update:scrollable list

internal/tui/scroll.go

@@ -0,0 +1,88 @@
+package tui
+
+// visibleRange returns [start, end) indices of rows that should be rendered.
+func visibleRange(total, selected, scrollOff, viewHeight int) (int, int) {
+	if total <= 0 {
+		return 0, 0
+	}
+
+	maxVis := viewHeight
+	if maxVis <= 0 {
+		maxVis = total // unconstrained
+	}
+	if maxVis >= total {
+		return 0, total
+	}
+
+	// Reserve lines for scroll indicators.
+	hasAbove := scrollOff > 0
+	hasBelow := scrollOff+maxVis < total
+	if hasAbove {
+		maxVis--
+	}
+	if hasBelow {
+		maxVis--
+	}
+	if maxVis < 1 {
+		maxVis = 1
+	}
+
+	start := scrollOff
+	end := start + maxVis
+
+	if selected < start {
+		start = selected
+		end = start + maxVis
+	}
+	if selected >= end {
+		end = selected + 1
+		start = end - maxVis
+	}
+	if start < 0 {
+		start = 0
+		end = min(maxVis, total)
+	}
+	if end > total {
+		end = total
+		start = max(0, end-maxVis)
+	}
+
+	return start, end
+}
+
+// syncScroll adjusts scrollOff so selected stays inside the viewport.
+func syncScroll(selected, total, viewHeight, scrollOff int) int {
+	if total <= 0 {
+		return 0
+	}
+	maxVis := viewHeight
+	if maxVis <= 0 || maxVis >= total {
+		return 0
+	}
+
+	if selected < 0 {
+		selected = 0
+	}
+	if selected >= total {
+		selected = total - 1
+	}
+
+	if scrollOff < 0 {
+		scrollOff = 0
+	}
+	if scrollOff > total-1 {
+		scrollOff = total - 1
+	}
+
+	if selected < scrollOff {
+		scrollOff = selected
+	}
+	if selected >= scrollOff+maxVis {
+		scrollOff = selected - maxVis + 1
+	}
+
+	if scrollOff < 0 {
+		scrollOff = 0
+	}
+	return scrollOff
+}

internal/tui/tui.go

@@ -46,6 +46,8 @@ type TUIInterface struct {
 	StorageErr     error
 	FileSelected   int  // cursor within StorageFiles
 	FileFocused    bool // true = ↑↓ drives file list, false = action menu
+	FileScrollOff  int  // first visible row in StorageFiles list
+	FileViewHeight int  // available visible rows for StorageFiles list
 	// file action page
 	ActiveFile    string
 	FileOpLoading bool
@@ -54,9 +56,9 @@ type TUIInterface struct {
 	// edit server page
 	EditingServer string // original name of server being edited
 	// clean all confirmation page
-	CleanInput    textinput.Model
+	CleanInput     textinput.Model
 	CleanOpLoading bool
-	CleanOpErr    error
+	CleanOpErr     error
 	// send / file picker page
 	Picker picker
 }
@@ -69,3 +71,32 @@ func NewTUIInterface(store *services.ServicesStore, localDir string) TUIInterfac
 		LocalDir:  localDir,
 	}
 }
+
+// fileListHeight calculates how many rows can fit in the server storage file list.
+func (m TUIInterface) fileListHeight() int {
+	h := m.WindowHeight
+	if h == 0 {
+		return 0 // unconstrained until first WindowSizeMsg
+	}
+
+	// Card chrome overhead (border top+bottom, inner padding top+bottom)
+	const cardOverhead = 6
+	// Header (title + subtitle + margins)
+	const headerLines = 4
+	// Footer (border + content)
+	const footerLines = 2
+	// Server actions menu rows (Send / Clean All)
+	actionLines := len(m.MenuItems)
+	if actionLines < 1 {
+		actionLines = 2
+	}
+	// File section chrome: section margin+border+padding + local-dir label+margin
+	const fileSectionOverhead = 5
+
+	used := cardOverhead + headerLines + footerLines + actionLines + fileSectionOverhead
+	available := h - used
+	if available < 1 {
+		available = 1
+	}
+	return available
+}

