pjs/toolkit/content/widgets/scrollbox.xml

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XML

<?xml version="1.0"?>
<bindings id="arrowscrollboxBindings"
xmlns="http://www.mozilla.org/xbl"
xmlns:xul="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"
xmlns:xbl="http://www.mozilla.org/xbl">
<binding id="scrollbox-base" extends="chrome://global/content/bindings/general.xml#basecontrol">
<resources>
<stylesheet src="chrome://global/skin/scrollbox.css"/>
</resources>
</binding>
<binding id="scrollbox" extends="chrome://global/content/bindings/scrollbox.xml#scrollbox-base">
<content>
<xul:box class="box-inherit scrollbox-innerbox" xbl:inherits="orient,align,pack,dir" flex="1">
<children/>
</xul:box>
</content>
</binding>
<binding id="arrowscrollbox" extends="chrome://global/content/bindings/scrollbox.xml#scrollbox-base">
<content>
<xul:autorepeatbutton class="autorepeatbutton-up"
anonid="scrollbutton-up"
collapsed="true"
xbl:inherits="orient"
oncommand="_autorepeatbuttonScroll(event);"/>
<xul:scrollbox class="arrowscrollbox-scrollbox"
anonid="scrollbox"
flex="1"
xbl:inherits="orient,align,pack,dir">
<children/>
</xul:scrollbox>
<xul:autorepeatbutton class="autorepeatbutton-down"
anonid="scrollbutton-down"
collapsed="true"
xbl:inherits="orient"
oncommand="_autorepeatbuttonScroll(event);"/>
</content>
<implementation>
<destructor><![CDATA[
this._stopSmoothScroll();
]]></destructor>
<field name="_scrollbox">
document.getAnonymousElementByAttribute(this, "anonid", "scrollbox");
</field>
<field name="_scrollButtonUp">
document.getAnonymousElementByAttribute(this, "anonid", "scrollbutton-up");
</field>
<field name="_scrollButtonDown">
document.getAnonymousElementByAttribute(this, "anonid", "scrollbutton-down");
</field>
<field name="__prefBranch">null</field>
<property name="_prefBranch" readonly="true">
<getter><![CDATA[
if (this.__prefBranch === null) {
this.__prefBranch = Components.classes['@mozilla.org/preferences-service;1']
.getService(Components.interfaces.nsIPrefBranch2);
}
return this.__prefBranch;
]]></getter>
</property>
<field name="_scrollIncrement">null</field>
<property name="scrollIncrement" readonly="true">
<getter><![CDATA[
if (this._scrollIncrement === null) {
try {
this._scrollIncrement = this._prefBranch
.getIntPref("toolkit.scrollbox.scrollIncrement");
}
catch (ex) {
this._scrollIncrement = 20;
}
}
return this._scrollIncrement;
]]></getter>
</property>
<field name="_smoothScroll">null</field>
<property name="smoothScroll">
<getter><![CDATA[
if (this._smoothScroll === null) {
if (this.hasAttribute("smoothscroll")) {
this._smoothScroll = (this.getAttribute("smoothscroll") == "true");
} else {
try {
this._smoothScroll = this._prefBranch
.getBoolPref("toolkit.scrollbox.smoothScroll");
}
catch (ex) {
this._smoothScroll = true;
}
}
}
return this._smoothScroll;
]]></getter>
<setter><![CDATA[
this._smoothScroll = val;
return val;
]]></setter>
</property>
<field name="_scrollBoxObject">null</field>
<property name="scrollBoxObject" readonly="true">
<getter><![CDATA[
if (!this._scrollBoxObject) {
this._scrollBoxObject =
this._scrollbox.boxObject
.QueryInterface(Components.interfaces.nsIScrollBoxObject);
}
return this._scrollBoxObject;
]]></getter>
</property>
<property name="scrollClientRect" readonly="true">
<getter><![CDATA[
return this._scrollbox.getBoundingClientRect();
]]></getter>
</property>
<property name="scrollClientSize" readonly="true">
<getter><![CDATA[
return this.orient == "vertical" ?
this._scrollbox.clientHeight :
this._scrollbox.clientWidth;
]]></getter>
</property>
<property name="scrollSize" readonly="true">
<getter><![CDATA[
return this.orient == "vertical" ?
this._scrollbox.scrollHeight :
this._scrollbox.scrollWidth;
]]></getter>
</property>
<property name="scrollPaddingRect" readonly="true">
<getter><![CDATA[
// This assumes that this._scrollbox doesn't have any border.
var outerRect = this.scrollClientRect;
var innerRect = {};
innerRect.left = outerRect.left - this._scrollbox.scrollLeft;
innerRect.top = outerRect.top - this._scrollbox.scrollTop;
innerRect.right = innerRect.left + this._scrollbox.scrollWidth;
innerRect.bottom = innerRect.top + this._scrollbox.scrollHeight;
return innerRect;
]]></getter>
</property>
<property name="scrollboxPaddingStart" readonly="true">
<getter><![CDATA[
var ltr = (window.getComputedStyle(this, null).direction == "ltr");
var paddingStartName = ltr ? "padding-left" : "padding-right";
var scrollboxStyle = window.getComputedStyle(this._scrollbox, null);
return parseFloat(scrollboxStyle.getPropertyValue(paddingStartName));
]]></getter>
</property>
<property name="scrollPosition">
<getter><![CDATA[
return this.orient == "vertical" ?
this._scrollbox.scrollTop :
this._scrollbox.scrollLeft;
]]></getter>
<setter><![CDATA[
if (this.orient == "vertical")
this._scrollbox.scrollTop = val;
else
this._scrollbox.scrollLeft = val;
return val;
]]></setter>
</property>
<property name="_startEndProps" readonly="true">
<getter><![CDATA[
return this.orient == "vertical" ?
["top", "bottom"] : ["left", "right"];
]]></getter>
</property>
<field name="_isRTLScrollbox"><![CDATA[
this.orient != "vertical" &&
document.defaultView.getComputedStyle(this._scrollbox, "").direction == "rtl";
]]></field>
<field name="_scrollTarget">null</field>
<method name="_canScrollToElement">
<parameter name="element"/>
<body>
return true;
</body>
</method>
<method name="ensureElementIsVisible">
<parameter name="element"/>
<parameter name="aSmoothScroll"/>
<body><![CDATA[
if (!this._canScrollToElement(element))
return;
var vertical = this.orient == "vertical";
var rect = this.scrollClientRect;
var containerStart = vertical ? rect.top : rect.left;
var containerEnd = vertical ? rect.bottom : rect.right;
rect = element.getBoundingClientRect();
var elementStart = vertical ? rect.top : rect.left;
var elementEnd = vertical ? rect.bottom : rect.right;
var scrollPaddingRect = this.scrollPaddingRect;
let style = window.getComputedStyle(this._scrollbox, null);
var scrollContentRect = {
left: scrollPaddingRect.left + parseFloat(style.paddingLeft),
top: scrollPaddingRect.top + parseFloat(style.paddingTop),
right: scrollPaddingRect.right - parseFloat(style.paddingRight),
bottom: scrollPaddingRect.bottom - parseFloat(style.paddingBottom)
};
if (elementStart <= (vertical ? scrollContentRect.top : scrollContentRect.left)) {
elementStart = vertical ? scrollPaddingRect.top : scrollPaddingRect.left;
}
if (elementEnd >= (vertical ? scrollContentRect.bottom : scrollContentRect.right)) {
elementEnd = vertical ? scrollPaddingRect.bottom : scrollPaddingRect.right;
}
var amountToScroll;
if (elementStart < containerStart) {
amountToScroll = elementStart - containerStart;
} else if (containerEnd < elementEnd) {
amountToScroll = elementEnd - containerEnd;
} else if (this._isScrolling) {
// decelerate if a currently-visible element is selected during the scroll
const STOP_DISTANCE = 15;
if (this._isScrolling == -1 && elementStart - STOP_DISTANCE < containerStart)
amountToScroll = elementStart - containerStart;
else if (this._isScrolling == 1 && containerEnd - STOP_DISTANCE < elementEnd)
amountToScroll = elementEnd - containerEnd;
else
amountToScroll = this._isScrolling * STOP_DISTANCE;
} else {
return;
}
this._stopSmoothScroll();
if (aSmoothScroll != false && this.smoothScroll) {
this._smoothScrollByPixels(amountToScroll, element);
} else {
this.scrollByPixels(amountToScroll);
}
]]></body>
</method>
<method name="_smoothScrollByPixels">
<parameter name="amountToScroll"/>
<parameter name="element"/><!-- optional -->
<body><![CDATA[
this._stopSmoothScroll();
if (amountToScroll == 0)
return;
this._scrollTarget = element;
// Positive amountToScroll makes us scroll right (elements fly left), negative scrolls left.
