I need to have a double headed slider
i've searched all over for ideas on how to make this by reimplementing qslider, but there just seems to be a bunch of people who have needed this and all have given up and i don't understand the majority of the proposed solutions
my idea tho, was to build my own very simple one from scratch....I would have basically 2 drag'n'drop widgets on top of a background (i don't think the background would be very hard to draw at all)....but the problem is, even if i set the background widget to only accept drops on a narrow, vertical axis....it would still be possible to
1)move the slider very slightly left to right and
2) drag the head left and right even though the drop would not be accepted there - the forbidden cursor would just appear

is there any way to limit the drag and drop functions to only look at the change in y location of the mouse and completely ignore the x movement? so if i drag the slider head to the upper left corner of the screen, it will only move directly upwards....