27 lines
631 B
Go
27 lines
631 B
Go
package feedback
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import (
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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 ShakeOptions struct {
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// Cue shakes the child each time it changes.
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Cue int
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}
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// shakes are the child's offsets in dots, a step each.
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var shakes = [...]int{2, -2, 2, -2, 1, -1, 0}
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// Shake jolts its child side to side briefly.
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func Shake(c *ui.Context, o ShakeOptions, content func()) *ui.Element {
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k := pixel.K(c)
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e := ui.Box(c)
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dx := 0
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if step := k.Since(c, cue(e, k, o.Cue), 20, len(shakes)-1); !k.Reduce() {
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dx = shakes[step]
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}
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return e.Padding(0, k.D(2-dx), 0, k.D(2+dx)).Children(content)
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}
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