init layout, notifications, tabs & more

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

examples/layout/messaging/main.go

@@ -0,0 +1,132 @@
+// Command messaging demonstrates the two ways panes talk without holding a
+// reference to each other: "control" sends arbitrary commands to "editor"
+// by id via SendMsg (1/2/3 keys), and asks layout to move focus there via
+// RequestFocusMsg (enter key) - the same pattern a real sidebar would use
+// to both drive and jump to a content pane it selected.
+package main
+
+import (
+	"fmt"
+	"os"
+
+	tea "charm.land/bubbletea/v2"
+	"charm.land/lipgloss/v2"
+
+	"github.com/anotherhadi/ilovetui/layout"
+)
+
+// commandMsg is what "control" sends to "editor" - an app-defined message,
+// entirely opaque to layout itself (see SendMsg).
+type commandMsg struct{ text string }
+
+type controlPane struct {
+	id      string // learned from SizeMsg.ID, needed as RequestFocusMsg.Source
+	w, h    int
+	focused bool
+}
+
+func (p *controlPane) Init() tea.Cmd { return nil }
+
+func (p *controlPane) Update(msg tea.Msg) (layout.Pane, tea.Cmd) {
+	switch msg := msg.(type) {
+	case layout.SizeMsg:
+		p.id, p.w, p.h = msg.ID, msg.Width, msg.Height
+	case layout.FocusMsg:
+		p.focused = true
+	case layout.BlurMsg:
+		p.focused = false
+	case tea.KeyPressMsg:
+		switch msg.String() {
+		case "1", "2", "3":
+			text := "command " + msg.String()
+			return p, func() tea.Msg {
+				return layout.SendMsg{Target: "editor", Msg: commandMsg{text: text}}
+			}
+		case "enter":
+			return p, func() tea.Msg {
+				return layout.RequestFocusMsg{Source: p.id, Target: "editor"}
+			}
+		}
+	}
+	return p, nil
+}
+
+func (p *controlPane) View() string {
+	content := "control\n\n1/2/3: send a command\nenter: focus editor"
+	inner := lipgloss.NewStyle().Width(p.w - 2).Height(p.h - 2).Render(content)
+	return layout.Bordered(p.focused, p.w, p.h, inner)
+}
+
+type editorPane struct {
+	w, h    int
+	focused bool
+	last    string
+}
+
+func (p *editorPane) Init() tea.Cmd { return nil }
+
+func (p *editorPane) 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
+	case commandMsg:
+		p.last = msg.text
+	}
+	return p, nil
+}
+
+func (p *editorPane) View() string {
+	last := p.last
+	if last == "" {
+		last = "(nothing yet)"
+	}
+	content := fmt.Sprintf("editor\n\nlast command received:\n%s", last)
+	inner := lipgloss.NewStyle().Width(p.w - 2).Height(p.h - 2).Render(content)
+	return layout.Bordered(p.focused, p.w, p.h, inner)
+}
+
+// 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(0.35,
+		layout.Leaf("control", &controlPane{}),
+		layout.Leaf("editor", &editorPane{}),
+	)
+	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)
+	}
+}