gecko/accessible/tests/mochitest/layout.js

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/**
* Tests if the given accessible at the given point is expected.
*
* @param aIdentifier [in] accessible identifier
* @param aX [in] x coordinate of the point relative accessible
* @param aY [in] y coordinate of the point relative accessible
* @param aFindDeepestChild [in] points whether deepest or nearest child should
* be returned
* @param aChildIdentifier [in] expected child accessible
*/
function testChildAtPoint(aIdentifier, aX, aY, aFindDeepestChild,
aChildIdentifier)
{
var childAcc = getAccessible(aChildIdentifier);
var actualChildAcc = getChildAtPoint(aIdentifier, aX, aY, aFindDeepestChild);
var msg = "Wrong " + (aFindDeepestChild ? "deepest" : "direct");
msg += " child accessible [" + prettyName(actualChildAcc);
msg += "] at the point (" + aX + ", " + aY + ") of accessible [";
msg += prettyName(aIdentifier) + "]";
is(childAcc, actualChildAcc, msg);
}
/**
* Return child accessible at the given point.
*
* @param aIdentifier [in] accessible identifier
* @param aX [in] x coordinate of the point relative accessible
* @param aY [in] y coordinate of the point relative accessible
* @param aFindDeepestChild [in] points whether deepest or nearest child should
* be returned
* @return the child accessible at the given point
*/
function getChildAtPoint(aIdentifier, aX, aY, aFindDeepestChild)
{
var nodeObj = { value: null };
var acc = getAccessible(aIdentifier, null, nodeObj);
var node = nodeObj.value;
if (!acc || !node)
return;
var [deltaX, deltaY] = getScreenCoords(node);
var x = deltaX + aX;
var y = deltaY + aY;
try {
if (aFindDeepestChild)
return acc.getDeepestChildAtPoint(x, y);
return acc.getChildAtPoint(x, y);
} catch (e) { }
return null;
}
/**
* Return DOM node coordinates relative screen as pair (x, y).
*/
function getScreenCoords(aNode)
{
if (aNode instanceof nsIDOMXULElement)
return [node.boxObject.screenX, node.boxObject.screenY];
// Ugly hack until bug 486200 is fixed.
const XUL_NS = "http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul";
var descr = document.createElementNS(XUL_NS, "description");
descr.setAttribute("value", "helper description");
aNode.parentNode.appendChild(descr);
var descrBoxObject = descr.boxObject;
var descrRect = descr.getBoundingClientRect();
var deltaX = descrBoxObject.screenX - descrRect.left;
var deltaY = descrBoxObject.screenY - descrRect.top;
aNode.parentNode.removeChild(descr);
var rect = aNode.getBoundingClientRect();
return [rect.left + deltaX, rect.top + deltaY];
}