gnome-shell/js/ui/environment.js

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/* -*- mode: js2; js2-basic-offset: 4; indent-tabs-mode: nil -*- */
const Clutter = imports.gi.Clutter;;
const Shell = imports.gi.Shell;
const St = imports.gi.St;
const Gettext_gtk20 = imports.gettext.domain('gtk20');
const Tweener = imports.ui.tweener;
const Format = imports.misc.format;
// "monkey patch" in some varargs ClutterContainer methods; we need
// to do this per-container class since there is no representation
// of interfaces in Javascript
function _patchContainerClass(containerClass) {
// This one is a straightforward mapping of the C method
containerClass.prototype.child_set = function(actor, props) {
let meta = this.get_child_meta(actor);
for (prop in props)
meta[prop] = props[prop];
};
// clutter_container_add() actually is a an add-many-actors
// method. We conveniently, but somewhat dubiously, take the
// this opportunity to make it do something more useful.
containerClass.prototype.add = function(actor, props) {
this.add_actor(actor);
if (props)
this.child_set(actor, props);
};
}
// Replace @method with something that throws an error instead
function _blockMethod(method, replacement, reason) {
let match = method.match(/^(.+)\.([^.]+)$/);
if (!match)
throw new Error('Bad method name "' + method + '"');
let proto = 'imports.gi.' + match[1] + '.prototype';
let property = match[2];
if (!global.set_property_mutable(proto, property, true))
throw new Error('Bad method name "' + method + '"');
// eval() is evil in general, but we know it's safe here since
// set_property_mutable() would have failed if proto was
// malformed.
let node = eval(proto);
let msg = 'Do not use "' + method + '".';
if (replacement)
msg += ' Use "' + replacement + '" instead.';
if (reason)
msg += ' (' + reason + ')';
node[property] = function() {
throw new Error(msg);
};
global.set_property_mutable(proto, property, false);
}
function init() {
Tweener.init();
String.prototype.format = Format.format;
// Set the default direction for St widgets (this needs to be done before any use of St)
if (Gettext_gtk20.gettext('default:LTR') == 'default:RTL') {
St.Widget.set_default_direction(St.TextDirection.RTL);
}
_patchContainerClass(St.BoxLayout);
_patchContainerClass(St.Table);
Clutter.Actor.prototype.contains = function(child) {
while (child != null && child != this)
child = child.get_parent();
return child != null;
};
_blockMethod('Clutter.Event.get_state', 'Shell.get_event_state',
'gjs\'s handling of Clutter.ModifierType is broken. See bug 597292.');
_blockMethod('Gdk.Display.get_pointer', 'global.get_pointer',
'gjs\'s handling of Gdk.ModifierType is broken. See bug 597292.');
_blockMethod('Gdk.Window.get_pointer', 'global.get_pointer',
'gjs\'s handling of Gdk.ModifierType is broken. See bug 597292.');
// Now close the back door to prevent extensions from trying to
// abuse it. We can't actually delete it since
// Shell.Global.prototype itself is read-only.
global.set_property_mutable('imports.gi.Shell.Global.prototype', 'set_property_mutable', true);
Shell.Global.prototype.set_property_mutable = undefined;
}