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Bug 398965 - "tab bar smooth-scrolling performance problems" (binary search) [p=dao r=gavin a1.9=sayrer]

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This commit is contained in:
reed@reedloden.com 2007-10-13 18:57:47 -07:00
parent b8c5000c4f
commit aa5d454135
1 changed files with 46 additions and 58 deletions
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104
toolkit/content/widgets/scrollbox.xml
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@ -197,28 +197,14 @@
}
if (!this._isLTRScrollbox)
index *= -1;
var nextElement;
var elements = this.hasChildNodes() ?
this.childNodes :
document.getBindingParent(this).childNodes;
var scrollBox = this.scrollBoxObject;
var edge = scrollBox.screenX;
if (index < 0) {
for (var i = 0; nextElement = elements[i]; i++) {
var x = nextElement.boxObject.screenX;
if (x < edge &&
x + nextElement.boxObject.width + 1 >= edge)
break;
}
} else {
if (index > 0)
edge += scrollBox.width;
for (var i = 0; nextElement = elements[i]; i++) {
var x = nextElement.boxObject.screenX;
if (x <= edge &&
x + nextElement.boxObject.width > edge)
break;
}
}
else
edge--;
var nextElement = this._elementFromPoint(edge);
if (!nextElement)
return;
@ -239,6 +225,32 @@
]]></body>
</method>
<method name="_elementFromPoint">
<parameter name="aX"/>
<body><![CDATA[
var elements = this.hasChildNodes() ?
this.childNodes :
document.getBindingParent(this).childNodes;
var low = 0;
var high = elements.length - 1;
while (low <= high) {
var mid = Math.floor((low + high) / 2);
var element = elements[mid];
var bO = element.boxObject;
var x = bO.screenX;
if (x > aX)
high = mid - 1;
else if (x + bO.width < aX)
low = mid + 1;
else
return element;
}
return null;
]]></body>
</method>
<method name="scrollByPixels">
<parameter name="px"/>
<body><![CDATA[
@ -539,53 +551,29 @@
if (!this._isLTRScrollbox)
scrollLeft = !scrollLeft;
var targetElement;
var elements = this.hasChildNodes() ?
this.childNodes :
document.getBindingParent(this).childNodes;
if (aEvent.detail == 2) {
// scroll by the width of the scrollbox; make sure that the next
// partly-offscreen element will become fully visible.
// partly-hidden element will become fully visible.
var scrollBox = this.scrollBoxObject;
var edge = scrollBox.screenX;
if (scrollLeft) {
for (var i = 0; targetElement = elements[i]; i++) {
var x = targetElement.boxObject.screenX;
if (x < edge &&
x + targetElement.boxObject.width + 1 >= edge)
break;
}
if (!targetElement)
return;
edge = targetElement.boxObject.screenX +
targetElement.boxObject.width - scrollBox.width;
while ((targetElement = targetElement.previousSibling))
if (targetElement.boxObject.screenX < edge)
break;
if (targetElement)
targetElement = targetElement.nextSibling;
} else {
edge += scrollBox.width;
for (var i = 0; targetElement = elements[i]; i++) {
var x = targetElement.boxObject.screenX;
if (x <= edge &&
x + targetElement.boxObject.width > edge)
break;
}
if (!targetElement)
return;
edge = targetElement.boxObject.screenX + scrollBox.width;
while ((targetElement = targetElement.nextSibling))
if (targetElement.boxObject.screenX + targetElement.boxObject.width > edge)
break;
if (targetElement)
targetElement = targetElement.previousSibling;
}
if (scrollLeft)
edge -= scrollBox.width;
else
edge += scrollBox.width * 2;
targetElement = this._elementFromPoint(edge);
if (targetElement)
targetElement = scrollLeft ?
targetElement.nextSibling :
targetElement.previousSibling;
}
if (!targetElement)
if (!targetElement) {
// scroll to the first resp. last element
targetElement = scrollLeft ? elements[0] : elements[elements.length - 1];
var container = this.hasChildNodes() ? this : document.getBindingParent(this);
targetElement = scrollLeft ? container.firstChild : container.lastChild;
}
this.ensureElementIsVisible(targetElement);
]]></body>