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|
package widgets
import (
"log"
"sync/atomic"
"github.com/gdamore/tcell"
"git.sr.ht/~sircmpwn/aerc/config"
"git.sr.ht/~sircmpwn/aerc/lib"
"git.sr.ht/~sircmpwn/aerc/lib/ui"
"git.sr.ht/~sircmpwn/aerc/worker/types"
)
type MessageList struct {
ui.Invalidatable
conf *config.AercConfig
logger *log.Logger
height int
scroll int
selected int
spinner *Spinner
store atomic.Value // *lib.MessageStore
}
func NewMessageList(conf *config.AercConfig, logger *log.Logger) *MessageList {
ml := &MessageList{
conf: conf,
logger: logger,
selected: 0,
spinner: NewSpinner(),
}
ml.store.Store((*lib.MessageStore)(nil))
ml.spinner.OnInvalidate(func(_ ui.Drawable) {
ml.Invalidate()
})
// TODO: stop spinner, probably
ml.spinner.Start()
return ml
}
func (ml *MessageList) Invalidate() {
ml.DoInvalidate(ml)
}
func (ml *MessageList) Draw(ctx *ui.Context) {
ml.height = ctx.Height()
ctx.Fill(0, 0, ctx.Width(), ctx.Height(), ' ', tcell.StyleDefault)
store := ml.Store()
if store == nil {
ml.spinner.Draw(ctx)
return
}
store.Lock()
var (
needsHeaders []uint32
row int = 0
)
for i := len(store.Uids) - 1 - ml.scroll; i >= 0; i-- {
uid := store.Uids[i]
msg := store.Messages[uid]
if row >= ctx.Height() {
break
}
if msg == nil {
needsHeaders = append(needsHeaders, uid)
ml.spinner.Draw(ctx.Subcontext(0, row, ctx.Width(), 1))
row += 1
continue
}
style := tcell.StyleDefault
if row == ml.selected-ml.scroll {
style = style.Reverse(true)
}
if _, ok := store.Deleted[msg.Uid]; ok {
style = style.Foreground(tcell.ColorGray)
}
ctx.Fill(0, row, ctx.Width(), 1, ' ', style)
ctx.Printf(0, row, style, "%s", msg.Envelope.Subject)
row += 1
}
if len(store.Uids) == 0 {
msg := ml.conf.Ui.EmptyMessage
ctx.Printf((ctx.Width()/2)-(len(msg)/2), 0,
tcell.StyleDefault, "%s", msg)
}
store.Unlock()
if len(needsHeaders) != 0 {
store.FetchHeaders(needsHeaders, nil)
ml.spinner.Start()
} else {
ml.spinner.Stop()
}
}
func (ml *MessageList) Height() int {
return ml.height
}
func (ml *MessageList) storeUpdate(store *lib.MessageStore) {
if ml.Store() != store {
return
}
store.Lock()
if len(store.Uids) > 0 {
for ml.selected >= len(store.Uids) {
ml.Prev()
}
}
store.Unlock()
ml.Invalidate()
}
func (ml *MessageList) SetStore(store *lib.MessageStore) {
if ml.Store() == store {
ml.scroll = 0
ml.selected = 0
}
ml.store.Store(store)
if store != nil {
ml.spinner.Stop()
store.OnUpdate(ml.storeUpdate)
} else {
ml.spinner.Start()
}
ml.Invalidate()
}
func (ml *MessageList) Store() *lib.MessageStore {
return ml.store.Load().(*lib.MessageStore)
}
func (ml *MessageList) Empty() bool {
store := ml.Store()
store.Lock()
defer store.Unlock()
return store == nil || len(store.Uids) == 0
}
func (ml *MessageList) Selected() *types.MessageInfo {
store := ml.Store()
store.Lock()
defer store.Unlock()
return store.Messages[store.Uids[len(store.Uids)-ml.selected-1]]
}
func (ml *MessageList) Select(index int) {
store := ml.Store()
store.Lock()
defer store.Unlock()
ml.selected = index
for ; ml.selected < 0; ml.selected = len(store.Uids) + ml.selected {
}
if ml.selected > len(store.Uids) {
ml.selected = len(store.Uids)
}
// I'm too lazy to do the math right now
for ml.selected-ml.scroll >= ml.Height() {
ml.scroll += 1
}
for ml.selected-ml.scroll < 0 {
ml.scroll -= 1
}
}
func (ml *MessageList) nextPrev(delta int) {
store := ml.Store()
store.Lock()
defer store.Unlock()
if store == nil || len(store.Uids) == 0 {
return
}
ml.selected += delta
if ml.selected < 0 {
ml.selected = 0
}
if ml.selected >= len(store.Uids) {
ml.selected = len(store.Uids) - 1
}
if ml.Height() != 0 {
if ml.selected-ml.scroll >= ml.Height() {
ml.scroll += 1
} else if ml.selected-ml.scroll < 0 {
ml.scroll -= 1
}
}
ml.Invalidate()
}
func (ml *MessageList) Next() {
ml.nextPrev(1)
}
func (ml *MessageList) Prev() {
ml.nextPrev(-1)
}
|
