Tercio@23: --[[-----------------------------------------------------------------------------
Tercio@23: ScrollFrame Container
Tercio@23: Plain container that scrolls its content and doesn't grow in height.
Tercio@23: -------------------------------------------------------------------------------]]
Tercio@23: local Type, Version = "ScrollFrame", 23
Tercio@23: local AceGUI = LibStub and LibStub("AceGUI-3.0", true)
Tercio@23: if not AceGUI or (AceGUI:GetWidgetVersion(Type) or 0) >= Version then return end
Tercio@23: 
Tercio@23: -- Lua APIs
Tercio@23: local pairs, assert, type = pairs, assert, type
Tercio@23: local min, max, floor, abs = math.min, math.max, math.floor, math.abs
Tercio@23: 
Tercio@23: -- WoW APIs
Tercio@23: local CreateFrame, UIParent = CreateFrame, UIParent
Tercio@23: 
Tercio@23: --[[-----------------------------------------------------------------------------
Tercio@23: Support functions
Tercio@23: -------------------------------------------------------------------------------]]
Tercio@23: local function FixScrollOnUpdate(frame)
Tercio@23: 	frame:SetScript("OnUpdate", nil)
Tercio@23: 	frame.obj:FixScroll()
Tercio@23: end
Tercio@23: 
Tercio@23: --[[-----------------------------------------------------------------------------
Tercio@23: Scripts
Tercio@23: -------------------------------------------------------------------------------]]
Tercio@23: local function ScrollFrame_OnMouseWheel(frame, value)
Tercio@23: 	frame.obj:MoveScroll(value)
Tercio@23: end
Tercio@23: 
Tercio@23: local function ScrollFrame_OnSizeChanged(frame)
Tercio@23: 	frame:SetScript("OnUpdate", FixScrollOnUpdate)
Tercio@23: end
Tercio@23: 
Tercio@23: local function ScrollBar_OnScrollValueChanged(frame, value)
Tercio@23: 	frame.obj:SetScroll(value)
Tercio@23: end
Tercio@23: 
Tercio@23: --[[-----------------------------------------------------------------------------
Tercio@23: Methods
Tercio@23: -------------------------------------------------------------------------------]]
Tercio@23: local methods = {
Tercio@23: 	["OnAcquire"] = function(self) 
Tercio@23: 		self:SetScroll(0)
Tercio@23: 		self.scrollframe:SetScript("OnUpdate", FixScrollOnUpdate)
Tercio@23: 	end,
Tercio@23: 
Tercio@23: 	["OnRelease"] = function(self)
Tercio@23: 		self.status = nil
Tercio@23: 		for k in pairs(self.localstatus) do
Tercio@23: 			self.localstatus[k] = nil
Tercio@23: 		end
Tercio@23: 		self.scrollframe:SetPoint("BOTTOMRIGHT")
Tercio@23: 		self.scrollbar:Hide()
Tercio@23: 		self.scrollBarShown = nil
Tercio@23: 		self.content.height, self.content.width = nil, nil
Tercio@23: 	end,
Tercio@23: 
Tercio@23: 	["SetScroll"] = function(self, value)
Tercio@23: 		local status = self.status or self.localstatus
Tercio@23: 		local viewheight = self.scrollframe:GetHeight()
Tercio@23: 		local height = self.content:GetHeight()
Tercio@23: 		local offset
Tercio@23: 
Tercio@23: 		if viewheight > height then
Tercio@23: 			offset = 0
Tercio@23: 		else
Tercio@23: 			offset = floor((height - viewheight) / 1000.0 * value)
Tercio@23: 		end
Tercio@23: 		self.content:ClearAllPoints()
Tercio@23: 		self.content:SetPoint("TOPLEFT", 0, offset)
Tercio@23: 		self.content:SetPoint("TOPRIGHT", 0, offset)
Tercio@23: 		status.offset = offset
Tercio@23: 		status.scrollvalue = value
Tercio@23: 	end,
Tercio@23: 
Tercio@23: 	["MoveScroll"] = function(self, value)
Tercio@23: 		local status = self.status or self.localstatus
Tercio@23: 		local height, viewheight = self.scrollframe:GetHeight(), self.content:GetHeight()
Tercio@23: 		
Tercio@23: 		if self.scrollBarShown then
Tercio@23: 			local diff = height - viewheight
Tercio@23: 			local delta = 1
Tercio@23: 			if value < 0 then
Tercio@23: 				delta = -1
Tercio@23: 			end
Tercio@23: 			self.scrollbar:SetValue(min(max(status.scrollvalue + delta*(1000/(diff/45)),0), 1000))
Tercio@23: 		end
Tercio@23: 	end,
Tercio@23: 
Tercio@23: 	["FixScroll"] = function(self)
Tercio@23: 		if self.updateLock then return end
Tercio@23: 		self.updateLock = true
Tercio@23: 		local status = self.status or self.localstatus
Tercio@23: 		local height, viewheight = self.scrollframe:GetHeight(), self.content:GetHeight()
Tercio@23: 		local offset = status.offset or 0
Tercio@23: 		local curvalue = self.scrollbar:GetValue()
Tercio@23: 		-- Give us a margin of error of 2 pixels to stop some conditions that i would blame on floating point inaccuracys
Tercio@23: 		-- No-one is going to miss 2 pixels at the bottom of the frame, anyhow!
