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/* Any copyright is dedicated to the Public Domain.
* http://creativecommons.org/publicdomain/zero/1.0/ */
function is_hidden(aElement) {
var style = aElement.ownerDocument.defaultView.getComputedStyle(aElement, "");
if (style.display == "none")
return true;
if (style.visibility != "visible")
return true;
// Hiding a parent element will hide all its children
if (aElement.parentNode != aElement.ownerDocument)
return is_hidden(aElement.parentNode);
return false;
}
function is_element_visible(aElement, aMsg) {
isnot(aElement, null, "Element should not be null, when checking visibility");
ok(!is_hidden(aElement), aMsg);
}
function is_element_hidden(aElement, aMsg) {
isnot(aElement, null, "Element should not be null, when checking visibility");
ok(is_hidden(aElement), aMsg);
}
function open_preferences(aCallback) {
gBrowser.selectedTab = gBrowser.addTab("about:preferences");
let newTabBrowser = gBrowser.getBrowserForTab(gBrowser.selectedTab);
newTabBrowser.addEventListener("Initialized", function () {
newTabBrowser.removeEventListener("Initialized", arguments.callee, true);
aCallback(gBrowser.contentWindow);
}, true);
}
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