[GH-ISSUE #315] list.SetChangedFunc is not called after list.SetCurrentItem #239

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opened 2026-03-04 01:03:14 +03:00 by kerem · 1 comment

kerem commented

2026-03-04 01:03:14 +03:00

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Originally created by @SamWhited on GitHub (Jun 25, 2019).
Original GitHub issue: https://github.com/rivo/tview/issues/315

The documentation for List.SetChangedFunc say:

This function is also called when the first item is added or when SetCurrentItem() is called.

However, this does not appear to be working. For example, if we modify the lists example to output selected items then call List.SetCurrentItem, nothing happens except that the list item is selected:

package main

import (
	"fmt"
	"time"

	"github.com/rivo/tview"
)

func main() {
	app := tview.NewApplication()
	list := tview.NewList().
		AddItem("List item 1", "Some explanatory text", 'a', nil).
		AddItem("List item 2", "Some explanatory text", 'b', nil).
		AddItem("List item 3", "Some explanatory text", 'c', nil).
		AddItem("List item 4", "Some explanatory text", 'd', nil).
		AddItem("Quit", "Press to exit", 'q', func() {
			app.Stop()
		})
	list.SetChangedFunc(func(index int, mainText string, secondaryText string, shortcut rune) {
		list.AddItem(fmt.Sprintf("Item %d selected", index), "", 0, nil)
	})
	go func() {
		time.Sleep(time.Second)

		list.SetCurrentItem(2)
		app.Draw()
	}()
	if err := app.SetRoot(list, true).Run(); err != nil {
		panic(err)
	}
}

Originally created by @SamWhited on GitHub (Jun 25, 2019). Original GitHub issue: https://github.com/rivo/tview/issues/315 The documentation for [`List.SetChangedFunc`](https://godoc.org/github.com/rivo/tview#List.SetChangedFunc) say: > This function is also called when the first item is added or when SetCurrentItem() is called. However, this does not appear to be working. For example, if we modify the lists example to output selected items then call [`List.SetCurrentItem`](https://godoc.org/github.com/rivo/tview#List.SetCurrentItem), nothing happens except that the list item is selected: ```go package main import ( "fmt" "time" "github.com/rivo/tview" ) func main() { app := tview.NewApplication() list := tview.NewList(). AddItem("List item 1", "Some explanatory text", 'a', nil). AddItem("List item 2", "Some explanatory text", 'b', nil). AddItem("List item 3", "Some explanatory text", 'c', nil). AddItem("List item 4", "Some explanatory text", 'd', nil). AddItem("Quit", "Press to exit", 'q', func() { app.Stop() }) list.SetChangedFunc(func(index int, mainText string, secondaryText string, shortcut rune) { list.AddItem(fmt.Sprintf("Item %d selected", index), "", 0, nil) }) go func() { time.Sleep(time.Second) list.SetCurrentItem(2) app.Draw() }() if err := app.SetRoot(list, true).Run(); err != nil { panic(err) } } ```

kerem closed this issue

2026-03-04 01:03:14 +03:00

kerem commented

2026-03-04 01:03:15 +03:00

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@rivo commented on GitHub (Jul 11, 2019):

Thanks. (I ended up not using your PR because I haven't set up unit test cases yet. Still on my todo list.)

@rivo commented on GitHub (Jul 11, 2019): Thanks. (I ended up not using your PR because I haven't set up unit test cases yet. Still on my todo list.)