130 lines
3.6 KiB
Go
130 lines
3.6 KiB
Go
package main
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import (
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"image"
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"image/color"
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"gioui.org/ui"
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"gioui.org/ui/f32"
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"gioui.org/ui/gesture"
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"gioui.org/ui/input"
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"gioui.org/ui/layout"
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"gioui.org/ui/paint"
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"gioui.org/ui/pointer"
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"gioui.org/ui/text"
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)
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var (
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black = color.RGBA{A: 0xff, R: 0, G: 0, B: 0}
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white = color.RGBA{A: 0xff, R: 0xff, G: 0xff, B: 0xff}
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gray = color.RGBA{A: 0xff, R: 0xf0, G: 0xf0, B: 0xf0}
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darkgray = color.RGBA{A: 0xff, R: 0xa0, G: 0xa0, B: 0xa0}
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)
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type Overlay struct {
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Face text.Face
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Text string
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Click gesture.Click
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Color color.RGBA
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Background color.RGBA
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Alignment text.Alignment
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}
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func (b *Overlay) Layout(c ui.Config, ops *ui.Ops, cs layout.Constraints) layout.Dimensions {
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ins := layout.UniformInset(ui.Dp(1))
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cs = ins.Begin(c, ops, cs)
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var dims layout.Dimensions
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st := layout.Stack{}
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st.Init(ops, cs)
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{
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cs = st.Rigid()
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l := text.Label{
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Face: b.Face,
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Text: b.Text,
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Alignment: b.Alignment,
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}
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ins := layout.UniformInset(ui.Dp(4))
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l.Material.Record(ops)
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paint.ColorOp{Color: b.Color}.Add(ops)
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l.Material.Stop()
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dims = ins.End(l.Layout(ops, ins.Begin(c, ops, cs)))
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pointer.RectAreaOp{image.Rect(0, 0, dims.Size.X, dims.Size.Y)}.Add(ops)
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}
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c2 := st.End(dims)
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c1 := st.End(layoutRRect(b.Background, c, ops, st.Expand()))
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dims = st.Layout(c1, c2)
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return ins.End(dims)
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}
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type Button struct {
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Face text.Face
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Label string
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Click gesture.Click
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Color color.RGBA
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Background color.RGBA
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Alignment text.Alignment
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clicked bool
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}
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func layoutRRect(col color.RGBA, c ui.Config, ops *ui.Ops, cs layout.Constraints) layout.Dimensions {
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r := float32(c.Px(ui.Dp(4)))
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sz := image.Point{X: cs.Width.Min, Y: cs.Height.Min}
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w, h := float32(sz.X), float32(sz.Y)
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rrect(ops, w, h, r, r, r, r)
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paint.ColorOp{Color: col}.Add(ops)
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paint.PaintOp{Rect: f32.Rectangle{Max: f32.Point{X: w, Y: h}}}.Add(ops)
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return layout.Dimensions{Size: sz}
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}
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// https://pomax.github.io/bezierinfo/#circles_cubic.
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func rrect(ops *ui.Ops, width, height, se, sw, nw, ne float32) {
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w, h := float32(width), float32(height)
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const c = 0.55228475 // 4*(sqrt(2)-1)/3
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var b paint.PathBuilder
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b.Init(ops)
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b.Move(f32.Point{X: w, Y: h - se})
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b.Cube(f32.Point{X: 0, Y: se * c}, f32.Point{X: -se + se*c, Y: se}, f32.Point{X: -se, Y: se}) // SE
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b.Line(f32.Point{X: sw - w + se, Y: 0})
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b.Cube(f32.Point{X: -sw * c, Y: 0}, f32.Point{X: -sw, Y: -sw + sw*c}, f32.Point{X: -sw, Y: -sw}) // SW
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b.Line(f32.Point{X: 0, Y: nw - h + sw})
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b.Cube(f32.Point{X: 0, Y: -nw * c}, f32.Point{X: nw - nw*c, Y: -nw}, f32.Point{X: nw, Y: -nw}) // NW
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b.Line(f32.Point{X: w - ne - nw, Y: 0})
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b.Cube(f32.Point{X: ne * c, Y: 0}, f32.Point{X: ne, Y: ne - ne*c}, f32.Point{X: ne, Y: ne}) // NE
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b.End()
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}
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func (b *Button) Layout(c ui.Config, q input.Queue, ops *ui.Ops, cs layout.Constraints) layout.Dimensions {
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b.clicked = false
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for ev, ok := b.Click.Next(q); ok; ev, ok = b.Click.Next(q) {
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if ev.Type == gesture.TypeClick {
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b.clicked = true
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}
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}
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ins := layout.UniformInset(ui.Dp(1))
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cs = ins.Begin(c, ops, cs)
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var dims layout.Dimensions
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st := layout.Stack{}
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st.Init(ops, cs)
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{
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cs = st.Rigid()
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l := text.Label{
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Face: b.Face,
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Text: b.Label,
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Alignment: b.Alignment,
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}
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ins := layout.UniformInset(ui.Dp(4))
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//paint.ColorOp{Color: b.Color}.Add(ops)
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dims = ins.End(l.Layout(ops, ins.Begin(c, ops, cs)))
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pointer.RectAreaOp{image.Rect(0, 0, dims.Size.X, dims.Size.Y)}.Add(ops)
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b.Click.Add(ops)
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}
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c2 := st.End(dims)
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c1 := st.End(layoutRRect(b.Background, c, ops, st.Expand()))
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dims = st.Layout(c1, c2)
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return ins.End(dims)
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}
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func (b *Button) Clicked() bool {
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return b.clicked
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}
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