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Fancier scrolling logic with new API (hopefully fixes #972).

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This commit is contained in:
Kris Maglione
2013-04-21 20:32:02 -07:00
parent fe998eca06
commit 84dc52345c
1 changed files with 15 additions and 5 deletions
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20
common/modules/buffer.jsm
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@@ -1309,6 +1309,9 @@ var Buffer = Module("Buffer", {
get scrollWidth() this.win.scrollMaxX + this.win.innerWidth,
get scrollHeight() this.win.scrollMaxY + this.win.innerHeight,
get scrollLeftMax() this.win.scrollMaxX,
get scrollRightMax() this.win.scrollMaxY,
get scrollLeft() this.win.scrollX,
set scrollLeft(val) { this.win.scrollTo(val, this.win.scrollY) },
@@ -1406,23 +1409,30 @@ var Buffer = Module("Buffer", {
},
canScroll: function canScroll(elem, dir, horizontal) {
let pos = "scrollTop", size = "clientHeight", max = "scrollHeight", layoutSize = "offsetHeight",
let pos = "scrollTop", size = "clientHeight", end = "scrollHeight", layoutSize = "offsetHeight",
overflow = "overflowX", border1 = "borderTopWidth", border2 = "borderBottomWidth";
if (horizontal)
pos = "scrollLeft", size = "clientWidth", max = "scrollWidth", layoutSize = "offsetWidth",
pos = "scrollLeft", size = "clientWidth", end = "scrollWidth", layoutSize = "offsetWidth",
overflow = "overflowX", border1 = "borderLeftWidth", border2 = "borderRightWidth";
if (dir < 0)
return elem[pos] > 0;
let max = pos + "Max";
if (max in elem && pos > 0)
return elem[pos] < elem[max];
let style = DOM(elem).style;
let borderSize = Math.round(parseFloat(style[border1]) + parseFloat(style[border2]));
let realSize = elem[size];
// Stupid Gecko eccentricities. May fail for quirks mode documents.
if (elem[size] + borderSize == elem[max] || elem[size] == 0) // Stupid, fallible heuristic.
if (elem[size] + borderSize >= elem[end] || elem[size] == 0) // Stupid, fallible heuristic.
return false;
if (style[overflow] == "hidden")
realSize += borderSize;
return dir < 0 && elem[pos] > 0 || dir > 0 && elem[pos] + realSize < elem[max] || !dir && realSize < elem[max];
return dir > 0 && elem[pos] + realSize < elem[end] || !dir && realSize < elem[end];
},
/**
@@ -1529,7 +1539,7 @@ var Buffer = Module("Buffer", {
/**
* Scrolls the given element vertically.
*
* @param {Element} elem The element to scroll.
* @param {Node} node The node to scroll.
* @param {string} unit The increment by which to scroll.
* Possible values are: "lines", "pages"
* @param {number} number The possibly fractional number of