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theme.go
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theme.go
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package theme
import (
"context"
"fmt"
"image"
"math"
rtrace "runtime/trace"
"honnef.co/go/gotraceui/color"
"honnef.co/go/gotraceui/layout"
"honnef.co/go/gotraceui/widget"
"gioui.org/f32"
"gioui.org/font"
"gioui.org/io/pointer"
"gioui.org/op"
"gioui.org/op/clip"
"gioui.org/text"
"gioui.org/unit"
"gioui.org/x/component"
"gioui.org/x/outlay"
"golang.org/x/exp/slices"
)
type Theme struct {
Shaper *text.Shaper
Palette Palette
TextSize unit.Sp
TextSizeLarge unit.Sp
WindowPadding unit.Dp
WindowBorder unit.Dp
}
type Palette struct {
Background color.Oklch
Foreground color.Oklch
ForegroundDisabled color.Oklch
OpenLink color.Oklch
NavigationLink color.Oklch
Link color.Oklch
PrimarySelection color.Oklch
Border color.Oklch
Popup struct {
TitleForeground color.Oklch
TitleBackground color.Oklch
Background color.Oklch
}
Menu struct {
Background color.Oklch
Selected color.Oklch
Border color.Oklch
Disabled color.Oklch
}
Table struct {
EvenRowBackground color.Oklch
OddRowBackground color.Oklch
HoveredRowBackground color.Oklch
HeaderBackground color.Oklch
Divider color.Oklch
DragHandle color.Oklch
ExpandedBorder color.Oklch
ExpandedBackground color.Oklch
}
}
var DefaultPalette = Palette{
Background: oklch(99.44, 0.027, 106.89),
Foreground: oklch(0, 0, 0),
ForegroundDisabled: oklch(55.21, 0, 0),
NavigationLink: oklch(57.32, 0.235, 29.23),
OpenLink: oklch(45.2, 0.31, 264.05),
Link: oklch(45.2, 0.31, 264.05),
PrimarySelection: oklcha(93.11, 0.101, 108.21, 0.6),
Border: oklch(0, 0, 0),
Popup: struct {
TitleForeground color.Oklch
TitleBackground color.Oklch
Background color.Oklch
}{
TitleForeground: oklch(0, 0, 0),
TitleBackground: oklch(98.82, 0.017, 196.89),
Background: oklch(98.29, 0.029, 145.35),
},
Menu: struct {
Background color.Oklch
Selected color.Oklch
Border color.Oklch
Disabled color.Oklch
}{
Background: oklch(98.82, 0.017, 196.89),
Selected: oklch(89.92, 0.081, 195.81),
Border: oklch(89.92, 0.081, 195.81),
Disabled: oklch(73.8, 0, 0),
},
Table: struct {
EvenRowBackground color.Oklch
OddRowBackground color.Oklch
HoveredRowBackground color.Oklch
HeaderBackground color.Oklch
Divider color.Oklch
DragHandle color.Oklch
ExpandedBorder color.Oklch
ExpandedBackground color.Oklch
}{
EvenRowBackground: oklch(99.44, 0.027, 106.89),
OddRowBackground: oklch(99.44, 0.027, 106.89),
HoveredRowBackground: oklch(95.63, 0.024, 106.84),
HeaderBackground: oklch(96.48, 0.026, 106.88),
Divider: oklch(80.15, 0, 0),
DragHandle: oklch(0, 0, 0),
ExpandedBorder: oklch(80.15, 0, 0),
ExpandedBackground: oklch(88.63, 0.053, 346),
},
}
func NewTheme(fontCollection []font.FontFace) *Theme {
return &Theme{
Palette: DefaultPalette,
Shaper: text.NewShaper(text.WithCollection(fontCollection), text.NoSystemFonts()),
TextSize: 12,
TextSizeLarge: 14,
WindowPadding: 2,
WindowBorder: 1,
}
}
type ProgressBarStyle struct {
ForegroundColor color.Oklch
BackgroundColor color.Oklch
BorderWidth unit.Dp
Progress float32
}
func ProgressBar(th *Theme, progress float32) ProgressBarStyle {
return ProgressBarStyle{
ForegroundColor: oklch(56.7, 0.118, 143.83),
BackgroundColor: oklcha(0, 0, 0, 0),
BorderWidth: 1,
