For what it might be worth, here is the function my Any Source plugin uses to set the active sources, view filters, and selection. It works around a number of issues, some of which may have been specific to older versions of LR. You can ignore the lock() and unlock() -- they are there to provide mutual exclusion with another task that accesses global state (it's a myth that LR tasks are non-preemptive -- many SDK API calls can yield to other tasks).
--[[----------------------------------------------------------------------------
private state
setState (state)
Sets the active sources, filter, and selection to be "state" (see the
description of "queue" above), returning "state". We have to iterate
changing these, because they don't always "take" the first time around (a
general problem with many functions in the SDK).
------------------------------------------------------------------------------]]
function setState (state)
lock ()
local function setValues (label, set, compare)
local newState
local n, MaxIterations = 1, 100
while n <= MaxIterations do
set (state)
newState = getState ()
if compare (state, newState) then break end
LrTasks.sleep (0)
n = n + 1
end
if n > MaxIterations then
Debug.lognpp ("setState failed", state, newState)
end
end
setValues ("sources",
function (s) catalog:setActiveSources (s.sources) end,
function (s1, s2)
return deepEqual (s1.sources, s2.sources) end)
setValues ("filter",
function (s) catalog:setViewFilter (s.filter) end,
function (s1, s2) return deepEqual (s1.filter, s2.filter) end)
if state.selectedPhoto ~= nil then
setValues ("selectedPhotos",
function (s)
catalog:setSelectedPhotos (s.selectedPhoto, s.selectedPhotos)
end,
function (s1, s2)
return s1.selectedPhoto == s2.selectedPhoto and
deepEqual (s1.selectedPhotos, s2.selectedPhotos)
end)
end
--[[ Bug in LR 4 and 5 SDK -- can't clear the current
selection. catalog:setSelectedPhotos (nil, {}) results in
"assertion failed!". ]]
unlock ()
return state
end
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