create unicode(chinese) support demo

demos/unicode/main.go

@@ -0,0 +1,49 @@
+// Demo code for unicode(chinese) support.
+package main
+
+import (
+	"fmt"
+
+	"github.com/rivo/tview"
+)
+
+func main() {
+	app := tview.NewApplication()
+	pages := tview.NewPages()
+
+	form := tview.NewForm()
+	form.AddDropDown("称谓", []string{"先生", "女士", "博士", "老师", "师傅"}, 0, nil).
+		AddInputField("姓名", "", 20, nil, nil).
+		AddCheckbox("年龄 18+", false, nil).
+		AddPasswordField("密码", "", 10, '*', nil).
+		AddButton("保存", func() {
+			_, title := form.GetElement(0).(*tview.DropDown).GetCurrentOption()
+			userName := form.GetElement(1).(*tview.InputField).GetText()
+
+			alert(pages, "alert-dialog", fmt.Sprintf("保存成功，%s %s！", userName, title))
+		}).
+		AddButton("退出", func() {
+			app.Stop()
+		})
+	form.SetBorder(true).SetTitle("输入一些内容").SetTitleAlign(tview.AlignLeft)
+	pages.AddPage("base", form, true, true)
+
+	if err := app.SetRoot(pages, true).SetFocus(pages).Run(); err != nil {
+		panic(err)
+	}
+}
+
+// alert show a message dialog
+func alert(pages *tview.Pages, id string, message string) *tview.Pages {
+	return pages.AddPage(
+		id,
+		tview.NewModal().
+			SetText(message).
+			AddButtons([]string{"确定"}).
+			SetDoneFunc(func(buttonIndex int, buttonLabel string) {
+				pages.HidePage(id).RemovePage(id)
+			}),
+		false,
+		true,
+	)
+}