Progress: progress,
}
}
func (p ProgressBarStyle) Layout(win *Window, gtx layout.Context) layout.Dimensions {
defer rtrace.StartRegion(context.Background(), "theme.ProgressBarStyle.Layout").End()
return Border{
Color: p.ForegroundColor,
Width: p.BorderWidth,
}.Layout(win, gtx, func(win *Window, gtx layout.Context) layout.Dimensions {
// Draw background
bg := clip.Rect{Max: gtx.Constraints.Min}.Op()
FillShape(win, gtx.Ops, p.BackgroundColor, bg)
// Draw foreground
fg := frect{Max: f32.Pt(float32(gtx.Constraints.Min.X)*p.Progress, float32(gtx.Constraints.Min.Y))}.Op(gtx.Ops)
FillShape(win, gtx.Ops, p.ForegroundColor, fg)
return layout.Dimensions{
Size: gtx.Constraints.Min,
}
})
}
type CheckBoxStyle struct {
Checkbox widget.Boolean
Label string
TextSize unit.Sp
ForegroundColor color.Oklch
BackgroundColor color.Oklch
TextColor color.Oklch
}
func CheckBox(th *Theme, checkbox widget.Boolean, label string) CheckBoxStyle {
return CheckBoxStyle{
Checkbox: checkbox,
Label: label,
TextColor: th.Palette.Foreground,
ForegroundColor: th.Palette.Foreground,
BackgroundColor: oklcha(0, 0, 0, 0),
TextSize: th.TextSize,
}
}
func (c CheckBoxStyle) Layout(win *Window, gtx layout.Context) layout.Dimensions {
defer rtrace.StartRegion(context.Background(), "theme.CheckBoxStyle.Layout").End()
return c.Checkbox.Layout(gtx, func(gtx layout.Context) layout.Dimensions {
return layout.Rigids(gtx, layout.Horizontal,
func(gtx layout.Context) layout.Dimensions {
sizeDp := gtx.Metric.SpToDp(c.TextSize)
sizePx := gtx.Dp(sizeDp)
ngtx := gtx
ngtx.Constraints = layout.Exact(image.Pt(sizePx, sizePx))
return Border{
Color: c.ForegroundColor,
Width: 1,
}.Layout(win, ngtx, func(win *Window, gtx layout.Context) layout.Dimensions {
FillShape(win, gtx.Ops, c.BackgroundColor, clip.Rect{Max: gtx.Constraints.Min}.Op())
if c.Checkbox.Get() {
padding := gtx.Constraints.Min.X / 4
if padding == 0 {
padding = gtx.Dp(1)
}
minx := padding
miny := minx
maxx := gtx.Constraints.Min.X - padding
maxy := maxx
FillShape(win, gtx.Ops, c.ForegroundColor, clip.Rect{Min: image.Pt(minx, miny), Max: image.Pt(maxx, maxy)}.Op())
}
return layout.Dimensions{Size: gtx.Constraints.Min}
})
},
layout.Spacer{Width: 3}.Layout,
func(gtx layout.Context) layout.Dimensions {
return widget.Label{MaxLines: 1}.Layout(gtx, win.Theme.Shaper, font.Font{}, c.TextSize, c.Label, win.ColorMaterial(gtx, c.TextColor))
},
)
})
}
type CheckBoxGroupStyle struct {
Clickable *widget.Clickable
Label string
TextSize unit.Sp
ForegroundColor color.Oklch
BackgroundColor color.Oklch
TextColor color.Oklch
}
func CheckBoxGroup(th *Theme, clickable *widget.Clickable, label string) CheckBoxGroupStyle {
return CheckBoxGroupStyle{
Clickable: clickable,
Label: label,
TextColor: th.Palette.Foreground,
ForegroundColor: th.Palette.Foreground,
BackgroundColor: oklcha(0, 0, 0, 0),
TextSize: th.TextSize,
}
}
func (chkgrp CheckBoxGroupStyle) Layout(win *Window, gtx layout.Context, checkboxes ...CheckBoxStyle) layout.Dimensions {
defer rtrace.StartRegion(context.Background(), "theme.CheckBoxGroupStyle.Layout").End()
const (
none = iota
noneThenSome
some
all
)
sm := [...][2]int{
none: {0: noneThenSome, 1: all},
all: {0: some, 1: all},
some: {0: some, 1: some},
noneThenSome: {0: noneThenSome, 1: some},
}
var state int
for i := range checkboxes {
chk := &checkboxes[i]
var b int
if chk.Checkbox.Update(gtx) {
b = 1
}
state = sm[state][b]
if state == some {
break
}
}
if state == noneThenSome {
state = none
}
for {
click, ok := chkgrp.Clickable.Clicked(gtx)
if !ok {
break
}
if click.Button != pointer.ButtonPrimary {
continue
}
for i := range checkboxes {
checkboxes[i].Checkbox.Set(state == none || state == some)
}
if state == none || state == some {
state = all
} else {
state = none
}
}
sizeDp := gtx.Metric.SpToDp(chkgrp.TextSize)
sizePx := gtx.Dp(sizeDp)
dims := layout.Rigids(gtx, layout.Vertical,
func(gtx layout.Context) layout.Dimensions {
return chkgrp.Clickable.Layout(gtx, func(gtx layout.Context) layout.Dimensions {
return layout.Rigids(gtx, layout.Horizontal,
func(gtx layout.Context) layout.Dimensions {
ngtx := gtx
ngtx.Constraints = layout.Exact(image.Pt(sizePx, sizePx))
return Border{
Color: chkgrp.ForegroundColor,
Width: 1,
}.Layout(win, ngtx, func(win *Window, gtx layout.Context) layout.Dimensions {
FillShape(win, gtx.Ops, chkgrp.BackgroundColor, clip.Rect{Max: gtx.Constraints.Min}.Op())
switch state {
case none:
case some:
padding := gtx.Constraints.Min.X / 4
if padding == 0 {
padding = gtx.Dp(1)
}
minx := padding
maxx := gtx.Constraints.Min.X - padding
miny := minx + padding/2
maxy := maxx - padding/2
FillShape(win, gtx.Ops, chkgrp.ForegroundColor, clip.Rect{Min: image.Pt(minx, miny), Max: image.Pt(maxx, maxy)}.Op())
case all:
padding := gtx.Constraints.Min.X / 4
if padding == 0 {
padding = gtx.Dp(1)
}
minx := padding
miny := minx
maxx := gtx.Constraints.Min.X - padding
maxy := maxx
FillShape(win, gtx.Ops, chkgrp.ForegroundColor, clip.Rect{Min: image.Pt(minx, miny), Max: image.Pt(maxx, maxy)}.Op())
}
return layout.Dimensions{Size: gtx.Constraints.Min}
})
},
layout.Spacer{Width: 3}.Layout,
func(gtx layout.Context) layout.Dimensions {
return widget.Label{MaxLines: 1}.Layout(gtx, win.Theme.Shaper, font.Font{}, chkgrp.TextSize, chkgrp.Label, win.ColorMaterial(gtx, chkgrp.TextColor))
},
)
})
},
func(gtx layout.Context) layout.Dimensions {
var children []layout.Widget
if len(checkboxes) <= 16 {
// Specifying a constant capacity allows the slice to be stack-allocated.
children = make([]layout.Widget, len(checkboxes), 16)
} else {
children = make([]layout.Widget, len(checkboxes))
}
for i := range checkboxes {
children[i] = Dumb(win, checkboxes[i].Layout)
}
return layout.Inset{Left: sizeDp + 3}.Layout(gtx, func(gtx layout.Context) layout.Dimensions {
return layout.Rigids(gtx, layout.Vertical, children...)
})
},
)
return dims
}
// oklch specifies a color in Oklch.
// 100 >= l >= 0
// 0.37 >= c >= 0
// 360 > h >= 0
func oklch(l, c, h float32) color.Oklch {
return color.Oklch{L: l / 100, C: c, H: h, A: 1}
}
func oklcha(l, c, h, a float32) color.Oklch {
return color.Oklch{L: l / 100, C: c, H: h, A: a}
}
type frect struct {
Min f32.Point
Max f32.Point
}
func (r frect) Path(ops *op.Ops) clip.PathSpec {
var p clip.Path
p.Begin(ops)
r.IntoPath(&p)
return p.End()
}
func (r frect) IntoPath(p *clip.Path) {
p.MoveTo(r.Min)
p.LineTo(f32.Pt(r.Max.X, r.Min.Y))
p.LineTo(r.Max)
p.LineTo(f32.Pt(r.Min.X, r.Max.Y))
p.LineTo(r.Min)
}
func (r frect) Op(ops *op.Ops) clip.Op {
return clip.Outline{Path: r.Path(ops)}.Op()
}
// clamp1 limits v to range [0..1].
func clamp1(v float32) float32 {
if v >= 1 {
return 1
} else if v <= 0 {
return 0
} else {
return v
}
}
type FoldableStyle struct {
Title string
Closed *widget.Bool
TextSize unit.Sp
TextColor color.Oklch
}
func Foldable(th *Theme, b *widget.Bool, title string) FoldableStyle {
return FoldableStyle{
Closed: b,
Title: title,
TextSize: th.TextSize,
TextColor: th.Palette.Foreground,
}
}
func (f FoldableStyle) Layout(win *Window, gtx layout.Context, contents Widget) layout.Dimensions {
defer rtrace.StartRegion(context.Background(), "theme.Foldable.Layout").End()
var size image.Point
dims := f.Closed.Layout(gtx, func(gtx layout.Context) layout.Dimensions {
// TODO(dh): show an icon indicating state of the foldable. We tried using ▶ and ▼ but the Go font only has ▼…
var l string
if f.Closed.Value {
l = "[C] " + f.Title
} else {
l = "[O] " + f.Title
}
gtx.Constraints.Min.Y = 0
pointer.CursorPointer.Add(gtx.Ops)
return widget.Label{MaxLines: 1}.Layout(gtx, win.Theme.Shaper, font.Font{Weight: font.Bold}, f.TextSize, l, win.ColorMaterial(gtx, f.TextColor))
})
size = dims.Size
if !f.Closed.Value {
gtx := gtx
defer op.Offset(image.Pt(0, size.Y)).Push(gtx.Ops).Pop()
gtx.Constraints.Max.Y -= size.Y
dims := contents(win, gtx)
max := func(a, b int) int {
if a >= b {
return a
} else {
return b
}
}
size.X = max(size.X, dims.Size.X)
size.Y += dims.Size.Y
}
size = gtx.Constraints.Constrain(size)
return layout.Dimensions{Size: size}
}
type TooltipStyle struct {
Message string
Padding unit.Dp
BorderSize unit.Dp
BorderColor color.Oklch
TextSize unit.Sp
TextColor color.Oklch
BackgroundColor color.Oklch
}
func Tooltip(th *Theme, msg string) TooltipStyle {
return TooltipStyle{
Message: msg,
BorderSize: th.WindowBorder,
BorderColor: th.Palette.Border,
Padding: th.WindowPadding,
TextSize: th.TextSize,
TextColor: th.Palette.Foreground,
BackgroundColor: th.Palette.Popup.Background,
}
}
func (tt TooltipStyle) Layout(win *Window, gtx layout.Context) layout.Dimensions {
defer rtrace.StartRegion(context.Background(), "theme.Tooltip.Layout").End()
return BorderedTextStyle{
Text: tt.Message,
Padding: tt.Padding,
BorderSize: tt.BorderSize,
BorderColor: tt.BorderColor,
TextSize: tt.TextSize,
TextColor: tt.TextColor,
BackgroundColor: tt.BackgroundColor,
}.Layout(win, gtx)
}
type BorderedTextStyle struct {
Text string
Padding unit.Dp
BorderSize unit.Dp
BorderColor color.Oklch
TextSize unit.Sp
TextColor color.Oklch
BackgroundColor color.Oklch
}
func BorderedText(th *Theme, s string) BorderedTextStyle {
return BorderedTextStyle{
Text: s,
BorderSize: th.WindowBorder,
BorderColor: th.Palette.Border,
Padding: th.WindowPadding,
TextSize: th.TextSize,
TextColor: th.Palette.Foreground,
BackgroundColor: th.Palette.Popup.Background,
}
}
func (bt BorderedTextStyle) Layout(win *Window, gtx layout.Context) layout.Dimensions {
defer rtrace.StartRegion(context.Background(), "theme.BorderedTextStyle.Layout").End()
return Bordered{Color: bt.BorderColor, Width: bt.BorderSize}.Layout(win, gtx, func(win *Window, gtx layout.Context) layout.Dimensions {
defer clip.Rect{Max: gtx.Constraints.Max}.Push(gtx.Ops).Pop()
// Don't inherit the minimum constraint from the parent widget. In this specific case, this widget is being
// rendered as part of a flex child.
gtx.Constraints.Min = image.Pt(0, 0)
var padding = gtx.Dp(bt.Padding)
macro := op.Record(gtx.Ops)
dims := widget.Label{}.Layout(gtx, win.Theme.Shaper, font.Font{}, bt.TextSize, bt.Text, win.ColorMaterial(gtx, bt.TextColor))
call := macro.Stop()
total := clip.Rect{
Min: image.Pt(0, 0),
Max: image.Pt(dims.Size.X+2*padding, dims.Size.Y+2*padding),
}
FillShape(win, gtx.Ops, bt.BackgroundColor, total.Op())
stack := op.Offset(image.Pt(padding, padding)).Push(gtx.Ops)
call.Add(gtx.Ops)
stack.Pop()
return layout.Dimensions{
Baseline: dims.Baseline,
Size: total.Max,
}
})
}
type ButtonStyle struct {
Text string
Button *widget.Clickable
ActiveBackgroundColor color.Oklch
BackgroundColor color.Oklch
BorderColor color.Oklch
TextColor color.Oklch
TextColorDisabled color.Oklch
}
func Button(th *Theme, button *widget.Clickable, txt string) ButtonStyle {
return ButtonStyle{
Text: txt,
Button: button,
ActiveBackgroundColor: oklch(90.81, 0.046, 285.44),
BackgroundColor: oklch(100, 0, 0),
BorderColor: th.Palette.Border,
TextColor: th.Palette.Foreground,
TextColorDisabled: th.Palette.ForegroundDisabled,
}
}
func (b ButtonStyle) Layout(win *Window, gtx layout.Context) layout.Dimensions {
defer rtrace.StartRegion(context.Background(), "theme.ButtonStyle.Layout").End()
var bg color.Oklch
if b.Button.Pressed(pointer.ButtonPrimary) {
bg = b.ActiveBackgroundColor
} else {
bg = b.BackgroundColor
}
var fg color.Oklch
if gtx.Queue != nil {
fg = b.TextColor
} else {
fg = b.TextColorDisabled
}
return Background{Color: bg}.Layout(win, gtx, func(win *Window, gtx layout.Context) layout.Dimensions {
return b.Button.Layout(gtx, func(gtx layout.Context) layout.Dimensions {
return Bordered{Color: b.BorderColor, Width: 1}.Layout(win, gtx, func(win *Window, gtx layout.Context) layout.Dimensions {
return layout.UniformInset(1).Layout(gtx, func(gtx layout.Context) layout.Dimensions {
return widget.Label{Alignment: text.Middle}.Layout(gtx, win.Theme.Shaper, font.Font{}, 12, b.Text, win.ColorMaterial(gtx, fg))
})
})
})
})
}
type GridStyle struct {
State *component.GridState
VScrollbarStyle ScrollbarStyle
HScrollbarStyle ScrollbarStyle
// material.AnchorStrategy
}
// Grid makes a grid with its persistent state.
func Grid(th *Theme, state *component.GridState) GridStyle {
return GridStyle{
State: state,
VScrollbarStyle: Scrollbar(th, &state.VScrollbar),
HScrollbarStyle: Scrollbar(th, &state.HScrollbar),
}
}
// Layout will draw a grid, using fixed column widths and row height.
func (g GridStyle) Layout(win *Window, gtx layout.Context, rows, cols int, dimensioner outlay.Dimensioner, cellFunc outlay.Cell) layout.Dimensions {
defer rtrace.StartRegion(context.Background(), "theme.GridStyle.Layout").End()
// Determine how much space the scrollbars occupy when present.
hBarWidth := gtx.Dp(g.HScrollbarStyle.Width())
vBarWidth := gtx.Dp(g.VScrollbarStyle.Width())
// Reserve space for the scrollbars using the gtx constraints.
gtx.Constraints.Max.X -= vBarWidth
gtx.Constraints.Max.Y -= hBarWidth
gtx.Constraints = layout.Normalize(gtx.Constraints)
defer pointer.PassOp{}.Push(gtx.Ops).Pop()
// Draw grid.
dim := g.State.Grid.Layout(gtx, rows, cols, dimensioner, cellFunc)
// Calculate column widths in pixels. Width is sum of widths.
totalWidth := g.State.Horizontal.Length
totalHeight := g.State.Vertical.Length
// Make the scroll bar stick to the grid.
