Derma opening 10 times instead of just once

[auri45]

I'm using this code to open a derma panel on the player's screen when they press E on an npc:

hook.Add( "PlayerUse", "dermat", function( ply, ent )
    if ( ent:GetClass() == "prof" ) then
        RunConsoleCommand("dermapop")
    end
end )

concommand.Add("dermapop", function()
local tFrame = vgui.Create( "DFrame" )
tFrame:SetPos( ScrW()/2 + 50,ScrH()/2 + 50  )
tFrame:SetSize( 300, 150 )
tFrame:SetTitle( "Name window" )
tFrame:SetVisible( true )
tFrame:SetDraggable( false )
tFrame:ShowCloseButton( true )
tFrame:MakePopup()
end)

I intended for it to open only 1 window, but it opens multiple in the same spot making the player have to spam the close button to get rid of all of them. How do I make it only create 1 window?

[auri45]

Thanks! I put this into the command:

 

concommand.Add("dermapop", function()
if IsValid(tFrame) then print("the window exists") end

if not IsValid(tFrame) then 
tFrame = vgui.Create( "DFrame" )
tFrame:SetPos( ScrW()/2 + 50,ScrH()/2 + 50  )
tFrame:SetSize( 700, 350 )
tFrame:SetTitle( "Professor" )
tFrame:SetVisible( true )
tFrame:SetDraggable( false )
tFrame:ShowCloseButton( true )
tFrame:MakePopup()

end
end)

[Jompe...]

You can also add [URL="https://wiki.garrysmod.com/page/Entity/SetUseType"]self:SetUseType(SIMPLE_USE)[/URL] in the ENT:Initialize function of your entity.

function ENT:Initialize()
    self:SetUseType(SIMPLE_USE)
end

[andreblue]

[QUOTE=Jompe...;51816674]You can also add [URL="https://wiki.garrysmod.com/page/Entity/SetUseType"]self:SetUseType(SIMPLE_USE)[/URL] in the ENT:Initialize function of your entity.

function ENT:Initialize()
    self:SetUseType(SIMPLE_USE)
end

[/QUOTE]

Thats for SENTS, what the user is doing is on a hook, but it would be simpler if only that prop needs it.