/usr/share/gnome-shell/extensions/remove-dropdown-arrows@mpdeimos.com/extension.js is in gnome-shell-extension-remove-dropdown-arrows 9-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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const GLib = imports.gi.GLib;
const Main = imports.ui.main;
const Mainloop = imports.mainloop;
const MAX_RECURSE_DEPTH = 3;
let signalConnections = [];
let dropdowns = [];
/**
* Try hide a single dropdown actor.
*
* Return true on success.
*/
function _apply(actor)
{
if (!actor.has_style_class_name || !actor.has_style_class_name('popup-menu-arrow'))
{
return false;
}
actor.hide();
if (dropdowns.indexOf(actor) < 0)
{
let connection = {
object: actor,
id: actor.connect('destroy', function()
{
let index;
index = signalConnections.indexOf(connection);
if (index >= 0)
{
signalConnections.splice(index, 1);
}
index = dropdowns.indexOf(actor);
if (index >= 0)
{
dropdowns.splice(index, 1);
}
})
};
signalConnections.push(connection);
dropdowns.push(actor);
}
return true;
}
/**
* Similar function to _recursiveApply(), but intended for containers.
*/
function _recursiveApplyInternal(actor, depth)
{
if (typeof actor.get_children === 'undefined')
{
return false;
}
let children = actor.get_children();
// If there are no children then it's possible that actor hasn't been fully initialized yet.
// Shedule to check later.
if (children.length == 0)
{
_scheduleApply(actor);
return false;
}
// Check actor immediate children before using recursion
for (let index = 0; index < children.length; index++)
{
if (_apply(children[index]))
{
return true;
}
}
// Check children recursively
if (depth < MAX_RECURSE_DEPTH)
{
for (let index = 0; index < children.length; index++)
{
if (_recursiveApplyInternal(children[index], depth + 1))
{
return true;
}
}
}
return false;
}
function _scheduleApply(actor)
{
let actorAddedId, destroyId, timeoutId;
actorAddedId = actor.connect('actor-added', function(child)
{
if (_recursiveApply(child))
{
actor.disconnect(actorAddedId);
actor.disconnect(destroyId);
Mainloop.source_remove(timeoutId);
actorAddedId = destroyId = timeoutId = 0;
}
});
destroyId = actor.connect('destroy', function()
{
if (timeoutId != 0) {
Mainloop.source_remove(timeoutId);
timeoutId = 0;
}
});
timeoutId = Mainloop.idle_add(function()
{
actor.disconnect(actorAddedId);
actor.disconnect(destroyId);
actorAddedId = destroyId = timeoutId = 0;
return GLib.SOURCE_REMOVE;
});
}
function _recursiveApply(actor)
{
return _apply(actor) || _recursiveApplyInternal(actor, 0);
}
function init()
{
// no initialization required
}
function enable()
{
Main.panel.actor.get_children().forEach(
function(actor)
{
signalConnections.push({
object: actor,
id: actor.connect('actor-added', _recursiveApply)
});
actor.get_children().forEach(_recursiveApply);
});
}
function disable()
{
while (signalConnections.length > 0)
{
let connection = signalConnections.pop();
connection.object.disconnect(connection.id);
}
while (dropdowns.length > 0)
{
let actor = dropdowns.pop();
actor.show();
}
}
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