动态更新 fyne 树小部件

Question

需要帮助在运行时更新树小部件，正如这里所建议的fyne问题似乎在小部件上使用Refresh（）函数，它将同步存储在地图中的数据更改，这是代码：listpackage main//______________________________________________________________________________import (    "fyne.io/fyne/v2"    "fyne.io/fyne/v2/app"    "fyne.io/fyne/v2/container"    "fyne.io/fyne/v2/layout"    "fyne.io/fyne/v2/widget"    dbg "github.com/fatih/color")//______________________________________________________________________________var content *fyne.Containervar tree *widget.Treevar list map[string][]string//______________________________________________________________________________func main() {    myApp := app.New()    myWindow := myApp.NewWindow("List")    makeTree()    top := widget.NewLabel("Items' list::")    bottom := widget.NewButton("Update list", updateList)    content = container.New(layout.NewBorderLayout(top, bottom, nil, nil),        top,        tree,        bottom,    )    myWindow.SetContent(content)    myWindow.Resize(fyne.NewSize(480, 600))    myWindow.ShowAndRun()}//______________________________________________________________________________func makeTree() {    list = map[string][]string{        "":  {"A"},        "A": {"B", "D"},        "B": {"C"},        "C": {"abc"},        "D": {"E"},        "E": {"F", "G"},    }    tree = widget.NewTreeWithStrings(list)    tree.OnSelected = func(id string) {        dbg.Green("Tree node selected: %s", id)    }    tree.OnUnselected = func(id string) {        dbg.Green("Tree node unselected: %s", id)    }    tree.OpenAllBranches()}//______________________________________________________________________________func updateList() {    dbg.Green("UpdateList")    list = map[string][]string{        "":  {"A"},        "A": {"B"},        "B": {"C"},    }    tree.Refresh()}谢谢

Answer 1

这是一个静态帮助程序函数，因此不会真正按照您想要的方式进行更新。如果可以使用，则可以指向数据结构，它将自动更新。NewTreeWithStringsNewTree