How to make a table with different object types in fyne-io?

Question

I use fyne-io to make an user interface. In a table, I want some cells with hyperlink and others with Label .

I try it but it doesn't work :

package main

import (
    "fmt"

    "fyne.io/fyne"
    "fyne.io/fyne/app"
    "fyne.io/fyne/layout"
    "fyne.io/fyne/widget"
)

func setDefaultColumnsWidth(table *widget.Table) {
    table.SetColumnWidth(0, 130)
    table.SetColumnWidth(1, 150)
    table.SetColumnWidth(2, 160)
    table.SetColumnWidth(3, 200)
    table.SetColumnWidth(4, 400)
    table.SetColumnWidth(5, 150)
    table.SetColumnWidth(6, 250)
    table.SetColumnWidth(7, 110)
    table.SetColumnWidth(8, 80)
}

func main() {

    application := app.New()
    win := application.NewWindow("Test GUI")

    data := [][]string{{"ffffffffffffff", "ffffffffffffff", "ffffffffffffff", "ffffffffffffff", "ffffffffffffff", "ffffffffffffff", "ffffffffffffff"},
        {"ffffffffffffff", "ffffffffffffff", "ffffffffffffff", "ffffffffffffff", "ffffffffffffff", "ffffffffffffff", "ffffffffffffff"},
        {"ffffffffffffff", "ffffffffffffff", "ffffffffffffff", "ffffffffffffff", "ffffffffffffff", "ffffffffffffff", "ffffffffffffff"}}


    tableData := widget.NewTable(
        func() (int, int) {
            return len(data), len(data[0])
        },
        func() fyne.CanvasObject {
            label := widget.NewLabel("")
            return label
        },
        func(i widget.TableCellID, o fyne.CanvasObject) {
            switch o.(type) {
            case *widget.Label:
                label := o.(*widget.Label)
                label.SetText(data[i.Row][i.Col])

            case *widget.Hyperlink:
                fmt.Println("Found Hyperlink")
                hyperlink := o.(*widget.Hyperlink)


                //  hyperlink.SetText(data[i.Row][i.Col])
                hyperlink.SetText("aaaaaaa")
            }

        })
    setDefaultColumnsWidth(tableData)
    id := widget.TableCellID{Row: 1, Col: 1}
    hyperlink := widget.NewHyperlink("TUTU", nil)
    obj := fyne.CanvasObject(hyperlink)
    fmt.Println("UpdateCell...")
    tableData.UpdateCell(id, obj)

    label := widget.NewLabel("My table :")
    button := widget.NewButton("Close", func() {
        application.Quit()
    })

    container := layout.NewBorderLayout(label, button, nil, nil)
    box := fyne.NewContainerWithLayout(container, label, tableData, button)
    win.SetContent(box)

    win.Resize(fyne.NewSize(1800, 400))
    win.ShowAndRun()
}

How can I do ?

I see message of "fmt.Println("Found Hyperlink")" but hyperlink isn't displayed.

Why o.(type) equals to *widget.Hyperlink and hyperlink isn't displayed ?

Answer 1

I contacted the Fyne Slack group and a recommended solution is to encapsulate both elements in a container and display only the desired element at the update callback function

Create cell callback function :

func() fyne.CanvasObject {
    label := widget.NewLabelWithStyle("", fyne.TextAlignLeading, fyne.TextStyle{})
    hyperlink := widget.NewHyperlink("", nil)
    hyperlink.Hide()
    return container.NewMax(label, hyperlink)
}

Updade callback function :

func(i widget.TableCellID, o fyne.CanvasObject) {

    container := o.(*fyne.Container)
    label := container.Objects[0].(*widget.Label)
    hyperlink := container.Objects[1].(*widget.Hyperlink)

    switch i.Col {
    case 0:
    case 5:
        label.Hide()
        hyperlink.Hidden = false
        hyperlink.SetText("Hi!")
        hyperlink.SetURL(url.Parse("https://stackoverflow.com"))

    default:
        hyperlink.Hide()
        label.Hidden = false
        label.SetText("Hello")
    }
}