First pass at notion of input element focus + example

examples/inputs/main.go

@@ -0,0 +1,130 @@
+package main
+
+import (
+	"fmt"
+	"os"
+
+	"github.com/charmbracelet/tea"
+	"github.com/charmbracelet/teaparty/input"
+)
+
+func main() {
+	tea.UseSysLog("tea")
+	if err := tea.NewProgram(
+		initialize,
+		update,
+		view,
+		subscriptions,
+	).Start(); err != nil {
+		fmt.Printf("could not start program: %s\n", err)
+		os.Exit(1)
+	}
+}
+
+type Model struct {
+	index      int
+	nameInput  input.Model
+	emailInput input.Model
+}
+
+func initialize() (tea.Model, tea.Cmd) {
+	n := input.DefaultModel()
+	n.Placeholder = "Name"
+	n.Focus = true
+
+	e := input.DefaultModel()
+	e.Placeholder = "Email"
+
+	return Model{0, n, e}, nil
+}
+
+func update(msg tea.Msg, model tea.Model) (tea.Model, tea.Cmd) {
+	m, ok := model.(Model)
+	if !ok {
+		panic("could not perform assertion on model")
+	}
+
+	switch msg := msg.(type) {
+
+	case tea.KeyMsg:
+		switch msg.String() {
+		case "ctrl+c":
+			return m, tea.Quit
+		case "tab":
+			fallthrough
+		case "shift+tab":
+
+			inputs := []input.Model{
+				m.nameInput,
+				m.emailInput,
+			}
+
+			if msg.String() == "tab" {
+				m.index++
+			} else {
+				m.index--
+			}
+			if m.index > len(inputs)-1 {
+				m.index = 0
+			} else if m.index < 0 {
+				m.index = len(inputs) - 1
+			}
+
+			for i := 0; i < len(inputs); i++ {
+				if i == m.index {
+					inputs[i].Focus = true
+					continue
+				}
+				inputs[i].Focus = false
+			}
+
+			m.nameInput = inputs[0]
+			m.emailInput = inputs[1]
+
+			return m, nil
+		default:
+			m.nameInput, _ = input.Update(msg, m.nameInput)
+			m.emailInput, _ = input.Update(msg, m.emailInput)
+			return m, nil
+		}
+
+	default:
+		m.nameInput, _ = input.Update(msg, m.nameInput)
+		m.emailInput, _ = input.Update(msg, m.emailInput)
+		return m, nil
+	}
+}
+
+func subscriptions(model tea.Model) tea.Subs {
+	return tea.Subs{
+		"blink": func(model tea.Model) tea.Msg {
+			m, _ := model.(Model)
+			return input.Blink(m.nameInput)
+		},
+	}
+}
+
+func view(model tea.Model) string {
+	m, ok := model.(Model)
+	if !ok {
+		return "[error] could not perform assertion on model"
+	}
+
+	s := "\n"
+
+	inputs := []string{
+		input.View(m.nameInput),
+		input.View(m.emailInput),
+	}
+
+	for i := 0; i < len(inputs); i++ {
+		s += inputs[i]
+		if i < len(inputs)-1 {
+			s += "\n"
+		}
+	}
+
+	s += "\n"
+
+	return s
+}