PANEL:PerformLayout
Description
Called whenever the panels' layout needs to be performed again. This means all child panels must be re-positioned to fit the possibly new size of this panel.
This can be triggered in numerous ways:
- Panel:InvalidateLayout was called this or previous frame (depending on the argument)
- A child element was added to this panel (TODO: Verify me)
- The size of this panel has changed
Do NOT call this function directly. Use Panel:InvalidateLayout instead!
Example
Creating a resizeable DFrame with a 'sidebar' that rescales along with the DFrame
local frame = vgui.Create("DFrame")
frame:SetSize(500, 400)
frame:Center()
frame:SetSizable(true)
-- oPerformLayout stores the original PerformLayout function
-- We store it because we are going to overwrite it with our own to scale the Sidebar
-- We then call the original function to maintain proper functionality of the frame
-- You can find the original PerformLayout here https://github.com/Facepunch/garrysmod/blob/master/garrysmod/lua/vgui/dframe.lua#L234-L258
local oPerformLayout = frame.PerformLayout
frame.PerformLayout = function(pnl, w, h)
oPerformLayout(pnl, w, h)
pnl.Sidebar:SetWide(w * 0.5)
end
frame.Sidebar = frame:Add("DPanel")
frame.Sidebar:Dock(LEFT)
frame.Sidebar.Paint = function(pnl, w, h)
surface.SetDrawColor(255, 0, 0)
surface.DrawRect(0, 0, w, h)
end
frame.Sidebar.PerformLayout = function(pnl, w, h)
local buttonWidth = w * 0.5
local buttonHeight = h * 0.5
pnl.Button:SetSize(buttonWidth, buttonHeight)
-- now we center our button
pnl.Button:SetPos(w / 2 - buttonWidth / 2, h / 2 - buttonHeight / 2)
end
frame.Sidebar.Button = frame.Sidebar:Add("DButton")
frame.Sidebar.Button:SetText("Hello!")
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