If there are touch sequences being currently handled by this, this function returns
true and fills in
rect with the bounding box containing all active touches.
Otherwise, false will be returned.
Note: This function will yield unexpected results on touchpad gestures. Since there is no correlation between physical and pixel distances,
these will look as if constrained in an infinitely small area,
rect width and height will thus be 0 regardless of the number of
bounding box containing all active touches.
true if there are active touches, false otherwise