68 lines
1.9 KiB
Go
68 lines
1.9 KiB
Go
package feedback
|
|
|
|
import (
|
|
"fmt"
|
|
"math"
|
|
"time"
|
|
|
|
"github.com/egoist/mygo/ui"
|
|
|
|
"git.zacharyzhang.com/ZacharyZhang-NY/MujicaUI/core"
|
|
"git.zacharyzhang.com/ZacharyZhang-NY/MujicaUI/theme"
|
|
)
|
|
|
|
// ReorderTransitionOptions configure a ReorderTransition.
|
|
type ReorderTransitionOptions struct {
|
|
// Duration of a move; zero means StateDuration.
|
|
Duration time.Duration
|
|
// Gap between items in DIPs.
|
|
Gap float32
|
|
}
|
|
|
|
// ReorderTransition slides keyed items to their new places.
|
|
func ReorderTransition[K comparable](c *ui.Context, keys []K, opts ReorderTransitionOptions, item func(key K)) *ui.Element {
|
|
if opts.Duration < 0 || !(opts.Gap >= 0) || math.IsInf(float64(opts.Gap), 0) {
|
|
panic("mujica: ReorderTransition Duration and Gap must not be negative")
|
|
}
|
|
d := opts.Duration
|
|
if d == 0 {
|
|
d = theme.StateDuration
|
|
}
|
|
seen := make(map[K]bool, len(keys))
|
|
for _, k := range keys {
|
|
if seen[k] {
|
|
panic(fmt.Sprintf("mujica: ReorderTransition duplicate key %v", k))
|
|
}
|
|
seen[k] = true
|
|
}
|
|
move := ui.ElementTransition{Duration: core.Motion(c, d), Position: true, Enter: &ui.Motion{}, Exit: &ui.Motion{}}
|
|
col := ui.Column(c).AlignItems(ui.Stretch).Gap(opts.Gap)
|
|
type state struct {
|
|
keys []K
|
|
leaving map[K]time.Time
|
|
}
|
|
st := ui.Local(col, "reorder", func() state { return state{leaving: map[K]time.Time{}} })
|
|
for _, k := range st.keys {
|
|
if !seen[k] {
|
|
st.leaving[k] = c.Now().Add(d)
|
|
}
|
|
}
|
|
st.keys = append(st.keys[:0], keys...)
|
|
col.Children(func() {
|
|
for _, k := range keys {
|
|
ui.Column(c).Key(k).AlignItems(ui.Stretch).Transition(move).Children(func() { item(k) })
|
|
}
|
|
for k, until := range st.leaving {
|
|
if seen[k] || !c.Now().Before(until) {
|
|
delete(st.leaving, k)
|
|
continue
|
|
}
|
|
if c.Preferences().ReduceMotion {
|
|
ui.Column(c).Key(k).Absolute().Invisible().Transition(ui.ElementTransition{Duration: d, Position: true})
|
|
delete(st.leaving, k)
|
|
}
|
|
}
|
|
})
|
|
return col
|
|
}
|