| AsyncTabSwitcher.sys.mjs |
The tab switcher is responsible for asynchronously switching
tabs in e10s. It waits until the new tab is ready (i.e., the
layer tree is available) before switching to it. Then it
unloads the layer tree for the old tab.
The tab switcher is a state machine. For each tab, it
maintains state about whether the layer tree for the tab is
available, being loaded, being unloaded, or unavailable. It
also keeps track of the tab currently being displayed, the tab
it's trying to load, and the tab the user has asked to switch
to. The switcher object is created upon tab switch. It is
released when there are no pending tabs to load or unload.
The following general principles have guided the design:
1. We only request one layer tree at a time. If the user
switches to a different tab while waiting, we don't request
the new layer tree until the old tab has loaded or timed out.
2. If loading the layers for a tab times out, we show the
spinner and possibly request the layer tree for another tab if
the user has requested one.
3. We discard layer trees on a delay. This way, if the user is
switching among the same tabs frequently, we don't continually
load the same tabs.
It's important that we always show either the spinner or a tab
whose layers are available. Otherwise the compositor will draw
an entirely black frame, which is very jarring. To ensure this
never happens when switching away from a tab, we assume the
old tab might still be drawn until a MozAfterPaint event
occurs. Because layout and compositing happen asynchronously,
we don't have any other way of knowing when the switch
actually takes place. Therefore, we don't unload the old tab
until the next MozAfterPaint event.
|
46613 |
| content |
|
|
| jar.mn |
|
922 |
| metrics.yaml |
|
2784 |
| moz.build |
|
639 |
| NewTabPagePreloading.sys.mjs |
This module is in charge of preloading 'new tab' pages for use when
the user opens a new tab.
|
6294 |
| OpenInTabsUtils.sys.mjs |
Utility functions that can be used when opening multiple tabs, that can be
called without any tabbrowser instance.
|
2331 |
| TabsList.sys.mjs |
Populate the popup with menuitems and setup the listeners.
|
14932 |
| TabUnloader.sys.mjs |
-*- mode: js; indent-tabs-mode: nil; js-indent-level: 2 -*- |
16436 |
| test |
|
|
| triage.json |
|
3788 |