114 lines
4.1 KiB
Lua
114 lines
4.1 KiB
Lua
return function(name, basalt)
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local base = basalt.getObject("Frame")(name, basalt)
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local objectType = "Flexbox"
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local flexDirection = "row" -- "row" or "column"
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local justifyContent = "flex-start" -- "flex-start", "flex-end", "center", "space-between", "space-around"
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local alignItems = "flex-start" -- "flex-start", "flex-end", "center", "space-between", "space-around"
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local spacing = 1
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local function getObjectOffAxisOffset(self, obj)
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local width, height = self:getSize()
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local objWidth, objHeight = obj.element:getSize()
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local availableSpace = flexDirection == "row" and height - objHeight or width - objWidth
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local offset = 1
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if alignItems == "center" then
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offset = 1 + availableSpace / 2
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elseif alignItems == "flex-end" then
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offset = 1 + availableSpace
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end
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return offset
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end
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local function applyLayout(self)
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local objects = self:getObjects()
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local totalElements = #objects
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local width, height = self:getSize()
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local mainAxisTotalChildSize = 0
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for _, obj in ipairs(objects) do
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local objWidth, objHeight = obj.element:getSize()
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if flexDirection == "row" then
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mainAxisTotalChildSize = mainAxisTotalChildSize + objWidth
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else
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mainAxisTotalChildSize = mainAxisTotalChildSize + objHeight
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end
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end
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local mainAxisAvailableSpace = (flexDirection == "row" and width or height) - mainAxisTotalChildSize - (spacing * (totalElements - 1))
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local justifyContentOffset = 1
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if justifyContent == "center" then
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justifyContentOffset = 1 + mainAxisAvailableSpace / 2
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elseif justifyContent == "flex-end" then
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justifyContentOffset = 1 + mainAxisvailableSpace
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end
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for _, obj in ipairs(objects) do
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local alignItemsOffset = getObjectOffAxisOffset(self, obj)
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if flexDirection == "row" then
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obj.element:setPosition(justifyContentOffset, alignItemsOffset)
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local objWidth, _ = obj.element:getSize()
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justifyContentOffset = justifyContentOffset + objWidth + spacing
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else
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obj.element:setPosition(alignItemsOffset, math.floor(justifyContentOffset+0.5))
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local _, objHeight = obj.element:getSize()
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justifyContentOffset = justifyContentOffset + objHeight + spacing
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end
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end
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end
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local object = {
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getType = function()
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return objectType
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end,
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isType = function(self, t)
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return objectType == t or base.getBase(self).isType(t) or false
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end,
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setSpacing = function(self, newSpacing)
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spacing = newSpacing
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applyLayout(self)
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return self
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end,
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getSpacing = function(self)
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return spacing
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end,
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setFlexDirection = function(self, direction)
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if direction == "row" or direction == "column" then
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flexDirection = direction
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applyLayout(self)
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end
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return self
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end,
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setJustifyContent = function(self, alignment)
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if alignment == "flex-start" or alignment == "flex-end" or alignment == "center" or alignment == "space-between" or alignment == "space-around" then
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justifyContent = alignment
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applyLayout(self)
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end
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return self
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end,
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setAlignItems = function(self, alignment)
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if alignment == "flex-start" or alignment == "flex-end" or alignment == "center" or alignment == "space-between" or alignment == "space-around" then
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alignItems = alignment
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applyLayout(self)
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end
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return self
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end,
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}
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for k,v in pairs(basalt.getObjects())do
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object["add"..k] = function(self, name)
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local obj = base["add"..k](self, name)
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applyLayout(base)
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return obj
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end
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end
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object.__index = object
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return setmetatable(object, base)
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end |