this._isScrolling = amountToScroll < 0 ? -1 : 1;
this._scrollAnim.start(amountToScroll);
]]></body>
</method>
<field name="_scrollAnim"><![CDATA[({
scrollbox: this,
start: function scrollAnim_start(distance) {
this.distance = distance;
this.startPos = this.scrollbox.scrollPosition;
this.duration = Math.min(1000, Math.round(50 * Math.sqrt(Math.abs(distance))));
this.startTime = window.mozAnimationStartTime;
window.addEventListener("MozBeforePaint", this, false);
window.mozRequestAnimationFrame();
},
stop: function scrollAnim_stop() {
window.removeEventListener("MozBeforePaint", this, false);
},
handleEvent: function scrollAnim_handleEvent(event) {
const timePassed = event.timeStamp - this.startTime;
const pos = timePassed >= this.duration ? 1 :
1 - Math.pow(1 - timePassed / this.duration, 4);
this.scrollbox.scrollPosition = this.startPos + (this.distance * pos);
if (pos == 1)
this.scrollbox._stopSmoothScroll();
else
window.mozRequestAnimationFrame();
}
})]]></field>
<method name="scrollByIndex">
<parameter name="index"/>
<parameter name="aSmoothScroll"/>
<body><![CDATA[
if (index == 0)
return;
// Each scrollByIndex call is expected to scroll the given number of
// items. If a previous call is still in progress because of smooth
// scrolling, we need to complete it before starting a new one.
if (this._scrollTarget) {
let elements = this._getScrollableElements();
if (this._scrollTarget != elements[0] &&
this._scrollTarget != elements[elements.length - 1])
this.ensureElementIsVisible(this._scrollTarget, false);
}
var rect = this.scrollClientRect;
var [start, end] = this._startEndProps;
var x = index > 0 ? rect[end] + 1 : rect[start] - 1;
var nextElement = this._elementFromPoint(x, index);
if (!nextElement)
return;
var targetElement;
if (this._isRTLScrollbox)
index *= -1;
while (index < 0 && nextElement) {
if (this._canScrollToElement(nextElement))
targetElement = nextElement;
nextElement = nextElement.previousSibling;
index++;
}
while (index > 0 && nextElement) {
if (this._canScrollToElement(nextElement))
targetElement = nextElement;
nextElement = nextElement.nextSibling;
index--;
}
if (!targetElement)
return;
this.ensureElementIsVisible(targetElement, aSmoothScroll);
]]></body>
</method>
<method name="_getScrollableElements">
<body><![CDATA[
var nodes = this.hasChildNodes() ?
this.childNodes : document.getBindingParent(this).childNodes;
return Array.filter(nodes, this._canScrollToElement, this);
]]></body>
</method>
<method name="_elementFromPoint">
<parameter name="aX"/>
<parameter name="aPhysicalScrollDir"/>
<body><![CDATA[
var elements = this._getScrollableElements();
if (!elements.length)
return null;
if (this._isRTLScrollbox)
elements.reverse();
var [start, end] = this._startEndProps;
var low = 0;
var high = elements.length - 1;
if (aX < elements[low].getBoundingClientRect()[start] ||
aX > elements[high].getBoundingClientRect()[end])
return null;
var mid, rect;
while (low <= high) {
mid = Math.floor((low + high) / 2);
rect = elements[mid].getBoundingClientRect();
if (rect[start] > aX)
high = mid - 1;
else if (rect[end] < aX)
low = mid + 1;
else
return elements[mid];
}
// There's no element at the requested coordinate, but the algorithm
// from above yields an element next to it, in a random direction.
// The desired scrolling direction leads to the correct element.
if (!aPhysicalScrollDir)
return null;
if (aPhysicalScrollDir < 0 && rect[start] > aX)
mid = Math.max(mid - 1, 0);
else if (aPhysicalScrollDir > 0 && rect[end] < aX)
mid = Math.min(mid + 1, elements.length - 1);
return elements[mid];
]]></body>
</method>
<method name="_autorepeatbuttonScroll">
<parameter name="event"/>
<body><![CDATA[
var dir = event.originalTarget == this._scrollButtonUp ? -1 : 1;
if (this._isRTLScrollbox)
dir *= -1;
this.scrollByPixels(this.scrollIncrement * dir);
event.stopPropagation();
]]></body>
</method>
<method name="scrollByPixels">
<parameter name="px"/>
<body><![CDATA[
this.scrollPosition += px;
]]></body>
</method>
<!-- 0: idle
1: scrolling right
-1: scrolling left -->
<field name="_isScrolling">0</field>
<field name="_prevMouseScrolls">[null, null]</field>
<method name="_stopSmoothScroll">
<body><![CDATA[
if (this._isScrolling) {
this._scrollAnim.stop();
this._isScrolling = 0;
this._scrollTarget = null;
}
]]></body>
</method>
<method name="_updateScrollButtonsDisabledState">
<body><![CDATA[
var disableUpButton = false;
var disableDownButton = false;
if (this.scrollPosition == 0) {
// In the RTL case, this means the _last_ element in the
// scrollbox is visible
if (this._isRTLScrollbox)
disableDownButton = true;
else
disableUpButton = true;
}
else if (this.scrollClientSize + this.scrollPosition == this.scrollSize) {
// In the RTL case, this means the _first_ element in the
// scrollbox is visible
if (this._isRTLScrollbox)
disableUpButton = true;
else
disableDownButton = true;
}
this._scrollButtonUp.disabled = disableUpButton;
this._scrollButtonDown.disabled = disableDownButton;
]]></body>
</method>
</implementation>
<handlers>
<handler event="DOMMouseScroll"><![CDATA[
if (this.orient == "vertical") {
// prevent horizontal scrolling from scrolling a vertical scrollbox
if (event.axis == event.HORIZONTAL_AXIS)
return;
this.scrollByIndex(event.detail);
}
// We allow vertical scrolling to scroll a horizontal scrollbox
// because many users have a vertical scroll wheel but no
// horizontal support.
// Because of this, we need to avoid scrolling chaos on trackpads
// and mouse wheels that support simultaneous scrolling in both axes.
// We do this by scrolling only when the last two scroll events were
// on the same axis as the current scroll event.
else {
let isVertical = event.axis == event.VERTICAL_AXIS;
if (this._prevMouseScrolls.every(function(prev) prev == isVertical))
this.scrollByIndex(this._isRTLScrollbox ? -event.detail : event.detail);
if (this._prevMouseScrolls.length > 1)
this._prevMouseScrolls.shift();
this._prevMouseScrolls.push(isVertical);
}
event.stopPropagation();
]]></handler>
<handler event="underflow" phase="capturing"><![CDATA[
// filter underflow events which were dispatched on nested scrollboxes
if (event.target != this)
return;
// Ignore events that doesn't match our orientation.
// Scrollport event orientation:
// 0: vertical
// 1: horizontal
// 2: both
if (this.orient == "vertical") {
if (event.detail == 1)
return;
}
else { // horizontal scrollbox
if (event.detail == 0)
return;
}
this._scrollButtonUp.collapsed = true;
this._scrollButtonDown.collapsed = true;
try {
// See bug 341047 and comments in overflow handler as to why
// try..catch is needed here
let childNodes = this._getScrollableElements();
if (childNodes && childNodes.length)
this.ensureElementIsVisible(childNodes[0], false);
}
catch(e) {
this._scrollButtonUp.collapsed = false;
this._scrollButtonDown.collapsed = false;
}
]]></handler>
<handler event="overflow" phase="capturing"><![CDATA[
// filter underflow events which were dispatched on nested scrollboxes
if (event.target != this)
return;
// Ignore events that doesn't match our orientation.
// Scrollport event orientation:
// 0: vertical
// 1: horizontal
// 2: both
if (this.orient == "vertical") {
if (event.detail == 1)
return;
}
else { // horizontal scrollbox
if (event.detail == 0)
return;
}
this._scrollButtonUp.collapsed = false;
this._scrollButtonDown.collapsed = false;
try {
// See bug 341047, the overflow event is dispatched when the
// scrollbox already is mostly destroyed. This causes some code in
// _updateScrollButtonsDisabledState() to throw an error. It also
// means that the scrollbarbuttons were uncollapsed when that should
// not be happening, because the whole overflow event should not be
// happening in that case.
