init layout, notifications, tabs & more

Signed-off-by: Hadi <112569860+anotherhadi@users.noreply.github.com>

examples/layout/nested/main.go

@@ -0,0 +1,107 @@
+// Command nested demonstrates composability: "workspace" is itself a full
+// layout.Model (its own two-pane split) embedded as an ordinary Leaf inside
+// the outer tree. ctrl+hjkl bubbles in and out of it transparently, and
+// only the outer Model shows a help bar - the inner one is built without
+// layout.AsRoot(), see newWorkspace.
+package main
+
+import (
+	"fmt"
+	"os"
+
+	"charm.land/bubbles/v2/key"
+	tea "charm.land/bubbletea/v2"
+	"charm.land/lipgloss/v2"
+
+	"github.com/anotherhadi/ilovetui/layout"
+)
+
+type pane struct {
+	id      string
+	w, h    int
+	focused bool
+}
+
+func newPane(id string) *pane { return &pane{id: id} }
+
+func (p *pane) Init() tea.Cmd { return nil }
+
+func (p *pane) Update(msg tea.Msg) (layout.Pane, tea.Cmd) {
+	switch msg := msg.(type) {
+	case layout.SizeMsg:
+		p.w, p.h = msg.Width, msg.Height
+	case layout.FocusMsg:
+		p.focused = true
+	case layout.BlurMsg:
+		p.focused = false
+	}
+	return p, nil
+}
+
+func (p *pane) View() string {
+	content := lipgloss.NewStyle().
+		Width(p.w - 2).Height(p.h - 2).
+		AlignHorizontal(lipgloss.Center).AlignVertical(lipgloss.Center).
+		Render(p.id)
+	return layout.Bordered(p.focused, p.w, p.h, content)
+}
+
+// HelpBindings implements layout.HelpProvider, so every pane - at the top
+// level or nested three levels deep, doesn't matter - shows up correctly
+// in the single, outer help bar.
+func (p *pane) HelpBindings() []key.Binding {
+	return []key.Binding{key.NewBinding(key.WithKeys("enter"), key.WithHelp("enter", "use "+p.id))}
+}
+
+// newWorkspace builds the nested layout.Model: note the lack of
+// layout.AsRoot() here - only the outermost Model (see main) should render
+// a help bar, or focused help would show up twice.
+func newWorkspace() layout.Model {
+	root := layout.VSplit(0.7,
+		layout.Leaf("editor", newPane("editor")),
+		layout.Leaf("terminal", newPane("terminal")),
+	)
+	return layout.New(root)
+}
+
+// model is the actual top-level tea.Model: layout itself reserves no quit
+// key (that's an app policy, not layout's to make), so the host wraps it
+// and handles ctrl+c/q itself, same as any other custom component in this
+// repo (see examples/tabs).
+type model struct {
+	layout layout.Model
+}
+
+func (m model) Init() tea.Cmd { return m.layout.Init() }
+
+func (m model) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
+	if key, ok := msg.(tea.KeyPressMsg); ok {
+		switch key.String() {
+		case "ctrl+c", "q":
+			return m, tea.Quit
+		}
+	}
+
+	updated, cmd := m.layout.Update(msg)
+	m.layout = updated.(layout.Model)
+	return m, cmd
+}
+
+func (m model) View() tea.View {
+	view := tea.NewView(m.layout.View())
+	view.AltScreen = true
+	return view
+}
+
+func main() {
+	root := layout.HSplit(0.25,
+		layout.Leaf("sidebar", newPane("sidebar")).WithMinimum(20),
+		layout.Leaf("workspace", newWorkspace()),
+	)
+	m := model{layout: layout.New(root, layout.AsRoot())}
+
+	if _, err := tea.NewProgram(m).Run(); err != nil {
+		fmt.Println("Error running program:", err)
+		os.Exit(1)
+	}
+}