diff --git a/apps/kineticscroll/ChangeLog b/apps/kineticscroll/ChangeLog new file mode 100644 index 000000000..5560f00bc --- /dev/null +++ b/apps/kineticscroll/ChangeLog @@ -0,0 +1 @@ +0.01: New App! diff --git a/apps/kineticscroll/README.md b/apps/kineticscroll/README.md new file mode 100644 index 000000000..be451a7f4 --- /dev/null +++ b/apps/kineticscroll/README.md @@ -0,0 +1,7 @@ +# Kinetic scrolling + +This patches the default scroller implementation to use kinetic scrolling. It is based on the original implementation. + +## Creator + +[halemmerich](https://github.com/halemmerich) diff --git a/apps/kineticscroll/app.png b/apps/kineticscroll/app.png new file mode 100644 index 000000000..f3184b5c0 Binary files /dev/null and b/apps/kineticscroll/app.png differ diff --git a/apps/kineticscroll/boot.js b/apps/kineticscroll/boot.js new file mode 100644 index 000000000..f0bd0af74 --- /dev/null +++ b/apps/kineticscroll/boot.js @@ -0,0 +1,175 @@ +(function() { + E.showScroller = function(options) { + /* options = { + h = height + c = # of items + scroll = initial scroll position + scrollMin = minimum scroll amount (can be negative) + draw = function(idx, rect) + remove = function() + select = function(idx, touch) + } + + returns { + scroll: int // current scroll amount + draw: function() // draw all + drawItem : function(idx) // draw specific item + isActive : function() // is this scroller still active? + } + + */ + if (!options) return Bangle.setUI(); // remove existing handlers + + const MAX_VELOCITY=100; + let scheduledDraw; + let velocity = 0; + let accDy = 0; + let scheduledBrake = setInterval(()=>{velocity*=0.9;}, 50); + let lastDragStart = 0; + let R = Bangle.appRect; + let menuScrollMin = 0|options.scrollMin; + let menuScrollMax = options.h*options.c - R.h; + if (menuScrollMax{ + if (e.y=0) && i { + let dy = velocity; + if (s.scroll - dy > menuScrollMax){ + dy = s.scroll - menuScrollMax; + velocity = 0; + } + if (s.scroll - dy < menuScrollMin){ + dy = s.scroll - menuScrollMin; + velocity = 0; + } + + s.scroll -= dy; + + let oldScroll = rScroll; + rScroll = s.scroll &~1; + let d = oldScroll-rScroll; + + if (Math.abs(velocity) > 0.01) + scheduledDraw = setTimeout(draw,0); + else + scheduledDraw = undefined; + + if (!d) { + return; + } + g.reset().setClipRect(R.x,R.y,R.x2,R.y2).scroll(0,d); + if (d < 0) { + let y = Math.max(R.y2-(1-d), R.y); + g.setClipRect(R.x,y,R.x2,R.y2); + let i = YtoIdx(y); + + for (y = idxToY(i);y < R.y2;y+=options.h) { + options.draw(i, {x:R.x,y:y,w:R.w,h:options.h}); + i++; + } + } else { // d>0 + let y = Math.min(R.y+d, R.y2); + g.setClipRect(R.x,R.y,R.x2,y); + let i = YtoIdx(y); + y = idxToY(i); + + for (y = idxToY(i);y > R.y-options.h;y-=options.h) { + options.draw(i, {x:R.x,y:y,w:R.w,h:options.h}); + i--; + } + } + g.setClipRect(0,0,g.getWidth()-1,g.getHeight()-1); + }; + + const dragHandler = e=>{ + if ((velocity <0 && e.dy>0) || (velocity > 0 && e.dy<0)){ + velocity *= -1; + accDy = 5 * velocity; + } + //velocity += e.dy * (Date.now() - lastDrag); + if (e.b > 0){ + if (!lastDragStart){ + lastDragStart = Date.now(); + velocity = 0; + accDy = 0; + } + accDy += e.dy; + } + velocity = accDy / (Date.now() - lastDragStart) * MAX_VELOCITY; + + if (lastDragStart && e.b == 0){ + accDy = 0; + lastDragStart = 0; + } + + velocity = E.clip(velocity,-MAX_VELOCITY,MAX_VELOCITY); + lastDrag=Date.now(); + if (!scheduledDraw){ + scheduledDraw = setTimeout(draw,0); + } + }; + + let uiOpts = { + mode : "custom", + back : options.back, + remove : ()=>{ + if (scheduledDraw) + clearTimeout(scheduledDraw); + clearInterval(scheduledBrake); + if (options.remove) options.remove(); + }, + drag : dragHandler, + touch : touchHandler + } + + if (options.remove) uiOpts.remove = () => { + if (scheduledDraw) + clearTimeout(scheduledDraw); + clearInterval(scheduledBrake); + if (options.remove) options.remove(); + } + + Bangle.setUI(uiOpts); + + + function idxToY(i) { + return i*options.h + R.y - rScroll; + } + function YtoIdx(y) { + return Math.floor((y + rScroll - R.y)/options.h); + } + + let s = { + scroll : E.clip(0|options.scroll,menuScrollMin,menuScrollMax), + draw : () => { + g.reset().clearRect(R).setClipRect(R.x,R.y,R.x2,R.y2); + let a = YtoIdx(R.y); + let b = Math.min(YtoIdx(R.y2),options.c-1); + for (let i=a;i<=b;i++) + options.draw(i, {x:R.x,y:idxToY(i),w:R.w,h:options.h}); + g.setClipRect(0,0,g.getWidth()-1,g.getHeight()-1); + }, drawItem : i => { + let y = idxToY(i); + g.reset().setClipRect(R.x,Math.max(y,R.y),R.x2,Math.min(y+options.h,R.y2)); + options.draw(i, {x:R.x,y:y,w:R.w,h:options.h}); + g.setClipRect(0,0,g.getWidth()-1,g.getHeight()-1); + }, isActive : () => Bangle.touchHandler == touchHandler + }; + + let rScroll = s.scroll&~1; // rendered menu scroll (we only shift by 2 because of dither) + s.draw(); // draw the full scroller + g.flip(); // force an update now to make this snappier + return s; + }; +})(); diff --git a/apps/kineticscroll/metadata.json b/apps/kineticscroll/metadata.json new file mode 100644 index 000000000..9311ea8d3 --- /dev/null +++ b/apps/kineticscroll/metadata.json @@ -0,0 +1,14 @@ +{ "id": "kineticscroll", + "name": "Kinetic Scroll", + "shortName":"Kinetic Scroll", + "version":"0.01", + "description": "Replacement for the system scroller with kinetic scrolling.", + "icon": "app.png", + "type": "bootloader", + "tags": "system", + "supports" : ["BANGLEJS2"], + "readme": "README.md", + "storage": [ + {"name":"kineticscroll.boot.js","url":"boot.js"} + ] +}