如何使用fyne设置焦点？

package main

import (
    "fyne.io/fyne/v2"
    "fyne.io/fyne/v2/app"
    "fyne.io/fyne/v2/container"
    "fyne.io/fyne/v2/widget"
)

func main() {
    myApp := app.New()
    myWindow := myApp.NewWindow("Focus Example")

    input1 := widget.NewEntry()
    input2 := widget.NewEntry()

    input1.SetOnFocusGained(func() {
        // 在焦点获得时执行的操作
    })

    input1.SetOnFocusLost(func() {
        // 在焦点失去时执行的操作
    })

    button := widget.NewButton("Set Focus", func() {
        // 设置焦点到input2
        fyne.CurrentApp().SetFocus(input2)
    })

    content := container.NewVBox(
        input1,
        input2,
        button,
    )

    myWindow.SetContent(content)
    myWindow.ShowAndRun()
}