Add grid wrap to demo app to show it off

cmd/fyne_demo/tutorials/collection.go

@@ -21,6 +21,44 @@ func collectionScreen(_ fyne.Window) fyne.CanvasObject {
 	return container.NewCenter(content)
 }
 
+func makeGridWrapTab(_ fyne.Window) fyne.CanvasObject {
+	data := make([]string, 1000)
+	for i := range data {
+		data[i] = "Test Item " + strconv.Itoa(i)
+	}
+
+	icon := widget.NewIcon(nil)
+	label := widget.NewLabel("Select An Item From The List")
+	vbox := container.NewVBox(icon, label)
+
+	grid := widget.NewGridWrap(
+		func() int {
+			return len(data)
+		},
+		func() fyne.CanvasObject {
+			text := widget.NewLabel("Template Object")
+			text.Alignment = fyne.TextAlignCenter
+			return container.NewVBox(container.NewPadded(widget.NewIcon(theme.DocumentIcon())), text)
+		},
+		func(id widget.ListItemID, item fyne.CanvasObject) {
+			item.(*fyne.Container).Objects[1].(*widget.Label).SetText(data[id])
+		},
+	)
+	grid.OnSelected = func(id widget.ListItemID) {
+		label.SetText(data[id])
+		icon.SetResource(theme.DocumentIcon())
+	}
+	grid.OnUnselected = func(id widget.ListItemID) {
+		label.SetText("Select An Item From The List")
+		icon.SetResource(nil)
+	}
+	grid.Select(15)
+
+	split := container.NewHSplit(grid, container.NewCenter(vbox))
+	split.Offset = 0.6
+	return split
+}
+
 func makeListTab(_ fyne.Window) fyne.CanvasObject {
 	data := make([]string, 1000)
 	for i := range data {

cmd/fyne_demo/tutorials/data.go

@@ -150,6 +150,11 @@ var (
 			makeTreeTab,
 			true,
 		},
+		"gridwrap": {"GridWrap",
+			"A grid based arrangement of cached elements that wraps rows to fit.",
+			makeGridWrapTab,
+			true,
+		},
 		"dialogs": {"Dialogs",
 			"Work with dialogs.",
 			dialogScreen,
@@ -175,7 +180,7 @@ var (
 	// TutorialIndex  defines how our tutorials should be laid out in the index tree
 	TutorialIndex = map[string][]string{
 		"":            {"welcome", "canvas", "animations", "icons", "widgets", "collections", "containers", "dialogs", "windows", "binding", "advanced"},
-		"collections": {"list", "table", "tree"},
+		"collections": {"list", "table", "tree", "gridwrap"},
 		"containers":  {"apptabs", "border", "box", "center", "doctabs", "grid", "scroll", "split"},
 		"widgets":     {"accordion", "button", "card", "entry", "form", "input", "progress", "text", "toolbar"},
 	}