| Venificus |
04-10-09 02:10 AM |
Another fix for List.lua
A small bug in the last list fix, this fixes it.
VFL\UI\FrameClasses\List.lua
Code:
-- List.lua
-- VFL
-- (C)2006 Bill Johnson
--
-- A List is a frame that contains a number of subframes and (possibly) a scrollbar.
VFLUI.List = {};
--- Create a new List.
-- @param cellHeight The height of each cell in the list.
-- @param fnAlloc The function called to allocate a new frame in the list.
function VFLUI.List:new(parent, cellHeight, fnAlloc)
local self = VFLUI.AcquireFrame("Frame");
if parent then
self:SetParent(parent); self:SetFrameStrata(parent:GetFrameStrata()); self:SetFrameLevel(parent:GetFrameLevel());
end
------- INTERNAL PARAMETERS
-- Dimensions
local nCells, dy = 0, 0;
-- Scrollbar
local scrollbar = VFLUI.VScrollBar:new(self);
local scrollEnabled = true;
-- Apply data function
local fnSize, fnData = VFL.EmptyLiterator();
local fnApplyData = VFL.Noop;
------- GRID CORE
local grid = VFLUI.Grid:new(self);
grid:SetPoint("TOPLEFT", self, "TOPLEFT"); grid:Show();
-- Anchor the scrollbar to the grid
scrollbar:ClearAllPoints();
scrollbar:SetPoint("TOPLEFT", grid, "TOPRIGHT", 0, -16);
scrollbar:SetPoint("BOTTOMRIGHT", grid, "BOTTOMRIGHT", 16, 16);
------- SCROLLING VIRTUALIZER
local virt = VFLUI.VirtualGrid:new(grid);
virt.GetVirtualSize = function()
local q = fnSize() - nCells + 1;
if(q < 1) then q = 1; end
return 1,q;
end
virt.OnRenderCell = function(v, c, x, y, vx, vy)
local pos = y + vy - 1;
local qq = fnData(pos);
if not qq then
c:Hide()
else
c:Show(); fnApplyData(c, qq, pos, y);
end
end
self.SetVerticalScroll = function(g, val)
local oldv, newv = virt.vy, math.floor(val);
if(oldv ~= newv) then virt:SetVirtualPosition(1, newv); end
end
------- SCROLLBAR HANDLER
local CreateScrollBar = function()
-- Don't create if we already have one
if scrollbar:IsShown() then return; end
-- Resize the grid to accomodate the new scrollbar
grid:SetCellDimensions(self:GetWidth() - 16, cellHeight);
scrollbar:Show();
end
local DestroyScrollBar = function()
if not scrollbar:IsShown() then return; end
grid:SetCellDimensions(self:GetWidth(), cellHeight);
scrollbar:Hide();
end
--- Enable/disable the scroll bar for this grid
function self:SetScrollBarEnabled(val)
if val then scrollEnabled = true; else scrollEnabled = nil; end
end
--- Get the underlying grid.
function self:_GetGrid() return grid; end
--- Rebuild the list control. This should be used when the size of the container frame changes.
function self:Rebuild()
local oldnCells = nCells;
nCells = math.floor(self:GetHeight() / cellHeight);
if(nCells < 0) then nCells = 0; end
if(oldnCells ~= nCells) then
grid:Clear();
grid:Size(1, nCells, fnAlloc);
grid:SetCellDimensions(self:GetWidth(), cellHeight);
self:Update();
else
grid:SetCellDimensions(self:GetWidth(), cellHeight);
end
end
--- Get the cell height provided at list creation.
function self:GetCellHeight() return cellHeight; end
--- Set the underlying data source for this list. The data source must be a _linear iterator_
-- which consists of a pair of functions; one to retrieve the size of the underlying list and
-- one which takes a numerical parameter and returns the data at that index, or NIL for none.
function self:SetDataSource(fnad, liSz, liData)
fnSize = liSz; fnData = liData; fnApplyData = fnad;
self:Update();
end
--- Set this list to empty.
function self:SetEmpty() self:SetDataSource(VFL.EmptyLiterator(), VFL.Noop); end
--- Update the list in response to an update of the data table.
function self:Update()
local _,dy = virt:GetVirtualSize();
-- Get the pagesize for the scroll bar
if(dy > 1) and nCells > 0 and scrollEnabled then
CreateScrollBar();
scrollbar:SetMinMaxValues(1, dy);
scrollbar:SetPageSize(nCells);
else
DestroyScrollBar();
end
virt:SetVirtualPosition(1, virt.vy);
if scrollbar:IsShown() then
scrollbar:SetValue(virt.vy); VFLUI.ScrollBarRangeCheck(scrollbar);
end
end
--- Change the scroll value of the list. If the second parameter is given, the scrollbar
-- will be pinned to the maximum value.
function self:SetScroll(n, max)
-- Update the virtual position of the list
if max then
virt:SetVirtualPosition(virt:GetVirtualSize());
else
virt:SetVirtualPosition(1, n);
end
-- Paint the scrollbar
if scrollbar:IsShown() then
scrollbar:SetValue(virt.vy);
VFLUI.ScrollBarRangeCheck(scrollbar);
end
end
-- Enable mousewheel scrolling
self:EnableMouseWheel(true)
self:SetScript("OnMouseWheel", function(thisframe, delta)
local newpos, _, maxpos = virt.vy - delta, virt:GetVirtualSize();
if(newpos < 1) then newpos = 1; elseif (newpos > maxpos) then newpos = maxpos; end
self:SetScroll(newpos);
end)
-- Auto-rebuild on size changed if necessary
self:SetScript("OnSizeChanged", self.Rebuild);
-- Destroy handler.
self.Destroy = VFL.hook(function(s)
s.SetVerticalScroll = nil;
scrollbar:Destroy(); scrollbar = nil;
virt:Destroy();
self.Rebuild = nil;
self.GetCellHeight = nil;
self.SetDataSource = nil;
self.SetEmpty = nil;
self.Update = nil;
self.SetScroll = nil; self.SetScrollBarEnabled = nil;
self._GetGrid = nil;
self:EnableMouseWheel(false);
self:SetScript("OnMouseWheel", nil);
end, self.Destroy);
return self;
end
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