I'd like to better understand what causes bottom-to-top window
relationships, previous-to-next window relationships, and the restrictions
thereof.
Are the following statements true?
1. Every running app comprises one or more AppWindow instances.
2. A running app can open [currently only one?] child window via
"window.open()".
- (does this differ from privileged-to-certified-to-browser windows?)
3. A running app's AppWindows are part of a doubly-linked list,
apparently in LRU order:
- AppWindow.getBottomMostWindow() points to the least-recently-used
appwindow of this app.
- AppWindow.getTopMostWindow() points to the most-recently-used
appwindow of this app.
4. They are also doubly-linked in order of parent-child relationships,
if applicable:
- AppWindow.getPrev() returns the window that *created* this window, if
it was created with window.open().
- AppWindow.getNext() returns the *only-one-allowable* child window.
- The "root window" is the first in this doubly-linked list.
5. AppWindowManager and StackManager only track references to the
root AppWindow.
6. Independent browser windows each appear as separate "root" AppWindows.
Could someone point me to, or explain, a summary of the current
hierarchical model (and proposed/incoming changes to this model, if
applicable)?
I haven't been involved with system work until recently, but I know this
has been discussed before in relation to NGA; the only references I could
find to current/desired window management are in the dev-gaia "Multiple
Windows" discussion [1] and MDN's "Window Management"[2] doc which only
glosses over the hierarchy. The NGA proposal[3] doesn't really cover this
in depth. I've browsed through the System code but I'm not sure what's
intended vs. legacy.
Marcus
[1]
https://groups.google.com/d/topic/mozilla.dev.gaia/uvK0x3nL_Tw/discussion
[2]
https://developer.mozilla.org/en-US/docs/Mozilla/Firefox_OS/Platform/Gaia/Gaia_apps/Window_Management#Child_window_management
[3] https://wiki.mozilla.org/Gaia/Architecture_Proposal
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