Grid view

ui.GridView shows items in a grid, as Photos' library and Finder's icon view: as many columns as fit items at least as wide as asked, sharing the width left, in rows of a height, built only as they show, so grids of millions of items are as fast as small ones. Gap spaces the items.

app.photos.Selected = &app.photo
ui.GridView(c, &app.photos, len(photos), 140, 120, func(i int) {
	ui.Image(c, thumbs[i]).Fit(ui.Contain).Grow(1)
	ui.Text(c, photos[i].Name).SingleLine()
}).Grow(1)

Grid state

A GridState keeps the grid's place and says how items are chosen, as a ListState does rows, or nil:

• Selected lets a click choose an item, as the arrows do in both directions while the grid has the keyboard focus, with Home, End, and Enter (Submitted).
• Selection lets the user choose several, by Key: Cmd-click adds an item or takes it out, Shift-click and Shift with the arrows choose those from the item last chosen, and Cmd+A chooses all.
• Label returns an item's text: typing its first letters chooses it, and assistive technology reads it as the item's name.
• Reorder lets the user drag items to another place, as a list's rows: see drag and drop.

Accessibility

Assistive technology reads the grid as a list of items, each saying which of all it is, built or not.