Choices: review r1 fixes

cascader.go

@@ -43,8 +43,7 @@ type CascaderLevel struct {
 type CascaderOptions struct {
 	// Level returns the children under path; the empty path is the roots.
 	Level func(path []string) CascaderLevel
-	// Load fetches the children under path, once while Idle and on retry; it
-	// should mark the level Loading and finish through Window.Update.
+	// Load fetches the children under path while Idle and on retry; it marks the level Loading.
 	Load func(path []string)
 	// AnyLevel lets branches be chosen too; by default only leaves are.
 	AnyLevel bool
@@ -66,9 +65,7 @@ type cascaderState struct {
 
 type cascaderKey struct{}
 
-// Cascader chooses a path through levels the caller supplies, loading
-// children on demand. Up and Down move in a column, Right opens a branch,
-// Left goes back, Enter or Space chooses; Escape closes.
+// Cascader chooses a path through levels the caller supplies, loading children on demand.
 func Cascader(c *ui.Context, path *[]string, opts CascaderOptions) ChoiceResult {
 	if opts.Level == nil {
 		panic("mujica: Cascader needs Level")
@@ -79,6 +76,9 @@ func Cascader(c *ui.Context, path *[]string, opts CascaderOptions) ChoiceResult
 		tr.Label(opts.Label)
 	}
 	st := *ui.Local(tr, cascaderKey{}, func() *cascaderState { return &cascaderState{requested: map[string]bool{}} })
+	if opts.Disabled {
+		st.open = false
+	}
 	if tr.Clicked() || (!st.open && tr.Shortcut(0, ui.KeyDown)) {
 		st.open = !st.open
 		if st.open {
@@ -186,7 +186,7 @@ func cascaderRow(c *ui.Context, st *cascaderState, path *[]string, opts Cascader
 	d := Density(c)
 	full := append(slices.Clone(prefix), n.Value)
 	depth := len(prefix)
-	b := ui.ButtonBase(c).Key(n.Value).Disabled(n.Disabled).MinHeight(d.ControlHeight()-4).Padding(0, d.Unit()*2).
+	b := ui.ButtonBase(c).Key(n.Value).Disabled(n.Disabled).MinHeight(d.ControlHeight()).Padding(0, d.Unit()*2).
 		Gap(d.Unit() * 2).Justify(ui.Start).Radius(theme.ControlRadius).FillWidth().Role(ui.RoleListItem)
 	internal.Ring(b, k.Focus, theme.ControlRadius)
 	if st.focusSet && (slices.Equal(st.focus, full) || first && slices.Equal(st.focus, append(slices.Clone(prefix), ""))) {
@@ -214,6 +214,7 @@ func cascaderRow(c *ui.Context, st *cascaderState, path *[]string, opts Cascader
 		st.focus, st.focusSet = slices.Clone(prefix), true
 	}
 	chosen := len(*path) > depth && slices.Equal((*path)[:depth+1], full)
+	b.Selected(chosen).Background(ui.Transparent).TextColor(k.Text)
 	switch {
 	case on:
 		b.Background(k.Selection)
@@ -224,6 +225,7 @@ func cascaderRow(c *ui.Context, st *cascaderState, path *[]string, opts Cascader
 		b.TextColor(k.AccentText)
 	}
 	b.Children(func() {
+		selectCheck(c, chosen)
 		ui.Text(c, n.Label).SingleLine().Grow(1).Shrink(1)
 		if !n.Leaf {
 			ui.Box(c).Size(14, 14).Shrink(0).Draw(func(p *ui.Painter, r ui.Rect) {

choice_blocked_test.go

@@ -0,0 +1,105 @@
+package mujica
+
+import (
+	"testing"
+
+	"github.com/egoist/mygo/ui"
+)
+
+// choiceBetween builds control between two buttons, for Tab order checks.
+func choiceBetween(control func(c *ui.Context)) *ui.Tester {
+	return ui.NewTester(func(c *ui.Context) {
+		Use(c, Settings{})
+		ui.Column(c).Padding(10).Gap(10).Width(300).Children(func() {
+			Button(c, "Before", ButtonOptions{})
+			control(c)
+			Button(c, "After", ButtonOptions{})
+		})
+	}, 400, 400)
+}
+
+// choiceTabSkips reports whether Tab from Before lands on After.
+func choiceTabSkips(t *testing.T, tt *ui.Tester) bool {
+	t.Helper()
+	if err := tt.Click("Before"); err != nil {
+		t.Fatal(err)
+	}
+	tt.Key(0, ui.KeyTab)
+	return tt.Focused("After")
+}
+
+func TestToggleDisabled(t *testing.T) {
+	for _, disabled := range []bool{false, true} {
+		on := false
+		tt := choiceBetween(func(c *ui.Context) {
+			Toggle(c, &on, "Italic", ToggleOptions{Disabled: disabled})
+		})
+		_ = tt.Click("Italic")
+		if on == disabled {
+			t.Fatalf("disabled=%v: click left on=%v", disabled, on)
+		}
+		if choiceTabSkips(t, tt) != disabled {
+			t.Fatalf("disabled=%v: Tab skip wrong", disabled)
+		}
+	}
+}
+
+func TestSliderDisabled(t *testing.T) {
+	for _, disabled := range []bool{false, true} {
+		v := 30.0
+		tt := choiceBetween(func(c *ui.Context) {
+			Slider(c, &v, SliderOptions{Step: 1, Disabled: disabled, Label: "Volume"})
+		})
+		_ = tt.Click("Volume")
+		if (v != 30) == disabled {
+			t.Fatalf("disabled=%v: click left %v", disabled, v)
+		}
+		if choiceTabSkips(t, tt) != disabled {
+			t.Fatalf("disabled=%v: Tab skip wrong", disabled)
+		}
+	}
+}
+
+func TestRangeSliderDisabled(t *testing.T) {
+	for _, disabled := range []bool{false, true} {
+		low, high := 20.0, 40.0
+		tt := choiceBetween(func(c *ui.Context) {
+			RangeSlider(c, &low, &high, RangeSliderOptions{Step: 1, Disabled: disabled, Label: "Price"})
+		})
+		_ = tt.Click("Price")
+		if (high != 40) == disabled || low != 20 {
+			t.Fatalf("disabled=%v: click left %v..%v", disabled, low, high)
+		}
+		if choiceTabSkips(t, tt) != disabled {
+			t.Fatalf("disabled=%v: Tab skip wrong", disabled)
+		}
+	}
+}
+
+// Disabling a focused control in the frame a key arrives must block the key.
+func TestChoiceDisabledWhileFocused(t *testing.T) {
+	disabled := false
+	on, pressed, group := false, false, []string{"left"}
+	items := []ToggleItem[string]{{Value: "left", Label: "Left"}, {Value: "right", Label: "Right"}}
+	for name, build := range map[string]func(c *ui.Context){
+		"switch": func(c *ui.Context) { Switch(c, &on, "Sync", SwitchOptions{Disabled: disabled}) },
+		"toggle": func(c *ui.Context) { Toggle(c, &pressed, "Bold", ToggleOptions{Disabled: disabled}) },
+		"group": func(c *ui.Context) {
+			items[1].Disabled = disabled
+			ToggleGroup(c, &group, items, ToggleGroupOptions{})
+		},
+	} {
+		disabled, on, pressed, group = false, false, false, []string{"left"}
+		tt := choiceBetween(build)
+		tt.Key(0, ui.KeyTab)
+		tt.Key(0, ui.KeyTab)
+		if name == "group" {
+			tt.Key(0, ui.KeyRight)
+		}
+		disabled = true
+		tt.Key(0, ui.KeySpace)
+		if on || pressed || group[0] != "left" {
+			t.Errorf("%s: Space changed a disabled control: %v %v %v", name, on, pressed, group)
+		}
+	}
+}

