Implement freeform container

gfx/container.lua

@@ -0,0 +1,43 @@
+local Prop = require("gfx.prop")
+local Children = require("gfx.prop.children")
+local Element = require("gfx.element")
+
+local Container = Prop.attach(Element:new(), Children)
+
+function Container:draw()
+  local dirty = Element.draw(self)
+  if dirty then
+    self:_getWindow().clear()
+    for _,child in self:_iterateChildren() do
+      child:draw()
+    end
+  end
+  return dirty
+end
+
+function Container:_isDirty()
+  if Element._isDirty(self) then
+    return true
+  end
+
+  for _,child in self:_iterateChildren() do
+    if child:_isDirty() then
+      return true
+    end
+  end
+  return false
+end
+
+function Container:_reload()
+  Element._reload(self)
+
+  -- Reload child windows
+  local win = self:_getWindow()
+  for _,child in self:_iterateChildren() do
+    if child:_getWindow() ~= win then
+      child:setParent(win)
+    end
+  end
+end
+
+return Container