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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
import {
getBestRectForElement,
getElementFromPoint,
/**
* This class is used to get the dimensions of hovered elements within iframes.
* The main content process cannot get the dimensions of elements within
* iframes so a message will be send to this actor to get the dimensions of the
* element for a given point inside the iframe.
*/
export class ScreenshotsHelperChild extends JSWindowActorChild {
receiveMessage(message) {
if (message.name === "ScreenshotsHelper:GetElementRectFromPoint") {
return this.getBestElementRectFromPoint(message.data);
}
return null;
}
async getBestElementRectFromPoint(data) {
let { x, y } = data;
x -= this.contentWindow.mozInnerScreenX;
y -= this.contentWindow.mozInnerScreenY;
let { ele, rect } = await getElementFromPoint(x, y, this.document);
if (!rect) {
rect = getBestRectForElement(ele, this.document);
}
if (rect) {
rect = {
left: rect.left + this.contentWindow.mozInnerScreenX,
right: rect.right + this.contentWindow.mozInnerScreenX,
top: rect.top + this.contentWindow.mozInnerScreenY,
bottom: rect.bottom + this.contentWindow.mozInnerScreenY,
};
}
return rect;
}
}