Date & Time: components 051-058 (wip)
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package mujica
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import (
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"fmt"
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"time"
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"github.com/egoist/mygo/ui"
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"mujicaui/icons"
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"mujicaui/internal"
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"mujicaui/theme"
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)
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// Date is a calendar day with no time of day and no location.
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// The zero value means no date.
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type Date struct {
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Year int
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Month time.Month
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Day int
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}
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// DateOf returns the day t falls on in t's own location, without converting it.
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func DateOf(t time.Time) Date {
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y, m, d := t.Date()
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return Date{y, m, d}
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}
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// IsZero reports whether d is the empty date.
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func (d Date) IsZero() bool { return d == Date{} }
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// Valid reports whether d names a real day.
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func (d Date) Valid() bool { return !d.IsZero() && DateOf(d.civil()) == d }
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// String formats d as 2006-01-02, or "" when empty.
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func (d Date) String() string {
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if d.IsZero() {
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return ""
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}
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return fmt.Sprintf("%04d-%02d-%02d", d.Year, d.Month, d.Day)
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}
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// Format formats d with a Go time layout.
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func (d Date) Format(layout string) string { return d.civil().Format(layout) }
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// Compare returns -1, 0 or 1 as d is before, equal to or after o.
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func (d Date) Compare(o Date) int { return d.civil().Compare(o.civil()) }
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// AddDays returns d moved by n days.
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func (d Date) AddDays(n int) Date { return DateOf(d.civil().AddDate(0, 0, n)) }
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// AddMonths returns d moved by n months, keeping the day within the month.
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func (d Date) AddMonths(n int) Date {
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first := time.Date(d.Year, d.Month+time.Month(n), 1, 0, 0, 0, 0, time.UTC)
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last := first.AddDate(0, 1, -1).Day()
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return Date{first.Year(), first.Month(), min(d.Day, last)}
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}
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// Weekday returns the day of the week of d.
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func (d Date) Weekday() time.Weekday { return d.civil().Weekday() }
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// civil is d at midnight on a fixed clock, only for arithmetic.
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func (d Date) civil() time.Time { return time.Date(d.Year, d.Month, d.Day, 0, 0, 0, 0, time.UTC) }
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// within reports whether d lies inside the optional bounds lo and hi.
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func (d Date) within(lo, hi Date) bool {
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return (lo.IsZero() || d.Compare(lo) >= 0) && (hi.IsZero() || d.Compare(hi) <= 0)
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}
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// DateTimeResult is a date or time component and what happened to it this frame.
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type DateTimeResult struct {
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*ui.Element
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changed bool
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cancelled bool
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}
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// Changed reports whether the component wrote a new value this frame.
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func (r DateTimeResult) Changed() bool { return r.changed }
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// Cancelled reports whether the user discarded a pending edit this frame.
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func (r DateTimeResult) Cancelled() bool { return r.cancelled }
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// datetimeCheckDate panics when a non-empty date is not a real day.
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func datetimeCheckDate(name string, d Date) {
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if !d.IsZero() && !d.Valid() {
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panic(fmt.Sprintf("mujica: %s %v is not a calendar date", name, d))
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}
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}
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// datetimeCheckBounds panics on invalid or inverted Min and Max.
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func datetimeCheckBounds(name string, lo, hi Date) {
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datetimeCheckDate(name+" Min", lo)
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datetimeCheckDate(name+" Max", hi)
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if !lo.IsZero() && !hi.IsZero() && lo.Compare(hi) > 0 {
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panic(fmt.Sprintf("mujica: %s Min %v is after Max %v", name, lo, hi))
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}
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}
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// datetimeToday returns today, or the caller's fixed day when set.
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func datetimeToday(c *ui.Context, fixed Date) Date {
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if !fixed.IsZero() {
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datetimeCheckDate("Today", fixed)
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return fixed
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}
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return DateOf(c.Now())
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}
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// datetimeMonthName returns the localized name of m.
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func datetimeMonthName(c *ui.Context, m time.Month) string {
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return msg(c, fmt.Sprintf("calendar.month_%d", int(m)))
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}
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// datetimeMonthTitle returns the localized title of a month, as "October 2026".
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func datetimeMonthTitle(c *ui.Context, y int, m time.Month) string {
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return fmt.Sprintf(msg(c, "calendar.title"), datetimeMonthName(c, m), y)
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}
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// datetimeDayLabel returns the localized spoken name of d.
