how to make a frame draggable when its painted [ vgui derma ]

[benjiboi]

So, how would I go about making a frame draggable / a custom drag area on a frame that already painted?

[Geferon]

[url]https://github.com/garrynewman/garrysmod/blob/master/garrysmod/lua/vgui/dframe.lua#L136-L151[/url]
[url]https://github.com/garrynewman/garrysmod/blob/master/garrysmod/lua/vgui/dframe.lua#L200-L221[/url]