blob: 9c1674bf3b2e1093b3013127930a4bbb9d36573e (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
|
root = exports ? window
# TabRecency associates a logical timestamp with each tab id. These are used to provide an initial
# recency-based ordering in the tabs vomnibar (which allows jumping quickly between recently-visited tabs).
class TabRecency
timestamp: 1
current: -1
cache: {}
lastVisited: null
lastVisitedTime: null
timeDelta: 500 # Milliseconds.
constructor: ->
chrome.tabs.onActivated.addListener (activeInfo) => @register activeInfo.tabId
chrome.tabs.onRemoved.addListener (tabId) => @deregister tabId
chrome.tabs.onReplaced.addListener (addedTabId, removedTabId) =>
@deregister removedTabId
@register addedTabId
register: (tabId) ->
currentTime = new Date()
# Register tabId if it has been visited for at least @timeDelta ms. Tabs which are visited only for a
# very-short time (e.g. those passed through with `5J`) aren't registered as visited at all.
if @lastVisitedTime? and @timeDelta <= currentTime - @lastVisitedTime
@cache[@lastVisited] = ++@timestamp
@current = @lastVisited = tabId
@lastVisitedTime = currentTime
deregister: (tabId) ->
if tabId == @lastVisited
# Ensure we don't register this tab, since it's going away.
@lastVisited = @lastVisitedTime = null
delete @cache[tabId]
# Recently-visited tabs get a higher score (except the current tab, which gets a low score).
recencyScore: (tabId) ->
@cache[tabId] ||= 1
if tabId == @current then 0.0 else @cache[tabId] / @timestamp
BgUtils =
tabRecency: new TabRecency()
root.BgUtils = BgUtils
|
