45 lines
1.2 KiB
Go
45 lines
1.2 KiB
Go
package core
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import (
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"time"
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"github.com/egoist/mygo/ui"
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"git.zacharyzhang.com/ZacharyZhang-NY/MujicaUI/theme"
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)
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// OverlayEnter returns how far, 0 to 1, the popup born with e has entered.
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func OverlayEnter(c *ui.Context, e *ui.Element) float32 {
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born := ui.Local(e, "mujica.overlay.born", func() time.Time { return c.Now() })
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d := Motion(c, theme.PopupDuration)
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if d == 0 {
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return 1
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}
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t := float32(c.Now().Sub(*born)) / float32(d)
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if t >= 1 {
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return 1
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}
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c.AnimationFrame()
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return ui.EaseOut(t)
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}
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// OverlayStyle gives a popup panel the surface, edge and shadow of the theme.
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func OverlayStyle(c *ui.Context, panel *ui.Element, p float32) {
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k := Tokens(c)
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panel.Background(k.Surface).Border(theme.BorderWidth, k.Border).Radius(theme.PopupRadius).
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TextColor(k.Text).Opacity(p).Shadow(0, 6, 18, 0, ui.RGBA(0, 0, 0, 0.16*p))
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}
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// PlaceOverlay puts a w×h box below anchor a, above when there is no room, inside the window.
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func PlaceOverlay(c *ui.Context, a ui.Rect, w, h, gap float32) (x, y float32) {
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ww, wh := c.Size()
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const edge = 4
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x, y = a.X, a.Y+a.H+gap
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if y+h > wh-edge && a.Y-gap-h >= edge {
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y = a.Y - gap - h
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}
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x = max(edge, min(x, ww-edge-w))
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y = max(edge, min(y, wh-edge-h))
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return x, y
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}
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