if gtx.Constraints.Max.X > dim.Size.X {
gtx.Constraints.Max.X = dim.Size.X
gtx.Constraints.Max.X += vBarWidth
}
// Get horizontal scroll info.
delta := g.HScrollbarStyle.Scrollbar.ScrollDistance()
if delta != 0 {
g.State.Horizontal.Offset += int(float32(totalWidth-vBarWidth) * delta)
}
// Get vertical scroll info.
delta = g.VScrollbarStyle.Scrollbar.ScrollDistance()
if delta != 0 {
g.State.Vertical.Offset += int(math.Round(float64(float32(totalHeight-hBarWidth) * delta)))
}
var start float32
var end float32
// Draw vertical scroll-bar.
if vBarWidth > 0 {
c := gtx
start = float32(g.State.Vertical.OffsetAbs) / float32(totalHeight)
end = start + float32(c.Constraints.Max.Y)/float32(totalHeight)
c.Constraints.Min = c.Constraints.Max
c.Constraints.Min.X += vBarWidth
layout.E.Layout(c, func(gtx layout.Context) layout.Dimensions {
return g.VScrollbarStyle.Layout(win, gtx, layout.Vertical, start, end)
})
}
// Draw horizontal scroll-bar if it is visible.
if hBarWidth > 0 {
c := gtx
start = float32(g.State.Horizontal.OffsetAbs) / float32(totalWidth)
end = start + float32(c.Constraints.Max.X)/float32(totalWidth)
c.Constraints.Min = c.Constraints.Max
c.Constraints.Min.Y += hBarWidth
layout.S.Layout(c, func(gtx layout.Context) layout.Dimensions {
return g.HScrollbarStyle.Layout(win, gtx, layout.Horizontal, start, end)
})
}
dim.Size.Y += hBarWidth
return dim
}
type ResizeStyle struct {
res *component.Resize
BorderColor color.Oklch
}
func Resize(th *Theme, state *component.Resize) ResizeStyle {
return ResizeStyle{
res: state,
BorderColor: th.Palette.Border,
}
}
func (rs ResizeStyle) Layout(win *Window, gtx layout.Context, w1, w2 Widget) layout.Dimensions {
defer rtrace.StartRegion(context.Background(), "theme.ResizeStyle.Layout").End()
var hnd layout.Widget
switch rs.res.Axis {
case layout.Horizontal:
hnd = func(gtx layout.Context) layout.Dimensions {
gtx.Constraints.Max.X = 5
defer clip.Rect{Max: gtx.Constraints.Max}.Push(gtx.Ops).Pop()
Fill(win, gtx.Ops, rs.BorderColor)
return layout.Dimensions{Size: gtx.Constraints.Max}
}
case layout.Vertical:
hnd = func(gtx layout.Context) layout.Dimensions {
gtx.Constraints.Max.Y = 5
defer clip.Rect{Max: gtx.Constraints.Max}.Push(gtx.Ops).Pop()
Fill(win, gtx.Ops, rs.BorderColor)
return layout.Dimensions{Size: gtx.Constraints.Max}
}
default:
panic(fmt.Sprintf("unhandled case %v", rs.res.Axis))
}
return rs.res.Layout(gtx, Dumb(win, w1), Dumb(win, w2), hnd)
}
type SwitchStyle struct {
State widget.Boolean
Left, Right string
}
func Switch(b widget.Boolean, left, right string) SwitchStyle {
return SwitchStyle{State: b, Left: left, Right: right}
}
func (ss SwitchStyle) Layout(win *Window, gtx layout.Context) layout.Dimensions {
defer rtrace.StartRegion(context.Background(), "theme.SwitchStyle.Layout").End()
noMin := func(gtx layout.Context) layout.Context {
gtx.Constraints.Min = image.Point{}
return gtx
}
const padding = 5
const borderWidth = 1
activeForeground := win.ColorMaterial(gtx, oklch(0, 0, 0))
inactiveForeground := win.ColorMaterial(gtx, oklch(36.39, 0, 0))
activeBackground := oklch(90.81, 0.046, 285.44)
inactiveBackground := oklch(100, 0, 0)
activeFont := font.Font{Weight: font.Bold}
inactiveFont := font.Font{}
activeBorder := oklch(77.08, 0.121, 283.20)
inactiveBorder := oklch(79.21, 0, 0)
var (
leftForeground, rightForeground = activeForeground, inactiveForeground
leftBackground, rightBackground = activeBackground, inactiveBackground
leftFont, rightFont = activeFont, inactiveFont
leftBorder, rightBorder = activeBorder, inactiveBorder
)
if ss.State.Get() {
leftForeground, rightForeground = rightForeground, leftForeground
leftBackground, rightBackground = rightBackground, leftBackground
leftFont, rightFont = rightFont, leftFont
leftBorder, rightBorder = rightBorder, leftBorder
}
// Compute the sizes of the labels. We use the active font for both under the assumption that the active font
// results in dimensions >= the inactive font. If we used the actual fonts (one active and one inactive) then the
// overall size might change when toggling the switch.