internal/tui/update.go

@@ -193,6 +193,8 @@ func (m TUIInterface) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
 		m.Selected = 0
 		m.FileSelected = 0
 		m.FileFocused = true
+		m.FileViewHeight = m.fileListHeight()
+		m.FileScrollOff = 0
 		m.StorageFiles = nil
 		m.StorageErr = nil
 		m.StorageLoading = true
@@ -303,6 +305,7 @@ func (m TUIInterface) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
 		m.StorageFiles = msg.files
 		m.StorageErr = msg.err
 		m.FileSelected = 0
+		m.FileScrollOff = syncScroll(m.FileSelected, len(m.StorageFiles), m.FileViewHeight, 0)
 		return m, nil
 
 	case configLoadedMsg:
@@ -332,6 +335,8 @@ func (m TUIInterface) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
 	case tea.WindowSizeMsg:
 		m.WindowWidth = msg.Width
 		m.WindowHeight = msg.Height
+		m.FileViewHeight = m.fileListHeight()
+		m.FileScrollOff = syncScroll(m.FileSelected, len(m.StorageFiles), m.FileViewHeight, m.FileScrollOff)
 		return m, nil
 
 	case tea.KeyPressMsg:
@@ -388,7 +393,7 @@ func (m TUIInterface) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
 				return m, func() tea.Msg { return pages.SelectEditServerPageMsg{} }
 			case "remove":
 				return m, func() tea.Msg { return pages.RemoveServerPageMsg{} }
-			// TODO: "edit"
+				// TODO: "edit"
 			}
 		case "ctrl+c":
 			m.Quitting = true
@@ -420,6 +425,9 @@ func (m TUIInterface) updateServerActions(msg tea.KeyPressMsg) (tea.Model, tea.C
 	case "tab":
 		if len(m.StorageFiles) > 0 || !m.StorageLoading {
 			m.FileFocused = !m.FileFocused
+			if m.FileFocused {
+				m.FileScrollOff = syncScroll(m.FileSelected, len(m.StorageFiles), m.FileViewHeight, m.FileScrollOff)
+			}
 		}
 
 	case "up", "k":
@@ -427,6 +435,7 @@ func (m TUIInterface) updateServerActions(msg tea.KeyPressMsg) (tea.Model, tea.C
 			if m.FileSelected > 0 {
 				m.FileSelected--
 			}
+			m.FileScrollOff = syncScroll(m.FileSelected, len(m.StorageFiles), m.FileViewHeight, m.FileScrollOff)
 		} else {
 			if m.Selected > 0 {
 				m.Selected--
@@ -438,6 +447,7 @@ func (m TUIInterface) updateServerActions(msg tea.KeyPressMsg) (tea.Model, tea.C
 			if m.FileSelected < len(m.StorageFiles)-1 {
 				m.FileSelected++
 			}
+			m.FileScrollOff = syncScroll(m.FileSelected, len(m.StorageFiles), m.FileViewHeight, m.FileScrollOff)
 		} else {
 			if m.Selected < len(m.MenuItems)-1 {
 				m.Selected++

internal/tui/view.go

@@ -220,6 +220,8 @@ func (m TUIInterface) viewServerActions() string {
 
 	// file list rows
 	var fileRows []string
+	showScrollUp := false
+	showScrollDown := false
 	switch {
 	case m.StorageLoading:
 		fileRows = append(fileRows, styles.StatusWarnStyle.Render("  loading…"))
@@ -228,12 +230,22 @@ func (m TUIInterface) viewServerActions() string {
 	case len(m.StorageFiles) == 0:
 		fileRows = append(fileRows, styles.StorageEmptyStyle.Render("  no files in storage"))
 	default:
-		for i, f := range m.StorageFiles {
+		start, end := visibleRange(len(m.StorageFiles), m.FileSelected, m.FileScrollOff, m.FileViewHeight)
+		showScrollUp = start > 0
+		showScrollDown = end < len(m.StorageFiles)
+		for i := start; i < end; i++ {
+			f := m.StorageFiles[i]
 			active := m.FileFocused && i == m.FileSelected
 			fileRows = append(fileRows, styles.FileItemStyle(active).Render(f))
 		}
 	}
 	fileList := lipgloss.JoinVertical(lipgloss.Left, fileRows...)
+	if showScrollUp {
+		fileList = styles.ScrollIndicatorStyle.Render("  ↑") + "\n" + fileList
+	}
+	if showScrollDown {
+		fileList = fileList + "\n" + styles.ScrollIndicatorStyle.Render("  ↓")
+	}
 	fileSection := styles.StorageFileSectionStyle.Render(
 		lipgloss.JoinVertical(lipgloss.Left, localDirLabel, fileList),
 	)