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content.js
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content.js
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const iframeClickAction = "iframeClick";
const isTopMostWindow = () => window.self === window.top;
const sendClickToBackground = (e) => {
chrome.runtime.sendMessage({
type: "contentClickAction",
payload: {
coords: {
x: e.clientX,
y: e.clientY,
},
devicePixelRatio: window.devicePixelRatio, // can be re-trieved on background size?
},
});
};
const sendMessageToParentWindow = (targetWindow, event) => {
targetWindow.postMessage(
JSON.stringify({
type: iframeClickAction,
payload: {
event: {
clientX: event.clientX,
clientY: event.clientY,
},
},
}),
"*"
);
};
// chrome.runtime.sendMessage("contentMounted");
document.addEventListener(
"click",
function (e) {
if (isTopMostWindow()) {
// topmost window
sendClickToBackground({
clientX: e.clientX,
clientY: e.clientY,
});
} else {
// embedded window
try {
sendMessageToParentWindow(e.target.ownerDocument.defaultView.parent, {
clientX: e.clientX,
clientY: e.clientY,
});
} catch (error) {
console.error(error);
}
}
},
true
);
window.addEventListener("message", function (messageEvent) {
// TODO: check all frames to find which one sent message
console.log(messageEvent);
try {
const { type, payload } = JSON.parse(messageEvent.data);
if (typeof type === "string" && type === iframeClickAction) {
const frameOffset = {
x: 0,
y: 0,
};
// Find message source iframe
const currentWindowIframes = document.getElementsByTagName("IFRAME");
for (let i = 0; i < currentWindowIframes.length; i++) {
const iframe = currentWindowIframes[i];
// Cross-browser way to get iframe's window object
const frameWindow =
iframe.contentWindow || iframe.contentDocument.defaultView;
// Comparison
if (messageEvent.source === frameWindow) {
// get relative offset
const iframeRect = iframe.getBoundingClientRect();
frameOffset.x = Math.max(0, iframeRect.x);
frameOffset.y = Math.max(0, iframeRect.y);
}
}
// calculate iframe sender offset
const { event } = payload;
const nextEvent = {
clientX: Number(event.clientX) + frameOffset.x,
clientY: Number(event.clientY) + frameOffset.y,
};
if (isTopMostWindow()) {
sendClickToBackground(nextEvent);
} else {
sendMessageToParentWindow(window.parent, nextEvent);
}
}
} catch (error) {
console.error(error);
}
});