PR submitted to clarify the touchMove dictionary entry: https://github.com/livecode/livecode/pull/6413
On Mon, Mar 12, 2018 at 5:24 PM, Brian Milby <br...@milby7.com> wrote: > Short answer, you need to track the location of each touch yourself and do > the math. > > Check out this piece of code: > https://raw.githubusercontent.com/bwmilby/lc-misc/master/ > PinchZoom/pinchzoom.livecodescript > > That is a piece of code that I translated into LCS that deals with > tracking two touch points to zoom an object. Depending on what you want to > accomplish, you won't need anything that complicated. > > Looking at the Netflix app, you can either go vertical or horizontal. > First movement direction locks it until all touches are released. So you > would need to capture the touchStart to get the ID and then 2 touchMove > messages to establish direction (I didn't try using mouseloc to get the > touchStart location). You may want to pair the direction detection with a > minimum to ensure you capture the correct direction. > > Hope this helps, > Brian > > On Mon, Mar 12, 2018 at 4:39 PM, Sannyasin Brahmanathaswami via > use-livecode <use-livecode@lists.runrev.com> wrote: > >> I have a group control (made up smaller groups) they I want users to >> scroll vertically. And the sub-groups, which want the user to scroller >> horizontally. My current thinking is to turn off scrollers until we get >> swipe direction, and turn them on, "mid-swipe" >> >> simply: how do you know if touchMove is a horizontal or vertical swipe? >> >> in the dictionary, it says (another cryptic entry!) >> >> touchMove pTouchID, pTouchX, pTouchY >> >> Summary >> >> Sent when the point at which the user is touching the screen changes. >> Example >> >> on touchMove pTouchID, pX, pY >> if pX > lastX then >> -- user has moved to the right >> end if >> end touchMove >> >> where does "lastX" come from? It is not localized as a variable. >> >> Other touch handlers do not record the X,Y coords of touchRelease. >> >> should we >> >> local sLastMouseUp >> >> end touchRelease >> put the mouseloc to sLastMouseUp >> end touchRelease >> >> on touchMove pTouchID, pX, pY >> if pX > (item 1 of sLastMouseUp) then >> -- user has moved to the right >> end if >> end touchMove >> >> But this relative to the last swipe - this is not "runtime" as the >> dictionary says: >> >> "Handle the touchMove message if you want to perform some action when >> the user changes the touch position without ending the touch or if you >> want to keep continuous track of the touch position." >> >> BR >> >> >> >> >> >> >> >> >> _______________________________________________ >> use-livecode mailing list >> use-livecode@lists.runrev.com >> Please visit this url to subscribe, unsubscribe and manage your >> subscription preferences: >> http://lists.runrev.com/mailman/listinfo/use-livecode >> > > _______________________________________________ use-livecode mailing list use-livecode@lists.runrev.com Please visit this url to subscribe, unsubscribe and manage your subscription preferences: http://lists.runrev.com/mailman/listinfo/use-livecode
