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add support for "pixel-perfect" scrolling

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This commit is contained in:
Unrud 2018-07-31 20:19:10 +02:00
parent 209eaf960d
commit c1509ac8fa
6 changed files with 57 additions and 19 deletions
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24
webdata/fn.js
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@ -20,8 +20,6 @@
// [1 Touch, 2 Touches, 3 Touches]
const TOUCH_MOVE_THRESHOLD = [10, 15, 15];
const TOUCH_TIMEOUT = 250;
const MOVE_MULT = 1;
const SCROLL_MULT = 0.05;
// [[px/s, mult], ...]
const POINTER_ACCELERATION = [[0, 0], [87, 1], [173, 1], [553, 2]];
@ -40,6 +38,7 @@ var scrollXSum = 0;
var scrollYSum = 0;
var dragging = false;
var draggingTimeout = null;
var scrolling = false;
function fullscreenEnabled() {
return (document.fullscreenEnabled ||
@ -153,6 +152,7 @@ function updateMoveAndScroll() {
if (Math.abs(scrollX) >= 1 || Math.abs(scrollY) >= 1) {
scrollXSum -= scrollX;
scrollYSum -= scrollY;
scrolling = true;
ws.send("s" + scrollX + ";" + scrollY);
}
}
@ -183,6 +183,10 @@ function handleStart(evt) {
draggingTimeout = null;
dragging = true;
}
if (scrolling) {
ws.send("sf");
scrolling = false;
}
}
}
@ -196,6 +200,10 @@ function handleEnd(evt) {
ongoingTouches.splice(idx, 1);
touchReleasedCount++;
touchLastEnd = evt.timeStamp;
if (scrolling) {
ws.send("sf");
scrolling = false;
}
}
if (touchReleasedCount > TOUCH_MOVE_THRESHOLD.length) {
touchMoved = true;
@ -234,6 +242,10 @@ function handleCancel(evt) {
touchReleasedCount++;
touchLastEnd = evt.timeStamp;
touchMoved = true;
if (scrolling) {
ws.send("sf");
scrolling = false;
}
}
}
@ -261,11 +273,11 @@ function handleMove(evt) {
}
if (touchMoved && evt.timeStamp - touchLastEnd >= TOUCH_TIMEOUT) {
if (ongoingTouches.length == 1 || dragging) {
moveXSum += sumX * MOVE_MULT;
moveYSum += sumY * MOVE_MULT;
moveXSum += sumX;
moveYSum += sumY;
} else if (ongoingTouches.length == 2) {
scrollXSum -= sumX * SCROLL_MULT;
scrollYSum -= sumY * SCROLL_MULT;
scrollXSum -= sumX;
scrollYSum -= sumY;
}
updateMoveAndScroll();
}