Fyne error: Attempt to access current Fyne app when none is started

Question

I've been trying to figure out what is causing this error... Might just be me, but maybe you can see what i can't. Hopefully you can give me a helping hand.

Whenever I run my code it gives this error

Fyne error: Attempt to access current Fyne app when none is started

go/pkg/mod/fyne.io/fyne/[email protected]/app.go:92

Any idea? Here is the code. and It runs*

// GoMark project main.go
// Version 1.3
package main

import (
    "fmt"
    "image/color"
    "log"
    "os"
    "runtime"

    "fyne.io/fyne/v2"
    "fyne.io/fyne/v2/app"
    "fyne.io/fyne/v2/canvas"
    "fyne.io/fyne/v2/container"
    "fyne.io/fyne/v2/dialog"
    "fyne.io/fyne/v2/theme"
    "fyne.io/fyne/v2/widget"
)

var text = widget.NewMultiLineEntry() //Text entry
var textTitle = widget.NewLabel("")
var preview = widget.NewRichTextFromMarkdown("") //Preview side
var myWindow fyne.Window
var down_dir = ""
var filePath = "" // THIS WILL NOT EDIT PRESET!!! Look further down...
var savename = ""
var savenametxt = ""
var myApp = app.New()

func main() {
    myWindow = myApp.NewWindow("GoMark 1.3")
    // - - - Text editor / Preview - - -

    textTitle.SetText("UNSAVED DOCUMENT")
    left := container.NewBorder(nil, nil, nil, nil, text)
    middle := container.NewHSplit(left, preview)
    text.OnChanged = func(string) { //When someting is written or canged in the text entry, update with this function
        preview.ParseMarkdown(text.Text)
    }
    // - - - END - - -

    // - - - TOP SECTION - - -
    //Line creation
    line := canvas.NewLine(color.Black)
    line.StrokeWidth = 4
    savename := widget.NewEntry()
    savename.SetPlaceHolder("ABC123")

    //- - - Settings toolbar - - -
    settings := widget.NewToolbar(
        widget.NewToolbarAction(theme.ContentClearIcon(), func() {
            dialog.ShowConfirm("Do you want to clear document?", "", callback, myWindow)
        }),
        widget.NewToolbarSeparator(),
        widget.NewToolbarAction(theme.FolderNewIcon(), func() {
            log.Println("Save as Doc")
            dialog.ShowFileSave(DownloadDirectory, myWindow)
        }),
        widget.NewToolbarAction(theme.DocumentSaveIcon(), func() {
            log.Println("Save Doc")

            form_savename := widget.NewFormItem("", savename)
            form := dialog.NewForm("Save Name to S:", "Save", "Cancel", []*widget.FormItem{form_savename}, func(b bool) {
                if b == true {
                    fmt.Println("Save selected")
                    savenametxt = savename.Text
                    SaveToS(myWindow)
                    savename.SetText(savenametxt)
                }
            }, myWindow)
            form.Resize(fyne.NewSize(400, 200))
            form.Show()
        }),
    )

    //Combiner
    top := container.NewBorder(nil, line, nil, settings, textTitle)
    // - - - END - - -

    //Run the main fyne window
    main := container.NewBorder(top, nil, nil, nil, middle)
    myWindow.Resize(fyne.NewSize(1200, 800))
    myWindow.SetContent(main)
    myWindow.ShowAndRun()
}

//Clear text confirmation
func callback(yes bool) {
    fmt.Println("Running Callback")
    if yes == true {
        fmt.Println("Text CLEAR")
        clean()
    } else {
        fmt.Println("Text STAY")
    }
}

//Clear text box and preview
func clean() {
    text.Text = ""
    preview.ParseMarkdown(text.Text)
    text.Refresh()
    textTitle.Text = "UNSAVED DOCUMENT"
    textTitle.Refresh()
    dialog.ShowInformation("Text has been cleared", "", myWindow)
}

//Choose a Download folder
func DownloadDirectory(savedir fyne.URIWriteCloser, err error) {
    fmt.Println("Dialog")
    fmt.Println(savedir.URI())
}

//- - - Save to S: - - -
func SaveToS(myWindow fyne.Window) {
    if runtime.GOOS == "Windows" {
        filePath = "S:\\TMP\\DocMove" //EDIT DIR PRESET FOR WINDOWS
        filePath = filePath + "\\"
    } else {
        filePath = "/mnt/s/TMP/DocMove" // EDIT DIR PRESET FOR LINUX
        filePath = filePath + "/"
    }
    fmt.Println(runtime.GOOS)
    file, errC := os.Create(filePath + savenametxt + ".md")
    if errC != nil {
        dialog.ShowError(errC, myWindow)
        fmt.Println(errC)
        return
    } else {
        _, errWriting := file.Write([]byte(text.Text))
        if errWriting != nil {
            dialog.ShowError(errWriting, myWindow)
            fmt.Println(errWriting)
            return
        } else {
            textTitle.SetText(savenametxt)
            dialog.ShowInformation("Sucess", savenametxt+" Has been saved", myWindow)
            fmt.Println(filePath + savenametxt + ".md")
        }
    }
}

Answer 1

You are trying to create widgets before the fyne app is initiated.

This order gave me no errors:

var down_dir = ""
var filePath = "" // THIS WILL NOT EDIT PRESET!!! Look further down...
var savename = ""
var savenametxt = ""
var myApp = app.New()
var text = widget.NewMultiLineEntry() //Text entry
var textTitle = widget.NewLabel("")
var preview = widget.NewRichTextFromMarkdown("") //Preview side
var myWindow fyne.Window