( or display text only on
> > > certain positions ) you have to overload QwtPlotPicker::trackerText.
> > >
> > > Detecting if the mouse position is above a curve is more difficult.
> One
> > > possible solution is to maintain a QBitmap for each curve in the size
> of
> > > the
> > > canvas. Whenever the curve is repainted to the canvas it has to be
> > > painted to
> > > its corresponding bitmap too. Then you have a very fast lookup.
> > >
> > > Uwe
> > >
> > >
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