choice_review_test.go

@@ -0,0 +1,211 @@
+package mujica
+
+import (
+	"image/color"
+	"slices"
+	"testing"
+
+	"github.com/egoist/mygo/ui"
+
+	"mujicaui/internal"
+	"mujicaui/theme"
+)
+
+// A popup left open must stop taking choices once its control is disabled.
+func TestChoicePopupsCloseWhenDisabled(t *testing.T) {
+	disabled := false
+	var multi []int
+	var paths, ids []string
+	f := newCascaderFake()
+	cases := []struct {
+		name, open, pick string
+		build            func(c *ui.Context)
+		same             func() bool
+	}{
+		{"multi", "Select…", "Lily", func(c *ui.Context) {
+			MultiSelect(c, &multi, multiSelectTestOptions, MultiSelectOptions{Disabled: disabled})
+		}, func() bool { return len(multi) == 0 }},
+		{"cascader", "Select…", "Europe", func(c *ui.Context) {
+			Cascader(c, &paths, CascaderOptions{Level: f.level, Load: f.load, AnyLevel: true, Disabled: disabled})
+		}, func() bool { return len(paths) == 0 }},
+		{"tree", "Select…", "Guard", func(c *ui.Context) {
+			TreeSelect(c, &ids, treeSelectTestNodes, TreeSelectOptions{Disabled: disabled})
+		}, func() bool { return len(ids) == 0 }},
+	}
+	for _, tc := range cases {
+		disabled = false
+		tt := ui.NewTester(func(c *ui.Context) {
+			Use(c, Settings{})
+			ui.Column(c).Padding(10).Children(func() { tc.build(c) })
+		}, 700, 500)
+		if err := tt.Click(tc.open); err != nil {
+			t.Fatal(err)
+		}
+		if !tt.HasText(tc.pick) {
+			t.Fatalf("%s: popup did not open", tc.name)
+		}
+		disabled = true
+		tt.Frame()
+		_ = tt.Click(tc.pick)
+		if !tc.same() || tt.HasText(tc.pick) {
+			t.Errorf("%s: disabled control took a choice or kept its popup", tc.name)
+		}
+	}
+}
+
+func TestTreeSelectSingleMarksOwnNode(t *testing.T) {
+	single := TreeSelectOptions{}
+	court := &treeSelectTestNodes[0]
+	if got := treeSelectCheck(court, []string{"court"}, single); got != internal.Checked {
+		t.Fatalf("chosen parent shows %v", got)
+	}
+	if got := treeSelectCheck(court, []string{"king", "queen"}, single); got != internal.Unchecked {
+		t.Fatalf("parent of chosen leaves shows %v", got)
+	}
+	var sel []string
+	changes := 0
+	tt := treeSelectTester(&sel, single, &changes)
+	_ = tt.Click("Select…")
+	_ = tt.Click("Court")
+	if !slices.Equal(sel, []string{"court"}) {
+		t.Fatalf("sel %v", sel)
+	}
+}
+
+func TestTreeSelectRightSkipsHiddenChildren(t *testing.T) {
+	var sel []string
+	changes := 0
+	tt := treeSelectTester(&sel, TreeSelectOptions{Multiple: true}, &changes)
+	_ = tt.Click("Select…")
+	tt.Type("queen")
+	tt.Key(0, ui.KeyDown)
+	if !tt.Focused("Court") {
+		t.Fatal("Down did not reach Court")
+	}
+	tt.Key(0, ui.KeyRight)
+	if !tt.Focused("Queen") {
+		t.Fatal("Right did not reach the only shown child")
+	}
+}
+
+// pixel reads the light theme color at (x, y) of the last frame.
+func pixel(tt *ui.Tester, x, y float32) color.RGBA {
+	return tt.Image().RGBAAt(int(x), int(y))
+}
+
+func TestSelectChosenRowHasSelectionFill(t *testing.T) {
+	v, changes := "banana", 0
+	tt := selectTester(&v, selectTestOptions, SelectOptions{}, &changes)
+	tt.SetPreferences(ui.Preferences{ReduceMotion: true, TextScale: 1})
+	tt.Key(0, ui.KeyTab)
+	tt.Key(0, ui.KeyDown)
+	tt.Move(0, 0)
+	tt.Key(0, ui.KeyDown)
+	blue, ok := tt.Find("Blueberry")
+	if !ok {
+		t.Fatal("popup closed")
+	}
+	h := theme.Default.ControlHeight()
+	got := pixel(tt, blue.X+blue.W+20, blue.Y+blue.H/2-h)
+	s := theme.Light().Selection
+	if got.R != s.R || got.G != s.G || got.B != s.B {
+		t.Fatalf("chosen row %v, want selection %v", got, s)
+	}
+}
+
+func TestChoiceHitAreas(t *testing.T) {
+	v, changes := "apple", 0
+	tt := selectTester(&v, selectTestOptions, SelectOptions{Clearable: true}, &changes)
+	if r, _ := tt.Find("Clear"); r.W < theme.MinHitSize || r.H < theme.MinHitSize {
+		t.Errorf("clear button %v", r)
+	}
+	var sel []string
+	tt = treeSelectTester(&sel, TreeSelectOptions{}, &changes)
+	_ = tt.Click("Select…")
+	if r, _ := tt.Find("Expand Court"); r.W < theme.MinHitSize || r.H < theme.MinHitSize {
+		t.Errorf("tree arrow %v", r)
+	}
+	font := ""
+	tt = ui.NewTester(func(c *ui.Context) {
+		Use(c, Settings{})
+		Combobox(c, &font, comboboxTestFonts, ComboboxOptions{})
+	}, 400, 300)
+	if r, _ := tt.Find("Show options"); r.W < theme.MinHitSize || r.H < theme.MinHitSize {
+		t.Errorf("combobox arrow %v", r)
+	}
+}
+
+func TestChoiceRowsFollowDensity(t *testing.T) {
+	for _, d := range []theme.Density{theme.Compact, theme.Default, theme.Comfortable} {
+		v, on := "apple", false
+		var sw *ui.Element
+		tt := ui.NewTester(func(c *ui.Context) {
+			Use(c, Settings{Density: d})
+			ui.Column(c).Padding(10).AlignItems(ui.Start).Children(func() {
+				sw = Switch(c, &on, "Wi-Fi", SwitchOptions{})
+				Select(c, &v, selectTestOptions, SelectOptions{Label: "Fruit"})
+			})
+		}, 400, 500)
+		if h := sw.Bounds().H; h < d.ControlHeight() {
+			t.Errorf("%v: switch %v high", d, h)
+		}
+		_ = tt.Click("Fruit")
+		a, _ := tt.Find("Cherry")
+		b, _ := tt.Find("Date")
+		if b.Y-a.Y < d.ControlHeight() {
+			t.Errorf("%v: option rows %v apart", d, b.Y-a.Y)
+		}
+	}
+}
+
+func TestMultiSelectCaptionFollowsTextScale(t *testing.T) {
+	height := func(scale float32) float32 {
+		values := []int{1}
+		tt := multiSelectTester(&values, MultiSelectOptions{Max: 2}, new(int))
+		tt.SetPreferences(ui.Preferences{TextScale: scale})
+		_ = tt.Click("Rose")
+		r, ok := tt.Find("1 of 2 chosen")
+		if !ok {
+			t.Fatal("limit note missing")
+		}
+		return r.H
+	}
+	if one, two := height(1), height(2); two < one*1.5 {
+		t.Fatalf("caption %v high at 2x, %v at 1x", two, one)
+	}
+}
+
+func TestComboboxCaretAfterChoice(t *testing.T) {
+	r := &comboboxRun{}
+	tt := comboboxTester(r, fixedFonts, ComboboxOptions{})
+	tt.Key(0, ui.KeyTab)
+	tt.Type("di")
+	tt.Key(0, ui.KeyEnter)
+	if r.value != "Didot" {
+		t.Fatalf("value %q", r.value)
+	}
+	tt.Type("x")
+	if r.query != "Didotx" {
+		t.Fatalf("typing after a choice gave %q", r.query)
+	}
+}
+
+// The first Tab enters a toggle group at its first enabled item; later at the last focused one.
+func TestToggleGroupTabEntry(t *testing.T) {
+	value := []string{"right"}
+	tt := choiceBetween(func(c *ui.Context) {
+		ToggleGroup(c, &value, toggleGroupTestItems, ToggleGroupOptions{})
+	})
+	_ = tt.Click("Before")
+	tt.Key(0, ui.KeyTab)
+	if !tt.Focused("Left") {
+		t.Fatal("first Tab did not land on the first item")
+	}
+	tt.Key(0, ui.KeyRight)
+	tt.Key(0, ui.KeyTab)
+	_ = tt.Click("Before")
+	tt.Key(0, ui.KeyTab)
+	if !tt.Focused("Center") {
+		t.Fatal("Tab did not return to the last focused item")
+	}
+}

combobox.go

@@ -41,9 +41,7 @@ func (r ComboboxResult) QueryChanged() bool { return r.queryChanged }
 // comboboxKey keeps this file's state apart from MyGo's own.
 type comboboxKey struct{ name string }
 
-// Combobox chooses *value by typing to filter options and picking one, as
-// an autocomplete does. Up and Down move, Enter or a click chooses, Escape
-// closes. With AllowCustom, Enter or leaving the field keeps typed text.
+// Combobox chooses *value by typing to filter options and picking one, or typed text with AllowCustom.
 func Combobox(c *ui.Context, value *string, options []string, opts ComboboxOptions) ComboboxResult {
 	k := Tokens(c)
 	d := Density(c)
@@ -52,9 +50,21 @@ func Combobox(c *ui.Context, value *string, options []string, opts ComboboxOptio
 		Gap(d.Unit() * 2).Radius(theme.ControlRadius).Background(k.Surface).Cursor(ui.CursorText).Disabled(opts.Disabled)
 	query := ui.Local(f, comboboxKey{"query"}, func() string { return *value })
 	wasFocused := ui.Local(f, comboboxKey{"focused"}, func() bool { return false })
+	// MyGo keeps the caret on replaced text (ui/editor.go:117): a choice builds a fresh input.
+	gen := ui.Local(f, comboboxKey{"input"}, func() int { return 0 })
+	refocus := ui.Local(f, comboboxKey{"refocus"}, func() bool { return false })
 	var p *ui.ComboboxParts
 	f.Children(func() {
-		p = ui.ComboboxBase(c, query)
+		ui.Row(c).Key(*gen).Grow(1).Children(func() {
+			p = ui.ComboboxBase(c, choiceTarget(query, opts.Disabled))
+		})
+		if *refocus {
+			p.Input.Focus()
+			*refocus = false
+		}
+		if opts.Disabled {
+			p.SetOpen(false)
+		}
 		pad := max(0, (d.ControlHeight()-2-theme.BodySize*theme.LineHeight)/2)
 		p.Input.Grow(1).MinWidth(80).Padding(pad, d.Unit()*3).Placeholder(opts.Placeholder)
 		if opts.Label != "" {
@@ -63,13 +73,16 @@ func Combobox(c *ui.Context, value *string, options []string, opts ComboboxOptio
 		if opts.Loading {
 			Spinner(c, SpinnerOptions{Size: 14})
 		}
-		arrow := ui.Box(c).Size(16, 16).Shrink(0).Cursor(ui.CursorPointer)
+		arrow := ui.Box(c).Size(theme.MinHitSize, theme.MinHitSize).Shrink(0).Cursor(ui.CursorPointer).
+			Role(ui.RoleButton).Label(msg(c, "combobox.toggle"))
 		if arrow.Clicked() {
 			p.SetOpen(!p.Open())
 			p.Input.Focus()
 		}
 		open := p.Open()
-		arrow.Draw(func(pt *ui.Painter, r ui.Rect) { internal.Mark(pt, r, selectChevron(open), k.TextMuted) })
+		arrow.Draw(func(pt *ui.Painter, r ui.Rect) {
+			internal.Mark(pt, selectCenter(r, 16), selectChevron(open), k.TextMuted)
+		})
 	})
 	in := p.Input
 	if f.Clicked() {
@@ -116,11 +129,13 @@ func Combobox(c *ui.Context, value *string, options []string, opts ComboboxOptio
 	focused := in.Focused()
 	if v, ok := p.Chosen(); ok {
 		*value, *query = v, v
+		*gen, *refocus = *gen+1, focused
 	} else if in.Submitted() && opts.AllowCustom {
 		*value = strings.TrimSpace(*query)
 	} else if in.Submitted() && p.Open() && len(shown) > 0 {
 		// Results came after typing left nothing highlighted: Enter takes the first.
 		*value, *query = shown[0], shown[0]
+		*gen, *refocus = *gen+1, true
 		p.SetOpen(false)
 	} else if *wasFocused && !focused {
 		if opts.AllowCustom {

docs/components/033-toggle-group.md

@@ -54,7 +54,7 @@ ui.Render(view, 400, 300, 1)
 
 ## 键盘操作
 
-- Tab：进入组，落在按下项（或上次聚焦项）；再按 Tab 离开。
+- Tab：进入组。首次落在第一个可用项（与哪项按下无关）；之后回到组内上次聚焦的项。再按 Tab 离开。
 - ←/→（纵向为 ↑/↓）、Home、End：在项之间移动焦点，跳过禁用项，首尾循环。
 - Space：按下或松开当前项。
 

docs/components/034-slider.md

@@ -25,7 +25,7 @@ ui.Render(view, 400, 300, 1)
 | `Step` | `float64` | 0 | 步长；值为 `Min + n·Step`。0 为连续。 |
 | `Marks` | `[]SliderMark` | nil | 刻度：`Value` 处画刻线，`Label` 非空时在下方显示文字。 |
 | `ShowValue` | `bool` | false | 悬停、拖动或聚焦时在滑块上方显示数值提示（预留高度，不改变布局）。 |
-| `Format` | `func(float64) string` | 按步长精度 | 数值文字。 |
+| `Format` | `func(float64) string` | 按 `Min`、`Step` 所需小数位（连续时至少 1 位） | 数值文字。 |
 | `Disabled` | `bool` | false | 禁用。 |
 | `Label` | `string` | "" | 无障碍名称。 |
 
@@ -44,5 +44,6 @@ ui.Render(view, 400, 300, 1)
 
 ## 限制
 
-- 基于 `ui.SliderBase`。MyGo 的方向键步长固定为范围的 1%（ui/base.go:116），本组件把每次按键结果换算为一个 `Step`；当 `Step` 小于范围的 1% 且滑块距端点不足 1% 时，方向键会直接到端点。
-- `SliderBase` 在构建时就处理指针（ui/base.go:111），禁用时组件改为让它操作副本，保证值不变。
+- 基于 `ui.SliderBase`，它向辅助技术报告 Slider 角色、范围与当前值（ui/base.go:128）。
+- MyGo 只把方向键、Home、End 交给 `SliderBase` 本身（ui/base.go:118，按键路由见 ui/input.go:495），并固定以范围的 1% 移动。本组件让它操作副本，按方向判断按键后自己按 `Step` 移动；距端点不足 1% 时 MyGo 的方向键与 Home/End 结果相同，组件改看松开的是哪个键（`HandleInput` 能收到 KeyUp），在键松开前不改值。
+- `SliderBase` 在构建时就处理指针（ui/base.go:111），禁用时外层先禁用，且只操作副本，保证值不变。

docs/components/035-range-slider.md

@@ -25,9 +25,9 @@ ui.Render(view, 400, 300, 1)
 | `Step` | `float64` | 0 | 步长，0 为连续。 |
 | `Marks` | `[]SliderMark` | nil | 刻度与文字。 |
 | `ShowValue` | `bool` | false | 悬停、拖动或聚焦时显示两端数值；低端提示向左、高端向右，互不遮挡。 |
-| `Format` | `func(float64) string` | 按步长精度 | 数值文字。 |
+| `Format` | `func(float64) string` | 按 `Min`、`Step` 所需小数位（连续时至少 1 位） | 数值文字。 |
 | `Disabled` | `bool` | false | 禁用。 |
-| `Label` | `string` | "" | 区间名称；两个滑块分别读作“`Label` 最小值, 20”“`Label` 最大值, 80”。 |
+| `Label` | `string` | "" | 区间名称；两个滑块分别名为“`Label` 最小值”“`Label` 最大值”，数值与范围由 Slider 角色报告。 |
 
 ## 状态
 
@@ -46,5 +46,6 @@ ui.Render(view, 400, 300, 1)
 
 ## 限制
 
-- MyGo 自带的 `ui.RangeSlider` 使用玻璃质感滑块（ui/widgets.go:419），不符合本库风格；MyGo 也没有双滑块 Base，故本组件用公开的 `Dragged`、`PointerPosition`、`Shortcut` 组合实现。
-- 滑块的无障碍角色为 Slider，但数值范围属性只能由 `SliderBase` 设置（ui/base.go:128），因此当前值写在名称里（如“Price 最小值, 20”），屏幕阅读器读名称而非数值属性。
+- MyGo 自带的 `ui.RangeSlider` 使用玻璃质感滑块（ui/widgets.go:419），不符合本库风格；MyGo 也没有双滑块 Base，故每个滑块各是一个 `SliderBase`（报告 Slider 角色、范围与当前值，ui/base.go:128），拖动由外层的 `Dragged`、`PointerPosition` 处理。
+- 两个滑块的范围都报告为整条轨道 `Min`–`Max`；“不能越过另一端”这一动态上下限无法告诉辅助技术。
+- 按键处理与 Slider 相同：距端点不足 1% 时等到按键松开再移动（见 034 限制）。

docs/components/036-select.md

@@ -36,7 +36,7 @@ ui.Render(view, 400, 300, 1)
 
 ## 状态
 
-默认、悬停（边框加深）、展开（酒红边框、箭头朝上）、聚焦、禁用；弹层中高亮项（浅底）、已选项（勾号 + 酒红文字）、禁用项、空状态。
+默认、悬停（边框加深）、展开（酒红边框、箭头朝上）、聚焦、禁用；弹层中高亮项（浅底）、已选项（玫瑰底 + 勾号 + 酒红文字）、键盘高亮项另有左侧竖条、禁用项、空状态。
 
 ## 事件
 
@@ -52,4 +52,5 @@ ui.Render(view, 400, 300, 1)
 ## 限制
 
 - 基于 `ui.SelectBase`。其高亮索引没有公开的设置接口（ui/base.go:260），所以弹层打开时输入字母不移动高亮，只在弹层关闭时定位。
-- 清空按钮不占 Tab 位（与 MyGo 搜索框一致），键盘用 Backspace/Delete 清空。
+- 清空按钮不占 Tab 位（与 MyGo 搜索框一致），键盘用 Backspace/Delete 清空；它的命中区域为 28×28 DIP。
+- 选项行的角色为 ListItem，选中状态由 `SelectBase.Item` 报告。`SelectParts` 没有关闭弹层的接口（ui/base.go:310），所以选择器在弹层打开时被禁用后不再构建弹层；重新启用时弹层会再次显示。

docs/components/037-multi-select.md

@@ -49,6 +49,6 @@ ui.Render(view, 400, 300, 1)
 
 ## 限制
 
-- 选项行基于 `ui.CheckboxBase` 自绘方框；全选的“半选”只在画面上表示，MyGo 没有为自定义元素设置 mixed 状态的公开接口（ui/element.go:282 的 checked 字段仅由内部设置），屏幕阅读器读作未选中。
+- 选项行基于 `ui.CheckboxBase` 自绘方框，选中状态由 MyGo 报告。全选的“半选”无法作为 mixed 状态报告：MyGo 没有为自定义元素设置它的公开接口（ui/element.go:282 的 checked 字段仅由内部设置）。组件改用 `Description` 读出“部分选中”，屏幕阅读器仍把复选框本身读作未选中。
 - 标签上的移除按钮不占 Tab 位，键盘用 Backspace 移除。
 - 列表未虚拟化，适合数百项以内。

docs/components/038-combobox.md

@@ -53,3 +53,4 @@ ui.Render(view, 400, 300, 1)
 
 - 基于 `ui.ComboboxBase`。它在没有选项时隐藏弹层（ui/combobox.go:191），所以“加载中”“无匹配”用一个不接收输入的独立浮层显示。
 - 异步结果在打字后才到达时 MyGo 不会自动高亮首项，组件让 Enter 选择首个结果。
+- MyGo 替换输入框文字时保留原光标位置（ui/editor.go:117），且不公开光标设置；组件在选择后重建输入框，使光标落在新文字末尾并保持焦点。

docs/components/039-cascader.md

@@ -58,3 +58,4 @@ ui.Render(view, 400, 300, 1)
 
 - `Load` 在视图构建中同步调用，不得阻塞；异步任务完成后请用 `Window.Update` 回到界面线程更新数据。
 - 列表未虚拟化，每列适合数百项以内。
+- 已选路径上的节点通过 `Selected` 报告选中；当前展开的分支无法报告 expanded 状态（ui/base.go:297 等处仅内部设置），仅在画面上用底色表示。

docs/components/040-tree-select.md

@@ -55,5 +55,6 @@ ui.Render(view, 400, 300, 1)
 ## 限制
 
 - 树行基于 `ui.CheckboxBase` / `ui.ButtonBase` 自绘。MyGo 的 `TreeItem` 只能显示文字标签，无法放入复选框（ui/tree.go:44），故未复用。
-- 展开状态与半选状态只在画面上表示：MyGo 不对自定义元素公开 expanded 与 mixed 的设置（ui/base.go:297、ui/element.go:282 仅内部设置），屏幕阅读器读不到这两个状态；展开箭头带“展开/收起 + 节点名”的名称。
+- MyGo 不对自定义元素公开 expanded 与 mixed 状态的设置（ui/tree.go:98、ui/element.go:282 仅内部设置）。组件改用 `Description` 读出“已展开/已收起”“部分选中”，展开箭头带“展开/收起 + 节点名”的名称；屏幕阅读器读不到真正的 expanded/mixed 状态属性。单选行通过 `Selected` 报告选中，并显示勾号。
+- `CollapsibleBase` 的触发器能报告 expanded，但它自身要占一个焦点位，会让方向键在箭头与节点间交替停留，故未采用。
 - 列表未虚拟化，适合数千节点以内。

examples/gallery/pages_choice.go

@@ -105,10 +105,10 @@ view := func(c *ui.Context) {
 func choiceDemo(c *ui.Context, controls, samples func()) {
 	k := mujica.Tokens(c)
 	ui.Column(c).Gap(20).AlignItems(ui.Start).Children(func() {
-		ui.Text(c, "Parameters").Font(theme.SerifFont).FontSize(theme.H3Size).TextColor(k.Text)
+		ui.Text(c, "Parameters").Font(theme.SerifFont).FontSize(mujica.FontSize(c, theme.H3Size)).TextColor(k.Text)
 		ui.Row(c).Gap(20).Wrap().AlignItems(ui.Center).Children(controls)
 		ui.Box(c).Height(1).FillWidth().Background(k.Ornament)
-		ui.Text(c, "States").Font(theme.SerifFont).FontSize(theme.H3Size).TextColor(k.Text)
+		ui.Text(c, "States").Font(theme.SerifFont).FontSize(mujica.FontSize(c, theme.H3Size)).TextColor(k.Text)
 		ui.Column(c).Gap(16).AlignItems(ui.Start).Children(samples)
 	})
 }
@@ -123,7 +123,7 @@ func choiceFlag(c *ui.Context, on *bool, label string, log func(string)) {
 // choiceLabeled shows a caption above a sample.
 func choiceLabeled(c *ui.Context, caption string, fn func()) {
 	ui.Column(c).Gap(6).Children(func() {
-		ui.Text(c, caption).FontSize(theme.CaptionSize).TextColor(mujica.Tokens(c).TextMuted)
+		ui.Text(c, caption).FontSize(mujica.FontSize(c, theme.CaptionSize)).TextColor(mujica.Tokens(c).TextMuted)
 		fn()
 	})
 }
@@ -288,7 +288,7 @@ var choiceFruits = []mujica.SelectOption[string]{
 
 func selectDemo(c *ui.Context, log func(string)) {
 	type state struct {
-		value                       string
+		value, picked               string
 		clearable, disabled, noData bool
 	}
 	s := *ui.Local(c.Root(), "036", func() *state { return &state{value: "banana", clearable: true} })
@@ -306,9 +306,10 @@ func selectDemo(c *ui.Context, log func(string)) {
 				log(fmt.Sprintf("Fruit: %q", s.value))
 			}
 		})
-		empty := ""
 		choiceLabeled(c, "Placeholder", func() {
-			mujica.Select(c, &empty, choiceFruits, mujica.SelectOptions{Placeholder: "Pick a fruit"})
+			if mujica.Select(c, &s.picked, choiceFruits, mujica.SelectOptions{Placeholder: "Pick a fruit", Clearable: true}).Changed() {
+				log(fmt.Sprintf("Picked: %q", s.picked))
+			}
 		})
 	})
 }

examples/gallery/pages_choice_test.go

@@ -0,0 +1,57 @@
+package main
+
+import (
+	"slices"
+	"testing"
+
+	"github.com/egoist/mygo/ui"
+
+	mujica "mujicaui"
+)
+
+// choiceDemoTester runs the demo of page id at text scale and returns its tester and event log.
+func choiceDemoTester(t *testing.T, id string, scale float32) (*ui.Tester, *[]string) {
+	t.Helper()
+	i := slices.IndexFunc(choicePages, func(p page) bool { return p.ID == id })
+	if i < 0 {
+		t.Fatalf("no page %s", id)
+	}
+	events := &[]string{}
+	tt := ui.NewTester(func(c *ui.Context) {
+		mujica.Use(c, mujica.Settings{Mode: mujica.Light})
+		ui.Scroll(c).Fill().Padding(24).Children(func() {
+			choicePages[i].Demo(c, func(s string) { *events = append(*events, s) })
+		})
+	}, 900, 700)
+	tt.SetPreferences(ui.Preferences{ReduceMotion: true, TextScale: scale})
+	return tt, events
+}
+
+func TestChoiceSelectDemoKeepsPlaceholderChoice(t *testing.T) {
+	tt, events := choiceDemoTester(t, "036", 1)
+	if err := tt.Click("Pick a fruit"); err != nil {
+		t.Fatal(err)
+	}
+	if err := tt.Click("Fig"); err != nil {
+		t.Fatal(err)
+	}
+	tt.Frame()
+	if !tt.HasText("Fig") || !slices.Contains(*events, `Picked: "fig"`) {
+		t.Fatalf("choice lost: texts %q, events %q", tt.Texts(), *events)
+	}
+}
+
+func TestChoiceDemoHeadingsFollowTextScale(t *testing.T) {
+	height := func(scale float32) float32 {
+		tt, _ := choiceDemoTester(t, "031", scale)
+		tt.Frame()
+		r, ok := tt.Find("Parameters")
+		if !ok {
+			t.Fatal("heading missing")
+		}
+		return r.H
+	}
+	if one, two := height(1), height(2); two < one*1.5 {
+		t.Fatalf("heading %v high at 2x, %v at 1x", two, one)
+	}
+}

internal/choice.go

@@ -36,12 +36,11 @@ func CheckBox(p *ui.Painter, r ui.Rect, s CheckState, k theme.Tokens, hover bool
 	if s == Mixed {
 		mark = "minus"
 	}
-	Mark(p, r, mark, k.OnAccent)
+	in := r.W * 0.12
+	Mark(p, ui.Rect{X: r.X + in, Y: r.Y + in, W: r.W - 2*in, H: r.H - 2*in}, mark, k.OnAccent)
 }
 
-// Mark paints the Lucide icon name inset in r. Icons sit on the pixel grid,
-// so their cached masks never differ between frames or tests.
+// Mark paints the Lucide icon name in r, on the pixel grid so masks never vary.
 func Mark(p *ui.Painter, r ui.Rect, name string, c ui.Color) {
-	in := r.W * 0.12
-	p.Icon(icons.Must(name), ui.Rect{X: r.X + in, Y: r.Y + in, W: r.W - 2*in, H: r.H - 2*in}, c)
+	p.Icon(icons.Must(name), r, c)
 }

messages_choice.go

@@ -13,6 +13,7 @@ func init() {
 		"multi_select.limit":      {"%d of %d chosen", "已选 %d / %d"},
 		"multi_select.more":       {"+%d", "+%d"},
 		"multi_select.remove":     {"Remove %s", "移除 %s"},
+		"combobox.toggle":         {"Show options", "显示选项"},
 		"combobox.loading":        {"Loading…", "加载中…"},
 		"combobox.no_results":     {"No matches", "无匹配项"},
 		"combobox.use":            {"Use “%s”", "使用“%s”"},
@@ -24,5 +25,9 @@ func init() {
 		"tree_select.no_results":  {"No results", "无匹配结果"},
 		"tree_select.expand":      {"Expand %s", "展开 %s"},
 		"tree_select.collapse":    {"Collapse %s", "收起 %s"},
+		"tree_select.expanded":    {"expanded", "已展开"},
+		"tree_select.collapsed":   {"collapsed", "已收起"},
+		"tree_select.mixed":       {"partly selected", "部分选中"},
+		"multi_select.mixed":      {"partly selected", "部分选中"},
 	})
 }

multi_select.go

@@ -28,9 +28,7 @@ type MultiSelectOptions struct {
 // multiSelectKey keeps this file's state apart from MyGo's own.
 type multiSelectKey struct{ name string }
 
-// MultiSelect chooses several *values from options in a popup with a
-// search field, "Select all" for the matches, and an optional limit.
-// Down from the search moves into the list; Space checks; Escape closes.
+// MultiSelect chooses several *values from options in a popup with search and "Select all".
 func MultiSelect[T comparable](c *ui.Context, values *[]T, options []SelectOption[T], opts MultiSelectOptions) ChoiceResult {
 	if opts.Max < 0 || opts.MaxTags < 0 {
 		panic("mujica: MultiSelect Max and MaxTags must not be negative")
@@ -42,6 +40,9 @@ func MultiSelect[T comparable](c *ui.Context, values *[]T, options []SelectOptio
 		tr.Label(opts.Label)
 	}
 	open := ui.Local(tr, multiSelectKey{"open"}, func() bool { return false })
+	if opts.Disabled {
+		*open = false
+	}
 	query := ui.Local(tr, multiSelectKey{"query"}, func() string { return "" })
 	if tr.Clicked() || (!*open && tr.Shortcut(0, ui.KeyDown)) {
 		*open = !*open
@@ -100,7 +101,7 @@ func multiSelectTag(c *ui.Context, label string, disabled bool) bool {
 	removed := false
 	ui.Row(c).Gap(2).Padding(1, 2, 1, 6).Radius(theme.ControlRadius).Background(k.Selection).
 		Border(theme.BorderWidth, k.Border).Shrink(0).Children(func() {
-		ui.Text(c, label).FontSize(theme.CaptionSize).TextColor(k.Text).SingleLine()
+		ui.Text(c, label).FontSize(FontSize(c, theme.CaptionSize)).TextColor(k.Text).SingleLine()
 		if !disabled {
 			removed = selectClear(c, k, fmt.Sprintf(msg(c, "multi_select.remove"), label))
 		}
@@ -170,7 +171,7 @@ func multiSelectPopup[T comparable](c *ui.Context, k theme.Tokens, values *[]T,
 		})
 		if opts.Max > 0 {
 			ui.Text(c, fmt.Sprintf(msg(c, "multi_select.limit"), len(*values), opts.Max)).
-				FontSize(theme.CaptionSize).TextColor(k.TextMuted).Padding(2, d.Unit()*2)
+				FontSize(FontSize(c, theme.CaptionSize)).TextColor(k.TextMuted).Padding(2, d.Unit()*2)
 		}
 	})
 }
@@ -178,12 +179,16 @@ func multiSelectPopup[T comparable](c *ui.Context, k theme.Tokens, values *[]T,
 // multiSelectCheck is a CheckboxBase row drawing its own box.
 func multiSelectCheck(c *ui.Context, k theme.Tokens, on *bool, st internal.CheckState, label string, disabled bool) *ui.Element {
 	d := Density(c)
-	scratch := *on
-	if disabled {
-		on = &scratch
+	var cb *ui.Element
+	// A disabled wrapper and a copy block the base, which toggles as it is built.
+	ui.Row(c).Grow(1).Disabled(disabled).Children(func() {
+		cb = ui.CheckboxBase(c, choiceTarget(on, disabled)).MinHeight(d.ControlHeight()).Padding(0, d.Unit()*2).
+			Gap(d.Unit() * 2).AlignItems(ui.Center).Radius(theme.ControlRadius).Grow(1)
+	})
+	if st == internal.Mixed {
+		// MyGo sets the mixed state only inside its own widgets (ui/element.go:282).
+		cb.Description(msg(c, "multi_select.mixed"))
 	}
-	cb := ui.CheckboxBase(c, on).Disabled(disabled).MinHeight(d.ControlHeight()-4).Padding(0, d.Unit()*2).
-		Gap(d.Unit() * 2).AlignItems(ui.Center).Radius(theme.ControlRadius).Grow(1)
 	internal.Ring(cb, k.Focus, theme.ControlRadius)
 	hover := cb.Hovered()
 	if hover {

range_slider.go

@@ -22,11 +22,11 @@ type RangeSliderOptions struct {
 	Label string
 }
 
-// RangeSlider sets *low and *high, which never cross. A press moves the
-// nearer thumb; each thumb takes the focus and the arrows, Home and End.
+// RangeSlider sets *low and *high, which never cross; a press moves the nearer thumb, each takes the keys.
 func RangeSlider(c *ui.Context, low, high *float64, opts RangeSliderOptions) ChoiceResult {
 	g, h := sliderSetup(opts.Min, opts.Max, opts.Step, opts.Marks, opts.ShowValue, c)
-	format := sliderFormat(opts.Format, opts.Step)
+	format := sliderFormat(opts.Format, g)
+	size := FontSize(c, theme.CaptionSize)
 	k := Tokens(c)
 	*low, *high = g.snap(math.Min(*low, *high)), g.snap(math.Max(*low, *high))
 	oldLow, oldHigh := *low, *high
@@ -47,32 +47,24 @@ func RangeSlider(c *ui.Context, low, high *float64, opts RangeSliderOptions) Cho
 				from, to = *low, g.hi
 			}
 			x := g.x(ui.Rect{W: r.W}, *v) - sliderThumb/2
-			kb := ui.Box(c).Key(i).Absolute().Left(x).Top(g.trackY-sliderThumb/2).Size(sliderThumb, sliderThumb).
-				Focusable().FocusRing(false).Role(ui.RoleSlider)
+			var kb *ui.Element
+			var next float64
+			var held bool
+			// Each thumb is a SliderBase, which reports the range and value to assistive technology.
+			ui.Box(c).Key(i).Absolute().Left(x).Top(g.trackY-sliderThumb/2).Size(sliderThumb, sliderThumb).Children(func() {
+				kb, next, held = sliderControl(c, *v, g, from, to)
+			})
+			kb.Size(sliderThumb, sliderThumb).FocusRing(false)
 			name := msg(c, []string{"range_slider.min", "range_slider.max"}[i])
 			if opts.Label != "" {
 				name = opts.Label + " " + name
 			}
-			kb.Label(name + ", " + format(*v))
-			step := func(d float64) float64 {
-				if g.step > 0 {
-					return g.snap(*v + d*g.step)
-				}
-				return *v + d*(g.hi-g.lo)/100
-			}
-			switch {
-			case kb.Shortcut(0, ui.KeyLeft), kb.Shortcut(0, ui.KeyDown):
-				*v = max(from, step(-1))
-			case kb.Shortcut(0, ui.KeyRight), kb.Shortcut(0, ui.KeyUp):
-				*v = min(to, step(1))
-			case kb.Shortcut(0, ui.KeyHome):
-				*v = from
-			case kb.Shortcut(0, ui.KeyEnd):
-				*v = to
-			}
-			if _, _, ok := kb.Dragged(); ok {
+			kb.Label(name)
+			if held {
 				pressed = true
 				*drag = i
+			} else if !opts.Disabled {
+				*v = next
 			}
 			knobs[i] = kb
 		}
@@ -104,12 +96,12 @@ func RangeSlider(c *ui.Context, low, high *float64, opts RangeSliderOptions) Cho
 	hover := e.Hovered()
 	e.Draw(func(p *ui.Painter, r ui.Rect) {
 		x0, x1 := g.x(r, lo), g.x(r, hi)
-		sliderTrackPaint(p, r, g, k, opts.Marks, format, x0, x1)
+		sliderTrackPaint(p, r, g, k, opts.Marks, size, x0, x1)
 		for i, x := range []float32{x0, x1} {
 			hot := which == i || knobs[i].Hovered()
 			sliderThumbPaint(p, k, x, r.Y+g.trackY, hot, knobs[i].FocusVisible())
 			if opts.ShowValue && (hot || hover || knobs[i].Focused()) {
-				rangeSliderBubble(p, k, x, r.Y+g.trackY, format([]float64{lo, hi}[i]), i)
+				rangeSliderBubble(p, k, x, r.Y+g.trackY, format([]float64{lo, hi}[i]), i, size)
 			}
 		}
 	})
@@ -120,11 +112,11 @@ func RangeSlider(c *ui.Context, low, high *float64, opts RangeSliderOptions) Cho
 type rangeSliderDrag struct{}
 
 // rangeSliderBubble keeps the two tips apart: the low one leans left, the high one right.
-func rangeSliderBubble(p *ui.Painter, k theme.Tokens, x, y float32, s string, i int) {
-	w, _ := p.MeasureText(1000, ui.Span{Text: s, Size: theme.CaptionSize})
+func rangeSliderBubble(p *ui.Painter, k theme.Tokens, x, y float32, s string, i int, size float32) {
+	w, _ := p.MeasureText(1000, ui.Span{Text: s, Size: size})
 	shift := (w+12)/2 - sliderThumb/2
 	if i == 0 {
 		shift = -shift
 	}
-	sliderBubblePaint(p, k, x+shift, y, s)
+	sliderBubblePaint(p, k, x+shift, y, s, size)
 }

range_slider_test.go

@@ -21,7 +21,7 @@ func TestRangeSliderKeysPerThumb(t *testing.T) {
 	low, high, changes := 20.0, 80.0, 0
 	tt := rangeTester(&low, &high, RangeSliderOptions{Step: 10, Label: "Price"}, &changes)
 	tt.Key(0, ui.KeyTab)
-	if !tt.Focused("Price minimum, 20") {
+	if !tt.Focused("Price minimum") {
 		t.Fatal("first Tab did not focus the low thumb")
 	}
 	tt.Key(0, ui.KeyRight)
@@ -37,7 +37,7 @@ func TestRangeSliderKeysPerThumb(t *testing.T) {
 		t.Fatalf("low crossed high: %v", low)
 	}
 	tt.Key(0, ui.KeyTab)
-	if !tt.Focused("Price maximum, 80") {
+	if !tt.Focused("Price maximum") {
 		t.Fatal("second Tab did not focus the high thumb")
 	}
 	tt.Key(0, ui.KeyLeft)
@@ -77,18 +77,6 @@ func TestRangeSliderOrdersSwappedEnds(t *testing.T) {
 	}
 }
 
-func TestRangeSliderDisabled(t *testing.T) {
-	low, high, changes := 20.0, 40.0, 0
-	tt := rangeTester(&low, &high, RangeSliderOptions{Disabled: true}, &changes)
-	tt.Key(0, ui.KeyTab)
-	tt.Key(0, ui.KeyRight)
-	tt.Press(150, 18)
-	tt.Release(150, 18)
-	if low != 20 || high != 40 || changes != 0 {
-		t.Fatalf("disabled moved: %v..%v", low, high)
-	}
-}
-
 func TestRangeSliderSnapshot(t *testing.T) {
 	snapshot(t, "range_slider", 420, 170, func(c *ui.Context) {
 		a, b := 20.0, 70.0

select.go

@@ -41,19 +41,15 @@ type selectTypeahead struct {
 	at      time.Time
 }
 
-// Select chooses *value from options in a popup. Enter, Space and the
-// arrows open it; the arrows, Home and End move; Enter chooses; Escape
-// closes. Typing on the closed select chooses the option starting with it.
+// Select chooses *value from options in a popup; typing on the closed select jumps to a match.
 func Select[T comparable](c *ui.Context, value *T, options []SelectOption[T], opts SelectOptions) ChoiceResult {
 	k := Tokens(c)
 	old := *value
-	if opts.Disabled {
-		// SelectBase takes clicks as it is built: a disabled one works on a copy.
-		scratch := old
-		value = &scratch
-	}
-	s := ui.SelectBase(c, value)
-	tr := s.Trigger.Disabled(opts.Disabled)
+	value = choiceTarget(value, opts.Disabled)
+	var s *ui.SelectParts[T]
+	// SelectBase takes clicks as it is built: a disabled wrapper and a copy block them.
+	ui.Row(c).Shrink(0).Disabled(opts.Disabled).Children(func() { s = ui.SelectBase(c, value) })
+	tr := s.Trigger
 	if opts.Label != "" {
 		tr.Label(opts.Label)
 	}
@@ -93,6 +89,10 @@ func Select[T comparable](c *ui.Context, value *T, options []SelectOption[T], op
 		}
 	})
 	lastHi := ui.Local(tr, selectKey{"shown"}, func() int { return -1 })
+	if opts.Disabled {
+		// SelectParts has no way to close it (ui/base.go:310): a disabled select builds no popup.
+		return ChoiceResult{tr, false}
+	}
 	s.Popup(func(panel *ui.Element) {
 		selectPanel(c, panel)
 		ui.Scroll(c).MaxHeight(280).Children(func() {
@@ -191,17 +191,33 @@ func selectChevron(open bool) string {
 	return "chevron-down"
 }
 
-// selectClear draws a small clear button that takes no Tab stop; it reports a click.
+// selectClear draws a clear cross outside the Tab order, hit area 28 DIP laid out as 18; it reports a click.
 func selectClear(c *ui.Context, k theme.Tokens, name string) bool {
-	x := ui.Box(c).Size(18, 18).Shrink(0).Radius(theme.ControlRadius).Role(ui.RoleButton).Label(name)
+	x := ui.Box(c).Size(theme.MinHitSize, theme.MinHitSize).Margin(-5).Shrink(0).Radius(theme.ControlRadius).
+		Role(ui.RoleButton).Label(name).Cursor(ui.CursorPointer)
 	clicked := x.Clicked()
 	if x.Hovered() {
 		x.Background(k.SurfaceHover)
 	}
-	x.Draw(func(p *ui.Painter, r ui.Rect) { internal.Mark(p, r, "x", k.TextMuted) })
+	x.Draw(func(p *ui.Painter, r ui.Rect) { internal.Mark(p, selectCenter(r, 14), "x", k.TextMuted) })
 	return clicked
 }
 
+// selectCenter returns the size×size square centered in r.
+func selectCenter(r ui.Rect, size float32) ui.Rect {
+	return ui.Rect{X: r.X + (r.W-size)/2, Y: r.Y + (r.H-size)/2, W: size, H: size}
+}
+
+// selectCheck reserves room for the chosen mark and draws it when on.
+func selectCheck(c *ui.Context, on bool) {
+	k := Tokens(c)
+	ui.Box(c).Size(16, 16).Shrink(0).Draw(func(p *ui.Painter, r ui.Rect) {
+		if on {
+			internal.Mark(p, r, "check", k.AccentText)
+		}
+	})
+}
+
 // selectPanel styles a popup panel.
 func selectPanel(c *ui.Context, panel *ui.Element) {
 	k := Tokens(c)
@@ -209,24 +225,25 @@ func selectPanel(c *ui.Context, panel *ui.Element) {
 		Border(theme.BorderWidth, k.Border).Shadow(0, 4, 12, 0, ui.RGBA(0, 0, 0, 0.14))
 }
 
-// selectRow styles an option row: highlight background, check mark when chosen.
+// selectRow styles an option row: chosen has the selection fill and a check, highlighted a side bar.
 func selectRow(c *ui.Context, row *ui.Element, highlighted, chosen bool, label string) {
 	k := Tokens(c)
 	d := Density(c)
-	row.MinHeight(d.ControlHeight()-4).Padding(0, d.Unit()*3, 0, d.Unit()*2).Gap(d.Unit() * 2).
-		AlignItems(ui.Center).Radius(theme.ControlRadius)
-	if highlighted {
+	row.MinHeight(d.ControlHeight()).Padding(0, d.Unit()*3, 0, d.Unit()*2).Gap(d.Unit() * 2).
+		AlignItems(ui.Center).Radius(theme.ControlRadius).Role(ui.RoleListItem)
+	switch {
+	case chosen:
+		row.Background(k.Selection).TextColor(k.AccentText)
+	case highlighted:
 		row.Background(k.SurfaceHover)
 	}
-	if chosen {
-		row.TextColor(k.AccentText)
+	if highlighted {
+		row.Draw(func(p *ui.Painter, r ui.Rect) {
+			p.Fill(ui.Rect{X: r.X, Y: r.Y + 4, W: 2, H: r.H - 8}, k.AccentText, 1)
+		})
 	}
 	row.Children(func() {
-		ui.Box(c).Size(14, 14).Shrink(0).Draw(func(p *ui.Painter, r ui.Rect) {
-			if chosen {
-				internal.Mark(p, r, "check", k.AccentText)
-			}
-		})
+		selectCheck(c, chosen)
 		ui.Text(c, label).SingleLine()
 	})
 }

slider.go

@@ -4,6 +4,7 @@ import (
 	"log/slog"
 	"math"
 	"strconv"
+	"strings"
 
 	"github.com/egoist/mygo/ui"
 
@@ -25,7 +26,7 @@ type SliderOptions struct {
 	Marks []SliderMark
 	// ShowValue shows the value above the thumb while hovered, dragged or focused.
 	ShowValue bool
-	// Format writes the value; nil prints it with the step's precision.
+	// Format writes the value; nil prints as many decimals as Min and Step need.
 	Format   func(float64) string
 	Disabled bool
 	// Label names the slider for assistive technology.
@@ -63,20 +64,67 @@ func (g sliderGeom) snap(v float64) float64 {
 	return math.Round(v*1e9) / 1e9
 }
 
-// keyed returns the value after a key moved old to raw, MyGo's 1% key step,
-// as one step of the slider: Home and End land on the ends.
-func (g sliderGeom) keyed(old, raw float64) float64 {
-	switch {
-	case g.step <= 0:
-		return raw
-	case raw == g.lo:
-		return g.lo
-	case raw == g.hi:
-		return g.snap(g.hi)
-	case raw > old:
-		return g.snap(min(g.hi, old+g.step))
+// sliderKey is the last key released on a slider, and a move waiting for it.
+type sliderKey struct {
+	up      ui.Key
+	pending int
+}
+
+type sliderKeyID struct{}
+
+// sliderControl builds a SliderBase on a copy of v and returns where the pointer or a key moves v.
+func sliderControl(c *ui.Context, v float64, g sliderGeom, from, to float64) (s *ui.Element, next float64, dragged bool) {
+	raw := v
+	s = ui.SliderBase(c, &raw, g.lo, g.hi)
+	ks := *ui.Local(s, sliderKeyID{}, func() *sliderKey { return &sliderKey{} })
+	// MyGo gives key downs to the base alone (ui/base.go:118); releases still reach this handler.
+	s.HandleInput(func(ev ui.InputEvent) bool {
+		if ev.Kind != ui.InputKeyUp {
+			return false
+		}
+		ks.up = ev.Key
+		return true
+	})
+	up, dir := ks.up, ks.pending
+	ks.up, ks.pending = 0, 0
+	if _, _, dragged = s.Dragged(); dragged {
+		return s, max(from, min(to, g.snap(raw))), true
 	}
-	return g.snap(old - g.step)
+	unsure := dir != 0
+	switch {
+	case raw < v:
+		dir, unsure = -1, false
+	case raw > v:
+		dir, unsure = 1, false
+	}
+	if dir == 0 {
+		return s, v, false
+	}
+	end, limit := g.lo, from
+	if dir > 0 {
+		end, limit = g.hi, to
+	}
+	jump := raw == end
+	// An arrow within 1% of an end lands on it too: the released key tells which it was.
+	if unsure || jump && math.Abs(v-end) <= (g.hi-g.lo)/100*(1+1e-9) {
+		switch up {
+		case ui.KeyHome, ui.KeyEnd:
+			jump = true
+		case ui.KeyLeft, ui.KeyRight, ui.KeyUp, ui.KeyDown:
+			jump = false
+		default:
+			ks.pending = dir
+			return s, v, false
+		}
+	}
+	if jump {
+		return s, limit, false
+	}
+	step := g.step
+	if step <= 0 {
+		step = (g.hi - g.lo) / 100
+	}
+	return s, max(from, min(to, g.snap(v+float64(dir)*step))), false
 }
 
 func sliderSetup(min, max, step float64, marks []SliderMark, showValue bool, c *ui.Context) (sliderGeom, float32) {
@@ -101,66 +149,70 @@ func sliderSetup(min, max, step float64, marks []SliderMark, showValue bool, c *
 	return g, h
 }
 
-func sliderFormat(format func(float64) string, step float64) func(float64) string {
+// sliderDecimals counts the decimals the shortest form of each value needs.
+func sliderDecimals(vs ...float64) int {
+	n := 0
+	for _, v := range vs {
+		s := strconv.FormatFloat(v, 'f', -1, 64)
+		if i := strings.IndexByte(s, '.'); i >= 0 {
+			n = max(n, len(s)-i-1)
+		}
+	}
+	return n
+}
+
+func sliderFormat(format func(float64) string, g sliderGeom) func(float64) string {
 	if format != nil {
 		return format
 	}
-	prec := 0
-	if step > 0 && step < 1 {
-		prec = int(math.Ceil(-math.Log10(step) - 1e-9))
-	} else if step == 0 {
-		prec = 1
+	prec := sliderDecimals(g.lo, g.step)
+	if g.step == 0 {
+		prec = max(prec, 1)
 	}
 	return func(v float64) string { return strconv.FormatFloat(v, 'f', prec, 64) }
 }
 
-// Slider sets *value between Min and Max by dragging anywhere on its box,
-// the arrows (one Step), Home and End. The thumb is a diamond; the hit area
-// is the whole rectangle.
+// Slider sets *value by dragging anywhere on its box, the arrows (one Step), Home and End.
 func Slider(c *ui.Context, value *float64, opts SliderOptions) ChoiceResult {
 	g, h := sliderSetup(opts.Min, opts.Max, opts.Step, opts.Marks, opts.ShowValue, c)
-	format := sliderFormat(opts.Format, opts.Step)
+	format := sliderFormat(opts.Format, g)
+	size := FontSize(c, theme.CaptionSize)
 	k := Tokens(c)
 	old := g.snap(*value)
 	*value = old
-	target := value
-	if opts.Disabled {
-		// SliderBase takes the pointer as it is built: a disabled one moves a copy.
-		scratch := old
-		target = &scratch
-	}
-	s := ui.SliderBase(c, target, g.lo, g.hi).Height(h).MinWidth(120).PaddingX(sliderThumb / 2).
-		FocusRing(false).Disabled(opts.Disabled).Cursor(ui.CursorPointer)
+	var s *ui.Element
+	var next float64
+	var held bool
+	// Disabled on a wrapper blocks the base before it takes input.
+	ui.Column(c).Disabled(opts.Disabled).Children(func() {
+		s, next, held = sliderControl(c, old, g, g.lo, g.hi)
+	})
+	s.Height(h).MinWidth(120).PaddingX(sliderThumb / 2).FocusRing(false).Cursor(ui.CursorPointer)
 	if opts.Label != "" {
 		s.Label(opts.Label)
 	}
-	if *value != old {
-		if _, _, drag := s.Dragged(); drag {
-			*value = g.snap(*value)
-		} else {
-			*value = g.keyed(old, *value)
-		}
+	if !opts.Disabled {
+		*value = next
 	}
 	changed := *value != old
 	if changed {
 		slog.Debug("mujica: slider changed", "label", opts.Label, "value", *value)
 	}
-	_, _, held := s.Dragged()
 	hover := s.Hovered()
 	v := *value
 	s.Draw(func(p *ui.Painter, r ui.Rect) {
-		sliderTrackPaint(p, r, g, k, opts.Marks, format, g.x(r, g.lo), g.x(r, v))
+		sliderTrackPaint(p, r, g, k, opts.Marks, size, g.x(r, g.lo), g.x(r, v))
 		x := g.x(r, v)
 		sliderThumbPaint(p, k, x, r.Y+g.trackY, hover || held, s.FocusVisible())
 		if opts.ShowValue && (hover || held || s.Focused()) {
-			sliderBubblePaint(p, k, x, r.Y+g.trackY, format(v))
+			sliderBubblePaint(p, k, x, r.Y+g.trackY, format(v), size)
 		}
 	})
 	return ChoiceResult{s, changed}
 }
 
 // sliderTrackPaint draws the rail, the filled part from x0 to x1, and the marks.
-func sliderTrackPaint(p *ui.Painter, r ui.Rect, g sliderGeom, k theme.Tokens, marks []SliderMark, format func(float64) string, x0, x1 float32) {
+func sliderTrackPaint(p *ui.Painter, r ui.Rect, g sliderGeom, k theme.Tokens, marks []SliderMark, size, x0, x1 float32) {
 	y := r.Y + g.trackY
 	left, right := g.x(r, g.lo), g.x(r, g.hi)
 	p.Fill(ui.Rect{X: left, Y: y - sliderTrack/2, W: right - left, H: sliderTrack}, k.Border, 0)
@@ -170,8 +222,8 @@ func sliderTrackPaint(p *ui.Painter, r ui.Rect, g sliderGeom, k theme.Tokens, ma
 		x := g.x(r, m.Value)
 		p.Fill(ui.Rect{X: x - 0.5, Y: y + sliderTrack/2 + 2, W: 1, H: 5}, k.TextMuted, 0)
 		if m.Label != "" {
-			w, _ := p.MeasureText(1000, ui.Span{Text: m.Label, Size: theme.CaptionSize})
-			p.Text(x-w/2, y+sliderTrack/2+8, m.Label, theme.CaptionSize, k.TextMuted)
+			w, _ := p.MeasureText(1000, ui.Span{Text: m.Label, Size: size})
+			p.Text(x-w/2, y+sliderTrack/2+8, m.Label, size, k.TextMuted)
 		}
 	}
 }
@@ -191,10 +243,10 @@ func sliderThumbPaint(p *ui.Painter, k theme.Tokens, x, y float32, hot, focus bo
 }
 
 // sliderBubblePaint draws the value tip above the thumb at (x, y).
-func sliderBubblePaint(p *ui.Painter, k theme.Tokens, x, y float32, s string) {
-	w, h := p.MeasureText(1000, ui.Span{Text: s, Size: theme.CaptionSize})
+func sliderBubblePaint(p *ui.Painter, k theme.Tokens, x, y float32, s string, size float32) {
+	w, h := p.MeasureText(1000, ui.Span{Text: s, Size: size})
 	b := ui.Rect{X: x - w/2 - 6, Y: y - sliderThumb/2 - h - 10, W: w + 12, H: h + 4}
 	p.Fill(b, k.Surface, theme.ControlRadius)
 	p.Stroke(b, k.ControlBorder, theme.ControlRadius, theme.BorderWidth)
-	p.Text(b.X+6, b.Y+2, s, theme.CaptionSize, k.Text)
+	p.Text(b.X+6, b.Y+2, s, size, k.Text)
 }

slider_keys_test.go

@@ -0,0 +1,83 @@
+package mujica
+
+import (
+	"bytes"
+	"testing"
+
+	"github.com/egoist/mygo/ui"
+)
+
+func TestSliderFineStepNearEnds(t *testing.T) {
+	v, changes := 99.2, 0
+	tt := sliderTester(&v, SliderOptions{Step: 0.1, Label: "Gain"}, &changes)
+	tt.Key(0, ui.KeyTab)
+	tt.Key(0, ui.KeyRight)
+	if v != 99.3 {
+		t.Fatalf("Right from 99.2: %v", v)
+	}
+	tt.Key(0, ui.KeyEnd)
+	if v != 100 {
+		t.Fatalf("End: %v", v)
+	}
+	v = 0.5
+	tt.Frame()
+	tt.Key(0, ui.KeyLeft)
+	if v != 0.4 {
+		t.Fatalf("Left from 0.5: %v", v)
+	}
+	tt.Key(0, ui.KeyHome)
+	if v != 0 {
+		t.Fatalf("Home: %v", v)
+	}
+}
+
+func TestRangeSliderFineStepNearEnds(t *testing.T) {
+	low, high, changes := 0.3, 99.8, 0
+	tt := rangeTester(&low, &high, RangeSliderOptions{Step: 0.1, Label: "Band"}, &changes)
+	tt.Key(0, ui.KeyTab)
+	tt.Key(0, ui.KeyLeft)
+	if low != 0.2 {
+		t.Fatalf("Left from 0.3: %v", low)
+	}
+	tt.Key(0, ui.KeyTab)
+	tt.Key(0, ui.KeyRight)
+	if high != 99.9 {
+		t.Fatalf("Right from 99.8: %v", high)
+	}
+}
+
+func TestSliderFormatKeepsStepDecimals(t *testing.T) {
+	for _, tc := range []struct {
+		g    sliderGeom
+		v    float64
+		want string
+	}{
+		{sliderGeom{lo: 0, hi: 1, step: 0.25}, 0.75, "0.75"},
+		{sliderGeom{lo: 0.5, hi: 10, step: 1}, 2.5, "2.5"},
+		{sliderGeom{lo: 0, hi: 100, step: 5}, 35, "35"},
+	} {
+		if got := sliderFormat(nil, tc.g)(tc.v); got != tc.want {
+			t.Errorf("%+v: %q, want %q", tc.g, got, tc.want)
+		}
+	}
+}
+
+func TestSliderMarksFollowTextScale(t *testing.T) {
+	render := func(scale float32) []byte {
+		v, low, high := 50.0, 20.0, 80.0
+		marks := []SliderMark{{Value: 0, Label: "Low"}, {Value: 100, Label: "High"}}
+		tt := ui.NewTester(func(c *ui.Context) {
+			Use(c, Settings{})
+			ui.Column(c).Width(300).Children(func() {
+				Slider(c, &v, SliderOptions{Marks: marks})
+				RangeSlider(c, &low, &high, RangeSliderOptions{Marks: marks})
+			})
+		}, 320, 200)
+		tt.SetPreferences(ui.Preferences{ReduceMotion: true, TextScale: scale})
+		tt.Frame()
+		return encode(t, tt.Image())
+	}
+	if bytes.Equal(render(1), render(2)) {
+		t.Fatal("mark captions ignore the text scale")
+	}
+}

slider_test.go

@@ -70,18 +70,6 @@ func TestSliderClampsOutOfRangeValue(t *testing.T) {
 	}
 }
 
-func TestSliderDisabled(t *testing.T) {
-	v, changes := 30.0, 0
-	tt := sliderTester(&v, SliderOptions{Disabled: true, Step: 1}, &changes)
-	tt.Key(0, ui.KeyTab)
-	tt.Key(0, ui.KeyRight)
-	tt.Press(100, 18)
-	tt.Release(100, 18)
-	if v != 30 {
-		t.Fatalf("disabled slider moved to %v", v)
-	}
-}
-
 func TestSliderBadRange(t *testing.T) {
 	defer func() {
 		if recover() == nil {

switch.go

@@ -24,13 +24,17 @@ const (
 	switchK float32 = 14
 )
 
-// Switch turns *on over when clicked or with Space. Changed reports the
-// new value; the caller applies it and may set Loading while it does.
+// Switch turns *on over by click or Space; Changed reports it, the caller applies it.
 func Switch(c *ui.Context, on *bool, label string, opts SwitchOptions) *ui.Element {
 	k := Tokens(c)
 	d := Density(c)
-	sw := ui.SwitchBase(c, on).Gap(d.Unit() * 2).AlignItems(ui.Center).MinHeight(theme.MinHitSize).
-		FocusRing(false).Disabled(opts.Disabled || opts.Loading)
+	blocked := opts.Disabled || opts.Loading
+	var sw *ui.Element
+	// Disabled on a wrapper, and a copy, block the base before it takes input.
+	ui.Row(c).Shrink(0).Disabled(blocked).Children(func() {
+		sw = ui.SwitchBase(c, choiceTarget(on, blocked)).Gap(d.Unit() * 2).AlignItems(ui.Center).
+			MinHeight(d.ControlHeight()).FocusRing(false)
+	})
 	if opts.Description != "" {
 		sw.Description(opts.Description)
 	}
@@ -78,6 +82,15 @@ func Switch(c *ui.Context, on *bool, label string, opts SwitchOptions) *ui.Eleme
 	return sw
 }
 
+// choiceTarget is v, or a throwaway copy of it while input is blocked.
+func choiceTarget[T any](v *T, blocked bool) *T {
+	if !blocked {
+		return v
+	}
+	cp := *v
+	return &cp
+}
+
 func switchFloat(b bool) float32 {
 	if b {
 		return 1

toggle.go

@@ -23,7 +23,10 @@ func Toggle(c *ui.Context, on *bool, label string, opts ToggleOptions) *ui.Eleme
 	if label == "" && opts.Label == "" {
 		panic("mujica: Toggle needs a label or Label")
 	}
-	b := ui.ToggleBase(c, on).Disabled(opts.Disabled)
+	var b *ui.Element
+	ui.Row(c).Shrink(0).Disabled(opts.Disabled).Children(func() {
+		b = ui.ToggleBase(c, choiceTarget(on, opts.Disabled))
+	})
 	if b.Changed() {
 		slog.Debug("mujica: toggle changed", "label", label+opts.Label, "on", *on)
 	}

toggle_group.go

@@ -10,8 +10,7 @@ import (
 	"mujicaui/theme"
 )
 
-// ChoiceResult is the element of a choice control and whether its value
-// changed in this frame.
+// ChoiceResult is a choice control's element and whether its value changed this frame.
 type ChoiceResult struct {
 	*ui.Element
 	changed bool
@@ -42,9 +41,7 @@ type ToggleGroupOptions struct {
 	Label string
 }
 
-// ToggleGroup is a joined row of toggles choosing *value: one item, or
-// several with Multiple. Tab enters the group, the arrows move among the
-// items, Space presses one.
+// ToggleGroup is a joined row of toggles choosing one item of *value, or several with Multiple.
 func ToggleGroup[T comparable](c *ui.Context, value *[]T, items []ToggleItem[T], opts ToggleGroupOptions) ChoiceResult {
 	if !opts.Multiple && len(*value) > 1 {
 		panic("mujica: single ToggleGroup holds more than one value")
@@ -67,7 +64,8 @@ func ToggleGroup[T comparable](c *ui.Context, value *[]T, items []ToggleItem[T],
 			on := slices.Contains(*value, it.Value)
 			pressed := on
 			b := ui.ToggleBase(c, &pressed).Disabled(it.Disabled)
-			if b.Changed() && toggleGroupApply(value, it.Value, pressed, opts) {
+			// The base took input before Disabled applied: drop a disabled item's press.
+			if b.Changed() && !it.Disabled && !opts.Disabled && toggleGroupApply(value, it.Value, pressed, opts) {
 				changed = true
 				on = pressed
 			}

toggle_test.go

@@ -42,20 +42,6 @@ func TestToggleIconOnlyNamed(t *testing.T) {
 	}
 }
 
-func TestToggleDisabled(t *testing.T) {
-	on := false
-	tt := ui.NewTester(func(c *ui.Context) {
-		Use(c, Settings{})
-		Toggle(c, &on, "Italic", ToggleOptions{Disabled: true})
-	}, 300, 120)
-	_ = tt.Click("Italic")
-	tt.Key(0, ui.KeyTab)
-	tt.Key(0, ui.KeySpace)
-	if on {
-		t.Fatal("disabled toggle changed")
-	}
-}
-
 func TestToggleNeedsName(t *testing.T) {
 	defer func() {
 		if recover() == nil {

tree_select.go

@@ -59,9 +59,7 @@ type treeSelectRow struct {
 	parent string
 }
 
-// TreeSelect chooses one node, or several with Multiple, from a tree in a
-// popup with search. Up and Down move, Right expands, Left collapses or
-// goes to the parent, Space or Enter chooses; Escape closes.
+// TreeSelect chooses one node, or several with Multiple, from a searchable tree in a popup.
 func TreeSelect(c *ui.Context, selected *[]string, nodes []TreeSelectNode, opts TreeSelectOptions) ChoiceResult {
 	if !opts.Multiple && len(*selected) > 1 {
 		panic("mujica: single TreeSelect holds more than one ID")
@@ -73,6 +71,9 @@ func TreeSelect(c *ui.Context, selected *[]string, nodes []TreeSelectNode, opts
 		tr.Label(opts.Label)
 	}
 	st := *ui.Local(tr, treeSelectKey{}, func() *treeSelectState { return &treeSelectState{expanded: map[string]bool{}} })
+	if opts.Disabled {
+		st.open = false
+	}
 	if tr.Clicked() || (!st.open && tr.Shortcut(0, ui.KeyDown)) {
 		st.open, st.query = !st.open, ""
 	}
@@ -104,10 +105,14 @@ func TreeSelect(c *ui.Context, selected *[]string, nodes []TreeSelectNode, opts
 				selectNote(c, msg(c, "tree_select.no_results"))
 				return
 			}
+			shown := make(map[string]bool, len(rows))
+			for _, r := range rows {
+				shown[r.node.ID] = true
+			}
 			ui.Scroll(c).MaxHeight(300).Padding(4).Children(func() {
 				ui.Column(c).FocusGroup(ui.Vertical).Children(func() {
 					for i, r := range rows {
-						treeSelectRowView(c, st, selected, r, i == 0, opts)
+						treeSelectRowView(c, st, selected, r, i == 0, shown, opts)
 					}
 				})
 			})
@@ -127,7 +132,7 @@ func treeSelectWalk(nodes []TreeSelectNode, fn func(n *TreeSelectNode)) {
 	}
 }
 
-// treeSelectVisible lists the rows to show: expanded ones, or while searching the matches and their ancestors.
+// treeSelectVisible lists the rows to show: expanded ones, or matches and their ancestors.
 func treeSelectVisible(nodes []TreeSelectNode, st *treeSelectState) []treeSelectRow {
 	q := strings.ToLower(strings.TrimSpace(st.query))
 	var rows []treeSelectRow
@@ -155,9 +160,9 @@ func treeSelectVisible(nodes []TreeSelectNode, st *treeSelectState) []treeSelect
 	return rows
 }
 
-// treeSelectCheck returns a node's check state under the rule.
+// treeSelectCheck returns a node's check state: its own in single mode, else by the rule.
 func treeSelectCheck(n *TreeSelectNode, selected []string, opts TreeSelectOptions) internal.CheckState {
-	if opts.Rule == TreeSelectIndependent || len(n.Children) == 0 {
+	if !opts.Multiple || opts.Rule == TreeSelectIndependent || len(n.Children) == 0 {
 		if slices.Contains(selected, n.ID) {
 			return internal.Checked
 		}
@@ -201,14 +206,38 @@ func treeSelectToggle(n *TreeSelectNode, selected []string, on bool, opts TreeSe
 	return selected
 }
 
-func treeSelectRowView(c *ui.Context, st *treeSelectState, selected *[]string, r treeSelectRow, first bool, opts TreeSelectOptions) {
+// treeSelectFirstChild returns the first child of n that shows and is enabled, or "".
+func treeSelectFirstChild(n *TreeSelectNode, shown map[string]bool) string {
+	for _, ch := range n.Children {
+		if shown[ch.ID] && !ch.Disabled {
+			return ch.ID
+		}
+	}
+	return ""
+}
+
+// treeSelectDescribe says what MyGo cannot set on custom rows (ui/element.go:282).
+func treeSelectDescribe(c *ui.Context, b *ui.Element, branch, open bool, state internal.CheckState) {
+	var parts []string
+	if branch {
+		parts = append(parts, msg(c, map[bool]string{true: "tree_select.expanded", false: "tree_select.collapsed"}[open]))
+	}
+	if state == internal.Mixed {
+		parts = append(parts, msg(c, "tree_select.mixed"))
+	}
+	if len(parts) > 0 {
+		b.Description(strings.Join(parts, ", "))
+	}
+}
+
+func treeSelectRowView(c *ui.Context, st *treeSelectState, selected *[]string, r treeSelectRow, first bool, shown map[string]bool, opts TreeSelectOptions) {
 	k := Tokens(c)
 	d := Density(c)
 	n := r.node
 	branch := len(n.Children) > 0
 	open := branch && (st.expanded[n.ID] || strings.TrimSpace(st.query) != "")
 	ui.Row(c).Key(n.ID).AlignItems(ui.Center).Gap(2).Padding(0, 0, 0, float32(r.depth)*18).Children(func() {
-		arrow := ui.Box(c).Size(18, 18).Shrink(0).Radius(theme.ControlRadius)
+		arrow := ui.Box(c).Size(theme.MinHitSize, theme.MinHitSize).Shrink(0).Radius(theme.ControlRadius)
 		if branch {
 			arrow.Role(ui.RoleButton).Label(fmt.Sprintf(msg(c, map[bool]string{true: "tree_select.collapse", false: "tree_select.expand"}[open]), n.Label))
 			if arrow.Clicked() {
@@ -218,6 +247,8 @@ func treeSelectRowView(c *ui.Context, st *treeSelectState, selected *[]string, r
 				arrow.Background(k.SurfaceHover)
 			}
 			arrow.Draw(func(p *ui.Painter, rc ui.Rect) {
+				in := (rc.W - 16) / 2
+				rc = ui.Rect{X: rc.X + in, Y: rc.Y + in, W: 16, H: 16}
 				internal.Mark(p, rc, map[bool]string{true: "chevron-down", false: "chevron-right"}[open], k.TextMuted)
 			})
 		}
@@ -230,20 +261,28 @@ func treeSelectRowView(c *ui.Context, st *treeSelectState, selected *[]string, r
 				*selected = treeSelectToggle(n, *selected, on, opts)
 			}
 		} else {
-			b = ui.ButtonBase(c).Disabled(n.Disabled).MinHeight(d.ControlHeight()-4).Padding(0, d.Unit()*2).
-				Justify(ui.Start).Radius(theme.ControlRadius).Grow(1)
+			chosen := state == internal.Checked
+			ui.Row(c).Grow(1).Disabled(n.Disabled).Children(func() {
+				b = ui.ButtonBase(c).MinHeight(d.ControlHeight()).Padding(0, d.Unit()*2).Gap(d.Unit() * 2).
+					Justify(ui.Start).Radius(theme.ControlRadius).Grow(1)
+			})
 			internal.Ring(b, k.Focus, theme.ControlRadius)
 			if b.Clicked() {
 				*selected, st.open = []string{n.ID}, false
 			}
+			b.Role(ui.RoleTreeItem).Selected(chosen).Background(ui.Transparent).TextColor(k.Text)
 			switch {
-			case state == internal.Checked:
+			case chosen:
 				b.Background(k.Selection).TextColor(k.AccentText)
 			case b.Hovered():
 				b.Background(k.SurfaceHover)
 			}
-			b.Role(ui.RoleTreeItem).Children(func() { ui.Text(c, n.Label).SingleLine() })
+			b.Children(func() {
+				ui.Text(c, n.Label).SingleLine().Grow(1)
+				selectCheck(c, chosen)
+			})
 		}
+		treeSelectDescribe(c, b, branch, open, state)
 		if st.focus == n.ID || first && st.focus == "\x00" {
 			b.Focus()
 			st.focus = ""
@@ -253,7 +292,7 @@ func treeSelectRowView(c *ui.Context, st *treeSelectState, selected *[]string, r
 		case right && branch && !open:
 			st.expanded[n.ID] = true
 		case right && branch:
-			st.focus = n.Children[0].ID
+			st.focus = treeSelectFirstChild(n, shown)
 		case left && open && st.expanded[n.ID]:
 			st.expanded[n.ID] = false
 		case left && r.parent != "":