m := op.Record(gtx.Ops)
dimsLeft := widget.Label{MaxLines: 1}.Layout(noMin(gtx), win.Theme.Shaper, activeFont, 12, ss.Left, leftForeground)
m.Stop()
m = op.Record(gtx.Ops)
dimsRight := widget.Label{MaxLines: 1}.Layout(noMin(gtx), win.Theme.Shaper, activeFont, 12, ss.Right, rightForeground)
m.Stop()
var labelWidth int
if dimsLeft.Size.X >= dimsRight.Size.X {
labelWidth = dimsLeft.Size.X
} else {
labelWidth = dimsRight.Size.X
}
minWidth := 2*labelWidth + 4*gtx.Dp(padding) + gtx.Dp(borderWidth)
gtx.Constraints.Max.X = gtx.Constraints.Constrain(image.Pt(minWidth, 0)).X
// FIXME(dh): the way we "remove" parts of the border by drawing over it assumes that our background colors have no
// transparency.
return ss.State.Layout(gtx, func(gtx layout.Context) layout.Dimensions {
return layout.Flex{Axis: layout.Horizontal}.Layout(gtx,
layout.Flexed(1, func(gtx layout.Context) layout.Dimensions {
dims := Border{Color: leftBorder, Width: borderWidth}.Layout(win, gtx, func(win *Window, gtx layout.Context) layout.Dimensions {
return Background{Color: leftBackground}.Layout(win, gtx, func(win *Window, gtx layout.Context) layout.Dimensions {
return layout.UniformInset(padding).Layout(gtx, func(gtx layout.Context) layout.Dimensions {
defer clip.Rect{Max: gtx.Constraints.Max}.Push(gtx.Ops).Pop()
return layout.Center.Layout(gtx, func(gtx layout.Context) layout.Dimensions {
return widget.Label{MaxLines: 1}.Layout(noMin(gtx), win.Theme.Shaper, leftFont, 12, ss.Left, leftForeground)
})
})
})
})
// Remove right part of the border
FillShape(win, gtx.Ops, leftBackground, clip.Rect{Min: image.Pt(dims.Size.X-gtx.Dp(borderWidth), gtx.Dp(borderWidth)), Max: image.Pt(dims.Size.X, dims.Size.Y-gtx.Dp(borderWidth))}.Op())
return dims
}),
// The left and right buttons share a single border in the middle.
