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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
* file, you can obtain one at http://mozilla.org/MPL/2.0/. */
const EXPORTED_SYMBOLS = ["UIDensity"];
const { XPCOMUtils } = ChromeUtils.importESModule(
"resource://gre/modules/XPCOMUtils.sys.mjs"
);
var registeredWindows = new Set();
function updateWindow(win) {
switch (UIDensity.prefValue) {
case UIDensity.MODE_COMPACT:
win.document.documentElement.setAttribute("uidensity", "compact");
break;
case UIDensity.MODE_TOUCH:
win.document.documentElement.setAttribute("uidensity", "touch");
break;
default:
win.document.documentElement.removeAttribute("uidensity");
break;
}
if (win.TabsInTitlebar !== undefined) {
win.TabsInTitlebar.update();
}
win.dispatchEvent(
new win.CustomEvent("uidensitychange", { detail: UIDensity.prefValue })
);
}
function updateAllWindows() {
for (let win of registeredWindows) {
updateWindow(win);
}
}
var UIDensity = {
MODE_COMPACT: 0,
MODE_NORMAL: 1,
MODE_TOUCH: 2,
prefName: "mail.uidensity",
/**
* Set the UI density.
*
* @param {integer} mode - One of the MODE constants.
*/
setMode(mode) {
Services.prefs.setIntPref(this.prefName, mode);
},
/**
* Register a window to be updated if the mode ever changes. The current
* value is applied to the window. Deregistration is automatic.
*
* @param {Window} win
*/
registerWindow(win) {
registeredWindows.add(win);
win.addEventListener("unload", () => registeredWindows.delete(win));
updateWindow(win);
},
};
XPCOMUtils.defineLazyPreferenceGetter(
UIDensity,
"prefValue",
UIDensity.prefName,
null,
updateAllWindows
);
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