this._updateScrollButtonsDisabledState();
}
catch(e) {
this._scrollButtonUp.collapsed = true;
this._scrollButtonDown.collapsed = true;
}
]]></handler>
<handler event="scroll" action="this._updateScrollButtonsDisabledState()"/>
</handlers>
</binding>
<binding id="autorepeatbutton" extends="chrome://global/content/bindings/scrollbox.xml#scrollbox-base">
<content repeat="hover">
<xul:image class="autorepeatbutton-icon"/>
</content>
</binding>
<binding id="arrowscrollbox-clicktoscroll" extends="chrome://global/content/bindings/scrollbox.xml#arrowscrollbox">
<content>
<xul:toolbarbutton class="scrollbutton-up" collapsed="true"
xbl:inherits="orient"
anonid="scrollbutton-up"
onclick="_distanceScroll(event);"
onmousedown="if (event.button == 0) _startScroll(-1);"
onmouseup="if (event.button == 0) _stopScroll();"
onmouseover="_continueScroll(-1);"
onmouseout="_pauseScroll();"/>
<xul:scrollbox class="arrowscrollbox-scrollbox"
anonid="scrollbox"
flex="1"
xbl:inherits="orient,align,pack,dir">
<children/>
</xul:scrollbox>
<xul:toolbarbutton class="scrollbutton-down" collapsed="true"
xbl:inherits="orient"
anonid="scrollbutton-down"
onclick="_distanceScroll(event);"
onmousedown="if (event.button == 0) _startScroll(1);"
onmouseup="if (event.button == 0) _stopScroll();"
onmouseover="_continueScroll(1);"
onmouseout="_pauseScroll();"/>
</content>
<implementation implements="nsITimerCallback, nsIDOMEventListener">
<constructor><![CDATA[
try {
this._scrollDelay = this._prefBranch
.getIntPref("toolkit.scrollbox.clickToScroll.scrollDelay");
}
catch (ex) {
}
]]></constructor>
<destructor><![CDATA[
// Release timer to avoid reference cycles.
if (this._scrollTimer) {
this._scrollTimer.cancel();
this._scrollTimer = null;
}
]]></destructor>
<field name="_scrollIndex">0</field>
<field name="_scrollDelay">150</field>
<method name="notify">
<parameter name="aTimer"/>
<body>
<![CDATA[
if (!document)
aTimer.cancel();
if (this.smoothScroll)
this.scrollByPixels(25 * this._scrollIndex);
else
this.scrollByIndex(this._scrollIndex);
]]>
</body>
</method>
<method name="_startScroll">
<parameter name="index"/>
<body><![CDATA[
if (this._isRTLScrollbox)
index *= -1;
this._scrollIndex = index;
var scrollDelay = this.smoothScroll ? 60 : this._scrollDelay;
if (!this._scrollTimer)
this._scrollTimer =
Components.classes["@mozilla.org/timer;1"]
.createInstance(Components.interfaces.nsITimer);
else
this._scrollTimer.cancel();
this._scrollTimer.initWithCallback(this, scrollDelay,
this._scrollTimer.TYPE_REPEATING_SLACK);
this.notify(this._scrollTimer);
this._mousedown = true;
]]>
</body>
</method>
<method name="_stopScroll">
<body><![CDATA[
if (this._scrollTimer)
this._scrollTimer.cancel();
this._mousedown = false;
if (!this._scrollIndex || !this.smoothScroll)
return;
this.scrollByIndex(this._scrollIndex);
this._scrollIndex = 0;
]]></body>
</method>
<method name="_pauseScroll">
<body><![CDATA[
if (this._mousedown) {
this._stopScroll();
this._mousedown = true;
document.addEventListener("mouseup", this, false);
document.addEventListener("blur", this, true);
}
]]></body>
</method>
<method name="_continueScroll">
<parameter name="index"/>
<body><![CDATA[
if (this._mousedown)
this._startScroll(index);
]]></body>
</method>
<method name="handleEvent">
<parameter name="aEvent"/>
<body><![CDATA[
if (aEvent.type == "mouseup" ||
aEvent.type == "blur" && aEvent.target == document) {
this._mousedown = false;
document.removeEventListener("mouseup", this, false);
document.removeEventListener("blur", this, true);
}
]]></body>
</method>
<method name="_distanceScroll">
<parameter name="aEvent"/>
<body><![CDATA[
if (aEvent.detail < 2 || aEvent.detail > 3)
return;
var scrollBack = (aEvent.originalTarget == this._scrollButtonUp);
var scrollLeftOrUp = this._isRTLScrollbox ? !scrollBack : scrollBack;
var targetElement;
if (aEvent.detail == 2) {
// scroll by the size of the scrollbox
let [start, end] = this._startEndProps;
let x;
if (scrollLeftOrUp)
x = this.scrollClientRect[start] - this.scrollClientSize;
else
x = this.scrollClientRect[end] + this.scrollClientSize;
targetElement = this._elementFromPoint(x, scrollLeftOrUp ? -1 : 1);
// the next partly-hidden element will become fully visible,
// so don't scroll too far
if (targetElement)
targetElement = scrollBack ?
targetElement.nextSibling :
targetElement.previousSibling;
}
if (!targetElement) {
// scroll to the first resp. last element
let elements = this._getScrollableElements();
targetElement = scrollBack ?
elements[0] :
elements[elements.length - 1];
}
this.ensureElementIsVisible(targetElement);
]]></body>
</method>
</implementation>
</binding>
</bindings>