layout.Rigid(func(gtx layout.Context) layout.Dimensions {
width := gtx.Dp(borderWidth)
height := dimsLeft.Size.Y + gtx.Dp(padding)*2
size := image.Pt(width, height)
FillShape(win, gtx.Ops, activeBorder, clip.Rect{Max: size}.Op())
return layout.Dimensions{Size: size}
}),
layout.Flexed(1, func(gtx layout.Context) layout.Dimensions {
dims := Border{Color: rightBorder, Width: borderWidth}.Layout(win, gtx, func(win *Window, gtx layout.Context) layout.Dimensions {
return Background{Color: rightBackground}.Layout(win, gtx, func(win *Window, gtx layout.Context) layout.Dimensions {
return layout.UniformInset(padding).Layout(gtx, func(gtx layout.Context) layout.Dimensions {
defer clip.Rect{Max: gtx.Constraints.Max}.Push(gtx.Ops).Pop()
return layout.Center.Layout(gtx, func(gtx layout.Context) layout.Dimensions {
return widget.Label{MaxLines: 1}.Layout(noMin(gtx), win.Theme.Shaper, rightFont, 12, ss.Right, rightForeground)
})
})
})
})
// Remove left part of the border
FillShape(win, gtx.Ops, rightBackground, clip.Rect{Min: image.Pt(0, gtx.Dp(borderWidth)), Max: image.Pt(gtx.Dp(borderWidth), dims.Size.Y-gtx.Dp(borderWidth))}.Op())
return dims
}),
)
})
}
type TabbedState struct {
Current int
clickables []widget.Clickable
list layout.List
}
type TabClick struct {
Index int
Click widget.Click
}
type TabbedStyle struct {
State *TabbedState
Tabs []string
}
func Tabbed(state *TabbedState, tabs []string) TabbedStyle {
return TabbedStyle{
State: state,
Tabs: tabs,
}
}
func (ts *TabbedState) Update(gtx layout.Context) []TabClick {
var clicked []TabClick
for i := range ts.clickables {
for {
click, ok := ts.clickables[i].Clicked(gtx)
if !ok {
break
}
if click.Modifiers == 0 && click.Button == pointer.ButtonPrimary {
ts.Current = i
} else {
clicked = append(clicked, TabClick{i, click})
}
}
}
return clicked
}
func (ts TabbedStyle) Layout(win *Window, gtx layout.Context, w Widget) layout.Dimensions {
defer rtrace.StartRegion(context.Background(), "theme.TabbedStyle.Layout").End()
ts.State.Update(gtx)
if ts.State.Current >= len(ts.Tabs) {
ts.State.Current = len(ts.Tabs) - 1
}
if len(ts.State.clickables) < len(ts.Tabs) {
ts.State.clickables = slices.Grow(ts.State.clickables, len(ts.Tabs))[:len(ts.Tabs)]
}
const padding = 5
const lineThickness = 1
const activeLineThickness = 3
dims := Background{Color: win.Theme.Palette.Background}.Layout(win, gtx, func(win *Window, gtx layout.Context) layout.Dimensions {
return layout.Rigids(gtx, layout.Vertical,
// Tabs
func(gtx layout.Context) layout.Dimensions {
return ts.State.list.Layout(gtx, len(ts.Tabs), func(gtx layout.Context, i int) layout.Dimensions {
return ts.State.clickables[i].Layout(gtx, func(gtx layout.Context) layout.Dimensions {
stack := op.Offset(image.Pt(gtx.Dp(padding), gtx.Dp(padding))).Push(gtx.Ops)
dims := widget.Label{MaxLines: 1}.Layout(gtx, win.Theme.Shaper, font.Font{Weight: font.Bold}, 12, ts.Tabs[i], win.ColorMaterial(gtx, win.Theme.Palette.Foreground))
stack.Pop()
dims.Size.X += 2 * gtx.Dp(padding)
dims.Size.Y += 2 * gtx.Dp(padding)
if i == ts.State.Current {
x0 := 0
x1 := dims.Size.X
y0 := dims.Size.Y - gtx.Dp(activeLineThickness)
y1 := y0 + gtx.Dp(activeLineThickness)
FillShape(win, gtx.Ops, oklch(71.79, 0.151, 281.92), clip.Rect{Min: image.Pt(x0, y0), Max: image.Pt(x1, y1)}.Op())
}
return dims
})
})
},
// Line
func(gtx layout.Context) layout.Dimensions {
r := clip.Rect{Max: image.Pt(gtx.Constraints.Min.X, gtx.Dp(lineThickness))}
FillShape(win, gtx.Ops, oklch(0, 0, 0), r.Op())
return layout.Dimensions{Size: r.Max}
},
// Padding
func(gtx layout.Context) layout.Dimensions { return layout.Spacer{Height: padding}.Layout(gtx) },
// Content
func(gtx layout.Context) layout.Dimensions {
return w(win, gtx)
},
)
})
return dims
}
type Recording struct {
Call op.CallOp
Dimensions layout.Dimensions
}
func (r Recording) Layout(win *Window, gtx layout.Context) layout.Dimensions {
defer rtrace.StartRegion(context.Background(), "main.Recording.Layout").End()
defer clip.Rect{Max: gtx.Constraints.Max}.Push(gtx.Ops).Pop()
r.Call.Add(gtx.Ops)
return r.Dimensions
}
func Record(win *Window, gtx layout.Context, w Widget) Recording {
m := op.Record(gtx.Ops)
dims := w(win, gtx)
c := m.Stop()
return Recording{c, dims}
}
type LabelStyle struct {
Font font.Font
Color color.Oklch