48 lines
1.1 KiB
Go
48 lines
1.1 KiB
Go
package feedback
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import (
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"strconv"
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"time"
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"github.com/egoist/mygo/ui"
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"git.zacharyzhang.com/ZacharyZhang-NY/8bitMyGoUI/pixel"
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)
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type CountUpOptions struct {
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// Scale is 1–4; zero means 1.
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Scale int
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Slot pixel.Slot
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}
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type countKey struct{}
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// counting runs from one value to the next.
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type counting struct {
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from, to int
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at time.Time
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}
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// CountUp counts to a new value in eight steps.
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func CountUp(c *ui.Context, value int, o CountUpOptions) *ui.Element {
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k := pixel.K(c)
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sc := pixel.Or("CountUp Scale", o.Scale, 1)
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e := ui.Box(c).Role(ui.RoleText).Label(strconv.Itoa(value))
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s := ui.Local(e, countKey{}, func() counting { return counting{from: value, to: value} })
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shown := func() int {
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step := 8
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if !k.Reduce() {
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step = since(c, k, s.at, 15, 8)
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}
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return s.from + (s.to-s.from)*step/8
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}
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if value != s.to {
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s.from, s.to, s.at = shown(), value, k.Now()
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}
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n := strconv.Itoa(shown())
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w := max(pixel.Measure(strconv.Itoa(s.from)), pixel.Measure(strconv.Itoa(s.to)))
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return e.Size(k.D(w*sc), k.D(pixel.LineHeight*sc)).Draw(func(p *ui.Painter, r ui.Rect) {
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k.Canvas(p, r).Text(0, 0, n, o.Slot, sc)
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})
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}
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