55 lines
1.5 KiB
Go
55 lines
1.5 KiB
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 BusyOverlayOptions struct{}
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type busyKey struct{}
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// BusyOverlay veils busy content, whose controls then take no input.
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func BusyOverlay(c *ui.Context, busy bool, o BusyOverlayOptions, content func()) *ui.Element {
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k := pixel.K(c)
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outer := ui.Box(c)
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// held is whether the veil had the focus last frame.
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held := ui.Local(outer, busyKey{}, func() bool { return false })
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if !busy && *held {
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// From the root, parked controls inside take it back.
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c.Root().Focus()
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*held = false
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}
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if busy {
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// Busy content is one Tab stop: the veil.
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outer.FocusGroup(ui.Vertical)
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}
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return outer.Children(func() {
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s := pixel.Current(c)
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s.Inert = s.Inert || busy
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before := c.Root().Focused()
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var body *ui.Element
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pixel.Scope(c, s, func() { body = ui.Box(c).Children(content) })
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if !busy {
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return
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}
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veil := ui.Box(c).Absolute().Left(0).Top(0).Right(0).Bottom(0).Focusable().FocusRing(false).Role(ui.RoleProgress).Label(k.Msg("wait"))
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if body.FocusWithin() || !before && c.Root().Focused() {
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veil.Focus()
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}
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*held = veil.Focused()
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focus := veil.FocusVisible()
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veil.Draw(func(p *ui.Painter, r ui.Rect) {
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g := k.Canvas(p, r)
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g.Checker(0, 0, g.W, g.H, pixel.Back)
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// The spinner doubles in size where it fits.
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sc := max(1, min(2, min(g.W, g.H)/14))
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beads(g, (g.W-12*sc)/2, (g.H-12*sc)/2, sc)
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if focus {
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g.FocusMark(0, 0, g.W, g.H)
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}
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})
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})
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}
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