You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: splitter.go
    path of file: ./repos/giu/examples/splitter
    
    the code of the file until where you have to start completion: package main

import (
	g "github.com/AllenDang/giu"
)

var (
	sashPos1 float32 = 200
	sashPos2 float32 = 200
	sashPos3 float32 = 200
	sashPos4 float32 = 100
)

func loop() {
	g.SingleWindow().Layout(
		g.SplitLayout(g.DirectionHorizontal
    
func loop() {
	g.SingleWindow().Layout(
		g.SplitLayout(g.DirectionHorizontal, &sashPos1,
			g.Layout{
				g.Label("Left panel"),
				g.Row(g.Button("Button1"), g.Button("Button2")),
			},
			g.SplitLayout(g.DirectionVertical, &sashPos2,
				g.Layout{},
				g.SplitLayout(g.DirectionHorizontal, &sashPos3,
					g.Layout{},
					g.SplitLayout(g.DirectionVertical, &sashPos4,
						g.Layout{},
						g.Layout{},
					),
				),
			),
		),
	)
}