动态更新 fyne 树小部件

问题描述

需要帮助在运行时更新 Tree 小部件，如此处所建议的 fyne issue 似乎在小部件上使用 Refresh() 函数它将同步存储在 list 地图中的数据更改，这里是代码：

package 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.Container
var tree *widget.Tree
var 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,)

    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"},}

    tree.Refresh()
}

谢谢

解决方法

vector v 是一个静态辅助函数，因此不会真正按照您想要的方式进行更新。如果您可以使用 NewTreeWithStrings，那么您可以指向您的数据结构，它会自动更新。

fyne go