111 lines
3.4 KiB
Go
111 lines
3.4 KiB
Go
package mujica
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import (
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"fmt"
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"log/slog"
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"time"
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"github.com/egoist/mygo/ui"
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)
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// YearMonth is a month of a year. The zero value means no month.
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type YearMonth struct {
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Year int
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Month time.Month
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}
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// IsZero reports whether m is the empty month.
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func (m YearMonth) IsZero() bool { return m == YearMonth{} }
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// String formats m as 2006-01, or "" when empty.
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func (m YearMonth) String() string {
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if m.IsZero() {
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return ""
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}
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return fmt.Sprintf("%04d-%02d", m.Year, m.Month)
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}
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func (m YearMonth) ordinal() int { return m.Year*12 + int(m.Month) - 1 }
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func yearMonthOf(o int) YearMonth {
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y := o / 12
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if o < 0 && o%12 != 0 {
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y--
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}
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return YearMonth{y, time.Month(o-y*12) + 1}
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}
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// MonthPickerOptions configure a MonthPicker.
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type MonthPickerOptions struct {
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// Min and Max bound the months chosen; zero leaves a side open.
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Min, Max YearMonth
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DisableMonth func(YearMonth) bool
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Clearable bool
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// Today marks the current month; zero uses the system clock.
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Today Date
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Disabled bool
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// Label names the field for assistive technology.
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Label string
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}
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// MonthPicker chooses a month into *value from a year page; PageUp and PageDown change the year.
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func MonthPicker(c *ui.Context, value *YearMonth, opts MonthPickerOptions) DateTimeResult {
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for _, m := range []YearMonth{*value, opts.Min, opts.Max} {
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if !m.IsZero() && (m.Month < time.January || m.Month > time.December) {
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panic(fmt.Sprintf("mujica: MonthPicker month %v is not valid", m))
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}
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}
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if !opts.Min.IsZero() && !opts.Max.IsZero() && opts.Min.ordinal() > opts.Max.ordinal() {
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panic(fmt.Sprintf("mujica: MonthPicker Min %v is after Max %v", opts.Min, opts.Max))
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}
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today := datetimeToday(c, opts.Today)
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now := YearMonth{today.Year, today.Month}
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title := func(m YearMonth) string { return datetimeMonthTitle(c, m.Year, m.Month) }
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home := *value
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if home.IsZero() {
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home = now
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}
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text := ""
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if !value.IsZero() {
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text = title(*value)
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}
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label := opts.Label
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if label == "" {
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label = msg(c, "month_picker.placeholder")
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}
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col, picked, ok, cleared := datetimeGridPicker(c, datetimeGridField{
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text: text, placeholder: msg(c, "month_picker.placeholder"), label: label,
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clearable: opts.Clearable, hasValue: !value.IsZero(), disabled: opts.Disabled, home: home.ordinal(),
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}, datetimeGridConfig{
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pageOf: func(o int) (int, int) { return yearMonthOf(o).Year * 12, 12 },
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cols: 3,
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page: 12,
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title: func(start int) string { return fmt.Sprintf(msg(c, "month_picker.year"), yearMonthOf(start).Year) },
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prev: msg(c, "calendar.prev_year"),
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next: msg(c, "calendar.next_year"),
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text: func(o int) string { return datetimeMonthName(c, yearMonthOf(o).Month) },
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label: func(o int) string { return title(yearMonthOf(o)) },
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chosen: func(o int) bool { return !value.IsZero() && o == value.ordinal() },
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current: func(o int) bool { return o == now.ordinal() },
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enabled: func(o int) bool {
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m := yearMonthOf(o)
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return (opts.Min.IsZero() || o >= opts.Min.ordinal()) && (opts.Max.IsZero() || o <= opts.Max.ordinal()) &&
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(opts.DisableMonth == nil || !opts.DisableMonth(m))
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},
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muted: func(int, int) bool { return false },
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})
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to := *value
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switch {
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case cleared:
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to = YearMonth{}
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case ok:
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to = yearMonthOf(picked)
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}
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changed := to != *value
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if changed {
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slog.Debug("mujica: month_picker change", "from", *value, "to", to)
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*value = to
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}
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return DateTimeResult{Element: col, changed: changed}
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}
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