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package layout
import (
tea "github.com/charmbracelet/bubbletea/v2"
"github.com/charmbracelet/lipgloss/v2"
"github.com/sst/opencode/internal/theme"
)
type FlexDirection int
const (
FlexDirectionHorizontal FlexDirection = iota
FlexDirectionVertical
)
type FlexChildSize struct {
Fixed bool
Size int
}
var FlexChildSizeGrow = FlexChildSize{Fixed: false}
func FlexChildSizeFixed(size int) FlexChildSize {
return FlexChildSize{Fixed: true, Size: size}
}
type FlexLayout interface {
tea.ViewModel
Sizeable
SetChildren(panes []tea.ViewModel) tea.Cmd
SetSizes(sizes []FlexChildSize) tea.Cmd
SetDirection(direction FlexDirection) tea.Cmd
}
type flexLayout struct {
width int
height int
direction FlexDirection
children []tea.ViewModel
sizes []FlexChildSize
}
type FlexLayoutOption func(*flexLayout)
func (f *flexLayout) View() string {
if len(f.children) == 0 {
return ""
}
t := theme.CurrentTheme()
views := make([]string, 0, len(f.children))
for i, child := range f.children {
if child == nil {
continue
}
alignment := lipgloss.Center
if alignable, ok := child.(Alignable); ok {
alignment = alignable.Alignment()
}
var childWidth, childHeight int
if f.direction == FlexDirectionHorizontal {
childWidth, childHeight = f.calculateChildSize(i)
view := lipgloss.PlaceHorizontal(
childWidth,
alignment,
child.View(),
// TODO: make configurable WithBackgroundStyle
lipgloss.WithWhitespaceStyle(lipgloss.NewStyle().Background(t.Background())),
)
views = append(views, view)
} else {
childWidth, childHeight = f.calculateChildSize(i)
view := lipgloss.Place(
f.width,
childHeight,
lipgloss.Center,
alignment,
child.View(),
// TODO: make configurable WithBackgroundStyle
lipgloss.WithWhitespaceStyle(lipgloss.NewStyle().Background(t.Background())),
)
views = append(views, view)
}
}
if f.direction == FlexDirectionHorizontal {
return lipgloss.JoinHorizontal(lipgloss.Center, views...)
}
return lipgloss.JoinVertical(lipgloss.Center, views...)
}
func (f *flexLayout) calculateChildSize(index int) (width, height int) {
if index >= len(f.children) {
return 0, 0
}
totalFixed := 0
flexCount := 0
for i, child := range f.children {
if child == nil {
continue
}
if i < len(f.sizes) && f.sizes[i].Fixed {
if f.direction == FlexDirectionHorizontal {
totalFixed += f.sizes[i].Size
} else {
totalFixed += f.sizes[i].Size
}
} else {
flexCount++
}
}
if f.direction == FlexDirectionHorizontal {
height = f.height
if index < len(f.sizes) && f.sizes[index].Fixed {
width = f.sizes[index].Size
} else if flexCount > 0 {
remainingSpace := f.width - totalFixed
width = remainingSpace / flexCount
}
} else {
width = f.width
if index < len(f.sizes) && f.sizes[index].Fixed {
height = f.sizes[index].Size
} else if flexCount > 0 {
remainingSpace := f.height - totalFixed
height = remainingSpace / flexCount
}
}
return width, height
}
func (f *flexLayout) SetSize(width, height int) tea.Cmd {
f.width = width
f.height = height
var cmds []tea.Cmd
currentX, currentY := 0, 0
for i, child := range f.children {
if child != nil {
paneWidth, paneHeight := f.calculateChildSize(i)
alignment := lipgloss.Center
if alignable, ok := child.(Alignable); ok {
alignment = alignable.Alignment()
}
// Calculate actual position based on alignment
actualX, actualY := currentX, currentY
if f.direction == FlexDirectionHorizontal {
// In horizontal layout, vertical alignment affects Y position
// (lipgloss.Center is used for vertical alignment in JoinHorizontal)
actualY = (f.height - paneHeight) / 2
} else {
// In vertical layout, horizontal alignment affects X position
contentWidth := paneWidth
if alignable, ok := child.(Alignable); ok {
if alignable.MaxWidth() > 0 && contentWidth > alignable.MaxWidth() {
contentWidth = alignable.MaxWidth()
}
}
switch alignment {
case lipgloss.Center:
actualX = (f.width - contentWidth) / 2
case lipgloss.Right:
actualX = f.width - contentWidth
case lipgloss.Left:
actualX = 0
}
}
// Set position if the pane is Alignable
if c, ok := child.(Alignable); ok {
c.SetPosition(actualX, actualY)
}
if sizeable, ok := child.(Sizeable); ok {
cmd := sizeable.SetSize(paneWidth, paneHeight)
cmds = append(cmds, cmd)
}
// Update position for next pane
if f.direction == FlexDirectionHorizontal {
currentX += paneWidth
} else {
currentY += paneHeight
}
}
}
return tea.Batch(cmds...)
}
func (f *flexLayout) GetSize() (int, int) {
return f.width, f.height
}
func (f *flexLayout) SetChildren(children []tea.ViewModel) tea.Cmd {
f.children = children
if f.width > 0 && f.height > 0 {
return f.SetSize(f.width, f.height)
}
return nil
}
func (f *flexLayout) SetSizes(sizes []FlexChildSize) tea.Cmd {
f.sizes = sizes
if f.width > 0 && f.height > 0 {
return f.SetSize(f.width, f.height)
}
return nil
}
func (f *flexLayout) SetDirection(direction FlexDirection) tea.Cmd {
f.direction = direction
if f.width > 0 && f.height > 0 {
return f.SetSize(f.width, f.height)
}
return nil
}
func NewFlexLayout(children []tea.ViewModel, options ...FlexLayoutOption) FlexLayout {
layout := &flexLayout{
children: children,
direction: FlexDirectionHorizontal,
sizes: []FlexChildSize{},
}
for _, option := range options {
option(layout)
}
return layout
}
func WithDirection(direction FlexDirection) FlexLayoutOption {
return func(f *flexLayout) {
f.direction = direction
}
}
func WithChildren(children ...tea.ViewModel) FlexLayoutOption {
return func(f *flexLayout) {
f.children = children
}
}
func WithSizes(sizes ...FlexChildSize) FlexLayoutOption {
return func(f *flexLayout) {
f.sizes = sizes
}
}
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