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https://github.com/Ukendio/jecs.git
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123 lines
3 KiB
Text
123 lines
3 KiB
Text
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local UserInputService = game:GetService("UserInputService")
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local vide = require(script.Parent.Parent.Parent.Parent.vide)
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local create = vide.create
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local source = vide.source
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local cleanup = vide.cleanup
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local effect = vide.effect
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local action = vide.action
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local changed = vide.changed
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local untrack = vide.untrack
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local read = vide.read
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type can<T> = T | () -> T
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type snap_area = {
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zindex: can<number>?,
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snapped: (boolean) -> ()
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}
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type snappable = {
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--- tells the object that you are dragging it
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dragging: () -> boolean,
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--- allows making the widget float by itself without being anchored to anything
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allow_floating: can<boolean>,
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--- callbacks that update the position and size
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snapped: (boolean) -> (),
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position: (UDim2) -> (),
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size: (UDim2) -> ()
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}
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local function in_bounds(mpos: Vector2, pos: Vector2, size: Vector2)
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return mpos.X >= pos.X and mpos.X <= pos.X + size.X and mpos.Y >= pos.Y and mpos.Y <= pos.Y + size.Y
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end
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return function()
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local snap_areas = {}
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local mouse_position = source(Vector2.zero)
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local function snap_area(props: snap_area)
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local position = source(Vector2.zero)
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local size = source(Vector2.zero)
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local docked = source(false)
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return create "Frame" {
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Name = "SnapArea",
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AutoLocalize = false,
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Size = UDim2.fromScale(1, 1),
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BackgroundTransparency = 1,
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changed("AbsoluteSize", size),
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changed("AbsolutePosition", position),
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action(function(ref)
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snap_areas[ref] = {
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position = position,
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docked = docked,
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size = size,
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zindex = props.zindex or 0
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}
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cleanup(function()
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snap_areas[ref] = nil
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end)
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end)
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}
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end
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local function snappable(props: snappable)
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local snapped_to = source()
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effect(function()
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if props.dragging() == false then return end
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local mpos = mouse_position()
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untrack(function()
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if snapped_to() then snapped_to().docked(false) end
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local snap_to
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for _, data in snap_areas do
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if not in_bounds(mpos, data.position(), data.size()) then continue end
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if snap_to and read(data.zindex) <= read(snap_to.zindex) then continue end
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snap_to = data
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end
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if not snap_to and read(props.allow_floating) == false then return end
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if snap_to and snap_to.docked() then return end
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if snap_to then snap_to.docked(true) end
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snapped_to(snap_to)
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end)
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end)
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effect(function()
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props.snapped(if snapped_to() then true else false)
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end)
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effect(function()
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if not snapped_to() then return end
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local data = snapped_to()
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local pos = data.position()
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local size = data.size()
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props.position(UDim2.fromOffset(pos.X, pos.Y))
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props.size(UDim2.fromOffset(size.X, size.Y))
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end)
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end
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cleanup(UserInputService.InputChanged:Connect(function(input)
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if input.UserInputType ~= Enum.UserInputType.MouseMovement then return end
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mouse_position(Vector2.new(input.Position.X, input.Position.Y))
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end))
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return {
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snap_area = snap_area,
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snappable = snappable
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}
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end
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