[Qt-interest] Multi Gesture

[Wathek LOUED]

Sean,

Thank you for your reponse, since I use QGraphicsView, QGraphicsScene and
QGraphicsItem/QGraphicsObject I thought of scanning/filtering all the
TouchPoints and passsing the touch points contained in the QGraphicsObject
to the QGesture and then use that list instead.

W.L

On Mon, Mar 21, 2011 at 5:33 PM, Sean Hayes <sean.t.hayes at vanderbilt.edu>wrote:

> Wathek,
>
> All the touch points will go to all the gesture recognizers. As a result,
> each gesture recognizer will have to determine which touch points that are
> pertinent for triggering its gesture. I am not sure of the best method, but
> here is one idea. Every touch point has a unique id (see
> http://doc.qt.nokia.com/latest/qtouchevent-touchpoint.html#id). You can
> have a data structure that associates a touch point with the gesture
> recognizers (maybe a QHash<id, QGestureRecognizer*>). You could create an
> abstract class that inherits QGestureRecognizer and that is itself inherited
> by all your custom gesture recognizers. This class would contain a static
> instance of you qtouchpoint data structure. That way all your gesture
> recognizer could check the "ownership" of any touch points.
>
> Sean
>
>
> On Mon, Mar 21, 2011 at 10:00 AM, Wathek LOUED <wathek at gmail.com> wrote:
>
>> Sean,
>>
>> Thank you for your response, I'd like to ask you if you got an idea how
>> can I do to know to know which touch points are handled by which gesture
>> recognizer because you know let's say I got two objects so two different
>> instance of my gesture recognizer but the problem is that I don't think that
>> I need to send all the time all the touched points to the gesture recognizer
>> I need just to send the touched point that are contained into the object.
>> You see what I mean ?
>>
>> Sincerely
>> W.L
>>
>> On Sun, Mar 20, 2011 at 7:59 PM, Sean Hayes <sean.t.hayes at vanderbilt.edu>wrote:
>>
>>> Wathek,
>>>
>>> You are right, you only get the QGesture that is given to
>>> the QGestureRecognizer and you cannot create two separate gestures of the
>>> same type (as far as I know). I did not think about that before. However, a
>>> unique QGesture is given to each QGestureRecognizer. Also,
>>> each QGestureRecognizer receives all the events that all the
>>> other QGestureRecognizers receive. Therefore, you should be able to have
>>> simultanious gestures limited only by the number of
>>> registered QGestureRecognizers.
>>>
>>> I have never tried this with the same gesture type, but you should be
>>> able to get two gestures of the same type by registering two instances of
>>> that gesture recognizer. This may only work for custom gestures (not the
>>> Qt's built in ones) because each regestered QGestureRecognizer may need a
>>> unique Qt::GestureType. That is just speculation. I am not sure how
>>> practical this idea is, but I suspect it would work.
>>>
>>> Let me know what you think.
>>>
>>> Sean
>>>
>>>
>>> On Sun, Mar 20, 2011 at 12:36 PM, Wathek LOUED <wathek at gmail.com> wrote:
>>>
>>>> Sean,
>>>>
>>>> Yes but the problem is that since that QGestureRecognizer doesn't free
>>>> the QGesture and it uses always the same QGesture it only resets it I cannot
>>>> have two (or more) same gestures at the same time.
>>>>
>>>> Let's say that the gesture is a Tap and Hold so it needs about 700ms
>>>> without moving to recognize the gesture. So first touched Point the
>>>> GestureRecognizer setted the QGesture parameters (Position, Timer, etc). At
>>>> 400ms a second Touched Point arrived, the GestureRecognizer cannot do
>>>> anything since it's busy with the first one. You see ?
>>>>
>>>>
>>>> On Sun, Mar 20, 2011 at 5:44 PM, Wathek LOUED <wathek at gmail.com> wrote:
>>>>
>>>>> I see I got an other question. I'd like to know when the
>>>>> QGestureRecognizer changes the QGesture::state to
>>>>> QGestureRecognizer::CancelGesture or QGestureRecognizer::FinishGesture is
>>>>> the QGesture killed ?
>>>>>
>>>>>  On Sun, Mar 20, 2011 at 3:53 PM, Sean Hayes <
>>>>> sean.t.hayes at vanderbilt.edu> wrote:
>>>>>
>>>>>> Wathek,
>>>>>>
>>>>>> You could probably do  this by created you own gesture classes that
>>>>>> subclass QGesture. The key would be how you recognize the gestures in your
>>>>>> gesture recognizer. For example, you could monitor all the touch points
>>>>>> received and see any one of them match your gestures (as opposed to only
>>>>>> checking the first point or two). If you are use some gestures that utilize
>>>>>> more than one touch point, you could test if any combinational of two points
>>>>>> matches your gesture.
>>>>>>
>>>>>> Sean
>>>>>>
>>>>>> On Sun, Mar 20, 2011 at 7:38 AM, Wathek LOUED <wathek at gmail.com>wrote:
>>>>>>
>>>>>>> Hi all,
>>>>>>>
>>>>>>> I was thinking how can I do to get a multi gesture ? let's say a
>>>>>>> finger to do a Tap And Hold Gesture and another finger where the user does a
>>>>>>> Pan Gesture. Using the QGesture of Qt it won't work. Any idea how can I do
>>>>>>> so that it'll be possible ?
>>>>>>>
>>>>>>> Thank you
>>>>>>>
>>>>>>> Sincerely
>>>>>>> Wathek
>>>>>>>
>>>>>>> _______________________________________________
>>>>>>> Qt-interest mailing list
>>>>>>> Qt-interest at qt.nokia.com
>>>>>>> http://lists.qt.nokia.com/mailman/listinfo/qt-interest
>>>>>>>
>>>>>>>
>>>>>>
>>>>>
>>>>
>>>
>>
>
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