andlabs-ui/redo/proposals/tree.md

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# Tree
Unlike Table, Tree can only store a set of a single data type. (Blame Windows.)
```go
type TreeData struct {
Checked bool
Image ImageIndex
Text string
Children []TreeData // TODO does this need to be *[]TreeData?
}
```
(the facilities for Images has yet to be designed)
Tree itself will operate similarly to Table:
```go
type Tree struct {
Control
sync.Locker // with Unlock() refreshing the view
Data() *[]TreeData
SetHasCheckboxes(bool)
SetHasImages(bool)
}
```
By default, a Tree only shows the Text field.
A Tree path is just an `[]int` with each element set to the consecutive index in Children. For example:
```go
i := []int{3, 4, 5}
value := tree.Data()[i[0]].Children[i[1]].Children[i[2]].Text
```