Wiley-World.of.Warcraft.Programming.A.Guide.and.Reference.for.Creating.WoW.Addons

176 Part II ■ Programming in World of WarcraftThe pushed and highlight textures inherit the size and the placement of thenormal texture, because the game just changes the image file being displayed.You can see a new texture attribute that is used in the highlight texture, calledalphaMode. This attribute has five different options:DISABLE—Ignores the alpha channel completely when rendering thetexture.BLEND—Uses the alpha channel with a normal blending overlay.ALPHAKEY—Interprets the alpha with any black value being transparent,and any non-black value being opaque.ADD—Uses the alpha channel with an additive blending overlay.MOD—Ignores the alpha channel, multiplying the image against the background.The template uses the ADD alpha mode to achieve its particular highlighteffect.Creating New Frames with Your TemplateNow that you’ve defined the template, you need to actually create some framesusing it. Although you could do this in XML, you would need to create 24different frames and set anchors on each of them individually. Instead youwill do it using Lua, which is much shorter. Open BagBuddy.lua and add thefollowing inside the BagBuddy_OnLoad function:-- Create the item slotsself.items = {}for idx = 1, 24 dolocal item = CreateFrame(“Button“, “BagBuddy_Item“ .. idx, self, i“BagBuddyItemTemplate“)self.items[idx] = itemif idx == 1 thenitem:SetPoint(“TOPLEFT“, 40, -73)elseif idx == 7 or idx == 13 or idx == 19 then