Resize RichText elements using data biding + List Data

[montovaneli]

I wanted to resize RichText elements in a *widget.List when using data biding + List Data. However, the SetItemHeight function requires the id, meaning we can only use it in NewList. Am I correct or is there any way to do this?

Something like:

func() fyne.CanvasObject {
return widget.NewRichText()
},
func(i binding.DataItem, o fyne.CanvasObject) {
  itemText, _ := i.(binding.String).Get()
  o.(*widget.RichText).Segments = widget.NewRichTextFromMarkdown(itemText).Segments
  r.MessageWidgetList.SetItemHeight(o, o.(*widget.RichText).MinSize().Height) // This line fails because SetItemHeight requires list ID

})

[BillBuilt]

I needed that too, so I ended up creating a custom widget that would expose the ListItemID as well.

type List struct {
	widget.List
}

func NewList(length func() int, createItem func() fyne.CanvasObject, updateItem func(widget.ListItemID, fyne.CanvasObject)) *List {
	list := &List{
		List: widget.List{Length: length, CreateItem: createItem, UpdateItem: updateItem},
	}

	list.ExtendBaseWidget(list)
	return list

}

// NewListWithDataWithID creates a new list widget that will display the contents of the provided data but also passes the ListItemID to the updateItem func.
func NewListWithDataWithID(data binding.DataList, createItem func() fyne.CanvasObject, updateItem func(widget.ListItemID, binding.DataItem, fyne.CanvasObject)) *List {
	l := NewList(
		data.Length,
		createItem,
		func(i widget.ListItemID, o fyne.CanvasObject) {
			item, err := data.GetItem(i)
			if err != nil {
				fyne.LogError(fmt.Sprintf("Error getting data item %d", i), err)
				return
			}
			updateItem(i, item, o)
		})

	data.AddListener(binding.NewDataListener(l.Refresh))
	return l
}

[andydotxyz]

You don't need anything custom - you can just use NewList and read your data source in the standard callbacks.
As it happens I showed how on a video earlier today. https://youtu.be/CO3dlYbtmOI