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Bug 1403563 - Allow multiple wheel events to accelerate scrollbox scrolling. r=dao

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MozReview-Commit-ID: Lo7HxK6TGwd

--HG--
extra : rebase_source : 342735b8c6d8fcd9de49ce2a713972082cab68e7
This commit is contained in:
Mike Conley 2017-11-08 17:05:06 -05:00
parent 0648f86b7f
commit 265d540422
1 changed files with 30 additions and 0 deletions
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30
toolkit/content/widgets/scrollbox.xml
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@ -150,6 +150,14 @@
]]></getter>
</property>
<property name="scrollPosition" readonly="true">
<getter><![CDATA[
return this.orient == "vertical" ?
this._scrollbox.scrollTop :
this._scrollbox.scrollLeft;
]]></getter>
</property>
<field name="_startEndProps"><![CDATA[
this.orient == "vertical" ? ["top", "bottom"] : ["left", "right"];
]]></field>
@ -404,6 +412,10 @@
});
]]></body>
</method>
<field name="_isScrolling">false</field>
<field name="_destination">0</field>
<field name="_direction">0</field>
</implementation>
<handlers>
@ -450,6 +462,17 @@
}
if (doScroll) {
let direction = scrollAmount < 0 ? -1 : 1;
let startPos = this.scrollPosition;
if (!this._isScrolling || this._direction != direction) {
this._destination = startPos + scrollAmount;
this._direction = direction;
} else {
// We were already in the process of scrolling in this direction
this._destination = this._destination + scrollAmount;
scrollAmount = this._destination - startPos;
}
this.scrollByPixels(scrollAmount, instant);
}
@ -536,8 +559,15 @@
]]></handler>
<handler event="scroll"><![CDATA[
this._isScrolling = true;
this._updateScrollButtonsDisabledState();
]]></handler>
<handler event="scrollend"><![CDATA[
this._isScrolling = false;
this._destination = 0;
this._direction = 0;
]]></handler>
</handlers>
</binding>