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The Table widget is like the List widget (another of the toolkit’s collection widgets) with a two-dimensional index. Like List this is designed to help build really performant interfaces when lots of data is being presented. Because of this the widget is not created with all the data embedded, but instead calls out to the data source when needed.

The Table uses callback functions to ask for data when it is required. There are 3 main callbacks, Length, CreateCell and UpdateCell. The Length callback (passed first) is the simplest, it returns how many items are in the data to be presented, the two ints it returns represent the row and colum count. The other two relate to the content templates.

The CreateCell callback returns a new template object, just like list. The difference being that MinSize will define the standard size of each cell, and the minimum size of the table (it shows at least one cell). As previously the UpdateCell is called to apply data to a cell template. The index passed in is the same (row, col) int pair.

package main

import (
	"fyne.io/fyne/v2"
	"fyne.io/fyne/v2/app"
	"fyne.io/fyne/v2/widget"
)

var data = [][]string{[]string{"top left", "top right"},
	[]string{"bottom left", "bottom right"}}

func main() {
	myApp := app.New()
	myWindow := myApp.NewWindow("Table Widget")

	list := widget.NewTable(
		func() (int, int) {
			return len(data), len(data[0])
		},
		func() fyne.CanvasObject {
			return widget.NewLabel("wide content")
		},
		func(i widget.TableCellID, o fyne.CanvasObject) {
			o.(*widget.Label).SetText(data[i.Row][i.Col])
		})

	myWindow.SetContent(list)
	myWindow.ShowAndRun()
}