I have an 8 x 16 grid of buttons in a matrix to serve as an 8 track,16-step trigger sequencer. It's working fine, but as an extra convenience, I'd like if I could press down and drag over multiple buttons within that grid to toggle their states. For example, this would allow me to toggle on an entire row by pressing down on the first button in the row and swiping to the last button, then releasing.
Is there a way to achieve this? I haven't yet found an example of handling drag gestures that span multiple controls.