07-border布局的另一个用处

实现如下的布局:

分析:

1.USERNAME和PASSWORD使用form

2.PASSWORD的文本框使用NewMultiLineEntry

布局1

USERNAME和PASSWORD作为一个form整体，使用border布局，form设置为top，文本框设置为center参数。

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("VPN")
	userEntry := widget.NewEntry()
	userL := widget.NewFormItem("USERNAME", userEntry)
	passEntry := widget.NewPasswordEntry()
	passL := widget.NewFormItem("PASSWORD", passEntry)
	form := widget.NewForm(userL, passL)
	txtArea := widget.NewMultiLineEntry()
	c := container.NewBorder(form, nil, nil, nil, txtArea)
	myWindow.SetContent(c)
	myWindow.Resize(fyne.NewSize(300, 300))
	myWindow.Show()
	myApp.Run()
}

布局2

使用vbox布局的效果:

代码如下:

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("VPN")
	userEntry := widget.NewEntry()
	userL := widget.NewFormItem("USERNAME", userEntry)
	passEntry := widget.NewPasswordEntry()
	passL := widget.NewFormItem("PASSWORD", passEntry)
	form := widget.NewForm(userL, passL)
	txtArea := widget.NewMultiLineEntry()
	//设置大小无效
	txtArea.Resize(fyne.NewSize(100, 100))
	c := container.NewVBox(form, txtArea)
	myWindow.SetContent(c)
	myWindow.Resize(fyne.NewSize(300, 300))
	myWindow.Show()
	myApp.Run()
}

当把txtArea放到容器里面，设置大小是不生效的。要想设置的大小生效，可以设置无布局。

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("VPN")
	userEntry := widget.NewEntry()
	userL := widget.NewFormItem("USERNAME", userEntry)
	passEntry := widget.NewPasswordEntry()
	passL := widget.NewFormItem("PASSWORD", passEntry)
	form := widget.NewForm(userL, passL)
	txtArea := widget.NewMultiLineEntry()
	txtArea.Resize(fyne.NewSize(290, 200))
	c1 := container.NewWithoutLayout(txtArea)
	c := container.NewVBox(form, c1)
	myWindow.SetContent(c)
	myWindow.Resize(fyne.NewSize(300, 300))
	myWindow.Show()
	myApp.Run()
}

效果如下: