Refactor: popups share overlayStyle and overlayEnter

internal.PopIn is gone. Breadcrumb, NavigationMenu, Pagination, Menubar
panels, CommandPalette, Select (and the other selectPanel users),
datetime popups, ColorPicker and the StatusBar overflow now style their
panel with overlayStyle(c, panel, overlayEnter(c, panel)): one shadow
(0 6 18, 16% black, scaled by entry) and one 160 ms entry fade.

Snapshots: color_picker and command_palette (light and dark) change only
in the panel shadow. ColorPicker loses its 0 4 12 18% shadow for the
softer shared one; CommandPalette loses its heavy 0 12 32 30% shadow,
and its backdrop now fades by alpha with the panel instead of through
the backdrop's opacity. Fade and reduced-motion tests pass unchanged.

breadcrumb.go

@@ -135,9 +135,8 @@ func breadcrumbMore(c *ui.Context, hidden []BreadcrumbItem, choose func(int)) {
 	}
 	b.Children(func() { ui.Icon(c, icons.Must("ellipsis")).Size(16, 16) })
 	ui.PopoverBase(c, b, open, func(panel *ui.Element) {
-		internal.PopIn(c, panel, Motion(c, theme.PopupDuration))
-		panel.Margin(u, 0, 0, 0).Padding(u).Gap(u*0.5).Radius(theme.PopupRadius).Background(k.Surface).
-			Border(theme.BorderWidth, k.Border).Shadow(0, 4, 12, 0, ui.RGBA(0, 0, 0, 0.16)).MinWidth(160).MaxWidth(320)
+		overlayStyle(c, panel, overlayEnter(c, panel))
+		panel.Margin(u, 0, 0, 0).Padding(u).Gap(u * 0.5).MinWidth(160).MaxWidth(320)
 		for j, it := range hidden {
 			item := ui.ButtonBase(c).Role(ui.RoleLink).Justify(ui.Start).Gap(u*2).Padding(u*1.5, u*2).
 				Radius(theme.ControlRadius).MinHeight(Density(c).ControlHeight() - u*2).Label(it.Label).TextColor(k.Text)

color_picker.go

@@ -114,8 +114,8 @@ func ColorPicker(c *ui.Context, color *ui.Color, opts ColorPickerOptions) ColorP
 	})
 	opened := st.open && !st.wasOpen
 	ui.PopoverBase(c, trigger, &st.open, func(panel *ui.Element) {
-		panel.Margin(d.Unit(), 0, 0, 0).Padding(d.Unit()*3).Gap(d.Unit()*3).Width(260).Radius(theme.PopupRadius).
-			Background(k.Surface).Border(theme.BorderWidth, k.Border).Shadow(0, 4, 12, 0, ui.RGBA(0, 0, 0, 0.18))
+		overlayStyle(c, panel, overlayEnter(c, panel))
+		panel.Margin(d.Unit(), 0, 0, 0).Padding(d.Unit() * 3).Gap(d.Unit() * 3).Width(260)
 		colorPickerSquare(c, st, set, opened)
 		x := st.hsv
 		h := x.h

command_palette.go

@@ -80,11 +80,11 @@ func CommandPalette(c *ui.Context, open *bool, commands []Command, opts CommandP
 	u := d.Unit()
 	res.Element = ui.DialogBase(c, open, func(back, panel *ui.Element) {
 		ww, wh := c.Size()
-		back.Background(ui.RGBA(0, 0, 0, 0.4)).Justify(ui.Start)
-		internal.PopIn(c, back, Motion(c, theme.PopupDuration))
-		panel.Margin(wh*0.12, 0, 0, 0).Width(560).MaxWidth(ww-32).MaxHeight(wh*0.76).
-			Radius(theme.PopupRadius).Background(k.Surface).Border(theme.BorderWidth, k.Border).
-			Shadow(0, 12, 32, 0, ui.RGBA(0, 0, 0, 0.3)).AlignItems(ui.Stretch).Label(msg(c, "command_palette.label"))
+		p := overlayEnter(c, panel)
+		back.Background(ui.RGBA(0, 0, 0, 0.4*p)).Justify(ui.Start)
+		overlayStyle(c, panel, p)
+		panel.Margin(wh*0.12, 0, 0, 0).Width(560).MaxWidth(ww - 32).MaxHeight(wh * 0.76).
+			AlignItems(ui.Stretch).Label(msg(c, "command_palette.label"))
 		found := commandPaletteFilter(commands, st.query)
 		var in *ui.Element
 		ui.Row(c).AlignItems(ui.Center).Gap(u*3).Padding(u*3, u*4).Children(func() {

datetime.go

@@ -163,22 +163,14 @@ func datetimeTrigger(c *ui.Context, text, placeholder, icon string) *ui.Element
 
 // datetimePopup shows fn below anchor while *open; a disabled or read-only anchor closes it.
 func datetimePopup(c *ui.Context, anchor *ui.Element, open *bool, readOnly bool, fn func()) *ui.Element {
-	k := Tokens(c)
 	d := Density(c)
 	if *open && (readOnly || anchor.IsDisabled()) {
 		slog.Debug("mujica: datetime popup closed by state", "readOnly", readOnly)
 		*open = false
 	}
 	return ui.PopoverBase(c, anchor, open, func(panel *ui.Element) {
-		born := ui.Local(panel, "datetime-born", func() bool { return true })
-		if *born {
-			panel.Animate("datetime-fade", 0, 0)
-			*born = false
-		}
-		fade := panel.Animate("datetime-fade", 1, Motion(c, theme.PopupDuration))
-		panel.MaxWidth(d.ControlHeight()*7+d.Unit()*6+2*theme.BorderWidth).Margin(d.Unit(), 0, 0, 0).Padding(d.Unit()*3).Gap(d.Unit()*3).Radius(theme.PopupRadius).
-			Background(k.Surface).Border(theme.BorderWidth, k.Border).
-			Shadow(0, 6, 18, 0, ui.RGBA(0, 0, 0, 0.16)).Opacity(fade)
+		overlayStyle(c, panel, overlayEnter(c, panel))
+		panel.MaxWidth(d.ControlHeight()*7+d.Unit()*6+2*theme.BorderWidth).Margin(d.Unit(), 0, 0, 0).Padding(d.Unit() * 3).Gap(d.Unit() * 3)
 		fn()
 	})
 }

internal/navigation.go

@@ -17,15 +17,3 @@ func Ease(e *ui.Element, d time.Duration, fg ui.Color) *ui.Element {
 	}
 	return e.TextColor(ui.Color{R: ch("mujica.fg.r", fg.R), G: ch("mujica.fg.g", fg.G), B: ch("mujica.fg.b", fg.B), A: ch("mujica.fg.a", fg.A)})
 }
-
-// PopIn fades popup e in over d from the frame it appeared and returns the progress, 0 to 1.
-func PopIn(c *ui.Context, e *ui.Element, d time.Duration) float32 {
-	born := ui.Local(e, "mujica.popin", func() time.Time { return c.Now() })
-	p := float32(1)
-	if t := float32(c.Now().Sub(*born)) / float32(max(d, 1)); d > 0 && t < 1 {
-		p = ui.EaseOut(t)
-		c.AnimationFrame()
-	}
-	e.Opacity(p)
-	return p
-}

menubar_panel.go

@@ -67,10 +67,8 @@ func (m *menubarRun) panel(l int, x, y float32, parent ui.Rect) (*ui.Element, *u
 	items := m.items(l)
 	ww, wh := c.Size()
 	// Long menus scroll within the window instead of running off it.
-	panel := ui.Scroll(c).Absolute().Padding(u).MinWidth(200).MaxHeight(wh-8).AlignItems(ui.Stretch).Role(ui.RolePopup).
-		Radius(theme.PopupRadius).Background(k.Surface).Border(theme.BorderWidth, k.Border).
-		Shadow(0, 6, 16, 0, ui.RGBA(0, 0, 0, 0.18))
-	internal.PopIn(c, panel, Motion(c, theme.PopupDuration))
+	panel := ui.Scroll(c).Absolute().Padding(u).MinWidth(200).MaxHeight(wh - 8).AlignItems(ui.Stretch).Role(ui.RolePopup)
+	overlayStyle(c, panel, overlayEnter(c, panel))
 	pb := panel.Bounds()
 	if x+pb.W > ww-4 {
 		x = ww - 4 - pb.W

navigation_menu.go

@@ -147,12 +147,11 @@ func navigationMenuTop(c *ui.Context, l NavigationLink, path string, push func(s
 		*open = true
 	}
 	ui.PopoverBase(c, b, open, func(panel *ui.Element) {
-		internal.PopIn(c, panel, Motion(c, theme.PopupDuration))
+		overlayStyle(c, panel, overlayEnter(c, panel))
 		// Capped to the room beside the anchor; the links scroll inside.
 		_, wh := c.Size()
 		r := b.Bounds()
-		panel.Margin(u, 0, 0, 0).Padding(u*2).Radius(theme.PopupRadius).Background(k.Surface).MaxHeight(max(r.Y, wh-r.Y-r.H)-16).
-			Border(theme.BorderWidth, k.Border).Shadow(0, 4, 12, 0, ui.RGBA(0, 0, 0, 0.16)).MinWidth(240).MaxWidth(360)
+		panel.Margin(u, 0, 0, 0).Padding(u * 2).MaxHeight(max(r.Y, wh-r.Y-r.H) - 16).MinWidth(240).MaxWidth(360)
 		ui.Scroll(c).Shrink(1).Gap(u).FocusGroup(ui.Vertical).Children(func() {
 			navigationMenuPanel(c, l.Items, path, open, push)
 		})

pagination.go

@@ -175,9 +175,8 @@ func paginationSizes(c *ui.Context, page, pageSize *int, sizes []int, res *Choic
 		ui.Icon(c, icons.Must("chevron-down")).Size(14, 14).TextColor(k.TextMuted)
 	})
 	sel.Popup(func(panel *ui.Element) {
-		internal.PopIn(c, panel, Motion(c, theme.PopupDuration))
-		panel.Margin(u, 0, 0, 0).Padding(u).Radius(theme.PopupRadius).Background(k.Surface).
-			Border(theme.BorderWidth, k.Border).Shadow(0, 4, 12, 0, ui.RGBA(0, 0, 0, 0.16))
+		overlayStyle(c, panel, overlayEnter(c, panel))
+		panel.Margin(u, 0, 0, 0).Padding(u)
 		for _, s := range sizes {
 			it := sel.Item(s).Padding(u*1.5, u*3).Radius(theme.ControlRadius).Gap(u * 2)
 			if it.Highlighted() {

select.go

@@ -239,9 +239,8 @@ func selectCheck(c *ui.Context, on bool) {
 
 // selectPanel styles a popup panel.
 func selectPanel(c *ui.Context, panel *ui.Element) {
-	k := Tokens(c)
-	panel.Margin(4, 0, 0, 0).Padding(4).Radius(theme.PopupRadius).Background(k.Surface).
-		Border(theme.BorderWidth, k.Border).Shadow(0, 4, 12, 0, ui.RGBA(0, 0, 0, 0.14))
+	overlayStyle(c, panel, overlayEnter(c, panel))
+	panel.Margin(4, 0, 0, 0).Padding(4)
 }
 
 // selectRow styles an option row: chosen has the selection fill and a check, highlighted a side bar.

status_bar.go

@@ -108,9 +108,8 @@ func StatusBar(c *ui.Context, opts StatusBarOptions) StatusBarResult {
 			}
 			if *open {
 				ui.PopoverBase(c, more, open, func(panel *ui.Element) {
-					panel.Margin(d.Unit(), 0, 0, 0).Padding(d.Unit()).Gap(d.Unit()).AlignItems(ui.Stretch).
-						Radius(theme.PopupRadius).Background(k.Surface).Border(theme.BorderWidth, k.Border).
-						Shadow(0, 4, 12, 0, ui.RGBA(0, 0, 0, 0.16))
+					overlayStyle(c, panel, overlayEnter(c, panel))
+					panel.Margin(d.Unit(), 0, 0, 0).Padding(d.Unit()).Gap(d.Unit()).AlignItems(ui.Stretch)
 					for _, it := range statusBarAll(opts) {
 						if hidden[it.ID] {
 							item(it)