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Allow for smooth arrows and custom height function #5

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Allow for smooth arrows and custom height function #5

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47 changes: 35 additions & 12 deletions src/jquery.smoothwheel.js
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Original file line number Diff line number Diff line change
Expand Up @@ -18,7 +18,7 @@
var updateScrollTarget = function (amt) {
targetY += amt;
vy += (targetY - oldY) * stepAmt;

oldY = targetY;


Expand All @@ -33,11 +33,11 @@
vy = 0;
currentY = minScrollTop;
}

container.scrollTop(-currentY);

vy *= fricton;

// vy += ts * (currentY-targetY);
// scrollTopTweened += settings.tweenSpeed * (scrollTop - scrollTopTweened);
// currentY += ts * (targetY - currentY);
Expand All @@ -56,7 +56,7 @@
var onWheel = function (e) {
e.preventDefault();
var evt = e.originalEvent;

var delta = evt.detail ? evt.detail * -1 : evt.wheelDelta / 40;
var dir = delta < 0 ? -1 : 1;
if (dir != direction) {
Expand All @@ -66,10 +66,27 @@

//reset currentY in case non-wheel scroll has occurred (scrollbar drag, etc.)
currentY = -container.scrollTop();

updateScrollTarget(delta);
}

var arrowKeyScroll = function (event) {
var ArrowKeys = {
'up': '38',
'down': '40'
}

if (event.keyCode == ArrowKeys.up || event.keyCode == ArrowKeys.down ) {
event.preventDefault();
if (event.keyCode == ArrowKeys.up) {
event.originalEvent.wheelDelta = 120
} else {
event.originalEvent.wheelDelta = -120
}
onWheel(event);
}
}

/*
* http://paulirish.com/2011/requestanimationframe-for-smart-animating/
*/
Expand All @@ -81,9 +98,9 @@
window.msRequestAnimationFrame ||
function (callback) {
window.setTimeout(callback, 1000 / 60);
};
};


})();

/*
Expand Down Expand Up @@ -126,17 +143,23 @@
container = $(this);
container.bind("mousewheel", onWheel);
container.bind("DOMMouseScroll", onWheel);
container.bind("keydown", arrowKeyScroll);

//set target/old/current Y to match current scroll position to prevent jump to top of container
targetY = oldY = container.get(0).scrollTop;
currentY = -targetY;

minScrollTop = container.get(0).clientHeight - container.get(0).scrollHeight;

if(!options.minScrollTopFn) {
minScrollTop = container.get(0).clientHeight - container.get(0).scrollHeight;
}
else {
minScrollTop = options.minScrollTopFn(container, options)
}

if(options.onRender){
onRenderCallback = options.onRender;
}
if(options.remove){
log("122","smoothWheel","remove", "");
running=false;
container.unbind("mousewheel", onWheel);
container.unbind("DOMMouseScroll", onWheel);
Expand All @@ -150,4 +173,4 @@
};


})(jQuery);
})(jQuery);