Handling multitouch in flutter

Question

In flutter, there is a standard GestureDetector that allows to interprets the commands "touch down", "touch move" and "touch up" by means of the corresponding handlers:

• onPanStart: _handlePanStart,
• onPanUpdate: _handlePanUpdate,
• onPanEnd: _handlePanEnd,

However, we are talking about processing a single touch, but what if I want to handle several parallel touches and movements? I.e. really use multitouch? Is there any kind of built-in control in flutter (maybe multitouch gesture detector, I don't known) that allows to get a vector or a list of events of clicks, movements, ups with ids of touches and their current coordinates?

Solution

Looks like you are looking for MultiDragGestureRecognizer. Look into this thread to know more.

Edit : There is no direct widget that you can use. You'll need to create a StatefulWidget that instantiates the MultiDragGestureRecognizer, then have your build function have a Listener that routes the onPointerDown event to the recognizer.

Comments

[pskink]

see Listener class (and its onPointer* properties) or you simply need GestureDetector#onScale* properties?