Tercio@23: 		if viewheight < height + 2 then
Tercio@23: 			if self.scrollBarShown then
Tercio@23: 				self.scrollBarShown = nil
Tercio@23: 				self.scrollbar:Hide()
Tercio@23: 				self.scrollbar:SetValue(0)
Tercio@23: 				self.scrollframe:SetPoint("BOTTOMRIGHT")
Tercio@23: 				self:DoLayout()
Tercio@23: 			end
Tercio@23: 		else
Tercio@23: 			if not self.scrollBarShown then
Tercio@23: 				self.scrollBarShown = true
Tercio@23: 				self.scrollbar:Show()
Tercio@23: 				self.scrollframe:SetPoint("BOTTOMRIGHT", -20, 0)
Tercio@23: 				self:DoLayout()
Tercio@23: 			end
Tercio@23: 			local value = (offset / (viewheight - height) * 1000)
Tercio@23: 			if value > 1000 then value = 1000 end
Tercio@23: 			self.scrollbar:SetValue(value)
Tercio@23: 			self:SetScroll(value)
Tercio@23: 			if value < 1000 then
Tercio@23: 				self.content:ClearAllPoints()
Tercio@23: 				self.content:SetPoint("TOPLEFT", 0, offset)
Tercio@23: 				self.content:SetPoint("TOPRIGHT", 0, offset)
Tercio@23: 				status.offset = offset
Tercio@23: 			end
Tercio@23: 		end
Tercio@23: 		self.updateLock = nil
Tercio@23: 	end,
Tercio@23: 
Tercio@23: 	["LayoutFinished"] = function(self, width, height)
Tercio@23: 		self.content:SetHeight(height or 0 + 20)
Tercio@23: 		self.scrollframe:SetScript("OnUpdate", FixScrollOnUpdate)
Tercio@23: 	end,
Tercio@23: 
Tercio@23: 	["SetStatusTable"] = function(self, status)
Tercio@23: 		assert(type(status) == "table")
Tercio@23: 		self.status = status
Tercio@23: 		if not status.scrollvalue then
Tercio@23: 			status.scrollvalue = 0
Tercio@23: 		end
Tercio@23: 	end,
Tercio@23: 
Tercio@23: 	["OnWidthSet"] = function(self, width)
Tercio@23: 		local content = self.content
Tercio@23: 		content.width = width
Tercio@23: 	end,
Tercio@23: 
Tercio@23: 	["OnHeightSet"] = function(self, height)
Tercio@23: 		local content = self.content
Tercio@23: 		content.height = height
Tercio@23: 	end
Tercio@23: }
Tercio@23: --[[-----------------------------------------------------------------------------
Tercio@23: Constructor
Tercio@23: -------------------------------------------------------------------------------]]
Tercio@23: local function Constructor()
Tercio@23: 	local frame = CreateFrame("Frame", nil, UIParent)
Tercio@23: 	local num = AceGUI:GetNextWidgetNum(Type)
Tercio@23: 
Tercio@23: 	local scrollframe = CreateFrame("ScrollFrame", nil, frame)
Tercio@23: 	scrollframe:SetPoint("TOPLEFT")
Tercio@23: 	scrollframe:SetPoint("BOTTOMRIGHT")
Tercio@23: 	scrollframe:EnableMouseWheel(true)
Tercio@23: 	scrollframe:SetScript("OnMouseWheel", ScrollFrame_OnMouseWheel)
Tercio@23: 	scrollframe:SetScript("OnSizeChanged", ScrollFrame_OnSizeChanged)
Tercio@23: 
Tercio@23: 	local scrollbar = CreateFrame("Slider", ("AceConfigDialogScrollFrame%dScrollBar"):format(num), scrollframe, "UIPanelScrollBarTemplate")
Tercio@23: 	scrollbar:SetPoint("TOPLEFT", scrollframe, "TOPRIGHT", 4, -16)
Tercio@23: 	scrollbar:SetPoint("BOTTOMLEFT", scrollframe, "BOTTOMRIGHT", 4, 16)
Tercio@23: 	scrollbar:SetMinMaxValues(0, 1000)
Tercio@23: 	scrollbar:SetValueStep(1)
Tercio@23: 	scrollbar:SetValue(0)
Tercio@23: 	scrollbar:SetWidth(16)
Tercio@23: 	scrollbar:Hide()
Tercio@23: 	-- set the script as the last step, so it doesn't fire yet
Tercio@23: 	scrollbar:SetScript("OnValueChanged", ScrollBar_OnScrollValueChanged)
Tercio@23: 
Tercio@23: 	local scrollbg = scrollbar:CreateTexture(nil, "BACKGROUND")
Tercio@23: 	scrollbg:SetAllPoints(scrollbar)
Tercio@23: 	scrollbg:SetTexture(0, 0, 0, 0.4)
Tercio@23: 
Tercio@23: 	--Container Support
Tercio@23: 	local content = CreateFrame("Frame", nil, scrollframe)
Tercio@23: 	content:SetPoint("TOPLEFT")
Tercio@23: 	content:SetPoint("TOPRIGHT")
Tercio@23: 	content:SetHeight(400)
Tercio@23: 	scrollframe:SetScrollChild(content)
Tercio@23: 
Tercio@23: 	local widget = {
Tercio@23: 		localstatus = { scrollvalue = 0 },
Tercio@23: 		scrollframe = scrollframe,
Tercio@23: 		scrollbar   = scrollbar,
Tercio@23: 		content     = content,
Tercio@23: 		frame       = frame,
Tercio@23: 		type        = Type
Tercio@23: 	}
Tercio@23: 	for method, func in pairs(methods) do
Tercio@23: 		widget[method] = func
Tercio@23: 	end
Tercio@23: 	scrollframe.obj, scrollbar.obj = widget, widget
Tercio@23: 
Tercio@23: 	return AceGUI:RegisterAsContainer(widget)
Tercio@23: end
Tercio@23: 
Tercio@23: AceGUI:RegisterWidgetType(Type, Constructor, Version)