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background: properly disconnect background signals

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BackgroundManager connects to the changed signal in
the backgrounds it manages.

The signal ids for the changed signal connectionss are stored
as state on the background manager object.

If the background being managed changes while the manager
is still loading the old background, then the signal id
variable can get out of sync with the background object being
managed.

This commit ties the signal id to the background objects themselves,
so there is no opportunity for them to desynchronize.

https://bugzilla.gnome.org/show_bug.cgi?id=696157
This commit is contained in:
Ray Strode 2013-03-19 15:26:05 -04:00
parent b9da6d9ef6
commit f920fd8b6f
1 changed files with 18 additions and 17 deletions
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35
js/ui/background.js
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@ -654,17 +654,9 @@ const BackgroundManager = new Lang.Class({
this.background = this._createBackground();
this._newBackground = null;
this._loadedSignalId = 0;
this._changedSignalId = 0;
},
destroy: function() {
if (this._loadedSignalId)
this._newBackground.disconnect(this._loadedSignalId);
if (this._changedSignalId)
this.background.disconnect(this._changedSignalId);
if (this._newBackground) {
this._newBackground.actor.destroy();
this._newBackground = null;
@ -683,22 +675,24 @@ const BackgroundManager = new Lang.Class({
newBackground.saturation = background.saturation;
newBackground.visible = background.visible;
let signalId = newBackground.connect('loaded',
newBackground.loadedSignalId = newBackground.connect('loaded',
Lang.bind(this, function() {
newBackground.disconnect(signalId);
newBackground.disconnect(newBackground.loadedSignalId);
newBackground.loadedSignalId = 0;
Tweener.addTween(background.actor,
{ opacity: 0,
time: FADE_ANIMATION_TIME,
transition: 'easeOutQuad',
onComplete: Lang.bind(this, function() {
this.background = newBackground;
this._newBackground = null;
background.actor.destroy();
if (this.background == background) {
this.background = newBackground;
this._newBackground = null;
background.actor.destroy();
}
this.emit('changed');
})
});
}));
this._loadedSignalId = signalId;
this._newBackground = newBackground;
},
@ -717,12 +711,19 @@ const BackgroundManager = new Lang.Class({
background.actor.lower_bottom();
}
let signalId = background.connect('changed', Lang.bind(this, function() {
background.disconnect(signalId);
background.changeSignalId = background.connect('changed', Lang.bind(this, function() {
background.disconnect(background.changeSignalId);
background.changeSignalId = 0;
this._updateBackground(background, this._monitorIndex);
}));
this._changedSignalId = signalId;
background.actor.connect('destroy', Lang.bind(this, function() {
if (background.changeSignalId)
background.disconnect(background.changeSignalId);
if (background.loadedSignalId)
background.disconnect(background.loadedSignalId);
}));
return background;
},