forked from mirrors/gecko-dev
82 lines
2.2 KiB
JavaScript
82 lines
2.2 KiB
JavaScript
/* 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 file,
|
|
* You can obtain one at http://mozilla.org/MPL/2.0/. */
|
|
|
|
/**
|
|
* LightweightThemeChild forwards theme data to in-content pages.
|
|
*/
|
|
export class LightweightThemeChild extends JSWindowActorChild {
|
|
constructor() {
|
|
super();
|
|
this._initted = false;
|
|
Services.cpmm.sharedData.addEventListener("change", this);
|
|
}
|
|
|
|
didDestroy() {
|
|
Services.cpmm.sharedData.removeEventListener("change", this);
|
|
}
|
|
|
|
_getChromeOuterWindowID() {
|
|
try {
|
|
// Getting the browserChild throws an exception when it is null.
|
|
let browserChild = this.docShell.browserChild;
|
|
if (browserChild) {
|
|
return browserChild.chromeOuterWindowID;
|
|
}
|
|
} catch (ex) {}
|
|
|
|
if (
|
|
Services.appinfo.processType === Services.appinfo.PROCESS_TYPE_DEFAULT
|
|
) {
|
|
return this.browsingContext.topChromeWindow.docShell.outerWindowID;
|
|
}
|
|
|
|
// Return a false-y outerWindowID if we can't manage to get a proper one.
|
|
// Note that no outerWindowID will ever have this ID.
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* Handles "change" events on the child sharedData map, and notifies
|
|
* our content page if its theme data was among the changed keys.
|
|
*/
|
|
handleEvent(event) {
|
|
switch (event.type) {
|
|
// Make sure to update the theme data on first page show.
|
|
case "pageshow":
|
|
case "DOMContentLoaded":
|
|
if (!this._initted && this._getChromeOuterWindowID()) {
|
|
this._initted = true;
|
|
this.update();
|
|
}
|
|
break;
|
|
|
|
case "change":
|
|
if (
|
|
event.changedKeys.includes(`theme/${this._getChromeOuterWindowID()}`)
|
|
) {
|
|
this.update();
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Forward the theme data to the page.
|
|
*/
|
|
update() {
|
|
const event = Cu.cloneInto(
|
|
{
|
|
detail: {
|
|
data: Services.cpmm.sharedData.get(
|
|
`theme/${this._getChromeOuterWindowID()}`
|
|
),
|
|
},
|
|
},
|
|
this.contentWindow
|
|
);
|
|
this.contentWindow.dispatchEvent(
|
|
new this.contentWindow.CustomEvent("LightweightTheme:Set", event)
|
|
);
|
|
}
|
|
}
|