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Add extra_css_classes Gtk.Widget attribute #3

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Merged
merged 1 commit into from
Sep 8, 2025
Merged

Add extra_css_classes Gtk.Widget attribute #3

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16 changes: 16 additions & 0 deletions LuaGObject/override/Gtk4.lua
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Original file line number Diff line number Diff line change
Expand Up @@ -27,6 +27,7 @@ Gtk.Widget._attribute = {
width = { get = Gtk.Widget.get_allocated_width },
height = { get = Gtk.Widget.get_allocated_height },
children = {},
extra_css_classes = {},
}

-- Allow to query a widget's currently-allocated dimensions by indexing .width or .height, and set the requested dimensions by assigning these pseudo-properties.
Expand Down Expand Up @@ -70,6 +71,21 @@ function Gtk.Widget._attribute.children:get()
return setmetatable({ _widget = self }, widget_children_mt)
end

function Gtk.Widget._attribute.extra_css_classes:get()
error("%s: Cannot read extra_css_classes; attribute is read-only.", self._type.name)
end
function Gtk.Widget._attribute.extra_css_classes:set(value)
if type(value) == "string" then
value = { value }
end
if type(value) ~= "table" then
error("%s: Cannot assign value of type %s to extra_css_classes", self._type.name, type(value))
end
for _, c in pairs(value) do
self:add_css_class(c)
end
end

-- Simple container support --

Gtk.Box._container_add = Gtk.Box._method.append
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11 changes: 11 additions & 0 deletions tests/gtk.lua
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Expand Up @@ -134,3 +134,14 @@ function gtk.notebook_container()
check(notebook:get_nth_page(1) == label2)
check(notebook:get_nth_page(2) == label3)
end

function gtk.extra_css_classes()
local Gtk = LuaGObject.Gtk
local box = Gtk.Box {
orientation = "VERTICAL",
extra_css_classes = { "linked" },
}
check(box:has_css_class "linked")
-- The .vertical CSS class comes from setting the orientation to vertical. By checking it here, the test ensures that the existing class isn't overwritten by extra_css_classes.
check(box:has_css_class "vertical")
end
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