init layout, notifications, tabs & more

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

examples/layout/fullapp/second/second.go

@@ -0,0 +1,99 @@
+// Package second is the "Second" page's own workspace: deliberately a
+// different shape from first's (a single pane holding a themed list, not an
+// editor/terminal split), so swapping between the two via sidebar.Model's
+// "enter" case is visibly a real change of sub-app, not just a relabeled
+// copy of first. It also demonstrates notification.Show being called from
+// deep inside a nested layout.Model, with nothing wiring it to the
+// notification.Model that actually renders it - see main.go's model.View.
+package second
+
+import (
+	"charm.land/bubbles/v2/key"
+	bubbleslist "charm.land/bubbles/v2/list"
+	tea "charm.land/bubbletea/v2"
+
+	"github.com/anotherhadi/ilovetui/bubbles"
+	"github.com/anotherhadi/ilovetui/layout"
+	"github.com/anotherhadi/ilovetui/notification"
+)
+
+// kind is a list entry: a notification.Kind plus the title/message Show
+// gets called with when it's selected.
+type kind struct {
+	title   string
+	message string
+	kind    notification.Kind
+}
+
+func (k kind) Title() string       { return k.title }
+func (k kind) Description() string { return "" }
+func (k kind) FilterValue() string { return k.title }
+
+type pane struct {
+	list    bubbleslist.Model
+	w, h    int
+	focused bool
+}
+
+func newPane() *pane {
+	items := []bubbleslist.Item{
+		kind{title: "Info", message: "Just so you know.", kind: notification.Info},
+		kind{title: "Success", message: "Config written to disk.", kind: notification.Success},
+		kind{title: "Warning", message: "Disk space getting low on /dev/sda1.", kind: notification.Warning},
+		kind{title: "Error", message: "Failed to reach the remote host.", kind: notification.Error},
+	}
+	list := bubbles.NewList(items, 0, 0)
+	list.Title = "Notify"
+	// Same reasoning as sidebar.Model: the built-in help footer is
+	// redundant with layout's own centralized help bar (see HelpBindings
+	// below).
+	list.SetShowHelp(false)
+	return &pane{list: list}
+}
+
+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
+		p.list.SetSize(p.w-2, p.h-2)
+	case layout.FocusMsg:
+		p.focused = true
+	case layout.BlurMsg:
+		p.focused = false
+	}
+
+	if !p.focused {
+		return p, nil
+	}
+
+	if key, ok := msg.(tea.KeyPressMsg); ok && key.String() == "enter" {
+		if selected, ok := p.list.SelectedItem().(kind); ok {
+			return p, notification.Show(selected.title, selected.message, selected.kind)
+		}
+	}
+
+	var cmd tea.Cmd
+	p.list, cmd = p.list.Update(msg)
+	return p, cmd
+}
+
+func (p *pane) View() string {
+	return layout.Bordered(p.focused, p.w, p.h, p.list.View())
+}
+
+// HelpBindings implements layout.HelpProvider.
+func (p *pane) HelpBindings() []key.Binding {
+	return []key.Binding{
+		key.NewBinding(key.WithKeys("enter"), key.WithHelp("enter", "show notification")),
+		key.NewBinding(key.WithKeys("j"), key.WithHelp("j", "go down")),
+		key.NewBinding(key.WithKeys("k"), key.WithHelp("k", "go up")),
+	}
+}
+
+// NewWorkspace builds the "Second" page's own nested layout.Model. No
+// layout.AsRoot() - see first.NewWorkspace's doc comment.
+func NewWorkspace() layout.Model {
+	return layout.New(layout.Leaf("content", newPane()))
+}