DComboBox Painting

local PANEL = {}

function PANEL:Init()
    self:SetTextColor(color_white)
    self:SetSortItems(false)
end

function PANEL:Paint(intW, intH)
    surface.SetDrawColor(ADDON.Colors.Primary)
    surface.DrawRect(0, 0, intW, intH)

    surface.SetDrawColor(ADDON.Colors.Outline)
    surface.DrawOutlinedRect(0, 0, intW, intH)
end

function PANEL:DoClick()
    if self:IsMenuOpen() then
        return self:CloseMenu()
    end

    self:OpenMenu()

    for k, v in pairs(self.Menu:GetCanvas():GetChildren()) do
        v:SetTextColor(color_white)
        v:SetFont("ADDON:R15")
        function v:Paint(w, h)
            surface.SetDrawColor(ADDON.Colors.Outline)
            surface.DrawOutlinedRect(0, -1, w, h + 1)

            if self:IsHovered() then
                surface.SetDrawColor(ADDON.Colors.Blue)
                surface.DrawRect(1, 1, w - 2, h - 2)
            end
        end
    end

    function self.Menu:Paint(intW, intH)
        surface.SetDrawColor(ADDON.Colors.Primary)
        surface.DrawRect(0, 0, intW, intH)

        surface.SetDrawColor(ADDON.Colors.Outline)
        surface.DrawRect(0, 0, intW, 1)
    end
end

vgui.Register("ADDON:DComboBox", PANEL, "DComboBox")