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Added "handleSize" option for fixed size handle #21

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Added "handleSize" option for fixed size handle #21

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20 changes: 17 additions & 3 deletions jquery.trackpad-scroll-emulator.js
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Original file line number Diff line number Diff line change
Expand Up @@ -95,11 +95,19 @@
if (scrollDirection === 'horiz') {
eventOffset = e.pageX;
}

var contentSize = sizeAttr === 'height' ? $contentEl.outerHeight() : $contentEl.outerWidth();
var scrollbarSize = $scrollbarEl[sizeAttr]();
var handleSize = $dragHandleEl[sizeAttr]();
var dragPos = eventOffset - $scrollbarEl.offset()[offsetAttr] - dragOffset;
dragPos += dragPos / (scrollbarSize - handleSize) * handleSize;

// Convert the mouse position into a percentage of the scrollbar height/width.
var dragPerc = dragPos / $scrollbarEl[sizeAttr]();
var dragPerc = dragPos / scrollbarSize;
dragPerc = (contentSize * dragPerc - (scrollbarSize * dragPerc)) / contentSize;

// Scroll the content by the same percentage.
var scrollPos = dragPerc * $contentEl[sizeAttr]();
var scrollPos = dragPerc * contentSize;

$scrollContentEl[scrollOffsetAttr](scrollPos);
}
Expand Down Expand Up @@ -157,6 +165,11 @@
var handleOffset = Math.round(scrollbarRatio * scrollOffset) + 2;
var handleSize = Math.floor(scrollbarRatio * (scrollbarSize - 2)) - 2;

if (options.handleSize) {
handleOffset += handleOffset / (scrollbarSize - handleSize) * (handleSize - options.handleSize);
handleSize = options.handleSize;
}

if (scrollbarSize < contentSize) {
if (scrollDirection === 'vert'){
$dragHandleEl.css({'top': handleOffset, 'height': handleSize});
Expand Down Expand Up @@ -323,7 +336,8 @@
onInit: function() {},
onDestroy: function() {},
wrapContent: true,
autoHide: true
autoHide: true,
handleSize: undefined
};

})(jQuery);