D3vugu-components/components/input/list-binder.go
David Vogel 25f6c47602 Add dropdown component
- Add list binder interface
- Update input example page
2023-05-27 13:37:40 +02:00

50 lines
1.3 KiB
Go

package input
import "strconv"
// ListBinder describes the interface that anything that wants to present key value pairs needs to implement.
type ListBinder interface {
ListKeyValuePairs() []ListKeyValuePair
}
type ListKeyValuePair struct {
Key, Value string
}
// ListBindGenericSlice implements ListBinder for slices that are of some arbitrary type.
// For this to work, you need to supply a function that returns key value pairs for every slice entry.
type ListBindGenericSlice[T any] struct {
Slice *[]T
KeyValueFunc func(index int, entry T) ListKeyValuePair
}
func (l ListBindGenericSlice[T]) ListKeyValuePairs() []ListKeyValuePair {
if l.Slice == nil || l.KeyValueFunc == nil {
return nil
}
result := make([]ListKeyValuePair, 0, len(*l.Slice))
for i, entry := range *l.Slice {
result = append(result, l.KeyValueFunc(i, entry))
}
return result
}
// ListBindSlice implements ListBinder for string slices.
// The list index (as a string) is used as a key.
type ListBindSlice struct {
Slice *[]string
}
func (l ListBindSlice) ListKeyValuePairs() []ListKeyValuePair {
if l.Slice == nil {
return nil
}
result := make([]ListKeyValuePair, 0, len(*l.Slice))
for i, entry := range *l.Slice {
result = append(result, ListKeyValuePair{Key: strconv.Itoa(i), Value: entry})
}
return result
}