109 lines
3.2 KiB
Go
109 lines
3.2 KiB
Go
package mujica
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import (
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"log/slog"
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"time"
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"github.com/egoist/mygo/ui"
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"mujicaui/theme"
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)
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// MessageListState keeps a MessageList's place and what the user has seen.
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type MessageListState struct {
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list ui.ListState
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seen int
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started bool
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}
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// ScrollToEnd shows the newest message and follows new ones again.
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func (s *MessageListState) ScrollToEnd() { s.list.ScrollToEnd() }
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// AtEnd reports whether the newest message is in view.
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func (s *MessageListState) AtEnd() bool { return s.list.AtEnd() }
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// MessageListOptions configure a MessageList.
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type MessageListOptions struct {
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// ID returns message i's stable identity; required.
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ID func(i int) string
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// Date returns message i's time; set, a separator heads each new day.
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Date func(i int) time.Time
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// Label returns message i's text for assistive technology and typing to find.
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Label func(i int) string
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}
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// MessageListResult is a MessageList's element and its unread count.
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type MessageListResult struct {
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Element *ui.Element
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unread int
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}
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// Unread returns how many messages arrived since the user scrolled away from the end.
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func (r MessageListResult) Unread() int { return r.unread }
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// MessageList shows n messages, building only those in view, and follows the end until the user scrolls up.
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func MessageList(c *ui.Context, s *MessageListState, n int, opts MessageListOptions, row func(i int)) MessageListResult {
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if opts.ID == nil || row == nil {
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panic("mujica: MessageList needs ID and row")
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}
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if n < 0 {
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panic("mujica: MessageList with negative message count")
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}
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u := Density(c).Unit()
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s.list.Key = func(i int) any { return opts.ID(i) }
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s.list.Label = opts.Label
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s.list.FollowEnd = true
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at := !s.started || s.list.AtEnd()
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if at || n < s.seen {
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s.seen = n
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}
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s.started = true
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r := MessageListResult{unread: n - s.seen}
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r.Element = ui.Box(c).Grow(1).MinHeight(0)
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r.Element.Children(func() {
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ui.List(c, &s.list, n, func(i int) {
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ui.Column(c).Padding(u*2, u*4).Gap(u * 2).Children(func() {
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if opts.Date != nil && (i == 0 || !messageListSameDay(opts.Date(i-1), opts.Date(i))) {
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messageListDay(c, opts.Date(i))
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}
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row(i)
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})
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}).Fill().Justify(ui.End).Label(msg(c, "message_list.label"))
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jump := ScrollToBottomButton(c, !at, r.unread)
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if jump.Clicked() && !r.Element.IsDisabled() {
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s.list.ScrollToEnd()
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s.seen = n
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slog.Debug("mujica: message_list jump", "unread", r.unread)
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}
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})
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return r
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}
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func messageListSameDay(a, b time.Time) bool {
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ay, am, ad := a.Date()
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by, bm, bd := b.Date()
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return ay == by && am == bm && ad == bd
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}
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// messageListDay is a separator naming the day: today, yesterday or the date.
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func messageListDay(c *ui.Context, t time.Time) {
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k := Tokens(c)
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u := Density(c).Unit()
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label := t.Format(msg(c, "message_list.date"))
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now := c.Now().In(t.Location())
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switch {
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case messageListSameDay(t, now):
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label = msg(c, "message_list.today")
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case messageListSameDay(t, now.AddDate(0, 0, -1)):
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label = msg(c, "message_list.yesterday")
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}
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ui.Row(c).Gap(u*3).AlignItems(ui.Center).Padding(u*2, 0).Role(ui.RoleText).Label(label).Children(func() {
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rule := func() {
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ui.Box(c).Grow(1).Height(theme.BorderWidth).Background(k.Border)
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}
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rule()
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ui.Text(c, label).FontSize(FontSize(c, theme.CaptionSize)).TextColor(k.TextMuted).SingleLine()
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rule()
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})
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}
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