"Touchpad mode" is a mode where the mouse cursor is moved based on touch
movements rather on clicks. The problem was that when "touchpad mode"
was enabled it was very hard to click on items because the cursor moved
on every single click.
Make the action occur based on the current pointer position rather on
the touch location when in "touchpad mode".
Make the movement more intuitive when in "touchpad mode" by calculating
the delta of locations of touches and update the pointerPosition based
on that. That will give a feeling of using a real touchpad where the
location of where the touch occur doesn't matter for the cursor.
This will solve issue #13917
Move touch inputs to a TouchController class to move some logic from the
iPhoneView class. Only do this for touches on screen since connected
trackpads can generate touches as well. The latter ones are of type
UITouchTypeIndirectPointer while touches on screen are of type
UITouchTypeDirect. They are separated thanks to the preference key
UIApplicationSupportsIndirectInputEvents set to YES in Info.plist.
Without the preference above, there is no way to distinguish touches
from screen from a trackpad.
Lars Sundström