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func datetimeDayLabel(c *ui.Context, d Date) string {
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wd := msg(c, fmt.Sprintf("calendar.weekday_long_%d", int(d.Weekday())))
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return fmt.Sprintf(msg(c, "calendar.day_label"), wd, datetimeMonthName(c, d.Month), d.Day, d.Year)
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}
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// datetimeIconButton is a square, borderless button showing icon, named label.
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func datetimeIconButton(c *ui.Context, icon, label string) *ui.Element {
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k := Tokens(c)
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b := ui.ButtonBase(c).Size(theme.MinHitSize, theme.MinHitSize).Radius(theme.ControlRadius).Label(label)
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internal.Ring(b, k.Focus, theme.ControlRadius)
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switch {
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case b.Pressed():
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b.Background(k.Selection)
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case b.Hovered():
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b.Background(k.SurfaceHover)
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}
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b.TextColor(k.TextMuted).Children(func() { ui.Icon(c, icons.Must(icon)).Size(16, 16) })
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return b
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}
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// datetimeField styles row as a single-line field: solid fill and fine border.
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func datetimeField(c *ui.Context, row *ui.Element, invalid bool) *ui.Element {
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k := Tokens(c)
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d := Density(c)
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border := k.ControlBorder
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switch {
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case invalid:
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border = k.Danger
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case row.FocusWithin():
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border = k.Focus
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case row.Hovered():
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border = k.Text
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}
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return row.MinHeight(d.ControlHeight()).Padding(0, d.Unit()).PaddingX(d.Unit()*3).Gap(d.Unit()).
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AlignItems(ui.Center).Radius(theme.ControlRadius).Background(k.Surface).Border(theme.BorderWidth, border)
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}
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// datetimeTrigger is the button inside a field that shows text and opens a popup.
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func datetimeTrigger(c *ui.Context, text, placeholder, icon string) *ui.Element {
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k := Tokens(c)
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b := ui.ButtonBase(c).Grow(1).Shrink(1).Justify(ui.Start).Gap(Density(c).Unit() * 2).
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MinHeight(theme.MinHitSize).Radius(theme.ControlRadius)
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internal.Ring(b, k.Focus, theme.ControlRadius)
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b.Children(func() {
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ui.Icon(c, icons.Must(icon)).Size(16, 16).TextColor(k.TextMuted)
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if text == "" {
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ui.Text(c, placeholder).TextColor(k.TextMuted).SingleLine()
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} else {
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ui.Text(c, text).TextColor(k.Text).SingleLine().FontFeatures("tnum")
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}
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})
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return b
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}
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// datetimePopup shows fn in a popup panel below anchor while *open is set.
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func datetimePopup(c *ui.Context, anchor *ui.Element, open *bool, fn func()) *ui.Element {
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k := Tokens(c)
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d := Density(c)
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return ui.PopoverBase(c, anchor, open, func(panel *ui.Element) {
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born := ui.Local(panel, "datetime-born", func() bool { return true })
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if *born {
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panel.Animate("datetime-fade", 0, 0)
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*born = false
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}
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fade := panel.Animate("datetime-fade", 1, Motion(c, theme.PopupDuration))
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panel.MaxWidth(d.ControlHeight()*7+d.Unit()*6+2*theme.BorderWidth).Margin(d.Unit(), 0, 0, 0).Padding(d.Unit()*3).Gap(d.Unit()*3).Radius(theme.PopupRadius).
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Background(k.Surface).Border(theme.BorderWidth, k.Border).
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Shadow(0, 6, 18, 0, ui.RGBA(0, 0, 0, 0.16)).Opacity(fade)
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fn()
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})
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}
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// datetimeError shows a field error in Danger beneath a control.
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func datetimeError(c *ui.Context, text string) {
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if text == "" {
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return
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}
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ui.Text(c, text).FontSize(theme.CaptionSize).TextColor(Tokens(c).Danger).Role(ui.RoleStatus)
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}
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// datetimeFooter lays out popup actions at the end of a row.
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func datetimeFooter(c *ui.Context, fn func()) {
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ui.Row(c).Gap(Density(c).Unit() * 2).Justify(ui.End).AlignItems(ui.Center).FillWidth().Children(fn)
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}
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