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add shadow dom v1 support to DOM atoms #5762

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merged 9 commits into from
Apr 30, 2018
Merged

add shadow dom v1 support to DOM atoms #5762

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b792946
add shadow dom v1 support to getVisibleText
43081j Apr 11, 2018
3db00d0
remove invalid multiple-root test
43081j Apr 11, 2018
ae758b0
rewrite shadow dom tests for v1
43081j Apr 18, 2018
914f185
fix shadow dom tests
43081j Apr 22, 2018
4ccbd05
simplify shadow dom traversal
43081j Apr 23, 2018
de818f1
only assert styles of elements
43081j Apr 23, 2018
4c0c8a3
return early when retrieving DOM parents
43081j Apr 23, 2018
a34a2a7
move displayed to a function
43081j Apr 23, 2018
8da6a65
fix jsdoc
43081j Apr 24, 2018
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93 changes: 53 additions & 40 deletions javascript/atoms/dom.js
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Original file line number Diff line number Diff line change
Expand Up @@ -565,45 +565,40 @@ bot.dom.isShown_ = function(elem, ignoreOpacity, parentsDisplayedFn) {
* @return {boolean} Whether or not the element is visible.
*/
bot.dom.isShown = function(elem, opt_ignoreOpacity) {
var displayed;

if (bot.dom.IS_SHADOW_DOM_ENABLED) {
// Any element with a display style equal to 'none' or that has an ancestor
// with display style equal to 'none' is not shown.
displayed = function(e) {
if (bot.dom.getEffectiveStyle(e, 'display') == 'none') {
/**
* Determines whether an element or its parents have `display: none` set
* @param {!Node} e the element
* @return {boolean}
*/
function displayed(e) {
if (bot.dom.isElement(e)) {
var elem = /** @type {!Element} */ (e);
if (bot.dom.getEffectiveStyle(elem, 'display') == 'none') {
return false;
}
var parent;
do {
parent = bot.dom.getParentNodeInComposedDom(e);
if (parent instanceof ShadowRoot) {
if (parent.host.shadowRoot != parent) {
// There is a younger shadow root, which will take precedence over
// the shadow this element is in, thus this element won't be
// displayed.
return false;
} else {
parent = parent.host;
}
} else if (parent && (parent.nodeType == goog.dom.NodeType.DOCUMENT ||
parent.nodeType == goog.dom.NodeType.DOCUMENT_FRAGMENT)) {
parent = null;
}
} while (elem && elem.nodeType != goog.dom.NodeType.ELEMENT);
return !parent || displayed(parent);
};
} else {
// Any element with a display style equal to 'none' or that has an ancestor
// with display style equal to 'none' is not shown.
displayed = function(e) {
if (bot.dom.getEffectiveStyle(e, 'display') == 'none') {
}

var parent = bot.dom.getParentNodeInComposedDom(e);

if (bot.dom.IS_SHADOW_DOM_ENABLED && (parent instanceof ShadowRoot)) {
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@jleyba take a look at this now. so we no longer need an if/else as the parent node traversal already checks if shadow dom v0 or v1 is supported.

and this means now we automatically get the document/shadowRoot assertion further down and disconnected elements are falsey.

if (parent.host.shadowRoot !== parent) {
// There is a younger shadow root, which will take precedence over
// the shadow this element is in, thus this element won't be
// displayed.
return false;
} else {
parent = parent.host;
}
var parent = bot.dom.getParentElement(e);
return !parent || displayed(parent);
};
}

if (parent && (parent.nodeType == goog.dom.NodeType.DOCUMENT ||
parent.nodeType == goog.dom.NodeType.DOCUMENT_FRAGMENT)) {
return true;
}

return parent && displayed(parent);
}

return bot.dom.isShown_(elem, !!opt_ignoreOpacity, displayed);
};

Expand Down Expand Up @@ -1260,12 +1255,22 @@ bot.dom.getOpacityNonIE_ = function(elem) {
*/
bot.dom.getParentNodeInComposedDom = function(node) {
var /**@type {Node}*/ parent = node.parentNode;

// Shadow DOM v1
if (parent.shadowRoot && node.assignedSlot !== undefined) {
// Can be null on purpose, meaning it has no parent as
// it hasn't yet been slotted
return node.assignedSlot ? node.assignedSlot.parentNode : null;
}

// Shadow DOM V0 (deprecated)
if (node.getDestinationInsertionPoints) {
var destinations = node.getDestinationInsertionPoints();
if (destinations.length > 0) {
parent = destinations[destinations.length - 1];
return destinations[destinations.length - 1];
}
}

return parent;
};

Expand All @@ -1289,16 +1294,22 @@ bot.dom.appendVisibleTextLinesFromNodeInComposedDom_ = function(
} else if (bot.dom.isElement(node)) {
var castElem = /** @type {!Element} */ (node);

if (bot.dom.isElement(node, 'CONTENT')) {
if (bot.dom.isElement(node, 'CONTENT') || bot.dom.isElement(node, 'SLOT')) {
var parentNode = node;
while (parentNode.parentNode) {
parentNode = parentNode.parentNode;
}
if (parentNode instanceof ShadowRoot) {
// If the element is <content> and we're inside a shadow DOM then just
// If the element is <content> and we're inside a shadow DOM then just
// append the contents of the nodes that have been distributed into it.
var contentElem = /** @type {!Object} */ (node);
goog.array.forEach(contentElem.getDistributedNodes(), function(node) {
var shadowChildren;
if (bot.dom.isElement(node, 'CONTENT')) {
shadowChildren = contentElem.getDistributedNodes();
} else {
shadowChildren = contentElem.assignedNodes();
}
goog.array.forEach(shadowChildren, function(node) {
bot.dom.appendVisibleTextLinesFromNodeInComposedDom_(
node, lines, shown, whitespace, textTransform);
});
Expand Down Expand Up @@ -1353,8 +1364,10 @@ bot.dom.isNodeDistributedIntoShadowDom = function(node) {
elemOrText = /** @type {!Text} */ (node);
}
return elemOrText != null &&
elemOrText.getDestinationInsertionPoints &&
elemOrText.getDestinationInsertionPoints().length > 0;
(elemOrText.assignedSlot != null ||
(elemOrText.getDestinationInsertionPoints &&
elemOrText.getDestinationInsertionPoints().length > 0)
);
};


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