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package ui
import (
"github.com/gdamore/tcell"
"github.com/mattn/go-runewidth"
)
type Tabs struct {
Tabs []*Tab
TabStrip *TabStrip
TabContent *TabContent
Selected int
onInvalidateStrip func(d Drawable)
onInvalidateContent func(d Drawable)
}
type Tab struct {
Content Drawable
Name string
invalid bool
}
type TabStrip Tabs
type TabContent Tabs
func NewTabs() *Tabs {
tabs := &Tabs{}
tabs.TabStrip = (*TabStrip)(tabs)
tabs.TabContent = (*TabContent)(tabs)
return tabs
}
func (tabs *Tabs) Add(content Drawable, name string) *Tab {
tab := &Tab{
Content: content,
Name: name,
}
tabs.Tabs = append(tabs.Tabs, tab)
tabs.TabStrip.Invalidate()
content.OnInvalidate(tabs.invalidateChild)
return tab
}
func (tabs *Tabs) invalidateChild(d Drawable) {
if tabs.Selected >= len(tabs.Tabs) {
return
}
if tabs.Tabs[tabs.Selected].Content == d {
if tabs.onInvalidateContent != nil {
tabs.onInvalidateContent(tabs.TabContent)
}
}
}
func (tabs *Tabs) Remove(content Drawable) {
for i, tab := range tabs.Tabs {
if tab.Content == content {
tabs.Tabs = append(tabs.Tabs[:i], tabs.Tabs[i+1:]...)
break
}
}
/* Force the selected index into the existing range */
if tabs.Selected >= len(tabs.Tabs) {
tabs.Select(tabs.Selected - 1)
}
tabs.TabStrip.Invalidate()
}
func (tabs *Tabs) Select(index int) {
if index >= len(tabs.Tabs) {
panic("Tried to set tab index to a non-existing element")
}
if tabs.Selected != index {
tabs.Selected = index
tabs.TabStrip.Invalidate()
tabs.TabContent.Invalidate()
}
}
// TODO: Color repository
func (strip *TabStrip) Draw(ctx *Context) {
x := 0
for i, tab := range strip.Tabs {
style := tcell.StyleDefault.Reverse(true)
if strip.Selected == i {
style = tcell.StyleDefault
}
trunc := runewidth.Truncate(tab.Name, 32, "…")
x += ctx.Printf(x, 0, style, " %s ", trunc)
}
style := tcell.StyleDefault.Reverse(true)
ctx.Fill(x, 0, ctx.Width()-x, 1, ' ', style)
}
func (strip *TabStrip) Invalidate() {
if strip.onInvalidateStrip != nil {
strip.onInvalidateStrip(strip)
}
}
func (strip *TabStrip) OnInvalidate(onInvalidate func(d Drawable)) {
strip.onInvalidateStrip = onInvalidate
}
func (content *TabContent) Children() []Drawable {
children := make([]Drawable, len(content.Tabs))
for i, tab := range content.Tabs {
children[i] = tab.Content
}
return children
}
func (content *TabContent) Draw(ctx *Context) {
if content.Selected >= len(content.Tabs) {
width := ctx.Width()
height := ctx.Height()
ctx.Fill(0, 0, width, height, ' ', tcell.StyleDefault)
}
tab := content.Tabs[content.Selected]
tab.Content.Draw(ctx)
}
func (content *TabContent) Invalidate() {
if content.onInvalidateContent != nil {
content.onInvalidateContent(content)
}
tab := content.Tabs[content.Selected]
tab.Content.Invalidate()
}
func (content *TabContent) OnInvalidate(onInvalidate func(d Drawable)) {
content.onInvalidateContent = onInvalidate
}