allow colorrange as an attribute for Colorbar, which is consistent with plot types

src/makielayout/defaultattributes.jl

@@ -353,7 +353,9 @@ function default_attributes(::Type{Colorbar}, scene)
         "The colormap that the colorbar uses."
         colormap = lift_parent_attribute(scene, :colormap, :viridis)
         "The range of values depicted in the colorbar."
-        limits = (0f0, 1f0)
+        limits = nothing
+        "The range of values depicted in the colorbar."
+        colorrange = nothing
         "The align mode of the colorbar in its parent GridLayout."
         alignmode = Inside()
         "The number of steps in the heatmap underlying the colorbar gradient."
@@ -855,7 +857,7 @@ function attributenames(::Type{LegendEntry})
     (:label, :labelsize, :labelfont, :labelcolor, :labelhalign, :labelvalign,
         :patchsize, :patchstrokecolor, :patchstrokewidth, :patchcolor,
         :linepoints, :linewidth, :linecolor, :linestyle,
-        :markerpoints, :markersize, :markerstrokewidth, :markercolor, :markerstrokecolor, 
+        :markerpoints, :markersize, :markerstrokewidth, :markercolor, :markerstrokecolor,
         :polypoints, :polystrokewidth, :polycolor, :polystrokecolor)
 end
 

src/makielayout/layoutables/colorbar.jl

@@ -70,11 +70,26 @@ function layoutable(::Type{<:Colorbar}, fig_or_scene; bbox = nothing, kwargs...)
         ticklabelsvisible, ticks, tickformat, ticksize, ticksvisible, ticklabelpad, tickalign,
         tickwidth, tickcolor, spinewidth, topspinevisible,
         rightspinevisible, leftspinevisible, bottomspinevisible, topspinecolor,
-        leftspinecolor, rightspinecolor, bottomspinecolor, colormap, limits,
+        leftspinecolor, rightspinecolor, bottomspinecolor, colormap, limits, colorrange,
         halign, valign, vertical, flipaxis, ticklabelalign, flip_vertical_label,
         nsteps, highclip, lowclip,
         minorticksvisible, minortickalign, minorticksize, minortickwidth, minortickcolor, minorticks, scale)
 
+    limits = lift(limits, colorrange) do limits, colorrange
+        if isnothing(limits)
+            if isnothing(colorrange)
+                return (0, 1)
+            else
+                return colorrange
+            end
+        else
+            if !isnothing(colorrange)
+                error("Both colorrange + limits are set, please only set one, they're aliases. colorrange: $(colorrange), limits: $(limits)")
+            end
+            return limits
+        end
+    end
+
     decorations = Dict{Symbol, Any}()
 
     protrusions = Node(GridLayoutBase.RectSides{Float32}(0, 0, 0, 0))