Notable API changes in Legion

[Simca]

Here's an example of how TradeSkill stuff changed from Live to Legion. This code was designed to execute an a passed function on every result for a tradeskill.

Before:

-- Clear the search box focus so the scan will have correct results.
local search_box = _G.TradeSkillFrameSearchBox
search_box:SetText("")

_G.TradeSkillSearch_OnTextChanged(search_box)
search_box:ClearFocus()
search_box:GetScript("OnEditFocusLost")(search_box)

table.wipe(header_list)

-- Save the current state of the TradeSkillFrame so it can be restored after we muck with it.
local have_materials = _G.TradeSkillFrame.filterTbl.hasMaterials
local have_skillup = _G.TradeSkillFrame.filterTbl.hasSkillUp

if have_materials then
    _G.TradeSkillFrame.filterTbl.hasMaterials = false
    _G.TradeSkillOnlyShowMakeable(false)
end

if have_skillup then
    _G.TradeSkillFrame.filterTbl.hasSkillUp = false
    _G.TradeSkillOnlyShowSkillUps(false)
end
_G.SetTradeSkillInvSlotFilter(0, true, true)
_G.TradeSkillUpdateFilterBar()
_G.TradeSkillFrame_Update()

-- Expand all headers so we can see all the recipes there are
for tradeskill_index = 1, _G.GetNumTradeSkills() do
    local name, tradeskill_type, _, is_expanded = _G.GetTradeSkillInfo(tradeskill_index)

    if tradeskill_type == "header" or tradeskill_type == "subheader" then
        if not is_expanded then
            header_list[name] = true
            _G.ExpandTradeSkillSubClass(tradeskill_index)
        end
    elseif iter_func(name, tradeskill_index) then
        break
    end
end

-- Restore the state of the things we changed.
for tradeskill_index = 1, _G.GetNumTradeSkills() do
    local name, tradeskill_type, _, is_expanded = _G.GetTradeSkillInfo(tradeskill_index)

    if header_list[name] then
        _G.CollapseTradeSkillSubClass(tradeskill_index)
    end
end
_G.TradeSkillFrame.filterTbl.hasMaterials = have_materials
_G.TradeSkillOnlyShowMakeable(have_materials)
_G.TradeSkillFrame.filterTbl.hasSkillUp = have_skillup
_G.TradeSkillOnlyShowSkillUps(have_skillup)

_G.TradeSkillUpdateFilterBar()
_G.TradeSkillFrame_Update()

After:

local recipes = _G.C_TradeSkillUI.GetAllRecipeIDs()

if recipes and (#recipes > 0) then
    for i = 1, #recipes do
        if iter_func(_G.C_TradeSkillUI.GetRecipeInfo(recipes[i]).name, recipes[i]) then
            break
        end
    end
end

If you had trouble working with filters with the old UI like I did, you will love these changes, since there are two main APIs - C_TradeSkillUI.GetAllRecipeIDs() and C_TradeSkillUI.GetFilteredRecipeIDs() (spelling?). The former ignores filters/searching while the latter respects them.