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var timer = require("timer");
function PersistentPageMod(window, callback) {
memory.track(this);
this.window = window;
this.callback = callback;
this.window.addEventListener("unload", this, false);
this.window.addEventListener("DOMSubtreeModified", this, false);
this.doMod();
require("unload-2").ensure(this);
}
PersistentPageMod.prototype = {
REPLACE_DELAY: 100,
doMod: function doMod() {
try {
this.callback.call(undefined, this.window);
} catch (e) {
console.exception(e);
}
this.timerID = null;
},
handleEvent: function handleEvent(event) {
switch (event.type) {
case "unload":
if (event.target == this.window.document)
this.unload();
break;
case "DOMSubtreeModified":
if (this.timerID == null) {
// Wait a bit to do the replacing. Otherwise, we just get called
// tons of times in a tiny period and end up hanging the browser
// for a while.
var self = this;
this.timerID = timer.setTimeout(function() self.doMod(),
this.REPLACE_DELAY);
}
break;
}
},
unload: function unload() {
if (this.timerID != null) {
timer.clearTimeout(this.timerID);
this.timerID = null;
}
this.window.removeEventListener("DOMSubtreeModified", this, false);
this.window.removeEventListener("unload", this, false);
}
};
require("errors").catchAndLogProps(PersistentPageMod.prototype,
"handleEvent");
var register = exports.register = function register(window, callback) {
new PersistentPageMod(window, callback);
};
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