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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
"use strict";
/**
* A ReflowObserver that listens for reflow events from the page.
* Implements nsIReflowObserver.
*
* @constructor
* @param object window
* The window for which we need to track reflow.
* @param object owner
* The listener owner which needs to implement:
* - onReflowActivity(reflowInfo)
*/
function ConsoleReflowListener(window, listener) {
this.docshell = window.docShell;
this.listener = listener;
this.docshell.addWeakReflowObserver(this);
}
exports.ConsoleReflowListener = ConsoleReflowListener;
ConsoleReflowListener.prototype = {
QueryInterface: ChromeUtils.generateQI([
"nsIReflowObserver",
"nsISupportsWeakReference",
]),
docshell: null,
listener: null,
/**
* Forward reflow event to listener.
*
* @param DOMHighResTimeStamp start
* @param DOMHighResTimeStamp end
* @param boolean interruptible
*/
sendReflow(start, end, interruptible) {
const frame = Components.stack.caller.caller;
let filename = frame ? frame.filename : null;
if (filename) {
// Because filename could be of the form "xxx.js -> xxx.js -> xxx.js",
// we only take the last part.
filename = filename.split(" ").pop();
}
this.listener.onReflowActivity({
interruptible,
start,
end,
sourceURL: filename,
sourceLine: frame ? frame.lineNumber : null,
functionName: frame ? frame.name : null,
});
},
/**
* On uninterruptible reflow
*
* @param DOMHighResTimeStamp start
* @param DOMHighResTimeStamp end
*/
reflow(start, end) {
this.sendReflow(start, end, false);
},
/**
* On interruptible reflow
*
* @param DOMHighResTimeStamp start
* @param DOMHighResTimeStamp end
*/
reflowInterruptible(start, end) {
this.sendReflow(start, end, true);
},
/**
* Unregister listener.
*/
destroy() {
this.docshell.removeWeakReflowObserver(this);
this.listener = this.docshell = null;
},
};