(function() {
"use strict";
function getInViewCenterPoint(rect) {
var left = Math.max(0, rect.left);
var right = Math.min(window.innerWidth, rect.right);
var top = Math.max(0, rect.top);
var bottom = Math.min(window.innerHeight, rect.bottom);
var x = 0.5 * (left + right);
var y = 0.5 * (top + bottom);
return [x, y];
}
function getPointerInteractablePaintTree(element) {
if (!window.document.contains(element)) {
return [];
}
var rectangles = element.getClientRects();
if (rectangles.length === 0) {
return [];
}
var centerPoint = getInViewCenterPoint(rectangles[0]);
if ("elementsFromPoint" in document) {
return document.elementsFromPoint(centerPoint[0], centerPoint[1]);
} else if ("msElementsFromPoint" in document) {
var rv = document.msElementsFromPoint(centerPoint[0], centerPoint[1]);
return Array.prototype.slice.call(rv ? rv : []);
} else {
throw new Error("document.elementsFromPoint unsupported");
}
}
function inView(element) {
var pointerInteractablePaintTree = getPointerInteractablePaintTree(element);
return pointerInteractablePaintTree.indexOf(element) !== -1;
}
/**
* @namespace
*/
window.test_driver = {
/**
* Triggers a user-initiated click
*
* This matches the behaviour of the {@link
* https://w3c.github.io/webdriver/webdriver-spec.html#element-click|WebDriver
* Element Click command}.
*
* @param {Element} element - element to be clicked
* @returns {Promise} fulfilled after click occurs, or rejected in
* the cases the WebDriver command errors
*/
click: function(element) {
if (window.top !== window) {
return Promise.reject(new Error("can only click in top-level window"));
}
if (!window.document.contains(element)) {
return Promise.reject(new Error("element in different document or shadow tree"));
}
if (!inView(element)) {
element.scrollIntoView({behavior: "instant",
block: "end",
inline: "nearest"});
}
var pointerInteractablePaintTree = getPointerInteractablePaintTree(element);
if (pointerInteractablePaintTree.length === 0 ||
!element.contains(pointerInteractablePaintTree[0])) {
return Promise.reject(new Error("element click intercepted error"));
}
var rect = element.getClientRects()[0];
var centerPoint = getInViewCenterPoint(rect);
return window.test_driver_internal.click(element,
{x: centerPoint[0],
y: centerPoint[1]});
}
};
window.test_driver_internal = {
/**
* Triggers a user-initated click
*
* @param {Element} element - element to be clicked
* @param {{x: number, y: number} coords - viewport coordinates to click at
* @returns {Promise} fulfilled after click occurs or rejected if click fails
*/
click: function(element, coords) {
return Promise.reject(new Error("unimplemented"));
}
};
})();